JPH01304070A - Method and device for adjusting density of fume composed of liquid or melt particles - Google Patents

Abstract

PURPOSE:To form a fume of required density by jet spraying intermittently with certain necessary time intervals when fine particles are generated by hitting and jet spraying a melt onto the surface of a head material to form fine particles. CONSTITUTION:Liquid L or a melt M is jet sprayed out of a two-fluid spray nozzle 2 through a spray gun 3, and fine particles are prepared by hitting said spray onto the surface 4 of a hard material. At that time, jet spraying is carried out intermittently with certain necessary time intervals by using a timer 8 to form a fume of required density. As a result, the fume material of low and required density can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field] The present invention relates to a method and an apparatus for adjusting the density of a vapor consisting of fine particles of a liquid or melt in the production thereof.

[Conventional technology]

Conventionally, as a method for producing fine particles of liquid or melt, the liquid or melt is sprayed (SP') from a spray nozzle (122) as shown in FIG.
) and hit it on the hard plate (+24) surface to crush the particles (P') in the spray and produce smaller fine particles (
A method of manufacturing Ps') has been taken. Needless to say, these fine particles constitute atomized bodies, and recently there has been a rapid increase in demand for the use of these atomized bodies. When these atomized bodies are used directly, their density naturally becomes a problem. However, in the above-mentioned conventional spray-to-hard plate collision method for producing fine particles.

Almost no countermeasures have been taught regarding the density adjustment of these smoke bodies.

[Problem to be solved]

In the conventional spray-to-hard-plate collision method for producing fine particles, the generation of atomized particles made of fine particles will be explained.

In the first place, in order to spray a liquid or molten material from a spray nozzle, the required pressure or higher pressure must be applied to the ejected gas in a two-fluid spray, and to the ejected liquid in an airless spray. I have to add it. In other words, there is necessarily a lower limit to the amount of liquid etc. that can be ejected from a spray nozzle, which also relates to the amount of particles produced, which in turn is linked to the density of the aerosol. To be honest, there was a lower limit to the density of the atomized body.

However, as mentioned above, recently there has been a rapid increase in demand not only for the production of fine particles alone, but also for the atomizer itself made of the fine particles. Naturally, then, the density of the atomized body itself becomes a problem, and the need for adjusting these densities, especially for a trace amount of A adjustment with a lower density than conventional ones, has increased.

To give an example of such uses, fine particles in a low-density atomized body are scattered as single particles and adhered to a flat plate surface,
These are used as spacers to make liquid crystal panels and other flat plates.

The motivation for the present invention was to produce a fume of lower and desired density than in conventional liquid or melt spray versus hard plate impingement schemes.

[Means for solving problems]

As mentioned above, when spraying liquid or melt from a spray nozzle, it is essential to apply pressure above a certain limit to them or to the spraying gas.

The inventors of the present invention have noticed that the only way to reduce the number of ejections, that is, to lower the density of the atomized material while maintaining these requirements, is to perform the ejection intermittently.

The gist of the present invention is to spray jets from a spray nozzle intermittently at necessary time intervals in a liquid or molten spray-to-hard plate collision method, and thereby to reduce the density of the fumes produced. This is a method and apparatus for lowering TAm.

First, the method of the present invention will be explained. Refer to FIG. 1, the liquid (L) or the melt (hereinafter, the term "melt" will be omitted as it includes the melt) is passed through the spray gun (3) and into the spray nozzle ( 2) spray intermittently under a certain required timing, impinging the spray stream (sp) on the surface (4) of the hard material, thereby causing the particles in the spray stream (sp) to
P) is crushed and finely divided into fine particles (Ps), and the density of the atomized body (A s ) consisting of these fine particles (Ps) is
This is a method of adjusting within a lower range.

The above intermittent time interval is based on an electric signal from a timer (8), etc., and the automatic opening/closing valve (7) in the spray gun (3) that receives the signal is a solenoid type (6).
).

Note that the solenoid type may be a pneumatic type, and the electrical signal from the timer may be converted to the pneumatic type.

Next, the effectiveness of the above-mentioned intermittent spray will be explained.

When the automatic opening/closing valve (7) is closed, the amount of liquid ejected is zero, and when it is closed, the liquid is ejected for that period of time.In this way, the amount of liquid ejected intermittently is zero. If you integrate the amount within a certain unit time, you will naturally get a smaller amount than if it were ejected continuously.And these intermittent time intervals should be cyclical and as small as possible. Often, the cycle is several IO to several 100 degrees per second, and the intermittent time is preferably in milliseconds. For example, see Figure 2A, the density of the atomized body obtained when ejected continuously is three-fifths. If you want to dilute the density of the fumes generated during the spraying process, you can spray intermittently, with the spray "open" for 12 m and the spray closed for 8 Ils, in 50 cycles, or one cycle of 20 m (milliseconds). , and when you want to dilute it to 50%, open the spray as shown in Figure 2B.
4 m and 'closed' to 15 m. These intermittent times and cycles can be easily and arbitrarily set by using a pulse controller.

The above spray may be a two-fluid spray or an airless spray, but in the former case, the spray gas (A) is in the chamber (1).
is continuously fed into the chamber (1), so that its volume forces the generated fumes out of the chamber (1). However, in the latter case, the volume of fine particles atomized from the liquid by spraying is extremely small, so it is desirable to separately introduce gas (G) into the chamber.

Next, the structure of the device of the present invention will be explained. First, let's take up the basic structure. Please refer to FIG. 3, which shows a horizontal version of the chamber. Chamber (11)
A spray nozzle (12) is provided downward from the top. The spray nozzle is a solenoid (9) valve (10) or a gun (1) with an air-operated automatic opening/closing valve.
3), and both of these solenoids (9) are electrically connected to a timer (8). Practically speaking, it is more desirable to use a pulse controller as described above than the timer.

The following is almost the same as the conventional spray-to-hard plate collision type device, but to explain them for reference, below the above-mentioned spray nozzle (12) there is a The hard material surface (14) is attached facing upward at a certain required distance +1 (S). These distances m (S) are.

It varies depending on the type of spray nozzle, the type of liquid being handled, the size of the fine particles generated, their amount, etc.

It is said that most of them are in the range of about 70an to 300m.

The lower end of the chamber (11) is connected to a tank (19) as a pipe (18) as a discharge port or return port (17). Further, the upper part of the chamber (11) is connected to a horizontal duct (16), and the end thereof is opened downward (16M).
)are doing.

As for the spraying methods for the spray gun (13) and spray nozzle (12) in the same figure, a two-fluid spray device is shown by a solid line, and an airless spray device is shown by a phantom line. All of them are the same as conventional ones, but to explain them for reference, the piping (21) of the liquid supply device (20) is connected to the tank (19).
) through the regulator (22), heater (48), etc., and the pipe of the spray gas supply device '11 (23) (
24) is connected to the regulator (25) from the gas generator (CA).
).

The above-mentioned play gun (13) is connected via the heater (59) etc.
The pipes (57, 58) are connected to.

In addition, in the case of airless spray equipment rrL (26), the pump (28) is connected to the tank (19) by piping (27).
Heater (49), filter (29), regulator (4
7), etc., to the spray gun (13), and via a return pipe (18) from the return port (17) at the lower end of the chamber (11) of the main body.

Piping is connected to the tank (19) via a stop valve or the like. In addition, in the case of the above-mentioned airless spray device, it is desirable to have a circulation circuit, and the above-mentioned spray gun (
Circulating circuit piping (60) from 13) is provided. Further, on the side wall of the chamber (11) and below the hard material surface (14) inside thereof, there is a gas inlet (15) from the outside.
may be provided. The opening is a gas introduction device ffl (
50) i.e. gas pumping machine (52), regulator (56)
, heater (55), filter (54), flow meter (53)
Piping (51) is connected through the pipes, etc.

Note that it is desirable that the hard material of the above-mentioned conventional structure be made of a liquid-repellent material, or that the surface of the general hard material be coated with a liquid-repellent agent.

[For production]

The solenoid (9) in the spray gun (13) according to the present invention is intermittently operated by a timer (8) or a pulse controller or other fine intermittent electric signals at regular intervals, and the solenoid valve (10) is also activated accordingly. It opens and closes intermittently. For two-fluid sprays,
As shown by the solid line in Figure 3, the spray gas in the two-fluid spray device is supplied to the spray gun (1
3) is intermittently opened and closed by the solenoid valve (10), and the liquid (L) in the tank (19) rises in the pipe (21) and sprays the spray gun (
13), and is intermittently sprayed from the spray nozzle (12). In the case of the airless spray device e (26), the liquid pressurized to a certain pressure by the pump (28) is sent to the heater (49) and the filter (29).
).

Spray gun (1) via regulator (47) etc.
3), the liquid is intermittently sprayed by opening and closing the liquid solenoid valve intermittently. As mentioned above, the pressurized liquid that has become stuck in the spray gun is returned to the inlet of the pump (28) through the circulation line (60) to be resupplied or recycled. It is.

It is desirable that the intermittent ejection time as described above be periodic and small increments, and in practice it is best to use pulse signals in milliseconds, and these pulse signals should be in milliseconds and As mentioned above, it is most desirable to use a pulse controller that can arbitrarily set one signal. Specific explanations of these can be found in the previous section [
As mentioned in the method section of ``Means for Solving Problems''.

It is omitted in this section.

When the amount of liquid ejected is adjusted in this way, those amounts of liquid are simultaneously sprayed, and the I-formed fine particles hit the surface (14) of the hard material and are crushed to form a fume consisting of finely divided fine particles. is generated, but as explained in the above method section, the density of these atomized bodies depends on the above-mentioned IA adjustment of the ejection amount.

In this way, the density of a vapor consisting of fine particles of liquid or melt can be produced at a lower and arbitrary value.

〔Example〕

That l.

In the basic structure of the device of the present invention described above, the chamber is horizontal as shown in FIG. This is an example. In the case of a vertical shape, the generated smoke body moves upward. At this time, due to the speed and gravity, relatively heavy particles settle downward, and relatively light particles float upward. Therefore, by collecting the ig and diluent floating upward, it is possible to obtain a vapor consisting only of smaller particles.

2. In the above-mentioned basic structure, the hard material surface (14) faces upward, and the spray nozzle (12) facing the surface b faces downward, as shown in FIG. Ta. However, when the nucleus is directed upward, there are the following drawbacks.

Please refer to FIG. 9 and FIG. 1O.

On the upper surface of the core, the sprayed liquid is piled up, that is, a liquid product N (LΩ) is created.The feature of the spray-to-hard plate collision type device is that the sprayed liquid particles are hit against a hard surface and crushed. The goal is to make the material even finer. However, when the liquid flows MW (Lll) onto the hard plate surface, the hardness of that surface becomes the same as that of the liquid, that is, it decreases. Therefore, the degree of refinement decreases, the grain size becomes coarser, and changes over time. This is inappropriate when fine particles with uniform particle size are required.

To prevent this, it is best to always prevent liquid from adhering to the core, but it is difficult to do this perfectly, so it is best to try to minimize the amount of liquid adhering to the core as much as possible. However, as shown in FIG. 5, by mounting the hard material with the surface facing downward (84) and the opposing spray nozzle facing upward (82), the liquid deposited on the downward facing surface can be removed. The amount of liquid that falls downward due to its own weight and adheres to the surface is always small, so the thickness of the liquid adhesion layer is thin, and a significant decrease in the hardness of the hard material surface is avoided. However, this only applies if the liquid has a low viscosity.

If it is high, there is no need to expect much, and the surface of the hard material mentioned above should be coated with a liquid repellent material (a material that has the effect of repelling the liquid to be handled, such as Teflon material or silicone material), or these materials should be coated. If you make a hard material with it, you can repel liquids and reduce the amount of them attached. However, it cannot be avoided that the wear and tear caused by spray hitting is greater than that of metal.

3. In this embodiment, as shown in Fig. 6, the hard material surface is directed diagonally upward (94), and the corresponding nozzle is directed diagonally downward (92). Department (94)
The liquid adhering to the top is made to flow down along the slope,
6. Part 2 above aims to reduce the amount of liquid that adheres to the surface. In the example in
Although the nozzle was directed upward, the disadvantages in that case can be overcome in one example.

4. In this embodiment, as shown in Fig. 7, the surface of the hard material is erected (1
04), and the opposing spray nozzle is oriented horizontally (102). It can be said that the advantages and disadvantages of the embodiments 3 and 3 are complementary to each other.

5. As shown in FIG. 8, this embodiment has the surface of the hard material facing diagonally downward (114) and the corresponding nozzle facing diagonally upward (112). Each side of the above has its own patent, but at the same time the installation of this device 411
The structure, hard material surface, and nozzle mounting are determined by the location and other factors.

〔effect〕

According to the method and apparatus of the present invention, a method and apparatus for impinging a spray of liquid or molten material on the surface of a hard material to fragment the particles thereof, By intermittently spraying with a pulse signal, the density of the generated smoke can be adjusted, and a desired lower density can be obtained extremely easily by operating a dial on the pulse controller or the like. be.

[Brief explanation of the drawing]

FIG. 1 is a detailed illustration of the present invention. FIGS. 2A and 2B are graphs of exemplary intermittent spray times according to the method of the present invention. FIG. 3 is a side sectional view of the structure of the apparatus of the present invention. FIG. This is the first embodiment of the device of the present invention. Figure 5 is a side sectional view of the structure of Figure 2. Figure 6 is a side sectional view of the structure of Figure 3. Figure 7 is a side sectional view of the structure of Figure 4.
The side cross section of Nomo 1-zukuri in Figure 8 is also shown in Figure 5. Figure 9 is a side sectional view of the structure of the conventional liquid spray-to-hard plate collision type device. Figure 10 is an explanatory diagram of the layered state of the liquid sprayed on the hard plate surface. Explanation of the main symbols.

Claims (1)

[Claims] (1) Spray (SP) the liquid (L) or melt (M) from the two-fluid spray nozzle (2), and hit the spray onto the surface (4) of the hard material. A fume consisting of fine particles of a liquid or molten substance, characterized in that the method of obtaining such fine particles by means of a liquid or molten liquid is intermittently sprayed at a certain required time interval to produce a fume having the required density. How to adjust body density. (2) A method for adjusting the density in the production of a vapor consisting of fine particles of liquid or melt according to claim 1, wherein the two-fluid spray is an airless spray. (3) A method for adjusting the density of a vapor consisting of fine particles of a liquid or melt as claimed in claim 1, wherein the adjustment is performed at required time intervals by electrical pulse signals. (4) Spraying (SP) of liquid (L) or melt (M)
A particle manufacturing device for obtaining particles by hitting a hard material surface (14) with the following features: a. A horizontal spray chamber (11) is provided, and b. In the chamber (11) there are two A fluid spray nozzle (12) is provided; c. Below the two-fluid spray nozzle (12),
a hard material surface (14) is provided upwardly opposite the two-fluid spray nozzle at a certain required distance (S); d. the two-fluid spray nozzle (12) comprises: connected to a two-fluid spray gun (13) with a solenoid (9) type on-off valve (10); e. said solenoid (9) electrically connected to a timer (8); f. said chamber. (11) A liquid or melt discharge port (17) is provided at the lower end, and g. A duct (16) that opens to the outside is provided at the upper part of the chamber (11). 1. A device for adjusting the density of a vapor consisting of fine particles of liquid or melt, characterized in that it consists of: (5) Horizontal chamber (
5. The device for adjusting the density of a vapor made of fine particles of liquid or melt according to claim 4, wherein 11) is a vertical chamber (71). (6) The device for adjusting the density of a vapor made of fine particles of liquid or melt according to claim 4, wherein the two-fluid spray is an airless spray. (7) The solenoid (9) type on-off valve (10) is an air-operated automatic on-off valve, and at the same time, the air operation part is electrically connected to the timer (8) via a pneumatic conversion device. A device for adjusting the density of a vapor consisting of fine particles of a liquid or melt according to claim 4. (8) A device for adjusting the density of a vapor made of fine particles of liquid or melt according to claims 4 and 7, wherein the timer (8) is a pulse controller. (9) The liquid or molten material according to claim 4, wherein the hard material is made of a liquid repellent material or is a general hard material whose surface is coated with a liquid repellent material. A device for adjusting the density of atomized particles made of fine particles. (10) The liquid or melt according to claim 4, characterized in that the surface of the hard material is directed downward (84), and the spray nozzle is provided opposite thereto to face the upper blade (82). A device for adjusting the density of atomized body particles. (11) The surface of the hard material faces diagonally upward (94) and the spray nozzle faces diagonally downward (92)
5. A device for adjusting the density of a vapor made of fine particles of liquid or melt according to claim 4. (12) The liquid or melt according to claim 4, characterized in that the surface of the hard material is provided in the lateral direction (104) and, in opposition thereto, the spray nozzle is also provided in the lateral direction (102). A device for adjusting the density of a vapor consisting of fine particles. (13) The liquid or melt according to claim 4, wherein the surface of the hard material is oriented diagonally downward (114) and the spray nozzle is provided diagonally upward in opposition thereto. A device for adjusting the density of a vapor formed of fine particles.