JP6350951B2 - Spraying equipment - Google Patents

Description

  The present invention relates to a two-fluid nozzle type spraying device for atomizing a liquid by gas.

  A nozzle for atomizing a liquid is widely used in a space or substance cooling device, a humidifying device, a chemical solution spraying device, a combustion device, or a dust countermeasure device. This atomization nozzle is roughly classified into a one-fluid nozzle that ejects liquid from fine holes and atomizes it, and a two-fluid nozzle that atomizes liquid using gas such as air, nitrogen, or vapor. The The one-fluid nozzle and the two-fluid nozzle are generally characterized in that the two-fluid nozzle is superior in atomization performance to the one-fluid nozzle because the liquid atomizes using the energy of gas. .

  As an example of the two-fluid nozzle for atomizing the liquid, there is a two-fluid nozzle described in Patent Document 1, for example. As shown in FIG. 6, the two-fluid nozzle described in Patent Document 1 has a triple cylinder structure including an inner cylinder 40, an intermediate cylinder 41, and an outer cylinder 42, and the inner cylinder 40 is a proximal-end cylinder. 43 and the tip side cylinder 44 are connected and formed. A hollow portion of the inner cylinder 40 is a central air flow path 45, an intermediate annular flow path between the inner cylinder 40 and the middle cylinder 41 is a liquid flow path 46, and an outer annular flow between the middle cylinder 41 and the outer cylinder 42 is formed. The path is an outer air flow path 47. The proximal end opening 47a of the outer air passage 47 and the proximal end opening 45a of the central air passage 45 are connected to an air supply main pipe (not shown). Therefore, low pressure air is caused to flow into the base end side opening 47a and the base end side opening 45a through an air supply main pipe from an air pressure source including an air compressor (not shown). Further, the base end side opening 46a of the annular liquid channel 46 is connected to a water supply main pipe (not shown), and is pressurized from the liquid tank (not shown) to the base end side opening 46a via the pump and the water supply main pipe. Water is allowed to flow in.

  Tip portions 40b, 41b, 42b having openings 40a, 41a, 42a located on the same line along the axis L on the tip side of the tip tube 44, the middle tube 41, and the outer tube 42 of the inner tube 40. The opening 41a of the middle cylinder 41 is positioned inside the opening 42a of the outer cylinder 42 serving as an injection port, and the opening 40a of the inner cylinder 40 is positioned inside the opening 41a of the middle cylinder 41.

  The distal end side cylinder 44 of the inner cylinder 40 has an inner cylinder opening 40a at the distal end of the cylinder part screwed and connected to the proximal end side cylinder 43, and is provided with an orifice 44a having a reduced diameter at the center in the axial direction. Two concave grooves 44c are formed at substantially opposite positions on the front end surface 44b which is the periphery of the opening 40a of the inner cylinder 40.

  The distal end portion 41b of the middle cylinder 41 has a conical outer peripheral surface, a step 41c is provided therein, a small diameter hollow portion is provided on the distal end side, and the hollow portion has the same diameter as the distal end opening 40a of the inner cylinder 40. Communicate. A tip opening 41a having a smaller diameter is provided at the tip of the small-diameter hollow portion on the tip side.

  The front end surface 44b of the inner cylinder 40 is brought into contact with the step 41c of the middle cylinder 41, and three liquid swirl communication channels 48 are provided between the groove 44c and the step 41c. The liquid swirl communication channel 48 opens to the distal end side hollow portion of the inner cylinder 40, and communicates the distal end side hollow portion of the inner cylinder 40 and the distal end hollow portion of the middle cylinder 41, so A hollow portion at the tip of the cylinder 40 and the middle cylinder 41 is used as a first mixing chamber 49.

  A wide space is provided between the front end portion 41b of the middle cylinder 41 and the front end portion 42b of the outer cylinder 42 is externally fitted. A second mixing chamber 50 is formed between the middle cylinder and the front end closing portions 41b and 42b of the outer cylinder. ing. The second mixing chamber 50 communicates with the annular outer air flow path 47, and an opening 42a serving as an injection port is located at the center of the tip.

  In the nozzle configured as described above, first, the water that has flowed into the liquid flow path 46 is forcibly swirled when passing through the liquid swirl communication flow path 48 and flows into the first mixing chamber 49 as a swirl flow. By this turning, water is primary atomized. The air from the air compressor ejected through the orifice 44a of the central air flow path 45 collides and mixes with the central portion of the water that flows into the first mixing chamber 49 as a swirling flow. While the droplets are secondary atomized by the collision mixing, a gas-liquid mixed fluid of water and air is ejected from the opening 41a of the middle cylinder 41 to the second mixing chamber 50.

  In this second atomized gas-liquid mixed fluid, the air from the air compressor flowing in from the outer air flow path 47 collides and mixes from the outer peripheral side in the second mixing chamber 50. In this way, the gas-liquid mixed mist that is tertiary atomized in the second mixing chamber 50 is ejected from the opening 42 a that is the ejection port of the outer cylinder 42. In particular, since the second mixing chamber 50 is a wide space, the air flowing in from the outer air flow path 47 collides and mixes uniformly with the gas-liquid mixed fluid flowing in from the opening 41a from the outer periphery, and In addition to the fact that the gas-liquid mixed fluid is swirling, the droplets can be uniformly atomized. (See Patent Document 1).

Japanese Patent Laid-Open No. 2001-149822

  However, although the configuration of the conventional two-fluid nozzle described in Patent Document 1 is a complicated nozzle configuration, there is a problem that the particle size of the liquid is large because the sprayed liquid cannot be sufficiently atomized. . Specifically, the particle size of the liquid sprayed by the two-fluid nozzle described in Patent Document 1 is 50 μm or more. When the particle size of the sprayed liquid is large in this way, it takes time until the sprayed liquid vaporizes, that is, there is a problem that wetting or the like occurs due to slow vaporization.

  An object of the present invention is to solve the conventional problems described above, and an object thereof is to provide a spraying device capable of spraying a liquid having a small particle diameter that is quick to vaporize and does not feel wet. More specifically, the present invention provides a two-fluid nozzle type spray device capable of spraying a liquid having a particle size of 10 μm or less as an example of a small particle size that is fast vaporized and does not feel wet. For the purpose.

To achieve the object, according to one aspect of the present invention,
A spraying device body having a liquid flow path and a gas flow path;
An inner lid portion disposed at the tip of the spraying device main body, covering the opening of the liquid channel and having a flat inner end surface;
An outer lid portion that is disposed at the tip of the spraying device main body portion to cover the inner lid portion, covers an opening of the gas flow path, and has a flat outer end surface facing the inner end surface of the inner lid portion;
An annular part that is disposed between the inner lid part and the outer lid part and that constitutes a gas-liquid mixing part that is a disk-shaped outer space;
A rectifying plate disposed between the gas-liquid mixing part and the outer lid part and having a through hole communicating with the gas-liquid mixing part;
A liquid inlet that penetrates at least one place in the circumferential direction of the inner lid portion, communicates with the gas-liquid mixing portion, and allows a liquid flow flowing through the liquid flow channel to flow into the gas-liquid mixing portion;
The liquid that is disposed in a side portion of the gas-liquid mixing portion between the inner lid portion and the outer lid portion so as to communicate with the gas-liquid mixing portion and flows into the gas-liquid mixing portion from the liquid inlet A gas inlet for flowing a gas flow flowing through the gas flow path into the gas-liquid mixing unit,
It is provided through the outer end surface of the outer lid portion and communicates with the gas-liquid mixing portion and the through hole of the rectifying plate, and the gas flow and the liquid flow are mixed in the gas-liquid mixing portion. There is provided a spraying device including a jetting part for jetting atomized liquid.

  As described above, according to the spray device according to the aspect of the present invention, it is possible to provide a spray device capable of spraying a liquid having a small particle diameter that is quick to vaporize and does not feel wet. More specifically, it is possible to provide a two-fluid nozzle type spraying apparatus that can spray a liquid having a particle size of 10 μm or less as an example of a small particle size that is quick to vaporize and does not feel wet.

Cutting unit end view of the spray device 10 in the first embodiment of the present invention Sectional drawing in the 1B-1B line | wire of FIG. 1A of the spraying apparatus 10 in 1st Embodiment of this invention. Sectional drawing in the 1C-1C line | wire of FIG. 1A of the spraying apparatus 10 in 1st Embodiment of this invention. Cutting section end view of spraying apparatus 10B in the second embodiment of the present invention The figure which shows the baffle plate of the hole of the serrated edge in 3rd Embodiment of this invention. The figure which shows the baffle plate of the through-hole of the serrated edge with 12 teeth in 3rd Embodiment of this invention. The figure which shows the relationship between the diameter of the tubular flow path in 3rd Embodiment of this invention, the number of teeth of the hole of the serrated edge of a baffle plate, a magnitude | size, and a noise value. Sectional drawing which shows schematic structure of the conventional spray apparatus The figure which shows the baffle plate of the through-hole of the serrated edge in 4th Embodiment of this invention. The side view which shows the baffle plate of the through-hole of the serrated edge in 4th Embodiment of this invention The perspective view which expanded the vicinity of the through-hole part of the baffle plate of the through-hole of the serrated edge in 4th Embodiment of this invention Explanatory drawing for demonstrating the dihedral angle of the tooth | gear of the baffle plate in 4th Embodiment of this invention. Cutting unit end view of spraying device 10C in the fourth embodiment of the present invention The figure which shows the relationship between the dihedral angle and noise level in 4th Embodiment of this invention. The figure which shows the relationship between the number of teeth which made the dihedral angle 150 degrees in 4th Embodiment of this invention, and a noise value The figure which shows the baffle plate which the number of teeth of 3 which makes the dihedral angle 150 degree | times is continuous. The figure which shows the baffle which the number of teeth 3 which made the dihedral angle 150 degree | times is not continuous.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  Embodiments of the present invention relate to a spray device that atomizes and sprays a liquid using a gas. Examples of the gas include air, nitrogen, oxygen, or an inert gas. It can be selected appropriately according to the purpose. Examples of the liquid include water, ozone water, a chemical solution having a sterilizing and disinfecting function, a paint, fuel oil, and the like, and can be appropriately selected depending on the purpose of use.

(First embodiment)
FIG. 1A is a cut end view showing a spray device 10 according to a first embodiment of the present invention. Hereinafter, the configuration of the spray device 10 will be described with reference to FIG. 1A.

  The spraying device 10 includes at least a spraying device main body portion 10a, an inner lid portion 13, and an outer lid portion 14. The gas-liquid mixing part 15 is comprised by the inner cover part 13, the annular part 24, the baffle plate 30, and the outer cover part 14. FIG. The spray device 10 further includes a spray device lid fixing portion 17.

  The spraying device main body 10a includes a first liquid channel 11 disposed along the axial direction at the center of the columnar member, and a cylinder disposed along the axial direction with a space around the first liquid channel 11. Each of the gas flow paths 12 is formed. The first liquid channel 11 and the gas channel 12 are separated by a cylindrical portion 10b located in the center as a part of the spray device main body 10a. The first liquid channel 11 shows only the front end portion, and a liquid supply port (not shown) at the rear end portion is connected to a pump connected to the liquid tank via, for example, a liquid supply pipe. The gas flow path 12 also shows only the front end side, and a gas supply port (not shown) at the rear end is connected to, for example, an air pressure source including an air compressor via a gas supply pipe.

  The distal end of the cylindrical portion 10b slightly protrudes toward the distal end side from the spraying device main body portion 10a other than the cylindrical portion 10b, and the inner lid portion 13 is fixed to the distal end.

  The inner lid portion 13 is disposed at the tip of the spraying device main body portion 10a, covers the opening of the first liquid channel 11, and has a substantially C-shaped axial cross section having a flat inner end surface 13a. In the inner lid part 13, a second liquid channel 22 having a disk-like outer shape is formed between the end face of the cylindrical part 10 b and the inner face of the inner end face 13 a of the inner lid part 13. A liquid inflow port 18 penetrating the inner end surface 13a in the axial direction is formed at one place in the outer peripheral direction of the inner end surface 13a of the inner lid portion 13. That is, the liquid inflow port 18 is provided so as to penetrate at least one place in the circumferential direction of the inner lid portion 13. For example, the inner lid portion is an upstream flat surface near the outer peripheral wall surface of the gas-liquid mixing portion 15. 13, the first liquid channel 11 and the gas-liquid mixing unit 15 are connected to each other, and the liquid flow flowing through the first liquid channel 11 is caused to flow into the gas-liquid mixing unit 15. .

  The outer lid portion 14 is disposed at the tip of the spraying device main body portion 10 a, covers the inner lid portion 13, covers the opening of the gas flow path 12, and is a flat outer end surface 14 a facing the inner end surface 13 a of the inner lid portion 13. The cross section in the axial direction has a substantially Ω shape. The outer lid portion 14 covers a side portion between the outer lid portion 13 and the cylindrical outer space 23 with a predetermined interval.

  A thin disc-shaped rectifying plate 30 having a through hole 31 having the same inner diameter as that of a tubular flow path 16b to be described later is fitted and fixed to the inner surface of the outer lid portion 14 on the distal end side.

  Between the inner lid portion 13 and the outer lid portion 14 and further inside the current plate 30, a C-shaped flat ring portion 24 having a hole portion 24 a having an inner diameter larger than the through hole 31 is provided on the inner lid portion. 13 is fixedly disposed between the outer peripheral portion of the inner end face 13 a and the rectifying plate 30. The annular part 24 constitutes the gas-liquid mixing part 15 which is a disk-shaped outer space with the current plate 30. A gas inlet 19 is formed by providing a notch or a gap at one location in the annular portion 24. FIG. 1B shows a cross-sectional view of the spraying device 10 taken along line 1B-1B in FIG. 1A. As shown in FIG. 1B, the gas inlet 19 is located at the center (central axis 27) of the spraying device main body 10a. On the other hand, the liquid inlet 18 is 180 degrees out of phase with the liquid inlet 18 facing the liquid inlet 18. Therefore, the outer lid portion 14 is sandwiched and fixed between the end face of the spray device main body portion 10a and the spray device lid fixing portion 17 so as to cover the inner lid portion 13, the annular portion 24, and the current plate 30. ing. Note that the spray device lid fixing portion 17 may be omitted, and the outer lid portion 14 may be directly fixed to the end surface of the spray device main body 10a.

  Thus, in order to reliably form the gas-liquid mixing portion 15 having a disk-like outer shape with a predetermined interval between the outer lid portion 14 and the inner lid portion 13, the annular portion 24 and the rectifying plate 30 are provided. The gas-liquid mixing portion 15 can be forcibly disposed and formed as a gap in the hole portion 24a of the annular portion 24 and between the inner surface of the rectifying plate 30 and the inner end surface 13a of the inner lid portion 13. In addition, FIG. 1C has shown sectional drawing in the 1C-1C line | wire of FIG. 1A of the spray apparatus 10, and as shown to FIG. 1C, the through-hole 31 of the baffle plate 30 has a circular edge. . The gas-liquid mixing unit 15 configured in this way is for mixing the gas flow flowing through the gas flow path 12 and the liquid flow flowing through the first liquid flow path 11.

  The gas inlet 19 is disposed in communication with the gas-liquid mixing unit 15 on the side of the gas-liquid mixing unit 15 between the inner lid part 13 and the outer lid part 14. The gas flow flowing through the gas flow path 12 is caused to flow into the gas-liquid mixing unit 15 toward the liquid flow flowing into the gas flow 15. For example, the gas inlet 19 is located at a position facing the liquid inlet 18 that is 180 degrees out of phase with the liquid inlet 18 with respect to the center (center axis 27) of the spray apparatus body 10 a. Further, a cylindrical portion protrudes and is fixed to the center of the outer surface of the outer end surface 14a of the outer lid portion 14, and the jet port 16a, the tubular flow channel 16b, and the gas-liquid mixed fluid that pass through the outer end surface 14a and the cylindrical portion in the axial direction. The ejection part 16 which has the inflow port 16c is formed. In other words, the ejection part 16 is provided through the outer end surface 14 a of the outer lid part 14, communicates with the gas-liquid mixing part 15 and the through hole 31 of the rectifying plate 30, and the gas-liquid mixing part 15 The liquid atomized by mixing with the liquid flow is rectified by the through hole 31 of the rectifying plate 30 and then ejected from the ejection part 16. The jet hole 16 a, the tubular channel 16 b, the gas-liquid mixed fluid inlet 16 c, and the through-hole 31 at the circular edge of the rectifying plate 30 are arranged on the same central axis 27 as the first liquid channel 11. On the other hand, the liquid inlet 18 is located at a position deviating from the central axis 27.

  Therefore, the gas-liquid mixing unit 15 is formed by being surrounded by the annular part 24, the inner lid part 13, and the rectifying plate 30, and includes a liquid inlet 18 penetrating the inner lid part 13 along the axial direction, and a shaft The gas inlet 19 in which the annular portion 24 is cut out along the direction intersecting the direction (for example, the radial direction), the through-hole 31 in the circular edge of the rectifying plate 30, and the outer lid portion 14 along the axial direction. It communicates with the penetrating jet port 16a.

  In such a configuration, the liquid supplied to the spray device 10 flows from the liquid supply port (not shown) to the front end side of the device through the first liquid flow path 11 to form a liquid flow with respect to the spray device main body 10a. The flow is supplied to the gas-liquid mixing unit 15 through the second liquid flow path 22 and the liquid inlet 18. In addition, the gas supplied to the spraying device 10 flows into the gas flow path 12 from the gas supply port (not shown) to the front end side of the device with respect to the spraying device main body 10a to become a gas flow. The gas is supplied to the gas-liquid mixing unit 15 through the gas inlet 19.

  When a gas flow and a liquid flow are supplied to the gas-liquid mixing unit 15, the gas-liquid mixing unit 15 mixes them with each other to atomize the liquid, and then the through-hole 31 at the circular edge of the rectifying plate 30. Rectified through the gas-liquid mixed fluid inlet 16c and the tubular flow passage 16b of the jet part 16 provided in the outer lid part 14, and the mixed and atomized liquid is jetted from the jet outlet 16a to the outside. To do.

  Hereinafter, the atomization mechanism in the gas-liquid mixing unit 15 will be described with reference to FIG. 1B. The liquid flow that has flowed through the first liquid flow path 11 passes through the second liquid flow path 22, passes through the liquid inlet 18 provided in the inner lid portion 13, and as shown in FIG. From the vicinity of the inner surface of the hole 24 a of the annular portion 24, a liquid flow is supplied in the direction of the ejection portion 16.

  On the other hand, with respect to the liquid flow supplied from the liquid inlet 18 to the gas-liquid mixing unit 15, the gas supplied to the gas-liquid mixing unit 15 through the gas inlet 19 positioned at a position opposite to the liquid inlet 18. The flow collides with the liquid in the gas-liquid mixing unit 15. By colliding in this way, the liquid is spread to the inner side surface (inner peripheral surface) of the hole 24a of the annular portion 24 and becomes a thin film. Furthermore, by flowing in the circumferential direction along the inner peripheral surface of the hole portion 24a of the annular portion 24 from this state, the thin film shape is changed to a finer droplet. Furthermore, the gas-liquid mixed fluid containing the liquid droplets is stirred in the gas-liquid mixing unit 15, whereby the liquid droplets can be further atomized, and a liquid having a smaller particle diameter is sprayed from the jet nozzle 16a. It is possible.

  Specifically, the gas-liquid mixing part 15 has an inner diameter of 6.0 mm and a height of 2.0 mm, the thickness of the rectifying plate 30 is 0.5 mm, and the through-hole 31 at the circular edge of the rectifying plate 30 has a diameter. The diameter of the jet port 16a and the gas-liquid mixed fluid inlet port 16c of the jet part 16 is 1.0 mm, the tubular flow path 16b is 1.0 mm in diameter and 3.0 mm in length, and is liquid. The inlet 18 has a diameter of 0.7 mm, the gas inlet 19 has a rectangular shape, and is a spray device 10 having a width of 1.0 mm and a height of 1.0 mm.

  As an example of gas, compressed air was supplied at a pressure of 0.3 MPa (gauge pressure), and water was supplied as an example of liquid at a pressure of 0.26 MPa (gauge pressure). The Sauter average particle size of water atomized under these conditions was evaluated by a laser diffraction method. The measurement distance of the laser diffraction method was 300 mm from the tip of the spraying apparatus 10, and the Sauter average particle diameter was 10.0 μm. The noise value under these conditions was 80 dB when measured with a noise meter at a position 1000 mm from the tip of the spraying device 10.

  According to the spray device 10 according to the first embodiment, the annular portion 24 and the current plate 30 are provided between the inner lid portion 13 and the outer lid portion 14, and the outer lid portion 14, the inner lid portion 13, The gas-liquid mixing part 15 having a disk-like outer shape with a predetermined interval between them is formed with certainty. For this reason, in the gas-liquid mixing part 15, the liquid flowing in from the liquid inlet 18 and the gas flowing in from the gas inlet 19 intersect and collide with each other and spread on the inner peripheral surface of the hole 24 a of the annular part 24. After that, the liquid is atomized by circulation and stirring along the inner peripheral surface, and the atomized liquid can be ejected from the ejection part 16 while being rectified by the through hole 31 of the rectifying plate 30. As a result, it is possible to provide the spraying device 10 capable of spraying a liquid having a small particle diameter that does not feel wet or the like quickly. More specifically, a two-fluid nozzle type spraying device 10 capable of spraying a liquid having a particle size of 10 μm or less can be provided as an example of a small particle size that is fast vaporized and does not feel wet. .

  In the first embodiment, the gas inlet 19 is disposed at a position facing the liquid inlet 18 with respect to the central axis 27 of the spray device main body 10a. However, it is not limited to such an arrangement. For example, the gas inlet 19 is disposed in the vicinity of the liquid inlet 18 and the gas flowing in from the gas inlet 19 with respect to the inflow direction of the liquid flow flowing in from the liquid inlet 18. The flow inflow directions may be crossed, and a plurality of the gas inlets 19 and the liquid inlets 18 may be arranged.

  In addition, a disc-shaped protrusion having a thickness smaller than the height of the gas-liquid mixing unit 15 may be provided on the upstream plane that is the inner end surface 13 a of the inner lid 13.

(Second Embodiment)
FIG. 2 is a cut end view showing a spray device 10B having a gas-liquid mixed fluid inlet 16c having a truncated cone shape as a second embodiment. As shown in FIG. 2, the gas-liquid mixed fluid inlet 16c is formed of a conical surface 16e that is inclined from the opening 16d having a diameter larger than that of the through hole 31 so that the diameter becomes narrower toward the jet outlet 16a. It is trapezoidal. The purpose of the gas-liquid mixed fluid inlet port 16c having a truncated cone shape is to further atomize the liquid. When a gas flow and a liquid flow are supplied to the gas-liquid mixing unit 15, the gas-liquid mixing unit 15 mixes them with each other to atomize the liquid, and then the through-hole 31 at the circular edge of the rectifying plate 30. Rectified through the gas-liquid mixed fluid inlet 16c and the tubular flow channel 16b of the jet portion 16 provided in the outer lid portion 14, and the mixed and atomized liquid is discharged to the outside from the jet port 16a. Erupts. When the gas-liquid mixed fluid inlet 16c has a truncated cone shape, the gas-liquid mixed fluid traveling from the through hole 31 at the circular edge of the rectifying plate 30 to the jet outlet 16a passes through the through hole 31 of the rectifying plate 30. After the rectification, the flow velocity is reduced by once spreading at the opening 16d having a diameter larger than the diameter of the through hole 31. Thereafter, by gradually contracting along the conical surface 16e, the atomized droplets can be made less likely to aggregate before reaching the spout 16a, and the droplets of the gas-liquid mixed fluid are atomized. It is possible to spray from the jet nozzle 16a while maintaining the state. The diameter of the maximum diameter on the inlet side of the frustoconical gas-liquid mixed fluid inlet 16c is equal to or smaller than the diameter of the inner periphery of the hole 24a of the annular portion 24 and is equal to or larger than twice the diameter of the tubular flow channel 16b. Is preferred. More preferably, the diameter of the maximum diameter on the inlet side is preferably 2 to 4 times.

  As a specific example, the maximum diameter on the inlet side of the frustoconical gas-liquid mixed fluid inlet 16c is 3.0 mm in diameter, and the tubular channel 16b is 1.0 mm in diameter and 2.0 mm in length.

  When measurement was performed on this spraying device 10B under the same conditions as described above, the Sauter average particle size was 9.0 μm and the noise value was 80 dB.

(Third embodiment)
FIG. 3 is a diagram showing a rectifying plate 30C of a through hole 31C having a sawtooth shape as a third embodiment. The purpose of making the edge of the through hole 31C of the rectifying plate 30C serrated is to reduce the noise generated when the gas-liquid mixed fluid that atomizes the liquid is ejected from the spraying devices 10 and 10B according to the previous embodiment. It is in. The noise generated when the gas-liquid mixed fluid is ejected is generated between the gas-liquid mixed fluid jet and the outside air by the friction between the high-speed gas-liquid mixed fluid jet ejected from the spray devices 10 and 10B and the outside air. This is caused by the formation of turbulent flow. A region where the jet velocity is uniform is generated in the vicinity of the jet port from which the gas-liquid mixed fluid obtained by atomizing the liquid is jetted. By providing the through-hole 31C with the serrated edge of the rectifying plate 30C, the region where the jet velocity in the vicinity of the jet port is uniform changes, and the turbulent flow formed between the gas-liquid mixed fluid jet and the outside air is reduced. can do. As a result, noise can be reduced.

  Specifically, the thickness of the rectifying plate 30C is 0.5 mm, the through-hole 31C of the serrated edge of the rectifying plate 30C has 6 teeth, the tip circle diameter is 1.0 mm, and the root circle diameter is 1 0.7 mm.

  When the spray device 10 having such a configuration was measured under the same conditions as described above, the Sauter average particle size was 10.0 μm and the noise value was 75 dB.

  When the measurement was performed under the same conditions as described above using the rectifying plate 30C having a saw-toothed edge hole shown in FIG. 3 in the spraying apparatus 10B shown in FIG. 2, the Sauter average particle diameter was 9.0 μm, The noise value was 75 dB.

  FIG. 5 shows the relationship between the diameter of the tubular channel 16b, the number of teeth of the through hole 31C in the serrated edge of the rectifying plate 30C, the size, and the noise value.

  Specifically, in the spray device 10B shown in FIG. 2, when the diameter of the tubular flow channel 16b is 1.0 mm and 1.5 mm, and the through-hole 31C at the serrated edge of the rectifying plate 30C having a thickness of 0.5 mm, When the number of teeth was 6 and 12, the noise value was measured by changing the diameter of the tip circle 32 and the diameter of the root circle 33.

  FIG. 4 shows a rectifying plate 30C of a through-hole 31C having a sawtooth shape when the number of teeth is twelve.

  When the diameter of the addendum circle 32 is close to the diameter of the tubular channel 16b, the noise value decreases, the addendum circle 32 increases in diameter and the noise value increases, and the addendum circle 32 has a disk-like diameter. When the diameter of the gas-liquid mixing part 15 having an outer diameter of ½ was exceeded, the noise value became a substantially constant value. If the diameter of the tip circle 32 is smaller than the tubular flow path 16b, it becomes a resistance to the flow of the gas-liquid mixed fluid, the flow rate of the gas-liquid mixed fluid decreases, and the Sauter average particle size increases, which is not preferable. The relationship between the diameter of the tip circle 32 and the noise value showed the same change between the case of 6 teeth and the case of 12 teeth.

  In addition, when the diameter of the tubular flow channel 16b is 1.5 mm, the noise value is reduced when the diameter of the tip circle 32 is close to the diameter of the tubular flow channel 16b, as in the case of 1.0 mm. As the diameter of the tip circle 32 increased, the noise value also increased.

  Therefore, if the diameter of the tip circle 32 is equal to or larger than the diameter of the tubular flow channel 16b and the diameter of the root circle 33 is equal to or smaller than ½ of the diameter of the gas-liquid mixing portion 15 having a disk-shaped outer shape, the noise level is reduced. Can be reduced.

  Further, if the diameter of the tip circle 32 is equal to or larger than the diameter of the tubular flow channel and the diameter of the root circle 33 is equal to or smaller than 1/3 of the diameter of the gas-liquid mixing portion 15 having a disk-like outer shape, the noise value is further increased. Can be reduced.

  As described above, according to the spraying apparatus according to the first to third embodiments of the present invention, the liquid inlet 18 is formed by the gas-liquid mixing unit 15 provided between the inner lid 13 and the rectifying plates 30 and 30C. The liquid flowing in from the gas and the gas flowing in from the gas inlet 19 collide, and the liquid is pushed out in a thin film shape on the inner side surface (inner peripheral surface) of the hole 24a of the annular portion 24 and along the inner peripheral surface. It flows in the circumferential direction and becomes fine droplets. Furthermore, the gas-liquid mixed fluid containing droplets is stirred in the gas-liquid mixing unit 15, whereby the liquid is atomized, and the atomized liquid can be ejected from the ejection unit 16.

  Further, according to the spray device 10B according to the second embodiment of the present invention, the gas-liquid mixed fluid inlet 16c is formed in a truncated cone shape, so that the atomized droplets aggregate before reaching the jet outlet 16a. It is possible to make the liquid more atomized, and it is possible to eject more atomized liquid from the ejection part 16.

  Further, by passing the gas-liquid mixed fluid in which the liquid is atomized through the through-hole 31C at the serrated edge of the rectifying plate 30C, the turbulent flow formed between the gas-liquid mixed fluid jet and the outside air is reduced, and the fine particles The liquefied liquid can be ejected from the ejection part 16 with low noise.

  As a result, it is possible to provide a spraying device capable of spraying a liquid having a small particle size that is fast vaporized and does not feel wet. More specifically, the present invention provides a two-fluid nozzle type spraying device capable of spraying a liquid having a particle size of 10 μm or less with low noise as an example of a small particle size that is fast vaporized and does not feel wet. Can do.

(Fourth embodiment)
As a fourth embodiment, a rectifying plate 30D having a configuration different from that of the rectifying plate 30 of the previous embodiment is provided, and the triangular teeth 34 of the through-hole 31D having a saw-tooth shape are mixed with the gas-liquid mixture of the rectifying plate 30D. It is inclined with respect to the part-side surface 30Da.

  FIG. 7A is a diagram illustrating a rectifying plate 30D of the fourth embodiment. FIG. 7B is a side view of the current plate 30D. FIG. 7C is an enlarged perspective view of a portion of the through hole 31D of the serrated edge of the rectifying plate 30D. FIG. 7D is an explanatory diagram showing the dihedral angle 36 when one tooth 34 is viewed from the through hole side in order to explain the dihedral angle 36 of the teeth 34 of the current plate 30D.

  In the current plate 30D, the surface 34a of the tooth 34 formed by the tooth tip and the tooth bottom of the through hole 31D having a serrated edge, the tooth base circle 33 and the outer circumference circle 35 of the current plate 30D. Is defined as a dihedral angle 36 (refer to FIGS. 7C and 7D). That is, the dihedral angle 36 is an angle formed by the adjacent two surfaces 34a and 30Da. Here, as an example, the dihedral angle 36 is at least 180 degrees or less.

  The purpose of inclining the teeth 34 of the current plate 30D is to further reduce the noise generated when the gas-liquid mixed fluid obtained by atomizing the liquid is ejected from the spray device according to the previous embodiment. By inclining the teeth 34, when the gas-liquid mixed fluid contracts from the gas-liquid mixing portion 15 toward the jet port 16a, the flow can be applied close to the surface 34a of the teeth 34, The turbulent flow formed between the gas-liquid mixed fluid jet and the outside air can be further reduced. As a result, noise can be further reduced.

  Specifically, the thickness of the rectifying plate 30D is 0.5 mm, the through hole 31D of the serrated edge of the rectifying plate 30D has 6 teeth, the tip circle diameter is 1.6 mm, and the root circle diameter is 2 .6 mm and the dihedral angle 36 is 150 degrees.

  When the spray apparatus 10 having such a configuration was measured under the same conditions as described above, the Sauter average particle diameter was 10.0 μm and the noise value was 72 dB.

  FIG. 8 shows a spraying device 10C using the current plate 30D of the through-hole 31D having a sawtooth shape shown in FIG. 7A as the spraying device 10B shown in FIG. When measurement was performed under the same conditions as described above, the Sauter average particle diameter was 9.0 μm, and the noise value was 72 dB.

  The relationship between the dihedral angle 36 and the noise level is shown in FIG. The noise value decreases as the dihedral angle 36 decreases from 180 degrees, shows a minimum value from 150 degrees to 120 degrees, increases as the noise value decreases from 120 degrees to 90 degrees, and increases from 90 degrees to 180 degrees. The noise level was the same as in the case of. Further, at less than 90 degrees, the noise value increased compared to 180 degrees. If the dihedral angle 36 is 90 degrees or more and 180 degrees or less, the noise value becomes small, which is preferable. Furthermore, if the dihedral angle 36 is 120 degrees or less and 150 degrees or more, the noise value is minimized, which is more preferable.

  FIG. 9 shows the relationship between the number of teeth with the dihedral angle 36 being 150 degrees and the noise value. As the number of teeth with a dihedral angle 36 of 150 degrees increased, the noise value decreased. In addition, when the number of teeth with a dihedral angle 36 of 150 degrees is set to two or three, the magnitude of the noise value depends on whether the teeth with a dihedral angle 36 of 150 degrees are continuous or not. There was no difference. FIG. 11A shows a current plate 30D in which three teeth having a dihedral angle 36 of 150 degrees are continuously arranged. Further, FIG. 11B shows a rectifying plate 30D in which the number of teeth having a dihedral angle 36 of 150 degrees and every other number of teeth is not continuous but arranged every other one. By setting the dihedral angle 36 of at least one tooth 34 to 150 degrees, there was an effect of noise reduction.

  In the fourth embodiment, six teeth 34 are illustrated as an example, but the number of teeth 34 is not limited thereto.

  According to the fourth embodiment, the teeth 34 are inclined so that the dihedral angle 36 of the teeth 34 of the rectifying plate 30D is 90 degrees or more and 180 degrees or less. Noise generated when the liquid mixture is ejected can be further reduced.

  In addition, it can be made to show the effect which each has by combining arbitrary embodiment or modification of the said various embodiment or modification suitably. In addition, combinations of the embodiments, combinations of the examples, or combinations of the embodiments and examples are possible, and combinations of features in different embodiments or examples are also possible.

  The spraying apparatus according to the above aspect of the present invention is a spraying apparatus capable of spraying a liquid having a liquid particle size of about 10 μm or less, and this spraying apparatus is used for cooling, humidifying, chemical spraying, and combustion of space or substances. Or it can be widely used for dust countermeasures.

DESCRIPTION OF SYMBOLS 10, 10B, 10C Spray apparatus 10a Spray apparatus main-body part 11 1st liquid flow path 12 Gas flow path 13 Inner cover part 13a Inner end surface 14 Outer cover part 14a Outer end surface 15 Gas-liquid mixing part 16 Ejection part 16a Ejection port 16b Tubular flow Channel 16c Gas-liquid mixed fluid inlet 16d Opening 16e Conical surface 17 Spraying device lid fixing portion 18 Liquid inlet 19 Gas inlet 22 Second liquid flow passage 23 Gap 24 Ring portion 24a Hole 27 Central shafts 30, 30C, 30D Current plate 30Da Gas-liquid mixing part side surfaces 31, 31C, 31D formed by the root circle and outer circumference of the current plate Through-hole 32 Tooth circle 33 Tooth circle 34 Tooth 34a Tooth gas-liquid mixing part side Surface 35 Perimeter circle 36 Dihedral angle

Claims (6)

A spraying device body having a liquid flow path and a gas flow path;
An inner lid portion disposed at the tip of the spraying device main body, covering the opening of the liquid channel and having a flat inner end surface;
An outer lid portion that is disposed at the tip of the spraying device main body portion to cover the inner lid portion, covers an opening of the gas flow path, and has a flat outer end surface facing the inner end surface of the inner lid portion;
An annular part that is disposed between the inner lid part and the outer lid part and that constitutes a gas-liquid mixing part that is a disk-shaped outer space;
A rectifying plate disposed between the gas-liquid mixing part and the outer lid part and having a through hole communicating with the gas-liquid mixing part;
A liquid inlet that penetrates at least one place in the circumferential direction of the inner lid portion, communicates with the gas-liquid mixing portion, and allows a liquid flow flowing through the liquid flow channel to flow into the gas-liquid mixing portion;
The liquid that is disposed in a side portion of the gas-liquid mixing portion between the inner lid portion and the outer lid portion so as to communicate with the gas-liquid mixing portion and flows into the gas-liquid mixing portion from the liquid inlet A gas inlet for flowing a gas flow flowing through the gas flow path into the gas-liquid mixing unit,
It is provided through the outer end surface of the outer lid portion and communicates with the gas-liquid mixing portion and the through hole of the rectifying plate, and the gas flow and the liquid flow are mixed in the gas-liquid mixing portion. A spraying device comprising: an ejection part for ejecting atomized liquid.   2. The spray device according to claim 1, wherein the ejection portion includes a frustoconical gas-liquid mixed fluid inflow port that communicates with the outer end surface of the outer lid portion.   The spraying device according to claim 1 or 2, wherein an edge of the through hole of the current plate is serrated.   The diameter of the tip circle of the through hole in the serrated edge of the rectifying plate is equal to or larger than the diameter of the tubular flow channel in the ejection part, and the diameter of the root circle is the space of the disk-shaped outer shape. The spraying device according to claim 3, wherein the spraying device has a diameter equal to or less than ½ of a diameter of the gas-liquid mixing part.   A surface of at least one tooth on the gas-liquid mixing portion side formed by a tooth tip and a tooth bottom of the serrated edge of the current plate, and a tooth bottom circle and an outer circumference circle of the current plate The spray device according to claim 3, wherein a dihedral angle formed with a surface on the gas-liquid mixing portion side to be formed is 90 degrees or more and 180 degrees or less.   The spraying device according to claim 5, wherein the dihedral angle is 120 degrees or more and 150 degrees or less.

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