KR20170055831A - Hybrid jettmill - Google Patents

Hybrid jettmill Download PDF

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Publication number
KR20170055831A
KR20170055831A KR1020150159104A KR20150159104A KR20170055831A KR 20170055831 A KR20170055831 A KR 20170055831A KR 1020150159104 A KR1020150159104 A KR 1020150159104A KR 20150159104 A KR20150159104 A KR 20150159104A KR 20170055831 A KR20170055831 A KR 20170055831A
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KR
South Korea
Prior art keywords
jet mill
air
mill body
jet
center
Prior art date
Application number
KR1020150159104A
Other languages
Korean (ko)
Inventor
이정원
Original Assignee
(주)에스엠티
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Publication date
Application filed by (주)에스엠티 filed Critical (주)에스엠티
Priority to KR1020150159104A priority Critical patent/KR20170055831A/en
Publication of KR20170055831A publication Critical patent/KR20170055831A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/06—Jet mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/0012—Devices for disintegrating materials by collision of these materials against a breaking surface or breaking body and/or by friction between the material particles (also for grain)
    • B02C19/0043—Devices for disintegrating materials by collision of these materials against a breaking surface or breaking body and/or by friction between the material particles (also for grain) the materials to be pulverised being projected against a breaking surface or breaking body by a pressurised fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/06—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in annular, tubular or hollow conical form

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

The present invention relates to a jet mill, and more particularly, to a hybrid jet mill, capable of separating and collecting nanoparticles. Provided is the hybrid jet mill, comprising: a cylindrical jet mill body; a plurality of side air nozzles arranged on an outer wall of the jet mill body to be inclined with respect to the center of the jet mill body to jet high-speed air; an outlet arranged in a position close to the center of an upper part of the jet mill; a plurality of collision plates positioned in the jet mill body at the front of the jet direction of each air nozzles; a central air nozzle disposed in a position close to the center of a lower part of a disc-shaped void to jet high-pressure air while rotating. The present invention aims to provide the hybrid jet mill in which types of air current rotation, air current collision, and collision of the collosion plates are combined.

Description

Hybrid jet mill {HYBRID JETTMILL}

The present invention relates to a jet mill. And more particularly, to a hybrid jet mill capable of separating and collecting nanoparticles.

Nanotechnology refers to the technology related to particles belonging to the area of nanotechnology that manipulates molecules or atoms with particles of at least one dimension less than 100 nm of which the object to be treated is to fabricate new materials, structures, machines, devices, do.

Nanostructured materials are being studied extensively because nano powders have properties that micron or submicron powders do not have in various fields of application. This is because the effect of surface area increase and capillary effect Most of them appear.

The reason why nano powder materials are of particular interest is that there are many possibilities that can be processed and used in other forms besides the use of powders themselves, such as optical coatings, heat shielding coatings and functional sintered parts, Can be used in the form of a composite material. Thus, a wide range of applications are expected in the fields of electronics, optoelectronics, magnetic fields, biomedicals, pharmaceuticals, cosmetics, energy, catalysts and structures.

The pulverization process of particles for producing nano powder material can be divided into dry pulverization and wet pulverization. For dry pulverization, a jet mill and a high speed hammer mill, in which a classifier is built or externally, are mainly used. However, it is known that jet mill pulverization is most suitable for the production of high purity highly functional superfine powder among these pulverizers. However, up to now, powder production of 1 탆 or less has been mainly produced by a wet grinding process in a small amount.

The jet mill is classified into air flow type, air flow type, impingement plate impingement type and composite type jet mill according to the principle of pulverizing the jet flow, and it is possible to obtain dry pulverization and ultrafine powder, It is possible to produce product powder in a short period of time and to produce a temperature drop due to the use of compressed air and to cause a temperature drop due to the use of compressed air. Therefore, it can be crushed at room temperature and has excellent interconnection with other processes such as dry mixing and coating, It has the advantage of excellent disintegration effect of dispersing into single particles and the use of compressible air as a grinding medium, so that there is no contamination or destruction of final product. However, there is a disadvantage in that a large amount of compressed air or steam is required, a large power is required, and a large amount of air is contained in the pulverized material, thus necessitating a separate collecting device.

In order to produce ultrafine powder having a particle size of 1 mu m, it is necessary to satisfy a condition that particles can sufficiently collide even at a particle diameter of 1 mu m. For this purpose, it is essential to accelerate the supersonic region at a velocity of 300 m / s or more.

Korean Patent Publication No. 10-2005-0024257 Korea Patent No. 10-0673976

It is an object of the present invention to provide a hybrid jet mill in which airflow, airflow, and collision-protruding stone are combined.

Further, the present invention provides a hybrid jet mill capable of maximizing the collision between particles and a wall or the collision between particles through the collision plate optimal placement and circulating airflow formation within an acceleration distance with acceleration of the supersonic region band for ultrafine powder milling .

The present invention relates to a jet mill having a cylindrical jet mill body, a plurality of side air nozzles arranged on the outer wall of the jet mill body and inclined with respect to the center of the jet mill body for jetting high speed air, A plurality of impingement plates positioned in the jet mill body in front of the ejection direction of the respective air nozzles, and a central air nozzle disposed at approximately the center of the disc-shaped cavity bottom of the jet mill body and rotating and ejecting high-pressure air And a plurality of the jet mills.

According to another aspect of the present invention, there is provided a hybrid jet mill, wherein the impingement plate is disposed between a center air nozzle and a side air nozzle.

According to another embodiment of the present invention, the central air nozzle has a substantially T-shaped configuration including a vertical tube extending vertically along the axial direction of the jet mill body and a horizontal tube extending perpendicularly to the vertical tube at the upper end of the vertical tube, And the horizontal tube is provided with a pair of jet holes on a diagonal line so as to be rotated by the jetting force of the air.

According to another embodiment of the present invention, there is provided a hybrid jet mill, wherein a plurality of additional injection holes are provided in the vertical tube.

According to another aspect of the present invention, there is provided a hybrid jet mill, wherein the outlet is provided with a body for preventing the discharge of coarse particles.

According to another embodiment of the present invention, there is provided a hybrid jet mill, which is connected to an outlet and in which a cyclone and a dust collector, which can classify particles in a thick order, are connected in series.

According to another aspect of the present invention, there is provided a hybrid jet mill, wherein the cyclone and the dust collector include first to third cyclones, a membrane bag filter dust collector, and an electrostatic precipitator.

According to another aspect of the present invention, there is provided a hybrid jet mill, wherein the side air nozzles are designed in the form of a venturi tube.

The hybrid jet mill provided by the present invention is advantageous in that it can be pulverized into ultrafine powders in a compact size by a jet mill in which air flow, air current collision and collision plate collision type are combined.

Further, the hybrid jet mill provided by the present invention further has a central nozzle that rotates at the center of the main body, thereby maximizing the collision between particles and also minimizing the kinetic energy of the airflow.

1 is a view showing a hybrid jet mill in which first to third cyclones, a membrane bag filter dust collector, and an electrostatic precipitator are installed in series in accordance with an embodiment of the present invention;
2 is a partially cutaway perspective view of a hybrid jet mill according to an embodiment of the present invention,
3 is a perspective view illustrating a central nozzle of the hybrid jet mill according to an embodiment of the present invention,
FIG. 4 is a schematic view showing an airflow formed in a hybrid jet mill according to an embodiment of the present invention. FIG.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a view showing a hybrid jet mill in which first to third cyclones, a membrane bag filter dust collector, and an electrostatic precipitator are installed in series according to an embodiment of the present invention. The hybrid jet mill 100 according to an embodiment of the present invention may include a first cyclone 200, a second cyclone 300, a third cyclone 400, a man-brake bag filter 500 ) And an electrostatic precipitator (600).

The first cyclone 200 classifies particles of 7 μm or less, the second cyclone 300 classifies particles of 5 μm or less, the third cyclone 400 classifies particles of 1 μm or less, The particle size of the dust collector 500 is 0.3 μm or less, and the size of the electrostatic precipitator 600 is 100 nm or less.

On the other hand, an air pump (not shown) for supplying compressed air to a plurality of side and center air nozzles 120 and 150, which will be described later, is connected to one side of the jet mill main body 100, Not shown).

2 is a partially cutaway perspective view of a hybrid jet mill according to an embodiment of the present invention. In the hybrid jet mill 100 according to the embodiment of the present invention, various members for grinding particles are installed in a cylindrical jet mill body 110. First, the jet mill body 110 is composed of cylindrical sidewalls and upper and lower surfaces to form a cylindrical pore. A plurality of lateral air nozzles 120 are installed on the side wall of the jet mill body 110. In FIG. 2, six lateral air nozzles 120 are shown. The side air nozzles 120 are disposed to be inclined with respect to the center of the cylindrical jet mill body 110. The side air nozzles 120 are connected to an air supply pipe 122 connected to the high pressure air pump and are connected to the branch air nozzles 120 in order to supply the high pressure air supplied from the air supply pipe 122 to the side air nozzles 120 124 are additionally provided. The branch pipe 124 is formed in a donut shape to supply air to all the lateral air nozzles 120 disposed around the jet mill body 110. The raw air supply pipe 130 is connected to the side air nozzle 120 located closest to the air supply pipe 122. The raw material supply pipe 130 connects the raw material supply device 10 (see FIG. 1) to the jet mill 100 so as to supply the raw material.

Since the side air nozzles 120 are disposed to be inclined with respect to the center of the jet mill body 110, high-pressure air is jetted through the side air nozzles 120 to form a high speed swirling flow. The raw material supplied into the jet mill body 110 through the raw material feed pipe 130 by the high-speed swirling air current is pulverized into the pulverized material.

A plurality of impingement plates 140 are provided in the jet mill body 110. Preferably, the impingement plate 140 is located in front of the jetting direction of the side air nozzles 120 so that the particles move at a high speed by the high-pressure air jetted from the side air nozzles 120 and hit the impingement plate 140 I can do it. FIG. 2 shows an example in which six impingement plates 140 are provided.

Further, a central air nozzle 150 is additionally provided at a center lower portion of the jet mill body 110.

3 is a perspective view illustrating a central nozzle of the hybrid jet mill according to an embodiment of the present invention. 3, the central air nozzle 150 includes a vertical pipe 152 extending upward and downward along the axial direction of the jet mill body 110, a vertical pipe 152 at an upper end of the vertical pipe 152, And a horizontal tube 154 extending from the horizontal tube 154. As shown in FIG. The horizontal tube 154 extends to both sides from the vertical tube 152 and has injection holes 154 opposite to each other near both ends of the horizontal tube 154. At least one injection hole 155 is provided in the horizontal pipe 154 so that high pressure air supplied to the central air nozzle 150 is injected and can be rotated in a direction opposite to the injection direction by the injection force. That is, the injection hole 155 injects air in a direction perpendicular to the extending direction of the horizontal tube 154 and the extending direction of the vertical tube 152. At this time, as the distance from the center of the horizontal tube 154 to the injection hole 155 increases, the rotational force can be increased. Preferably, two or more injection holes 155 may be provided, or may be provided in pairs in the diagonal direction.

In addition, a plurality of additional injection holes 153 may be additionally provided in the vertical tube 152, and the air injected by the additional injection hole 153 and the injection hole 155 may cause another air flow for moving the particles And collides with a swirling airflow formed by the air injected from the side air nozzle 120 (see FIG. 2), so that the effect of the airflow impinging jet mill can be obtained.

Referring again to FIG. 3, the outlet 160 is located in the upper center of the jet mill body 110. The sufficiently pulverized fine powders are those in which the weight of the particles is lighter and the particles are raised by the swirling air current. In addition, the outlet 160 may be provided with a sieve 170 in order to prevent the powder having a predetermined size or more from being discharged. The particles discharged through the outlet 160 through the sieve 170 as described above are discharged through the third cyclone 200, 300, 400 connected in series to the jet mill body 110, the membrane bag filter 500, And electrostatic precipitator 600, and are sorted by size.

FIG. 4 is a view schematically showing airflow formed in a hybrid jet mill according to an embodiment of the present invention. (1) shows flows flowing through the side air nozzles 120 (see FIG. 3). When high pressure air is injected through the side air nozzle 120, the particles move together with the air to be injected. The high pressure air and the airflow of the particles hit the impingement plate 140 (see FIG. 3) located in front of the traveling direction, and the particles are crushed due to the collision at this time. On the other hand, the airflow collides with the impingement plate 140 and then is repelled by the side wall of the jet mill body 110 (see FIG. 2), causing a secondary collision with the side wall of the jet mill body 110. 2 shows the flow toward the side wall of the jet mill body 110 after collision with the impingement plate 140. Also, ③ is the flow that is thrown out from the side wall again after collision with the side wall.

On the other hand, (5) shows the air flow injected from the injection hole 155 of the central air nozzle 150 (see FIG. 2). The central air nozzle 150 rotates in a direction opposite to the ejecting direction by the jetting force injected through the jetting hole 155. Accordingly, the high-pressure air injected from the injection hole 155 and the additional injection hole 153 can be injected at 360 °. The airflow ④ produced by the air injected by the injection hole 155 and the additional injection hole 153 may collide with the impact plate 140 and may pass through the gap between the adjacent impact plates 140 So that it can collide with the air stream ③ to generate an airflow impact jet mill effect.

That is, the hybrid jet mill according to the present invention greatly increases the number of times that the particles to be ground can collide with each other and the number of times that the particles can collide with the impact plate 140 or the jet mill body 110, .

100: jet mill 110: jet mill body
120: side air nozzle 122: air supply pipe
124: branch 130: raw material supply pipe
140: impingement plate 150: central air nozzle
160: outlet 170:
200: first cyclone 300: second cyclone
400: Third cyclone 500: Membrane bag filter dust collector
600: Electrostatic precipitator

Claims (8)

A jet mill body forming a cylindrical cavity;
A plurality of side air nozzles disposed on side walls of the jet mill body and inclined with respect to the center of the jet mill body for jetting high-speed air;
An outlet disposed approximately at the center of the upper portion of the jet mill body;
A plurality of impingement plates located in the jet mill body in front of the jet directions of the respective air nozzles; And
And a central air nozzle which is disposed substantially at the center of the disc-shaped cavity bottom of the jet mill body and which rotates and ejects high-pressure air. The method according to claim 1,
Wherein the impingement plate is disposed between the central air nozzle and the side air nozzles. The method according to claim 1,
The central air nozzle has a substantially T-shaped configuration comprising a vertical tube extending vertically along the axial direction of the jet mill body and a horizontal tube extending perpendicularly to the vertical tube at the upper end of the vertical tube,
Wherein the horizontal tube has at least one jet hole so as to be rotatable by the jetting force of the air. The method of claim 3,
Characterized in that the vertical tube is provided with a plurality of additional injection holes. The method according to claim 1,
Wherein the outlet is provided with a body for preventing the discharge of coarse particles. The method according to claim 1,
And a cyclone and a dust collector capable of classifying the particles in a thick order are connected in series. The method according to claim 1,
Wherein the cyclone and the dust collector comprise first to third cyclones, a membrane bag filter dust collector, and an electrostatic precipitator. The method according to claim 1,
Wherein the side air nozzles are designed in the form of a venturi tube.
KR1020150159104A 2015-11-12 2015-11-12 Hybrid jettmill KR20170055831A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109317242A (en) * 2018-09-20 2019-02-12 湖北昌丰粮机有限公司 A kind of rice polishing residue treatment dedusting device
KR200490033Y1 (en) * 2018-06-12 2019-09-11 농업회사법인 주식회사 한국대농농업 Rice swipper using compressed air
KR102530524B1 (en) * 2022-08-19 2023-05-10 이승민 Manufacuturing Method of 2D Layered Material using Dry Exfoliation and 2D Layered Material Manufactured by the Same
KR102611645B1 (en) * 2023-05-03 2023-12-08 이승민 Manufacuturing Method of 2D Layered Material using Dry Exfoliation and 2D Layered Material Manufactured by the Same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200490033Y1 (en) * 2018-06-12 2019-09-11 농업회사법인 주식회사 한국대농농업 Rice swipper using compressed air
CN109317242A (en) * 2018-09-20 2019-02-12 湖北昌丰粮机有限公司 A kind of rice polishing residue treatment dedusting device
KR102530524B1 (en) * 2022-08-19 2023-05-10 이승민 Manufacuturing Method of 2D Layered Material using Dry Exfoliation and 2D Layered Material Manufactured by the Same
KR102611645B1 (en) * 2023-05-03 2023-12-08 이승민 Manufacuturing Method of 2D Layered Material using Dry Exfoliation and 2D Layered Material Manufactured by the Same

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