KR101511978B1 - Jet mill - Google Patents

Abstract

The present invention relates to a jet mill, and more particularly, to a jet mill having a grinding chamber having a disk-shaped cavity portion therein; An outlet formed at a center of the cavity; A plurality of nozzles disposed at predetermined intervals along the circumferential side wall of the cavity portion, for spraying compressed air to the cavity portion; And a wired guided reflector provided on any one of the upper wall and the lower wall of the cavity corresponding to each of the nozzles to form a swirling flow in the cavity after the compressed air injected from each of the nozzles is collided And each of the nozzles is vertically inclined at a vertical spray angle set toward the corresponding wire guiding reflecting portion.
As a result, since the nozzles are vertically inclined at the vertical spray angle? Set toward each of the stream guided reflecting portions, in addition to the pulverization due to the collision between the pulverized materials in the swirling flow, The pulverization efficiency is further improved. In addition, since the shape of the swirling flow and the upward and downward wirings are intricately intertwined with each other, the possibility of collision between the objects to be ground is increased, so that the grinding efficiency is improved.

Description

Jet mill {JET MILL}

The present invention relates to a jet mill, in which a nozzle is arranged so as to have a vertical spray angle inclined upward and downward, and a wire guiding reflecting portion for guiding a stream of compressed air sprayed thereon is provided, And more particularly, to a jet mill capable of improving pulverization efficiency by inducing pulverization by collision with a stream guided reflection portion.

Jet mill (JET MILL, grinding and dispersing apparatus) refers to a device for grinding a pulverized material in a high-speed air stream and crushing the pulverized material placed on the air stream to obtain ultrafine powder.

As an example of the pulverized material, the ultrafinegared shell is called microcrystalline particles, which are used as pharmaceuticals. Most of microcrystal particles formed through a jet mill are formed most in the range of 1 to 10 mu m, and among them, those having a particle size of about 3 mu m are most suitable. Therefore, it can be said that the milling efficiency of the jet mill is higher as the grain size is increased by one milling step.

 There are various types of jet mills, but among them, a swirl flow type is widely used in which airflow is supplied through nozzles to form airflow circulating in the pulverizing chamber.

Referring to FIG. 1, the jet flow type jet mill includes a crushing chamber 101, a feed nozzle, and a crushing nozzle 140. The supply nozzle introduces the object to be crushed into the crushing chamber 101, and the crushing nozzle 140 injects the high-pressure airflow into the crushing chamber. The supply nozzle may be provided in the crushing chamber separately from the crushing nozzle 140, or one of the plurality of crushing nozzles 140 may be used as a supply nozzle.

On the other hand, since the jetting direction of the pulverizing nozzle 140 is a direction deviating from the center of the pulverizing chamber 101, a swirling air flow is formed inside the pulverizing chamber 101. In this swirling flow, It is crushed by mutual collision between water.

As a result, when the pulverized material is pulverized and the particle diameter is small, the effect of the discharge pressure is more influenced by the centrifugal force than the centrifugal force. Therefore, the pulverized material and compressed air having a particle size smaller than the predetermined particle size are discharged through the discharge port 130, respectively.

Since the above-described swirl flow jet mill is a method in which pure air is pulverized by friction and collision between pulverized materials, pulverizing apparatuses such as a pulverizer having a conventional blade and a water mill using water There is an advantage that the risk of mixing is remarkably low and an additional process of separating the pulverized material (blades or water) from the pulverized material after the pulverization is performed is not necessary. Further, there is an advantage that it is possible to crush smaller particles than other conventional crushing apparatuses in such a manner that the crushing is performed through collision between the crushed materials.

However, since the conventional jet mill described above is provided so that the crushing nozzles are shifted only in the horizontal direction, only the crushing effect due to the collision between the pulverized materials can be expected, and the swirling flow generated by the crushing flow also has a low possibility of collision There is a problem that the grinding efficiency is low.

Furthermore, since the stream of compressed air injected by the crushing nozzle is likely to be lost to the central discharge port of the crushing chamber, the crushed material that has not been crushed is moved to the center of the crushing chamber and discharged to the discharge port. There was a problem that it was deteriorated.

Korean Patent Publication No. 10-2009-12558 Korean Patent No. 10-0673976 Korean Patent Publication No. 10-2011-0018709

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an ink jet recording head capable of increasing the possibility of collision between pulverized materials in a swirling flow by causing a flow in a vertical direction of a stream generated by a nozzle, To thereby enable the jet mill to maximize the pulverization efficiency.

Another object of the present invention is to provide a jet mill capable of improving the classification efficiency by minimizing the loss of streamlines from the side wall toward the center by providing the inclined portion in the cavity inside the pulverizing chamber.

According to an embodiment of the present invention, the above object is achieved by a grinding machine comprising: a grinding chamber having a disc-shaped cavity portion therein; An outlet formed at a center of the cavity; A plurality of nozzles disposed at predetermined intervals along the circumferential side wall of the cavity portion, for spraying compressed air to the cavity portion; And a wired guided reflector provided on any one of the upper wall and the lower wall of the cavity corresponding to each of the nozzles to form a swirling flow in the cavity after the compressed air injected from each of the nozzles is collided And each of the nozzles is vertically inclined at a vertical spray angle that is set toward the corresponding wire guidance reflection part.

The wired guided reflector may be formed in a groove shape having a longitudinally curved shape so that the compressed air injected from the nozzle has a wired line guided in the other direction after being reflected by either the upper wall or the lower wall.

Wherein the wired guided-reflection unit is disposed at a position where a stream of compressed air ejected from a first nozzle of the nozzle is reflected by the wired guided-reflection unit and then crosses a stream of compressed air ejected from a second nozzle adjacent to the first nozzle As shown in FIG.

The nozzle may be provided at six equal intervals with respect to the center of the cavity.

The vertical spray angle of each nozzle may be in the range of 10 to 40 degrees.

The horizontal spray angle in which each of the nozzles is tangentially tilted in the radial direction toward the center of the cavity may be provided in a range of 20 to 80 degrees.

The wired guided reflector may be provided to intersect sequentially the upper wall and the lower wall of the cavity, and each of the nozzles corresponding to each of the wired guided reflectors may have the vertical spray angle intersecting with the corresponding direction.

A tapered portion may be further provided between the sidewall of the cavity portion and the wire guided reflection portion so that the height of the cavity portion from the sidewall along the upper wall or the lower wall toward the center of the cavity is narrowed.

The inclined portion may be spaced apart from the side wall by a predetermined distance.

The inclined portion may be formed to correspond to both the upper wall and the lower wall.

According to another embodiment of the present invention, the above object is also achieved by a grinding machine comprising: a grinding chamber having a disk-shaped cavity inside; An outlet formed at a center of the cavity; A plurality of nozzles disposed at equal intervals along a circumferential side wall of the cavity portion, the plurality of nozzles jetting compressed air to the cavity portion; And a second nozzle disposed adjacent to the first nozzle after the stream of the compressed air injected from the first nozzle of the nozzle is reflected by the wire guided reflector, corresponding to each of the nozzles, A wire guiding reflection part formed at a position intersecting with the stream line of the compressed air and having a groove shape curved in the longitudinal direction; And an inclined portion between the sidewall of the cavity portion and the wired guided reflection portion so as to narrow the height of the cavity portion from the sidewall along the upper wall toward the center of the cavity portion, And a jet mill which is vertically inclined at a vertical spray angle set toward the guide reflection portion.

The vertical spray angle may be in the range of 10 to 40 degrees, and the horizontal spray angle in which the nozzles are inclined in the tangential direction in the radial direction toward the center of the cavity may be in the range of 20 to 80 degrees.

Therefore, according to the jet mill of the present invention, since the nozzles are vertically inclined at a vertical spray angle? Set toward each of the stream guided reflectors, in addition to the pulverization due to the collision between the pulverized materials in the swirling flow, So that the pulverization efficiency is further improved since the pulverization is carried out by collision with the wire guided reflection portion.

In addition, since the shape of the swirling flow and the upward and downward wirings are intricately intertwined with each other, the possibility of collision between the objects to be ground is increased, so that the grinding efficiency is improved.

In addition, the inclined portion can prevent the pulverized material, which is less pulverized, from moving toward the center of the cavity and being discharged to the outside through the discharge port, thereby improving the classification efficiency.

1 is a perspective view showing the appearance of a conventional jet mill,
FIG. 2 is a graph showing the results of the flow analysis and the velocity distribution experiment of the jet flow in the jet mill shown in FIG. 1,
3 is a configuration diagram of a jet mill according to an embodiment of the present invention;
FIGS. 4 to 8 are views showing the results of the flow analysis and the velocity distribution experiment of the swirling flow in the jet mill shown in FIG.

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

3 and 4, a jet mill 1 according to an embodiment of the present invention includes a crushing chamber 10 having a cavity 11, an outlet 30, a plurality of nozzles 40, And a wire guidance reflection part 50. [

The pulverizing chamber (10) has a disc-shaped cavity (11) inside.

The cavity 11 forms a closed space except for the central outlet 30. The cavity 11 has a side wall 12 corresponding to the circumference and an upper wall 13 corresponding to the upper plate of the disk, And a lower wall 14.

The discharge port 30 is formed at one side of the center of the hollow portion 11, and the pulverized pulverized material and air are discharged to the outside by the discharge pressure.

The outlet 30 is typically formed in the central upper wall 13 of the cavity 11.

3, the nozzles 40 are arranged at predetermined intervals along the peripheral side wall 12 of the cavity portion 11, and inject compressed air into the cavity portion 11. As shown in Fig.

The compressed air injected by the nozzle 40 generates a swirling flow in the hollow portion 11 so that the pulverized material is pulverized by collision with each other.

The nozzles 40 may be provided in various numbers as needed. For example, as shown in FIG. 3, six nozzles 40 may be provided at equal intervals with respect to the center of the hollow portion 11. As shown in FIG.

3 and 4 (b), the nozzle 40 according to the present invention is vertically inclined at a vertical spray angle? Set toward each wire guiding reflecting portion 50 to be described later .

Therefore, in addition to the pulverization by the collision between the pulverized materials in the swirling flow, the pulverization due to the collision with the stream guided reflection portion 50 is performed primarily, and the grinding efficiency is further improved.

2, a relatively horizontal stream line is formed along the circumferential direction in the prior art. In the present invention, however, since the vertical spray angle alpha of the nozzle 40 exists, As shown in FIG. 5, since the upper and lower wirings are intertwined with each other, the possibility of collision between the pulverized materials increases, so that the grinding efficiency is improved.

Here, the vertical spray angles? May be variously formed. However, as a result of repeated experiments by the present applicant, it has been found that the grinding efficiency is improved in the range of 10 to 40 °.

Referring to FIG. 3, it is preferable that the horizontal dispensing angle β, which is tilted in the tangential direction in the radial direction of the nozzle 40 toward the center of the cavity 11, is in the range of 20 to 80 °.

The wired guided reflector 50 is provided on either the upper wall 13 or the lower wall 14 of the cavity 11 corresponding to each nozzle 40 so that compressed air injected from each nozzle 40 So as to form a swirling flow in the cavity 11 after collision, as shown in Fig.

3, the compressed air injected from the nozzle 40 may be reflected by any one of the upper wall 13 and the lower wall 14, And then a groove having a curved shape in the longitudinal direction may be provided so as to have a wire guided in the other direction.

The wired guide reflection unit 50 may be provided at various positions. However, the wired line of the compressed air injected from the first nozzle 41 of the nozzle 40 may be reflected by the wired guide reflection unit 50, It is preferable that the second nozzle 42 is provided at a position intersecting with the stream of the compressed air injected from the second nozzle 42 adjacent to the first nozzle 41.

6, the compressed air injected from the nozzle 40 collides with the wire-guided reflector 50 with the object to be crushed to perform primary crushing, and thereafter, And second pulverization due to collision is performed while intersecting the stream line of the compressed air injected from the second nozzle 42.

The wired guided reflective portion 50 may be provided on the upper wall 13 of the cavity portion 11 or on the lower wall 14. [

Alternatively, the wired guiding reflector 50 may be provided to intersect sequentially the upper wall 13 and the lower wall 14 of the cavity 11. [ In this case, each nozzle 40 corresponding to each of the wired guiding reflectors 50 is provided with a vertical spray angle? Crossing in the corresponding direction.

The inclined portion 20 is provided between the side wall of the hollow portion 11 and the stream guided reflective portion 50 and extends from the side wall 12 along the upper wall 13 or the lower wall 14 to the hollow portion 11, So that the height of the hollow portion 11 is narrowed toward the center of the hollow portion.

4 (b), the inclined portion 20 is provided to be spaced apart from the side wall 12 of the cavity portion 11 by a predetermined distance?, And is provided with a cavity portion 11 from the side wall 12 toward the center, Is reduced.

Accordingly, the swirling flow of the compressed air can be restricted at the above-described separation distance, but the swirling flow restricts the swirling flow to the center side of the hollow portion 11. Therefore, it is possible to prevent the pulverized material having less pulverization from moving toward the center of the cavity portion 11 and being discharged to the outside through the discharge port 30, thereby improving the classification efficiency.

Therefore, as shown in Figs. 7 and 8, it can be seen that the velocity gradient gradually decreases from the side wall 12 toward the center.

The inclined portion 20 may be provided on only one of the upper wall 13 and the lower wall 14, but the inclined portion 20 may be formed on either the upper wall 13 ) Or the lower wall 14, as shown in Fig.

Concrete Example

An embodiment of the present invention will be described in detail with reference to Figs. 3 to 4. Fig.

3, the jet mill 1 according to the embodiment of the present invention includes a crushing chamber 10 having a disc-shaped cavity 11 therein, 13 is provided with a discharge port 30 through which the pulverized pulverized material and air are discharged to the outside.

The nozzles 40 are arranged at six equal intervals with an arrangement angle [gamma] of 60 [deg.] Along the side wall 12 of the cavity 11. [

In the present embodiment, the nozzles 40 are provided so as to have a horizontal spray angle of 15 degrees and a vertical spray angle of 15 degrees, and the stream guided reflector 50 is provided so as to correspond to the nozzles 40, (13).

The pulverized material may be introduced into the hollow portion 11 through a separate supply nozzle (not shown), and one or more of the nozzles 40 may discharge the pulverized material together with the compressed air into the hollow portion 11 You may.

When the compressed air is jetted from each of the nozzles 40, the pulverized material and the compressed air impinge on the wire guided reflector 50, and after the pulverization is performed, the jet stream from the nozzle 40, Repeatedly crushing is performed.

On the other hand, the stream generated from each nozzle 40 is concentrated on the side wall 12 by the inclined portion 20 to form a circular swirl flow as a whole.

5, the jetting direction of the jet mill 1 according to the present invention is sprayed with the vertical jet angle?, Not the horizontal jet direction, so that in the circular jet stream, So that the possibility of collision of the pulverized material flowing in the swirling flow increases and the grinding efficiency is improved.

The inclined portion 20 also guides the compressed air reflected by the wired guide reflection portion 50 to the side wall 12 and conversely restricts the compressed air in the side wall 12 from moving toward the discharge port 30 side. Therefore, it can be seen that the velocity of the swirling flow in the side wall 12 is evenly distributed over the whole area as shown in Fig.

1: jet mill
10: Grinding chamber 11: Cavity
12: side wall 13: upper wall
14: Lower wall
20: slope part 30:
40: nozzle 41: first nozzle
42: second nozzle 50:
α: vertical spray angle β: horizontal spray angle
γ: arrangement angle θ: separation distance

Claims (12)

A crushing chamber having a disc-shaped cavity inside;
An outlet formed at a center of the cavity;
A plurality of nozzles disposed at predetermined intervals along the circumferential side wall of the cavity portion, for spraying compressed air to the cavity portion;
A wired guided reflector provided on any one of the upper wall and the lower wall of the cavity corresponding to the respective nozzles to form a swirling flow in the cavity after the compressed air injected from each nozzle collides with the nozzle;
And an inclined portion between the sidewall of the cavity portion and the stream guided reflection portion so that the height of the cavity portion from the sidewall along the upper wall or the lower wall toward the center of the cavity is narrowed,
Wherein the wired guided-reflection portion is provided in a groove shape having a curved shape in the longitudinal direction so as to have a wired line guided in the other direction after the compressed air injected from the nozzle is reflected by the upper wall or the lower wall, Wherein a stream of compressed air injected from the first nozzle is provided at a position intersecting with a stream of compressed air injected from a second nozzle adjacent to the first nozzle after being reflected by the stream guidance reflection portion, And the inclined portion is inclined toward the center of the cavity at an angle corresponding to the inclined portion. delete delete The method according to claim 1,
Wherein the nozzle is provided at six equal intervals with respect to the center of the cavity. 5. The method of claim 4,
Wherein the vertical spray angle of each of the nozzles is in the range of 10 to 40 degrees. 5. The method of claim 4,
Wherein a horizontal spray angle in which each of the nozzles is inclined in a tangential direction in a radial direction toward the center of the cavity is provided in a range of 20 to 80 degrees. The method according to any one of claims 1, 4, 5, and 6,
Wherein the wired guided reflector is provided so as to sequentially intersect with the upper wall and the lower wall of the cavity portion and each of the nozzles corresponding to each of the wired guided reflective portions has the vertical jet angle crossing in a direction corresponding thereto Jet mill. delete The method according to claim 1,
And the inclined portion is spaced apart from the side wall by a predetermined interval. The method according to claim 1,
Wherein the inclined portion is formed to correspond to both the upper wall and the lower wall. delete delete

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