JPH0760170A - Liquid atomizer - Google Patents

Abstract

PURPOSE:To obtain spray of uniform particle diameter in the wide range of control of the atomized quantity by installing a circular chamber, a jet hole, circular introducing passes, liquid feeding pipes for feeding liquid from separate routes, valve discs of the liquid feeding pipes, and a liquid feeding part for feeding liquid to the liquid feeding pipes in its compressed state. CONSTITUTION:A liquid is sucked from a tank 6 and fed to liquid feeding pipes 8a, 8b in its compressed state. The liquid from the liquid feeding pipe 8a arrives in a liquid chamber 10 of a body 9 and is fed to a circular chamber 16 from a circular introducing pass 15a, and the liquid fed from the liquid feeding pipe 8b is fed to the circular chamber 16 from the circular introducing pass 15b. The circular introducing passes 15a, 15b are tangentially installed to the circular chamber 16. Therefore, the liquid in the circular chamber 16 is given turning force and its turning force is increased as it advances toward the center. It is jetted as a turning liquid film 18 from a jet hole 17 installed downstream of the circular chamber 16, and atomized by the shear forcing due to the relative velocity difference between the jet velocity and the turning velocity of the liquid film 18 to surrounding air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid atomizer which is used, for example, in humidifiers, medical equipment, combustion equipment and the like to atomize water, oil, chemical solutions and the like.

[0002]

2. Description of the Related Art Atomization of liquids is used in various fields, and there are various kinds of atomization means. As the atomizing means, a pressure spray method in which a liquid is pressurized to form a swirling liquid film and sprayed is often used. In the pressure atomization type liquid atomizer, as shown in FIG. 5, the liquid supplied in a pressurized state by the pressurizing pump 1 flows from the swirling groove 2 to the swirling chamber 3.
Then, a swirl force is applied in the swirl chamber 3, and the swirl chamber 3 ejects the swirl force from the injection hole 4. The liquid film 5 is divided and atomized by the shearing force generated in the hollow inverted conical film 5 due to the relative velocity difference between the jetting speed and swirling speed of the liquid and the ambient air.

[0003]

However, in the above-mentioned conventional atomization apparatus of the pressure atomization system, when the pressure of the pressurizing pump 1 is reduced to reduce the atomization amount, the liquid flow rate decreases, and the injection hole 4 is formed.
Since the jetting speed and the swirling speed of the liquid jetted from the liquid are reduced, the liquid film thickness of the hollow inverted-cone liquid film 5 becomes thicker, and the relative velocity difference with the surroundings becomes smaller, and the shear acting on the liquid film becomes smaller. As a result of the reduced force, the particle size becomes coarse and the atomized state deteriorates. Therefore, although the pressure of the pressure pump 1 can be adjusted to some extent within the variable region, there is a problem that the adjustment range of the atomization amount cannot be made large.

The present invention solves the above problems, and provides a liquid atomizing apparatus capable of improving atomization characteristics and obtaining a spray having a uniform particle size in a wide control range of atomization amount. .

[0005]

In order to achieve the above object, according to a first aspect of the present invention, a swirl chamber filled with liquid, an ejection hole provided on the downstream side of the swirl chamber, and a swirl flow are generated in the swirl chamber. A plurality of swirl introduction paths for introducing the liquid,
Liquid supply pipes for supplying liquid to the swirl introduction passages from different paths, valve bodies provided in the passages of the respective liquid supply pipes, and liquid supply unit for supplying liquid to the liquid supply pipes under pressure. It is configured to have.

Further, according to a second aspect of the present invention, the swirl chamber filled with the liquid, the ejection holes provided on the downstream side of the swirl chamber, and the plurality of swirl introductions for introducing the liquid so as to generate the swirl flow in the swirl chamber. A passage, a liquid supply pipe for supplying liquid to each of the swirl introduction passages from a different route, and a plurality of liquid supply units provided in each of the liquid supply pipes for supplying the liquid in a pressurized state. .

[0007]

According to the present invention, the amount of the liquid supplied from the respective swirl chamber introduction passages to the swirl chamber is adjusted under the same pressurization condition by opening and closing the valve element of each supply pipe. By doing so, the swirl state in the swirl chamber can be kept constant even if the liquid supply amount is changed, so that a good spray state can be obtained in a wide adjustment range of the spray amount.

Further, according to the second aspect of the invention, since the liquid supplied to each liquid supply pipe can be adjusted by each liquid supply section, the spray amount can be adjusted more finely.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the liquid atomizer of claim 1. The liquid is sucked up from the tank 6 by the liquid supply unit 7 and is supplied to the liquid supply pipes 8a and 8b under pressure. The liquid supplied from the liquid supply pipe 8a reaches the liquid chamber 10 in the body 9, and is supplied in the tip direction of the body 9 through the liquid passage 12 provided in the swirl chamber retainer 11. A valve body 13 is provided on the liquid supply pipe 8b. The liquid supplied from the liquid supply pipe 8 a is supplied to the swirl chamber 16 from the swirl introduction passage 15 a provided in the nozzle head 14 at the tip of the body 9. Similarly, the liquid supplied from the liquid supply pipe 8b is supplied to the swirl chamber 16 from the swirl introduction passage 15b provided in the nozzle head 14. The swirl chamber 16 is formed by shielding the bottom surface thereof with the swirl chamber retainer 11.
The swirl introduction passages 15a and 15b are provided in a tangential direction to the swirl chamber 16, and therefore, the liquid supplied to the swirl chamber 16 is given a swirl force, and the swirl force is increased as the liquid proceeds to the center. The swirl liquid film 18 is jetted from a jet hole 17 provided downstream of the swirl chamber 16 to form the liquid film 1
It is atomized by the shearing force due to the difference in relative velocity between the jetting speed and the turning speed of No. 8 and the ambient air.

FIG. 2 shows the spray characteristics of the atomizing apparatus of the embodiment shown in FIG. In the figure, the column A indicates P1 when the liquid supply unit 7 is spraying at a predetermined pressure, the lower limit pressure P2 at which the spray is performed well, and the column B indicates whether the valve 13 is open or closed. Shows. When A = P1 and B = ON, the spraying state is the best, the spraying amount is maximum, and the particle size is also small. Generally, when the pressure of the liquid supply unit 7 is lowered, the atomized state deteriorates, but it can be adjusted to some extent according to the purpose of use of the atomizer. The limit state at that time is A = P2,
B = ON, the spray amount decreases, and the particle size increases a little. The pressure atomization type atomizer shown in the conventional example of FIG. 5 has a limit in this state and can be adjusted only in a narrow range. However, in the present embodiment, the turning introduction paths 15a, 15
Since the liquid supply pipes 8a and 8b and the valve body 13 each having different paths are provided in b, the adjustment range of the spray amount can be expanded. That is, in the state of A = P1 and B = OFF, the liquid is supplied to the swirl chamber 16 only from the swirl introduction passage 15a, so that the spray amount is reduced. However, the liquid supply pressure is P1
Since the flow velocity of the liquid supplied from the swirl introduction path 15a to the swirl chamber 16 is the same as when A = P1 and B = ON,
The swirling state of the liquid in the swirling chamber 16 and the state of the liquid film 18 formed from the ejection holes 17 are also equal, and the atomized state is good and the particle size is about the same. Similarly, A = P
Although the spray amount is also reduced when 2 and B = OFF, the spray characteristics are similar to those when A = P2 and B = ON.

FIG. 3 shows an embodiment of the liquid atomizer of claim 2.
This is an example. The difference from the embodiment of FIG.
The liquid supply portions 19a, 19a are respectively connected to the liquid supply pipes 8a, 8b of the path.
(P _A), 19b (P_B) Is provided. This structure
The pressure of the liquid supply portions 19a and 19b from P1 to P2
Can be set separately up to
The adjustment range of can be further expanded.

FIG. 4 shows the spray characteristics of the atomizing apparatus of the embodiment shown in FIG. In the figure, the P _A column is the liquid supply unit 19
The pressure state of "a" and the P _B column show the pressure states of the liquid supply portion 19b by P1, P2, and OFF. As is apparent from FIG. 4, since the pressures of the liquid supply portions 19a and 19b can be set individually from P1 to P2, the spray amount can be adjusted in a wide range from Q5 to Q8 in a stepless manner. The pressure varies from P1 to P2, and a good state in which both the particle size and the spray state are stable can be obtained.

Further, in the embodiment of FIGS. 1 and 2, the case where the swirl introduction path and the liquid supply pipe are two has been described for simplification of description, but even if each of them is two or more, they are equivalent or more. The effect of is obtained.

[0015]

As is apparent from the above description, claim 1
The liquid atomization device is provided with a plurality of swirl introduction paths for introducing the liquid into the swirl chamber, a liquid supply pipe for supplying the liquid to the swirl introduction path from different paths, and a path for each of these liquid supply pipes. Since the valve body and the liquid supply section for supplying the liquid to the liquid supply pipe under pressure are provided, the amount of the liquid flowing into the swirl chamber can be controlled by keeping the swirl state constant by opening and closing the valve body. It can be adjusted, and a large adjustment range of the spray amount can be taken in a sprayed state or a state where the particle size is uniform.

Further, in the liquid atomizing apparatus according to a second aspect of the invention, a plurality of swirl introducing passages for introducing the liquid into the swirl chamber, a liquid supply pipe for supplying the liquid to the swirl introducing passages from different routes, and the liquid supply Since each pipe is equipped with a liquid supply unit that supplies liquid in a pressurized state, the liquid supply pressure to the liquid supply pipes can be independently adjusted to finely adjust the spray amount, and also the spray amount. The adjustment range of can be made larger.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a liquid atomizer according to an embodiment of claim 1 of the present invention.

FIG. 2 is a characteristic diagram of the device.

FIG. 3 is a cross-sectional view of an essential part of a liquid atomizer according to an embodiment of claim 2 of the present invention.

FIG. 4 is a characteristic diagram of the device.

FIG. 5 is a sectional view of a main part of a conventional liquid fuel combustion device.

[Explanation of symbols]

 7 Liquid Supply Section 8 Liquid Supply Pipe 13 Valve Body 15 Swirling Introduction Path 16 Swirling Chamber 17 Jet Hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norio Nobuya 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A swirl chamber filled with liquid, jet holes provided on the downstream side of the swirl chamber, a plurality of swirl introduction passages for introducing liquid so as to generate a swirl flow in the swirl chamber, A liquid supply pipe that supplies liquid to the swirl introduction passage from different routes, a valve body provided in the route of each of the liquid supply pipes, and a liquid supply unit that supplies liquid to the liquid supply pipe in a pressurized state. Liquid atomizer having. 2. A swirl chamber filled with liquid, jet holes provided on the downstream side of the swirl chamber, a plurality of swirl introduction passages for introducing liquid so as to generate a swirl flow in the swirl chamber, A liquid atomization device having a liquid supply pipe for supplying liquid to each of the swirl introduction passages from a different route, and a plurality of liquid supply units provided in each of the liquid supply pipes for supplying liquid in a pressurized state.