JP4137155B2 - Dust condensing path and vacuum cleaner - Google Patents

Description

  The present invention relates to a dust aggregation path 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.

A dust aggregation path according to the present invention includes a flow path through which a gas containing dust flows, a friction charging path disposed in the flow path for frictionally charging the dust, and a friction charging path disposed in the flow path. the charged dust each other to collide with a collision promoting pathway for promoting formation of dust masses (clusters), the triboelectric charging path, by frictional charging action, first to positively charged contact or collision with dust 1 friction charging unit and a second friction charging unit that negatively charges the contacted or collided dust by the friction charging action , and the first friction charging unit and the second friction charging unit are arranged to face each other. The collision promoting path is formed of a material that is less likely to transfer charges even if dust particles contact or collide with the wall surface, compared to the friction charging path, and further downstream of the friction charging path. It is provided on the side

In the frictional charging path, the first frictional charging unit for positively charging the dust and the second frictional charging unit for negatively charging the dust are arranged to face each other to form a wall of the dust aggregation path.
  Since the frictional charging path is formed of a functional material that can charge the particles, the dust particles are charged by contacting the wall with the dust particles, and effective using the Coulomb force generated between the charged dust. Improve the collision probability of dust particles.
  In this way, the collision probability between particles is increased in the triboelectric charging path. Increase the probability of contact with the inner wall surface, and increase the number of charged particles and the amount of charged particles.
  In the collision promoting path, the dust particles are effectively stirred, the collision probability is increased, and all the dust particles charged in the friction charging path are aggregated. The collision promoting path is formed of a material that hardly generates charges even when particles collide with the wall surface.
  Some particles charged in the frictional charging path do not collide with each other until reaching the collision promoting path. 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 also decreases. For this reason, the collision promoting path is provided as a dust aggregation path that is not formed of a functional material that easily charges particles, thereby increasing the collision probability of the charged particles in the friction charging path and further promoting the aggregation of the particles. .
  In this way, it is possible to efficiently generate agglomeration by creating a charged state of particles and causing them to collide more effectively.

In the dust aggregation path according to the present invention, the friction charging path has a first friction charging portion formed of the first material and a second friction charging portion formed of the second material. The collision promoting path is formed of the third material, the contact potential of the first material is greater than the contact potential of the third material, and the contact potential of the third material is greater than the contact potential of the second material. Larger is preferred .

A substance with a higher contact potential has a stronger ability to take electrons from another substance when it comes into contact with another substance. That is, a substance having a high contact potential is likely to be negatively charged, and the contact partner is easily positively charged. On the other hand, a substance having a lower contact potential is more likely to be deprived of electrons by another substance when it comes into contact with the other substance. That is, a substance having a low contact potential is easily positively charged, and the contact partner is easily negatively charged.
Therefore, in this way, even when there are restrictions on the material selection of the dust aggregation path, the material having three different contact potentials is selected and the contact potential is considered to have the above magnitude relationship. If comprised, the dust aggregation path | route with high dust aggregation efficiency compared with the past can be obtained.
In this way, a dust agglomeration path that can increase the number of collisions between particles in dust and promote aggregation by reducing the number of particles and increase the apparent particle diameter with a simple structure is provided. be able to.

  In the dust aggregation path according to the present invention, the friction charging path includes a first friction charging portion formed of a material having a large contact potential with respect to predetermined dust flowing in the flow path, and the flow path. And a second frictional charging portion formed of a material having a small contact potential with respect to the predetermined dust flowing, and the collision promoting path has substantially the same contact potential with respect to the dust flowing through the flow path. It is preferable that it is formed of a material having it.

  By doing so, dust made of a specific substance can be effectively aggregated and clustered into a large dust lump, so that a dust aggregating path with extremely high agglomeration efficiency can be obtained compared to the conventional case. .

  In the dust aggregation path according to the present invention, the friction charging path is formed of a material having a contact potential larger than that of the dust having the maximum contact potential among the plurality of dusts flowing through the flow path. A collision promoting path, comprising: a friction charging portion; and a second friction charging portion formed of a material having a contact potential smaller than that of dust having a minimum contact potential among a plurality of dusts flowing in the flow path. Is preferably made of a material having substantially the same contact potential with respect to the average contact potential of dust flowing in the flow path.

  By doing so, dust composed of a plurality of substances can be effectively aggregated and clustered into a large dust mass, so that it is possible to obtain a dust aggregation path with extremely high agglomeration efficiency as compared with the prior art. .

  In addition, in this way, even when the composition of the dust to be aggregated is unknown, the dust can be effectively aggregated and clustered into a large dust mass. A high dust aggregation path can be obtained.

  In the dust aggregation path according to the present invention, it is preferable that the frictional charging path has a wall that forms the frictional charging path, and a protrusion is formed on the inner surface of the wall.

  By doing so, it is possible to agitate the airflow in the friction charging path and increase the contact probability between the dust and the friction charging portion, and to increase the number of dust to be charged and the charge amount of the dust.

  In the dust aggregation path according to the present invention, it is preferable that the collision promoting path has a wall that forms the collision promoting path, and a protrusion is formed on the inner surface of the wall.

  By doing in this way, dust can be collided effectively.

In the dust aggregation path according to the present invention, the protrusion is preferably formed so as to be able to generate a vortex in the gas flowing on the downstream side of the protrusion.
By doing in this way, all the particles collide by the effect | action of a vortex, and a dust lump (cluster) can be formed effectively.

The vacuum cleaner according to the present invention includes an extension pipe, a connecting portion, and any one of the above-described dust aggregation paths, the friction charging path is arranged in the extension pipe, and the collision promoting path is arranged in the connecting section. It is preferred that The vacuum cleaner according to the present invention includes a connecting pipe having a handle, a connecting portion, and any one of the above-described dust aggregation paths, the friction charging path is disposed in the connecting pipe, and the collision promoting path is It is preferable to arrange in the connecting part.
By doing so, the average size is increased 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. can do.

  As described above, according to the present invention, with a simple structure, dust is charged, the number of collisions between particles in the dust is increased to promote aggregation, the number of particles is reduced, and the apparent particle diameter is increased. It is possible to provide a dust aggregation path that can be used.

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

  2 to 5 are diagrams for explaining that dust is charged and aggregated by the friction charging portion of the friction charging path according to the embodiment of the present invention.

  FIG. 2 is a diagram for explaining the configuration of the first and second frictional charging portions of the frictional charging path as one embodiment of the present invention.

  As shown in FIG. 2, the first friction charging unit 10 and the second friction charging unit 11 have a half-pipe shape in which a cylindrical tube is divided into two in the axial direction. The first frictional charging unit 10 is made of a material that easily charges dust positively. The second frictional charging unit 11 is formed of a material that easily charges dust negatively. This half-pipe shape can be appropriately deformed depending on the charging performance and the function of the components.

  FIG. 3 is a diagram for explaining assembly of the first and second frictional charging portions of the frictional charging path as one embodiment of the present invention.

  As shown in FIG. 3, when the first triboelectric charging unit 10 and the second triboelectric charging unit 11 shown in FIG. 2 are combined, it can be combined with the triboelectric charging path 12 shown in FIG. It becomes possible to flow. A plane perpendicular to the one joining surface 13 and the other joining surface 14 of the first friction charging unit 10 and the second friction charging unit 11 in which the friction charging path 12 is formed is referred to as an AA ′ cross section.

  4 is a cross-sectional view of the triboelectric charging path shown in FIG. 3 as seen from the direction of the line AA ′.

  FIG. 4 illustrates a model in which fine dust is charged according to the present invention. Hereinafter, the charged state of dust will be described with reference to FIG.

  When an air flow is generated in the frictional charging path 12, fine dust 15A, fine dust 16A, and fine dust 17A of about several microns are conveyed from the inlet 18 to the outlet 19 of the ventilation path 12 as dust. When the fine dust 15A is conveyed near the first frictional charging unit 10 and comes into contact with the first frictional charging unit 10, the fine dust 15A is positively charged by the frictional charging action. Further, when the fine dust 17A is conveyed near the second frictional charging unit 11 and comes into contact with the second frictional charging unit 11, the fine dust 17A is negatively charged by the frictional charging action. The fine dust 15A positively charged in this way is mixed with the negatively charged fine dust 17A in the ventilation path 12, and is attracted to each other by electrostatic force to form a dust lump 19A. By appropriately setting the shape of the ventilation path 12 and the charging unit to be long, the dust mass 19A comes into contact with the first friction charging unit 10 and the second friction charging unit 11 again and is further charged. In this way, the fine dust 15A, the fine dust 17A, and the dust lump 19A are repeatedly charged and adsorbed, so that the size of the dust lump 19A is further increased. In FIG. 3, the first friction charging unit 10 or the second friction charging unit 11 and fine dust are illustrated so as to perform one-time adsorption in one collision, but the length and diameter of the ventilation path 12 are appropriately set. By doing so, a plurality of contacts can be performed. Further, by appropriately selecting the material, it is possible to select and set the charge amount when the fine dust 15A, the fine dust 17A, the first friction charging unit 10 and the second friction charging unit 11 are in contact with each other.

  FIG. 5 is a diagram showing a model in another case where a dust mass is formed according to the present invention.

  As shown in FIG. 5, the fine dust 15B and the fine dust 17B that are in contact with the first friction charging unit 10 and the second friction charging unit 11 in the same manner as in FIG. Furthermore, a larger dust lump (cluster) 19B is formed by suction with fine dust 16B floating in the vicinity and not charged or slightly charged with air.

  The friction charging path of the present invention includes the first and second friction charging portions described above.

  Next, dust aggregation in the collision promoting path according to the embodiment of the present invention will be described.

  FIG. 6 is a diagram schematically illustrating how particles aggregate when the airflow in the flow channel has a laminar flow velocity distribution.

  As shown in FIG. 6, the gas P flows in 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. 7 is a schematic diagram showing the influence 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. 7, 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. 8 is a schematic diagram showing the effect 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. 8, 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 channel 1 and particles having a large diameter near the wall 2 of the flow channel 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.

  The dust aggregating path of the present invention is used to promote the formation of a dust mass (cluster) by colliding the friction charging path for frictionally charging the dust and the dust charged in the friction charging path as described above. A collision promoting path.

  In the dust aggregation path according to the present invention, the first frictional charging portion made of the first material having a sufficiently large contact potential with respect to dust and a contact potential sufficiently small with respect to the dust is formed. The frictional charging path formed by arranging the second frictional charging unit made of the second material in parallel is conveyed from the upstream side to the downstream side by an air flow.

  As a result, the dust that collides and contacts the first frictional charging unit made of the first material is deprived of electrons by the first material having a higher contact potential, has a positive charge, and is therefore positively charged. Also, the dust that collides and contacts the second frictional charging unit made of the second material takes electrons from the second material having a lower contact potential, has a negative charge, and is therefore negatively charged.

  The positively charged dust and the negatively charged dust grow into dust particles (small clusters) while adsorbing uncharged dust, and the dust particles (small clusters) having opposite charges are , They collide with each other by Coulomb force (attractive force) and grow into a larger dust mass (large cluster).

  This is the dust aggregation effect obtained by the above configuration. As a result, dust that has grown in clusters into larger dust masses is more efficiently separated or collected by, for example, a centrifuge or filter provided further downstream of the flow path than dust that has not been clustered.

  At this time, if the flow velocity of the air stream carrying the dust increases, the inertial force becomes dominant over the Coulomb force acting on the dust mass, and the dust or dust mass collides even though the dust is sufficiently charged. There is a concern that it is difficult to contact, or that dust or dust particles do not grow to a certain extent because they do not collide more than a certain amount.

  In order to effectively solve this problem, it is only necessary to generate vortices or turbulence in the airflow and increase the number of times of collision contact between dust or dust particles. For example, it is conceivable to provide a collision promoting path provided with a collision promoting part (for example, a projection made of a strong vortex) on the further downstream side of the friction charging path.

  However, at this time, if the path between the frictional charging path and the collision promoting path is bent or has a sufficiently long distance, the collision promoting part (for example, a projection made of a protrusion that generates a strong vortex on the downstream side) The following disadvantages arise if the material is selected easily.

  For example, when the collision promoting portion made of the first material is provided further downstream of the friction charging path, the first material has a property of taking electrons from dust as described above.

  Therefore, for example, a collision accelerating portion in which the dust that has not yet been charged or the dust that has no charge and is neutralized by collision aggregation between positively and negatively charged dust is formed of the first material. Since the collision promoting portion is made of the first material, the dust or the dust lump is positively charged when the dust or the dust lump collides with the collision promoting portion.

  For example, if dust or dust particles that have already been positively charged collide with and collide with the collision promoting portion made of the first material, the collision promoting portion is made of the first material. Increasingly, the dust or dust mass is augmented with a positive charge to take more electrons from the mass. Alternatively, when the dust or dust mass is already positively charged to the saturation point, there is no exchange of electrons between the collision promoting portion and the dust or dust mass.

  For example, if dust or a dust mass that has already been negatively charged collides with and comes into contact with the collision promoting portion made of the first material, the collision promoting portion is made of the first material, and thus becomes negatively charged. Take away electrons from the dust or dust mass and reduce the amount of negative charge by neutralizing the charge of the dust or dust mass, resulting in a smaller negative charge or even more When electrons are taken away, they can be positively charged.

  In such a case, the number of dusts or dust particles passing through the collision promoting portion having a positive charge increases, and the number of those having a negative charge decreases.

  By the way, dust or dust particles having positive charges repel each other due to repulsive force, and aggregation due to collision is inhibited. Therefore, the number of dusts or dust particles having positive charges that pass through the collision promoting portion increases. However, if the number of negatively charged objects decreases and the proportion of dust or dust that has positive charges as a whole increases, the result is that the dust or dust particles that were initially expected may collide with each other. On the contrary, the aggregation effect is impaired.

  Further, even if the collision promoting portion is made of a material having a contact potential that is not as large as that of the first material, if the collision promoting portion is made of a material having a contact potential larger than dust, Demerits close to

  Similarly, when the collision promoting portion made of the second material is provided further downstream of the friction charging path, the second material has the property that electrons are deprived by dust as described above. is there.

  Therefore, for example, a collision accelerating portion in which the dust that has not yet been charged or the dust that has no charge due to the collision aggregation between the positively and negatively charged dusts and has no charge is formed of the second material. Since the collision promoting portion is made of the second material, the dust or the dust lump is negatively charged when the dust or the dust lump collides with the collision promoting portion.

  For example, if dust or dust particles that have already been negatively charged collide with and come into contact with the collision promoting portion made of the second material, the collision promoting portion is made of the second material. Increasingly the dust or dust mass is augmented with a negative charge, as more electrons are taken away by the mass. Alternatively, when the dust or dust mass has already been negatively charged to the saturation point, there is no exchange of electrons between the collision promoting portion and the dust or dust mass.

  For example, if dust or dust particles that have already been positively charged collide with the collision promoting portion made of the second material, the collision promoting portion is made of the second material, and thus positively charged. Electrons are taken away by the dust or dust mass, reducing the amount of positive charge by neutralizing the charge of the dust or dust mass, resulting in a smaller positive charge of the dust or dust mass, or Further, when taking away electrons, it may be negatively charged.

  In such a case, the number of dusts or dust particles passing through the collision promoting portion having a positive charge increases, and the number of those having a negative charge decreases.

  By the way, dust or dust particles having negative charges repel each other due to repulsive force, and aggregation due to collision is inhibited. Therefore, the number of dusts or dust particles having negative charges that pass through the collision promoting portion increases. However, if the number of positively charged objects decreases and the proportion of dust or dust that has negative charges as a whole increases, the result is that the dust or dust particles that were initially expected may collide with each other. On the contrary, the aggregation effect is impaired.

  Also, even if the collision promoting portion is made of a material that has a contact potential that is not as small as that of the second material, if the collision promoting portion is made of a material that has a contact potential smaller than dust, Demerits close to

  In addition, the dust or dust mass that is frictionally charged by the frictional charging path installed on the upstream side is generally difficult to manage and has a charge because its trajectory is left to flow while flowing downstream. If it is difficult to prevent the dust or dust lump from colliding with the collision promoting part, or if a new device is added to prevent the collision promoting part from colliding with the collision promoting part, this time, the collision promoting part provided on the downstream side As a result, vortices and turbulence are generated in the airflow, and the number of collision contacts between dust or dust particles cannot be sufficiently increased.

  Therefore, the material of the collision promoting portion provided in the collision promoting path is configured by a third material having substantially the same contact potential with respect to dust.

  By doing in this way, exchange of electrons can be suppressed at the time of a collision with a collision promotion part and dust or a dust lump. Thereby, it is possible to promote the collision between the dust or the dust lump charged positively and negatively in a well-balanced manner by the frictional charging path provided on the upstream side of the collision promoting path, with almost no change in the charge amount, The dust aggregation effect can be further enhanced.

  As a result, dust or a dust lump can be clustered and grown into a larger dust lump, so that, for example, a centrifuge or filter provided further downstream of the flow path than the case where the collision promoting path is not circulated. Therefore, it is possible to separate or collect dust more efficiently.

  If the path between the frictional charging path and the collision promoting path is not bent and the distance is sufficiently short, the same two types of materials as the frictional charging path are selected as the material for the collision promoting part. The collision promoting portion provided immediately downstream of the first friction charging portion made of the first material is also made of the first material, and is provided immediately downstream of the second friction charging portion made of the second material. Since the collision promoting portion is also made of the second material, the dust or dust mass can be clustered and grown into a larger dust mass. For example, a centrifuge or filter provided further downstream of the flow path Therefore, separation or dust collection can be performed more efficiently.

  FIG. 9 is a diagram showing a charge train representing the ease of charging of a substance.

  As shown in FIG. 9, the substances listed in the charging row table have a higher contact potential toward the right side of the table, that is, they tend to be negatively charged and easily charge the contact partner positively. On the other hand, the contact potential is lower toward the left side of the charge column table, that is, it is easy to charge positively, and the contact partner side is easily charged negatively.

  Therefore, in the friction charging path and the collision acceleration path of the present invention, the material on the right side of the charging train shown in FIG. 9 is used as the material having a large contact potential, and the charging train shown in FIG. The material on the left side of can be used.

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

(Embodiment 1-1)
FIG. 10: is a figure which shows the whole vacuum cleaner provided with the dust aggregation path | route of this invention as Embodiment 1-1 of this invention.

As shown in FIG. 10, the electric vacuum cleaner 6 b includes an extension pipe 502, a suction hose 504, and a connecting portion 505 as flow paths. The extension pipe 502, the suction hose 504, and the connecting portion 505 are connected in order. The vacuum cleaner 6b includes a friction charging path 161 having a length b on the downstream side of the distance c from the upstream end of the extension pipe 502 having a length a, and a connecting portion 505 on the downstream side having a length d. A collision promoting path 162 is provided. In the friction charging path 161, a first friction charging unit that positively charges dust and a second friction charging unit that negatively charges dust are arranged to face each other to form a wall of the dust aggregation path.

  Since the frictional charging path 161 is formed of a functional material capable of charging the particles, the dust particles are charged when the dust particles come into contact with the wall surface, and the effect is obtained by using the Coulomb force generated between the charged dust. In particular, the collision probability of dust particles is improved.

  In this way, in the triboelectric charging 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.

  In the collision promoting path 162, the dust particles are effectively stirred, the collision probability is increased, and all the dust particles charged in the friction charging path 161 are aggregated. The collision promoting path 162 is formed of a material that hardly generates charges even when particles collide with a wall surface.

  Some particles charged in the frictional charging path 161 do not collide with each other before reaching the collision promoting 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, the collision promotion path 162 is provided as a dust aggregation path that is not formed of a functional material that easily charges particles, thereby increasing the collision probability between the charged particles in the friction charging path 161 and further aggregating the particles. Promote.

  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 collision promoting path 162 is formed of a functional material that has the effect of newly charging dust particles charged to any polarity in the friction charging path 161, the dust particles are charged to the same polarity by the friction charging path 161 and the collision promoting path 162. In this case, the charge amount of the particles is further increased, and a stronger Coulomb force can be generated. However, when the dust particles are charged to different polarities by the friction charging path 161 and the collision promoting path 162, the charge of the particles is increased. Is neutralized.

  As another example of neutralizing the charge of particles, functional materials that positively charge particles and functional materials that negatively charge particles are alternately arranged at equal intervals in the direction in which airflow flows in the flow path. However, the swirling flow of the entire flow path with the protrusion near the center of the flow path may be 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 collision promoting path 162 is formed of a material that is less likely to transfer charges, and in the collision promoting path 162, without neutralizing the charging of the dust particles given by the frictional charging path 161, When all particles collide with each other by the action of the vortex formed in the collision promoting path, a dust mass (cluster) can be effectively formed.

  The friction charging path, which is the upstream portion of the dust aggregation path, is formed by arranging a first friction charging section made of the first material and a second friction charging section made of the second material in parallel. Is done.

  The collision promoting path includes a collision promoting unit made of a third material.

  The contact potentials of the first material, the second material, and the third material are set such that the first material> the third material> the second material.

  For example, if there is a restriction that only three types of materials, polyethylene, polystyrene, and nylon must be selected, the first material is polyethylene (PE), the second material is polystyrene (PS), and the third material By using a combination of materials such as nylon (polyamide), the effects of the present invention can be obtained relatively well.

  As a result, even when there are restrictions on the selection of the material for the dust aggregation path, if materials having three different contact potentials are selected and the contact potentials are considered to have the above magnitude relationship, In comparison, a dust aggregation path with high aggregation efficiency can be obtained.

  As described above, the dust aggregation path is disposed in the extension pipe 502 through which the gas containing dust flows, the friction charging path 161 disposed in the extension pipe 502 to frictionally charge the dust, and the connecting portion 505. A collision promoting path 162 is provided for causing dust charged in the friction charging path 161 to collide with each other to promote the formation of a dust mass (cluster). The friction charging path 161 is formed of a first material. A first friction charging portion and a second friction charging portion formed of the second material, the collision promoting path is formed of the third material, and the contact potential of the first material is the third material. The contact potential of the third material is greater than the contact potential of the second material.

  In this way, even when there are restrictions on the material selection of the dust aggregation path, the material having three different contact potentials should be selected and the contact potential should be considered so as to have the above magnitude relationship. Thus, it is possible to obtain a dust aggregation path with higher dust aggregation efficiency than in the past.

  In this way, a dust agglomeration path that can increase the number of collisions between particles in dust and promote aggregation by reducing the number of particles and increase the apparent particle diameter with a simple structure is provided. be able to.

(Embodiment 1-2)
FIG. 11 is a diagram illustrating the entire vacuum cleaner including the dust aggregation path of the present invention as Embodiment 1-2 of the present invention, and FIG. 12 is an explanatory diagram of the configuration of the main body of the vacuum cleaner of the present invention. It is.

  The difference between the embodiment 1-2 and the embodiment 1-1 is that the frictional charging path is arranged inside the connecting pipe. Other parts of the embodiment 1-2 are the same as those of the embodiment 1-1.

  As shown in FIGS. 11 and 12, in the vacuum cleaner 500, the suction port 501 includes an extension tube narrow side 511, an extension tube thick side 512, a connection tube 503 having a handle 503a, and a foldable suction hose 504 in this order. It is connected and connected to the cleaner body 506 via the connecting portion 505. 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.

  11 and 12, the flow of air containing dust is indicated by arrows. When the electric blower 567 is driven, air is sucked from the suction port 501, and dust-containing air passes through the extension tube narrow side 511, the extension tube thick side 512, the connection tube 503, the suction hose 504, and the connecting portion 505, and is cleaned. 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 large-sized dust 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. In addition, the side surface of the cleaner body 506 is provided with wheels 507 that are rotatably provided and support the cleaner body 506 on the floor surface 508 so as to be movable.

  The outer diameter of the extension tube narrow side 511 and the inner diameter of the extension tube thick side 512 are substantially equal, and the extension tube narrow side 511 is slid into the extension tube thick side 512 to expand and contract the entire length of the extension tube. Therefore, the user can perform cleaning in a state suitable for each person.

  In the electric vacuum cleaner 500, the frictional charging path is disposed inside the connecting pipe 503, and the collision promoting path is disposed inside the connecting portion 505.

  FIG. 13 is a view showing a cross section of a connecting pipe in which a frictional charging path is arranged.

  As shown in FIG. 13, the frictional charging path 200 is inserted so that the downstream side is covered with one end on the upstream side of the suction hose 504, and is inserted into the connecting pipe 503 from the upstream end. Here, the downstream end of the frictional charging path 200 is held inside the connection pipe 503 by a depth t from the downstream end of the connection pipe 503. By doing so, even if the suction hose 504 is bent downward, the degree of bending is limited by the downstream end of the connecting pipe 503, and the stress applied to the frictional charging path 200 is greatly relieved. Therefore, it is possible to increase the inner diameter of the friction charging path 200 or to make the friction charging path 200 have a double structure so that the pressure loss in the friction charging path 200 does not increase.

  In order to relieve the stress applied to the downstream end of the frictional charging path 200, the depth t may be increased, so that the connecting pipe 503 can be lengthened. However, since the movable part behind the handle 503a is separated from the handle 503a, the operability of the electric vacuum cleaner 500 is reduced. As a result of operation with various prototypes, the inventor has a depth t of 19 mm when the inner diameter of the connecting pipe 503 is 58 mm, the outer diameter of the frictional charging path 200 is 46 mm, and the inner diameter of the frictional charging path 200 is 42 mm. Thus, it has been found that the stress applied to the frictional charging path 200 can be sufficiently reduced. If the margin is reduced, the stress applied to the downstream end of the frictional charging path 200 is considerably relaxed even if the depth t is set to 12 mm.

  A groove 203c is formed along the outer periphery of the outer frame 203 of the frictional charging path 200, and the connection pipe 503 includes a holder 513 for holding the frictional charging path 200 therein. The holder 513 is fixed inside the connection pipe 503. The holder 513 is formed with a protrusion (convex portion) 513a, and the protrusion 513a has a shape that fits into the groove 203c. Therefore, the triboelectric charging path 200 is connected to the suction hose 504 and is held so as not to come out of the connecting pipe 503, and is rotatable in the circumferential direction.

  Further, since the downstream end of the friction charging path 200 is wrapped with the suction hose 504, the sealing performance is high, and the first charging unit 201, the second charging unit 202, and the outer frame 203 do not have to have a high adhesion structure. Air does not leak and ultrasonic welding or screwing is not necessary. For this reason, a profit rate can be improved by shortening the manufacturing time of the frictional charging path 200, improving the manufacturing efficiency, and reducing the manufacturing cost.

  FIG. 14 is a cross-sectional view of the connecting portion 505 according to Embodiment 1-2 of the present invention.

  As shown in FIG. 14, the outer frame 303 of the collision promoting path 300 is inserted so as to be covered with one end on the downstream side of the suction hose 504 and then inserted into the connecting portion 505 from the other end. Since the upstream end of the collision promoting path 300 is wrapped with the suction hose 504, the sealing performance is high and air does not leak (no ultrasonic welding or screwing is required). For this reason, a profit rate can be improved by shortening manufacturing time, improving manufacturing efficiency, reducing manufacturing cost, and the like.

  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 connecting portion 505, and the connecting portion 562, the dust collecting filter 564, and the connecting portion. 565, the fan 568, the electric motor main body 569, the HEPA filter 570, and the exhaust port 571 are blown. At this time, the dust contained in the intake air is charged and aggregated when passing through the frictional charging path 200 disposed inside the connection pipe 503. Since air containing fine dust and dust mass is conveyed while being mixed while being conveyed, contact, suction and adsorption are performed, and the dust mass according to the present invention grows larger.

  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.

  The friction charging path and the collision acceleration path in the above embodiment 1-1 and embodiment 1-2 may be the friction charging path and the collision acceleration path in the following embodiments 1-A to 1-C. .

Embodiment 1-A
When the dust to be agglomerated is made of a specific substance, the dust collecting apparatus sucks and collects the dust made of the specific substance, and sucks the dust together with the air, and the dust flows into the air, that is, the air flow. A path to be transported downstream, a drive source that communicates with the path and generates an air flow, a dust collecting unit that is disposed in the path, separates air and dust, and holds the dust, and air separated from the dust In the dust collector having a blow-off port for discharging the dust to the outside, a dust aggregating path for aggregating dust is arranged upstream of the dust collecting part of the path, and the upstream part of the dust aggregating path is a frictional charging path The downstream part forms a collision promotion path.

  The friction charging path, which is the upstream portion of the dust aggregation path, includes a first friction charging section made of a first material having a contact potential sufficiently large with respect to the contact potential of dust made of the specific substance, A second frictional charging portion made of a second material having a contact potential that is sufficiently smaller than the contact potential of dust made of a specific substance is arranged in parallel.

  The configuration of the first frictional charging unit includes a wall surface formed of a first material and a plurality of protrusions formed of the first material integrally projecting from the wall surface. The configuration of the second frictional charging unit includes a wall surface formed of the second material and a plurality of protrusions formed of the second material integrally projecting from the wall surface.

  The first friction charging unit and the second friction charging unit have the same shape and different materials. For example, both the first friction charging unit and the second friction charging unit have a shape having a plurality of protrusions on the inner wall of a shape obtained by cutting the cylinder in half in the axial direction, and these are joined at the cut surface. Thus, one tube is formed and a triboelectric charging path is formed.

  Further, the collision promoting path, which is the downstream part of the dust aggregation path, is integrally formed with a wall surface made of a third material having a contact potential substantially equivalent to the contact potential of dust made of the specific substance, and the wall surface. And a plurality of collision promoting portions formed of a third material that protrudes. The collision promoting portion is a protrusion formed of a third material, and has a shape in which a strong vortex is generated on the downstream side of the air flow.

  For example, when the dust to be aggregated is iron powder, for example, if the first material is polypropylene (PP), the second material is nylon (polyamide), and the third material is a combination of iron, the present invention An effect can be obtained.

  As a result, dust of a specific substance can be effectively agglomerated, clustered into large dust masses, and collected by the dust collection part, so that the dust aggregation path with extremely high dust collection efficiency compared to the past Can be obtained.

  As described above, in the dust aggregation path, the friction charging path is circulated in the flow path and the first friction charging portion formed of a material having a large contact potential with respect to predetermined dust flowing in the flow path. And a second frictional charging portion formed of a material having a small contact potential with respect to the predetermined dust, and the collision promoting path has substantially the same contact potential with respect to the dust flowing in the flow path. It is formed by the material.

  By doing so, dust made of a specific substance can be effectively aggregated and clustered into a large dust lump, so that a dust aggregating path with extremely high agglomeration efficiency can be obtained compared to the conventional case. .

  Further, in the dust aggregation path, the friction charging path has a wall that forms the friction charging path, and a protrusion is formed on the inner surface of the wall.

  By doing so, it is possible to agitate the airflow in the friction charging path and increase the contact probability between the dust and the friction charging portion, and to increase the number of dust to be charged and the charge amount of the dust.

  Further, in the dust aggregation path, the collision promoting path has a wall that forms the collision promoting path, and a protrusion is formed on the inner surface of the wall.

  By doing in this way, dust can be collided effectively.

Embodiment 1-B
In the case where the dust to be aggregated is composed of a plurality of substances, the present invention is a dust aggregation path that sucks and collects dust consisting of a plurality of substances, and this embodiment is configured with respect to the dust aggregation path of the first embodiment Different materials.

  That is, the triboelectric charging path, which is the upstream part of the dust aggregation path, is formed of the first material having a contact potential larger than that having the maximum contact potential among the dusts made of the plurality of substances. Formed by arranging in parallel a friction charging portion and a second friction charging portion made of a second material having a contact potential smaller than that having the minimum contact potential among the dusts made of the plurality of substances. Is done.

  The collision promoting path, which is the downstream part of the dust aggregation path, includes a wall surface made of a third material having substantially the same contact potential with respect to the average contact potential of dust composed of the plurality of substances, and the wall surface. A plurality of collision promoting portions formed of a third material protruding integrally are provided.

  For example, if the dust to be agglomerated is composed of a plurality of substances and is composed of, for example, human skin, cotton cotton dust, waste paper, for example, the first material is polypropylene (PP), The effect of the present invention can be obtained when the material of 2 is a combination of nylon (polyamide) and the third material is a resin containing glass fiber.

  As a result, dust consisting of multiple substances can be effectively agglomerated, clustered into large dust masses, and collected by the dust collection part. Can be obtained.

  As described above, in the dust aggregation path, the friction charging path is formed of a material having a contact potential larger than that of the dust having the maximum contact potential among the plurality of dusts flowing through the flow path. A charging portion and a second friction charging portion formed of a material having a contact potential smaller than dust having a minimum contact potential among a plurality of dusts flowing through the flow path, and the collision promoting path is It is formed of a material having substantially the same contact potential with respect to the average contact potential of dust flowing in the flow path.

  By doing so, dust composed of a plurality of substances can be effectively aggregated and clustered into a large dust mass, so that it is possible to obtain a dust aggregation path with extremely high agglomeration efficiency as compared with the prior art. .

  In addition, in this way, even when the composition of the dust to be aggregated is unknown, the dust can be effectively aggregated and clustered into a large dust mass, so that the aggregation efficiency is extremely high compared to the conventional case. A dust aggregation path can be obtained.

  Further, in the dust aggregation path, the friction charging path has a wall that forms the friction charging path, and a protrusion is formed on the inner surface of the wall.

  By doing so, it is possible to agitate the airflow in the friction charging path and increase the contact probability between the dust and the friction charging portion, and to increase the number of dust to be charged and the charge amount of the dust.

  Further, in the dust aggregation path, the collision promoting path has a wall that forms the collision promoting path, and a protrusion is formed on the inner surface of the wall.

  By doing in this way, dust can be collided effectively.

Embodiment 1-C
When the composition of the dust to be aggregated is unknown, the present embodiment is a dust aggregation path that sucks and collects dust composed of a plurality of substances, and this embodiment is configured with respect to the dust aggregation path of the first embodiment. The material is different.

  That is, the friction charging path that is the upstream portion of the dust aggregation path includes a first friction charging section that is made of the first material having the maximum contact potential among the materials that can be used for the friction charging path, and the friction charging path. Among the materials that can be used, the second frictional charging portion made of the second material having the minimum contact potential is arranged in parallel.

  Further, the collision promoting path which is the downstream part of the dust aggregation path has a wall surface made of a third material having an average contact potential of the contact potential of the first material and the contact potential of the second material, A plurality of collision promoting portions formed of a third material integrally projecting from the wall are provided.

  For example, if the first material is polytetrafluoroethylene, the second material is glass, and the third material is aluminum, the effects of the present invention can be obtained.

  As a result, even when the composition of the dust to be collected is unknown, the dust can be effectively aggregated and clustered into a large dust mass. Obtainable.

  As described above, in the dust aggregation path, the friction charging path is formed of a material having a contact potential larger than that of the dust having the maximum contact potential among the plurality of dusts flowing through the flow path. A charging portion and a second friction charging portion formed of a material having a contact potential smaller than dust having a minimum contact potential among a plurality of dusts flowing through the flow path, and the collision promoting path is It is formed of a material having substantially the same contact potential with respect to the average contact potential of dust flowing in the flow path.

  By doing so, dust composed of a plurality of substances can be effectively aggregated and clustered into a large dust mass, so that it is possible to obtain a dust aggregation path with extremely high agglomeration efficiency as compared with the prior art. .

  In addition, in this way, even when the composition of the dust to be aggregated is unknown, the dust can be effectively aggregated and clustered into a large dust mass, so that the aggregation efficiency is extremely high compared to the conventional case. A dust aggregation path can be obtained.

  Further, in the dust aggregation path, the friction charging path has a wall that forms the friction charging path, and a protrusion is formed on the inner surface of the wall.

  By doing so, it is possible to agitate the airflow in the friction charging path and increase the contact probability between the dust and the friction charging portion, and to increase the number of dust to be charged and the charge amount of the dust.

  Further, in the dust aggregation path, the collision promoting path has a wall that forms the collision promoting path, and a protrusion is formed on the inner surface of the wall.

  By doing in this way, dust can be collided effectively.

  The following Embodiment 2-1 to Embodiment 2-8 are applied to the friction charging path and the collision acceleration path of the embodiment shown above, respectively.

(Embodiment 2-1)
FIG. 15 is a perspective view of the essential part of the frictional charging path of the embodiment 2-1. FIG. 16 is a front view showing the essential part of the dust aggregation path of the embodiment 2-1, and FIG. It is a figure which shows the side cross section of the dust aggregation path of -1.

  As shown in FIGS. 15 to 17, in Embodiment 2-1 of the present invention, a plurality of protrusions 113 are provided on the inner surface of the wall 112 of the flow path 111. The protrusion 113 is formed by a triangular pyramidal protrusion having a length in the flow direction: JM = (1/4) D and a triangular pyramid height: NM = (1/16) D.

  According to the frictional charging path 110 of the embodiment 2-1, the protrusion 113 generates a twin vortex. The twin vortex generated by one protrusion 113 is weaker than the case where the protrusion is large, but since the number of protrusions 113 is set to be larger, a substantially similar disturbance can be given to the flow.

  When the size of the aggregated particles is concentrated in the micron order, the distribution density of the aggregated particles is particularly high at a position from the wall surface of the channel 111 having the diameter D to (1/8) D. Although the phenomenon is seen, the protrusions 113 arranged in a plurality of stages in the embodiment 2-1 are set to a height of (1/16) D, and therefore the flow in which the distribution density of the aggregated particles is particularly high. Of the positions at a distance from the wall 112 of the path 111 to (1/8) D, only about half of the regions can be actively disturbed.

  The protrusion 113 of Embodiment 2-1 has the following advantages. That is, the height of the protrusion 113 is set to (1/16) D, and the pressure loss is significantly reduced.

  Furthermore, since the height of the protrusion 113 of the embodiment 2-1 is set to (1/16) D, the twin vortex generated by the protrusion 113 develops on the wall 112 of the flow path 111 of the frictional charging path 110. The effect of reducing the boundary layer thickness is obtained by affecting the velocity boundary layer.

  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 has a slower wind speed than the central part of the flow path, and the region has a large resistance to flow. 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.

  The twin vortex generated by the protrusion 113 of the embodiment 2-1 has a small vortex scale and is generated closer to the wall surface portion. Therefore, the twin vortex generated by the protrusion 113 suppresses the development of the boundary layer, Therefore, 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 generation portion) <(boundary layer of the turbulence generation portion) Despite the presence of a large number of protrusions 113, the friction charging path 110 having a smaller pressure loss than the flow path without the protrusions was obtained.

  Further, even when foreign matter or the like is mixed in the fluid flowing through the frictional charging path 110, the protrusion 113 is low in height, so that the foreign matter is less likely to be caught.

  Therefore, if the friction charging path 110 of the embodiment 2-1 is used, the frictional resistance of the pipe can be further reduced while obtaining sufficient agglomeration performance by disturbance of a large number of twin vortices. It is possible to obtain the frictional charging path 110 reduced to a very low level. Further, for example, even when there is a possibility that foreign matter or the like may be mixed in the flow, the trouble that the foreign matter is caught by the protrusion 113 and can be almost completely prevented, so that the friction charging path 110 with extremely high reliability can be provided. Obtainable.

  Further, by forming a 1 mm radius on each side constituting the protrusion 113, it is possible to greatly reduce clogging. Furthermore, a dust aggregation path with good maintenance performance can be formed by eliminating the acute groove.

(Embodiment 2-2)
FIG. 18 is a perspective view of the essential part of the collision promoting path of the embodiment 2-2, FIG. 19 is a front view showing the essential part of the dust aggregation path of the embodiment 2-2, and FIG. 20 is the embodiment. It is a figure which shows the side cross section of the dust aggregation path of 2-2.

  As shown in FIGS. 18 to 20, in the collision promoting path 100 of the embodiment 2-2, a plurality of protrusions 103 are provided on the inner surface of the wall 102 of the flow path 101. Each projection 103 is formed by a triangular pyramidal projection. 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. 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.

  According to the collision promoting path 100 of the embodiment 2-2, a twin vortex is generated by the protrusion 103. However, since the number of the projections 103 is small and the projections 103 are arranged so as not to overlap each other when projected from the upstream side, most of the flow flowing along the wall 102 of the channel 101 is mostly the projection 103. The flow flowing through the protrusion 103 between the protrusion 103 and the protrusion 103 never meets the protrusion 103 once. Therefore, in the collision promoting path 100 of the embodiment 2-2, the disturbance that can be given to the flow is greatly reduced.

  However, the collision promoting path 100 of the embodiment 2-2 has an advantage that the molding method is extremely easy. That is, when projecting from the upstream side, the plurality of protrusions 103 do not overlap each other, and when projecting from the upstream side, the adjacent protrusions 103 are arranged at a predetermined interval. When the path 100 is resin-molded, the upstream side of the collision promoting path 100 is set to the movable side of the mold, the downstream side of the collision promoting path 100 is set to the fixed side of the mold, and the mold is complicated. Thus, the collision promoting path 100 can be molded integrally without requiring a mold configuration.

  Further, when a plate-like foreign material (for example, a milk cap, etc.) having the same area as the cross section of the channel 101 is mixed in the fluid flowing through the collision promoting path 100, the fluid is perpendicular to the flow direction. If a plurality of turbulence generating parts are arranged in the plane of the direction, the end of a plate-like foreign material having the same area as the cross section of the flow path is likely to be simultaneously caught by a plurality of protrusions. In the embodiment 2-2, the protrusions 103 are arranged in a plane perpendicular to the flow direction in which a plurality of protrusions 103 are not arranged, although there is a possibility that foreign matter is clogged inside the aggregation path. Therefore, a plate-like foreign material having an area comparable to the cross section of the flow channel 101 is not easily caught.

  Therefore, if the collision promoting path 100 of the embodiment 2-2 is used, the moldability is extremely good and, for example, a plate-like foreign substance having an area similar to the cross section of the flow path may be mixed in the flow. In such a case, it is possible to prevent in advance a problem that the foreign matter is caught by the turbulent generation part and clogged. In this way, it is possible to obtain a dust aggregation path having both extremely high formability and extremely high reliability.

  FIGS. 21 to 25 are diagrams schematically illustrating another arrangement of the protrusions according to the embodiment 2-2. (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. 21, a plurality of protrusions 103 are arranged on the periphery of the surface in the direction perpendicular to the flow direction. 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. 23, as shown in FIG. 23, the adjacent protrusions 103 are arranged so as to be slightly shifted so as not to overlap each other, and the foreign matter produced by the protrusions is prevented from clogging, and the similar effect is obtained. The protrusions are divided into several groups, and the groups are arranged so as to be shifted from each other in the flow path direction, and a sawtooth arrangement as shown in FIGS. 24 and 25 can be exemplified. All of these can provide extremely high moldability.

  FIG. 26 is a diagram illustrating the arrangement of adjacent protrusions in the dust aggregation path of the embodiment 2-2.

  As shown in FIG. 26, when the projections 103 are arranged so as not to 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 collision promoting 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.

(Embodiment 2-3)
FIG. 27 is a perspective view showing a main part of the frictional charging path and / or the collision acceleration path according to Embodiment 2-3 of the present invention, and FIG. 28 shows the essential part of the frictional charging path and / or the collision acceleration path according to Embodiment 2-3. FIG. 29 is a diagram showing a side cross-section of the frictional charging path and / or the collision promoting path of the embodiment 2-3.

  As shown in FIGS. 27 to 29, the frictional charging path and / or the collision promoting 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. 30 is a diagram schematically illustrating the gas flow around the protrusions in the frictional charging path and / or the collision acceleration path of the embodiment 2-3.

  As shown in FIG. 30A, the flow velocity V1 of the flow along the concave side surface of the projection 43 having a wing shape is blocked by the collision of the flow to the projection 43, and the fluid flowing in 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. 30 (B), when considering the relative speed around the projection 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. 31 is a diagram schematically showing vortices generated around the protrusions.

  As shown in FIG. 31, a strong horseshoe vortex V4 is generated from the wing tip 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 frictional charging path and / or the collision acceleration path 40 of the embodiment 2-3, the blade height h of the protrusion 43 is h = (1/8) D, and therefore the horseshoe vortex V4 immediately after the horseshoe vortex V4 is generated. The diameter depends on the flow velocity of the fluid flowing in the flow channel 41, but is (1/8) D or slightly larger than that. 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 frictional charging path and / or the collision promoting path 40, the protrusion 43 has a height that is one-eighth of the representative length of the cross section perpendicular to the direction in which the gas in the flow path 41 flows. As a result, the foreign matter is less likely to be caught on the protrusion 43.

  FIG. 32 is a diagram schematically showing the state of vortices generated by the protrusions according to Embodiment 2-3 of the present invention. FIG. 32A is a view of the flow path as viewed from the front, and FIG. 32B is a view of the flow path as viewed from the side.

  As shown in FIG. 32, in the triboelectric charging path and / or the collision promoting path 40, when the gas P flows into the flow path 41, projections 43 are equally spaced at six locations on the inner surface of the wall 42 of the flow path 41. Accordingly, six horseshoe vortices V4 in the same rotational direction are generated at substantially equal intervals in the vicinity of the inner surface of the wall 42 of the flow path 41. 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 frictional charging path and / or the collision promoting path 40, a 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. .

  Thus, in the triboelectric charging path and / or the collision promoting path 40, the vortex generating means includes the protrusion 43, and the protrusion 43 is formed on the wall 42 so as to make the velocity of the gas passing around the protrusion 43 uneven. It protrudes from the inner surface.

  By doing so, the dust flowing through the frictional charging path and / or the collision promoting path 40 is conveyed in the flow path 41 by the stage where the dust is guided into the flow path 41 by the air flow and the air flow in which the dust goes straight. A stage in which dust is entrained and circulated in a vortex generated downstream of the protrusion 43 protruding from the wall 42 of the flow path 41, a stage in which the plurality of dust collide with each other by the vortex, and a plurality of the collided dust A step of forming a lump (cluster) and a step of transferring a lump of dust through the flow path 41 by an air current are sequentially performed.

  In this way, the triboelectric charging path capable of increasing the number of collisions between particles in dust and promoting aggregation by reducing the number of particles and increasing the apparent particle size with a simple structure. A collision promoting path 40 can be provided.

(Embodiment 2-4)
FIG. 33 is a perspective view showing the main part of the frictional charging path and / or the collision acceleration path of the embodiment 2-4 of the present invention, and FIG. 34 shows the essential part of the frictional charging path and / or the collision acceleration path of the embodiment 2-4. FIG. 35 is a side sectional view showing a frictional charging path and / or a collision promoting path according to Embodiment 2-4.

  As shown in FIGS. 33 to 35, in the frictional charging path and / or the collision acceleration path 50 of the embodiment 2-4, a protrusion 53 is provided instead of the protrusion 43 of the embodiment 2-3. One protrusion 53 is formed by a wing-shaped protrusion having the same shape as the protrusion 43 of Embodiment 2-3, but the arrangement is different.

  In the frictional charging path and / or the collision promoting path 50, two protrusions 53 adjacent in the flow path direction are arranged in a stepped manner 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 frictional charging path and / or the collision acceleration path 50 of the embodiment 2-4 are the same as the friction charging path and / or the collision acceleration path 40 of the embodiment 2-3.

  In the frictional charging path and / or the collision acceleration path 50 of the embodiment 2-4, 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. A stronger horseshoe vortex V6 is generated. The vortex gradually attenuates as it moves downstream, but the vortex generated in the frictional charging path and / or the collision promoting path 50 has a stronger vortex strength than the vortex generated in the frictional charging path and / or the collision promoting path 40. Therefore, the distance (reach distance) until the vortex is attenuated is long, and the vortex can affect 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. 36 is a diagram schematically illustrating the flow of gas around the protrusions in the frictional charging path and / or the collision acceleration path of the embodiment 2-4.

  As shown in FIG. 36, since the two protrusions 53 are arranged stepwise, the horseshoe vortex V5 generated on the upstream side is taken in by the vortex generated by the downstream protrusion 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 triboelectric charging path and / or the collision acceleration path 50 of the embodiment 2-4 is used, a stronger vortex can be generated. Therefore, the reach distance of the vortex is long, and the collision probability of the fine dust carried by the flow is correspondingly increased. Since it is further enhanced, the dust aggregating ability is greatly enhanced. Further, since the friction of the flow is reduced as compared with the friction charging path and / or the collision acceleration path 40 of the embodiment 2-3, the pressure loss can be further reduced.

  In addition, according to the friction charging path and / or the collision promoting path 50 of the embodiment 2-4, the pressure loss is equal to that of the friction charging path and / or the collision promoting path 40 of the embodiment 2-3. Since the collision probability is improved by about 30% with respect to the frictional charging path and / or the collision promoting path 40 of the embodiment 2-3, according to the frictional charging path and / or the collision promoting path 50, a higher performance dust aggregation path can be provided. Obtainable.

Embodiment 2-5
FIG. 37 is a perspective view showing the main part of the frictional charging path and / or the collision acceleration path of Embodiment 2-5 of the present invention, and FIG. 38 shows the essential part of the frictional charging path and / or the collision acceleration path of Embodiment 2-5. FIG. 39 is a side sectional view showing the frictional charging path and / or the collision promoting path of the embodiment 2-5.

  As shown in FIGS. 37 to 39, in the frictional charging path and / or the collision promoting path 60 of Embodiment 2-5, instead of the protrusion 53 of Embodiment 2-4, a protrusion 63a, a protrusion 63b, a protrusion 63c, A protrusion 63d is provided. 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 frictional charging path and / or the collision acceleration path 60 of the embodiment 2-5, the horseshoe vortex similar to the protrusion 43 of the embodiment 2-3 is generated in each protrusion (63a, 63b, 63c, 63d). Since the horseshoe vortex moves downstream along the wall 62 of the flow path 61 on the downstream side, a strong swirl is given to the flow flowing downstream of the protrusion.

  FIG. 40 is a diagram schematically illustrating the state of vortices generated around the protrusions of the frictional charging path and / or the collision promoting path of the embodiment 2-5.

  As shown in FIG. 40, in the frictional charging path and / or the flow path 61 of the collision acceleration path 60 of the embodiment 2-5, the 12 protrusions are arranged so as to face each other alternately. . 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 Embodiment 2-5, the pressure loss by a vortex reduces compared with the flow path 51 of Embodiment 2-4.

  Thus, in the frictional charging path and / or the collision promoting path 60, the protrusions (63a, 63b, 63c, 63d) have a curved shape so as to form a recess, and a direction that intersects the gas flow direction. The two protrusions adjacent to each other are arranged so that the two recesses face 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 friction charging path and / or the collision acceleration path 60 of the embodiment 2-5 is used, the friction of the flow is reduced as compared with the friction charging path and / or the collision acceleration path 40 of the embodiment 2-3. Pressure loss can be further reduced. The collision probability of the fine dust due to the flow friction is reduced by about 5% with respect to the friction charging path and / or the collision promoting path 40 of the embodiment 2-3, but the pressure loss is the friction charging path of the embodiment 2-3. According to Embodiment 2-5, the friction charging path according to Embodiment 2-3 and / or the friction charging path with higher performance than the collision promotion path 40 is reduced. And / or a collision promoting path 60 can be obtained.

Embodiment 2-6
FIG. 41 is a perspective view of a main portion of the frictional charging path and / or the collision promoting path of the embodiment 2-6 of the present invention, and FIG. 42 is a perspective view of the frictional charging path and / or the collision of the embodiment 2-6. It is a front view which shows the principal part of a promotion path | route.

  As shown in FIGS. 41 and 42, in the triboelectric charging path and / or the collision promoting path 70 of the embodiment 2-6 of the present invention, the wall 72 of the flow path 71 is replaced with the protrusion 43 of the embodiment 2-3. A plurality of protrusions 73a and protrusions 73b are provided on the inner surface. The protrusion 73a and the protrusion 73b are protrusions having a triangular bottom surface.

  FIG. 43 is a diagram illustrating the protrusions of the embodiment 2-6. 43A is a bottom view of the protrusion, FIG. 43B is a side view of the protrusion, and FIG. 43C is a front view of the protrusion. The upstream side of the flow path is the front.

  As shown in FIG. 43, 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. 44 is a diagram schematically illustrating the state of airflow around the protrusions of the embodiment 2-6.

  As shown in FIG. 44, the flow velocity V9 of the flow along the oblique side GI of the protrusion 73a is blocked by the collision of the flow of the protrusion 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 Embodiment 2-6, 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 generation of the horseshoe vortex circulates inside the channel 71. Depending on the flow rate of the fluid, it is (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 a phenomenon in which the distribution density of the aggregated particles is increased is observed, the protrusion 73a and the protrusion 73b in the embodiment 2-6 are (1/8) from the wall 72 of the flow path 71 in which the distribution density of the aggregated particles is particularly increased. The gas passing through the position up to D is actively stirred by generating a horseshoe vortex.

  As described above, in the frictional charging path and / or the collision promoting path 70, the protrusion 73a and the protrusion 73b have a height of 1 from the wall 72, which is a representative length of a cross section perpendicular to the gas flow direction of the flow path 71. By being / 8, it becomes difficult for foreign matter to be caught on the projections 73a and 73b.

  FIG. 45 is a diagram schematically showing the state of vortices generated by the protrusions according to Embodiment 2-6 of the present invention. FIG. 45A is a view of the flow path as viewed from the front, and FIG. 45B is a view of the flow path as viewed from the side.

  As shown in FIG. 45, 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 the pressure loss due to the vortex is reduced in the frictional charging path and / or the collision acceleration path 70 of the embodiment 2-6.

  When rod-like foreign matters such as a length D and a thickness 0.05D are mixed in the fluid flowing through the flow channel 71, for example, when the shape of the projection of the dust aggregation path has a curved structure, Since the protrusion has a concave shape on the upstream side and a convex shape on the downstream side, if one end of a rod-like foreign object is caught by one vortex generating means and the other end of the rod-like foreign matter is caught by another vortex generating means, There is a possibility that a problem such as foreign matter clogging inside the aggregation path may occur. On the other hand, in the frictional charging path and / or the collision acceleration path 70 of the embodiment 2-6, the protrusion 73a has no recess, and for example, instead of the concave surface of the protrusion 43 of the embodiment 2-3, the protrusion 73a and the protrusion 73b have a hypotenuse. Since the surface is formed, rod-like foreign matters and the like as described above are not easily caught by the protrusions.

  Thus, in the frictional charging path and / or the collision promoting 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 friction charging path and / or the collision acceleration path 70 of the embodiment 2-6 is used, substantially the same effect as that of the embodiment 2-4 can be obtained, and the dust of the embodiment 2-3 to the embodiment 2-5 can be obtained. For example, when there is a possibility that a rod-like foreign material or the like may be mixed in the flow rather than the agglomeration path, it is possible to prevent problems such as a rod-like foreign material being caught by a turbulent occurrence part and being obstructed. A high dust aggregation path can be obtained.

  In addition, the shape of the protrusion of the friction charging path and / or the collision promoting path 70 of Embodiment 2-6 may be the shape of the protrusion shown in FIGS. 46 to 48.

  FIG. 46 is a perspective view of a main portion of a frictional charging path and / or a collision promoting path in which protrusions of another shape according to Embodiment 2-6 of the present invention are arranged, and FIG. 47 is a diagram illustrating the implementation of the present invention. FIG. 49 is a front view showing a main part of a frictional charging path and / or a collision promoting path in which protrusions of another shape according to mode 2-6 are arranged, and FIG. 48 shows another shape of embodiment 2-6 of the present invention. It is a figure which shows the side cross section of the triboelectric charging path | route and / or collision acceleration | stimulation path | route where the processus | protrusion is arrange | positioned.

  As shown in FIGS. 46 to 48, in the flow path 121 of the frictional charging path and / or the collision promoting path 120, the protrusion 123 is disposed on the inner surface of the wall 122 of the flow path 121.

(Embodiment 2-7)
FIG. 49 is a perspective view of the essential portions of the frictional charging path and / or the collision promoting path of the embodiment 2-7 of the present invention. FIG. 50 is the perspective view of the frictional charging path and / or the collision promoting of the embodiment 2-7. FIG. 51 is a side view of a friction charging path and / or a collision promoting path according to Embodiment 2-7.

  As shown in FIGS. 49 to 51, in Embodiment 2-7, a plurality of protrusions 83 are provided instead of the protrusion 73a and protrusion 73b of Embodiment 2-6. The protrusion 83 is a triangular pyramid-shaped protrusion.

  FIG. 52 is a diagram illustrating a shape (A) of the protrusions of Embodiment 2-7 viewed from above and a shape (B) viewed from the side.

  As shown in FIG. 52, the shape of the protrusion 83 is an isosceles triangle in which the base KL of the triangular pyramid is the base KL: height JM = 1: 2, and the minimum angle J of the base 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 triboelectric charging path and / or the collision promoting 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. Further, it is further arranged at a position shifted by (3/4) JM in the flow direction and (3/4) KL in the direction perpendicular to the flow with respect to 83, and a plurality of protrusions 83 are arranged in the flow direction (3 / 2) JM, set in an arrangement such that further (3/2) KL are arranged in the direction perpendicular to the flow. 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 and multi-stage arrangements are made in a so-called staggered arrangement.

  When these protrusions 83 are projected from the upstream side, the plurality of protrusions 83 are not completely overlapped with each other, and the adjacent protrusions 83 are disposed so as to overlap each other by a certain amount. Other parts are the same as those in the embodiment 2-4.

  According to the frictional charging path and / or the collision acceleration path 80 of the embodiment 2-7, the flow that circulates in the vicinity of the inner surface of the wall 82 of the flow path 81 is caused 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 with respect to the bottom surface of the triangular pyramid, wound up to the center side of the flow path, and generates a weak twin vortex downstream of the apex angle N. The flow flowing through the frictional charging path and / or the collision promoting path 80 of the embodiment 2-7 is disturbed by the weak twin vortex created by the projection 83 that meets first, and flows downstream and then weakly created by the projection 83 that meets next. It is disturbed one after another by the twin vortex, and further disturbed by the weak twin vortex created by the projection 83 that meets the next flow, and further downstream. 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. 5, the projections 83 arranged in a plurality of stages in the embodiment 2-7 have the wall surface of the flow path in which the distribution density of the aggregated particles is particularly high. To (1/8) D is actively disturbed by a plurality of twin vortices.

  As described above, in the frictional charging path and / or the collision promoting path 80, the protrusion 83 has a height from the wall 82 of 1/8 or less of the representative length of the cross section perpendicular to the gas flow direction of the flow path 81. As a result, the foreign matter is less likely to be caught 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 frictional charging path and / or the collision promoting path 80 while encountering the protrusion 83 again and again as it flows downstream.

  As described above, in the frictional charging path and / or the collision promoting 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 extends from the upstream side of the flow path 81. When the projections 83 are projected toward the downstream side, the projections 83 are arranged so that a part of the projections 83 overlap each other. 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.

  Therefore, in the frictional charging path and / or the collision acceleration path 80 of the embodiment 2-7, the most efficient is the airflow flowing through the position from the wall 82 of the flow path 81 to the distance of (1/8) D. It can be disturbed and the number of twin vortices generated can be increased.

  As described above, in the frictional charging path and / or the collision promoting 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 is downstream from the upstream side of the flow path 81. Since the projections 83 are arranged so that a part of each projection overlaps when projected toward the side, the gas flowing along the flow path 81 easily passes around the projection 83, and the vortex is efficiently vortexed. Can be generated.

  Further, the fluid flowing through the frictional charging path and / or the collision promoting path 80 is a cloth-like material made of, for example, a flexible material and has a foreign substance (for example, cloth-like or For example, if the shape of the projections of the dust aggregating path is a curved structure or a rectangle, mesh-like materials (such as handkerchiefs or pantyhose) are mixed, and the cloth-like foreign matter is vortex generating means. However, in the second to seventh embodiments, the protrusion 83 forms a smooth triangular pyramid protrusion on the upstream side of the flow, which may cause a problem that foreign matter is clogged inside the dust aggregation path. Therefore, the cloth-like foreign matters described above are not easily caught.

  Therefore, when the triboelectric charging path and / or the collision acceleration path 80 of the embodiment 2-7 is used, sufficient aggregation performance is obtained by disturbance of a large number of twin vortices, while the embodiment 2-3 to the embodiment 2-6. For example, when there is a possibility that a cloth-like foreign matter or the like may be mixed in the flow than the dust aggregation path, it is possible to prevent a trouble such as a cloth-like foreign matter being caught by the turbulent generation part and blocked. A highly reliable frictional charging path and / or collision acceleration path 80 can be obtained.

(Embodiment 2-8)
FIG. 53 is a perspective view of the essential part of the frictional charging path and / or the collision promoting path of the embodiment 2-8, and FIG. 54 is the essential part of the frictional charging path and / or the collision promoting path of the embodiment 2-8. FIG. 55 is a diagram showing a side cross-section of the main part of the frictional charging path and / or the collision promoting path of the embodiment 2-8.

  As shown in FIGS. 53 to 55, in the triboelectric charging path and / or the collision acceleration path 90 of the embodiment 2-8, a plurality of protrusions 93 are provided in the flow path 91 instead of the protrusion 83 of the embodiment 2-7. It is provided on the inner surface of the wall 92. Each protrusion 93 is formed of a triangular pyramid protrusion having the same shape as the protrusion 83 of Embodiment 2-7, and the arrangement or arrangement thereof is different. That is, in Embodiment 2-8, the number of protrusions 93 that is 1/3 of the number of protrusions 83 in Embodiment 2-7 is arranged to match the arrangement of protrusions 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 of the embodiment 2-7.

  According to the frictional charging path and / or the collision acceleration path 90 of the embodiment 2-8 of the present invention, the protrusion 93 generates a twin vortex substantially the same as the vortex generated in the protrusion 83 of the embodiment 2-7. 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 the protrusions 93 is 1/3 with respect to the protrusion 83 of the embodiment 2-7, the number of times that the flow flowing along the wall 92 of the flow channel 91 is disturbed and the protrusion 93 is encountered is also generated. The number of vortices is also reduced to 1/3, and the collision probability between the aggregated particles decreases.

  However, the protrusion 93 of Embodiment 2-8 has the following advantages. That is, in the triboelectric charging path and / or the collision promoting path 80 of Embodiment 2-7, a large number of protrusions 83 are arranged in a plane perpendicular to the flow direction, and the direction perpendicular to the flow direction. The area of the flow path 81 at the position ΔNKL of the projection 83 is smaller than the area of the flow path 81 at the position of the plane perpendicular to the other flow direction (direction perpendicular to the flow direction). The number of protrusions 83 arranged in the same plane in (1) × (area of the plane ΔNKL) is reduced. Therefore, the larger the number of protrusions 83 arranged in the same plane in the direction perpendicular to the flow direction, the larger the reduction width of the flow path area in that portion. The pressure loss increases. On the other hand, in the frictional charging path and / or the collision acceleration path 90 of Embodiment 2-8, as many projections 93 as possible are not arranged in the plane perpendicular to the flow direction, and are perpendicular to the flow direction. The plurality of protrusions 93 arranged in the same plane in the same direction are set so as to distant from each other as much as possible, so that the reduction of the flow path area at the position where the protrusions 93 are arranged is small. Therefore, the pressure loss of the friction charging path and / or the collision promoting path 90 is also reduced.

  That is, for example, the flow direction length of the flow path 91 of the embodiment 2-8 is set to 3 times, and the number of the protrusions 93 of the embodiment 2-8 is set to the number of the protrusions 83 of the embodiment 2-7. If set to be the same, the collision probability between the aggregated particles is almost the same as that of the frictional charging path and / or the collision promoting path 80 of the embodiment 2-7, but the flow path area at the position where the protrusion 93 is disposed is the same. The friction loss path and / or the collision acceleration path 90 in which the length is set to three times as much as the decrease width is smaller causes a smaller pressure loss.

  Therefore, if the frictional charging path and / or the collision acceleration path 90 of Embodiment 2-8 is used, a large pressure loss reduction effect can be obtained. For example, if the triboelectric charging path and / or the collision promoting path 90 set to three times the length is used, the particles to be aggregated collide with the triboelectric charging path and / or the collision promoting path 80 of the embodiment 2-7. The pressure loss can be reduced without impairing the agglomeration performance due to the pressure, so that when the output of the driving source (for example, fan, blower, etc.) that generates the flow flowing through the flow path 91 or the increase in static pressure is small, the driving source is pressure In the case of being vulnerable to loss, the performance of the entire system including the frictional charging path and / or the collision promoting path 90 and the driving source is improved.

  The shape of the protrusion of the present invention is not limited to the shape of the protrusion shown in the above embodiment. The shape of the protrusion may be a cylinder, a cone, a polygonal column, a polygonal pyramid, an elliptical cone, or the like.

  As one effect of the present invention, there is an effect of reducing the number of fine particles 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. 56 is a diagram showing an overall outline of a conventional vacuum cleaner provided with a cyclone dust collecting chamber as a control machine, and FIG. 57 is an overall view of the vacuum cleaner provided with the dust collecting passage of the present invention. FIG.

  As shown in FIG. 56, the tube length a of the extension pipe 502 of the conventional vacuum cleaner 6a is 700 mm for both the control machine and the vacuum cleaner provided with the dust collecting passage of the present invention. Was 35 mm, and the wind speed at the center of the tube was 20 m / sec.

  As shown in FIG. 57, in the vacuum cleaner 6b having the dust aggregation path of the present invention, a friction charging path 161 having a length b is formed at a position c from the tip of the extension tube 502. The length b of the triboelectric charging path 161 was 200 mm, and the distance c was 500 mm. Further, a collision promoting path 162 having a length d is formed in the connecting portion 505. The length d of the collision promoting path 162 was 100 mm. Polypropylene (PP) resin is used as a material for forming the first triboelectric charging portion for positively charging the particles, and nylon (polyamide) resin is used as a material for forming the second triboelectric charging portion for negatively charging the particles. Acrylonitrile butadiene styrene (ABS) resin was used as the material.

  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).

  The relationship between the size and the 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 shape and arrangement of the protrusions of Embodiment 2-1 were used as the friction charging path, and the shape and arrangement of the protrusions of Embodiment 2-2 were used as the collision acceleration path. As a result, when compared with the total number of exhaust particles of 0.1 μm or more, the vacuum cleaner of the present invention showed a reduction of 43.0% compared to the conventional vacuum cleaner.

  58 to 60 show other examples of the state of vortices generated by the protrusions of the embodiment disclosed above. 58 to 60, the protrusions formed on the wall 132 of the flow path 131 are not shown.

  As shown in FIG. 58, by arranging the adjacent vortices V131 in the flow path 131 so as to contact each other alternately when rotating in the reverse direction and when rotating in the forward direction, the frictional resistance due to the viscosity of the flow can be reduced. The probability of collision between particles can be increased without improvement.

  Further, as shown in FIG. 59, by reducing the size of the vortex V132 generated in the flow channel 131 and increasing the number thereof, the frictional resistance with the wall 132 surface is reduced without reducing the particle collision probability. Is possible.

  Furthermore, as shown in FIG. 60, when all the adjacent vortices V133 rotate in the forward direction in the flow channel 131, the flow at the contact surface between the vortex V132 and the vortex V132 is a streamline in a plane perpendicular to the flow direction. Considering the vector, if one is in the direction from the center of the flow path to the wall 132 surface, the other is in the opposite direction, so that they collide with each other and the collision probability can be increased more effectively. Resistance increases.

  As described above, in the dust aggregation path, the protrusion is formed so that a vortex can be generated in the gas flowing on the downstream side of the protrusion.

  By doing in this way, all the particles collide by the effect | action of a vortex, and a dust lump (cluster) can be formed effectively.

  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 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. FIG. 3 is a diagram illustrating the configuration of first and second friction charging portions of a friction charging path as one embodiment of the present invention. FIG. 5 is a diagram illustrating assembly of first and second frictional charging portions of a frictional charging path as one embodiment of the present invention. FIG. 4 is a cross-sectional view of the triboelectric charging path shown in FIG. 3 as viewed from the direction of the A-A ′ line. It is a figure which shows the model in the other case where a dust lump is formed by this invention. 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 electrification row | line | column showing the ease of charging of a substance. 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 whole vacuum cleaner provided with the dust aggregation path of this invention as Embodiment 1-2 of invention. It is explanatory drawing of a structure of the main body of the vacuum cleaner of this invention. It is a figure which shows the cross section of the connection pipe | tube with which the friction charging path | route is arrange | positioned. It is sectional drawing of the connection part 505 concerning Embodiment 1-2 of this invention. It is the perspective view which saw through the principal part of the friction charging path of Embodiment 2-1. It is a front view which shows the principal part of the friction charging path of Embodiment 2-1. It is a figure which shows the side cross section of the friction charging path of Embodiment 2-1. It is the perspective view which saw through the principal part of the collision promotion path | route of Embodiment 2-2. It is a front view which shows the principal part of the collision acceleration path | route of Embodiment 2-2. It is a figure which shows the side cross section of the collision acceleration path | route of Embodiment 2-2. It is a figure which shows typically other arrangement | sequences of the protrusion concerning Embodiment 2-2. It is a figure which shows typically other arrangement | sequences of the protrusion concerning Embodiment 2-2. It is a figure which shows typically other arrangement | sequences of the protrusion concerning Embodiment 2-2. It is a figure which shows typically other arrangement | sequences of the protrusion concerning Embodiment 2-2. It is a figure which shows typically other arrangement | sequences of the protrusion concerning Embodiment 2-2. It is a figure which shows arrangement | positioning of the adjacent protrusion in the collision acceleration path | route of Embodiment 2-2. It is a perspective view which shows the principal part of the friction charging path and / or collision acceleration path | route of Embodiment 2-3 of this invention. It is a front view which shows the principal part of the friction charging path and / or collision acceleration path | route of Embodiment 2-3 of this invention. It is a sectional side view which shows the friction charging path and / or collision acceleration path | route of Embodiment 2-3 of this invention. It is a figure which shows typically the flow of the gas around the processus | protrusion in the friction charging path and / or collision acceleration path | route of Embodiment 2-3. 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 produced | generated by the protrusion of Embodiment 2-3 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 friction charging path and / or collision acceleration path of Embodiment 2-4 of this invention. It is a front view which shows the principal part of the friction charging path and / or collision acceleration path of Embodiment 2-4. It is a sectional side view which shows the friction charging path and / or collision acceleration path | route of Embodiment 2-4. It is a figure which shows typically the flow of the gas around the processus | protrusion in the friction charging path and / or collision acceleration path | route of Embodiment 2-4. It is a perspective view which shows the principal part of the friction charging path and / or collision acceleration path of Embodiment 2-5 of this invention. It is a front view which shows the principal part of the friction charging path and / or collision acceleration path of Embodiment 2-5. It is a sectional side view which shows the friction charging path and / or collision acceleration path | route of Embodiment 2-5. It is a figure which shows typically the mode of the vortex which generate | occur | produces around the protrusion of the friction charging path and / or collision acceleration path | route of Embodiment 2-5. It is the perspective view which saw through the principal part of the friction charging path and / or collision acceleration path of Embodiment 2-6 of this invention. It is a front view which shows the principal part of the friction charging path and / or collision acceleration path of Embodiment 2-6. It is a figure which shows the protrusion of Embodiment 2-6. (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 Embodiment 2-6. It is the figure which showed typically the mode of the vortex generated by the protrusion of Embodiment 2-6 of the present invention. It is the perspective view which saw through the principal part of the triboelectric charging path by which the protrusion of another shape of Embodiment 2-6 of this invention is arrange | positioned, and / or the collision acceleration path | route. It is a front view which shows the principal part of the friction charge path | route in which the protrusion of another shape of Embodiment 2-6 of this invention is arrange | positioned, and / or a collision acceleration path | route. It is a figure which shows the side cross section of the triboelectric charging path by which the protrusion of another shape of Embodiment 2-6 of this invention is arrange | positioned, and / or a collision acceleration path | route. It is the perspective view which saw through the principal part of the friction charging path and / or collision acceleration path of Embodiment 2-7 of this invention. It is a front view which shows the principal part of the friction charging path and / or collision acceleration path of Embodiment 2-7. It is a figure which shows the side cross section of the friction charging path of Embodiment 2-7 and / or a collision acceleration path | route. It is a figure which shows the shape (A) which looked at the processus | protrusion of Embodiment 2-7 from the top, and the shape (B) seen from the side. It is the perspective view which saw through the principal part of the friction charging path and / or collision acceleration path of Embodiment 2-8. It is a front view which shows the principal part of the friction charging path and / or collision acceleration path of Embodiment 2-8. It is a figure which shows the side cross section of the principal part of the friction charging path and / or the collision acceleration path of Embodiment 2-8. 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 of this invention. It is a figure which shows typically the vortex which arises around a processus | protrusion. It is a figure which shows typically the vortex which arises around a processus | protrusion. It is a figure which shows typically the vortex which arises around a processus | protrusion.

Explanation of symbols

10: first friction charging unit, 12: friction charging path, 20: second friction charging unit, 40, 50, 60, 70, 80, 90, 120: friction charging path and / or collision acceleration path, 100: collision acceleration Path, 110: friction charging path, 41, 51, 61, 71, 81, 91, 101, 111, 121: flow path, 43, 53, 63a, 63b, 63c, 63d, 73a, 73b, 83, 93, 103 , 113, 123: protrusion, 161: friction charging path, 162: collision acceleration path, 502: extension pipe, 503: connecting pipe, 505: connecting portion.

Claims (9)

A flow path through which a gas containing dust flows,
A friction charging path disposed in the flow path to frictionally charge dust;
A collision promoting path for accelerating the formation of a dust mass (cluster) by colliding dust charged in the friction charging path disposed in the flow path;
The friction charging path includes a first friction charging unit that positively charges the contacted or collided dust by a friction charging action, and a second friction charging unit that negatively charges the contacted or collided dust by the friction charging action. Have
The first friction charging unit and the second friction charging unit are arranged to face each other to form one flow path,
The collision accelerating path is formed of a material that is less likely to transfer charges even if dust particles contact or collide with the wall surface compared to the friction charging path, and is provided further downstream of the friction charging path. , Dust aggregation path. The friction charging path includes a first friction charging unit formed of a first material and a second friction charging unit formed of a second material, and the collision promoting path includes a third friction charging unit. The contact potential of the first material is greater than the contact potential of the third material, and the contact potential of the third material is greater than the contact potential of the second material. The dust agglomeration path described in 1. The friction charging path includes a first friction charging portion formed of a material having a large contact potential with respect to the predetermined dust flowing through the flow path, and the predetermined dust flowing through the flow path. A second frictional charging portion formed of a material having a small contact potential, and the collision promoting path is formed of a material having substantially the same contact potential with respect to dust flowing in the flow path. The dust aggregation path according to claim 2 . The friction charging path includes a first friction charging portion formed of a material having a contact potential larger than dust having a maximum contact potential among a plurality of dusts flowing in the flow path; A second frictional charging portion formed of a material having a contact potential smaller than that of dust having a minimum contact potential among a plurality of dusts that circulate, and the collision promoting path passes through the flow path. The dust aggregation path according to claim 3 , wherein the dust aggregation path is formed of a material having substantially the same contact potential with respect to the average contact potential of the circulating dust. The dust aggregation according to any one of claims 1 to 4 , wherein the friction charging path includes a wall that forms the friction charging path, and a protrusion is formed on an inner surface of the wall. Road. The collision-promoting pathway has a wall forming said collision promoting pathway, said on the inner surface of the wall are formed projections, dust coagulation according to any one of claims 1 to 5 Road. The dust aggregation path according to claim 5 or 6 , wherein the protrusion is formed so as to be able to generate a vortex in the gas flowing downstream of the protrusion. An extension tube,
A connecting part;
The dust aggregation path according to any one of claims 1 to 7,
The friction charging path is disposed in the extension tube;
The collision promoting path is a vacuum cleaner disposed in the connecting portion. A connecting pipe having a handle;
A connecting part;
The dust aggregation path according to any one of claims 1 to 7,
The friction charging path is disposed in the connecting pipe;
The collision promoting path is a vacuum cleaner disposed in the connecting portion.

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