JP4248575B2 - Dust condensing path and vacuum cleaner - Google Patents

Description

  The present invention relates to a dust aggregation path and a vacuum cleaner for aggregating dust by circulating a gas containing dust.

  Conventionally, as an example in which a projection is provided on the inner wall surface of a pipe through which a gas containing dust flows, there is an extension pipe of a vacuum cleaner described in JP-A-2002-320578 (Patent Document 1). The purpose of this is to provide guide vanes as speed increasing means in the vicinity of the entrance of the extension pipe connected to the main body of the vacuum cleaner via a hose to speed up the air flow in the vicinity of the inner wall surface of the extension pipe.

  Japanese Patent Laid-Open No. 9-131522 (Patent Document 2) describes a mixing element that increases the mixing efficiency of fluid. This is intended to increase the mixing efficiency by providing spiral blades integrally with the cylindrical passage tube to give the fluid along the blade surface the action of position movement, merging, and shearing.

  On the other hand, Japanese Unexamined Patent Application Publication No. 2005-324094 (Patent Document 3) describes a particle aggregator that collects fine particles with a conductive material to which a voltage is applied after charging the fine particles using corona discharge. Yes. This is because the particles collected on the surface of the conductive material agglomerate, and when a certain size is reached, the aggregated particles are separated from the conductive material by the air stream and exhausted. It is a vessel.

Japanese Patent No. 2517877 (Patent Document 4) describes that particles are charged by frictional contact charging. This publication describes a method for producing a fine particle composite in which fine particles are charged with positive static electricity on one side and negative static electricity on the other, and then mixed and electrically coupled together. Are listed.
JP 2002-320578 A JP-A-9-131522 JP 2005-324094 A Japanese Patent No. 2517877

  Drawing 1 is a figure showing typically the air current in the inside of a cylindrical pipe like the extension pipe of a vacuum cleaner. As shown in FIG. 1, when the gas P flows into the flow channel 1 in the direction of the arrow, a separation region 3 is formed at a portion where the gas is in contact with the wall 2 of the flow channel 1. For this reason, the velocity of the air flow Q in the flow path becomes uneven depending on the position, and a velocity gradient 4 is generated. The length of the separation region 3 in the direction along the gas flow is about 4 to 5 times the diameter D of the flow path 1.

  As shown in FIG. 1, guide vanes provided on an extension pipe of a vacuum cleaner described in Japanese Patent Laid-Open No. 2002-320578 (Patent Document 1) are used to effectively convey dust to a dust collection chamber. It is intended to suppress the pressure loss reduction by suppressing the separation of the flow passage inlet and increasing the apparent suction port area. However, there is no particular description regarding collision aggregation between particles contained in the airflow.

  In addition, the mixing element described in Japanese Patent Application Laid-Open No. 9-131522 (Patent Document 2) mainly aims to mix fluids, and thus reduces the number of particularly small dusts by colliding and aggregating dusts. Means are not described.

  In the particle aggregator described in Japanese Patent Laid-Open No. 2005-324094 (Patent Document 3), corona discharge is used to charge the particles, and therefore, a high voltage portion is provided in the flow path. In such a case, if an object corresponding to the flow path diameter, particularly a thread-like object, is caught on the high voltage portion, there is a risk of fire or the like due to an electrode short circuit.

  In addition, in the method for producing a fine particle composite described in Japanese Patent No. 2517877 (Patent Document 4), using two pipes, fine particles passing through one tube are positively charged, and fine particles passing through the other tube are After charging with negative static electricity, they merge.

  In order to provide two flow paths in this way, it is necessary to branch one intake port halfway or use two intake ports. However, if one intake port is branched halfway, particulates are likely to accumulate at the branch point. If this is avoided by using two suction ports, the distance between the respective suction ports must be increased, and the occupied area increases and the structure becomes complicated.

  Accordingly, an object of the present invention is to provide a dust aggregating path that has a simple structure and can increase the number of collisions between particles in dust to promote aggregation, thereby reducing the number of particles and increasing the apparent particle diameter. Is to provide.

The dust aggregation path according to the present invention includes a flow path through which a gas flows, a wall forming the flow path, and a protrusion that generates a vortex in the gas flowing through the flow path, and the protrusion passes around the protrusion. It is formed so as to protrude from the inner surface of the wall so as to make the velocity of the gas to be non-uniform, and is arranged in a plurality of directions along the direction in which the gas flows in the flow path and in a plane perpendicular to the direction in which the gas flows. The protrusions are arranged so that at least a part of each protrusion overlaps with the other protrusion when the protrusion is projected from the upstream side to the downstream side of the flow path, and the upstream side of the protrusion located on the downstream side of the airflow It arrange | positions so that an edge part may be located in the upstream rather than the downstream edge part of the protrusion located in an upstream .

The gas that has flowed into the flow path forms vortices so that a non-uniform velocity distribution is given to the gas flow in the vicinity of the wall by the protrusions arranged on the wall of the flow path. As a result, the dust contained in the gas collides with each other and aggregates to form a dust mass (cluster). In the present invention, in order to effectively form vortices, protrusions are formed not only on the part where peeling occurs but also on the part where peeling disappears.

The dust flowing through the dust agglomeration path having the protrusions includes a stage where the dust is guided into the flow path by the air flow, a stage where the dust is conveyed inside the flow path by the air flow where the dust goes straight, and the dust protrudes from the wall of the flow path. A stage in which the dust is circulated by being swirled in a vortex generated downstream of the protrusion, a stage in which a plurality of dust collides with each other due to the vortex, a stage in which the plurality of collided dust forms a dust mass (cluster), and a dust mass Steps are sequentially carried through the road. Further, since a plurality of protrusions are arranged, a large number of vortices can be generated in the flow path, and the effect of dust aggregation can be enhanced.

  In this way, a dust agglomeration path capable of increasing the number of collisions between particles in the dust to promote aggregation, reducing the number of particles and increasing the apparent particle diameter with a simple structure. Can be provided.

Moreover, by doing in this way, the gas which flows along a flow path becomes easy to pass the circumference | surroundings of protrusion, and a vortex can be generated efficiently.

In addition, by doing so, before the vortex strength of the vortex generated from the protrusion located on the upstream side is attenuated due to the frictional resistance due to the viscosity of the gas flowing along the flow path or the frictional resistance with the wall surface, etc. Since it can be made to collide with the vortex generated from the protrusion located on the downstream side, the collision probability of the dust particles can be further improved effectively.

Furthermore, compared to the case where the upstream end portion of the protrusion located on the downstream side of the airflow is not located upstream from the downstream end portion of the protrusion located on the upstream side, the interval between the protrusions is set. Since it can be made shorter, many protrusions can be formed in a short dust aggregation path.

  In the dust aggregation path according to the present invention, the protrusions charge the dust contained in the gas flowing through the flow path positively and the first protrusion that positively charges the dust contained in the gas flowing through the flow path. It is preferable that the first protrusion and the second protrusion be opposed to each other.

  In this way, when the dust is conveyed through the flow path by the air flow, the first protrusion that positively contacts and charges the dust and the second protrusion that negatively charges and charges the dust. A dust lump (cluster) can be formed on dust that is charged with different polarities in contact with the portion or the second protrusion and is charged positively or negatively. Thereby, dust particles (clusters) can be formed by adsorbing positively or negatively charged dust to each other by electrostatic action.

  In the dust collecting path according to the present invention, it is preferable that the protrusion is formed of the same material as the wall.

  By doing so, particles in the dust contained in the gas flowing in the flow path are charged regardless of which of the wall and the protrusion collides, so that the effect of aggregation can be enhanced.

In the dust aggregation path according to the present invention, the protrusion preferably has a height from the wall that is equal to or less than one-eighth of the representative length of the cross section perpendicular to the flow direction of the gas in the flow path.

By doing in this way, it becomes difficult for a foreign material to catch on a protrusion .

In dust aggregation path in accordance with the present invention, the protrusion has a height from the wall, is a quarter or less of the characteristic length of the cross section perpendicular to the direction in which the gas flow path flows, the end face of the projection It is preferable that a rounded portion having a rounded end surface is formed.

By doing in this way, it becomes difficult for a foreign material to catch on a protrusion .

In the dust aggregation path according to the present invention, it is preferable that the protrusion is disposed at a position where there is no contraction in the flow path.

  By doing in this way, the effect of vortex generation can be enhanced.

In the dust aggregation path according to the present invention, it is preferable that the protrusion is disposed in the flow path at a position that is separated from the inlet of the flow path by a distance that is four times the representative length of the cross section of the flow path.

By doing in this way, a processus | protrusion can be arrange | positioned in the position without a contraction flow. Therefore, the effect of vortex generation by the protrusion can be enhanced.

In the dust aggregation path according to the present invention, it is preferable that a rounded portion having a rounded end surface is formed on the inlet end surface of the flow path, and the protrusion is disposed in the vicinity of the inlet of the flow path.

By forming a rounded portion on the inlet end face of the flow path, the contracted flow generated in the flow path is reduced, so even if the protrusions are arranged near the inlet, the effect of vortex generation is less affected by the contracted flow. Become.

  The vacuum cleaner according to the present invention has an electric blower, a ventilation path communicating from the suction port to the electric blower, and a dust collecting part, and sucks dust from the suction port by an air flow generated by the electric blower, In the electric vacuum cleaner that collects dust passing through the road in the dust collecting section, it is preferable that the ventilation path has any one of the above-described dust aggregation paths.

  By doing in this way, in the ventilation path of a vacuum cleaner, the attracted dust can be aggregated and a dust lump (cluster) can be formed. By appropriately growing the dust mass, the mass of the dust mass can be increased and the cluster can be enlarged. By increasing the mass of the dust mass, for example, a cyclone cleaner can collect the dust mass by centrifugation. Further, in the filter type vacuum cleaner, the dust mass can be made larger than the eyes of the filter, so that it is possible to collect dust even with a filter having a large eye. In either case, pressure loss is unlikely to occur in the intake air, so that the dust absorption power (work rate) of the vacuum cleaner body is less likely to decrease.

  As described above, according to the present invention, with a simple structure, it is possible to increase the number of collisions between particles in dust to promote aggregation, reduce the number of particles, and increase the apparent particle size. A dust aggregation path can be provided.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 2 is a diagram schematically showing how particles aggregate when the airflow in the flow channel has a laminar flow velocity distribution.

  As shown in FIG. 2, the gas P flows into the flow path 1 in the direction of the arrow. When the air flow Q in the flow channel 1 is a laminar flow, a velocity difference is generated in the air flow Q due to the friction of the inner surface of the wall 2 of the flow channel 1 and the viscosity of the gas flowing through the inside, and the velocity gradient of the boundary layer 4 develops. The dust 5a that has flowed into the flow path 1 together with the gas P and the dust 5b that has flowed into the flow path 1 later than the dust 5a are separated from each other by the speed difference generated in the air flow Q. As shown, the particles come into contact with each other and aggregate.

  When the flow in the flow path 1 is turbulent, in addition to the non-uniform velocity distribution of the turbulent flow, the particles followability with respect to temporal fluctuations in the turbulent velocity varies depending on the inertial force of the particles. Aggregate. The non-uniform velocity distribution of the turbulent flow is considered to be caused by the partial occurrence of the same phenomenon as in the laminar flow.

  In any case, since the shear of the flow is dominant in the mechanism of increasing the contact probability between the particles in the dust, it is possible to promote the aggregation of the particles by positively giving the velocity distribution to the air flow. it can.

  However, when the flow path is a laminar flow, the magnitude and direction of the force that the velocity distribution exerts on the particles differ depending on the size of the particle diameter. Therefore, particles of various sizes are not uniformly distributed in the flow path, and the distribution can be biased depending on the particle diameter. Such particle size distribution in the flow path affects the contact probability between particles. This will be described below.

  FIG. 3 is a schematic diagram showing the effect of particles having a large diameter on the velocity gradient when the airflow in the flow channel has a laminar velocity distribution.

  As shown in FIG. 3, since the velocity of the air flow Q is high near the center of the flow path 1, the drag generated on the particles 5 is also large. On the other hand, the closer to the wall 2 of the flow channel 1, the smaller the velocity of the air flow Q, and the smaller the drag generated on the particles 5. When the diameter of the particles 5 in the dust flowing into the flow path 1 together with the gas P is large, the particles 5 are strongly influenced by the velocity gradient 4 generated in the flow path 1. That is, since the drag acting on the center side of the particle 5 is large and the drag acting on the wall side of the particle 5 is small, the particle 5 has a difference in drag between the center portion and the wall side. A rotational force is applied from the center toward the wall surface. As a result, the particles 5 move in the direction V, that is, in the direction of the wall 2 of the flow path 1. As a result, particles having a large diameter gather on the wall 2 side of the flow channel 1.

  FIG. 4 is a schematic diagram showing the influence of particles having a small diameter on the velocity gradient when the airflow in the flow channel has a laminar velocity distribution.

  As shown in FIG. 4, when the diameter of the particle 5 is small, there is not much difference in velocity in the airflow Q around the particle 5. Therefore, the influence of the velocity gradient 4 generated in the flow channel 1 acting on the particles 5 is weak, and the particles 5 go straight in the direction V without changing the position when flowing into the flow channel 1. Therefore, particles having a relatively small diameter gather at the center of the flow path 1.

  As a result, the probability that particles having a small diameter in the central portion of the flow channel 1 are in contact with each other is low. Further, since particles having different diameters are separated, such as particles having a small diameter at the center of the flow path 1 and particles having a large diameter near the wall 2 of the flow path 1, the diameter having a large surface area is separated. The probability that particles having a small diameter come into contact with particles having a large diameter is also reduced, and the probability of contact between particles as a whole decreases.

  From the above, it can be said that the following three points are important for improving the aggregation efficiency of particles.

(1) Form a turbulent velocity field.

(2) Give speed distribution positively.

(3) Make the particle size distribution uniform.

  In order to satisfy all of these simultaneously, it is conceivable to provide means for generating turbulence in the air flow, that is, vortex generating means in the flow path.

  On the other hand, when the particles collide, the collided particles are considered to aggregate due to the force generated between the particles. Since this force is generally inversely proportional to the power of the interparticle distance, it is considered that the value becomes very large as the interparticle distance decreases. Therefore, in order to disperse the agglomeration of the particles once contacted, it is considered that an external force greater than the force generated at the time of particle collision is required, so that it is considered that the agglomerated state is maintained.

  Furthermore, since the above force acts as a larger attractive force as the particles become larger, dispersion of the small diameter particles in contact with the large diameter particles is less likely to occur.

  In addition, when the particles are aggregated, apparently large-diameter particles increase, so that the probability of contact between the particles further increases.

  Based on such considerations, embodiments of the present invention will be described below.

(First embodiment)
FIG. 5 is a diagram showing a dust aggregation path according to the first embodiment of the present invention.

  As shown in FIG. 5, the dust aggregation path 10 includes a flow path 11, a wall 12, and a swivel unit 13 as a vortex generating means. The channel 11 is formed by a cylindrical wall 12. Air and other fluids containing aggregated particles (dust and other fine particles) circulate in the flow path 11 by driving a driving source (not shown) (for example, a fan or a blower).

  FIG. 6 is a view showing the front of the dust aggregation path of the first embodiment of the present invention.

  As shown in FIGS. 5 and 6, the swivel unit 13 includes four surfaces, a surface 13 a, a surface 13 b, a surface 13 c, and a surface 13 d, as the wall portion of the swivel unit 13. The surface 13a, the surface 13b, the surface 13c, and the surface 13d are arranged at intervals of 90 ° counterclockwise when viewed from the upstream side of the flow path 1. The respective surfaces are formed perpendicularly from the inner surface of the wall 12 and are connected to each other at the center of the flow path 11, and the swivel portion 13 viewed from the front is a cross shape. A space defined by two adjacent surfaces of the swivel unit 13 and the inner surface of the wall 12 forms the flow path 11.

  Each surface (13a, 13b, 13c, 13d) of the swivel unit 13 is configured such that the twist angle of the cross-shaped cross section gradually increases from the upstream to the downstream of the flow.

  Also, let D be the representative length of the channel width in the plane perpendicular to the flow direction of the swivel unit 13 (the length of one side of the channel in the case of a square channel, the diameter of the channel in the case of a circular channel). The twist angle of the cross-shaped cross section rotates 1/4 in the clockwise direction (90 ° rotation) while proceeding by the distance D in the flow direction. In this embodiment, the swirl direction of the airflow is clockwise as viewed from the upstream side, but the swirl direction of the airflow may be either clockwise or counterclockwise.

  FIG. 7 is a view showing a side cross section of the dust aggregation path of the first embodiment of the present invention. The gas flows into the channel from the left side of the figure.

  As shown in FIG. 7, with respect to the direction along the flow path 11, the flow path 11 has three sections: an inflow portion X, a run-up section Y, and a turning section Z. Further, the length of the swivel unit 13 in the flow direction is set to 2D (twice the representative length of the channel width).

  The gas that has flowed into the flow path 11 first passes through the inflow portion X. The inflow portion X is a section for allowing the airflow to flow into the swivel portion 13 with a low resistance. Next, the gas passes through the run-up section Y.

  The run-up section Y is a section in which the airflow that has flowed into the swivel unit 13 is stably attached to the wall 12 and the surfaces (13a, 13b, 13c, 13d) and suppresses a rapid change. Thereafter, the gas passes through the turning zone Z. The turning section Z is a section for applying a shearing force to the airflow. The twist angle of the cross-shaped cross section of the swirl zone Z gradually increases from the upstream to the downstream of the flow. Since the moving distance increases as the gas approaches the wall 12, the turning force applied increases.

  FIG. 8 is a diagram schematically showing the state of vortices generated by the swivel unit of the first embodiment of the present invention. FIG. 8A is a view of the flow path as viewed from the front, and FIG. 8B is a view of the flow path as viewed from the side.

  As shown in FIG. 8, the gas P that has flowed into the swivel unit 13 travels along the shape of the swirl zone Z so as to swirl in the direction of the arrow in the entire flow path 11 as indicated by a two-dot chain line.

  As described above, since the particles flowing into the swirl zone Z can be continuously applied with the shearing force of the flow, the strength of the vortex generated downstream can be maximized. Since the collision probability of the particles contained in the gas in the flow path 11 is greatly affected by the shear force of the flow, the flow shear force is continuously applied in this way to maximize the strength of the vortex generated downstream. Can effectively increase the contact probability between particles. Furthermore, since a larger velocity gradient is formed in the vicinity of the wall 12, the collision probability between particles is the highest in the vicinity of the wall 12.

  According to the swivel unit 13 of the first embodiment, the swirl section Z can form a swirl that swirls greatly over the entire radial direction in the flow path 11. Therefore, centrifugal force can be applied to the particles flowing in the central portion of the flow path 11, so that the particles can be diffused to the wall 12 side and separated into the central portion of the flow path 11 and the vicinity of the wall 12. Particles of different diameters can be mixed.

  In this way, it becomes possible to make small particles collide with particles having a large surface area, and the contact probability between particles can be dramatically increased.

  By doing so, the gas flowing in the flow path 11 and the dust contained in the gas are conveyed through the flow path 11 by the stage in which the dust is guided into the flow path 11 by the air flow and the air flow in which the dust goes straight. Stage (inflow part X), stage where dust flows along the wall 12 of the flow path 11 (running section Y), stage where dust collides with the swivel part 13 protruding from the wall 12 of the flow path 11 ( Swirl zone Z), a stage in which dust is engulfed and circulated in a swirl generated downstream of swirl unit 13 (swirl section Z), and a stage in which dust collides with the wall surface of the flow path several times by swirl (swirl section Z). A stage in which a plurality of dusts collide with each other by a vortex (downstream part in the swirl zone Z), a stage in which the plurality of collided dusts form a dust lump (cluster), and a dust Lumps are transported inside the channel by airflow And step (downstream of the turning section Z and the turning section Z) which sequentially go through.

  As described above, the dust aggregation path 10 includes the flow path 11 through which the gas flows, the wall 12 that forms the flow path 11, and the vortex generation means that generates a vortex in the gas flowing through the flow path 11. The means is disposed on the inner surface of the wall 12, and the vortex generating means includes a swivel portion 13 having a wall portion protruding into the flow channel 11 from the inner surface of the wall 12 so as to swirl the gas flow in the flow channel 11. Thus, it is possible to provide a dust aggregation path that can increase the number of collisions of particles in dust and promote aggregation, reduce the number of particles, and increase the apparent particle diameter with a simple structure. .

  Further, when the turbulence generation part of the present embodiment is viewed from another point of view, the inside of the flow path 11 is divided into planes (13a, 13b, 13c, 13d), and apparently separated by the planes. It is considered that small flow paths are formed and the respective small flow paths are arranged at the shortest distance from each other. In other words, a plurality of small flow paths are formed in a bundle.

  Thus, in the dust aggregation path 10, the surface is formed from a plurality of surfaces (13a, 13b, 13c, 13d), and the plurality of flow paths 11 are formed by the plurality of surfaces (13a, 13b, 13c, 13d). Divided into independent small channels, the small channels are formed by twisting along the gas flow so as to swirl the gas flow.

  By doing in this way, compared with the case where a flow path is not divided | segmented into a small flow path, the influence of the shear force which gas receives from a wall surface becomes large, and it is possible to raise the cohesion force of dust. Further, the swirling flows formed in the respective small flow paths collide with each other on the downstream side of the small flow path terminal portion, and as a result, the particles taken into the swirling flow can be efficiently collided with each other.

  In the dust aggregation path 10, the torsion angle of the small flow path is small on the upstream side, and gradually increases as it goes downstream.

  By doing in this way, the turning force of gas can be enlarged.

  As a method of dividing the flow path 11, in the present embodiment, four flat plates are arranged at right angles, and the wall portion is formed by twisting along the flow path 11, but is not limited to this method. For example, increase the number of flat plates to form a flow path that has a latticed wall, or select an appropriate shape depending on the application, such as a collection of small flow paths having a circular cross section, honeycomb structure, corrugated structure, etc. Can do.

(Second Embodiment)
FIG. 9 is a perspective view showing a main part of a dust aggregation path as a second embodiment of the present invention.

  As shown in FIG. 9, the dust aggregation path 20 includes a flow path 21, a wall 22, and a swivel unit 23 as vortex generating means. The channel 21 is formed by a cylindrical wall 22.

  FIG. 10 is a view showing the front of the dust aggregation path of the second embodiment of the present invention.

  As shown in FIGS. 9 and 10, the swivel unit 23 includes four surfaces, that is, a surface 23 a, a surface 23 b, a surface 23 c, and a surface 23 d, as wall portions of the swivel unit 23. The surface 23a, the surface 23b, the surface 23c, and the surface 23d are arranged at intervals of 90 ° counterclockwise when viewed from the upstream side of the flow path 21. The respective surfaces are formed perpendicularly from the inner surface of the wall 22 and are connected to each other at the center of the flow path 21 and have a cross shape when viewed from the front. A space defined by two adjacent surfaces and the inner surface of the wall 22 forms a flow path 21.

    FIG. 11 is a view showing a side cross section of the dust aggregation path of the second embodiment of the present invention. The gas flows into the channel from the left side of the figure.

  As shown in FIG. 11, each surface (23a, 23b, 23c, 23d) of the swivel unit 23 is configured such that the twist angle of the cross-shaped cross section does not change from the upstream to the downstream of the flow.

  In addition, the representative length of the flow path width in the plane perpendicular to the flow direction of the swivel unit 23 (the length of one side of the flow path in the case of a square flow path, or the diameter of the flow path in the case of a circular flow path) is defined as a distance D. Then, the torsion angle of the cross-shaped cross section rotates 1/4 in the clockwise direction (90 ° rotation) in the traveling direction while the distance D advances in the flow direction. In this embodiment, the swirl direction of the airflow is clockwise as viewed from the upstream side, but the swirl direction of the airflow may be either clockwise or counterclockwise.

  In the swivel unit 23 of the second embodiment, as in the first embodiment, the airflow that has flowed into the swivel unit 23 travels along the shape of the swirl unit 23 so as to swirl the entire flow path. In the swivel unit 23, compared with the swivel unit 13 of the first embodiment, the strength of the vortex generated downstream of the turbulence generation unit is reduced, but the pressure loss is greatly reduced.

  Accordingly, when the output of a drive source (for example, a fan or a blower) that generates a flow that circulates inside the swivel unit 23 and the static pressure rise are small, or when the drive source is vulnerable to pressure loss, the dust aggregation path 20 By using, the performance of the entire system including the dust aggregation path 20 and the drive source can be improved as compared with the case where the dust aggregation path 10 of the first embodiment is used.

  Moreover, since it is necessary to maintain the air volume while reducing power consumption in a vacuum cleaner or the like due to the recent promotion of low power consumption, it is required to minimize the loss in the flow path. By using the dust aggregation path 20 of the second embodiment of the present invention for an extension pipe of a vacuum cleaner, etc., dust is efficiently aggregated inside the extension pipe while maintaining the air volume, and the dust can be collected with low power consumption. It is possible to provide a vacuum cleaner with good collection efficiency.

  When the flow passing through the flow path 21 is twisted by the swivel unit 23, that is, when the swirl unit 23 imparts swirl to the flow, in the dust aggregation path 20, the twist angle of the cross-shaped cross section is from upstream to downstream. Since the swivel unit 23 is not changed, a swirl angle larger than the twist angle is not given to the flow. Therefore, the length of the swivel unit 23 in the flow direction is such that the flow flowing in the flow path 21 is the flow of the swivel unit 23. It is sufficient up to a position where a flow direction substantially the same as the twist angle of the cross-shaped cross section is obtained. If the swivel portion 23 is further extended in the flow direction, the pressure loss increases unnecessarily due to friction with the wall 22, which is not desirable.

  For this reason, in the second embodiment, the length of the swivel unit 23 in the flow direction is set to 2D, but the flow velocity flowing through the swirl unit 23, the viscosity of the fluid, and other inherent characteristics Suitable dimensions vary depending on physical property values. In addition, if the length of the turning part 23 is set to about 0.5D to 3D, substantially good dust aggregation performance can be obtained.

  For this reason, the twist angle of the cross-shaped cross section is set from 1/6 rotation (60 ° rotation) to 1/3 rotation (120 ° rotation) in the traveling direction while proceeding D in the flow direction. Is desirable. If the twist angle is set to be smaller than 1/6 rotation (60 ° rotation) in the traveling direction while proceeding D in the flow direction, an effective swirl cannot be given to the flow. In addition, when the twist angle is set to be greater than 1/3 rotation (120 ° rotation) in the advancing direction while proceeding D in the flow direction, the pressure loss is extremely large so that the gas flow is blocked. For this reason, the performance of the entire system including the dust aggregation path 20 and the drive source is significantly reduced.

  As described above, the dust aggregation path 20 includes the flow path 21 through which the gas flows, the wall 22 that forms the flow path 21, and the vortex generating means that generates a vortex in the gas flowing through the flow path 21. The means is disposed on the inner surface of the wall 22 and the vortex generating means includes a swivel portion 23 having a wall portion protruding into the flow channel 21 from the inner surface of the wall 22 so as to swirl the gas flow in the flow channel 21. Thus, it is possible to provide a dust aggregation path that can increase the number of collisions of particles in dust and promote aggregation, reduce the number of particles, and increase the apparent particle diameter with a simple structure. .

(Third embodiment)
FIG. 12 is a perspective view showing the main part of the dust aggregation path of the third embodiment of the present invention.

  As shown in FIG. 12, in 3rd Embodiment, it replaces with the turning part 13 of 1st Embodiment, and the turning part 33 is provided. The swivel part 33 has a shape in which the center of the cross-shaped cross section of the swivel part 13 is cut out, and the swivel part 33 exists on the inner surface of the wall 32 of the flow path 31 of the dust aggregation path 30. The center part 31 has a shape in which the turning part 33 does not exist. The flow path 31 is divided into four small flow paths by the turning unit 33. The four small channels communicate with each other at the center of the channel 31.

  FIG. 13: is a front view which shows the principal part of the dust aggregation path of 3rd Embodiment of this invention.

  As shown in FIG. 13, the height h from the inner surface of the wall 32 of the swivel unit 33 is the representative length of the channel width in a plane perpendicular to the flow direction of the channel 31 (the length of one side in the case of a square channel). In the case of a circular channel, the diameter is set to D, and h = (1/8) D. Other portions are the same as the dust aggregation path 10 of the first embodiment.

  FIG. 14 is a diagram schematically illustrating the state of vortices generated by the swivel unit according to the third embodiment of the present invention. FIG. 14A is a view of the flow path as viewed from the front, and FIG. 14B is a view of the flow path as viewed from the side.

  As shown in FIG. 14, the gas P that has flowed into the flow path 31 travels along the shape of the swivel portion 33 while swirling the entire interior of the flow path 31 in the direction of the arrow as indicated by a two-dot chain line.

  According to the dust aggregation path 30, the airflow flowing in the vicinity of the inner surface of the wall 32 of the flow path 31 is swirled by the swivel unit 33, and the airflow flowing through the central part of the flow path 31 is swirled. The swivel provided by 33 is small. Therefore, although the strength of the vortex generated downstream of the swivel portion 33 is smaller than the dust aggregation passage 10 of the first embodiment and the dust aggregation passage 20 of the second embodiment, the pressure loss caused by the swivel portion 33 is greatly increased. To drop.

  As described above, in the dust aggregation path 30, the plurality of small flow paths communicate with each other at the center of the flow path 31, so that the pressure loss in the flow path 31 can be significantly reduced.

  Therefore, when the output of a drive source (for example, a fan or a blower) that generates a flow that circulates inside the swivel unit 33 or a static pressure rise is small, or when the drive source is vulnerable to pressure loss, the first embodiment Compared with the case where the dust aggregation path 10 or the dust aggregation path 20 of the second embodiment is used, the performance of the entire system including the dust aggregation path 30 and the drive source is improved.

  Moreover, since it is necessary to maintain the air volume while reducing power consumption in a vacuum cleaner or the like due to the recent promotion of low power consumption, it is required to minimize the loss in the flow path. By using the dust aggregation path 30 of the third embodiment of the present invention for an extension pipe of a vacuum cleaner, etc., dust is efficiently aggregated inside the extension pipe while maintaining the air volume, and the dust can be collected with low power consumption. It is possible to provide a vacuum cleaner with good collection efficiency.

  In addition, the height h from the wall 32 of the turning part 33 is set to the said dimension for the following reason.

  The flow velocity distribution of the flow through the flow path 31 is fast near the center of the flow path 31 due to the friction of the inner surface of the wall 32 of the flow path 31 and the viscosity of the fluid flowing through the flow path 31, and the wall 32 of the flow path 31. As a result, a boundary layer is formed in the vicinity of the inner surface of the wall 32 of the flow path 31 such that the vicinity of the inner surface of the flow path 31 is slow. In particular, when the size of the aggregated particles (dust and other fine particles) is concentrated in the micron order, the following occurs. That is, the agglomerated particles are transported from the upstream side to the downstream side by receiving a force by continuing to collide with air molecules. At this time, the velocity of the air molecules colliding with one aggregated particle The channel center side is fast and the channel wall side is slow. Then, the aggregated particles receive a force toward the channel wall surface side. Due to the shear force of the flow, the distribution density of the aggregated particles is low near the center of the flow path and high near the wall surface of the flow path. That is, most of the aggregated particles circulate in the vicinity of the channel wall surface. As described above, when the aggregated particles are concentrated in the order of microns, if the representative length of the channel width is D, the distance from the wall surface of the channel is (1 / 8) A phenomenon in which the distribution density of the aggregated particles is particularly high is observed at positions up to D. Therefore, when the swivel portion 33 is provided at a position where the distance from the wall surface of the flow path is (1/8) D, the effect of generating the most turbulent airflow can be exhibited.

  Thus, in the dust aggregation path 30, the swivel portion 33 has a height from the wall 32 that is one eighth of the representative length of the cross section perpendicular to the direction in which the gas in the flow path 31 flows. Foreign matter is less likely to be caught on the turning portion 33.

  According to the dust aggregation path 30 of the third embodiment, it is possible to swirl the flow in the vicinity of the channel wall surface where the aggregated particles are frequently circulated. Further, the flow in the central portion of the flow path where the flow of the aggregated particles is small is not swirled. By doing so, the particles to be aggregated can be effectively swirled, and at the center of the flow path where the flow of the fluid is the fastest, there is no pressure loss causing the aggregation performance. Without loss, the pressure loss caused by the swivel unit 33 can be greatly reduced.

  As described above, the dust aggregation path 30 includes the flow path 31 through which the gas flows, the wall 32 that forms the flow path 31, and the vortex generating means that generates a vortex in the gas flowing through the flow path 31. The means is disposed on the inner surface of the wall 32, and the vortex generating means includes a swivel portion 33 having a wall portion protruding into the flow channel 31 from the inner surface of the wall 32 so as to swirl the gas flow in the flow channel 31. Thus, it is possible to provide a dust aggregation path that can increase the number of collisions of particles in dust and promote aggregation, reduce the number of particles, and increase the apparent particle diameter with a simple structure. .

(Fourth embodiment)
FIG. 15 is a perspective view showing the main part of the dust aggregation path of the fourth embodiment of the present invention, FIG. 16 is a front view showing the main part of the dust aggregation path of the fourth embodiment, and FIG. 17 is the fourth embodiment. It is a figure which shows the side cross section of this dust aggregation path.

  As shown in FIGS. 15 to 17, the dust aggregation path 40 includes a flow path 41, a wall 42, and a plurality of protrusions 43 as vortex generating means. The channel 41 is formed by a cylindrical wall 42. The protrusion 43 is a wing-shaped protrusion. The shape of the protrusion 43 is a chord of a chord with a representative length of the channel width in a plane perpendicular to the flow direction of the channel 41 (the length of one side in the case of a square channel, the diameter in the case of a circular channel) being D. Length C = (3/8) D, streak angle (angle formed by chord and flow direction) is 22.5 ° counterclockwise when viewed from the upstream side to the downstream side, and the maximum warp position is 0. 0 from the leading edge. It has a shape of 65C position, convex on the downstream side, height h = (1/8) D. The protrusions 43 are arranged on the same surface in the direction perpendicular to the flow direction at six equal intervals, that is, on the inner surface of the wall 42 of the circular channel 41 at intervals of 60 °.

  FIG. 18 is a diagram schematically illustrating the gas flow around the protrusions in the dust aggregation path of the fourth embodiment.

  As shown in FIG. 18A, the flow velocity V1 of the flow along the concave side surface of the wing-shaped projection 43 is blocked by the collision of the flow to the projection 43, and the fluid flowing through the flow path 41 is flown. Slightly slower than flow rate. On the contrary, the flow velocity V2 of the flow along the convex side surface of the protrusion 43 is slightly faster than the flow velocity of the fluid flowing in the flow path. Therefore, as shown in FIG. 18B, when considering the relative speed around the protrusion 43 based on the flow velocity of the fluid flowing in the flow path 41, the convex side surface is downstream from the upstream side of the flow path 41. On the concave side, a circulation V3 that rotates around the protrusion 43 occurs from the downstream side of the flow path 41 to the upstream side.

  FIG. 19 is a diagram schematically showing vortices generated around the protrusions.

  As shown in FIG. 19, a strong horseshoe vortex V4 is generated from the wing end of the projection 43 having a wing shape by the circulation V3 around the projection 43 shown in FIG. It moves downstream along the wall 42 of the channel 41 on the downstream side. The horseshoe vortex V4 gives a strong swirl to the flow flowing downstream of the protrusion 43.

  In the dust aggregation path 40 of the fourth embodiment, since the blade height h of the protrusion 43 is h = (1/8) D, the diameter of the horseshoe vortex V4 immediately after the generation of the horseshoe vortex V4 is the flow path 41. Although it depends on the flow velocity of the fluid flowing in the inside, it becomes (1/8) D or a slightly larger size. As described above, in the case where the size of the aggregated particles is concentrated on the order of micron, the distance from the inner surface of the wall 42 of the flow channel 41 having the diameter D is particularly at a position where the distance is (1/8) D. Since a phenomenon in which the distribution density of the aggregated particles is increased is observed, the protrusion 43 is located at a position from the wall 42 of the flow channel 41 where the distribution density of the aggregated particles is increased to (1/8) D by the horseshoe vortex V4. It is set to actively stir.

  Thus, in the dust aggregation path 40, the protrusion 43 has a height from the wall 42 that is one-eighth of the representative length of the cross section perpendicular to the direction of gas flow in the flow path 41. Becomes difficult to catch on the protrusion 43.

  FIG. 20 is a diagram schematically showing the state of vortices generated by the protrusions of the fourth embodiment of the present invention. FIG. 20A is a view of the flow channel as viewed from the front, and FIG. 20B is a view of the flow channel as viewed from the side.

  As shown in FIG. 20, in the dust aggregation path 40, when the gas P flows into the flow path 41, the projections 43 are installed at six equal intervals on the inner surface of the wall 42 of the flow path 41. In the vicinity of the inner surface of the wall 42 of the flow path 41, six horseshoe vortices V4 in the same rotational direction are generated at substantially equal intervals. In addition, since adjacent vortices rotate in the same direction, the flow at the contact surface between the vortex and the vortex is considered to be a streamline vector in a plane perpendicular to the flow direction. Since the direction toward the other side is the direction from the flow path wall surface portion toward the center portion and collides with each other, the collision probability of the fine dust carried in each vortex flow is further increased.

  As described above, in the dust aggregation path 40, the plurality of protrusions 43 are arranged, so that a large number of vortices can be generated in the flow path 41, and the effect of dust aggregation can be enhanced.

  Therefore, if the dust aggregation path 40 of the fourth embodiment is used, the probability of collision of fine dust carried by the flow is higher than that of the dust aggregation path 30 of the third embodiment, so the dust aggregation capacity is greatly enhanced. It is done. In addition, since the height of the protrusion 43 is the same as that of the turning portion 33 of the third embodiment, the pressure loss is also substantially the same as that of the dust aggregation path 30 of the third embodiment. Therefore, according to the dust aggregation path 40 of the fourth embodiment of the present invention, higher performance can be obtained than the dust aggregation path 30 of the third embodiment.

  As described above, in the dust aggregation path 40, the vortex generating means includes the protrusion 43, and the protrusion 43 is formed to protrude from the inner surface of the wall 42 so as to make the velocity of the gas passing around the protrusion 43 uneven. ing.

  In this way, the dust flowing through the dust aggregation path 40 has a stage in which the dust is guided into the flow path 41 by the air flow, a stage in which the dust is conveyed through the flow path 41 by the air flow in which the dust goes straight, and A stage in which the vortex flows and circulates in a vortex generated downstream of the projection 43 protruding from the wall 42 of the flow path 41, a stage in which a plurality of dust collides with each other by the vortex, and a plurality of the collided dust forms a dust mass (cluster). And a stage in which the dust mass is conveyed in the flow path 41 by the airflow.

  In this way, with a simple structure, the number of collisions between particles in the dust is increased to promote aggregation, and the dust aggregation path 40 can reduce the number of particles and increase the apparent particle diameter. Can be provided.

  Further, in this way, in the dust aggregation path 40, a plurality of protrusions 43 are arranged along the direction of gas flow in the flow path 41, and each protrusion 43 is directed from the upstream side to the downstream side of the flow path 41. When the projections 43 are projected, at least a part of each projection 43 is disposed so as to overlap the other projections 43.

  By doing in this way, the gas which flows along the flow path 41 becomes easy to pass the circumference | surroundings of the processus | protrusion 43, and a vortex can be generated efficiently.

  Further, in the dust aggregation path 40, the protrusions 43 are arranged so as to overlap each other when the protrusions 43 are projected from the upstream side to the downstream side of the flow path 41.

  By doing in this way, when the flow path 41 is projected from the upstream toward the downstream side, it becomes possible to secure a large area through which the gas can flow, and therefore, the pressure loss of the flow path 41 can be reduced. it can.

(Fifth embodiment)
FIG. 21 is a perspective view showing the main part of the dust aggregation path of the fifth embodiment of the present invention, FIG. 22 is a front view showing the main part of the dust aggregation path of the fifth embodiment, and FIG. 23 is the fifth embodiment. It is a sectional side view which shows the dust aggregation path | route.

  As shown in FIGS. 21 to 23, in the dust aggregation path 50 of the fifth embodiment, a protrusion 53 is provided instead of the protrusion 43 of the fourth embodiment. One protrusion 53 is formed of a wing-shaped protrusion having the same shape as the protrusion 43 of the fourth embodiment, but the arrangement is different.

  In the dust aggregation path 50, two protrusions 53 adjacent to each other in the flow path direction are arranged stepwise from the upstream side to the downstream side of the flow. The two protrusions 53 arranged in a staircase shape are arranged so as to partially overlap when viewed from the upstream side, that is, when a virtual line of airflow is drawn downstream from the end of the protrusion 53 arranged on the upstream side, It arrange | positions so that a line | wire may cross | intersect the protrusion 53 arrange | positioned downstream. Other portions of the dust aggregation path 50 of the fifth embodiment are the same as the dust aggregation path 40 of the fourth embodiment.

  In the dust aggregation path 50 of the fifth embodiment, the horseshoe vortex V5 generated in the protrusion 53 disposed on the upstream side is further enhanced in the protrusion 53 disposed on the downstream side, whereby a stronger horseshoe vortex V6 is obtained. Generated. The vortex is gradually attenuated as it moves downstream, but the vortex generated in the dust aggregation path 50 has a stronger vortex strength than the vortex generated in the dust aggregation path 40, and therefore the distance (reach distance) until the vortex is attenuated. ) Is long, and can influence the vortex further downstream. In the vicinity of the inner surface of the wall 52 of the flow path 51, six horseshoe vortices in the same rotational direction are generated at substantially equal intervals.

  FIG. 24 is a diagram schematically illustrating the gas flow around the protrusions in the dust aggregation path of the fifth embodiment.

  As shown in FIG. 24, since the two protrusions 53 are arranged stepwise, the horseshoe vortex V5 generated on the upstream side is taken into the vortex generated by the downstream protrusions 53 and is effectively strong horseshoe vortex. V6 can be generated.

  Furthermore, since adjacent vortices rotate in the same direction, the flow at the contact surface between the vortex and the vortex is considered to be a streamline vector in a plane perpendicular to the flow direction. The other direction is the direction from the channel wall surface to the center. In this way, since the flows collide with each other, the collision probability of the fine dust carried in the flows is further increased.

  Therefore, if the dust aggregation path 50 of the fifth embodiment is used, a stronger vortex can be generated, so the reach distance of the vortex is longer, and the collision probability of the fine dust carried by the flow is further increased. Aggregation ability is greatly increased. Moreover, since the friction of the flow is reduced as compared with the dust aggregation path 40 of the fourth embodiment, the pressure loss can be further reduced.

  As described above, in the dust aggregation path 50, a plurality of the protrusions 53 are arranged along the gas flow direction in the flow path 51, and each protrusion 53 protrudes from the upstream side to the downstream side of the flow path 51. The projections 53 are arranged so that at least a part of each projection 53 overlaps the other projections 53 when projected.

  By doing in this way, the gas which flows along the flow path 51 becomes easy to pass the circumference | surroundings of the protrusion 53, and a vortex can be generated efficiently.

  In the dust aggregation path 50, the protrusions 53 are arranged so as to partially overlap each other when the protrusions 53 are projected from the upstream side to the downstream side of the flow path 51.

  By doing so, the vortex generated from the protrusion 53 located on the upstream side is taken into the protrusion 53 located on the downstream side to form a vortex. Strength can be increased. In other words, due to the arrangement relationship between the protrusion 53 located on the upstream side and the protrusion 53 located on the downstream side, the large protrusion while securing the merit of vortex strength that is virtually the same as that when a larger protrusion is formed alone. It is possible to reduce the possibility of dust clogging that occurs in the case of forming, and it is possible to obtain the effect of dust aggregation even if the length of the flow path 51 is shortened.

  Also, the vortices generated by the adjacent protrusions 53 are made to collide with each other before the strength of the vortex is attenuated due to the frictional resistance due to the viscosity of the gas flowing along the flow path 51 or the frictional resistance with the wall 52 surface. This improves the probability of collision between dust particles.

  According to the dust aggregation path 50 of the fifth embodiment, the pressure loss is equivalent to that of the dust aggregation path 40 of the fourth embodiment, but the collision probability of fine dust is compared to the dust aggregation path 40 of the fourth embodiment. Therefore, according to the dust aggregation path 50, a higher performance dust aggregation path can be obtained.

(Sixth embodiment)
FIG. 25 is a perspective view showing the main part of the dust aggregation path of the sixth embodiment of the present invention, FIG. 26 is a front view showing the main part of the dust aggregation path of the sixth embodiment, and FIG. 27 is the sixth embodiment. It is a sectional side view which shows the dust aggregation path | route.

  As shown in FIGS. 25 to 27, in the dust aggregation path 60 of the sixth embodiment, a projection 63a, a projection 63b, a projection 63c, and a projection 63d are provided in place of the projection 53 of the fifth embodiment. The protrusions (63a, 63b, 63c, 63d) are formed by wing-shaped protrusions having the same shape as the protrusion 53, and the number of the protrusions is the same, but the adjacent protrusion 63a and protrusion 63c, protrusion 63b and protrusion 63d are Arrangement is made so that the wrong angle (angle between the chord and the flow direction) is opposite to each other. That is, the projections (63a, 63b, 63c, 63d) have a curved shape so as to form a recess, and two projections adjacent to each other in the direction intersecting the gas flow direction are opposed to each other. Are arranged to be. On the wall 62 in the flow path 61, three protrusions 63 a are provided in the circumferential direction of the cross section perpendicular to the direction of the airflow, and the angle of the stagger is 22.5 clockwise as viewed from the upstream side to the downstream side. The three protrusions 63c are arranged at equal intervals so as to be at an angle of 3 °, and between the three protrusions 63a, the three protrusions 63c become 22.5 ° counterclockwise as viewed from the upstream side to the downstream side. Arrange as follows. Further, on the downstream side of the projections 63a and 63c, three projections 63b are arranged in a clockwise direction when viewed from the upstream side to the downstream side in the circumferential direction of the cross section perpendicular to the airflow direction. It is arranged at equal intervals so as to be 5 °, and between each of the three projections 63b, the three projections 63d are set to 22.5 ° counterclockwise when the misfeed angle is seen from the upstream side to the downstream side. Arrange so that Along the airflow direction, the protrusion 63b is disposed on the downstream side of the protrusion 63a, and the protrusion 63d is disposed on the downstream side of the protrusion 63c. The four protrusions are arranged such that the distance between the recesses of the protrusion 63a and the protrusion 63c is larger than the distance between the protrusions 63b and the recess of the protrusion 63d.

  In the dust aggregation path 60 of the sixth embodiment, a horseshoe vortex similar to the projection 43 of the fourth embodiment is generated in each projection (63a, 63b, 63c, 63d), and the horseshoe vortex is located downstream of the projection. Since it moves downstream along the wall 62 of the flow path 61, a strong swirl is given to the flow flowing downstream of the protrusion.

  FIG. 28 is a diagram schematically showing the state of vortices generated around the projections of the dust aggregation path of the sixth embodiment.

  As shown in FIG. 28, in the flow path 61 of the dust aggregation path 60 of 6th Embodiment, 12 protrusions are arrange | positioned so that each may face the direction which is alternate. Therefore, in the vicinity of the inner surface of the wall 62 of the flow path 61, six horseshoe vortices V7 in which adjacent vortices rotate in opposite directions are generated. The horseshoe vortex V7 generated by the upstream projection 63a and the projection 63c is taken into the airflow flowing between the downstream projection 63b and the projection 63d to generate a strong horseshoe vortex V8. Furthermore, since the protrusions 63b and the protrusions 63d are alternately arranged, the vortices generated by the downstream protrusions 63b and the protrusions 63d work so as to strengthen each other, so that a stronger horseshoe vortex V8 can be generated.

  Since adjacent vortices rotate in opposite directions, the flow at the contact surface between the vortex and the vortex is considered to be a streamline vector in a plane perpendicular to the flow direction. If the direction is toward the center, the other will be in the same direction, and if one is toward the center from the channel wall, the other will be in the same direction. Decrease. Therefore, in the flow path 61 of 6th Embodiment, the pressure loss by a vortex reduces compared with the flow path 51 of 5th Embodiment.

  Thus, in the dust aggregation path 60, the projections (63a, 63b, 63c, 63d) have a curved shape so as to form a recess, and two projections adjacent to each other in the direction intersecting the gas flow direction. Are arranged such that two recesses face each other. In other words, in the dust aggregation path 60, the protrusions (63a, 63b, 63c, 63d) change the direction of the airflow flowing into the flow path 61, and adjacent protrusions 63a and 63c, protrusions 63b, and protrusions 63d. , The change directions of the airflow directions are opposite to each other. By doing in this way, the vortex produced | generated by the adjacent processus | protrusion advances downstream, rotating mutually in the opposite direction. Therefore, on the contact surface between adjacent vortices, the airflows forming these vortices are flows that advance in the same direction. Therefore, the vortices generated by the adjacent protrusions merge smoothly, and the frictional resistance due to the viscosity of the flow decreases. Thus, the pressure loss in the flow path 61 can be reduced.

  Therefore, if the dust aggregation path 60 of 6th Embodiment is used, since the friction of a flow will be reduced rather than the dust aggregation path 40 of 4th Embodiment, pressure loss can be reduced more. The collision probability of fine dust due to flow friction is about 5% lower than that of the dust aggregation passage 40 of the fourth embodiment, but the pressure loss is about 10% lower than that of the dust aggregation passage 40 of the fourth embodiment. Therefore, according to the sixth embodiment, it is possible to obtain the dust aggregation path 60 having higher performance than the dust aggregation path 40 of the fourth embodiment.

(Seventh embodiment)
FIG. 29 is a perspective view of the essential part of the dust aggregation path of the seventh embodiment of the present invention, and FIG. 30 is a front view showing the essential part of the dust aggregation path of the seventh embodiment.

  As shown in FIGS. 29 and 30, in the dust aggregation passage 70 of the seventh embodiment of the present invention, a plurality of protrusions 73a are formed on the inner surface of the wall 72 of the flow path 71 instead of the protrusions 43 of the fourth embodiment. And a protrusion 73b. The protrusion 73a and the protrusion 73b are protrusions having a triangular bottom surface.

  FIG. 31 is a diagram illustrating a protrusion according to the seventh embodiment. FIG. 31A is a bottom view of the protrusion, FIG. 31B is a side view of the protrusion, and FIG. 31C is a front view of the protrusion. The upstream side of the flow path is the front.

  As shown in FIG. 31, the length of each side of the bottom surface portion ΔEFG of the protrusion 73a forms a right triangle where EF: FG: GE = 1: 2: √3, and among the apex angles of the right triangle, An angle G forming 30 ° is arranged on the upstream side of the flow, and a side EF sandwiched between the angles of 60 ° and 90 ° is arranged so as to be perpendicular to the flow direction, and the bottom surface portion Δ of the protrusion 73a The EFG is joined to the inner surface of the wall 72 of the flow channel 71. The remaining vertex I of the protrusion 73 a is formed so as to protrude from the wall 72 into the flow path 71.

  The protrusion 73a has a flow direction in the flow direction, where D is the representative length of the flow path width in a plane perpendicular to the flow direction of the flow path 71 (the length of one side in the case of a square flow path, the diameter in the case of a circular flow path). Length GE = (3/8) D, the angle formed between the flow direction and the hypotenuse is 30 ° clockwise when viewed from the upstream side to the downstream side, and the height h of the protrusion 73a is h = (1/8) D It has a certain shape. In the protrusion 73b adjacent to the protrusion 73a, the angle formed by the flow direction and the hypotenuse is 30 ° counterclockwise when viewed from the upstream side to the downstream side. On the wall 72 of the flow path 71, four protrusions 73a are arranged at equal intervals, and four protrusions 73b are arranged between the four protrusions 73a, so that the protrusions 73a and 73b face so-called alternate directions. Are arranged.

  FIG. 32 is a diagram schematically illustrating an air flow around the protrusion according to the seventh embodiment.

  As shown in FIG. 32, the flow velocity V9 of the flow along the oblique side GI of the projection 73a is blocked by the collision of the flow of the projection 73a, and becomes slightly slower than the flow velocity P of the fluid flowing in the flow path 71. On the other hand, the flow velocity V10 of the flow along the side GE in the flow direction of the protrusion 73a is substantially equal to the flow velocity P of the fluid flowing in the flow channel 71. Therefore, when considering the relative speed around the protrusion 73a based on the flow velocity of the fluid flowing in the flow path 71, on the side GE in the flow direction, from the upstream side of the flow path 71 to the downstream side, on the hypotenuse FG In FIG. 3, circulation that rotates around the protrusion 73a occurs from the downstream side of the flow path 71 to the upstream side. By this circulation, a horseshoe vortex V11 is generated from the apex of the projection 73a having a triangular pyramid shape, and the horseshoe vortex V11 moves downstream along the wall 72 of the channel 71 on the downstream side of the projection 73a. The horseshoe vortex 11 turns the flow flowing downstream of the protrusion 73a. A horseshoe vortex is formed in the protrusion 73b as well as the protrusion 73a, but the direction of rotation of the horseshoe vortex is opposite.

  In the seventh embodiment, since the height h of the protrusion 73a and the protrusion 73b is h = (1/8) D, the diameter of the horseshoe vortex V11 immediately after the horseshoe vortex is generated is the fluid that circulates in the flow path 71. Although it depends on the flow rate of (1/8) D, it will be (1/8) D or slightly larger. As described above, when the size of the aggregated particles is concentrated on the order of micron, particularly at a position where the distance from the wall 72 of the flow path 71 having the diameter D is (1/8) D. Since the phenomenon that the distribution density of the aggregated particles increases is observed, the protrusion 73a and the protrusion 73b of the seventh embodiment are (1/8) D from the wall 72 of the flow channel 71 where the distribution density of the aggregated particles is particularly high. The gas passing through the position is actively stirred by generating a horseshoe vortex.

  As described above, in the dust aggregation path 70, the protrusion 73a and the protrusion 73b have a height from the wall 72 that is 1/8 of the representative length of the cross section perpendicular to the gas flow direction of the flow path 71. The foreign matter is less likely to be caught by the protrusion 73a and the protrusion 73b.

  FIG. 33 is a diagram schematically showing the state of vortices generated by the protrusions of the seventh embodiment of the present invention. FIG. 33A is a view of the flow path as viewed from the front, and FIG. 33B is a view of the flow path as viewed from the side.

  As shown in FIG. 33, eight horseshoe vortices V <b> 11 are generated in the vicinity of the wall 72 of the flow path 71, with adjacent vortices rotating in opposite directions. Since the adjacent vortices rotate in opposite directions, the flow at the contact surface between the vortex and the vortex is considered to be a streamline vector in a plane perpendicular to the flow direction, and one of the vortices is from the center to the wall surface. If the direction is toward the other side, the other will be in the same direction, and if one is in the direction from the channel wall to the center, the other will be in the same direction. The frictional resistance is reduced, so that pressure loss due to vortices is reduced in the dust aggregation passage 70 of the seventh embodiment.

  In the case where rod-like foreign matters such as length D and thickness 0.05D are mixed in the fluid flowing through the flow path 71, for example, in the first to sixth embodiments, the swirling part of the dust aggregation path and The shape of the protrusion has a curved structure. Particularly, since the protrusion has a concave shape on the upstream side and a convex shape on the downstream side, one end of the rod-like foreign material is caught by one vortex generating means, When the end is caught by other vortex generating means, there is a possibility that a foreign matter is clogged inside the dust aggregation path. On the other hand, in the dust aggregation path 70 of the seventh embodiment, the projection 73a has no recess, and for example, instead of the concave surface of the projection 43 of the fourth embodiment, the projection 73a and the projection 73b are formed with oblique sides. The rod-like foreign matters and the like as described above are not easily caught by the protrusions.

  Thus, in the dust aggregation path 70, the cross-sectional area of the protrusion 73a and the protrusion 73b in the direction perpendicular to the gas flow direction is small on the upstream side and large on the downstream side. By doing in this way, it becomes difficult for a foreign material to catch on the protrusion 73a and the protrusion 73b.

  Therefore, if the dust aggregation passage 70 of the seventh embodiment is used, substantially the same effect as that of the fifth embodiment can be obtained, and, for example, a rod-like flow can be formed compared to the dust aggregation passages of the first to sixth embodiments. If there is a possibility that other foreign matters may be mixed in, it is possible to prevent a problem that the rod-like foreign matter is caught by the turbulent generation part and clogged, so that a highly reliable dust aggregation path can be obtained.

(Eighth embodiment)
FIG. 34 is a perspective view of the essential part of the dust aggregation path of the eighth embodiment of the present invention, FIG. 35 is a front view showing the essential part of the dust aggregation path of the eighth embodiment, and FIG. It is a figure which shows the side cross section of the dust aggregation path of 8 embodiment.

  As shown in FIGS. 34 to 36, in the eighth embodiment, a plurality of protrusions 83 are provided instead of the protrusions 73a and 73b in the seventh embodiment. The protrusion 83 is a triangular pyramid-shaped protrusion.

  FIG. 37 is a diagram illustrating a shape (A) of the protrusion according to the eighth embodiment viewed from above and a shape (B) viewed from the side.

  As shown in FIG. 37, the shape of the protrusion 83 is an isosceles triangle in which the bottom KL of the triangular pyramid △ JKL has a base KL: height JM = 1: 2, and the minimum angle J of the bottom isosceles triangle. Is arranged on the upstream side of the flow, the base KL is arranged so as to be perpendicular to the flow direction, and is joined to the channel wall surface at the bottom. Further, assuming that the apex angle of the triangular pyramidal projection is N, a perpendicular line extending from the apex angle N to the isosceles triangle at the bottom surface passes through M, that is, NM is configured to be perpendicular to JM and KL, respectively. Has been. Then, let D be the representative length of the channel width (the length of one side in the case of a square channel, the diameter in the case of a circular channel) in a plane perpendicular to the flow direction of the channel 81, and the length JM in the flow direction. = (1/2) D, triangular pyramid height NM = (1/8) D.

  A large number of protrusions 83 are regularly arranged on the inner surface of the wall 82 of the flow path 81. In the dust aggregation path 80, a plurality of protrusions 83 are arranged at intervals of (3/2) JM in the flow direction and (3/2) KL in the direction perpendicular to the flow, and flow is performed with respect to one protrusion 83. (3/4) JM in the direction and (3/4) KL in the direction perpendicular to the flow are further disposed at a position shifted by KL, and a plurality of protrusions 83 are (3/2) JM in the flow direction. Is arranged in such a manner that it is further arranged at intervals of (3/2) KL in a direction perpendicular to. In other words, if one pitch in the flow direction is (3/2) JM and one pitch in the direction perpendicular to the flow is (3/2) KL, both the flow direction and the direction perpendicular to the flow are shifted by half a pitch. In addition, a plurality of multi-stage arrangements are made in a so-called staggered arrangement.

  FIG. 38 is a shape (A) of a part of the protrusion according to the eighth embodiment viewed from the side surface, and a view (B) in which the protrusion is projected from the upstream side to the downstream side of the airflow.

  As shown in FIG. 38A, the upstream protrusion 83a and the downstream protrusion 83b are such that the upstream end of the protrusion 83b located on the downstream side is the downstream end of the protrusion 83a located on the upstream side. It is arrange | positioned so that it may be located in the upstream by fixed width D1 rather than a part. As shown in FIG. 38B, when these projections 83 are projected from the upstream side, the plurality of projections 83 do not completely overlap each other, and the adjacent projections 83a and 83b When projected from the side to the downstream side, they are arranged so as to overlap by a certain width D2. In FIG. 38B, the overlapping portion is surrounded by a broken line. Other parts are the same as those of the fifth embodiment.

  According to the dust aggregation path 80 of the eighth embodiment, the flow flowing in the vicinity of the inner surface of the wall 82 of the flow path 81 is directed to the bottom surface of the triangular pyramid by the inclination of the surface JNK and the surface JNL of the protrusion 83 forming the triangular pyramid protrusion. It is lifted to the apex angle N side, wound up to the center of the flow path, and generates a weak twin vortex downstream of the apex angle N. The flow flowing through the dust agglomeration path 80 of the eighth embodiment is disturbed by the weak twin vortex created by the projection 83 that first meets, and is also disturbed by the weak twin vortex created by the projection 83 that meets downstream, and It is further disturbed one after another, such as being further disturbed by the weak twin vortex created by the protrusion 83 that flows further downstream and meets the next. Such disturbance occurs at each of the plurality of protrusions 83. As described above, when the aggregated particles are concentrated in the order of microns, if the diameter of the flow path is D, the distance from the wall 82 of the flow path 81 to (1/8) D. In particular, since the phenomenon in which the distribution density of the aggregated particles becomes high is observed at the position of FIG. 8, the projections 83 arranged in a plurality of stages in the eighth embodiment particularly from the wall surface of the flow path where the distribution density of the aggregated particles becomes high. The position of the distance to (1/8) D is actively disturbed by a plurality of twin vortices.

  Thus, in the dust aggregation path 80, the protrusion 83 has a height of 1/8 or less of the representative length of the cross section perpendicular to the direction of gas flow in the flow path 81. Becomes difficult to catch on the protrusion 83.

  Further, when projected from the upstream side, the plurality of projections 83 do not completely overlap each other, and when projected from the upstream side, the adjacent projections 83 are arranged so as to overlap each other by a certain amount. The flow flowing along the wall 82 of the path 81 always meets the protrusion 83. Thereafter, the flow flowing along the wall 82 of the flow path 81 passes through the dust aggregation path 80 while encountering the protrusion 83 again and again as it flows downstream.

  Thus, in the dust aggregation path 80, a plurality of protrusions 83 are arranged along the direction in which gas flows in the flow path 81, and each protrusion 83 protrudes from the upstream side to the downstream side of the flow path 81. The projections 83 are arranged so that at least a part of each projection 83 overlaps the other projections 83 when the projection 83 is projected. By doing in this way, the gas which flows along the flow path 81 becomes easy to pass the circumference | surroundings of the protrusion 83, and a vortex can be generated efficiently.

  Further, in the dust aggregation path 80, the protrusions 83 are arranged so as to partially overlap each other when the protrusions 83 are projected from the upstream side to the downstream side of the flow path 81.

  By doing so, the vortex generated from the protrusion 83a located on the upstream side is taken into the protrusion 83b located on the downstream side to form a vortex. Strength can be increased. In other words, the arrangement of the protrusion 83a located on the upstream side and the protrusion 83b located on the downstream side ensures a merit that provides a vortex strength that is virtually the same as the case where a larger protrusion is formed alone, while providing a large protrusion. It is possible to reduce the possibility of dust clogging that occurs in the case of forming, and it is possible to obtain the effect of dust aggregation even if the length of the flow path 81 is shortened.

  Further, before the strength of the vortex is attenuated due to the frictional resistance due to the viscosity of the gas flowing along the flow path 81 and the frictional resistance with the wall 82 surface, the vortices generated by the adjacent protrusions 83 collide with each other. This improves the probability of collision between dust particles.

  Further, in the dust aggregation path 80, the upstream end portion of the projection 83b located on the downstream side of the airflow is disposed on the upstream side of the downstream end portion of the projection 83a located on the upstream side.

  By doing so, the vortex strength of the vortex generated from the protrusion 83a located on the upstream side is attenuated by the influence of the frictional resistance due to the viscosity of the gas flowing along the flow path 81, the frictional resistance with the wall 82 surface, and the like. Since it can be made to collide with the vortex generated from the protrusion 83b located on the downstream side, the collision probability of the dust particles can be further improved effectively.

  Further, the protrusion 83 is disposed as compared with the case where the upstream end of the protrusion 83b located on the downstream side of the airflow is not disposed on the upstream side of the downstream end of the protrusion 83a located on the upstream side. Since the interval to be performed can be further shortened, more protrusions 83 can be formed in the short dust aggregation path 81.

  Therefore, in the dust aggregation path 80 of the eighth embodiment, the twins generated can be most efficiently disturbed with respect to the airflow flowing through the position from the wall 82 of the flow path 81 to the distance of (1/8) D. The number of vortices can be increased.

  Thus, in the dust aggregation path 80, a plurality of protrusions 83 are arranged along the direction of gas flow in the flow path 81, and each protrusion 83 is a protrusion 83 from the upstream side to the downstream side of the flow path 81. Since the projections are arranged so that some of the projections overlap each other, the gas flowing along the flow path 81 can easily pass around the projections 83 and efficiently generate vortices. .

  Further, the fluid flowing through the dust aggregation path 80 is a cloth-like material made of a flexible material, for example, and has a foreign substance having a size similar to the diameter of the flow path 81 (for example, a cloth-like or mesh-like material, for example, For example, in the first embodiment to the seventh embodiment, the shape of the swivel part and the protrusion, which are the vortex generating means of the dust aggregation path, form a curved structure or a rectangle. However, there is a possibility that the cloth-like foreign matter is easily caught by the vortex generating means, so that the foreign matter may be clogged inside the dust aggregation path. Since the smooth triangular pyramid protrusion is formed on the upstream side, the cloth-like foreign matter and the like are not easily caught.

  Therefore, if the dust aggregation passage 80 of the eighth embodiment is used, for example, the flow is more than that of the dust aggregation passages of the first to seventh embodiments while obtaining sufficient aggregation performance due to the disturbance of a large number of twin vortices. If there is a possibility that a cloth-like foreign matter or the like may be mixed in, it is possible to prevent a problem that the cloth-like foreign matter is caught by the turbulent generation part and clogged. Obtainable.

(Ninth embodiment)
FIG. 39 is a perspective view of the essential part of the dust aggregation path of the ninth embodiment, FIG. 40 is a front view showing the essential part of the dust aggregation path of the ninth embodiment, and FIG. 41 is the ninth embodiment. It is a figure which shows the side cross section of the principal part of this dust aggregation path.

  As shown in FIGS. 39 to 41, in the dust aggregation passage 90 of the ninth embodiment, a plurality of protrusions 93 are provided on the inner surface of the wall 92 of the flow path 91 in place of the protrusion 83 of the eighth embodiment. ing. Each protrusion 93 is formed by a triangular pyramid protrusion having the same shape as the protrusion 83 of the eighth embodiment, and the arrangement or arrangement thereof is different. That is, in the ninth embodiment, the number of projections 93 that is 1/3 of the number of the projections 83 in the eighth embodiment is arranged so as to coincide with the arrangement of the projections 83 when projected from the upstream side. That is, when projected from the upstream side, the plurality of protrusions 93 are not completely overlapped with each other, and when projected from the upstream side, the adjacent protrusions 93 are arranged to overlap each other by a certain amount. Further, as many projections 93 as possible are not arranged in the plane perpendicular to the flow direction, and the plurality of projections 93 arranged in the same plane perpendicular to the flow direction are as far from each other as possible. Set to be placed at a distance. Other parts are the same as those in the eighth embodiment.

  According to the dust aggregation path 90 of the ninth embodiment of the present invention, the protrusion 93 generates a twin vortex that is substantially the same as the vortex generated in the protrusion 83 of the eighth embodiment. Further, when projected from the upstream side, the plurality of protrusions 93 do not completely overlap each other, and when projected from the upstream side, the adjacent protrusions 93 are arranged so as to overlap each other by a certain amount. The flow flowing along the wall 92 of the path 91 always passes through the protrusion 93. However, since the number of protrusions 93 is 1/3 of the protrusions 83 of the eighth embodiment, the number of times the flow flowing along the wall 92 of the flow channel 91 is disturbed and the protrusions 93 are encountered is also increased. And the collision probability between the aggregated particles is reduced.

  However, the projection 93 of the ninth embodiment has the following advantages. That is, in the dust aggregation path 80 of the eighth embodiment, a large number of projections 83 are arranged in a plane perpendicular to the flow direction, and the projection 83 is a plane perpendicular to the flow direction. The area of the flow path 81 at the position of the surface ΔNKL is arranged in the same plane in the direction perpendicular to the flow direction with respect to the area of the flow path 81 at the position of the surface in the direction perpendicular to the other flow direction. The number of protrusions 83) × (area of surface ΔNKL). Therefore, the greater the number of protrusions 83 arranged in the same plane in the direction perpendicular to the flow direction, the greater the reduction width of the flow path area in that portion, so the pressure loss in the dust aggregation path 80 becomes larger. . On the other hand, in the dust aggregation path 90 of the ninth embodiment, as many projections 93 as possible are not arranged in the plane perpendicular to the flow direction, and in the same plane perpendicular to the flow direction. Since the plurality of arranged projections 93 are set so as to be arranged as far as possible from each other, the reduction in the flow area at the position where the projections 93 are arranged is small. Pressure loss is also reduced.

  That is, for example, the flow direction length of the flow path 91 of the ninth embodiment is set to 3 times, and the number of the protrusions 93 of the ninth embodiment is set to be the same as the number of the protrusions 83 of the eighth embodiment. Then, the collision probability between the aggregated particles is almost the same as that of the dust aggregation path 80 of the eighth embodiment, but the length is reduced by 3 because the decrease width of the flow path area at the position where the projection 93 is arranged is small. The dust aggregation path 90 set to double the pressure loss is also smaller.

  Therefore, if the dust aggregation passage 90 of the ninth embodiment is used, a large pressure loss reduction effect can be obtained. For example, if the dust aggregation passage 90 having a length three times is used, the pressure loss can be reduced with respect to the dust aggregation passage 80 of the eighth embodiment without impairing the aggregation performance due to the collision of the aggregated particles. When the output or static pressure rise of a driving source (for example, a fan or a blower) that generates a flow that circulates in the flow path 91 is small, or when the driving source is vulnerable to pressure loss, the dust aggregation path 90 and The performance of the entire system including the driving source is improved.

(10th Embodiment)
FIG. 42 is a perspective view of the essential part of the dust aggregation path of the tenth embodiment, FIG. 43 is a front view showing the essential part of the dust aggregation path of the tenth embodiment, and FIG. 44 is the tenth embodiment. It is a figure which shows the side cross section of this dust aggregation path.

  As shown in FIGS. 42 to 44, in the dust aggregation path 100 of the tenth embodiment, a plurality of protrusions 103 are provided on the inner surface of the wall 102 of the flow path 101 in place of the protrusions 93 of the ninth embodiment. ing. Each protrusion 103 is formed by a triangular pyramidal protrusion having the same shape as the protrusion 83 of the eighth embodiment, and the arrangement or arrangement thereof is different. That is, when projected from the upstream side, the plurality of protrusions 103 do not overlap each other, and when projected from the upstream side, the adjacent protrusions 103 are arranged at a certain interval. Moreover, the arrangement | sequence which does not arrange | position the some protrusion 103 in the surface of the direction perpendicular | vertical to a flow direction may be sufficient. Other parts are the same as those in the eighth embodiment.

  According to the dust aggregation path 100 of the tenth embodiment, the protrusion 103 generates a twin vortex substantially the same as the vortex generated by the protrusion 83 of the eighth embodiment. However, the number of the projections 83 of the eighth embodiment is small, and when projected from the upstream side, the plurality of projections 103 are arranged so as not to overlap each other. Most of the flow that circulates meets the protrusion 103 only once, and the flow that circulates between the protrusion 103 and the protrusion 103 never meets the protrusion 103. Therefore, in the dust aggregation path 100 of the tenth embodiment, the disturbance that can be imparted to the flow is significantly reduced compared to the dust aggregation path 80 of the eighth embodiment.

  However, the dust aggregation path 100 of the tenth embodiment has an advantage that the molding method is extremely easy. That is, when projected from the upstream side, the plurality of protrusions 103 do not overlap with each other, and when projected from the upstream side, the adjacent protrusions 103 are arranged at a predetermined interval. When the path 100 is molded by resin, the upstream side of the dust aggregation path 100 is set to the movable side of the mold, the downstream side of the dust aggregation path 100 is set to the fixed side of the mold, and the mold is configured. The dust aggregation path 100 can be integrally molded without requiring a simple mold configuration.

  Further, in the case where a plate-like foreign material (for example, a milk cap) having the same area as the cross section of the flow path 101 is mixed in the fluid flowing through the dust aggregation path 100, for example, the third embodiment. In the dust aggregation path of the ninth embodiment, since a plurality of turbulence generating portions are arranged in a plane perpendicular to the flow direction, a plate-like foreign material having an area approximately the same as the cross section of the flow path It is highly likely that the end of each of the two will be caught by a plurality of protrusions at the same time, and there is a possibility that foreign matter will be clogged inside the dust aggregation path. However, in the tenth embodiment, the protrusion 103 is in the flow direction. Since the plurality of protrusions 103 are set in an arrangement in which the plurality of protrusions 103 are not arranged in the plane in the vertical direction, plate-like foreign matters having an area comparable to the cross section of the channel 101 are not easily caught.

  Therefore, when the dust aggregation passage 100 of the tenth embodiment is used, the moldability is extremely good and, for example, there is a possibility that a plate-like foreign material having an area approximately the same as the cross section of the flow path may be mixed in the flow. In this case, it is possible to prevent a problem that foreign matter is caught by the turbulence generation unit and clogged. In this way, it is possible to obtain a dust aggregation path having both extremely high formability and extremely high reliability.

  45 to 49 are diagrams schematically showing another arrangement of the protrusions according to the tenth embodiment. (A) The figure seen in the direction perpendicular | vertical to a flow-path direction, (B) The schematic diagram projected from the upstream of the flow.

  As shown in FIG. 45, a plurality of protrusions 103 are arranged on the periphery of the surface in the direction perpendicular to the flow direction, but each protrusion is preferably close to each other in the case of a cylindrical flow path. If a plurality of protrusions 103 arranged in a plane perpendicular to the flow direction are gathered in a range of about 90 °, both extremely high formability and extremely high reliability can be obtained at the same time.

  As shown in FIG. 46, as shown in FIG. 47, the adjacent protrusions 103 are arranged so as to be slightly shifted so as not to overlap with each other to prevent clogging of foreign matters caused by the protrusions, and to obtain a similar effect as shown in FIG. Examples of the protrusions are divided into groups and the groups are shifted from each other in the direction of the flow path, and a sawtooth arrangement as shown in FIGS. All of these can provide extremely high moldability.

  FIG. 50 is a diagram illustrating the arrangement of adjacent protrusions in the dust aggregation path of the tenth embodiment.

  As shown in FIG. 50, when the projections 103 are arranged so that they do not overlap in the projection plane viewed from the direction parallel to the flow direction, if the distance between adjacent projections 103 is a distance W, W is expressed by the following equation. be able to.

W = 2α + γ tan β (where α, β, γ are any positive integers)
In the protrusion 103, α and β are each 3 mm or more, and γ (mm) is an arbitrary number.

  When the dust aggregation path 100 is produced using a mold separated in the direction S parallel to the airflow, the flow path 101 and the protrusion 103 can be molded at a time. By doing so, the molding cost can be greatly reduced. As for the distance between the protrusions 103, a minimum of W (mm) is secured so that the protrusions do not overlap with each other in the projection plane perpendicular to the air flow, and the mold that enters between the protrusions The strength of the can be ensured.

(Eleventh embodiment)
51 is a perspective view of the essential part of the dust aggregation path of the eleventh embodiment, FIG. 52 is a front view showing the essential part of the dust aggregation path of the eleventh embodiment, and FIG. It is a figure which shows the side cross section of a dust aggregation path.

  As shown in FIGS. 51 to 53, in the eleventh embodiment of the present invention, a plurality of protrusions 113 are provided on the inner surface of the wall 112 of the flow path 111 in place of the protrusion 83 of the eighth embodiment. . The protrusion 113 has a size 1/2 (the length in the flow direction: JM = (1/4) D, the height of the triangular pyramid: NM = (1/16) D, compared with the protrusion 83 of the eighth embodiment. ) Of the similar shape of the triangular pyramidal projections, and is also arranged with a similarity of 1/2. The number of triangular pyramidal projections is set to about four times that of the eighth embodiment. Other parts are the same as those in the eighth embodiment.

  According to the dust aggregation passage 110 of the eleventh embodiment, the projection 113 generates a twin vortex having a substantially similar shape with a scale of ½ with respect to the projection 83 of the eighth embodiment. The twin vortex generated by one protrusion 113 is weaker than the twin vortex generated by the protrusion 83 of the eighth embodiment, but since the number of protrusions 113 is set correspondingly, the disturbance is substantially the same. Can be given to the flow.

  However, in the case where the size of the aggregated particles is concentrated on the order of microns as described above, the aggregated particles are particularly at a position from the wall surface of the channel 111 having the diameter D to (1/8) D. In the eleventh embodiment, the protrusions 113 arranged in multiple stages are set to a height of (1/16) D. Of the positions at a distance from the wall 112 of the channel 111 where the density is increased to (1/8) D, only about half of the regions can be positively disturbed.

  However, the protrusion 113 of the eleventh embodiment has the following advantages. That is, the height of the protrusion 113 of the eleventh embodiment is set to (1/16) D, and is ½ of the height of the protrusion 83 of the eighth embodiment, so that it is perpendicular to the flow direction. Since the reduction width of the flow path area by the projections 113 arranged in the same plane in the direction becomes ¼, the pressure loss of the dust aggregation passage 110 is correspondingly larger than that of the dust aggregation passage 80 of the eighth embodiment. Becomes smaller.

  Furthermore, since the height of the protrusion 113 of the eleventh embodiment is set to (1/16) D, the speed at which the twin vortex generated by the protrusion 113 develops on the wall 112 of the flow path 111 of the dust aggregation path 110. The boundary layer is affected and the boundary layer thickness is reduced.

  In general, a velocity boundary layer is formed in the vicinity of the wall surface of the flow path due to the viscosity of the fluid flowing through the flow path. The flow velocity inside the boundary layer is lower than that at the center of the flow path, and the flow resistance in the region is large. That is, as the boundary layer develops and the boundary layer becomes thicker, the area of the region that easily flows is reduced, and the behavior of the cross-sectional area of the channel is apparently reduced. Therefore, when the boundary layer develops and the boundary layer becomes thicker, the pressure loss in the flow path increases.

  Since the twin vortex generated by the protrusion 113 of the eleventh embodiment has a small vortex scale and is generated near the wall surface, the twin vortex generated by the protrusion 113 suppresses the development of the boundary layer. The resistance to the flow of the flow path wall surface is reduced, and the pressure loss of the flow path 111 is greatly reduced.

  For example, when the diameter D of the flow path 111 is D = 40 mm, the typical flow velocity is 25 m / second, and the normal temperature and the normal pressure, according to the experimental results, (pressure loss due to the turbulence generating portion) <(boundary layer due to the turbulence generating portion) Despite the presence of a large number of protrusions 113, the dust aggregation path 110 having a pressure loss smaller than that of the flow path without the protrusions was obtained.

  In addition, even when foreign matter or the like is mixed in the fluid flowing through the dust aggregation passage 110, the protrusion 113 is 1/2 the height of the protrusion 83 of the eighth embodiment, so the protrusion 113 is Foreign matter is less likely to be caught on the protrusion 83 of the eighth embodiment.

  Therefore, if the dust agglomeration passage 110 of the eleventh embodiment is used, the frictional resistance of the pipe can be further reduced while obtaining sufficient agglomeration performance due to the disturbance of a large number of twin vortices. A reduced dust aggregation path 110 can be obtained. Further, for example, even when there is a possibility that foreign matter or the like may be mixed in the flow, it is possible to almost completely prevent a problem that the foreign matter is caught by the protrusion 113 and therefore, the extremely reliable dust aggregation path 110 is provided. Obtainable.

  Although omitted in each embodiment, by forming a 1 mm radius on each side of the turbulence generation unit, it is possible to significantly reduce clogging. Furthermore, a dust aggregation path with good maintenance performance can be formed by eliminating the acute groove.

(Twelfth embodiment)
A dust aggregation passage according to a twelfth embodiment of the present invention includes a swivel portion according to any one of the first to third embodiments or any one of the fourth to eleventh embodiments on a part of the upstream side of the flow path. A part of the downstream side of the flow path or a swivel part or a protrusion has a protrusion, and the first charging part that positively contacts and charges dust contained in the gas flowing through the flow path, and the gas flowing through the flow path And a second charging unit that negatively charges the dust, and the first charging unit and the second charging unit are arranged to face each other.

  By doing in this way, the gas which flows into the dust aggregation path of 12th Embodiment passes a dust aggregation path, passing through the following steps. That is, the stage in which dust is guided into the flow path by the air flow, the stage in which the dust is conveyed through the flow path by the straight air flow, the stage in which the dust flows along the wall surface of the flow path, and the dust in the flow path A stage in which it collides with a protrusion protruding from the wall surface, a stage in which dust is engulfed and circulated in a vortex generated downstream of the protrusion, a stage in which the dust collides with the wall surface of the flow path several times by the vortex, and a plurality of dust vortex The step of colliding with each other, the step of forming a dust mass (cluster) by the plurality of collided dusts, and the step of transporting the dust mass inside the flow path by the air flow are sequentially performed.

  At this time, the airflow flowing through the first charging unit and the second charging unit is controlled as follows. That is, when the dust is transported inside the flow path by the airflow, the dust is collided with the wall surface and the protrusion and charged, and then the airflow control is performed so that the dust collides with each other. A period for forming a cluster is provided.

  By doing so, the collision between the positively charged dust colliding with the first charging unit and the dust not colliding with the first charging unit is promoted. When those dusts collide, dielectric polarization occurs on the surface of the latter dust due to the charge of the former dust, and a strong binding force is generated between the former dust and the latter dust due to electrostatic force. By this binding force, a first dust mass in which a plurality of dusts are aggregated is generated. The first dust mass is positively charged as a whole. Further, a second dust mass that is negatively charged as a whole by the second charging unit is generated by the same mechanism as that of the first dust mass.

  Further, the air flow control is performed so that the positively charged first dust mass generated by the first charging unit and the negatively charged second dust mass generated by the second charging unit collide with each other. And a period in which the colliding first dust mass and the second dust mass are combined by electrostatic force to form a larger dust mass (large cluster) is provided.

  By performing the airflow control in this manner, the collision between the first dust mass that is positively charged as a whole and the second dust mass that is negatively charged as a whole is promoted.

  When the first dust lump collides with the second dust lump, the former dust lump and the latter lump due to the strong electrostatic force generated from the positive charge of the former lump and the negative charge of the latter lump. A stronger binding force is generated between the dust particles. Due to this binding force, a large dust mass is formed by further agglomerating a plurality of dust masses.

  By performing such airflow control, fine dust repeatedly agglomerates due to collision, and becomes a large dust mass (large cluster).

  Thus, in the dust aggregation path, the wall and / or the vortex generating means are included in the first charging unit that positively contacts and charges the dust contained in the gas flowing through the flow path, and the gas flowing through the flow path. A first charging unit that has a second charging unit that negatively charges the dust, and is disposed so that the first charging unit and the second charging unit face each other; When the dust is conveyed through the flow path by the air flow, the second charging unit that negatively charges and charges the dust is charged with a different polarity by contacting the first charging unit or the second charging unit, and is positive or negative. A dust mass (cluster) can be formed in the charged dust. Thereby, dust particles (clusters) can be formed by adsorbing positively or negatively charged dust to each other by electrostatic action.

  A plurality of protrusions are provided on the inner surface of the wall of the flow path, and the arrangement is such that when the dust aggregation path is projected from the upstream side, the plurality of protrusions are arranged so as to partially overlap each other. Or it becomes easy to collide with a protrusion.

  As described above, in the dust aggregation path having both the vortex generating means and the charging portion, the vortex generating means protrudes into the flow path, so that the particles easily come into contact with the inner wall. Furthermore, the collision probability between the wall surface and the particles can be increased by increasing the wall surface area by the vortex generating means. The collision probability between the particle and the wall surface can be increased by the vortex generated by the vortex generating means, so that the number of contact between the particle and the inner wall can be increased. By doing so, the particles in the dust are more likely to be charged, so that the particles are more easily aggregated, and the generation of the dust mass is promoted.

  As another form of the twelfth embodiment, when the dust aggregation passages of the first embodiment to the third embodiment are formed using a charging member, the plurality of small flow paths divided by the swivel portion are flow paths. A first small flow path that positively contacts and charges dust contained in the gas flowing through the gas, and a second small flow path that negatively charges dust contained in the gas flowing through the flow path, You may arrange | position so that a path | route and a 2nd small flow path may adjoin.

  For example, the small flow path surrounded by the surface 13a, the surface 13b, and the wall 12 of the first embodiment, and the small flow path surrounded by the surface 13c, the surface 13d, and the wall 12 are defined as the first small flow path. The small flow path surrounded by 13b, the surface 13c, and the wall 12 and the small flow path surrounded by the surface 13d, the surface 13a, and the wall 12 are defined as a second small flow path.

  Thus, by dividing the flow path 11 into small flow paths, compared to the case where the flow path 11 is not divided into small flow paths, the influence of shear on the gas from the wall 12 is increased, and the dust cohesive force is increased. It is possible to increase. Further, the swirl flows formed in the respective small flow paths collide with each other on the downstream side of the small flow path terminal portion, and as a result, the particles taken into the swirl flow can be efficiently collided with each other.

  As still another form of the twelfth embodiment, when the dust aggregation passages of the fourth to eleventh embodiments are formed using a charging member, the protrusions are provided with dust contained in the gas flowing through the flow path. It has a first protrusion that is positively contact-charged and a second protrusion that negatively charges dust contained in the gas flowing through the flow path so that the first protrusion and the second protrusion face each other. It may be arranged.

  For example, the protrusion 63a and the protrusion 63d of the sixth embodiment are the first protrusions, and the protrusion 63c and the protrusion 63d are the second protrusions.

  Thus, when the dust is conveyed through the flow path by the airflow, the projection 63a and the projection 63d that positively charge the dust and the projection 63c and the projection 63d that negatively charge the dust, the dust is transferred to the first protrusion. Alternatively, it is possible to form a dust mass (cluster) in dust that is charged with a different polarity in contact with the second protrusion and charged positively or negatively. Thereby, dust particles (clusters) can be formed by adsorbing positively or negatively charged dust to each other by electrostatic action.

  Moreover, in the dust aggregation path of 12th Embodiment, it is preferable that the protrusion is formed of the same material as the wall.

  By doing so, particles in the dust contained in the gas flowing in the flow path are charged regardless of which of the wall and the protrusion collides, so that the effect of aggregation can be enhanced.

(13th Embodiment)
A dust aggregation passage according to a thirteenth embodiment of the present invention includes a swivel portion according to any one of the first to third embodiments or any one of the fourth to eleventh embodiments on a part of the upstream side of the flow path. A part or swivel part or protrusion on the downstream side of the flow path has a protrusion and is formed of a material that can positively or negatively charge dust contained in the gas flowing through the flow path.

  In the dust aggregation path having the above-described configuration, a stage in which dust is guided into the flow path by the air flow, a stage in which the dust is conveyed through the flow path by the straight air flow, and a stage in which the dust flows along the wall surface of the flow path A stage in which the dust collides with a protrusion protruding from the wall surface of the flow path, a stage in which the dust is engulfed and circulated in a vortex generated downstream of the protrusion, and a stage in which the dust collides with the wall surface of the flow path several times by the vortex The step of colliding each other with a plurality of dusts by a vortex, the step of forming a dust mass (cluster) with the plurality of collided dusts, and the step of transporting the dust mass inside the flow path by the air flow are sequentially performed.

  At this time, the airflow flowing through the dust aggregation path is controlled as shown below. That is, when the dust is transported inside the flow path by the air flow, the dust is collided with the wall surface and the protrusion and charged, and then the air flow control is performed so that the dust collides with each other. A period for forming a cluster is provided.

  By doing so, the collision between the dust positively or negatively charged by colliding with the dust aggregation path and the dust not colliding with the dust aggregation path is promoted. When those dusts collide, dielectric polarization occurs on the surface of the latter dust due to the charge of the former dust, and a strong binding force is generated between the former dust and the latter dust due to electrostatic force. Due to this binding force, a dust mass (cluster) in which a plurality of dusts are aggregated is generated.

  By performing such airflow control, fine dust aggregates due to collision and forms a dust mass (cluster).

  As another form of the thirteenth embodiment, when the dust aggregation path of the first to third embodiments is formed using a charging member, the swivel part is included in the gas flowing through the small flow path. You may form with the material which can carry out contact charge of dust positively or negatively.

  For example, the swivel part 13 of the dust aggregation path of the first embodiment is formed of a material capable of positively or negatively charging the dust contained in the gas flowing through the small flow path.

  When the flow path is divided into small flow paths, the probability that the particles collide with the swivel portion is increased as compared with the case where the flow path is not divided. The flow path 11 is divided into small flow paths by the swivel unit 13, and the swivel part 13 is formed of a material capable of positively or negatively charging the dust contained in the gas flowing through the small flow path. In addition, the effect of dust aggregation can be enhanced by increasing the charge amount of the particles.

  As still another form of the thirteenth embodiment, when the dust aggregation path of the fourth embodiment to the eleventh embodiment is formed by a charging member, the protrusions positively or negatively detect dust contained in the gas flowing through the flow path. It may be formed of a material that can be negatively charged by contact.

  For example, the protrusion 43 of the fourth embodiment is formed of a material that can positively or negatively charge dust contained in the gas flowing through the flow path 41.

  By doing so, the collision between the dust positively or negatively charged by colliding with the projection 43 of the dust aggregation path 40 and the dust not colliding with the projection 43 of the dust aggregation path 40 is promoted. When these dusts collide, dielectric polarization occurs on the surface of the dust that has not collided with the projections 43 of the dust aggregation path 40 due to the charge of the dust charged positively or negatively by colliding with the projections of the dust aggregation path 40, Strong binding force is generated between the former dust and the latter dust by the electrostatic force. Due to this binding force, a dust mass (cluster) in which a plurality of dusts are aggregated is generated.

  By performing such airflow control, fine dust tends to aggregate due to collision, and a dust mass (cluster) is likely to be formed.

  In the dust aggregation path of the thirteenth embodiment, the protrusion is preferably formed of the same material as the wall.

  By doing so, particles in the dust contained in the gas flowing in the flow path are charged regardless of which of the wall and the protrusion collides, so that the effect of aggregation can be enhanced.

  As described above, the present invention relates to a mechanism for aggregating fine particles. Since it is possible to improve the collection efficiency of fine particles using this mechanism, the dust aggregation path of the present invention can be applied to a vacuum cleaner, an air cleaner, an air conditioner, and the like.

(14th Embodiment)
FIG. 54 is a diagram showing an entire vacuum cleaner including the dust aggregation passage of the present invention as a fourteenth embodiment of the present invention, and FIG. 55 is a diagram of the main body of the vacuum cleaner including the dust aggregation passage of the present invention. It is explanatory drawing of a structure.

  As shown in FIGS. 54 and 55, the suction port 501 is sequentially connected to an extension pipe 502, a connection pipe 503 having a handle, and a bendable suction hose 504, and is connected to the cleaner main body 506 via the connection portion 505. Has been. The vacuum cleaner main body 506 includes an electric blower 567, a dust collection unit 561, a dust collection case 563, a HEPA filter 570, a cord reel (not shown), a control circuit (not shown) that controls energization of the electric blower 567, and the like. Contained. When the electric blower 567 is driven, air is sucked from the suction port 501, and the air containing dust passes through the extension pipe 502, the connection pipe 503, and the suction hose 504 including the dust aggregation path of the present invention, which serves as a ventilation path, and the vacuum cleaner. It is conveyed to the main body 506. The dust sucked into the cleaner body 506 passes through the dust collection unit 561, the electric blower 567, and the HEPA filter 570 and is discharged from the exhaust unit 571. In this way, the dust having a large size among the dust sucked from the suction port 501 is accumulated in the dust collecting portion 561. In addition, the air that has been cleaned by collecting dust passes through the inside of the electric motor 569 in order to cool the electric blower 567 and is exhausted out of the cleaner body 506. Further, on the side surface of the cleaner body 506, there are provided wheels 507 that are rotatably provided and support the cleaner body 506 on the floor surface 508 so as to be movable.

  When the electric blower 567 is driven, a suction airflow is generated by the fan 568, and air containing dust flows into the cleaner body 506 from the suction hose 504 and the body connection part 505, and the connection part 562, the dust collection filter 564, and the connection Air is blown toward the section 565, the fan 568, the electric motor main body 569, the HEPA filter 570, and the exhaust port 571. At this time, air containing fine dust and dust lump is conveyed while being mixed with airflow while being conveyed, so that contact, suction and adsorption are performed, and the dust lump according to the present invention grows further.

  Largely grown dust particles are larger than the size of the eyes of the dust collection filter 564, and are thus collected by the dust collection filter 564. If a plurality of charging parts are provided, or if a structure that can increase the contact between fine dust and the charging part is taken, the dust collection lump will be larger than the size of the eyes of the dust collection filter 564, so that the HEPA filter 570 is not required. Can do.

  Here, if the dust mass does not grow larger than the size of the eyes of the dust collection filter 564, it may pass through the filter 564. In such a case, a HEPA filter 570 may be provided for collection.

  Thus, the electric vacuum cleaner has the electric blower 567, the extension pipe 502 communicating from the suction port 501 to the electric blower 567, and the dust collecting portion 561, and sucks dust by the air flow generated by the electric blower 567. In the electric vacuum cleaner that sucks the dust from the extension pipe 502 and collects the dust passing through the extension pipe 502 in the dust collecting portion 561, the extension pipe 502 includes the dust aggregation passage according to any of the embodiments of the present invention. In the extension pipe 502, the sucked dust can be aggregated to form a dust mass (cluster). By appropriately growing the dust mass, the mass of the dust mass can be increased and the cluster can be enlarged. By increasing the mass of the dust mass, for example, a cyclone cleaner can collect the dust mass by centrifugation. Further, in the filter type vacuum cleaner, the dust mass can be made larger than the eyes of the filter, so that it is possible to collect dust even with a filter having a large eye. In either case, pressure loss is unlikely to occur in the intake air, so that the dust absorption power (work rate) of the vacuum cleaner body is less likely to decrease.

(Fifteenth embodiment)
FIG. 56 is a schematic diagram for explaining the state of airflow near the entrance of the flow path.

  As shown in FIG. 56, when the gas P cannot be changed suddenly when flowing into the flow path 1, the rounded end surface is not formed on the inlet end face of the flow path 1. The air flow is separated from the wall 2 of the flow channel 1 to generate a contracted flow 8 that forms a vortex near the entrance of the flow channel 1. In the circular channel having a diameter D, the contracted flow 8 is generated over a length of about 4D from the inlet of the channel 1. The region 9 a shows an example of a region where there is no contracted flow 8 in the flow channel 1, and the region 9 b shows a region where the contracted flow 8 is largest in the flow channel 1. The height of the contracted flow 8 from the wall 2 of the flow channel 1 at the position of the region 9b is defined as a height T. When the contracted flow 8 is generated in the flow channel 1, the inner diameter of the flow channel 1 is artificially reduced so that the region 9b is smaller than the region 9a, and pressure loss occurs. In the region 9b, the inner diameter of the flow channel 1 is considered to be pseudo (D-2T).

  In order to prevent such pressure loss, a rounded portion is formed at the entrance of the circular tube in order to suppress the development of contraction flow.

  FIG. 57 is a schematic diagram for explaining the state of the airflow in the vicinity of the inlet of the flow path in the flow path in which a rounded portion having a rounded end surface is formed on the inlet end face of the flow path.

  As shown in FIG. 57, when the rounded portion 2a is formed on the inlet end surface of the flow path 1, the contracted flow 8 can be suppressed as compared with the flow path without the rounded portion 2a.

  In order to sufficiently obtain the effect of stirring the airflow by the vortex generating means, it is necessary to avoid the contracted flow 8 and arrange the vortex generating means. When the vortex generating means is installed in the region of the contracted flow 8, the vortex generating effect cannot be sufficiently exerted, so that the air flow separated from the wall 2 at the inlet of the flow path 1 is reattached to the wall 2. It is also desirable to install it downstream.

  Thus, in the dust aggregation path of the fifteenth embodiment, the vortex generating means is arranged at a position where there is no contracted flow in the flow path, so that the effect of vortex generation can be enhanced.

  However, when it is necessary to install the vortex generating means in the contracted flow region 8, it is necessary to ensure the height of the vortex generating means that is higher than the height in the radial direction of the contracted flow region.

  Here, the installation position where the effect of stirring the airflow can be maximized will be described. Using a circular pipe with a diameter D = 40 mm as the flow path, the representative flow velocity of the flow in the flow path is 20 m / second, normal temperature and normal pressure, and the distance X from the inlet where the air flow reattaches to the pipe wall is It confirmed visually by making a fine powder flow in.

  Table 1 shows the relationship between the size of the rounded portion and the distance X from the entrance of the flow path to the position where the vortex generating means is installed. A0 indicates the cross-sectional area of the circular tube region 9a. A1 shows the cross-sectional area of the area 9b, which is the minimum part of the portion where the airflow circulates in the contracted flow area generated in the circular pipe.

When there is no round portion, the loss coefficient of the airflow flowing into the circular pipe is ξ = 0.56, and the contraction coefficient Cc is obtained from Cc = (1 + √ξ) ⁻¹ and Cc = 0.57. The height T in the radial direction of the contracted flow region in this case is considered to be T = about 4.9 mm. If the height of the vortex generating means is 5 mm, the vortex generating means is completely buried in the vortex area when installed in the contracted flow area, and the desired effect cannot be exhibited. However, if the vortex generating means is installed with the distance X = 160 mm (4D) secured from the pipe entrance while avoiding contraction, the vortex generating means can be installed immediately after the airflow is reattached, thereby obtaining a desired effect. (See Mechanical Engineering Handbook, 4th edition, A5-77).

  In the dust aggregation path of the fifteenth embodiment, the vortex generating means may be disposed in the flow path at a position that is separated from the inlet of the flow path by a distance that is four times the representative length of the cross section of the flow path. preferable. By doing in this way, a vortex generating means can be arrange | positioned in the position without a contracted flow. Therefore, the effect of vortex generation by the vortex generating means can be enhanced.

  When the radius R of the rounded portion is R = 5 mm, the loss coefficient of the airflow flowing into the circular pipe is ξ = 0.28, and the contraction coefficient Cc is Cc = 0.65. In this case, the height of the contracted flow region in the radial direction is considered to be about 3.9 mm. As for the position where the airflow reattached, reattachment was confirmed visually at a position 40 mm from the tube inlet. In order to avoid the contraction and install the vortex generating means, it is necessary to secure a distance X = 40 mm from the pipe entrance. By securing this distance, the vortex generating means can be installed immediately after the airflow is reattached, so that a desired effect can be obtained.

  When the radius R of the rounded portion is R = 10 mm, a desired effect can be obtained even if the stirring portion is installed immediately after the entrance of the circular tube.

  In the dust aggregation path of the fifteenth embodiment, it is preferable that a rounded portion having a rounded end surface is formed on the inlet end surface of the flow path, and the vortex generating means is disposed in the vicinity of the inlet of the flow path.

  By forming the rounded portion on the inlet end face of the flow path, the contracted flow generated in the flow path is reduced, so even if the vortex generating means is arranged near the inlet, the effect of the vortex generation is affected by the contracted flow. It becomes difficult to receive.

(Sixteenth embodiment)
FIG. 58 is a diagram showing an entire electric vacuum cleaner provided with a dust aggregation path of the present invention as a sixteenth embodiment of the present invention.

  As shown in FIG. 58, the electric vacuum cleaner 6c includes an upstream dust aggregation passage 161 as a flow path, downstream from the upstream end of the extension pipe 502 having a length a by a distance c, and further downstream thereof. A certain main body connection portion 505 includes a downstream dust aggregation path 162. The upstream dust collecting path 161 is the dust collecting path of the twelfth embodiment having a length b, and the first charging unit that charges dust positively and the second charging unit that charges dust negatively face each other. It is arranged to form the wall of the dust aggregation path. The downstream dust aggregation path 162 is the dust aggregation path of any one of the first to eleventh embodiments having a length d.

  The effect in the upstream dust aggregation path 161 is the same as the effect of the twelfth embodiment. That is, since the upstream dust collecting path 161 is formed of a functional material capable of charging particles, the dust particles are charged by contacting the dust particles with the wall surface, and the Coulomb force generated between the charged dusts. Is used to effectively improve the collision probability of dust particles.

  In this way, in the upstream dust aggregation path 161, the collision probability between particles increases. Increase the probability of contact with the inner wall surface, and increase the number of charged particles and the amount of charged particles.

  Further, the collision probability between particles can be increased by the action of the vortex generated by the vortex generating means included in the upstream dust aggregation path 161 arranged in the extension pipe 502, and the dust particle and the inner wall surface can be increased. Increase the collision probability and increase the number of charged particles and the amount of charged particles. The particles in the extension tube 502 are agitated by the vortex generating means to charge all the particles.

  By doing in this way, the collision probability of the particles by a vortex generating means can be increased, and the collision of particles can be promoted.

  In the downstream dust aggregation path 162, the dust particles are effectively agitated, the collision probability is increased, and all the dust particles charged in the upstream dust aggregation path 161 are aggregated. The downstream-side dust aggregation path 162 is formed of a material that hardly generates charges even when particles collide with the wall surface.

  Some of the charged particles in the upstream dust aggregation path 161 do not collide with each other before reaching the downstream dust aggregation path 162. In addition, since the vortex intensity decreases as the distance from the dust aggregation path increases, the stirring ability decreases and the collision probability between particles decreases. Therefore, by providing the downstream dust aggregation path 162 as a dust aggregation path that is not formed of a functional material that easily charges the particles, the collision probability between the charged particles in the upstream dust aggregation path 161 is increased. Promotes particle aggregation.

  In this way, it is possible to efficiently generate agglomeration by creating a charged state of particles and causing them to collide more effectively.

  When the downstream dust aggregation passage 162 is formed of a functional material having an effect of newly charging dust particles charged to any polarity in the upstream dust aggregation passage 161, the upstream dust aggregation passage 161 and the downstream dust aggregation passage 162 are formed. When the dust particles are charged with the same polarity by the above, the charge amount of the particles is further increased, and a stronger Coulomb force can be generated. However, the dust particles are separated by the upstream dust aggregation passage 161 and the downstream dust aggregation passage 162. When charged to a different polarity, the charge of the particles is neutralized.

  Another example in which the charge of particles is neutralized is that functional materials that positively charge particles and functional materials that negatively charge particles are arranged alternately at equal intervals in the direction of airflow in the flow path. In some cases, the swirl flow of the entire flow path with the vicinity of the center of the flow path as the swivel center is generated by the protrusion. The dust particles positively charged in contact with the wall that positively charges the particles are then negatively charged in contact with the wall that negatively charges the particles, resulting in neutralization of the dust particle charge. .

  In addition, when the flow path is divided into two in a direction parallel to the direction in which the air flow flows in the flow path, the functional materials that are positively and negatively charged are arranged on one side at the same ratio, and the swirling flow is generated by the protrusion. Similarly, dust particles that are positively charged in contact with the wall that positively charges the particles first, and then negatively charged in contact with the wall that negatively charges the particles, resulting in the charge of the dust particles being Neutralized.

  However, as in the present embodiment, the downstream dust aggregation path 162 is formed of a material that is difficult to transfer charges, and in the downstream dust aggregation path 162, the dust particles given by the upstream dust aggregation path 161 are charged. Without neutralizing, all particles collide with each other by the action of the vortex formed in the downstream dust aggregation path, so that a dust mass (cluster) can be effectively formed.

  As one effect of the present invention, there is an effect of reducing particulates in the exhaust of the vacuum cleaner. This increases the average size by agglomerating fine particles upstream of the dust collecting means of the vacuum cleaner, thereby increasing the collection efficiency of the dust collecting means and reducing the number of fine particles contained in the exhaust. .

  Hereinafter, the experimental result which investigated the relationship between the magnitude | size and number of the particle | grains contained in exhaust_gas | exhaustion about the conventional vacuum cleaner and the vacuum cleaner provided with the dust aggregation path | route of this invention is demonstrated.

  FIG. 59 is a view showing an overall outline of a conventional vacuum cleaner provided with a cyclone dust collecting chamber as a control machine, and FIG. 60 is an overall view of the vacuum cleaner provided with the dust collecting passage of the present invention. It is a figure which shows an outline.

  As shown in FIGS. 59 and 60, the tube length a of the extension pipe 502 of the conventional vacuum cleaner 6a and the vacuum cleaner 6b including the dust aggregation path of the present invention includes the control unit and the dust aggregation path of the present invention. In both of the vacuum cleaners, 700 mm, the inner diameter of the extension tube 502 was 35 mm, and the wind speed at the center of the tube was 20 m / sec.

  As shown in FIG. 60, in the vacuum cleaner provided with the dust aggregation path of the present invention, the dust aggregation path of length b was formed at a position c from the tip of the extension pipe 502. The length b of the dust aggregation path was 200 mm, and the distance c was 100 mm.

  The size and number of particles contained in the exhaust gas were measured according to JIS C 9802 (a method for measuring the performance of a household vacuum cleaner).

  From the measurement results, the exhaust rate reduction rate of the vacuum cleaner 6b provided with the dust aggregation path of the present invention was determined. The reduction rate of the displacement was determined as follows. That is, the ratio of the decrease in the number of particles measured in the exhaust of the vacuum cleaner 6b having the dust aggregation path of the present invention to the number of particles measured in the exhaust of the conventional vacuum cleaner 6a is exhausted. The amount reduction rate. For example, if the reduction rate of the exhaust amount is 30%, the number of particles measured in the exhaust of the vacuum cleaner 6b having the dust aggregation path of the present invention is measured in the exhaust of the conventional vacuum cleaner 6a. It shows that it was 70% of the number of particles. The reduction rate of the displacement was determined for the total number of exhaust particles having a particle diameter of 0.1 μm or more.

  Table 2 shows the exhaust amount reduction rate when the dust aggregation path of each embodiment is used as the dust aggregation path included in the electric vacuum cleaner 6b.

  FIG. 61 shows the size and number of particles contained in the exhaust gas for a conventional vacuum cleaner provided with a cyclone dust collection chamber and a vacuum cleaner provided with a cyclone dust collection chamber and provided with a dust aggregation passage of the present invention. It is a figure which shows the relationship. In addition, the vertical axis | shaft of FIG. 61 is the value which represented the number of dusts relatively with the maximum value being 1.

  As the dust aggregation path of the present invention, the dust aggregation path 10 of the first embodiment and the dust aggregation path 110 of the eleventh embodiment are used. In both the vacuum cleaner using the dust aggregation passage 10 of the first embodiment and the dust aggregation passage 110 of the eleventh embodiment, the number of dust in the exhaust gas is reduced as compared with the conventional vacuum cleaner. In particular, a decrease in dust having a particle size of 0.1 μm to 0.4 μm was clearly seen.

  FIG. 62 shows a reduction rate (%) of particles contained in exhaust gas in a conventional vacuum cleaner provided with a cyclone dust collection chamber and a vacuum cleaner provided with a cyclone dust collection chamber and provided with a dust aggregation passage of the present invention. ) And pressure loss (Pa).

As shown in FIG. 62, the vacuum cleaner including the dust aggregation passage 10 of the first embodiment has a higher exhaust particle reduction rate than the vacuum cleaner including the dust aggregation passage of the other embodiments, but the pressure loss Was also the highest. On the other hand, in the electric vacuum cleaner comprising a dust flocculation path 70 of the seventh embodiment, the reduction rate of the exhaust particles is lowest, was lower pressure loss.

  FIG. 59 is a view showing an overall outline of a conventional vacuum cleaner provided with a cyclone dust collecting chamber as a control machine, and FIG. 60 is an overall view of the vacuum cleaner provided with the dust collecting passage of the present invention. FIG.

As shown in FIG. 59 and FIG. 60, the vacuum cleaner 6 a, pipe length a of the extension tube 502 and 6b includes a control unit 6a, for both the vacuum cleaner 6b comprising the dust agglomeration path of the present invention also, 700 mm, The tube inner diameter of the extension tube 502 was 35 mm, and the wind speed at the tube center was 20 m / sec.

As shown in FIG. 60, the vacuum cleaner 6 b comprising a dust flocculation path of the present invention, to form a dust flocculation path length b from the front end of the extension tube 502 at a distance c. The length b of the dust aggregation path was 400 mm, and the distance c was 100 mm. Polypropylene resin was used as the first charging part for positively charging the particles, and nylon resin was used as the second charging part for negatively charging the particles.

  The size and number of particles contained in the exhaust gas were measured according to JIS C 9802 (a method for measuring the performance of a household vacuum cleaner).

  FIG. 63 shows the size and number of particles contained in the exhaust gas for a conventional vacuum cleaner provided with a cyclone dust collection chamber and a vacuum cleaner provided with a cyclone dust collection chamber and provided with a dust aggregation passage of the present invention. It is a figure which shows the relationship. Note that the vertical axis in FIG. 63 is a value relatively representing the number of dusts with the maximum value being 1.

  As shown in FIG. 63, the relationship between the size and number of particles in the exhaust gas was compared between a conventional vacuum cleaner provided with a cyclone dust collection chamber and a vacuum cleaner provided with a dust aggregation passage of the present invention.

  As the dust aggregation path of the present invention, the dust aggregation path 10 of the first embodiment, the dust aggregation path 110 of the eleventh embodiment, and the dust aggregation path of the twelfth embodiment are used. As the dust aggregating path of the twelfth embodiment, a dust aggregating path in which the protrusions are formed by a charging member is used. The vacuum cleaner using any of the dust aggregation passage 10 of the first embodiment, the dust aggregation passage 110 of the eleventh embodiment, and the dust aggregation passage of the twelfth embodiment is more exhausted than the conventional vacuum cleaner. The number of dust has decreased. In particular, a decrease in dust having a particle size of 0.1 μm to 0.4 μm was clearly seen. Moreover, in the vacuum cleaner provided with the dust aggregation passage of the twelfth embodiment of the present invention, the particle size of the particles contained in the exhaust gas is 0. 0 compared to the conventional vacuum cleaner provided with the cyclone dust collection chamber. When compared with the total number of exhaust particles of 1 μm or more, the reduction was 40.1%. Regarding the dust aggregation path of the twelfth embodiment, in addition to the dust aggregation path in which the protrusion portion used in this example is formed by the charging member, the dust aggregation path or protrusion in which the downstream side of the protrusion is formed by the charging member The dust aggregation effect can be obtained even if a dust aggregation path in which the upstream side is formed by the charging member is used. In the twelfth embodiment, when the effect of dust aggregation is shown in descending order, when the protrusion is formed of a charging member, when the downstream side of the protrusion is formed of a charging member, the upstream side of the protrusion is formed of a charging member. If so, then

  An experiment was conducted to examine the difference in the ease of catching foreign matter depending on the height of the protrusion. The diameter D of the circular tube is 40 mm, the typical flow velocity of the flow is 20 m / second, and the normal temperature and the normal pressure. The circles in the table indicate that no foreign object has been caught three times, and the x marks indicate that it has been caught by a triangular pyramid three times. The Δ mark indicates that the foreign material is disturbed and caught on the generating part once out of 3 measurements. Here, in Table 3, the shape of the bottom surface of the triangular pyramid is the same, the height of the triangular pyramid as a protrusion is set as h = D / α, and the value of α is changed to 2, 4, 8, 16 The result of performing suction measurement three times each to determine whether or not the foreign matter is caught in the turbulence generation part when foreign matters flow into the circular pipe for a total of 10 types shown in Table 3 is shown. Moreover, the measurement result of the dust aggregation path shown in the sixth embodiment is also shown for reference.

  From the results shown in Table 3, it was found that most foreign substances pass without being caught when the triangular pyramid height is h = 5 mm ((1/8) D). In addition, when each side from the bottom surface of the triangular pyramid is shaped like a triangular prism with the height direction arranged in a direction perpendicular to the flow, the foreign matter is not a hypotenuse for the flow as in this embodiment. Easy to get caught. Table 4 shows the same measurement results when rounded portions are formed on each side forming the triangular pyramid.

  As shown in Table 4, even when the height of the triangular pyramid is h = 10 mm ((1/4) D), foreign matters are less likely to be caught by forming round portions on each side forming the triangular pyramid.

  It should be considered that the embodiments and examples disclosed above are illustrative and non-restrictive in every respect. The scope of the present invention is shown not by the above-described embodiments and examples but by the scope of claims, and includes all modifications and variations within the meaning and scope equivalent to the scope of claims.

It is a figure which shows typically the air flow in the inside of a cylindrical pipe | tube. It is a figure which shows typically a mode that particle | grains aggregate when the airflow in a flow path is laminar flow velocity distribution. It is the schematic diagram which showed the influence which a particle | grain with a large diameter receives from a velocity gradient when the airflow in a flow path is laminar velocity distribution. It is the schematic diagram which showed the influence which a particle | grain with a small diameter receives from a velocity gradient when the airflow in a flow path is laminar velocity distribution. It is a figure which shows the dust aggregation path | route of 1st Embodiment of this invention. It is a figure which shows the front of the dust aggregation path of 1st Embodiment of this invention. It is a figure which shows the side cross section of the dust aggregation path of 1st Embodiment of this invention. It is the figure which showed typically the mode of the vortex generated by the turning part of 1st Embodiment of this invention. FIG. 8A is a view of the flow path as viewed from the front, and FIG. 8B is a view of the flow path as viewed from the side. It is a perspective view which shows the principal part of a dust aggregation path as 2nd Embodiment of this invention. It is a figure which shows the front of the dust aggregation path of 2nd Embodiment of this invention. It is a figure which shows the side cross section of the dust aggregation path of 2nd Embodiment of this invention. It is a perspective view which shows the principal part of the dust aggregation path of 3rd Embodiment of this invention. It is a front view which shows the principal part of the dust aggregation path of 3rd Embodiment of this invention. It is the figure which showed typically the mode of the vortex generated by the turning part of 3rd Embodiment of this invention. FIG. 14A is a view of the flow path as viewed from the front, and FIG. 14B is a view of the flow path as viewed from the side. It is a perspective view which shows the principal part of the dust aggregation path of 4th Embodiment of this invention. It is a front view which shows the principal part of the dust aggregation path of 4th Embodiment of this invention. It is a sectional side view which shows the dust aggregation path of 4th Embodiment of this invention. It is a figure which shows typically the flow of the gas around the processus | protrusion in the dust aggregation path of 4th Embodiment. It is a figure which shows typically the vortex which arises around a processus | protrusion. It is the figure which showed typically the mode of the vortex which generate | occur | produces with the protrusion of 4th Embodiment of this invention. (A) is the figure which looked at the flow path from the front, (B) is a figure when the flow path is seen from the side. It is a perspective view which shows the principal part of the dust aggregation path of 5th Embodiment of this invention. It is a front view which shows the principal part of the dust aggregation path of 5th Embodiment. It is a sectional side view which shows the dust aggregation path of 5th Embodiment. It is a figure which shows typically the flow of the gas around the processus | protrusion in the dust aggregation path of 5th Embodiment. It is a perspective view which shows the principal part of the dust aggregation path of 6th Embodiment of this invention. It is a front view which shows the principal part of the dust aggregation path of 6th Embodiment. It is a sectional side view which shows the dust aggregation path of 6th Embodiment. It is a figure which shows typically the mode of the vortex which generate | occur | produces around the protrusion of the dust aggregation path of 6th Embodiment. It is the perspective view which saw through the principal part of the dust aggregation path of 7th Embodiment of this invention. It is a front view which shows the principal part of the dust aggregation path of 7th Embodiment. It is a figure which shows the protrusion of 7th Embodiment. (A) is a bottom view of the protrusion, (B) is a side view of the protrusion, and (C) is a front view of the protrusion. It is a figure which shows typically the mode of the airflow around the protrusion of 7th Embodiment. It is the figure which showed typically the mode of the vortex generated by the protrusion of 7th Embodiment of this invention. It is the perspective view which saw through the principal part of the dust aggregation path of 8th Embodiment of this invention. It is a front view which shows the principal part of the dust aggregation path of 8th Embodiment. It is a figure which shows the side cross section of the dust aggregation path of 8th Embodiment. It is a figure which shows the shape (A) which looked at the protrusion of 8th Embodiment from the top, and the shape (B) seen from the side. It is the shape (A) which looked at a part of protrusion of 8th Embodiment from the side, and the figure (B) which projected the protrusion from the upstream of the airflow to the downstream. It is the perspective view which saw through the principal part of the dust aggregation path of 9th Embodiment. It is a front view which shows the principal part of the dust aggregation path of 9th Embodiment. It is a figure which shows the side cross section of the principal part of the dust aggregation path of 9th Embodiment. It is the perspective view which saw through the principal part of the dust aggregation path of 10th Embodiment. It is a front view which shows the principal part of the dust aggregation path of 10th Embodiment. It is a figure which shows the side cross section of the dust aggregation path of 10th Embodiment. It is a figure which shows typically the other arrangement | sequence of the protrusion concerning 10th Embodiment. It is a figure which shows typically the other arrangement | sequence of the protrusion concerning 10th Embodiment. It is a figure which shows typically the other arrangement | sequence of the protrusion concerning 10th Embodiment. It is a figure which shows typically the other arrangement | sequence of the protrusion concerning 10th Embodiment. It is a figure which shows typically the other arrangement | sequence of the protrusion concerning 10th Embodiment. It is a figure which shows arrangement | positioning of the adjacent protrusion in the dust aggregation path of 10th Embodiment. It is the perspective view which saw through the principal part of the dust aggregation path of 11th Embodiment. It is a front view which shows the principal part of the dust aggregation path of 11th Embodiment. It is a figure which shows the side cross section of the dust aggregation path of 11th Embodiment. It is a figure which shows the whole vacuum cleaner provided with the dust aggregation path of this invention. It is explanatory drawing of a structure of the main body of a vacuum cleaner provided with the dust aggregation path of this invention. It is a schematic diagram for demonstrating the mode of the airflow near the entrance of a flow path. It is a schematic diagram for demonstrating the mode of the airflow near the entrance of a flow path in the flow path which formed the rounded part which rounded the end surface in the entrance end surface of the flow path. It is a figure which shows the general outline of the vacuum cleaner provided with the dust aggregation path of this invention. It is a figure which shows the general outline of the conventional vacuum cleaner provided with the cyclone dust collection chamber as a control machine. It is a figure which shows the general outline of the vacuum cleaner provided with the dust aggregation path of this invention. The relationship between the size and number of particles contained in exhaust gas is shown for a conventional vacuum cleaner provided with a cyclone dust collection chamber and a vacuum cleaner provided with a cyclone dust collection chamber and provided with a dust aggregation passage of the present invention. FIG. Reduction rate (%) of particles contained in exhaust gas and pressure loss with respect to a conventional vacuum cleaner provided with a cyclone dust collection chamber and a vacuum cleaner provided with a cyclone dust collection chamber and provided with a dust aggregation passage of the present invention It is a figure which shows the relationship with (Pa). The relationship between the size and number of particles contained in exhaust gas is shown for a conventional vacuum cleaner provided with a cyclone dust collection chamber and a vacuum cleaner provided with a cyclone dust collection chamber and provided with a dust aggregation passage of the present invention. FIG.

Explanation of symbols

10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110: dust aggregation path, 11, 21, 31, 41, 51, 61, 71, 81, 91, 101, 111: flow path , 12, 22, 32, 42, 52, 62, 72, 82, 92, 102, 112: wall, 13, 23, 33: turning part, 13a, 13b, 13c, 13d, 23a, 23b, 23c, 23d: Surface, 43, 53, 63a, 63b, 63c, 63d, 73a, 73b, 83, 93, 103, 113: Protrusion, 501: Suction port, 502: Extension pipe, 561: Dust collector, 567: Electric blower.

Claims (9)

A flow path through which gas flows;
A wall forming the flow path;
A projection for generating a vortex in the gas flowing through the flow path,
The protrusions are formed to protrude from the inner surface of the wall so as to make the velocity of the gas passing around the protrusions non-uniform, and a plurality of the protrusions are arranged along the direction of gas flow in the flow path so that the gas flows. Are arranged in a plane perpendicular to the direction ,
The protrusions are arranged such that at least a part of each of the protrusions overlaps the other protrusions when the protrusions are projected from the upstream side to the downstream side of the flow path.
A dust aggregating path, wherein an upstream end portion of the protrusion located on the downstream side of the airflow is disposed upstream of a downstream end portion of the protrusion located on the upstream side . The protrusion has a first protrusion that positively contacts and charges dust contained in the gas flowing through the flow path, and a second protrusion that negatively charges dust contained in the gas flowing through the flow path. The dust aggregation path according to claim 1, wherein the first protrusion and the second protrusion are disposed so as to face each other. The dust projection path according to claim 2, wherein the protrusion is made of the same material as the wall. Said projection has a height from the wall, is one eighth or less of the characteristic length of the cross section perpendicular to the direction in which the gas of the flow path flows, any one of claims 1 to 3 The dust agglomeration path described in 1. The protrusion has a height from the wall that is equal to or less than a quarter of a representative length of a cross section perpendicular to the flow direction of the gas in the flow path, and the end surface of the protrusion is rounded. The dust aggregation path according to any one of claims 1 to 4 , wherein a rounded portion is formed. The dust aggregation path according to any one of claims 1 to 5 , wherein the protrusion is disposed at a position where there is no contraction in the flow path. The projection is in said flow path, from the inlet of the channel, are arranged at four times the distance between each position of the representative length of a cross section of the channel, any of claims 1 to 6 The dust aggregation path according to claim 1. The inlet end face of the flow path, rounded portion of the end surface thereof is rounded is formed, the projections are disposed near the entrance of the channel, any one of claims 1 to 6 The dust agglomeration path described in 1. An electric blower,
A ventilation path communicating with the electric blower from the suction port;
A dust collecting part,
In a vacuum cleaner that sucks dust from the suction port by an air flow generated by the electric blower, and collects dust passing through the ventilation path in the dust collecting portion.
The vacuum cleaner in which the said ventilation path has a dust aggregation path of any one of Claim 1-8 .

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