JPS58163466A - Method for granulating liquid into fine particle having uniform size and apparatus for its execution - Google Patents

Abstract

PURPOSE:To make a large quantity of the group of fine liquid drops having a uniform particle size, by forcedly supplying a liquid to a structural body in which the group of fine small holes having a uniform size are engraved to form the group of lquid columns, and applying vibration and voltage to them. CONSTITUTION:Using the technique of precise working such as laser or electron beam working, a liquid having passed through a pressurizing means 17 and a filter 16 is let flow through the inflow openings of parts and formed into the group of liquid columns under a stationary condition from the engraved part of a plate engraved with uniform size. Waves formed by vibrating a vibrating body 9 with an AC signal formed by an oscillator 15 and amplified by an amplifier 19 are transmitted to the liquid columns. On the other hand, voltage from a DC power source 18 is applied to the parts, so that static electricity is induced at the parts. By the actions of both of them, the group of the liquid columns are formed into the group 20 of fine particles having uniform size.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention utilizes laser processing technology, electron beam processing technology, or microprocessing technology such as chemical etching and plating to drill a group of uniform diameter micro holes in a part of a structure. A pressurized liquid is supplied to the structure, and a liquid column with a uniform micro diameter is generated from the perforation group, and ultrasonic high frequency vibration and DC voltage are superimposedly applied to this liquid column to generate a micro liquid with a uniform diameter. A method and apparatus for generating and producing droplets in large quantities. The invention further relates to the generation and production of solid particles of uniform diameter by applying the atomization method to a solution containing a solvent and spray drying it.

Now, if we consider the method of atomizing liquid from an industrial and industrial perspective, the production of large quantities of homogeneous and light particles will improve the efficiency of spray equipment, the combustion efficiency of liquid fuel burners, and the associated miniaturization of equipment. It has great industrial significance, such as homogenization of products and miniaturization of equipment in the production of uniform solid particles by spray drying.

By the way, conventional atomization methods include a method in which high-pressure liquid is discharged from a nozzle, a method using a binary nozzle in which a gas flow is mixed with a liquid flow, and a method in which a high voltage is applied to a liquid flow from a nozzle. However, it is not possible to obtain a group of fine particles having a uniform diameter. Furthermore, methods using ultrasonic high-frequency vibrations are not used industrially because they cannot produce a large amount of fine particles that can be used industrially.

However, in recent years, precision machining techniques such as laser machining technology, electron beam machining technology, chemical etching, plating, etc. have advanced, and it has become possible to drill a large number of microscopic holes in a microscopic area. By using the above-mentioned advanced technology developed in recent years, a large number of uniform diameter micro holes are automatically drilled, a large number of uniform-light micro liquid flow columns are generated, and high frequency vibration is applied to this liquid flow column. This is a method of generating and manufacturing a large number of uniform diameter micro droplets by superimposing and applying direct current voltage.

Next, to explain in detail the effect of the superimposed application of high-frequency vibration and DC voltage, it is found that atomization of uniform diameter by high-frequency vibration alone is suitable for atomization of minute diameters due to the limitation of amplitude, but it is difficult to atomize particles. Atomization of liquid flow columns with relatively large diameters that require amplitude is difficult and often does not atomize. Even if the amplitude can be increased, the uniformity of the generated particle group is often lost. As a method to overcome these disadvantages, a conductive plate is superimposed on the perforated plate via a non-conductive and dielectric material, and a DC voltage is applied to the perforated plate to generate electrically induced static electricity in the perforated plate. bring about

By fully superimposing this method, liquid columns with a relatively large diameter, liquid columns that are not completely atomized due to small vibration amplitude, or atomization in different liquids can be effectively atomized with a uniform diameter. can be done. Furthermore, the necessary applied voltage is sufficient to directly induce static electricity on the perforated plate that is in contact with the liquid,
Unlike conventional high-voltage atomization methods, a daytime voltage of several kilovolts is not necessary, and a low voltage is sufficient. In some cases, a voltage of several tens of volts or less is sufficient, and the low voltage has the advantage of ensuring safety and can be handled with the same ease as conventional nozzles. It is also possible to control the characteristics of the generated particles by separately adjusting the vibration and the applied voltage.

A detailed explanation will be given below with reference to specific examples shown in the attached drawings.

FIG. 1 shows a detailed cross-sectional view of the main body of the apparatus for generating uniform diameter fine particles. Furthermore, an exploded view of the assembly is shown in FIG.

Regarding the components of the main body, the vibrating body 9 is a part that vibrates in response to AC electric signals sent from an oscillator 15 and an amplifier 19, and is made of ferrite or viezo electric ceramics. The vibrating body 9 needs to be firmly connected by bonding, bolting, or the like so that vibrations are transmitted to the component 8. Further, the vibrating body 9 is connected coaxially to the component 8 or perpendicularly to the axis.

Liquid A, which has been pressurized to a constant pressure by a pump 17 and passed through a filter 16, is introduced into the inlet 5 of the component 8. The introduced liquid partially cleans the inner wall of the gap before starting operation, and is then discharged from the outlet lower together with the gas in the gap.

The component 1 is a plate in which a large number of holes 23 of uniform diameter are partially punched. In the embodiment, a hole is punched in the center of the disk. The component 14 is a ring-shaped packing whose inner diameter is larger than the cylindrical groove 13 to eliminate the gap between the components 1 and 8. If airtightness can be maintained by adhesion or the like, the component 14 is unnecessary. Furthermore, parts 1 and 8 must be brought into close contact with each other to ensure sufficient vibration transmission. The component 3 is a plate made of a conductive material such as metal, and is connected to a DC power source 18. Also part 3
is sandwiched between very thin plates 4 of non-conductive and dielectric material,
Alternatively, it must be coated and insulated from other parts such as part 10 and part 1 and the liquid.

One part 10 is a cover-like part for bringing 1 part 41 part 12 part 142 part 8 into close contact, and part 8 and part 1
0 is tightened with bolts, screws, etc.

Alternatively, it is sufficient for these parts to be airtightly bonded by strong adhesive. Part 11 is a cover for mixing the generated uniform diameter fine particles with gas C, and gas inlet 12
I have wo. Parts 11, 10.3, 4.

In each case, a hole of a size equal to or larger than the diameter of the cylindrical hole 13 of the part 8 is coaxially drilled, and the part 1
It must be ensured that the formation of the liquid flow column generated in On the other hand, the size of the perforated portion 2 of the component 1 in which a large number of holes 23 of uniform diameter are perforated is preferably equal to or smaller than the size of the holes 13.

Next, FIG. 5 shows a flow diagram of the entire generator.

Part 5 of the main body includes a filter 16. A liquid pressurizing device 17 (and a flow meter 24) is connected. It is also a single process to incorporate the filter 16 into the main body. Further, an AC signal amplification amplifier 19 and an oscillator 15 are connected to the vibrating body 9.

A DC power supply 18 is connected to the component 3. A gas pump or the like 26 for supplying gas is connected to the component 12 . It is also preferable to ground the main body.

The perforated portion 2 of the uniform diameter perforated plate of part 1 is 1゛
As a typical example, concentric circles (area surrounded by broken lines) as shown in Figure 3a are shown, but it is sufficient that part 1 has a group of perforations with a uniform diameter in some parts. The following forms are possible. For example, it may be annular as shown in FIG. 3B, or divided into blocks as shown in C. In this case, however, the hole diameters of the parts 13, 14, 3.4.10.11 must also be adapted appropriately to the configuration. Note that FIG. 4 is an enlarged view of the perforated portion 2.

To describe the operation, the liquid is pressurized by the pressurizing device 17, passes through the filter 16't-, and flows into the main body from the inlet of the component 5. Before starting operation, the liquid is partially discharged from the liquid delivery lower for internal cleaning and discharge of accumulated gas. The liquid draining lower part is closed, and when a certain pressure is reached, the uniform diameter perforation plate 1
The liquid flows out from the perforation portion 2 as a group of liquid columns in a steady state. In this state, an alternating current signal generated by the oscillator 15 and amplified by the amplifier 19 causes the vibrating body 9 to vibrate at the same frequency as the signal, and the vibration is transmitted to the entire body. On the other hand, DC power supply 1
8, a voltage is applied to component 3, and static electricity is applied to component 1 and component 2. Due to the applied vibrations and dielectricity, the liquid column is dispersed into a uniform diameter particle group 20. Further, the characteristics of the uniform diameter fine particle group 20 can be controlled by adjusting the applied vibration and voltage. In this case, the dried residue forms solid particles and flows out of the component 621. .

Since the generated particles of uniform diameter are often electrically bound, they can be collected in a specific location using electric force. Also, in order to eliminate the
5, a gas charged with static electricity may be introduced.

Examples will be briefly explained.

Approximately 3000 perforated perforated plates with uniform diameter of each hole from 10 microns to 100 microns are used to produce suitable frequencies corresponding to the hole diameters from 1 kilohertz to 200 kilohertz. The hole diameter V
``Almost uniform particle groups τ were generated, and a large amount of particles could be produced at a rate of several hours per minute. Similarly, the present invention is not limited to the embodiments described above, but includes any and all modifications within the scope of the present invention.

[Brief explanation of the drawing]

11. It is a sectional view of the main body of the generating part of the 11th uniform light particle group generator/), and FIG. 2 is an exploded view of the assembly.
Figure 3 shows an example of the uniform diameter perforated plate in the form of b, f). Figure 5 is an enlarged view of the uniform diameter perforation section 2. Figure 5 is a flowchart of the entire generator.
Uniform diameter pair hole plate 3...Electric sweat stamp +111 use 9.
... Vibrating body 15 ... AC Shinshin oscillator 16
...Filter 17...Static pressure ++4 Bo:
/-718...DC power supply 22...Uniform diameter R grain +-[T'23...Uniform-C'-Hea A,, (t
.

Claims (3)

[Claims] (1) Using processing techniques such as laser beam machining, electron beam machining, chemical etching, plating, etc., a large number of uniformly diameter microholes are drilled into a thin plate, and a non-conductive and A liquid is allowed to flow out from the group of uniform diameter micro-holes into a pressure vessel-like structure made up of a polymerized conductive plate insulated from others via a dielectric thin plate or film, The present invention is characterized in that, at the same time as generating uniform light micro liquid columns, high-frequency vibrations are applied to the entire pressure vessel-like structure or the perforated portion, and a voltage is applied to the conductive plate in a superimposed manner. A method for atomizing liquid to uniform diameter particles. (2) A method for generating uniform-diameter solid particles by spray-drying a solution containing a solvent using the method set forth in claim 1. (3) Apparatus for carrying out the method set forth in claim 1