JP2018196848A - Spray device - Google Patents

Abstract

To provide a spray device that can reduce a noise value at spraying while maintaining spray properties such as a particle diameter and the like.SOLUTION: A plurality of conical shaped recesses 20 are provided at an outside cap part front face 14b of an outside cap part 14 that is one of the parts constituting a spray device 10, thereby generating a number of small disturbances at an outside surface of an outside end part 14a, reducing emitting noise and reducing a noise value.SELECTED DRAWING: Figure 2C

Description

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

A nozzle for atomizing a liquid is widely used in a space or substance cooling device, a humidifying device, a liquid medicine spraying device, a combustion device, a dust countermeasure device, or the like. This atomization nozzle is roughly classified into one-fluid nozzle that ejects liquid from finer holes and atomizes, and two-fluid nozzle that atomizes liquid using gas such as air, nitrogen, or vapor. Is done. 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 includes a nozzle body 210, a water orifice part 220, an air orifice part 230, and a cap part 240. In the nozzle body 210, a liquid channel 212 is formed along the central axis from the rear end side (left end side in FIG. 6) of the nozzle body portion 210 to the tip ejection side (right end side in FIG. 6). A liquid channel inlet 211 is provided at the rear end of the nozzle main body 210 of the liquid channel 212. The liquid flow path inlet 211 is connected to, for example, a pump connected to the liquid tank via a water supply pipe. Further, the nozzle main body 210 is formed with a gas flow path 214 in parallel with the liquid flow path 212. The nozzle main body 210 is compressed by, for example, air compression via a gas flow path inlet 213 provided on the side surface. It is connected to an air pressure source consisting of a machine.

  On the inner peripheral surface of the cylindrical part of the cap part 240 and the outer peripheral surface of the tip part of the nozzle body part 210, a screwing part for screwing the nozzle body part 210 and the cap part 240 is formed. A water orifice part 220 is connected to the tip of the nozzle body 210 and an air orifice part 230 is disposed so as to cover the water orifice part 220. In this state, the cap part 240 is screwed into the tip of the nozzle main body 210 and fitted, and the nozzle main body 210, the water orifice part 220, the air orifice part 230, and the cap part 240 are fixed integrally. . In the center of the water orifice part 220, a circular opening 221 that communicates with the liquid flow path 212 and ejects liquid is provided. For example, the liquid pressurized by a liquid feed pump or the like is ejected from the opening 221 of the water orifice part 220 connected to the nozzle main body 210.

  As shown in FIG. 6, the air orifice part 230 is provided with a mist outlet 231 penetrating in the axial direction. On the surface 230b of the air orifice part 230 that comes into contact with the water orifice part 220, concave grooves are formed radially at equal intervals from the center of the air orifice part 230. The water orifice part 220 and the air orifice part 230 come into contact with each other and are fixed, whereby the concave groove is sealed and the air orifice channel 232 is formed. Since the gas annular channel 233 and the air orifice channel 232 formed between the cylindrical part 220a of the water orifice part 220 and the cylindrical part 230a of the air orifice part 230 communicate with each other, from the gas channel inlet 213 The pressurized air that has flowed in can flow into all of the air orifice channels 232 with the same air pressure via the gas channel 214 and the gas annular channel 233.

  With such a configuration, the air ejected from all the air orifice channels 232 of the air orifice part 230 collides with each other on the central axis of the air orifice part 230. Since the air orifice channel 232 is formed on a plane on the ejection side of the water orifice part 220, air collides on a plane substantially parallel to this plane. On the other hand, the liquid is ejected from the opening 221 of the water orifice part 220 along a direction substantially perpendicular to the plane on the ejection side of the water orifice part 220. Therefore, the liquid is caused to collide with the collision portion where the pressurized air ejected from the air orifice channel 232 collides from a substantially vertical direction. Then, the liquid is mixed with the pressurized air at the collision portion to become a fine mist. The fine mist generated in this way is sprayed from the mist outlet 231 of the air orifice part 230.

JP 2017-381 A

However, in the configuration of the conventional two-fluid nozzle described in Patent Document 1, there is a problem that noise is generated due to a collision between air and water necessary for atomization and a mist jet generated during spraying. The noise of the conventional two-fluid nozzle is large enough to be used in front of the station or on the street, but if it can be reduced, it can be used as a countermeasure against heat in a quiet environment such as indoors. spread. When the conventional two-fluid nozzle is used in the above-described application, it is necessary to take measures to reduce noise such as shielding noise or moving the nozzle spray position away from the user. Therefore, in the prior art, there is a problem that the use place or application of the nozzle is limited.
The present invention solves the above-described conventional technique, and an object thereof is to provide a spray device capable of reducing a noise value at the time of spraying while maintaining spray characteristics such as a particle size and a mist distribution. And

In order to achieve the above object, a spray device according to one aspect of the present invention comprises:
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;
The spray device main body has an outer end portion that is disposed at a tip of the spray device main body portion and covers 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 outer lid,
The gas is disposed between the inner lid portion and the outer lid portion, and is configured by a disk-shaped outer space between the inner end surface of the inner lid portion and the outer end surface of the outer lid portion, and the gas A gas-liquid mixing unit that mixes the gas flow flowing through the flow path and the liquid flow flowing through the liquid flow path;
A liquid that is provided to penetrate at least one place in the circumferential direction of the inner end surface of the inner lid portion, communicates with the gas-liquid mixing unit, and causes a liquid flow flowing through the liquid channel to flow into the gas-liquid mixing unit An inlet,
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,
A spout that is provided through the outer end surface of the outer lid portion and communicates with the gas-liquid mixing portion, and jets the atomized liquid by mixing the gas flow and the liquid flow in the gas-liquid mixing portion. And
A plurality of bowl-shaped depressions are provided on the front surface of the outer lid portion corresponding to the outer surface of the outer end portion of the outer lid portion.

  As described above, according to the spraying apparatus according to the above aspect of the present invention, a plurality of bowl-shaped depressions are provided on the front surface of the outer lid portion corresponding to the outer surface of the outer end portion of the outer lid portion, thereby atomizing. Many small turbulences generated by the jet of compressed gas ejected at the same time as the spraying of the liquid are generated around the spraying device to reduce the generated sound and to reduce the noise during spraying. With this configuration, it is possible to provide a spray device that sprays mist with a fine particle size and generates low noise during spraying, and can be used not only in front of a station or on the street, but also in a quiet environment such as indoors. It can also be used as a countermeasure and can be used for more various purposes.

FIG. 4 is a schematic cut end view of the spray device according to the embodiment of the present invention. Sectional drawing in the 1B-1B line | wire of FIG. 1A of the spraying apparatus in 1st Embodiment of this invention. External perspective view of the outer lid portion provided with a bowl-shaped depression on the front surface of the outer lid portion corresponding to the outer surface of the outer end portion of the outer lid portion The arrow view which looked at the outer cover part shown in FIG. 2A from the A direction of FIG. 2A Cut end view of the outer lid shown in FIG. 2A The arrow view seen from the A direction of FIG. 2A of the outer cover part which expanded the hollow shown to FIG. 2A Cut end view of the outer lid section cut along line EE in FIG. 2D Correlation diagram between hollow diameter and noise level FIG. 2A is an arrow view of the outer lid portion provided with depressions at regular intervals on the front surface of the outer lid portion as seen from the direction A in FIG. 2A. Cut section end view of the outer lid shown in FIG. 4A The arrow view seen from the A direction of FIG. 2A of the outer cover part which expanded the hollow shown to FIG. 4A Cut end view of the outer lid section cut along line D-D in FIG. 4C Correlation diagram between dent spacing and noise level Sectional drawing which shows schematic structure of the conventional spray apparatus

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, and examples of the gas include air, nitrogen, oxygen, or an inert gas. It is possible to select appropriately according to. 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.

[Embodiment]
In describing the embodiment of the present invention, the configuration of the spray device will be described first. FIG. 1A is a schematic cut end view of a spray device 10 according to an embodiment of the present invention. 1B is a cross-sectional view of the spray device 10 taken along line 1B-1B in 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 inner lid part 13 and the outer lid part 14 constitute a gas-liquid mixing part 15. The spray device 10 further includes a spray device lid fixing portion 17.

  The spraying device main body 10a includes a liquid channel 11 disposed along the axial direction at the center of the columnar member, and a cylindrical gas flow disposed along the axial direction with a space around the liquid channel 11 A path 12 is formed. The liquid flow path 11 and the gas flow path 12 are delimited by a cylindrical portion 10b located at the center as a part of the spray device main body 10a. The liquid flow path 11 shows only the front end side, and a liquid supply port (not shown) at the rear end is connected to a pump connected to the liquid tank via a water supply pipe, for example. 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 liquid flow path 11, and has a substantially C-shaped cross section having a flat inner end surface 13a. In the inner lid portion 13, a first gap 22 having a disk-like outer shape is formed between the end surface of the cylindrical portion 10 b and the inner surface of the inner end surface 13 a of the inner lid portion 13. A liquid inflow port 18 penetrating the inner end surface 13a in the axial direction is formed at one position on the outer peripheral portion of the inner end surface 13a of the inner lid portion 13. That is, the liquid inlet 18 is located on the inner end surface 13a of the inner lid portion 13 that is an upstream flat surface near the outer peripheral wall surface of the gas-liquid mixing portion 15, and the liquid flow path 11 and the gas-liquid mixing portion 15 are connected to each other. Communicate.

  The outer lid portion 14 is disposed at the tip of the spraying device main body portion 10a, covers the inner lid portion 13, covers the opening of the gas flow path 12, and has a flat outer end surface facing the inner end surface 13a of the inner lid portion 13. It has a substantially Ω-shaped cross section having an outer end portion 14a having an outer lid portion side surface 14c corresponding to a cylindrical side surface. The outer lid portion 14 covers the second gap 23 having a cylindrical outer shape with a predetermined interval at the side portion between the outer lid portion 13 and the predetermined interval at the end portion between the outer lid portion 14 and the inner lid portion 13. Is sandwiched between the end face of the spraying device main body 10a and the spraying device lid fixing portion 17 so as to cover the inner lid 13 while forming the gas-liquid mixing portion 15 in the disk-shaped outer space as a gap. It is fixed. 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.

  In order to reliably form the gas-liquid mixing portion 15 having a disc-like outer shape with a predetermined interval between the outer lid portion 14 and the inner lid portion 13, an annular protrusion is formed on the inner surface of the outer end portion 14 a of the outer lid portion 14. A portion 24 is formed so that the gas-liquid mixing portion 15 can be forcibly arranged as a gap between the inner surface of the outer lid portion 14 and the inner end surface 13a of the inner lid portion 13. The annular convex portion 24 may be provided on the inner end surface 13 a of the inner lid portion 13 instead of being provided on the inner surface (that is, the outer end surface) of the outer end portion 14 a of the outer lid portion 14. 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 liquid flow path 11.

  In addition, a gas inlet 19 that communicates the gas flow path 12 and the gas-liquid mixing unit 15 is formed on the side of the gas-liquid mixing unit 15 by cutting out a part of the annular projection 24 in the radial direction. ing. Therefore, the gas inlet 19 is arranged so that the inflow direction of the gas flow flowing from the gas inlet 19 intersects the inflow direction of the liquid flow flowing from the liquid inlet 18. The gas inlet 19 is located at a position facing the liquid inlet 18, which 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 at the center of the outer surface of the outer end portion 14a of the outer lid portion 14, and the outer end jet port 16a penetrating the outer end portion 14a and the cylindrical portion in the axial direction, and the cylindrical portion are provided. The jet part 16 which has the tubular flow path 16b which penetrates to the jet outlet 16a and the gas-liquid mixed fluid inflow port 16c of the inner end of the tubular flow path 16b is formed. The jet outlet 16 a, the tubular channel 16 b, and the gas-liquid mixed fluid inlet 16 c are all disposed on the same central axis 27 as the 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 portion 15 is formed by being surrounded by the annular convex portion 24, the inner lid portion 13 and the outer lid portion 14, and the liquid inlet 18 penetrating the inner lid portion 13 along the axial direction. In addition, the gas inflow port 19 is formed by cutting out the annular convex portion 24 along the direction intersecting the axial direction, and the jet port 16a penetrating the outer lid portion 14 along the axial direction.

  In such a configuration, the liquid supplied to the spraying device 10 flows into the liquid flow path 11 from the liquid supply port (not shown) to the front end side of the device with respect to the spraying device main body 10a, and becomes a liquid flow. The gas is then supplied to the gas-liquid mixing unit 15 through the first gap 22 and the liquid inlet 18. In addition, the gas supplied to the spray 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 spray device main body 10a, and becomes a gas flow. 23 and the gas inlet 19 are supplied to the gas-liquid mixing unit 15.

  When the gas flow and the liquid flow are supplied to the gas-liquid mixing unit 15, they are mixed with each other in the gas-liquid mixing unit 15, and after the liquid is atomized, the ejection unit 16 provided in the outer lid unit 14. The gas-liquid mixed fluid inlet 16c passes through the tubular flow channel 16b, and the mixed and atomized liquid is ejected from the jet outlet 16a to the outside.

  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 liquid flow path 11 passes through the first gap 22, passes through the liquid inlet 18 provided in the inner lid portion 13, and as shown in FIG. From the vicinity of the convex portion 24, the liquid flow is supplied in the direction of the ejection portion 16 in parallel with the inner end surface 13 a of the inner lid portion 13.

  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. However, it collides with the liquid in the gas-liquid mixing unit 15. By colliding in this way, the liquid is pushed and spread on the outer end surface of the outer end portion 14a of the outer lid portion 14, becomes a thin film, and flows on the outer end surface of the outer end portion 14a. Furthermore, by flowing in the circumferential direction of the convex portion 24 from the outer end surface of the outer end portion 14a from this state, the thin film shape is changed to a finer droplet. Furthermore, the gas-liquid mixed flow containing the liquid droplets is further circulated and stirred along the wall surface that is the inner surface of the outer end portion 14a on the outer lid portion 14 side of the gas-liquid mixing unit 15, thereby further reducing the liquid droplets. It is possible to spray a liquid having a smaller particle diameter from the jet nozzle 16a.

  As a specific example, the gas-liquid mixing section 15 has an inner diameter of 6.0 mm and a height of 2.0 mm, and the jet outlet 16a and the gas-liquid mixed fluid inlet 16c of the jet section 16 each have a diameter of 1.0 mm. The tubular channel 16b has a diameter of 1.0 mm and a length of 3.0 mm, the liquid inlet 18 has a diameter of 0.7 mm, the gas inlet 19 has a rectangular shape, a width of 1.0 mm, and a height of 1.0 mm. The spraying device 10 of FIG.

  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 79.5 dB (A characteristic) when measured with a sound level meter at a position 1000 mm from the tip of the spraying device 10.

  In the spraying device 10 having the above-described configuration, the liquid atomized at the time of spraying and the compressed gas are simultaneously ejected from the ejection port 16a to form a jet. The flow velocity of the jet in the vicinity of the jet outlet 16a has reached the speed of sound, and the surrounding air is drawn into the jet due to the difference in velocity between the ambient air of the spraying device 10 and the compressed gas, and an entrainment flow is generated. The entrainment flow flows along the surface of the spray device 10 and forms a turbulent flow near the surface of the spray device. This is one of the causes of noise during spraying.

  FIG. 2A shows an outer lid 14 in which a plurality of bowl-shaped (in other words, hemispherical concave) depressions 20 are provided on an outer lid front 14b corresponding to the outer surface of the outer end 14a of the outer lid 14. It is an external perspective view. 2B is an arrow view of the outer lid portion 14 shown in FIG. 2A as viewed from the direction A of FIG. 2A. 2C is a cut end view of the outer lid portion 14 shown in FIG. 2A. At least a plurality of bowl-shaped depressions 20 are provided on the outer lid portion front surface 14b corresponding to the outer surface of the outer end portion 14a of the outer lid portion 14. As shown in FIG. 2C, each recess 20 has a semicircular cross section in the central axis direction. In other words, each recess 20 may have a semicircular or semi-elliptical cross-sectional shape perpendicular to the outer lid front surface 14b. With this configuration, a large number of small turbulent flows are generated around the spray device. As a result, not a large noise is generated by a large turbulent flow, but a large number of small turbulent flows caused by the depressions 20 are generated, so that the generated sound can be reduced as a whole, and the noise can be reduced. Preferably, the plurality of indentations 20 are arranged uniformly on one circle centered on the central axis of the jet port 16b on the outer lid front surface 14b, so that the central axis of the jet port 16b is the center. Noise can be reduced evenly in all directions. As described above, when the plurality of depressions 20 are arranged, if the depressions 20 are arranged uniformly, the noise reduction effect can be realized without unevenness depending on the direction.

  2D and 2E are an arrow view seen from the direction A of FIG. 2A of the outer lid part 14 in which the recess 20 shown in FIG. 2A is enlarged, and a cut end view cut along the line EE of FIG. 2D. is there. In plan view, the recess 20 has a circular recess edge 20a and is provided on the outer lid front surface 14b with a certain depth. Here, the recess edge 20a is a curve or a straight line formed by connecting points where the depth from the bottom end of the recess 20 is 99% of the distance between the front surface 14b of the outer lid portion and the bottom end of the recess 20. The diameter of a circle or regular polygon drawn by the recess edge 20a is defined as a recess diameter 20b, and the distance between the outer lid front surface 14b and the bottom end of the recess 20 is defined as a recess depth 20c. In addition, in this embodiment, the hollow edge 20a is circular, and the cross-sectional shape parallel to the outer cover part front surface 14b of the hollow 20 is a perfect circle, but the shape of the hollow edge 20a may be a regular polygon, etc. It is not limited to a circle.

  In the present embodiment, as a specific example, the recess 20 having a recess diameter 20b of 1.0 mm and a recess depth 20c of 0.5 mm is set to have a radius 1.5 to 7. The recess 20 was provided so that the adjacent recess 20 was in contact with the outer lid front surface 14b in the range of 5 mm.

  When the spray device 10 incorporating the outer lid portion 14 having the above-described configuration was measured under the same conditions as those described above, the noise value was 76.9 dB (A characteristic), compared to a configuration in which the depression 20 was not provided. There was a noise reduction effect of -2.6 dB (A characteristic).

  FIG. 3 shows the correlation between the recess diameter 20b of the recess 20 and the noise value. The noise value decreased as the recess diameter 20b of the recess 20 increased from 0.25 mm, showed a minimum value at 1.0 mm, and increased as the value increased from 1.5 mm to 3.0 mm. Further, a noise reduction effect of −1 dB was observed when the recess diameter 20b was 0.25 mm or more and 2.5 mm or less. From the above, the recess diameter 20b of the recess 20 is preferably 0.25 mm or more and 2.5 mm or less, and more preferably 1.0 mm because the noise value is minimized.

  FIG. 4A is an arrow view of the outer lid part 14 in which the depressions 20 are provided in the outer lid part front face 14b at regular depression intervals 20d as seen from the direction A in FIG. 2A. 4B is a cut end view of the outer lid portion 14 shown in FIG. 4A. 4C and FIG. 4D are respectively an arrow view seen from the direction A in FIG. 2A of the outer lid portion 14 in which the recess 20 shown in FIG. 4A is enlarged, and an outer lid portion cut along the line DD in FIG. 4C. It is a cut end view. Here, the shortest distance between the recess edges 20a of the adjacent recesses 20 is defined as a recess interval 20d. The recesses 20 are provided in the outer lid front surface 14b at regular intervals 20d, for example, evenly. With the above configuration, a large number of small disturbances can be generated around the spray device to reduce the generated sound and reduce the noise.

  Specifically, the recess 20 having a recess diameter 20b of 1.0 mm and a recess depth 20c of 0.5 mm is formed on the front surface of the outer lid portion having a radius in the range of 1.5 mm to 7.5 mm with the jet port 16a as the center. 14b was equally provided so that the recess interval 20d was 0.5 mm.

  When the spray device 10 incorporating the outer lid portion 14 having the above-described configuration was measured under the same conditions as those described above, the noise value was 77.6 dB (A characteristic), compared to a configuration without the depression 20. There was a noise reduction effect of -1.9 dB (A characteristic).

  FIG. 5 shows the correlation between the recess interval 20d of the recess 20 and the noise level. The noise value of the recess 20 increased as the recess interval 20d increased from 0 mm, and the noise value reduction effect was less than -1 dB at 1.5 mm or more. From the above, the recess interval 20d of the recesses 20 is preferably 0 mm or more and 1.0 mm or less, and when 0 mm, the noise value is minimized, which is more preferable.

  According to the embodiment, the outer lid portion front surface 14b corresponding to the outer surface of the outer end portion 14a of the outer lid portion 14 is provided with a plurality of mortar-shaped depressions 20 so as to be ejected at the same time as the atomized liquid is sprayed. By generating a large number of small disturbances around the spraying device generated by the jet of compressed gas generated, the generated sound can be reduced and the noise during spraying can be reduced. With this configuration, it is possible to provide a spray device 10 that sprays a mist having a fine particle diameter and generates low noise during spraying, and is used not only in front of a station or on a street but also in a quiet environment such as indoors. It can also be used as a countermeasure against heat, and can be used for more various purposes.

  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 device according to the above aspect of the present invention is a spraying device capable of spraying a liquid with a fine and low noise, and this spraying device is used for cooling a space or a substance, humidifying, chemical spraying, combustion, or dust countermeasures. It can be used widely and can be used not only in front of the station or on the street, but also as a countermeasure against heat in a quiet environment such as indoors.

DESCRIPTION OF SYMBOLS 10 Spraying apparatus 10a Spraying apparatus main-body part 11 Liquid flow path 12 Gas flow path 13 Inner cover part 13a Inner end surface 14 Outer cover part 14a Outer end part 14b Outer cover part front 15 Gas-liquid mixing part 16 Ejection part 16a Ejection port 16b Tubular flow Channel 16c Gas-liquid mixed fluid inlet 17 Spraying device lid fixing portion 18 Liquid inlet 19 Gas inlet 20 Indentation 20a Indentation edge 20b Indentation diameter 20c Indentation depth 20d Indentation interval 22 First clearance 23 Second clearance 24 Annular convex Part 27 central axis

Claims (4)

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;
The spray device main body has an outer end portion that is disposed at a tip of the spray device main body portion and covers 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 outer lid,
The gas is disposed between the inner lid portion and the outer lid portion, and is configured by a disk-shaped outer space between the inner end surface of the inner lid portion and the outer end surface of the outer lid portion, and the gas A gas-liquid mixing unit that mixes the gas flow flowing through the flow path and the liquid flow flowing through the liquid flow path;
A liquid that is provided to penetrate at least one place in the circumferential direction of the inner end surface of the inner lid portion, communicates with the gas-liquid mixing unit, and causes a liquid flow flowing through the liquid channel to flow into the gas-liquid mixing unit An inlet,
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,
A spout that is provided through the outer end surface of the outer lid portion and communicates with the gas-liquid mixing portion, and jets the atomized liquid by mixing the gas flow and the liquid flow in the gas-liquid mixing portion. And
A spraying device comprising a plurality of bowl-shaped depressions in front of the outer lid corresponding to the outer surface of the outer end of the outer lid.   2. The spray according to claim 1, wherein the hollow has a semicircular or semi-elliptical cross-sectional shape perpendicular to the front surface of the outer lid portion and a circular shape in parallel with the front surface of the outer lid portion. apparatus.   The spraying device according to claim 1 or 2, wherein a recess diameter of the recess is not less than 0.25 mm and not more than 2.5 mm.   The spray device according to any one of claims 1 to 3, wherein the recess has a recess interval of 0 mm or more and 1.0 mm or less.

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