WO2003002263A1

WO2003002263A1 - Ultra-fine particulate generating device

Info

Publication number: WO2003002263A1
Application number: PCT/JP2002/006413
Authority: WO
Inventors: Masaaki Ikeda
Original assignee: Atomax Co., Ltd.
Priority date: 2001-06-29
Filing date: 2002-06-26
Publication date: 2003-01-09
Also published as: JP4647845B2; JP2003010741A

Abstract

An ultra-fine particulate generating device (2) capable of generating ultra-fine particulates having a uniform particle size, comprising a particulate generating nozzle (12) for generating liquid particulates by crushingly atomizing liquid by gas, a sorting container (10) for sorting the particulates generated by the particulate generating nozzle, and a discharge part (28) for discharging the ultra-fine particulates sorted from the particulates in the sorting container (10), the sorting container (10) further comprising a streamlining member (14) for leading the particulates generated by the particulate generating nozzle to the lower part of the sorting container and particulate screening plates (20), (22), and (24) for sorting the particulates by suppressing the floating of the particulates led to the lower part of the sorting container by the streamlining member.

Description

Specification

Technical field

TECHNICAL FIELD The present invention relates to an ultrafine particle generator for generating ultrafine particles of liquid such as water, chemicals, oils, resins, and solvents. Background art

Conventionally, there have been known methods for generating ultrafine particles of a liquid, such as a method of crushing and miniaturizing a very small amount of liquid with a large amount of gas, a method of obtaining fine particles using heat evaporation, and a method of obtaining fine particles by ultrasonic vibration. Have been. Here, there is an ultra-fine particle generator using a method of crushing and miniaturizing a very small amount of liquid with a large amount of gas using a two-fluid nozzle for crushing and miniaturizing liquid with gas. In this two-fluid nozzle, a liquid such as water or a chemical solution is ejected from a liquid ejection portion at the tip of the nozzle, and a gas such as air is ejected from a gas ejection portion provided around the liquid ejection portion. DISCLOSURE OF THE INVENTION DISCLOSURE OF THE INVENTION A liquid is mixed and jetted, and the liquid is crushed and refined by a gas to obtain liquid fine particles

However, it is difficult to obtain fine particles having a uniform particle size of 5 μπι or less in the method of crushing and refining a liquid with a gas to obtain fine particles of the liquid. However, the difference between the minimum particle sizes increases. That is, Fig. 8 shows the case where fine water particles are generated using a conventional two-fluid nozzle (the pressure of the gas supplied to the two-fluid nozzle: 0.5 MPa, the liquid supplied to the two-fluid nozzle). (Amount: 10 ml / min) is a graph showing the particle diameter and the abundance ratio. As shown in this figure, the particle diameter of the generated fine particles is distributed in a certain range.

An object of the present invention is to provide an ultrafine particle generator capable of generating ultrafine particles having a uniform particle diameter. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic configuration diagram of an ultrafine particle generator according to an embodiment of the present invention.

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FIG. 2 is a diagram illustrating a particle sorting plate according to an embodiment of the present invention. _C FIG. 3 is a diagram illustrating a particle sorting plate according to an embodiment of the present invention. C FIG. FIG. 5 is a diagram showing a particle sorting plate according to an embodiment of the present invention. FIG. 5 is a diagram for explaining a configuration for supplying electric charges to a discharge unit in the embodiment of the present invention.

FIG. 6 is a diagram showing the measurement results of the particle diameter of the ultrafine particles generated by the ultrafine particle generator according to the embodiment of the present invention and the abundance ratio for each particle diameter.

FIG. 7 is a diagram showing the measurement results of the particle diameter and the existence ratio of the particle diameter の of the ultrafine particles generated by the ultrafine particle generator according to the embodiment of the present invention.

FIG. 8 is a diagram showing the measurement results of the particle diameter of the ultrafine particles generated by the two-fluid nozzle and the existence ratio for each particle diameter. BEST MODE FOR CARRYING OUT THE INVENTION

The ultra-fine particle generating device according to claim 1, wherein a fine particle generating nozzle that crushes and atomizes the liquid with a gas to generate liquid fine particles, a separation container that separates the fine particles generated by the fine particle generating nozzle, A discharge unit configured to discharge ultrafine particles separated from the fine particles in the separation container, wherein the separation container is configured to discharge the fine particles generated by the fine particle generation nozzle into a lower part of the separation container. A rectifying member that guides the particles to the lower part of the separation container by the rectifying member, and a particle sorting plate that sorts the particles by suppressing the floating of the particles.

Further, in the ultrafine particle generator according to claim 2, a plurality of the fine particle sorting plates provided with a plurality of fine particle passage holes through which the fine particles pass are disposed in the separation container, and are located on a lower side. The size of the fine particle passing holes provided in the fine particle sorting plate is the same as the size of the fine particle passing holes provided in the upper fine particle sorting plate. It is characterized by being larger than the size of.

The ultrafine particle generating device according to claim 3, further comprising a secondary gas supply unit that supplies a secondary gas for raising the fine particles in the separation container into the separation container. .

According to the ultrafine particle generator according to claims 1 to 3, the fine particles generated by the fine particle generation nozzle are guided to the lower part of the separation container by the rectifying member. The fine particles guided to the lower part of the sorting container are gradually floated in the separating container through a plurality of fine-particle passage holes provided in the fine particle sorting plate, while the floating is suppressed by the fine particle sorting plate. During this time, the fine particles having a large particle diameter fall to the bottom of the separation vessel, and ultrafine particles having a uniform particle diameter are discharged from the discharge part.

Further, the ultrafine particle generating device according to claim 4 is a liquid amount adjusting means for adjusting an amount of a liquid supplied to the fine particle generating nozzle, and a pressure of a gas supplied to the fine particle generating nozzle. Nozzle supply gas pressure adjustment means, and secondary gas pressure adjustment means for adjusting the pressure of the secondary gas supplied into the separation container, wherein the amount of the liquid supplied to the fine particle generation nozzle and the gas The amount and the particle diameter of the ultrafine particles discharged from the discharge unit are controlled by adjusting the pressure and the pressure of the secondary gas supplied into the separation container.

According to the ultrafine particle generation device described in claim 4, the amount of the liquid supplied to the fine particle generation nozzle and the pressure of the gas are adjusted, and the pressure of the secondary gas supplied into the separation container is adjusted. By doing so, a desired amount of ultrafine particles can be discharged from the discharge section, and ultrafine particles having a desired particle diameter can be discharged from the discharge section.

The ultrafine particle generating device according to claim 5, further comprising a charge supply unit that supplies electric charges to the ultrafine particles discharged from the discharge unit. According to the ultrafine particle generator according to the fifth aspect, the ultrafine particles discharged from the discharge unit can be charged by supplying a charge. Therefore, the efficiency of attachment to the object to be sprayed or applied can be improved.

Hereinafter, an ultrafine particle generator according to an embodiment of the present invention will be described with reference to the drawings. Will be described.

FIG. 1 is a configuration diagram of an ultrafine particle generator according to an embodiment of the present invention. The ultrafine particle generator 2 includes a cylindrical fine particle separation container 10 having a closed lower end and a lid 10a at the upper end. A two-fluid nozzle (particle generation nozzle) 12 that crushes and refines the liquid with a gas is provided in the lid 10a of the particle separation container 10. Here, the two-fluid nozzle 12 ejects gas from the gas ejection port to the outer periphery of the liquid ejected from the liquid ejection port provided at the tip of the nozzle, and crushes and refines the liquid with the gas. It ejects liquid fine particles.

A rectifying cone (rectifying member) 14 for rectifying and guiding the fine particles generated by the two-fluid nozzle 12 to the lower portion of the fine particle separating container 10 is provided in the fine particle separation container 10. Here, the tip of the two-fluid nozzle 12 is disposed in the upper opening of the rectifying cone 14. A secondary gas supply pipe 18 extending from the secondary gas compressor 16 is disposed in the fine particle separation container 10. The secondary gas from the secondary gas compressor 16 is supplied to the rectifying cone 1. Supplied near the lower opening of 4. Also, inside the particle separation container 10, a rectifying cone 14 suppresses the floating of the particles guided to the lower part of the particle separation container 10, and sorts the particles. 22 and 24 are provided.

As shown in FIG. 2, the particle sorting plate 20 is a disk-shaped plate member provided with an opening 20a through which a rectifying cone 14 penetrates in the center, and has a large number of particle passing holes. 2 Ob is provided. Further, as shown in FIG. 3, the particle sorting plate 22 is a plate-shaped member having a disk shape provided with an opening 22 a through which a rectifying cone 14 penetrates in the center, and a large number of particles passing therethrough. A hole 22b is provided. The fine particle passing holes 22b are formed to be larger than the fine particle passing holes 20b of the fine particle sorting plate 20. Further, as shown in FIG. 4, the fine particle selection plate 24 is a disk-shaped plate member provided with an opening 24 a through which the rectifying cone 14 penetrates in the center, and a large number of fine particles passing therethrough. A hole 24b is provided. The fine-particle passing hole 24 b is formed to be larger than the fine-particle passing hole 22 b of the fine-particle sorting plate 22. A liquid outlet 10 b communicating with the liquid storage container 26 is provided at the bottom of the fine particle separation container 10. The liquid accumulated at the bottom of the fine particle separation container 10 is discharged from the liquid discharge port 1 Ob and stored in the liquid storage container 26.

The lid 10 a of the particle sorting container 10 is provided with a discharge unit 28 for discharging ultrafine particles separated from the particles in the particle separation container 10. Here, the discharge section 28 is composed of a spray port mounting section 28 a attached to the lid section 10 a of the fine particle separation container 10, a spray guide pipe 28 b connected to the spray port mounting section 28 a, and a spray. It is constituted by a spray port 28 c provided at the tip of the guide tube 28.

A liquid supply pipe 30 for supplying liquid to the two-fluid nozzle 12 is provided between the liquid storage container 26 and the two-fluid nozzle 12. The liquid supply pipe 30 is provided with a needle valve 32 for adjusting the amount of liquid supplied to the two-fluid nozzle 12. In addition, liquid can be supplied to the two-fluid nozzle 12 from other than the liquid storage container 26 via the branch supply pipe 30a. A gas supply pipe 36 for supplying nozzle gas to the two-fluid nozzle 12 is provided between the nozzle supply compressor 34 and the two-fluid nozzle 12.

Next, processing for generating ultrafine particles by the ultrafine particle generator 2 will be described. In the following description, an example will be described in which ice is supplied to the two-fluid nozzle 12 and air is supplied as the nozzle gas and the secondary gas.

In the ultrafine particle generator 2, when air (nozzle gas) is supplied from the nozzle supply compressor 34 to the two-fluid nozzle 12 via the gas supply pipe 36, the air is supplied to the two-fluid nozzle 12 The water in the liquid storage container 26 is sucked up by this jetting power and supplied to the two-fluid nozzle 12 through the liquid supply pipe 30.

In the two-fluid nozzle 12, water spouted from the liquid spout is crushed and refined by air spouted from the gas spout, and water fine particles are spouted. The fine particles of water jetted from the two-fluid nozzle 12 are guided to the lower part of the fine particle separation vessel 10 through the flow straightening cone 1 and within the scope of claim 4. On the other hand, air (secondary gas) from the secondary gas compressor 16 passes through the secondary gas supply pipe 18 to open the lower part of the rectifying cone 14. Supplied near the mouth.

The fine particles guided to the lower part of the fine particle separation container 10 are separated by fine particles sorting plates 20, 22, 2 by the air (nozzle gas) ejected from the two-fluid nozzle 12 and the upward flow by the secondary gas. While the levitation is suppressed by 4, it gradually passes through the fine particle passage holes 20 b, 22 b, 24 b provided in the fine particle sorting plates 20, 22, 24, and gradually enters the fine particle separation container 10. Surface. That is, first, the fine particles that have passed through the fine particle sorting plate 24 are prevented from floating by the fine particle sorting plate 22, and fine particles having a predetermined particle diameter stay between the fine particle sorting plate 24 and the fine particle sorting plate 22. I do. Here, the fine particles having a large particle diameter fall to the bottom of the fine particle sorting container 10 by gravity.

Further, the floating of the fine particles passing through the fine particle sorting plate 22 is suppressed by the fine particle sorting plate 20, and fine particles having a predetermined particle diameter stay between the fine particle sorting plate 22 and the fine particle sorting plate 20. Here, the fine particles having a large particle diameter fall to the bottom of the fine particle separation container 10 by gravity. The particle diameter of the fine particles staying between the fine particle sorting plate 22 and the fine particle sorting plate 20 is smaller than that of the fine particles staying between the fine particle sorting plate 24 and the fine particle sorting plate 22. I'm wearing

As the fine particles float in the fine particle separation container 10 in this manner, the fine particles having a large particle diameter fall to the bottom of the fine particle separation container 10, and only the ultrafine particles having a uniform particle diameter are removed from the fine particle separation container 10. It is discharged from the discharge part 28 of 0. The water accumulated at the bottom of the fine particle separator 10 is discharged from the liquid outlet 1 Ob, stored in the liquid storage container 26, and reused.

In the ultrafine particle generator 2, when the particle diameter of the ultrafine particles to be generated is changed, the pressure of the air (gas for nozzle) supplied to the two-fluid nozzle 12 and the pressure supplied to the fine particle separation container 10 are increased. Adjust the pressure of the secondary gas. That is, by controlling the nozzle supply compressor 34 to increase the pressure of the air (nozzle gas) supplied to the two-fluid nozzle 12, the particle diameter of the ultrafine particles discharged from the discharge unit 28 decreases. When the pressure of the air (nozzle gas) supplied to the two-fluid nozzle The particle diameter of the ultrafine particles discharged from the outlet 28 increases. That is, if the pressure of air (nozzle gas) supplied to the two-fluid nozzle 12 is increased, the particle diameter of the fine particles ejected from the two-fluid nozzle 12 becomes smaller. The particle diameter of the ultrafine particles discharged from 8 becomes smaller.

When the pressure of the air (secondary gas) supplied to the particle separation container 10 is increased by controlling the secondary gas compressor 16, the particle diameter of the ultrafine particles discharged from the discharge unit 28 decreases. On the other hand, when the pressure of the air (secondary gas) is reduced, the particle diameter of the ultrafine particles discharged from the discharge unit 28 increases. That is, when the pressure of the secondary gas is increased, the amount of fine particles passing through the fine particle passage holes 2 O b, 22 b, 24 b provided in the fine particle sorting plates 20, 22, 24 increases. Therefore, the fine particles having a large particle diameter are difficult to pass, and the fine particles having a small particle diameter pass through the fine particle passage holes 20b, 22b, 24b provided in the fine particle sorting plates 20, 22, 24. As a result, the diameter of the ultrafine particles discharged from the discharge section 28 of the ultrafine particle generator 2 becomes smaller. In addition, by adjusting the pressure of the secondary gas, the uniformity of the particle diameter of the ultrafine particles discharged from the discharge unit 28 can be increased.

Further, in order to increase the amount of ultrafine particles discharged from the discharge section 28 of the fine particle separation container 10, the dollar valve 32 provided in the liquid supply pipe 30 is adjusted. In other words, by adjusting the needle valve 32 to increase the amount of water supplied to the two-fluid nozzle 12, the amount of ultrafine particles discharged from the discharge portion 28 can be increased. By adjusting 32 and reducing the amount of water supplied to the two-fluid nozzle 12, the amount of ultrafine particles discharged from the discharge unit 28 can be reduced. According to the ultrafine particle generator 2 according to this embodiment, energy can be saved, that is, only air is supplied to the two-fluid nozzle 12 and air (secondary gas) is supplied into the particle separation container 10. Then, the fine particles are separated by the fine particle diameter (mass), whereby ultrafine water particles having a uniform particle diameter of 5 μπι or less can be generated. In addition, by adjusting the amount of water supplied to the two-fluid nozzle 12 and the pressure of air, and by adjusting the pressure of air (secondary gas) supplied into the fine particle separation container 10, a desired amount is obtained. The ultrafine particles having a desired particle diameter can be discharged from the discharge section 28. The child can be discharged from the discharge part 28.

In addition, since the ultrafine particle generator 2 can generate ultrafine particles having a uniform particle diameter, sterilization, insecticidal, deodorant, ultrathin coating, and manufacturing, which have required advanced technologies to date, are required. It can be used at low cost in fields that require ultrafine particles such as granules and combustion.

In addition, an electric charge may be supplied to the ultrafine particles discharged from the discharge unit 28 of the particle sorting container 10 of the above-described embodiment. That is, as shown in FIG. 5, a desired high DC voltage is supplied to the spray port 28 c of the discharge unit 28 by the power supply device 40, and electric charges are supplied to the ultrafine particles discharged from the discharge unit 28. Charge. By charging the ultra-fine particles in this way, the efficiency of the ultra-fine particle adhesion to the object to be sprayed or applied can be improved.

Further, in the ultra-fine particle generator of the above-described embodiment, water is supplied to the two-fluid nozzle to generate ultra-fine particles of water. Then, ultrafine particles such as chemicals, oils, solvents, and resins may be generated.

Next, the measurement results of the particle diameter of the ultrafine particles generated in the ultrafine particle generator 2 and the abundance ratio for each particle diameter are shown. Figure 6 shows that the pressure of air supplied to the two-fluid nozzle 12 is 0.3 MPa, the amount of liquid supplied to the two-fluid nozzle 12 is 1 Oml Zmin, and the FIG. 7 is a diagram showing the results of measuring the particle diameter of ultrafine particles generated by the ultrafine particle generator 2 and the abundance ratio by supplying a secondary gas (air) at a predetermined pressure. As shown in this figure, the ultrafine particles having a particle diameter of 3.9 to 5.9 μπι are 100%, and it can be confirmed that ultrafine particles having a uniform particle diameter can be generated. Was.

Fig. 7 shows that the pressure of air supplied to the two-fluid nozzle 12 is 0.5 MPa, the amount of liquid supplied to the two-fluid nozzle 12 is 10 ml / min, Inside, a secondary gas (air) at a predetermined pressure higher than that shown in Fig. 6 is supplied, and the particle size of the ultrafine particles generated by the ultrafine particle generator 2 and the result of measuring the abundance ratio are shown. FIG. The ultrafine particles generated as shown in this figure have a particle size of 1. The ratio was 86.1% for 92.7%, and it was confirmed that the particle diameter of the ultrafine particles could be reduced by increasing the pressure of the secondary gas. Industrial applicability

According to the present invention, the fine particles in the separation container are gradually floated in the separation container through the fine particle passage holes provided in the fine particle selection plate while the floating is suppressed by the fine particle selection plate. During this time, the fine particles having a large particle diameter fall to the bottom of the separation container, and the ultrafine particles having a uniform particle diameter are discharged from the discharge part.

In addition, by adjusting the amount of liquid supplied to the particle generation nozzle and the pressure of the gas, and by adjusting the pressure of the secondary gas supplied into the separation container, a desired amount of ultra-fine particles can be discharged from the discharge unit. In addition to discharging, ultrafine particles having a desired particle diameter can be discharged from the discharging unit.

In addition, since the ultrafine particles discharged from the discharge unit can be charged by supplying electric charges, the efficiency of adhesion to the object to be sprayed or applied can be improved.

Claims

The scope of the claims

1. A fine particle generating nozzle for crushing and atomizing the liquid with a gas to generate liquid fine particles, a separating container for separating the fine particles generated by the fine particle generating nozzle, and an ultrafine particle separated from the fine particles in the separating container. An ultra-fine particle generating device comprising a discharge unit for discharging,

A rectifying member that guides the fine particles generated by the fine particle generation nozzle to a lower portion of the separation container,

An ultrafine particle generation device, comprising: a fine particle selection plate that suppresses floating of the fine particles guided to the lower part of the separation container by the rectifying member, and performs fine particle selection.

2. In the separation container, a plurality of the fine particle sorting plates provided with a plurality of fine particle passage holes through which the fine particles pass,

The size of the fine particle passing holes provided in the lower particle sorting plate located on the lower side is larger than the size of the fine particle passing holes provided in the upper particle sorting plate located on the upper side. The ultrafine particle generator according to claim 1, wherein

3. The ultrafine particle generator according to claim 1 or 2, further comprising a secondary gas supply means for supplying a secondary gas for raising fine particles in the separation container into the separation container. .

4. Liquid amount adjusting means for adjusting the amount of liquid supplied to the fine particle generation nozzle, nozzle supply gas pressure adjusting means for adjusting the pressure of gas supplied to the fine particle generation nozzle, and supply into the separation container Secondary gas pressure adjusting means for adjusting the pressure of the secondary gas to be performed,

By adjusting the amount of liquid supplied to the particle generation nozzle and the pressure of the gas, and by adjusting the pressure of the secondary gas supplied into the separation container, the amount of ultra-fine particles discharged from the discharge unit and The ultrafine particle generator according to any one of claims 1 to 3, wherein the particle diameter is controlled.

5. Charge supply means for supplying charge to the ultrafine particles discharged from the discharge unit The ultrafine particle generator according to any one of claims 1 to 4, further comprising: