WO2019065405A1 - Nozzle and spray - Google Patents

Abstract

The present invention relates to a spray nozzle 18 provided with: a hose body 14 which has a first flow path 15 for supplying a spray liquid; a second flow path which surrounds the pipe body and which serves to supply air, the surface area of the second flow path gradually contracting towards the front end 14c of the pipe body; and a spray aperture 19 which is located separately from the front end of the pipe body and which serves to spray fine drops of liquid from the spray liquid Lf, the aperture diameter of the spray opening being less than to the opening diameter of the front end of the pipe body. The present invention also relates to an example of jet deformation and the constitution of a sprayer 10 provided with the nozzle.

Description

Nozzle and spray

The present invention relates to nozzles and sprays for sprays.

Spraying technology for forming various liquid droplets into fine droplets by gas is used in many applications such as drying granulation, painting, sintering granulation, sterilization and disinfection, and pesticide spraying. By forming the liquid into fine droplets with gas, the surface area can be increased to accelerate processes such as drying and reaction, or droplets can be cooled by adiabatic expansion of the gas. The liquid to be sprayed is diverse, such as a paint, a dispersion containing fine particles, a liquid containing a thickening gel, and the like.

There is known a nozzle having a structure in which gas and a liquid to be sprayed are pressurized, and the gas flowing in the outer ring flow path is made to enter the inner pipe flow path in which the liquid flows, mixed and jetted inside the nozzle (for example, patent document 1)).

International Publication No. 2017/040314

An object of the present invention is to provide a nozzle that is capable of being finely divided into various types of spray liquids and that is less susceptible to clogging, and a spray comprising the nozzle.

According to one aspect of the present invention, there is provided a nozzle for spraying, comprising: a tubular body having a first flow path for supplying a spray liquid; and a second flow path for supplying a gas surrounding the tubular body. The second flow path is provided separately from the second flow path whose flow path area is gradually reduced toward the tip of the pipe and the tip of the pipe. An injection port for injecting fine droplets of the spray liquid, wherein the opening diameter of the injection port is smaller than the opening diameter of the tip of the tubular body; Be done.

According to the above aspect, since the second flow path for gas supply surrounding the pipe having the first flow path for supplying the spray liquid is gradually reduced toward the tip of the pipe. The linear velocity of the gas flowing through the second flow path is increased and injected. As a result, the gas having an increased linear velocity collides with the spray liquid to promote the formation of fine droplets of the spray liquid, and the content of the liquid is less likely to adhere to the vicinity of the injection port of the nozzle and clogging is less likely to occur. Further, since the opening diameter of the injection port provided apart from the tip of the tubular body is smaller than the opening diameter of the tip of the tubular body, it becomes easier to mix the spray liquid and the gas, It is possible to provide a nozzle in which microdroplet formation is promoted.

According to another aspect of the present invention, a first connection communicating with the rear end of the first flow passage connectable to the supply of the spray liquid, and a second flow connectable to the supply of the gas A spray is provided comprising a second connection in communication with the rear end of the channel and the nozzle of the above aspect.

According to the above aspect, it is possible to provide a spray including a nozzle capable of forming a fine droplet of a spray liquid and less likely to cause clogging.

FIG. 1 is a cross-sectional view of a spray according to an embodiment of the present invention. It is a sectional view of a nozzle concerning one embodiment of the present invention. It is a figure which shows the motion at the time of injection of the nozzle which concerns on one Embodiment of this invention. It is a sectional view of the modification (modification 1) of the nozzle concerning one embodiment of the present invention. It is sectional drawing of the modification (modification 2) of the nozzle which concerns on one Embodiment of this invention. It is a sectional view of the modification (modification 3) of the nozzle concerning one embodiment of the present invention. It is sectional drawing of the modification (modification 4) of the nozzle which concerns on one Embodiment of this invention. It is sectional drawing of the modification (modification 5) of the nozzle which concerns on one Embodiment of this invention. It is a figure which shows the characteristic of the spray liquid used for one Example of this invention.

Hereinafter, an embodiment of the present invention will be described based on the drawings. Note that elements common to multiple drawings are given the same reference numerals, and repeated description of the elements is omitted.

FIG. 1 is a cross-sectional view of a spray according to an embodiment of the present invention. Referring to FIG. 1, in the spray 10 according to the present embodiment, a casing 11 is provided with a first connection portion 12 connectable to a spray liquid supply source. For example, a pump 21 from a container 21 storing the spray liquid. The spray liquid Lf is supplied to the 1st connection part 12 by this. In the spray 10, the casing 11 is further provided with a second connection portion 13 connectable to a gas supply source. For example, the gas Gf is secondly supplied from the gas cylinder 23 or the gas tank via the valve 24 by a compressor or a dryer. It is supplied to the connection unit 13.

The casing 11 has a tube 14 inside. The tubular body 14 has a first flow passage 15, and a first connection 12 is provided at the rear end 14d. The casing 11 has a second flow passage 16 formed by the inner surface (hereinafter referred to as "large diameter surface") 11a and the outer surface (hereinafter referred to as "small diameter surface") 14b of the tubular body 14. The second flow passage 16 is formed to surround the tubular body 14 and is, for example, an annular shape. The central axis X of the second flow passage 16 is substantially common to the central axis of the tubular body 14.

The spray 10 is provided with a nozzle 18 at the tip of the casing 11. The spray liquid Lf is formed into fine droplets by mixing the spray liquid ejected from the opening of the tip 14 c of the tube 14 and the gas ejected from the outlet 16 a of the second flow path 16 inside the nozzle 18. And injected from the injection port 19.

The spray liquid Lf is not particularly limited, and is, for example, a solution, a dispersion, a liquid containing a gel-like substance, or an emulsion. The spray liquid Lf is, for example, a paint, a chemical solution such as an agricultural chemical or a disinfectant, a high salt concentration solution, a high viscosity polymer dispersion, or a dispersion in which fine particles having a particle size of nanometer or micrometer are dispersed in a liquid , And the like. The spray liquid Lf is stored in the container 21, pressurized by, for example, a pump 22 capable of adjusting the flow rate, fed, and supplied to the first flow path 15 via the first connection portion 12.

The gas Gf is not particularly limited, and is, for example, air, nitrogen, oxygen, or argon, and in particular, dry air or dry nitrogen can be used. The gas Gf is compressed and pressurized (for example, 3 to 7 atm) and supplied to the second flow path 16 through the second connection portion 13.

FIG. 2 is a cross-sectional view of a nozzle according to an embodiment of the present invention. Referring to FIG. 2, the tip 14 c of the tube 14 having the first flow path 15 is disposed inside the nozzle 18. Furthermore, the outlet of the second flow passage 16 formed by the large diameter surface 11 a which is the inner wall surface of the casing 11 and the small diameter surface 14 b which is the outer surface of the tubular body 14 is disposed inside the nozzle 18.

The second flow passage 16 is configured such that the flow passage area is gradually reduced toward the tip 14 c of the tube 14. As a result, the linear velocity of the gas Gf flowing through the second flow passage 16 is increased and the gas Gf collides with the spray liquid Lf at a high speed by being jetted from the outlet 16a. As a result, the contents of the spray liquid Lf are less likely to adhere to the vicinity of the injection port 19 of the nozzle 18, and clogging is less likely.

The large diameter surface 11 a of the second flow passage 16 may be formed to be gradually advanced toward the center axis X of the tube 14 toward the tip 14 c of the tube 14. With such a configuration, the gas Gf jetted from the outlet 16 a flows in the direction of the central axis X of the tube 14 in the space between the tip 14 c of the tube 14 and the injection port 19 so that the tip 14 c of the tube 14 is As the gas Gf can penetrate more into the interior of the first flow path 15 from the opening, the spray liquid Lf and the gas Gf ejected from the first flow path 15 are further mixed, and the spray liquid Lf becomes finer. Dropletized. The large diameter surface 11 a can be formed in a straight shape in the cross section along the central axis X direction toward the injection port 19.

Furthermore, it is preferable that the second flow path 16 has the smallest flow area at the outlet 16 a. Thereby, the linear velocity of the gas Gf ejected from the outlet 16a of the second flow passage 16 is maximized, and the gas Gf can penetrate deeper into the inside of the first flow passage 15 from the opening of the tip 14c of the tube 14 Therefore, the formation of fine droplets of the spray liquid Lf is further promoted.

The second flow passage 16 is preferably configured such that the distance between the small diameter surface 14b and the large diameter surface 11a is minimized at the outlet 16a. Thereby, the flow passage area of the second flow passage 16 can be minimized. The distance between the small diameter surface 14b and the large diameter surface 11a at the outlet 16a is appropriately selected according to the maximum gas flow rate and the gas supply pressure when using the spray 10, but the clogging of the nozzle 18 can be reduced. And preferably 0.01 mm to 0.20 mm.

In addition to the rectangular shape shown in FIG. 2, the cross-section along the central axis X of the tip 14c of the tubular body 14 may be any of an acute-angled shape, a circular shape, an elliptical shape, and a combination thereof.

The opening diameter D1 of the injection port 19 is smaller than the opening diameter D2 of the tip 14c of the tube body 14. As a result, the spray liquid Lf is sufficiently mixed with the gas Gf between the opening of the tip 14 c of the tubular body 14 and the injection port 19, and the spray liquid Lf is formed into fine droplets.

The inner surface 18a of the nozzle 18 is formed continuously with the large diameter surface 11a of the second flow passage 16 inside the injection port 19, and the inner diameter thereof is gradually reduced in the injection direction. Is preferred.

The nozzle 18 is preferably configured such that the inner surface 18b of the nozzle 18 is gradually enlarged in its diameter toward the injection direction outside the injection port 19. This makes it possible to control the spread of the injection flow to a desired range.

The nozzle 18 according to the present embodiment is configured such that the tip 14 c of the tube 14 vibrates at least in the radial direction (perpendicular to the central axis X) during use, ie, when spraying the spray liquid. It is also good. An example is described below.

FIG. 3 is a view showing the movement of the tip of the tubular body when spraying the spray liquid of the nozzle according to the embodiment of the present invention. FIGS. 3 (a) and 3 (b) show successive frames of video taken every 1 .mu.sec with a high-speed video camera using a nozzle that sprays the spray liquid Lf and the gas Gf from the left side to the right side of the drawing. Referring to FIG. 3A, at the outlet 16a of the second flow passage, the distance between the large diameter surface 11a on the upper side of the drawing and the small diameter surface 14b is the distance between the large diameter surface 11a on the lower side of the drawing and the small diameter surface 14b. It turns out that it is bigger than that. Referring to FIG. 3B, after 1 μs from FIG. 3A, the distance between the large diameter surface 11a and the small diameter surface 14b on the lower side of the drawing is the same as the large diameter surface 11a and the small diameter surface 14b on the drawing upper side. It can be seen that the distance between the From this, it can be seen that the tip 14c of the tube vibrates at least up and down. Thereby, at the outlet 16a of the second flow path, the distance between the large diameter surface 11a and the small diameter surface 14b, that is, the size of the opening of the outlet 16a changes at high speed in the circumferential direction. The linear velocity changes. As a result, the linear velocity of the injection of the gas Gf is partially increased in the circumferential direction, and even if the content of the liquid Lf adheres to the outlet 16 a of the second flow passage or the vicinity of the injection port 19 of the nozzle 18. It can be easily removed. This makes it possible to provide the nozzle 18 which is less likely to be clogged.

In order to cause the tip end 14c of the tubular body 14 to vibrate, the tubular body 14 may be formed of an elastic body, and the support portion of the rear end of the tubular body 14 may be formed of an elastic body.

In this example, the distance (gap) between the large diameter surface 11a and the small diameter surface 14b at the outlet 16a of the second flow passage is about 0.020 mm in design, and the amplitudes of FIGS. 3 (a) and 3 (b) are Since the width is about 0.013 mm, in FIGS. 3A and 3B, the narrow gap is about 0.007 mm and the wide gap is about 0.033 mm.

The nozzle 18 of the spray 10 according to the present embodiment has a second flow path 16 for gas supply surrounding the pipe body 14 having the first flow path 15 for supplying the spray liquid Lf, and the flow path area thereof is the tip 14 c of the pipe body 14 The linear velocity of the gas Gf flowing through the second flow passage 16 is increased and jetted from the outlet 16a. As a result, the gas Gf having an increased linear velocity collides with the spray liquid Lf to promote the formation of fine droplets of the spray liquid Lf, and the contents of the liquid Lf are less likely to adhere to the vicinity of the injection port 19 of the nozzle 18 And clogging is less likely to occur. Furthermore, the nozzle 18 has an opening diameter D1 of the injection port 19 provided at a distance from the tip 14c of the tube 14 smaller than the opening diameter D2 of the tip 14c of the tube 14, so the spray liquid Lf and the gas Gf As a result, it becomes easier to mix and promote the formation of fine droplets of the spray liquid Lf. Therefore, it is possible to provide the nozzle 18 which can make the spray liquid Lf into fine droplets and is less likely to cause clogging.

Furthermore, the spray 10 of the present embodiment can provide a spray that is capable of making the spray liquid Lf into fine droplets and that is resistant to clogging.

Hereinafter, the modification of the nozzle concerning one embodiment of the present invention is explained. In the modification, a configuration different from the nozzle of FIG. 2 described above will be described, and the same configuration will be assigned the same reference numerals as FIG. 2 and the description will be omitted. Further, the same effects can be obtained from similar configurations whose description is omitted. In order to simplify the description, the description of the effect is omitted.

FIG. 4 is a cross-sectional view of a modified example (modified example 1) of a nozzle according to an embodiment of the present invention. Referring to FIG. 4, the nozzle 118 of the first modification is formed to be gradually thinner so that the inner surface 114 a of the tube body 114 expands toward the tip end 114 c. The nozzle 118 has the same configuration as the nozzle 18 according to the present embodiment of FIG. 2 except this point. As a result, the gas Gf jetted from the outlet 16 a of the second flow passage 16 easily enters the first flow passage 15 from the opening of the tip end 114 c of the tubular body 114, whereby the spray jetted from the first flow passage 15 It is possible to further promote the formation of fine droplets of the liquid Lf. Although illustration is omitted, the tube body 114 may be gradually thinned so that the outer surface, that is, the small diameter surface 14b, is reduced toward the tip end 114c.

FIG. 5 is a cross-sectional view of a modified example (modified example 2) of a nozzle according to an embodiment of the present invention. Referring to FIG. 5, in the nozzle 218 of the second modification, the small diameter surface 214b of the second flow passage 16 forming the outer surface of the tube 214 gradually approaches the large diameter surface 11a toward the tip 214c. And the inner surface 214a of the tubular body 214 is also formed. The nozzle 218 has the same configuration as the nozzle 18 according to the present embodiment of FIG. 2 except this point. As a result, the gas Gf jetted from the outlet 16 a of the second flow passage 16 easily enters the first flow passage 15 from the opening of the tip end 214 c of the tubular body 214, whereby the spray jetted from the first flow passage 15 It is possible to further promote the formation of fine droplets of the liquid Lf. The cross-sectional shape along the central axis X of the inner surface 214a of the tubular body 214 may be a divergent shape shown in FIG. 5, and may be, for example, a horn shape or a bell shape.

FIG. 6 is a cross-sectional view of a modified example (modified example 3) of a nozzle according to an embodiment of the present invention. Referring to FIG. 6, in the nozzle 318 of the third modification, the shape of the inner surface 318 a of the nozzle 318 directed from the large diameter surface 311 a of the second flow passage 16 to the injection port 19 is a cross section along the central axis X direction, It is a quadratic function shape which is concave toward the inside of the nozzle 318. The inside of the nozzle 318 has the same configuration as the nozzle 218 of the second modification of FIG. 5 except this point. Thereby, the gas Gf flows through the second flow path 16 and the gas Gf ejected from the outlet 16 a flows in the direction of the central axis X of the pipe body 214 so that the gas Gf flows from the opening of the tip 214 c of the pipe body 214 to the inside of the first flow path 15. Can infiltrate more, and therefore, it is possible to further promote the formation of fine droplets of the spray liquid Lf ejected from the first flow path 15. The cross-sectional shape of the inner surface 318a is not limited to the quadratic function shape, and may be a higher-order function shape as long as it is concave.

The nozzle 318 is formed such that the diameter of the inner surface 318b on the outer side from the opening position of the injection port 19 gradually increases in diameter along the injection direction, and the inner surface 318b has a cross section along the central axis X direction. Is formed in a concave shape toward the This makes it easy to control the directionality of the spray flow of the injected fine droplets, and the spray flow can be spread immediately after the injection from the injection port 19, and the droplets grow due to the collision of the fine droplets. Can be suppressed.

FIG. 7 is a cross-sectional view of a modified example (modified example 4) of a nozzle according to an embodiment of the present invention. With reference to FIG. 7, in the nozzle 418 of the fourth modification, the shape of the inner surface 418 a of the nozzle 418 directed from the large diameter surface 411 a of the second flow passage 16 to the injection port 19 is a cross section along the central axis X direction, It is a quadratic function shape convex toward the inside of the nozzle 418. The inside of the nozzle 418 has the same configuration as the nozzle 218 of the second modification of FIG. 5 except this point. Thereby, the gas Gf flows through the second flow path 16 and the gas Gf ejected from the outlet 16 a flows in the direction of the central axis X of the pipe body 214 so that the gas Gf flows from the opening of the tip 214 c of the pipe body 214 to the inside of the first flow path 15. Can penetrate more and the fine droplets colliding with the inner surface 418a of the nozzle 418 are more likely to be mixed with the gas Gf jetted from the outlet 16a. It can be promoted. The cross-sectional shape of the inner surface 418a is not limited to the quadratic function shape, and may be a higher-order function shape as long as it is convex.

The nozzle 418 is formed such that the diameter of the inner surface 418b on the outer side from the opening position of the injection port 19 gradually increases in diameter in the injection direction, and the inner surface 418b has a cross section along the central axis X direction. Are formed in a convex shape. As a result, it becomes difficult for the jetted fine droplets to adhere to the inner surface 418b, and clogging can be suppressed. Also, the spray flow of fine droplets can be spread in the shape of a horn.

FIG. 8 is a cross-sectional view of a modified example (modified example 5) of a nozzle according to an embodiment of the present invention. Referring to FIG. 8, in the nozzle 518 of the fifth modification, the open end 519 a of the injection port 519 protrudes toward the tip of the tubular body 14, and from the large diameter surface 511 a of the second flow path 16 to the open end 519 a The shape of the inner surface 518a of the facing nozzle 518 has a concave shape toward the inside of the nozzle 318 in a cross section along the central axis X direction. The nozzle 518 has the same configuration as the nozzle 18 according to the present embodiment of FIG. 2 except this point.

Thereby, the second flow path 16 flows, and a part of the gas Gf ejected from the outlet 16a flows along the open end 519a which protrudes from the inner surface 518a of the nozzle 518, and the first flow from the opening of the tip 14c of the tube 14 Since a larger amount of gas Gf can penetrate into the inside of the passage 15, the mixture with the spray liquid Lf can be further mixed to further promote the formation of fine droplets of the spray liquid Lf.

The open end 519a of the injection port 519 can be applied to the nozzles 118, 218, 318 and 418 of the first to fourth modifications described above. Thereby, the same effect as the fifth modification is obtained.

[Example]
As an example, a spray test was conducted using the spray 10 according to the present embodiment shown in FIG. 1 provided with the nozzle 18 according to the present embodiment shown in FIG. The tubular body 14 having the second flow path 15 of the spray liquid is made of quartz glass with an inner diameter of 0.3 mm, and the casing 11 is a processed borosilicate glass tube. The opening diameter of the injection port 19 was 0.2 mm. The distance (clearance) between the large diameter surface 11 a of the outlet 16 a of the second flow passage 16 and the small diameter surface 14 b was 0.020 mm. As the spray liquid, a rice flour dispersion having a concentration of 5% by weight based on the weight of water was used.

FIG. 9 is a diagram showing the characteristics of the spray liquid used in one embodiment of the present invention. Referring to FIG. 9, the particle size distribution of the rice flour dispersion is a particle size distribution measured with a stirrer using a laser diffraction type particle size distribution measuring device capable of measuring from 0.5 μm to 350 μm. The D ₅₀ (volume median diameter) was 38.5 μm, the D ₉₀ (volume 90% diameter) was 96.6 μm, and the D ₃₂ Sauter mean diameter (body surface area average) was 16.7 μm.

The rice flour dispersion was supplied to the spray at 10 mL / min, and nitrogen gas was supplied as a gas at a pressure of 7 atm at 1.7 L / min to conduct a continuous injection experiment. As a result, no clogging occurred even after 4 hours, and injection was normally performed.

Although the preferred embodiments of the present invention have been described above in detail, the present invention is not limited to the specific embodiments, and various changes and modifications may be made within the scope of the present invention as set forth in the claims. It is possible. For example, the configurations of the nozzle according to the embodiment and the nozzles of the first to fifth modifications may be combined with each other.

In addition, the nozzle and spray according to a preferred embodiment of the present invention are spray drying, spray application, spray sintering, spray sterilization, spray humidification, spray cooling, sample introduction for drug dispersion and chemical analysis, chemical solution application, particle formation Can be used in a wide range of applications such as ionization.

The following appendices will be disclosed as further embodiments of the above description.
(Supplementary Note 1) A nozzle for spraying,
A tube having a first flow path for supplying a spray liquid;
A second flow path for supplying gas, which surrounds the pipe body, the second flow path having a flow path area gradually reduced toward the tip of the pipe body. And the flow path of
An injection port provided so as to be separated from the front end of the tubular body and injecting a fine droplet of the spray liquid, wherein the opening diameter of the injection port is smaller than the opening diameter of the front end of the tubular body The injection port,
The nozzle.
(Supplementary Note 2) The nozzle according to Supplementary note 1, wherein the tubular body is made of an elastic body, and the tip is configured to be at least radially oscillatable.
(Supplementary Note 3) The nozzle according to Supplementary note 1, wherein the tip end of the tubular body is configured to be at least able to vibrate in the radial direction by gas ejection from the outlet of the second flow passage.
(Supplementary Note 4) The nozzle according to any one of Supplementary notes 1 to 3, wherein the second flow path has the smallest flow area at its outlet.
(Supplementary Note 5) The nozzle according to any one of Supplementary notes 1 to 4, wherein the tubular body is gradually formed thin so that the inner diameter thereof is expanded toward the tip.
(Supplementary Note 6) The second flow path is formed of a large diameter surface and a small diameter surface, and the large diameter surface is gradually advanced toward the injection port in the central axis direction of the tube. The nozzle according to any one of the above.
(Supplementary Note 7) The shape in which the large diameter surface is directed to the injection port is such that the cross section along the central axis direction is a linear shape or a quadratic function shape concave or convex toward the inside of the nozzle The nozzle according to 6.
(Supplementary note 8) The nozzle according to supplementary note 6 or 7, wherein the small diameter surface is an outer surface of the tube and is parallel to a central axis of the tube.
(Supplementary Note 9) The small diameter surface is the outer surface of the tube, and the diameter is gradually expanded toward the tip of the tube so as to approach the large diameter surface, and the inner surface of the tube is enlarged. The nozzle according to appendix 6.
(Supplementary note 10) The nozzle according to any one of supplementary notes 6 to 9, wherein the open end of the injection port continuous with the large diameter surface protrudes toward the tip of the tubular body.
(Supplementary note 11) The second flow path according to any one of supplementary notes 6 to 10, wherein the distance between the large diameter surface and the small diameter surface is 0.01 mm to 0.20 mm at the outlet thereof. Nozzle.
(Supplementary note 12) The nozzle according to any one of supplementary notes 1 to 11, wherein the first flow path and the second flow path have a common central axis.
(Supplementary note 13) The nozzle according to any one of supplementary notes 1 to 12, wherein the injection port is formed such that the diameter of the inner surface outside the opening position gradually increases in diameter along the ejection direction.
(Supplementary Note 14) The nozzle according to Supplementary note 13, wherein the injection port is formed such that a cross section along the central axis direction is concave or convex toward the central axis on the inner surface outside the opening position.
(Supplementary Note 15) The nozzle according to any one of supplementary notes 1 to 14, wherein the spray liquid is a solution, a dispersion, a liquid containing a gel-like substance, or an emulsion.
(Supplementary Note 16) A first connection portion in communication with the rear end portion of the first flow path connectable to the spray liquid supply source;
A second connection communicating with the rear end of the second flow passage connectable to the gas supply source;
The nozzle according to any one of appendices 1 to 15, and
Spray with.
(Supplementary note 17) The spray according to supplementary note 16, wherein the gas and the spray liquid are supplied under pressure.
(Supplementary note 18) The spray according to supplementary note 16 or 17, wherein the gas is heated and supplied.
(Supplementary note 19) The spray according to any one of supplementary notes 16 to 18, wherein the spray liquid is a solution, a dispersion, a liquid containing a gel-like substance, or an emulsion.

DESCRIPTION OF SYMBOLS 10 Spray 11 Casing 11a, 411a, 511a Large diameter surface 12 1st connection part 13 2nd connection part 14, 114, 214 Tube body 14b, 214b Small diameter surface 14c, 214c Tip of tube body 15 1st flow path 16 2nd flow Passage 16a second passage outlet 18, 118, 218, 318, 418, 518 Nozzle 19 Injection port

Claims (14)

A nozzle for spraying,
A tube having a first flow path for supplying a spray liquid;
A second flow path for supplying gas, which surrounds the pipe body, the second flow path having a flow path area gradually reduced toward the tip of the pipe body. And the flow path of
An injection port provided so as to be separated from the front end of the tubular body and injecting a fine droplet of the spray liquid, wherein the opening diameter of the injection port is smaller than the opening diameter of the front end of the tubular body The injection port,
The nozzle. The nozzle according to claim 1, wherein the tube is made of an elastic body, and a tip of the tube is configured to be at least radially oscillatable. The nozzle according to claim 1, wherein the tip of the tube is configured to be at least radially oscillatable by the ejection of gas from the outlet of the second channel. The nozzle according to any one of claims 1 to 3, wherein the second flow path has the smallest flow area at its outlet. The nozzle according to any one of claims 1 to 4, wherein the tubular body is formed to be thinner gradually so that the inner diameter thereof is expanded toward the tip. The second flow path is formed by a large diameter surface and a small diameter surface, and the large diameter surface is gradually advanced toward the central axis of the tube toward the injection port. The nozzle according to any one of the preceding claims. The shape in which the large diameter surface is directed to the injection port is a quadratic function shape in which the cross section along the central axis direction is linear or concave or convex toward the inside of the nozzle. nozzle. The small diameter surface is an outer surface of the tube, and the diameter is gradually expanded toward the tip of the tube so as to approach the large diameter surface, and the inner surface of the tube is enlarged. The nozzle according to 6. The nozzle according to any one of claims 6 to 8, wherein the open end of the injection port continuous with the large diameter surface protrudes toward the tip of the tube. The nozzle according to any one of claims 6 to 9, wherein a distance between the large diameter surface and the small diameter surface is 0.01 mm to 0.20 mm at the outlet of the second flow path. The nozzle according to any one of claims 1 to 10, wherein the injection port is formed such that the diameter of the inner surface outside the opening position gradually increases in diameter from the opening position along the injection direction. The nozzle according to claim 11, wherein the injection port is formed such that an inner surface outside the opening position has a cross-sectional shape along the injection direction concave or convex toward the central axis of the injection port. A first connection portion in communication with the rear end of the first flow path connectable to the spray liquid supply source;
A second connection communicating with the rear end of the second flow passage connectable to the gas supply source;
The nozzle according to any one of claims 1 to 12;
Spray with. The spray according to claim 13, wherein the spray liquid is a solution, a dispersion, a liquid containing a gel-like substance, or an emulsion.

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