JPH08281155A - Injection of fine particle of liquid and nozzle - Google Patents

Abstract

PURPOSE: To inject a liquid in the form of fine particles so that it does not cause a clogging problem regardless of its type, and at the same time, increase an injection volume per unit time as fine liquid droplets. CONSTITUTION: A liquid is supplied to a slant surface 7, then the liquid supplied to the slant surface 7 is elongated thinly as a thin film current 8 using an air stream flowing rapidly along the slant surface 7, and the thin film current 8 is injected into a gas from the terminal of the slant surface 7 to obtain fine particles.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a nozzle for ejecting a liquid onto fine particles, and more particularly to a method and a nozzle for ejecting a liquid onto extremely small particles.

[0002]

2. Description of the Related Art Nozzles for converting liquid into ultrafine particles are used for various purposes. For example, when it is used for the purpose of spraying a drug solution into the air to form ultrafine particles, a drug that is easily absorbed by the human body can be produced.

As a nozzle for spraying a liquid onto ultrafine particles,
The ones shown in Figures 1 and 2 have been developed. The nozzle shown in FIG. 1 pressurizes liquid to supply it to a cylindrical air passage 1, mixes it with air in the air passage 1, and ejects it from the tip to eject the primary mist 2
And The ejected primary mists 2 collide with each other to become the secondary mists 3 and become finer particles. The nozzle having this structure can jet a liquid into fine particles of 10 μm or less.

The nozzle shown in FIG. 2 has a double tube,
Liquid is jetted from the central hole 4 and pressurized air is jetted from around the liquid. In the nozzle having this structure, the liquid ejected from the center is shaving by the surrounding air to form small droplets. The shaving by the air gradually advances to the central part of the liquid, but at this time, the speed of the air gradually decreases and the droplet becomes large. The liquid ejected to the central portion is impaired by the surrounding liquid droplets and is poorly mixed with the air, and the liquid droplets become large.

[0005]

The nozzles shown in FIGS. 1 and 2 have the feature that the liquid sprayed by the pressurized air can be made into fine liquid droplets. However, the nozzle shown in FIG. 1 can be used for non-adhesive liquids such as water, but not for adherent liquids. It takes a few minutes,
There is a drawback that the sprayed droplets adhere to the tip of the nozzle and dry, and further, they gradually accumulate and become clogged.
Therefore, the nozzle shown in FIG. 1 has a drawback that the liquid to be ejected is specified and various liquids cannot be sprayed with fine particles.

In the nozzle shown in FIG. 2, in order to make the liquid droplets into fine particles, it is necessary to make the central hole 4 extremely small and jet the liquid very finely. This is because when the central hole is thickened, the ejected liquid droplets become large. Therefore, the nozzle of this structure is
Since it is necessary to make the spray amount per unit time extremely small, the treatment amount and the miniaturization of the droplets have mutually contradictory characteristics, and there is a drawback that both characteristics cannot be satisfied. By the way, the particle size is 10
For the nozzle having a diameter of not more than μm, the inner diameter of the center hole needs to be not more than 0.2 mm. The spray quantity of the nozzle of this inner diameter is only 15 g / hour by dry weight. Such a small nozzle also has a drawback that it is very likely to be clogged.

Further, in both of the nozzles shown in FIGS. 1 and 2, the sprayed liquid droplets are sprayed in a full cone and cannot be sprayed in a hollow cone. The hollow cone is a state in which droplets are ejected in a cylindrical shape, and the entire inside is not filled with droplets. On the other hand, the full cone is a state in which the droplets ejected in a tubular shape are filled up to the inside. A nozzle for ejecting a liquid into fine droplets is often used for the purpose of rapidly drying the droplets ejected in the air or vaporizing the droplets in the air. The nozzles used in this application should spray the liquid with a hollow cone. This is because the droplets in the full cone are completely filled with droplets, so that the droplets in the central portion cannot be dried quickly or vaporized in the air.

The present invention was developed for the purpose of solving these drawbacks of the prior art, and an important object of the present invention is to jet a liquid into extremely small particles and not to clog various liquids. It is to provide a method and a nozzle for ejecting a liquid that can be used in a state into fine particles.

Further, another important object of the present invention is to provide a method and a nozzle for ejecting liquid into fine particles, which is capable of ejecting fine liquid droplets while increasing the ejection amount per unit time.

Still another important object of the present invention is to
It is also possible to inject liquid into the hollow cone if necessary,
It is an object of the present invention to provide a method and a nozzle for spraying fine particles of a liquid which can be dried efficiently or vaporized when sprayed on a hollow cone.

[0011]

In order to achieve the above-mentioned object, the present inventor prototyped a nozzle having a structure shown in FIG.
The nozzle in this figure has a triple-tube structure in order to eject the liquid in a ring shape, instead of ejecting the liquid from the center. Air is ejected from the center and the outer periphery, and the liquid is ejected in a ring shape from the intermediate supply port 5. Using the nozzle of this structure, atomizing air of 6.5 kg / cm ² from the center and spraying air of 1 kg / cm ² from the outer periphery are sprayed to obtain fine particles having a particle diameter of 5 μm. Successful. However, in the nozzle having this structure, it is extremely difficult to adjust the supply port 5 for ejecting the liquid, and if the adjustment is deviated, the particle diameter of the fine particles rapidly increases to 20 to 30 μm or more. The supply port 5 is adjusted by the relative position of the inner ring and the intermediate ring.

The present inventor has further developed a nozzle having a structure shown in FIG. 4 in order to solve this drawback. The nozzle in this figure was developed by colliding atomizing air and spreading air at an acute angle to obtain fine droplets.
With the nozzle having this structure, when the collision angle between the atomizing air and the spreading air is designed to be 25 degrees, fine particles of 10 μm or less can be obtained. However, in order to realize this, the tips of the two rings 6 forming the supply port 5 have an extremely sharp angle, which makes manufacture extremely difficult.

In order to obtain fine particles, the inventor of the present invention jets a liquid in a thin pointed shape like a double tube nozzle, or in a thin film shape to make fine particles with air. I thought that was an essential configuration requirement. Certainly, this structure allows the liquid to be atomized into fine droplets. However, in order to realize this structure, it is necessary to make the supply port for injecting the liquid extremely thin, or to make the slit remarkably narrow, so that there is a drawback that it is easily clogged and the ejection capability per unit time becomes small.

The method and nozzle for injecting liquid into fine particles of the present invention have succeeded in injecting liquid into fine particles by a new method different from the conventional principle. In the method of ejecting the liquid onto the fine particles of the present invention, the liquid is supplied from the supply port 5 to the inclined surface 7 as shown in FIG. The liquid supplied to the inclined surface 7 is thinly stretched by the air flow that causes high-speed flow along the inclined surface 7 to form a thin film flow 8. The thin film flow 8 is accelerated by the air flow and jetted into the gas from the tip of the inclined surface 7 to form droplets 9 of fine particles.

Further, in the method for spraying fine particles with a liquid according to claim 2 of the present invention, as shown in FIG. 6 showing a preferred embodiment, two methods are provided on both sides with a sharp edge 7A as a boundary. Two different liquids are supplied in the middle of the inclined surface 7, and the liquid supplied to the inclined surface 7 is
Thin film stream 8 is drawn by an air stream flowing at a high speed along the direction of the thin film stream 8 and the thin film stream 8 is jetted into the gas from the edge of the tip of the inclined surface 7 to form fine particles formed by mixing two different liquids. There is.

Further, the nozzle for ejecting the liquid to the fine particles according to the third aspect of the present invention has the following constitution. (A) The nozzle is a supply port 5 that ejects the liquid in a ring shape.
An inclined surface 7 for flowing the liquid ejected from the supply port 5, and an air port 10 for injecting pressurized air to the inclined surface 7.
With. (B) The supply port 5 is formed in a slit shape having a predetermined width. (C) The supply port 5 is formed in a ring shape. (D) The supply port 5 is opened in the middle of the inclined surface 7. (E) The angle α of the supply port 5 with respect to the inclined surface 7 is designed to be obtuse. (F) The inclined surface 7 is a smooth surface in the flow direction of the liquid. (G) The air port 10 is opened toward the supply port 5 opened in the middle of the inclined surface 7.

Furthermore, a nozzle for injecting a liquid to fine particles according to a fourth aspect of the present invention has the following configuration in addition to the configuration of the third aspect. (A) A sharp edge 7A is provided at the tip of the inclined surface 7. (B) The air ports 10 are opened on both sides of the edge 7A, and the compressed air is jetted on both sides of the edge 7A.

Furthermore, in the nozzle described in claim 5 of the present invention, in addition to the nozzle described in claim 3, a breathable member 18 is provided in a portion forming the air port 10.
The air-permeable member 18 has air-permeability that allows the air press-fitted into the air port 10 to penetrate therethrough and be ejected from the surface, and prevents the mist sprayed from the surface from being attached by the air ejected from the surface. . This breathable member 18 is provided with the air port 10
It has air permeability that allows the air that is press-fitted into it to be ejected from the surface, and prevents the mist that is sprayed from the surface from being attached by the air that is ejected from the surface.

Furthermore, in the nozzle described in claim 6 of the present invention, in addition to the nozzle described in claim 3, a helical rib 22 is arranged in the air passage 1. The helical rib 22 spirally rotates the air jetted from the air port 10 and jets it uniformly.

Furthermore, in addition to the nozzle described in claim 3, the nozzle described in claim 7 of the present invention has a liquid passage 2.
1, a helical rib 22 for spirally rotating the liquid flowing in the axial direction is arranged, and the liquid jetted from the supply port 5 is rotated by the helical rib 22 while the inclined surface 7 is rotated.
Is injected into

Further, in addition to the nozzle according to claim 4, the nozzle according to claim 8 of the present invention allows air flowing in the axial direction to the air passage 1 communicating with the air ports 10 opened on both sides of the edge 7A. Helical ribs 22 that rotate spirally are provided. The helical ribs 22 are provided so that the air jetted from the air ports 10 on both sides of the edge 7A rotate in mutually opposite directions.

Furthermore, in addition to the nozzle according to claim 3, the nozzle according to claim 9 of the present invention is such that air is provided on the tip surface of the nozzle inside the supply port 5 so that mist does not adhere to the tip of the nozzle. A peeling recess 19 is provided. The air peeling concave portion 19 is connected to the air passage 1 through the through hole 20.
The through hole 20 is opened in a direction in which the jetted air is rotated in the air separation recess 19, that is, in a tangential direction with respect to the radial direction. The surface of the air peeling concave portion 19 is a smooth surface, and is smoothly curved from the through hole 20 toward the air port 10. The air jetted from the through hole 20 flows along the front surface of the nozzle while rotating in the air separation concave portion 19,
The flowing air layer is configured to prevent the adhesion of fine particles.

[0023]

In the present invention, the liquid is atomized and ejected in a unique state. That is, as shown in FIG. 5, the method of injecting the liquid onto the fine particles of the present invention thinly stretches the liquid delivered to the inclined surface 7 with the air flow flowing at a high speed along the inclined surface 7 to form the thin film flow 8. To do. The thin film flow 8 flowing along the inclined surface 7 is too thin to leave the inclined surface 7 and cannot be kept in a film state, and is broken into small particles 9 by surface tension to form fine particle droplets 9. In the present invention, the liquid is jetted into a thin film flow 8 in the form of fine particles by the air flow. Therefore, as in the past,
There is a feature that the liquid can be made into ultrafine particles without ejecting the liquid in a thin film state. This can effectively prevent clogging of the liquid supply port 5, and further simplifies the processing of the supply port 5.

Further, as shown in FIG. 5, when a sharp edge 7A is provided at the tip of the inclined surface 7 and the atomizing air and the spreading air collide with each other at this edge 7A, the air can violently vibrate. Air vibration has the effect of making the liquid even finer.

Further, in the nozzle of the present invention, a ring-shaped edge 7A is provided at the tip of the inclined surface 7 and the liquid is ejected from the edge 7A, so that liquid droplets can be ejected to the fine particles in a hollow cone state. Droplets ejected from the hollow cone are
Can be efficiently dried or vaporized.

Further, in the nozzle according to the fifth aspect of the present invention, the air port 10 is constituted by the breathable member 18. The breathable member 18 jets a part of the air jetted from the air port 10 from the surface to prevent mist from adhering to the surface.
When air is jetted from the air port 10 at high speed, the surrounding air is drawn into the jetted air. For example, when air is jetted at a high speed from the air port 10 of the nozzle shown in FIG. 9, the air near the tip surface of the center ring 16 and the tip surface of the outer ring 13 is drawn in, and the air pressure in this portion drops. However, an air flow toward this surface is generated. Riding on this air flow, the mist in a semi-dry state collides with and adheres to the surfaces of the center ring 16 and the outer ring 13. In order to prevent such adhesion, a part of the center ring 16 and the outer ring 13 forming the air port 10 is made a breathable member 18. The breathable member 18 effectively prevents mist from adhering to the surface after ejecting air from the surface.

According to the sixth aspect of the nozzle, the air is uniformly ejected from the air port 10. This is because the helical rib 22 provided in the air passage 1 spins the air flowing in the axial direction. The spun air is pressed against the tube wall by centrifugal force and spreads on the circumference. Then, it uniformly flows into the air port 10 of the ring-shaped slit and is jetted uniformly and stably.

The nozzle of claim 7 uniformly ejects the liquid from the supply port 5. This is because the helical rib 22 provided in the liquid passage 21 spins the liquid flowing in the axial direction. The spun liquid is pressed against the tube wall by centrifugal force and spreads on the circumference. Then, it uniformly flows into the supply port 5 of the ring-shaped slit and is jetted uniformly and stably.

Furthermore, the nozzle of claim 8 is an improvement of the nozzle of claim 4, in which the air flowing in the air passage 1 communicating with the air ports 10 opened on both sides of the edge 7A is spun by the air flowing in the axial direction. A helical rib 22 is provided for applying a force. The air jetted from the air ports 10 on both sides of the edge 7A have mutually opposite spins, and when the mist is formed at the tip of the edge 7A, the twisting action of both air is added, and the fine particle crushing effect is enhanced to make smaller fine particles. You can

The nozzle of claim 9 has a unique structure for preventing the mist from adhering to the front surface. This nozzle is provided with an air peeling concave portion 19 on the tip surface of the nozzle inside the supply port 5. The air peeling concave portion 19 is connected to the air passage 1 through the through hole 20. The through hole 20 is opened in the direction in which the air to be jetted is rotated by the air separation recess 19. The surface of the air peeling recess 19 is a smooth surface, and the through hole 2
It is smoothly curved from 0 to the air port 10. The air ejected from the through holes 20 flows along the front surface of the nozzle while rotating in the air separation recess 19 to form an air layer in which the air flows, and this air layer prevents the adhesion of fine particles.

[0031]

Embodiments of the present invention will be described below with reference to the drawings. However, the examples shown below exemplify a method and a nozzle for ejecting a liquid to fine particles for embodying the technical idea of the present invention, and the present invention provides a method and a nozzle for ejecting a liquid to fine particles. Do not specify to:

Further, in this specification, for easy understanding of the claims, the numbers corresponding to the members shown in the embodiments are referred to as "claims column", "action column", and "action column". It is added to the members shown in the section of "Means for Solving the Problems". However, the members shown in the claims are
It is by no means specific to the members of the examples.

The nozzle shown in FIG. 5 for injecting liquid into fine particles has a supply port 5 for injecting the liquid in a ring shape, an inclined surface 7 for flowing the liquid ejected from the supply port 5, and an inclined surface 7 And an air port 10 for injecting pressurized air.

The nozzle shown in this figure has an inner ring 11
And an intermediate ring 12 and an outer ring 13. A supply port 5 is provided between the inner ring 11 and the intermediate ring 12, an atomized air air passage 14 is provided at the center of the inner ring 11, and a spreading air supply passage 15 is provided between the intermediate ring 12 and the outer ring 13. ing.

The inner ring 11 has a cylindrical outer shape, and the intermediate ring 12 has a cylindrical inner shape. A slit-shaped supply port 5 having a predetermined width is provided between the inner ring 11 and the intermediate ring 12. There is. The supply port 5 is formed in a ring shape, and the slit width is designed so that the liquid is not clogged.
The nozzle of the present invention does not need to send the liquid into a thin film from the supply port 5. This is because the liquid is thinly stretched on the inclined surface 7 and ejected as fine particles. Therefore, the slit width of the supply port 5 is designed to be an optimum value in consideration of the flow rate of the liquid to be delivered, the length of the inclined surface 7, the flow rate of atomized air sprayed on the inclined surface 7, the inner diameter of the supply port 5, and the like. It For example, the slit width of the supply port 5 is 0.2 to 1.
5 mm, preferably 0.4-1 mm, optimally about 0.8
Designed to mm.

The diameter of the supply port 5 depends on the flow rate of the liquid to be jetted,
It is designed to be the optimum value in consideration of the slit width and other factors. The diameter of the supply port 5 is designed to be about 50 mmφ in a nozzle that injects a liquid of 1000 g / min. The supply port 5 is designed to have a large diameter when the flow rate is large, and is designed to be small when the flow rate is small.

The outer periphery of the inner ring 11 and the intermediate ring 1
The tip end surface of No. 2 is cut into a tapered shape, and the inclined surface 7
Has become. The inclined surfaces 7 of the inner ring 11 and the intermediate ring 12 are flush with each other so that the flowing air injected along the inclined surface 7 of the inner ring 11 does not become turbulent at the boundary between the inner ring 11 and the intermediate ring 12. Is formed in. That the inclined surfaces 7 of the inner ring 11 and the intermediate ring 12 are on the same plane means that there is no step on the inclined surfaces 7 of the inner ring 11 and the intermediate ring 12, and the inclined surface 7 of the inner ring 11 to the inclined surface 7 of the intermediate ring 12 is not formed. It means that the air flows linearly. As described above, in order to process the inclined surfaces 7 of the inner ring 11 and the intermediate ring 12 into the same plane as the tapered shape, the inner ring 11 and the intermediate ring 12 may be connected and tapered. Further, the inclined surface 7 is a smooth surface along the flowing direction of the liquid so that the liquid flowing along the inclined surface 7 does not become a turbulent flow. The inclined surface 7 of the nozzle shown in the figure has a conical shape and the entire surface is finished as a smooth surface.

By providing the inner ring 11 and the intermediate ring 12 with the inclined surface 7, the supply port 5 is opened in the middle of the inclined surface 7. The inclination angle α of the inclined surface 7 provided on the inner ring 11 and the intermediate ring 12 is, for example, 100 to 170 so that the angle of the supply port 5 with respect to the inclined surface 7 is an obtuse angle.
Degree, preferably 120 to 160 degrees, more preferably 1 degree
It is designed to be 30 to 160 degrees, optimally about 150 degrees. The larger the inclination angle α, the more stable the outflow of liquid. However, the optimum value of the inclination angle α changes depending on the slit width. The inclination angle α is preferably such that the opening width of the supply port 5 on the inclined surface 7 is 2 mm.
Designed not to exceed.

A center ring 16 is provided at the tip of the inner ring 11.
Is provided, and the air port 10 is opened between the center ring 16 and the inner ring 11. The center ring 16
Although not shown, it is fixed to the inner ring 11 and arranged at a predetermined position. The center ring 16 has a tapered outer peripheral surface along the inclined surface 7 of the inner ring 11. Air port 1 formed between the center ring 16 and the inner ring 11.
Reference numeral 0 is a slit shape, from which pressurized air is jetted in a laminar flow state to cause high-speed flow along the inclined surface 7.

The air passage 14 of the inner ring 11 is connected to a pressurized air source F. The air port 10 injects atomized air flowing along the inclined surface 7. The air source F is, for example, 3 to 20 kg / cm ² , preferably 4 to 15 kg / cm ² .
Cm ² , more preferably 4-10 kg / cm ² , and optimally about 6.5 kg / cm ² of air is supplied to the air inlet 10. Increasing the air pressure of atomized air will increase the slope 7
The velocity of the air flowing at high speed along the direction becomes faster, so that the liquid can be more effectively and thinly stretched to form the liquid into droplets 9 of small particles. However, if the air pressure is increased, a special compressor is required, and the energy consumption is also increased, so the optimum value is designed in consideration of the required particle diameter of the droplet and the energy consumption.

Further, in the nozzle shown in FIG. 5, in addition to atomizing air, spreading air is jetted to the outer circumference of the inclined surface 7. However, it is not always necessary to inject the spreading air. This is because the liquid can be sprayed as fine particle droplets by atomizing air without spraying the spreading air. The nozzle for injecting the atomizing air and the spreading air has a feature that the atomizing air and the spreading air are made to collide with each other at the edge 7A of the inclined surface 7 to make the droplet 9 into a liquid of smaller fine particles. In addition, the angle of the hollow cone can be adjusted with spreading air. Further, depending on the nature of the liquid, the separation at the edge 7A may be poor, and liquid backflow may occur on the spreading air side.
You can prevent this with spreading air.

The spreading air is the intermediate ring 1
2 is sprayed from a spreading air spray port 17 provided between the outer ring 13 and the outer ring 13. Spreading air is low pressure air compared to atomized air. For example, when the atomizing air is about 6.5 kg / cm ² , the spreading air can be about 1 kg / cm ² . Unlike the atomized air, the spreading air does not need to be forced to thinly stretch the liquid, so that the spreading air can be set, for example, in the range of 0.5 to ³ kg / cm ² .

In the nozzle for ejecting both atomizing air and spreading air, the tip of the inclined surface 7 has a sharp edge 7A. The intermediate ring 12 is provided with an inclined surface 7 on the tip end surface, and the outer periphery of the tip end is processed into a cylindrical shape to form the inclined surface 7
Is provided with an edge 7A at its tip. The intermediate ring 12 having this shape can form a sharp edge 7A of (180 degrees-inclination angle α) at the tip of the inclined surface 7. Although not shown, the nozzle may be formed by tapering the outer periphery of the intermediate ring 12 to adjust the angle of the edge 7A.

The nozzle shown in FIG. 5 jets a liquid into a fine particle liquid in the following state. Atomized air that has been pressurized is supplied to the air passage 14 provided in the center of the inner ring 11, and spreading air is supplied to the spreading air injection port 17 between the intermediate ring 12 and the outer ring 13 so that it is supplied from the supply port 5. The liquid is sent to the inclined surface 7. The liquid supplied to the inclined surface 7 is thinly stretched by atomized air flowing at high speed along the inclined surface 7 to form a thin film flow 8. For example, if the atomized air is caused to flow along the inclined surface 7 at a flow rate of Mach 1.5 and the liquid is sent out to the supply port 5 and the flow rate at the tip of the thin film flow 8 is set to 1/20 of the atomized air, then 25 It becomes 0.5 m / s. If the diameter of the edge 7A provided at the tip of the inclined surface 7 is 50 mm, the liquid is supplied at 1 liter / min, and the film pressure of the thin film flow 8 becomes 4 μm.

The 4 μm thin film flow 8 becomes too thin to be in a film state after passing the edge 7 A of the inclined surface 7, and is broken into small particles 9 by surface tension.

The atomized air and the spreading air collide with the droplet 9 of the fine particles at the edge 7 A and rub and vibrate to make the droplet 9 into smaller particles.

The droplets 9 of fine particles are radially conveyed by atomizing air and spreading air.
This state is called a hollow cone. The cone angle of the hollow cone is determined by the angle of the inclined surface 7, but it can also be adjusted by the injection pressure of atomizing air and spreading air.

The droplet 9 ejected in the state of the hollow cone is
It is dried to form fine powder of fine particles or vaporized in the air. Whether the droplet is made into a fine powder or vaporized is specified by the type of liquid to be ejected. For example, when a chemical liquid that becomes a solid when dried into a liquid is used, it becomes a fine powder. The atomized liquid is vaporized by using a liquid that becomes a gas when vaporized like water.

FIG. 6 shows a nozzle for mixing the liquid A and the liquid B to form fine powder of fine particles. The nozzle shown in FIG.
The intermediate ring 12 of the nozzle shown in FIG.
A and the outer intermediate ring 12B have a double tube structure. The liquid B supply port 5 is provided between the inner intermediate ring 12A and the outer intermediate ring 12B. Ring-shaped inner intermediate ring 1
2A is provided with a tapered inclined surface 7 on the inner side surface and the outer side surface, and the tip thereof is a sharp edge 7A. The tip surface of the outer intermediate ring 12B is also processed into a tapered shape to form the inclined surface 7. The inclined surface 7 of the outer middle ring 12B is connected to the same plane as the inclined surface 7 of the inner middle ring 12A.

The nozzle shown in FIG. 6 has an inner intermediate ring 12
The inner side surface and the outer side surface of A have inclined surfaces 7, and the inclined surface 7 provided on the inner side is provided with the supply port 5 for liquid A and the outer inclined surface 7 is provided with the supply port 5 for liquid B. Both A liquid and B liquid can be thinly spread on the inclined surface 7 with atomized air.
Air port 10 of inner ring 11 and outer intermediate ring 12B
In addition, high-pressure atomized air is jetted from both of the spreading air jet port 17 between the outer ring 13 and the outer ring 13.

The nozzle having this structure can inject the A liquid and the B liquid, which are not mixed in the liquid state, to uniformly disperse the A liquid and the B liquid. For example, liquid A can be sprayed with a water-insoluble methylene chloride-based liquid, and liquid B can be sprayed with a water-based binding liquid. However, the nozzle of this structure can also branch the same liquid and eject it from two supply ports. If the same liquid is branched into two and jetted, the flow rate of the liquid jetted from one supply port can be halved. Therefore, the liquid on the inclined surface can be made into fine particles as a thin film flow.

From the nozzle of this figure, A
When the liquid and the liquid B are simultaneously ejected, the result is as shown in FIG. Solution A does not mix with solution B, which is water-based. Therefore, both liquid droplets 9 of liquid A and liquid B are formed at the same time. When the droplet 9 is sprayed in hot air at 60 ° C., the methylene chloride of the liquid A is evaporated and the droplet 9 of the liquid A is dried to be a fine powder. Even if the droplet 9 of the A liquid is in a dry state, the droplet 9 of the B liquid is not yet dried. The liquid B is in the state of droplets 9 having a high concentration due to vaporization of part of the water. Then, the fine particles of liquid A and liquid B are uniformly dispersed in each other. After that, the droplets 9 of the liquid B adhere to the fine powder of the liquid A, some cover the surface of the fine powder of the liquid A, and some bond the fine powder of the liquid A. The fine powders of solution A coated on solution B are combined with each other to grow into larger particles and granulated. When used in this way, the nozzle shown in FIG. 6 can simultaneously perform spray drying of liquid and granulation. Moreover, there is a feature that the liquid A and the liquid B can be uniformly dispersed and granulated.

Further, the chemical A and the chemical B are as follows.
Solid dispersions can be made. The solid dispersion is a substance in which the components constituting the primary particles are two or more kinds and the molecules of the components are mixed to form a solid.

The usual method for preparing a solid dispersion in which the drug A and the drug B are mixed is obtained by spray drying a solution prepared by dissolving the drug A and the drug B in a mixed solution of the solvent C and the solvent D. However, the chemical A has a property of slowly decomposing with the solvent D, and the chemical B has the property of degrading the solvent C and the solvent D.
It cannot be dissolved unless it is a mixed solution of. Therefore, in order to eliminate the decomposition of the chemical A, the chemical A is dissolved in the solvent C to form the liquid A, the chemical B is dissolved in the mixed liquid of the solvent C and the solvent D to form the liquid B, and the liquid A and the liquid B are discharged by the nozzle described above. To spray. Edge 7A
The liquids A and B supplied to both sides of are mixed at the edge 7A and fly as a mist, and this mist is
When sprayed in hot air, it is heated and causes boiling evaporation.
At this time, the two liquids are completely mixed by boiling vibration and dried to obtain an ultrafine solid dispersion. In this case, the chemical A encounters the solvent D only for a moment in the mist state, so that decomposition does not occur and a good quality solid dispersion of the chemical A and the chemical B is obtained.

The nozzle shown in FIG. 6 has an inner intermediate ring 12
Inclined surfaces 7 are provided on both inner and outer sides of A, and two different liquids are supplied to the inner and outer inclined surfaces 7. The nozzle shown in FIG. 8 is provided with a plurality of supply ports 5 in the middle of the inclined surface 7. The nozzle having this structure can supply several kinds of different liquids from the plurality of supply ports 5 and spray them at the same time.
By combining the liquids supplied to the supply port 5, it is possible to produce multifunctional composite particles having new properties. For example, several kinds of liquids which have been heated and melted in advance are co-sprayed in cold air, or several kinds of solutions prepared by using some kinds of soluble solvents or insoluble solvents are simultaneously sprayed in hot air. Thus, the multifunctional composite particles suitable for the purpose can be produced by selecting the solute and the solvent and setting the temperature of the dry air.

Further, FIGS. 9 and 10 show a nozzle capable of forming finer particles. The nozzles shown in these figures
Similar to the nozzle shown in FIG. 6, the intermediate ring 12 has a double tube structure including an inner intermediate ring 12A and an outer intermediate ring 12B. The liquid B supply port 5 is provided between the inner intermediate ring 12A and the outer intermediate ring 12B. The ring-shaped inner intermediate ring 12A is provided with tapered inclined surfaces 7 on both the inner side surface and the outer side surface, and its tip has a sharp edge 7A.
And The tip surface of the outer intermediate ring 12B is also processed into a tapered shape to form the inclined surface 7.

An enlarged view of the inclined surface is shown in FIG. As shown in this figure, the inclined surface 7 of the inner intermediate ring 12A has a slight step in the vicinity of the supply port 5 with respect to the extension line of the inclined surface 7 of the outer intermediate ring 12B and the inner ring 11 located on both sides thereof. It is provided and designed low. The nozzle having the inclined surface of this shape is characterized in that the high-speed airflow flowing along the inclined surface 7 smoothly discharges the liquid from the supply port 5 as shown by the arrow. This is because the inclined surface 7 of the inner intermediate ring 12A does not protrude from the inclined surfaces 7 on both sides. Although not shown, the inclined surface 7 of the inner intermediate ring 12A
But when protruding from the extension lines of the inclined surfaces 7 located on both sides,
Air collides with the protrusions and the liquid cannot be discharged smoothly.

Further, the nozzle shown in the enlarged view of FIG.
The inclined surface 7 of the inner intermediate ring 12A is curved, and the tip portion is formed so as to project from the extension line of the adjacent inclined surface 7. Inner intermediate ring 12A having this shape
In the inclined surface 7, the air flow that flows at high speed along the inclined surface 7 in the direction of the arrow is strongly pressed against the inclined surface 7 at the tip portion, and the thin film flow of the liquid flowing in the inclined surface 7 can be extended more thinly. . Therefore, the nozzle having this structure has a feature that the liquid can be ejected as extremely fine particles, for example, as fine particles of 1 to 5 μm.

The nozzle shown in this figure has an outer intermediate ring 1
If the angles of 2B, the inner intermediate ring 12A, and the tip of the inner ring 11 are designed as shown in the figure, the liquid can be jetted with a hollow cone.

In the nozzle shown in FIGS. 5, 6 and 9, the spreading air injection port 17 and the tip portions of the center ring 16 and the outer ring 13 forming the air port 10 are made of a breathable member 18. . The breathable member 18 has a breathability that allows the air press-fitted into the air port 10 to penetrate and be ejected from the surface. The breathable member 18 is, for example, a sintered metal made of stainless steel having an average particle diameter of about 1 μm. The breathable member 18 has an effect of injecting part of the air ejected from the air port 10 from the surface to prevent mist from adhering to the surfaces of the tip portions of the center ring 16 and the outer ring 13.

Further, FIG. 12 shows a nozzle capable of jetting fine particles to both the hollow cone and the full cone. FIG. 13 shows an enlarged view of the main part of the tip portion of the nozzle in this figure. This nozzle is similar to the nozzle shown in FIG.
Has a double tube structure of an inner intermediate ring 12A and an outer intermediate ring 12B. The liquid B supply port 5 is provided between the inner intermediate ring 12A and the outer intermediate ring 12B. The ring-shaped inner intermediate ring 12A is provided with tapered inclined surfaces 7 on both the inner side surface and the outer side surface, and the tip thereof is a sharp edge 7A. The tip surface of the outer intermediate ring 12B is a straight inclined surface 7.

An enlarged view of the inclined surface 7 provided on the inner intermediate ring 12A is shown in FIG. The nozzle shown in this figure is also shown in FIG.
Similar to the nozzle shown in FIG. 6, the inclined surface 7 of the inner intermediate ring 12A is slightly stepped in the vicinity of the supply port 5 with respect to the extension line of the inclined surfaces 7 of the outer intermediate ring 12B and the inner ring 11 located on both sides thereof. Is designed to be low. Also in the nozzle having the inclined surface 7 of this shape, the high-speed airflow flowing along the inclined surface 7 as shown by the arrow smoothly discharges the liquid from the supply port 5.

Further, in the nozzle shown in FIG. 14, the inclination angle of the inclined surface 7 of the inner intermediate ring 12A is changed on the way, and the tip portion is formed so as to protrude from the extension line of the adjacent inclined surface 7. There is. Inner intermediate ring 1 of this shape
In the inclined surface 7 of 2A, the air flow that flows at high speed along the inclined surface 7 in the direction of the arrow is strongly pressed against the inclined surface 7 at the tip portion, and the thin film flow of the liquid flowing in the inclined surface 7 can be thinly extended. . Therefore, the nozzle having this structure has a feature that the liquid can be ejected as finer particles.

Further, the nozzle shown in this figure has an outer ring 13, an outer intermediate ring 12B, and an inner intermediate ring 1
By designing the angle of 2A and the tip of the inner ring 11 as shown, the liquid can be jetted in both the hollow cone and the full cone. In order to eject the liquid to the hollow cone, the injection pressure of atomized air injected from the air port 10 between the center ring 16 and the inner ring 11 is injected from the air port 10 between the outer intermediate ring 12B and the outer ring 13. Make it stronger than the atomizing air injection pressure. On the contrary, the injection pressure of the atomized air injected from the air port 10 between the outer intermediate ring 12B and the outer ring 13 is changed to the center ring 16
When the injection pressure of atomized air ejected from the air port 10 between the inner ring 11 and the inner ring 11 is made stronger, the liquid can be ejected in a full cone state.

Similarly to the nozzle shown in FIG. 9, in the nozzle shown in FIG. 12, the tip portions of the center ring 16 and the outer ring 13 forming the air port 10 are used as the air-permeable member 18, and the center ring 16 and the outer ring 13 are connected. Prevents mist from adhering to the surface.

Further, the nozzle shown in FIG. 15 has a unique structure for preventing mist from adhering without using a breathable member. In the nozzle of this figure, an air peeling recess 19 is provided on the tip surface of the center ring 16, and an air peeling recess 19 is provided on the tip surface of the nozzle inside the supply port 5. The air peeling recess 19 has a through hole 20 formed in the center ring 16.
Is connected to the air passage 1 between the inner ring 11 and the center ring 16. As shown in FIG. 16, the through hole 20 is opened so as to be inclined in the tangential direction from the direction in which the air to be jetted is rotated in the air separation recess 19, that is, the radial direction. The surface of the air separation recess 19 is a smooth surface that can flow in a laminar state without disturbing the air. Further, the outer peripheral portion of the air peeling concave portion 19 has a streamline shape similar to that of an aircraft wing and is smoothly curved toward the air port 10.

The nozzle of this structure is designed to supply pressurized air to
When jetted from the through hole 20 to the air separation recess 19 in a tangential direction, the air collides with the inner surface of the tapered air separation recess 19 and spreads thinly to form a swirling flow. At this time, the taper angle (θ) of the air separation concave portion 19 can change the ratio of the airflow toward the outlet direction of the air separation concave portion 19 (upward in the drawing). Assuming that the taper angle (θ) is 15 degrees as shown in the figure, the swirling airflow toward the outlet direction is 70%, and the remaining 30% is the swirling airflow toward the bottom of the air separation recess 19 and reaches the bottom. After that, reduce the wind speed and head toward the exit. Then, the air is entrained in the above-mentioned 70% high-speed swirling airflow and discharged from the air separation recess 19.

The high-speed swirling airflow of the air flowing along the inner surface of the air separation recess 19 climbs the tapered surface and the slope of the streamlined portion of the airfoil, and reaches the tip to flow along the airfoil surface. And is drawn into the atomized air injected from the air passage 1 provided between the inner ring 11 and the center ring 16. The streamlined airfoil is smoothly curved towards the air port 10 so that air flows along the surface, creating a flowing air layer in front of the central ring 16.

Since the entire front surface of the center ring 16 is covered with this flowing air layer, mist sprayed from the supply port 5 does not adhere. The through hole 20 is an air peeling concave portion 1.
It is preferable that the number is about 6 so that the air can be uniformly ejected from 9. However, the number of through holes can be increased. Furthermore, if the shape of the through holes is made slit-like and the lateral width is wide, air can be blown out uniformly from the air separation recesses with less than five through holes.

In this structure nozzle, since the front surface of the nozzle is covered with the air layer, the flying mist does not adhere to the surface and is blown away by the streamline airflow which is a flowing air layer. Further, the nozzle having this structure can obtain the same effect with a smaller amount of air than the method of preventing the powder adhesion by the air laying by the breathable member 18.

Furthermore, the nozzle shown in FIG.
Nozzles for uniformly ejecting air and liquid from 0 and the supply port 5 are shown. In the nozzle of this figure, helical ribs 22 are arranged in the air passage 1 and the liquid passage 21. Air path 1 and liquid path 21
The ribs are provided between the rings for centering when assembling each ring, that is, for accurately aligning the centers of all the rings. By contacting the tips of the ribs, the rings are centered and accurately assembled.

The ribs are evenly provided between the rings, as shown in FIG. The nozzle in this figure has four ribs, but at least three ribs are provided because the ribs are for equalizing the entire circumference of the ring interval. As shown in this figure, when the ribs are straight ribs 23 extending in the fluid flow direction, the fluid goes straight and passes between the ribs. The fluid passing through the straight ribs 23 is coarse,
There is uneven density. The straight ribs 23 are coarse, and the spaces between the straight ribs 23 are dense.

In order to eliminate this phenomenon, as shown in FIG. 19, when the straight rib is changed to a helical rib 22 which is deformed into a spiral shape, the fluid passing between the helical ribs 22 is spun, and the fluid with the spin is It is pressed against the tube wall by centrifugal force and spreads on the circumference to become uniform. In FIG. 19, a helical rib 22 provided in the air passage 1
The inclination angle α of is preferably about 30 degrees. The inclination angle α is an angle with respect to the center line of the helical rib 22. Since air has a high flow velocity, the inclination angle α can be made small and spin can be sufficiently applied. When the inclination angle α is increased, spin is often applied, but air passage resistance increases. The inclination angle α of the helical rib 22 is, for example, 10 to 45 degrees, preferably 15 to 40, in consideration of air spin and passage resistance.
And more preferably 20 to 35 degrees.

In the nozzle shown in FIG. 17, helical ribs 22 are provided in the air passage 1 communicating with the air openings 10 formed on both sides of the edge 7A so that the air flowing in the axial direction is spun to rotate spirally. There is. Air ejected from the air ports 10 on both sides of the edge 7A is ejected toward the edge 7A while rotating in opposite directions. In the nozzle of this structure, the atomized air flowing on both sides of the edge 7A has mutually opposite spins, and when the mist is formed at the tip of the edge 7A, the twisting action of both air is added, and the mist crushing effect is enhanced, and smaller mist is produced. You can make it.

However, in the nozzle of the present invention, the atomizing air flowing on both sides of the edge does not necessarily have to be reverse-spun, and the atomizing air on both sides of the edge can be spun in the same direction. Further, in a nozzle having a plurality of air openings, it is not necessary to spin the air ejected from all the air openings. Therefore, the helical rib can be provided only in a specific air passage.

Furthermore, the nozzle shown in FIG.
A helical rib 22 is also provided on the first unit. Since liquid has a lower flow velocity than air, the inclination angle α of the helical rib 22 is
Is about 60 degrees. The inclination angle α is, for example,
It can be in the range of 30 to 70 degrees, preferably 45 to 65 degrees. Inclination angle α of the helical rib 22 of the liquid passage 21
Also, like the helical rib 22 of the air passage 1, if it is increased, the spin of the liquid can be increased, but the flow resistance of the liquid is increased. Therefore, the inclination angle α of the helical rib 22
Is designed to be an optimum value in consideration of the flow resistance and spin of the liquid.

[0077]

EFFECTS OF THE INVENTION The method and nozzle for ejecting a liquid to fine particles of the present invention have the following excellent features. The liquid can be jetted into extremely small particles, and various liquids can be jetted continuously for a long time without clogging. That is, the present invention does not jet the liquid into the fine particles by jetting it from an extremely small hole or an extremely narrow slit, but by using an air flow that flows at high speed along the inclined surface, the liquid is thinly stretched along the inclined surface. This is because the liquid is sprayed as fine particles and the liquid constantly self-cleans the inclined surface. The present invention has the advantage that the liquid can be ejected as extremely small particles at the flow rate of the air flowing along the inclined surface because the liquid is drawn into a thin film flow to form fine particle droplets.

It is possible to increase the injection amount per unit time and to eject fine droplets. This is because the method and nozzle of the present invention for ejecting the liquid to the fine particles can supply the liquid from the ring-shaped slit to the inclined surface to form the fine particles. By the way, the nozzle prototyped by the present inventor succeeded in ejecting 1000 g of liquid per minute and ejecting droplets of fine particles having a particle diameter of 10 μm or less.

If desired, it is also possible to inject the liquid into the hollow cone. It has the feature that it can be sprayed with a liquid on a hollow cone to dry it efficiently or vaporize it. However, the method and nozzle of the present invention for ejecting liquid onto fine particles can also eject liquid onto a full cone. That is, it is possible to inject into both full-cone and hollow-cone states as best suited for the application.

It is also possible to provide inclined surfaces on both sides of the edge and supply different liquids to the two inclined surfaces to form fine particles of the solid dispersion. By forming the air port with a breathable member, mist can be effectively prevented from adhering. The breathable member communicated with the air port does not need to supply special air and can inject a part of the air ejected from the air port to effectively prevent the mist from adhering. If necessary, spray drying and granulation can be performed simultaneously.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a conventional nozzle that ejects liquid into fine particles.

FIG. 2 is a schematic cross-sectional view of a nozzle for ejecting a liquid of another example of the related art onto fine particles.

FIG. 3 is a cross-sectional view of a nozzle that has been previously developed by the present inventor for ejecting a liquid onto fine particles.

FIG. 4 is a cross-sectional view of a nozzle developed by the inventor following the nozzle of FIG.

FIG. 5 is a cross-sectional view of a nozzle for ejecting a liquid onto fine particles according to an embodiment of the present invention.

FIG. 6 is a cross-sectional view of a nozzle for ejecting a liquid onto fine particles according to another embodiment of the present invention.

FIG. 7 is a process diagram showing a state in which droplets ejected from the nozzle of FIG. 6 are dried and granulated.

FIG. 8 is a sectional view of a nozzle for ejecting a liquid onto fine particles according to another embodiment of the present invention.

FIG. 9 is a sectional view of a nozzle for ejecting a liquid onto fine particles according to another embodiment of the present invention.

10 is an enlarged cross-sectional view of a main part of the nozzle shown in FIG.

11 is an enlarged cross-sectional view showing a tip portion of an inner intermediate ring of the nozzle shown in FIG.

FIG. 12 is a cross-sectional view of a nozzle for ejecting liquid to fine particles according to another embodiment of the present invention.

13 is an enlarged cross-sectional view of a main part of the nozzle shown in FIG.

FIG. 14 is an enlarged cross-sectional view showing the tip of the inner intermediate ring of the nozzle shown in FIG.

FIG. 15 is a cross-sectional view of a nozzle for ejecting liquid to fine particles according to another embodiment of the present invention.

16 is a plan view of the air peeling recess shown in FIG.

FIG. 17 is a cross-sectional view of a nozzle for ejecting liquid to fine particles according to another embodiment of the present invention.

FIG. 18 is a front view and a plan view of a straight rib provided between conventional rings.

19 is a front view and a plan view of a helical rib provided between the rings shown in FIG.

[Explanation of symbols]

1 ... Air path 2 ... Primary mist 3 ... Secondary mist 4 ... Center hole 5 ... Supply port 6 ... Ring 7 ... Inclined surface 7A ... Edge 8 ... Thin film flow 9 ... Droplet 10 ... Air port 11 ... Inner ring 12 ... Intermediate Ring 12A ... Inner middle ring 12
B ... Outer intermediate ring 13 ... Outer ring 14 ... Atomized air air passage 15 ... Spreading air supply passage 16 ... Central ring 17 ... Spreading air injection port 18 ... Breathable member 19 ... Air peeling recess 20 ... Through hole 21 … Liquid path 22… Helical rib 23… Straight rib

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hiroyuki Mori 8-106 Kinisocho, Komatsushima City, Tokushima Prefecture Fujisaki Electric Co., Ltd.

Claims (9)

[Claims] 1. A liquid is supplied from a supply port (5) to an inclined surface (7), and the liquid supplied to the inclined surface (7) is thinly stretched by an air flow that causes high speed flow along the inclined surface (7). To form a thin film flow (8), and the thin film flow (8) is jetted into the gas from the tip of the inclined surface (7) to spray fine particles with a liquid. 2. Two kinds of different liquids are supplied in the middle of two inclined surfaces (7) provided on both sides of the sharp edge (7A) as a boundary, and the liquid supplied to the inclined surface (7) is supplied. , Inclined surface
A thin film flow (8) is formed by thinly stretching it with an air flow that flows along (7) at a high speed, and the thin film flow (8) is formed on the edge (7) of the inclined surface (7).
A method of spraying from A) into a gas and spraying a liquid, which is a fine particle formed by mixing two different liquids, onto the fine particle. 3. A nozzle for ejecting a liquid having all of the following configurations to fine particles. (A) The nozzle is a supply port that ejects the liquid in a ring shape.
(5), an inclined surface (7) for flowing the liquid ejected from the supply port (5), and an air port (10) for injecting pressurized air to the inclined surface (7). (B) The supply port (5) is formed in a slit shape having a predetermined width. (C) The supply port (5) is formed in a ring shape. (D) The supply port (5) is opened in the middle of the inclined surface (7). (E) The angle α of the supply port (5) with respect to the inclined surface (7) is designed to be obtuse. (F) The inclined surface (7) is a smooth surface in the flow direction of the liquid. (G) The air port (10) is open toward the supply port (5) opened in the middle of the inclined surface (7). 4. A nozzle for ejecting a liquid having all of the following configurations to fine particles. (A) The nozzle is a supply port that ejects the liquid in a ring shape.
(5), an inclined surface (7) for flowing the liquid ejected from the supply port (5), and an air port (10) for injecting pressurized air to the inclined surface (7). (B) The supply port (5) is formed in a slit shape having a predetermined width. (C) The supply port (5) is formed in a ring shape. (D) The supply port (5) is opened in the middle of the inclined surface (7). (E) The angle α of the supply port (5) with respect to the inclined surface (7) is designed to be obtuse. (F) The inclined surface (7) is a smooth surface in the flow direction of the liquid. (G) The air port (10) is open toward the supply port (5) opened in the middle of the inclined surface (7). (H) A sharp edge (7A) is provided at the tip of the inclined surface (7). (I) The air port (10) is opened on both sides of the edge (7A), and the pressurized air is jetted to both sides of the edge (7A). 5. A nozzle for ejecting a liquid having all of the following configurations to fine particles. (A) The nozzle is a supply port that ejects the liquid in a ring shape.
(5), an inclined surface (7) for flowing the liquid ejected from this supply port (5), an air port (10) for injecting pressurized air to this inclined surface (7), and this air port ( And a breathable member (18) which constitutes (10). (B) The supply port (5) is formed in a slit shape having a predetermined width. (C) The supply port (5) is formed in a ring shape. (D) The supply port (5) is opened in the middle of the inclined surface (7). (E) The angle α of the supply port (5) with respect to the inclined surface (7) is designed to be obtuse. (F) The inclined surface (7) is a smooth surface in the flow direction of the liquid. (G) The air port (10) is open toward the supply port (5) opened in the middle of the inclined surface (7). (H) The breathable member (18) has a breathability that allows the air press-fitted into the air port (10) to penetrate and be ejected from the surface. 6. A nozzle for ejecting a liquid having all of the following configurations to fine particles. (A) The nozzle is a supply port that ejects the liquid in a ring shape.
(5) and a cylindrical liquid passage (2
1), an inclined surface (7) for flowing the liquid ejected from the supply port (5), and an air port (1 for injecting pressurized air to the inclined surface (7)
0) and an air passage (1) for supplying air to the air port (10). (B) The supply port (5) is formed in a slit shape having a predetermined width. (C) The supply port (5) is formed in a ring shape. (D) The supply port (5) is opened in the middle of the inclined surface (7). (E) The angle α of the supply port (5) with respect to the inclined surface (7) is designed to be obtuse. (F) The inclined surface (7) is a smooth surface in the flow direction of the liquid. (G) The air port (10) is open toward the supply port (5) opened in the middle of the inclined surface (7). (H) The air passage (1) is provided with a helical rib (22) that spirally rotates the air flowing in the axial direction, and the air injected from the air port (10) is inclined while rotating spirally. It is configured to be jetted along the surface (7). 7. A nozzle for ejecting a liquid having all of the following configurations to fine particles. (A) The nozzle is a supply port that ejects the liquid in a ring shape.
(5) and a cylindrical liquid passage (2
1), an inclined surface (7) for flowing the liquid ejected from the supply port (5), and an air port (1 for injecting pressurized air to the inclined surface (7)
0) and an air passage (1) for supplying air to the air port (10). (B) The supply port (5) is formed in a slit shape having a predetermined width. (C) The supply port (5) is formed in a ring shape. (D) The supply port (5) is opened in the middle of the inclined surface (7). (E) The angle α of the supply port (5) with respect to the inclined surface (7) is designed to be obtuse. (F) The inclined surface (7) is a smooth surface in the flow direction of the liquid. (G) The air port (10) is open toward the supply port (5) opened in the middle of the inclined surface (7). (H) The liquid passage (21) is provided with a helical rib (22) for spirally rotating the liquid flowing in the axial direction, and the liquid ejected from the supply port (5) is rotated by the helical rib (22). Meanwhile, it is configured to be injected on the inclined surface (7). 8. A nozzle for ejecting a liquid having all of the following configurations to fine particles. (A) The nozzle is a supply port that ejects the liquid in a ring shape.
(5), an inclined surface (7) for flowing the liquid ejected from this supply port (5), an air port (10) for injecting pressurized air to this inclined surface (7), and this air port ( Air path for supplying air to (10) (1)
With. (B) The supply port (5) is formed in a slit shape having a predetermined width. (C) The supply port (5) is formed in a ring shape. (D) The supply port (5) is opened in the middle of the inclined surface (7). (E) The angle α of the supply port (5) with respect to the inclined surface (7) is designed to be obtuse. (F) The inclined surface (7) is a smooth surface in the flow direction of the liquid. (G) The air port (10) is open toward the supply port (5) opened in the middle of the inclined surface (7). (H) A sharp edge (7A) is provided at the tip of the inclined surface (7). (I) The air port (10) is opened on both sides of the edge (7A), and the pressurized air is jetted to both sides of the edge (7A). (J) Helical ribs (22) for spirally rotating the air flowing in the axial direction are arranged in the air passage (1) communicating with the air ports (10) opened on both sides of the edge (7A), The air jetted from the air ports (10) on both sides of the edge (7A) is configured to be jetted toward the edge (7A) while rotating in opposite directions. 9. A nozzle for ejecting a liquid having all of the following constitutions to fine particles. (A) The nozzle is a supply port that ejects the liquid in a ring shape.
(5), an inclined surface (7) for flowing the liquid ejected from the supply port (5), and an air port (10) for injecting pressurized air to the inclined surface (7). (B) The supply port (5) is formed in a slit shape having a predetermined width. (C) The supply port (5) is formed in a ring shape. (D) The supply port (5) is opened in the middle of the inclined surface (7). (E) The angle α of the supply port (5) with respect to the inclined surface (7) is designed to be obtuse. (F) The inclined surface (7) is a smooth surface in the flow direction of the liquid. (G) The air port (10) is open toward the supply port (5) opened in the middle of the inclined surface (7). (H) An air peeling recess (19) is provided on the tip surface of the nozzle inside the supply port (5). (I) The air peeling recess (19) is connected to the air passage (1) through the through hole (20). (J) The through hole (20) is opened in the direction in which the jetted air is rotated in the air separation recess (19). (K) The surface of the air separation recess (19) is a smooth surface, and the air port (1
The air is smoothly curved toward (0), the air injected from the through hole (20) flows along the front surface of the nozzle while rotating in the air separation recess (19), and the flowing air layer is injected. It is configured to prevent the adhered mist.