JPH05138083A - Micro-granulation device of liquid - Google Patents

Abstract

PURPOSE:To obtain uniform micro-particles across the extensive adjustment range of a mist spray volume. CONSTITUTION:Micro liquid ejection holes 11 are provided on the flat part 10 formed at the tip of a liquid nozzle 5, and an air nozzle 13 having an air ejection hole 14 which supplies an air for micro-granulation to an air spewed from the liquid ejection holes 11 is provided on the periphery of the liquid nozzle 5. Therefore, the liquid can be ejected in a dispersed liquid columnar phase from the micro liquid ejection holes 11 and a shearing power can be applied to act on this micro liquid column using a high-speed air steam. Subsequently, particles of very tiny particle diameter can be obtained across the extensive range of a mist spray volume using a small flow of low pressure 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 used for coating, a liquid fuel combustion device, a humidifier and the like.

[0002]

2. Description of the Related Art Atomization of a liquid is used in various fields, but conventionally, a pressure spray type nozzle has been generally used. In this method, after the liquid is pressurized to a predetermined pressure, a swirling force is applied and the liquid is ejected as a conical liquid film from the ejection holes, and the liquid film is divided into fine particles. However, this pressure atomization type atomizer is capable of atomizing when sprayed at a constant pressure and a constant flow rate, and when the pressure of the liquid is reduced to reduce the flow rate, a liquid film is not formed and the particle size is reduced. Becomes coarse and no atomization can be obtained.

A two-fluid atomizer is effective for obtaining a spray state in a wide control range of liquid flow rate. As shown in FIG. 4, the two-fluid atomizer is provided with an air nozzle 3 on the outer periphery of a liquid nozzle 2 having a liquid ejection hole 1 for ejecting a pressurized liquid, and the liquid ejection hole near the tip of the air nozzle 3. An air ejection hole 4 is provided in the vicinity of 1. The liquid supplied from the liquid supply means (not shown) to the liquid nozzle is ejected from the liquid ejection hole 1, and the air supplied from the air supply means (not shown) to the nozzle 3 is discharged from the air ejection hole 4 at a high speed. When it was ejected, it was atomized by the shearing force.

[0004]

However, in the above-described conventional structure, since the liquid ejection hole 1 is a single circular hole, if the liquid pressure is increased to increase the spray amount, the ejection flow velocity increases. Since the action point of the atomizing air moves to the downstream side of the liquid ejection hole and the air flow velocity becomes slow, effective atomization cannot be performed and the particle diameter becomes large. Therefore,
With the two-fluid nozzle of the above-mentioned conventional example, by spraying the atomizing air, a spray state can be obtained in a wide adjustment range of the liquid flow rate, but it is difficult to obtain particles with a uniform particle size in that adjustment range. there were.

The present invention is intended to solve the above problems and is a liquid capable of obtaining fine particles having a uniform particle size in a large control range of the spray amount from a large flow rate to a small flow rate, with a gas having a low pressure and a small flow rate. It is an object of the present invention to provide an atomizing device of

[0006]

In order to achieve the above object, a liquid atomizer of the present invention is provided with a liquid nozzle having a liquid chamber for supplying the liquid in the central portion, and a liquid nozzle formed at the tip of the liquid nozzle. Flat portion, a plurality of fine liquid ejection holes provided on the flat portion for ejecting the liquid supplied from the liquid chamber, and atomized into the liquid ejected from the liquid ejection hole on the outer periphery of the liquid nozzle. And a gas nozzle having a gas ejection hole for supplying working air.

[0007]

With the above-described structure, the present invention disperses and ejects liquid from a plurality of fine liquid ejection holes into fine liquid columns and applies a shearing force due to a high-speed air flow. With a gas, it is possible to obtain particles with a very small particle size over a wide control range of the spray amount.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, a liquid nozzle 5 is provided with a liquid chamber 6 in the center and is connected to a nozzle holder 7.
A liquid passage 8 is provided in the nozzle holder 7, and liquid is supplied to the liquid chamber 6 from a liquid supply pipe 9 connected to the rear portion of the nozzle holder 7 through the liquid passage 8. A flat portion 10 is formed at the tip of the liquid nozzle 5, and a plurality of fine liquid ejection holes 11 are provided. Below the liquid nozzle 5, a filter 12 formed of a three-dimensional mesh structure having a pore diameter smaller than that of the liquid ejection hole 11 is provided.
Is installed. Reference numeral 13 denotes an air nozzle which is a gas nozzle, and the nozzle holder 7 having the liquid nozzle 5 mounted therein is mounted inside the air nozzle 13. An air ejection hole 14, which is a gas ejection hole, is provided at the tip of the air nozzle 13 in axial symmetry with respect to the central axis of the liquid nozzle 5. A gap 1 between the tip of the liquid nozzle 5 and the tip of the air nozzle 13 is provided in the air ejection hole 14 portion.
A gap regulating portion 15 that regulates 6 is provided. An air supply pipe 18 having an air hole 17 is connected to a side portion of the air nozzle 13, and an air hole 17 of the air supply pipe 18 is provided via an air passage 19 provided between the liquid nozzle 5 and the air nozzle 13. From the above, atomizing air is supplied to the air ejection holes 14.

In the above structure, when a power source (not shown) is turned on, a liquid supply device (not shown) is activated, and the liquid is pressurized and passes through the liquid supply pipe 9 to the liquid passage 8 in the nozzle holder 7. After being supplied, the filter 12 removes fine dust and the like, and then is ejected from the plurality of fine liquid ejection holes 11 through the liquid chamber 6.

At the same time, an air supply means (not shown) is activated, atomizing air is supplied from the air holes 17 to the air passage 19 through the air supply pipe 18, and is ejected from the air ejection holes 14 at high speed through the gaps 16. To be done. Therefore, the fuel jetted from the liquid jet hole 11 is sheared by the air flow,
Atomized.

Usually, in order to increase the amount of spray with a single-hole atomizer, the liquid ejection hole 1 is enlarged as described in the conventional example, but in this case, the ejected liquid column also becomes large, so atomization is required. There is a limit to atomization even if the working air is applied. On the contrary, if the liquid ejection hole 1 is made smaller for atomization, a small particle diameter can be obtained when the amount of spray is small, but when the amount of spray is increased, the jet flow velocity of the liquid becomes higher, so that the action point of the atomizing air is The air flow velocity moves to the downstream side of the liquid ejection hole 1 where the flow velocity becomes slower, so that effective atomization cannot be performed and the particle size becomes rather coarse.

However, in this embodiment, by providing a plurality of fine liquid jet holes 11, the jet flow of the liquid is divided into fine liquid columns, and the high-speed atomizing air is directly applied to the fine liquid columns. Is supplied, fine particles can be obtained. In this case, when the amount of spray is changed, the jet velocity is naturally changed, but since the jet column itself is fine, the atomizing air effectively acts in the vicinity of the jet hole 11, and the particle diameter changes greatly. Does not happen. Furthermore, the tip of the liquid nozzle 5 is a flat portion 10.
As a result, the atomizing air is supplied at a right angle to the jet flow of the liquid, and the shearing force can be effectively applied. Therefore, it is possible to obtain particles having a small particle size over a wide adjustment range of the spray amount with low pressure and low flow rate of air. Further, the nozzle shape enables effective atomization with a lower air pressure.

FIG. 2 shows a structure in which the tip of the liquid ejection hole 11 is slightly projected from the flat portion 10. Air passage 1
The atomizing air supplied from 9 through the gap 16 concentrates from the periphery toward the center and is ejected along the central axis XX ′. At this time, a stagnation point of the air flow occurs near the liquid ejection holes 11, and it is difficult to uniformly apply the air flow to each liquid ejection hole 11. By slightly projecting the tip of the liquid ejection hole 11, a stagnation point can be avoided and a high-speed air flow can be effectively applied.

FIG. 3 shows the arrangement of the liquid ejection holes 11 in the flat portion 10. As shown in FIG. 3 (a), the liquid ejection holes 11 are evenly arranged so as not to overlap the streamline of the atomizing air, so that the atomizing air can be made to act evenly on the liquid jet. FIG. 3B shows an example in which the atomizing air is swirled, and in order to make the swirling flow uniformly act, the liquid jetting holes 11 are arranged on a spiral curve toward the center. In addition, the gap regulating portion 15 as shown in FIG.
By setting it near the tip of the liquid nozzle 5 shown in FIG.
The same effect can be obtained by arranging the liquid ejection holes 11 on the virtual extension line of the gap regulating portion 15 shown in FIG.

As described above, a plurality of minute liquid ejection holes 1
Since a fine fuel liquid column injected from No. 1 is atomized by applying a shearing force by a high-speed air flow, it is a low-pressure air with a small flow rate and a fine particle with a uniform particle size over a wide adjustment range of the spray amount. Can be obtained.

[0017]

As described above, according to the liquid atomizer of the present invention, the following effects can be obtained. (1) A plurality of fine liquid ejection holes are provided on a flat portion formed at the tip of the liquid nozzle, and an air ejection hole for supplying atomization air to the liquid ejected from the liquid ejection hole is provided on the outer periphery of the liquid nozzle. Since the air nozzle has been set up, the liquid is sprayed from a plurality of fine liquid ejection holes into a fine liquid column, and the flat portion causes a shear force due to a high-speed air flow perpendicular to the fine liquid column. Can be effectively operated. Therefore, it is possible to obtain particles having a very small particle size over a wide adjustment range of the spray amount with a gas having a low pressure and a small flow rate. (2) Since the liquid ejection hole has a structure in which the tip is slightly projected from the flat portion, the stagnation point of the air flow can be avoided and a high-speed air flow can be effectively acted, so that uniform fine particles are obtained. be able to. (3) Since the liquid ejection holes are evenly arranged so as not to overlap with the streamline of the atomizing air, the atomizing air is made to act evenly on the liquid jet, which is further effective for uniform atomization.

[Brief description of drawings]

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

FIG. 2 is an enlarged cross-sectional view of a main part of an atomization device of another embodiment.

FIG. 3 (a), (b), (c) A plan view of a main part of an ejection hole portion of an atomizing device according to another embodiment.

FIG. 4 is a cutaway sectional view of a main part of a conventional liquid atomizer.

[Explanation of symbols]

 5 Liquid Nozzle 6 Liquid Chamber 10 Flat Part 11 Liquid Ejection Hole 13 Gas Nozzle 14 Gas Ejection Hole

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

Claims (3)

[Claims] 1. A liquid nozzle having a liquid chamber for supplying a liquid to a central portion, and a flat portion formed at a tip of the liquid nozzle,
A plurality of fine liquid ejection holes for ejecting the liquid supplied from the liquid chamber provided in the flat portion and a liquid for ejecting atomization to the liquid ejected from the liquid ejection holes on the outer periphery of the liquid nozzle are supplied. A liquid atomizer having a gas nozzle having a gas ejection hole. 2. The liquid atomizer according to claim 1, wherein the liquid ejection hole has a tip slightly projected from the flat portion. 3. The liquid atomizer according to claim 1, wherein the liquid ejection holes are evenly arranged so as not to overlap the streamlines of the atomizing gas.