JPH0459023B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is used in various industries to atomize a mixed liquid of two or more types, and to be used in granulation, combustion, painting, spraying of glaze in the ceramics industry, etc. This is a nozzle used for work, and is related to the improvement of Japanese Patent Application No. 60-184628 (two-fluid nozzle), especially in the previous application, there is only one liquid inlet, so a mixed liquid must be prepared in advance. However, the present invention relates to a two-fluid nozzle in which each liquid can be fed individually through a plurality of liquid inlet ports.

[Prior art and problems to be solved by the invention]

In conventional nozzles of this type, a mixture of two or more types of liquids is prepared in advance and fed into the nozzle as a single mixed liquid to be atomized. For this reason, depending on the mixed liquid, precipitation may occur and it is difficult to uniformly atomize the liquid, and in cases such as water and oil, mixing itself is impossible, and when multiple liquids are mixed,
There have been problems such as chemical changes occurring over time, and when miniaturizing the nozzle, it is almost impossible to atomize the particles using conventional techniques.

The present invention was made in view of the problems of the prior art, and its purpose is to feed a plurality of liquids through a plurality of liquid inlet ports provided in one nozzle, and perform primary mixing instantly inside the nozzle. The object of the present invention is to provide a two-fluid nozzle that can atomize particles by external mixing again and achieve atomization of liquids that could not be mixed in advance or liquids with strong sedimentation properties. Firstly, in the case of liquids that produce precipitates when mixed, conventional nozzles are clogged by the precipitates, but this is solved by the present invention.Secondly, by mixing, the nozzles harden over time. The solution is to instantly mix the liquid in the nozzle and atomize it. Thirdly, when mixing oil and water for combustion, the liquid is fed from separate liquid inlet ports of one nozzle and mixed in the nozzle. The goal is to atomize it and make it possible to burn it.

[Means to solve the problem]

In order to achieve the above object, the two-fluid nozzle according to the present invention includes a liquid injection port through which the liquid to be atomized is ejected together with gas, a swirl chamber formed at a position surrounding the liquid injection port, and a swirl-shaped a swirl guide hole extending into the swirl chamber and introducing a high-speed airflow into the swirl chamber to generate a high-speed swirl flow in the swirl chamber; and a swirl guide hole formed at a position facing the liquid injection port of the swirl chamber and facing the liquid injection port A two-fluid nozzle for generating ultrafine particles by means of a high-speed vortex gas, comprising an annular injection port that injects and forms a tapered conical high-speed vortex flow, the nozzle tip having an opening for the liquid injection port and the gas injection port. is formed into a pointed shape with a liquid injection port as a protruding end, and an air flow passage is provided extending from a single compressed gas inlet to the swirl guide hole and the liquid injection port, respectively, and an air flow passage extending to the liquid injection port. A plurality of liquid feeding ports are opened in the liquid feeding port, and the liquid introduced from each liquid feeding port is crushed and mixed by an air flow and then guided to a liquid injection port.

[Effect]

The liquid guided through each of the plurality of liquid inlets is transferred to the first one by the airflow led from the compressed gas inlet
The liquid is crushed and mixed in the air passage and is ejected from the liquid injection port as a gas-liquid mixture. Also, from the annular gas injection port around the liquid injection port, the airflow guided from the second airflow passage is sent to the vortex chamber via the spiral swirl guide hole and becomes a tapered conical high-speed vortex. Injected. The gas-liquid mixture ejected from the liquid injection port comes into contact with this high-speed vortex and is crushed into atomized fine particles.

Further, the nozzle tip, in which the liquid injection port and the annular gas injection port surrounding the liquid injection port are formed, has a pointed shape with the liquid injection port as a protruding end, so that negative pressure is less likely to be generated around the liquid injection port.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

Figures 1 to 5 show an embodiment of the present invention. Figure 1 is an external plan view of a two-fluid nozzle which is an embodiment of the present invention, Figure 2 is a front view, and Figure 3 is a front view. Second
Figure A-A' sectional view, Figure 4 is Figure 2 B-B' sectional view,
FIG. 5 is a sectional view taken along the line C-C' in FIG.

In these figures, reference numeral 4 denotes a nozzle body, and within this nozzle body 4, there is an internal mixing chamber 11 that opens at the front and forms a liquid injection port that extends back and forth, and a compressed gas inlet 8 that opens at the rear and has a small diameter. A first airflow passage is formed which communicates with the compressed gas inlet 8 and the liquid injection port through the primary gas injection port 9 . A pair of liquid inlet ports 10, 10 are arranged in the vicinity of the constricted primary gas outlet 9 of the internal mixing chamber 11 so as to face each other. Further, at a position sandwiching the internal mixing chamber 11, a secondary gas passage 12, which is a second airflow passage communicating with the compressed gas inlet 8, extends along the internal mixing chamber 11. An internal mixing chamber 11 is located in front of the nozzle body 4.
A cylindrical nozzle tip 5 that forms a front region of the nozzle and a liquid injection port is integrally formed. On the outside of the nozzle tip 5, there are a cavity 13 communicating with the secondary gas passage 12, a spiral secondary gas ejection groove 14 serving as a swirl guide hole, and a swirl chamber 15.
is formed, and the swirl chamber 15 opens around the front end of the nozzle tip 5 as an annular gap 16. and an annular gap 1 around the liquid injection port at the front end of the nozzle tip.
Reference numeral 6 constitutes a gas injection port that injects and forms a tapered conical high-speed vortex in front of the liquid injection port. In this way, a swirl guide hole (secondary gas inlet) is formed from the compressed gas inlet 8 to the outside of the first air passage, which consists of the primary gas outlet 9 and the internal mixing chamber 11 and extends from the compressed gas inlet 8 to the liquid injection outlet. A secondary gas passage 12, which is a second air passage, is formed extending to the ejection groove 14).

In the nozzle of this embodiment, a core 2 (see FIG. 7) in which a secondary gas ejection groove 14 is formed is assembled to the nozzle tip 5 of the nozzle body 4 via a compression coil spring 6, and the core 2 is further assembled into the nozzle tip 5 of the nozzle body 4. A spout plate cap 1 is disposed so as to cover the nozzle, and a tightening ring 3 is screwed onto the threaded portion 7 of the nozzle body from the outer periphery of the spout plate cap 1 to form a cavity 13 and a secondary gas around the nozzle tip 5, which is a liquid injection port. Ejection groove (swivel guide hole) 14,
Swirl chamber 15 and annular gap (annular gas injection port) 1
6 is integrated into the structure.

The operation of the nozzle shown in this embodiment will be explained below.
In FIGS. 3 and 4, high-pressure gas is sent from the compressed body inlet 8 provided at the rear of the nozzle body 4 and is injected through the small-diameter primary gas outlet 9 and enters the internal mixing chamber 11. . At this time, negative pressure is generated near the liquid inlet ports 10, 10 provided in the nozzle body 4,
Liquid is sucked into the internal mixing chamber 11 from each liquid inlet. The high-speed gas ejected from the primary gas outlet 9 first crushes the liquid entering from the liquid inlet 10 and is mixed in the enlarged internal mixing chamber 11, and the flow rate is reduced to form a liquid at the front end of the nozzle tip 5. Head towards the injection port. On the other hand, the high pressure gas entering from the compressed gas inlet 8 is as shown in FIGS. 4 and 5.
It passes through an outer secondary gas passage 12 provided in the nozzle body 4 and enters a cavity 13 formed by the front surface of the nozzle body 4, the jet plate cap 1, the core 2, and the outer periphery of the nozzle tip 5. Then, it passes through the gap (swivel guide hole) formed by the secondary gas blowout groove 14 provided in a spiral along the outer circumference of the core 2 and the inner surface of the spout plate cap 1, and the spout plate cap 1 and the core The nozzle tip 5 enters a vortex chamber 15 formed by the front recess of the nozzle tip 2 and the outer periphery of the tip of the nozzle tip 5. Then, it becomes a high-speed vortex in the vortex chamber 15 and is injected from the narrow annular gap 16, which is a gas injection port formed by the tip of the nozzle tip and the inner circumferential edge of the jet plate cap 1, as a tapered cone-shaped high-speed vortex. At this time, the mixed liquid jetted forward of the nozzle tip 5 at a reduced flow rate from the internal mixing chamber 11, which is a liquid jetting port, is crushed and atomized and sprayed forward while being subjected to secondary mixing.

FIG. 6 is a cross-sectional view of a second embodiment of the two-fluid nozzle of the present invention, and corresponds to FIG. 5. This embodiment differs from the previous embodiment in that three secondary gas passages 12 are provided along the internal mixing chamber 11 to constitute a second airflow passage.

FIG. 8 is a basic explanatory diagram when mixed spraying is performed using the two-fluid nozzle of the first embodiment described above. The gas sent from the compressor E is pressure regulated by the regulator D, passes through the valve C, passes through the pipe B, and enters the two-fluid nozzle A of the present invention. On the other hand, the liquid sent from the liquid tank G by self-priming, pressurization, or liquid pump H passes through the liquid valve I, adjusts the amount of each liquid by the liquid metering valve J, and then passes through the liquid pipe F to the nozzle. The two liquids enter separately from the two liquid inlets and are mixed and sprayed by the nozzle A by the above-mentioned action.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, it is possible to achieve ultra-atomization of two or more types of liquids, and even if the liquid to be atomized has a high viscosity, there will be no clogging, dripping, or dripping. There is no problem caused by liquid particles adhering to the vicinity of the liquid injection port. Therefore, depending on the nature of the stock solution being mixed, precipitation may occur, or it may harden by mixing, or it may be possible to mix and atomize liquids that do not mix, such as water and oil, so it is difficult to use with a spray dryer, etc. It contributes to many industries that require atomization of mixed liquids, such as granulation of mixed liquids, combustion using fuel and auxiliary agents in the combustion process, and spraying processes such as glazes in the ceramics industry. It is.

[Brief explanation of the drawing]

Fig. 1 is an external plan view of a two-fluid nozzle according to a first embodiment of the present invention, Fig. 2 is a front view, Fig. 3 is a cross-sectional view taken along line A-A' in Fig. 2, and Fig. 4 is a cross-sectional view of Fig. 2. FIG. 5 is a sectional view taken along line C-C' in FIG. The explanatory diagram, FIG. 8, is a basic explanatory diagram using the nozzle of the present invention. DESCRIPTION OF SYMBOLS 1... Spray plate cap, 2... Core, 3... Tightening ring, 4... Nozzle body, 5... Nozzle tip, 6... Compression spring, 7... Threaded part, 8...
...Compressed gas inlet, 9...Primary gas outlet, 10
...Liquid inlet, 11...Internal mixing chamber forming a first air passage and liquid injection port, 12...Secondary gas passage which is a second air passage, 13...Cavity, 1
4...Secondary gas ejection groove which is a turning guide hole, 15...
Whirlpool chamber, 16...An annular gap that is a gas injection port.

Claims (1)

[Claims] 1. A liquid injection port through which the liquid to be atomized is ejected together with gas, a vortex chamber formed at a position surrounding the liquid injection port, and a vortex chamber that extends into the vortex chamber in a spiral shape to generate a high-speed swirling flow in the vortex chamber. a swirl guide hole that introduces a high-speed airflow into the vortex chamber; an annular injection port that is formed at a position facing the liquid injection port of the vortex chamber and that injects and forms a tapered conical high-speed vortex in front of the liquid injection port; A two-fluid nozzle for generating ultrafine particles using a high-speed eddying gas comprising: a nozzle tip where the liquid injection port and the gas injection port are opened; , air flow passages extend from a single compressed gas inlet to the swirl guide hole and the liquid injection port, respectively, and a plurality of liquid feed ports are opened in the air flow passage extending to the liquid injection port, and each liquid feed A two-fluid nozzle characterized in that the liquid guided from the mouth is crushed and mixed by airflow and then guided to the liquid injection port.