JP2010064029A - Fluid delivery device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid delivery device in which a consumption amount of air is less, a particle diameter of a liquid drop is small and a collision force is large. <P>SOLUTION: The fluid delivery device is provided with a chamber in which a fluid intrudes and is mixed, at least one acceleration unit installed in the chamber or connected to the chamber and used for acceleration of the fluid in the chamber, and a fluid outlet portion connected to one end of the acceleration unit. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a fluid ejection device, and in particular, an acceleration unit having a reduced cross-sectional area is installed inside the device to accelerate a fluid to be ejected, and the acceleration unit further has a function of ejecting two fluids equally. It relates to a spraying device.

  The nozzle device is an application of the liquid atomization principle, and the liquid atomization principle is classified into two types of one fluid and two fluids. The one-fluid nozzle is called a liquid pressurizing nozzle and pressurizes the liquid to a required pressure by using a pump, and then flows into a special mechanism inside the nozzle and finally disperses from the outlet. Since this type of nozzle has a large average spray particle size, if it is desired to reduce the spray particle size, it is necessary to increase the operating pressure or reduce the pore size, which causes problems related to pump selection and nozzle clogging. . The two-fluid nozzle is called a gas-assisted nozzle, which collides high-pressure gas (generally air) with the liquid, breaks the surface tension of the liquid, makes the liquid a fine mist, and disperses it from the outlet. Compared with the one-fluid nozzle, the two-fluid nozzle can generate a fine particle size, and since the nozzle has a large hole diameter, foreign matter is hardly clogged and the flow rate adjustment range is large.

The atomization mechanism of the two-fluid nozzle can be classified into internal atomization and external atomization. External atomization means that after the liquid leaves the system, the gas directly collides with the liquid on the outside, the gas and liquid are mixed and atomized, and the working area is located outside, so the pressure cannot be reused. . Internal atomization is achieved by supplying gas in the nozzle body, causing the gas to collide with the liquid, mixing the liquid and gas in the mixing chamber, and the required spraying mode and the various types of outlet holes (circular or elongated openings, etc.) An effect is formed on the specified surface. External atomization is usually used in high humidity or low temperature environments, and internal atomization is usually used for object cleaning, liquid spraying or billet cooling, depending on the outlet hole design. In the two-fluid nozzle according to the prior art, it is difficult to simultaneously satisfy the three conditions of low air consumption, small droplet particle size, and high collision force. The smaller the air consumption, the smaller the collision force. The droplet size is large. Conversely, the smaller the particle size, the greater the required impinging force, the greater the air consumption, and the greater amount of air will take a larger proportion of droplets from the airflow. When the impact velocity is increased by increasing the droplet velocity by reducing the pore diameter, the gas velocity has the sound speed as a limit point, and thus the above three conditions cannot be satisfied simultaneously by reducing the pore diameter.
JP 2008-93564 A

A first object of the present invention is to provide a fluid ejecting apparatus in which one or a multi-stage acceleration unit is installed in the main body of the fluid ejecting apparatus to increase the fluid velocity. In the two-fluid spray system according to the prior art, the pressurized air can be used only once, and most of the pressurized air disappears into the atmosphere after one acceleration. By installing one or multistage acceleration unit, air can be recovered and used multiple times, droplets can be accelerated multiple times, the required droplet velocity can be achieved, droplet velocity Or, when the particle size reaches the required level, the air pressure can be reduced, so the nozzle device with the acceleration unit can increase the droplet velocity without increasing the pressure. It is possible to reduce the air consumption.
A second object of the present invention is to provide a fluid ejection device that can achieve a larger impact force and a smaller droplet size by installing an acceleration unit. The finer the particle size, the faster the speed, the smaller the particle size, the smaller the water droplets, the higher the work efficiency, and the cooling of billets, LCD glass substrate cleaning, environmental humidification or disinfection, etc. Can be applied.

  In order to solve the above-mentioned object, the invention of claim 1 is a chamber in which fluid enters and is mixed, and is installed in or connected to the chamber, and is used for acceleration of the fluid in the chamber. A fluid discharge device comprising: at least one acceleration unit; and a fluid outlet portion connected to one end of the acceleration unit.

  The invention according to claim 2 is the fluid ejection device according to claim 1, wherein the fluid ejection device is a two-fluid spray system.

  The invention according to claim 3 is the fluid ejection device according to claim 2, wherein the fluid ejection device is a nozzle.

  The invention according to claim 4 is the fluid ejection device according to claim 2, wherein the fluid ejection device is an air knife atomization system.

  The invention according to claim 5 is the fluid ejection device according to claim 1, wherein the acceleration unit is at least one venturi tube.

  The invention according to claim 6 is the fluid ejection device according to claim 1, wherein the acceleration unit is at least one orifice.

The present invention provides a fluid ejection device in which an acceleration unit is installed. The fluid ejection device can be a two-fluid spray device with internal atomization, the nozzle with the acceleration unit can be used in the nozzle body, and at least one acceleration in the mixing chamber that causes the gas to collide with the liquid A unit can be installed and the acceleration unit can be a venturi tube as shown in FIG. 8 or an orifice as shown in FIG. The acceleration unit can increase the droplet velocity in a situation where the air pressure is not increased, recover and reuse the air, reduce the air pressure and consumption required for atomization, and increase efficiency Pressure can be applied. As shown in FIGS. 6 and 7, the fluid ejection device in which the acceleration unit is installed can be an air knife atomization system. In the structure of the air knife, in addition to the atomization mechanism, at least one acceleration unit is installed. In this way, the flow of the two fluids is made uniform by acceleration by the acceleration unit, and almost completely sprayed uniformly and vertically on the surface to be sprayed. And can solve the problem of non-uniform distribution in the plurality of fan-shaped two-fluid nozzles of the prior art.

Embodiments showing the objects, features, and effects of the present invention will be described in detail with reference to the drawings.

The present invention relates to a fluid ejection device, and more particularly to a two-fluid spray device.

The two-fluid spraying device of the present invention belongs to an internal atomization device, and at least one acceleration unit having a reduced cross-sectional area is installed on a mixing chamber that causes a gas to collide with a liquid. After the gas and liquid enter the mixing chamber and are uniformly mixed in the mixing chamber, they pass through the acceleration unit. The acceleration unit includes venturi tubes 702 and 704 having a structure in which the inner wall at one end is reduced and the inner wall at one end is gradually enlarged (see FIG. 8). One end where the inner wall of the acceleration unit contracts is connected to the outlet of the mixing chamber, and when the liquid or gas flows through the contracted inner wall, the cross-sectional area is reduced, so that the speed of the two fluids is increased. The acceleration unit can be an orifice 802, 804 with a reduced cross-sectional area as shown in FIG. 9, which can also increase the speed of the two fluids. In the following examples, a nozzle device in which an acceleration unit is installed is compared with a nozzle device in which no acceleration device is installed, and the droplet velocity at the outlet portion is shown. Since the liquid collides with the gas and forms fine droplets to become a discontinuous phase, the momentum conservation law (m ₁ v ₁ = m ₂ v ₂ : m is a droplet when the droplet reaches the outlet hole. The velocity of the droplet cannot be directly calculated by mass (v is droplet velocity), but is calculated by the momentum conservation law, the mass conservation law, and the energy conservation law. The following examples demonstrate the concept of the present invention and its effects.

  The first embodiment of the present invention is a two-fluid nozzle 200 in which a venturi tube is installed (see FIG. 2).

  A comparison of droplet velocities at the outlet portion of the two-fluid nozzle in which the acceleration unit according to the prior art is not installed and the two-fluid nozzle in which the acceleration unit according to the present embodiment is installed is shown below.

  FIG. 1 shows a two-fluid nozzle 100 without a prior art acceleration unit, the structure of which is provided with a mixing chamber 101 and an outlet hole 102 from left to right.

  Each condition of the two-fluid nozzle 100 where no acceleration unit is installed is shown below.

a. Air velocity in mixing chamber 101: 15 m / s
Water drop speed 7.5m / s
Water droplet size: 30 μm
Temperature: 25 ° C
Pressure: 3kg / cm2G
Inner chamber diameter D11: 6 m / m
b. PT11 to PT12 length d11: 5mm
c. Exit hole 102 exit hole diameter D12: 1.8 m / m
d. PT12 to PT13 length d12: 5mm

  FIG. 2 shows a two-fluid nozzle 200 in which one acceleration unit is installed, and the structure is provided with a mixing chamber 201, a venturi tube 202, a recovery part 203 and an outlet hole 204 from the left to the right.

  Each condition of the two-fluid nozzle 200 in which one acceleration unit is installed is shown below.

a. Air velocity in mixing chamber 201: 15 m / s
Water drop speed 7.5m / s
Water droplet size: 30 μm
Temperature: 25 ° C
Pressure: 3kg / cm2G
Inner chamber diameter D21: 6 m / m
b. PT21 to PT22 length d21: 5mm
c. Venturi tube 202
Minimum diameter D22: 1.8 m / m
d. PT22 to PT23 length d22: 5mm
e. Collection unit 203
Inner chamber diameter D23: 6 m / m
f. PT23 to PT24 length d23: 5mm
g. Exit hole 204 part Exit hole diameter D24: 1.8 m / m
h. PT24 to PT25 length d24: 5mm

In the above two examples, all other conditions are the same except for the acceleration unit. In the above two examples, it is assumed that a water droplet having a particle size of 30 μm does not change in particle size during the acceleration process. Tables 1-1 to 1-2 and Tables 2-1 to 2-4 show the results obtained by the numerical diffraction method based on the dimensions.

The numerical values in the last row in Table 2-4 are the data of the PT25 portion of the two-fluid nozzle 200, and the data are shown below.
Air speed: 51.8123m / s
Air temperature: 297.89K
Pressure: 0.2684 * 10 ⁶ Pa
Water droplet speed: 68.8067 m / s

  The numerical values in the last row of Table 1-2 are data of the PT13 portion (5 mm from the outlet hole) of the two-fluid nozzle 100, and the data is shown below.

Air velocity: 43.6308 m / s
Air temperature: 297.81K
Pressure: 0.3186 * 10 ⁶ Pa
Water drop speed: 50.2845 m / s

  As can be seen from the above numerical values, the water droplet velocity in the 5 mm portion from the outlet of the two-fluid nozzle 200 where the venturi tube is installed is 68.8067 m / s, and 5 mm from the outlet of the two-fluid nozzle 100 where no acceleration unit is installed. The water droplet speed of the part is 50.2845 m / s, and the speed difference between the two is 18.5222 m / s. That is, the acceleration effect on the water droplets of the acceleration unit reaches 36.8%. However, in the two-fluid nozzle 200, the pressure loss that passes through the acceleration unit and reaches the PT 23 is 10.8%, so that a reusable pressure remains, and a nozzle device in which a plurality of acceleration units are installed is designed. can do. Accordingly, in the following second embodiment, two venturi tubes 302 and 304 are installed in the two-fluid nozzle 300 to form an acceleration unit.

  The second embodiment of the present invention is a two-fluid nozzle 300 in which two venturi pipes are installed (see FIG. 3).

  The following is a comparison of the droplet velocities at the outlet of the two-fluid nozzle 100 in which no acceleration unit according to the prior art is installed and the two-fluid nozzle 300 in which two acceleration units according to the present embodiment are installed.

  FIG. 3 shows an acceleration unit in which two venturi pipes 302 and 304 are installed in a two-fluid nozzle 300, and the structure is a mixing chamber 301, a venturi pipe 302, a recovery section 303, a venturi pipe 304, and a recovery section from left to right. 305 and an outlet hole 306 are provided.

  Each condition of the two-fluid nozzle 300 is shown below.

a. Air velocity in mixing chamber 301: 15 m / s
Water drop speed 7.5m / s
Water droplet size: 30 μm
Temperature: 25 ° C
Pressure: 3kg / cm2G
Inner chamber diameter D31: 6 m / m
b. PT31 to PT32 length d31: 5mm
c. Venturi tube 302
Diameter D32: 1.8 m / m
d. PT32 to PT33 length d32: 5mm
e. Collection unit 303
Diameter D3: 6m / m
f. PT33 to PT34 length d33: 5mm
g. Venturi 304
Diameter D34: 1.8 m / m
h. PT34 to PT35 length d34: 5mm
i. Collection unit 305
Diameter D35: 6m / m
j. PT35 to PT36 length d35: 5mm
k. Exit hole 306
Outlet hole diameter D36: 2.0 m / m
l. PT36 to PT37 length d36: 5mm

表３‐６における最終行の数値は二流体ノズル３００のＰＴ３７（出口から５ｍｍ）部分のデータであり、そのデータを下記に示す。
空気速度：４６．８０８２ｍ／ｓ
空気温度：２９８．４１Ｋ
圧力：０．２８２９Ｅ＋６Ｐａ
水滴速度：７２．６３０６ｍ／ｓ In the above two examples, assuming that a water droplet having a particle size of 30 μm does not change its particle size in the acceleration process, the results obtained by calculation by the numerical diffraction method on the basis of one dimension are shown in Table 3. -1, 3-2, 3-3, 3-4, 3-5, 3-6.

The numerical values in the last row in Table 3-6 are data of the PT37 portion (5 mm from the outlet) of the two-fluid nozzle 300, and the data are shown below.
Air speed: 46.8082 m / s
Air temperature: 298.41K
Pressure: 0.2829E + 6Pa
Water drop speed: 72.6306 m / s

  As can be seen from the above numerical values, the water droplet velocity in the 5 mm portion from the outlet of the two-fluid nozzle 300 in which two acceleration units are installed is 72.6306 m / s, and the outlet of the two-fluid nozzle 100 in which no acceleration unit is installed. The water droplet velocity in the 5 mm portion is 50.2845 m / s, the difference between the two is 22.3461 m / s, and the acceleration effect on the water droplets of the two acceleration units reaches 44.4%.

  As can be seen from the above two embodiments, the two-fluid nozzle 100 in which the air pressure is not increased and the outlet hole diameter (2 m / m) of the two-fluid nozzles 200 and 300 in which the acceleration unit is installed is not installed in the acceleration unit. Water droplets passing through the accelerating unit are reliably accelerated under a condition not smaller than the outlet hole diameter (1.8 m / m).

  FIG. 4 shows another embodiment of the present invention, and is a simplified diagram of a two-fluid nozzle device using one orifice as an acceleration unit.

  FIG. 5 shows another embodiment of the present invention, and is a simplified diagram of a two-fluid nozzle device having two orifices as acceleration units.

  FIG. 6 is a simplified view of the above-described venturi tube applied to an air knife atomization system. The above-described venturi tube 502 is applied to the air knife atomization system 500, and the two fluids discharged by the venturi tube 502 can be sprayed on the surface of an object to be sprayed under the condition that the droplet velocity is increased uniformly.

  FIG. 7 shows another embodiment of the present invention, and is a simplified diagram showing a state where an orifice is applied to an air knife atomizing system.

  As can be seen from the above embodiments, the fluid ejection device provided with the acceleration unit of the present invention has the effect of reliably accelerating the fluid. The above detailed description shows preferred embodiments of the present invention and is not intended to limit the scope of the present invention. All changes and modifications of the equivalent effects based on the scope of the claims of the present invention are included in the scope of the claims of the present invention.

It is a simplified diagram showing the structure of a two-fluid nozzle in which no acceleration unit is installed. It is a simplified diagram showing the structure of a two-fluid nozzle in which one venturi tube is installed to be an acceleration unit. It is a simplified diagram showing the structure of a two-fluid nozzle in which two venturi pipes are installed to serve as an acceleration unit. FIG. 6 is a simplified diagram showing a two-fluid nozzle device in which another orifice of the present invention is provided and an orifice is installed as an acceleration unit. FIG. 6 is a simplified diagram showing a two-fluid nozzle device in which two orifices are installed to form an acceleration unit according to another embodiment of the present invention. It is a simplified diagram showing an air knife device in which a venturi tube is installed to be an acceleration unit. It is a simplified diagram showing an air knife device which is an acceleration unit provided with an orifice. It is a simplified diagram showing the structure of a venturi tube. It is a simplified diagram showing the structure of an orifice.

Explanation of symbols

200 Two-fluid nozzle 201, 301 with one acceleration unit installed, 301 Mixing chamber 202, 302, 304, 502, 702, 704 Venturi 203, 303, 304, 305 Recovery unit 204, 306 Outlet hole 300 Two acceleration units Installed two-fluid nozzles 402, 404, 406, 602, 802, 804 Orifice 500, 600 Air knife atomization system

Claims (6)

A chamber into which fluid enters and is mixed;
At least one acceleration unit installed in or connected to the chamber and used to accelerate fluid in the chamber;
And a fluid outlet portion connected to one end of the acceleration unit.   The fluid ejecting apparatus according to claim 1, wherein the fluid ejecting apparatus is a two-fluid spray system.   The fluid ejection device according to claim 2, wherein the fluid ejection device is a nozzle.   The fluid ejection device according to claim 2, wherein the fluid ejection device is an air knife atomization system.   The fluid ejection device according to claim 1, wherein the acceleration unit is at least one venturi tube.   The fluid ejection device according to claim 1, wherein the acceleration unit is at least one orifice.

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