JP2007237079A - Particulate distributor and jet mill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jet mill whose treatment capability can be greatly improved without increasing the installation surface area and a particulate distributor usable for various particulate distribution uses other than the jet mill. <P>SOLUTION: The jet mill comprises a jet mill main body to form a disc-like cavity, a plurality of air nozzles installed in a ring-like outer wall of the jet mill main body for generating high speed air current in the disc-like cavity, and an outlet positioned at approximately the center of the disc-like cavity of the jet mill main body, wherein the jet mill has a configuration in which the jet mill main bodies whose disk-like cavities each forms a ring-like crushing zone for crushing an object to be crushed by the high speed air current supplied from a plurality of the air nozzles are stacked in a plurality of steps, and a particulate distributor having particulate distributing functions in a number corresponding to the number of the stacked jet mills is installed on the top step of the jet mills stacked in the plurality of steps. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention allows fine particles having a large particle diameter to be micronized inside a grinding chamber by a high-speed air flow supplied from an air nozzle inclined to the outer wall to a grinding chamber formed as a cavity inside the jet mill body. The present invention relates to a jet mill that continuously pulverizes into fine powder having a particle size of the order, and at the same time performs classification by a swirling air flow, and a powder distribution device that uses this, especially while keeping the installation space small. The present invention relates to a jet mill capable of greatly improving the processing capacity, and to a powder distribution apparatus that can be used for various powder distribution applications as well as being applicable to the jet mill.

  A jet mill pulverizes coarse particles with a high-speed air flow supplied into the pulverization chamber from an air nozzle arranged at an inclination on the outer wall, and also classifies with a swirling air flow Thus, it is known that the pulverizer is suitable for fine pulverization. The jet mill has a simple internal structure of the grinding chamber, and can easily disassemble and assemble the upper and lower surfaces of the grinding chamber, and can be easily cleaned before and after use. There are features.

  On the other hand, since the granular material is pulverized only by an air flow inside the pulverizing chamber, the pulverized granular material is pulverized to a predetermined particle size, or the particle size of the object to be pulverized (refers to the pulverized granular material). It is difficult to manage such that the variation in the size becomes small. For this reason, various improvements have been made to pulverize the granular material to a predetermined particle size or to reduce the variation in the particle size of the material to be crushed. For example, in order to enable adjustment of the pulverization particle size over a wide range, the inflow angle of the air flow supplied from the air nozzle to the inside of the pulverization chamber can be changed (for example, see Patent Document 1), and classification accuracy In order to improve the above, there has been known one in which a special mechanism for classification such as a classification rotor is provided around the outlet pipe (see, for example, Patent Document 2).

However, although the swirling fluid energy type pulverizer disclosed in Patent Document 1 enables adjustment of the pulverization particle size over a wide range, the swirling flow is simultaneously pulverized by injecting compressed air. Is formed, and the classification action is only exerted. Therefore, there is a problem that classification accuracy is poor and large particles are discharged.
Further, the horizontal swirling flow jet mill disclosed in Patent Document 2 improves the low classification accuracy of Patent Document 1, but the swirling flow formed by the compressed air and the swirling flow formed by the classification rotor. Therefore, there are problems such as vortex disturbance and fine powder adhering to the rotor wall.

  In addition, these conventional technologies all have new complicated mechanical parts such as a special mechanism that makes the inflow angle of air flow variable and a special mechanism for classification inside the grinding chamber. It is added inside the grinding chamber. These are the features of the jet mill that the internal structure of the crushing chamber is simple, the upper and lower surfaces of the crushing chamber can be easily disassembled and assembled, and cleaning before and after use is easy. It was lost and not always satisfactory.

JP 52-44450 A JP-A-63-319067

  By the way, in the past, in order to create a jet mill having a greatly improved processing capability (grinding capability), a method of increasing the size, called so-called scale-up, has been used. This method is a method of increasing the diameter of the disc-shaped jet mill main body (effective diameter: for example, the pitch circle diameter connecting the tips of the air nozzles). It was a practical limit.

  This is because, if an attempt is made to produce a large effective diameter, the dimensional accuracy of the jet mill body deteriorates, and as a result, the particle size distribution of the object to be crushed varies and the control of the particle diameter becomes difficult. is there. In addition, there is a problem that the processing cost of the jet mill body is increased, and the disassembly and assemblability are deteriorated due to the weight increase of each part.

  Another method is to arrange a plurality of manufacturable jet mills. However, in this case, there is a problem that the labor for managing the apparatus increases, and there is also a problem that the installation space is greatly increased.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to solve the above-mentioned problems, the particle size of the finely pulverized material becomes a desired particle size, and the particle size thereof. In addition to being able to achieve high classification accuracy, the internal structure of the pulverization chamber, which is a feature of the jet mill, is simple, and the upper and lower surfaces of the pulverization chamber can be easily disassembled and assembled. This is a jet mill capable of greatly improving the processing capacity without increasing the installation space, taking advantage of the feature that it can be easily cleaned before and after use, and applied to this jet mill. Of course, it is possible to provide a powder distribution apparatus that can be used for various powder distribution applications.

  In order to solve the above-mentioned problems, a granular material distribution device according to the present invention includes a main body in which a disk-shaped cavity is formed, and a ring-shaped outer wall of the main body that is inclined with respect to the center of the disk-shaped cavity. And a plurality of air nozzles for generating a high-speed air flow in the disk-shaped cavity, and a plurality of distribution granular material discharge ports provided on the lower surface of the disk-shaped cavity ( Claim 1).

  Further, the jet mill according to the present invention is disposed on the jet mill main body in which a disk-shaped cavity is formed, and on the ring-shaped outer wall of the jet mill main body, inclined with respect to the center of the disk-shaped cavity, A plurality of air nozzles for generating a high-speed air flow in a disk-shaped cavity; and an outlet disposed at substantially the center of the disk-shaped cavity of the jet mill body, the disk-shaped cavity of the jet mill body However, the jet mill main body forming a ring-shaped pulverization zone for pulverizing the granular material by the high-speed air flow supplied from the plurality of air nozzles is formed in a plurality of layers, and the plurality of layers is stacked. According to another aspect of the present invention, a powder body supply port is provided in each stage of the jet mill.

Further, another jet mill according to the present invention is arranged on a jet mill main body in which a disk-shaped cavity is formed, and on a ring-shaped outer wall of the jet mill main body, inclined with respect to the center of the disk-shaped cavity. A plurality of air nozzles for generating a high-speed air flow in the disk-shaped cavity, and an outlet disposed substantially at the center of the disk-shaped cavity of the jet mill body. And a plurality of stages of jet mill main bodies forming a ring-shaped pulverization zone for pulverizing powder particles by the high-speed air flow supplied from the plurality of air nozzles. A powder distribution device having a powder distribution function corresponding to the number of the stacked jet mills is arranged on the upper stage of the stacked jet mills (Claim 3).
Here, as the powder and particle distribution device, the powder and particle distribution device according to claim 1 can be suitably used (claim 4).

  The jet mill main body includes a disc-shaped upper casing and a lower casing, and the ring-shaped outer wall interposed between the upper casing and the lower casing. In the meantime, it is preferable that the lower casing of the upper jet mill and the upper casing of the lower jet mill are substantially integrated.

Further, the pulverized object moving from the outside of the disk-shaped cavity to the inside is prevented from flowing into the jet mill body at the other stage at the outlet disposed at the substantially center of the jet mill body. It is preferable to arrange a backflow prevention member for this purpose (claim 6).
Moreover, it is preferable to arrange | position the granular material supply part to each of the said laminated jet mill corresponding to the distribution granular material discharge port of the said granular material distribution apparatus.

  Further, another jet mill according to the present invention is arranged on a jet mill main body in which a disk-shaped cavity is formed, and on a ring-shaped outer wall of the jet mill main body, inclined with respect to the center of the disk-shaped cavity. A plurality of air nozzles for generating a high-speed air flow in the disk-shaped cavity, and an outlet disposed substantially at the center of the disk-shaped cavity of the jet mill body. And a jet mill main body forming a ring-shaped pulverization zone for pulverizing powder particles by the high-speed air flow supplied from the plurality of air nozzles, and the jet A pulverized object moving from the outside to the inside of the disk-shaped cavity is prevented from flowing into the jet mill body at the other stage at the outlet disposed at the center of the mill body. It is possible to practically as a jet mill, characterized in that the backflow prevention member arranged for (claim 8). In this case, a powder and particle distribution device as described above may be provided separately.

  In addition, the above-described characteristic configuration of the jet mill according to the present invention is a jet mill having another basic configuration (for example, Japanese Patent Application No. 2004-255528 “Jet Mill” (Japanese Patent Application Laid-Open No. 2005-131633). And a narrow path that separates the pulverization zone and the classification zone in the cavity of the jet mill body) can be suitably employed (claims 9 to 13).

  More specifically, in addition to the above-described configuration, a ring that is disposed inside the pulverization zone, communicates with the exit space, and is located inside the pulverization zone, and classifies objects to be pulverized by the air flow. It is preferable to have a ring-shaped narrow path that is disposed between the pulverization zone and the classification zone and that divides and communicates with the pulverization zone and the classification zone.

Here, the ring-shaped narrow path is formed by ring-shaped barriers that are respectively attached to the upper and lower surfaces of the cavity substantially parallel to each other at a predetermined interval at a predetermined position in the radial direction of the disk-shaped cavity. A ring-shaped channel is preferably formed (claim 10).
In addition, it is preferable that a powder supply port is provided in each stage of the jet mill that is stacked in a plurality of stages. Furthermore, in addition to the above configuration, it is preferable that an upper stage of the jet mills stacked in a plurality of stages is provided with a powder and particle distribution function corresponding to the number of the stacked jet mills (claim 12).
Here again, the powder distribution device according to claim 1 can be suitably used as the powder distribution device (claim 13).

  The ring-shaped crushing zone is an internal space in which the upper surface and the lower surface of the disk-shaped cavity are asymptotic to each other toward the center, and the cavity is narrowed toward the center direction. The path is a ring-shaped channel formed between the protrusions on the upper surface and the lower surface of the cavity, which are arranged at predetermined intervals in a predetermined radial position of the disk-shaped cavity. It is preferable that there is (claim 14).

  According to the present invention, as described in detail below, the finely pulverized product has a desired particle size, and the variation in the particle size can be reduced to obtain high classification accuracy. The internal structure of the crushing chamber, which is a feature of the jet mill, is simple, the top and bottom surfaces of the crushing chamber can be easily disassembled and assembled, and cleaning before and after use is easy. A jet mill that can be used as it is, can increase the processing capacity without increasing the installation space, and can be applied to this jet mill. A body dispensing device can be provided.

Hereinafter, a jet mill according to the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.
In the embodiment described below, a configuration having a narrow path (classification ring channel) that divides a pulverization zone and a classification zone in a cavity of a jet mill main body as disclosed in the aforementioned Japanese Patent Application Laid-Open No. 2005-131633. An example based on the above is shown, but the present invention is not limited to this.

  FIG. 1 is a cross-sectional plan view conceptually showing a jet mill that constitutes one shape unit (hereinafter referred to as a unit jet mill) that constitutes a multi-stage jet mill according to an embodiment of the present invention. FIG. 2 is a side sectional view of the unit jet mill shown in FIG.

  As shown in FIGS. 1 and 2, the unit jet mill 38 according to the present embodiment has a tangent (or center) to the ring-shaped (cylindrical) outer wall 4 of the disk (cylindrical or hollow disk) -shaped jet mill body 2. In the pulverizing chamber 8 in the jet mill body 2, the object to be crushed is classified while being pulverized by a high-speed air flow supplied inward from the air nozzle 6 arranged to be inclined with respect to the line). is there.

  The crushing chamber 8 is provided between the disc-shaped upper plate (upper casing) 10 and the lower plate (lower casing) 12 forming the jet mill main body 2 and the outer wall 4 and an outlet 30 described later (see FIG. 2). Is formed as a disk-shaped (ring donut-shaped or cylindrical) cavity (internal space) inside the jet mill main body 2 surrounded by the two. Although not shown, the upper plate 10, the lower plate 12, and the outer wall 4 are sealed with a sealing material such as an O-ring so that air and fine powder of the pulverized object are not leaked to the outside. .

  As shown in FIGS. 1 and 2, a plurality (two in this case) of air nozzles 6 are provided on the annular outer wall 4 of the jet mill body 2 at an equal interval and inclined with respect to the tangent line. The air flow supplied from the air nozzle 6 is jetted into the grinding chamber 8 at a high speed, and the powder particles collide with each other or collide with the wall surface of the grinding chamber 8 so that the powder particles are crushed. The Further, when the air flow swirls at high speed inside the crushing chamber 8, the powder particles supplied into the crushing chamber 8 also swirl at high speed, and the swirling motion causes the powder particles to collide with each other. Alternatively, the pulverization is performed by colliding with the wall surface of the pulverization chamber 8.

  Compressed air supplied from a compressed air source (not shown) is supplied to the air nozzle 6 via a pipeline (not shown), and is squeezed by the air nozzle 6 to form a high-speed air flow. This high-speed air flow is supplied from the air nozzle 6 to the grinding chamber. 8 is ejected into the interior.

  On the other hand, the granular material to be pulverized is supplied from a granular material supply port 14 that is inclined at substantially the same angle with respect to the outer wall 4 of the jet mill main body 2 in the same manner as the air nozzle 6. In this embodiment, as will be described later, the powder discharged from the powder discharge port of the powder distribution device 40 is supplied to the jet mill main body 2 of each unit jet mill 38 by airflow (from above). , And supplied to the inside of the pulverization chamber 8 from the granular material supply port 14.

  In the present embodiment, the powder supply port 14 is a funnel (16) virtually shown as a function of supplying the powder and air for supplying air for supplying the powder to the crushing chamber 8. It consists of a supply nozzle 18, a diffuser 20 that mixes the granular material supplied from the funnel (16) and the air supplied from the air supply nozzle 18 and supplies the mixture to the inside of the crushing chamber 8. An appropriate amount of powder is supplied from the particle distributor.

  The granular material supplied from the granular material supply port 14 is supplied into the grinding chamber 8 by a high-speed air flow. The granular material supplied to the inside of the pulverizing chamber 8 is mainly pulverized by the high-speed air flow ejected from the air nozzle 6, and from the air nozzle 6 and the air flow ejected together with the granular material from the granular material supply port 14. With the supplied air stream, the inside of the crushing chamber 8 is swung at high speed, and the powder particles collide with each other or the wall surface inside the crushing chamber 8 and are pulverized into fine powder.

  In the unit jet mill 38 according to the present embodiment, a ring-shaped barrier formed inside the crushing chamber 8 is provided at a position approximately in the middle of the radial width of the crushing chamber 8 formed as a ring donut-shaped cavity. Certain classification rings 22 and 24 are disposed, and the crushing chamber 8 is divided into an outer ring (ring donut) -shaped crushing zone 26 and an inner ring (ring donut) -shaped classification zone 28. A classifying ring channel 23 that becomes a narrow path is formed by a gap between the classifying rings 22 and 24, and the divided pulverizing zone 26 and the classifying zone 28 are communicated with each other.

  The classifying rings 22 and 24 as ring-shaped barriers have a predetermined interval (opening width of the classifying ring channel 23) between the upper surface and the lower surface of the crushing chamber 8 formed as a cavity inside the jet mill body 2. The upper classifying ring 22 is disposed on the upper plate 10 of the jet mill body 2 and the lower classifying ring 24 having the same diameter and substantially symmetrical with the lower plate 12 of the jet mill main body 2 is predetermined. The ring-shaped barrier is divided and communicated with the outer pulverization zone 26 and the inner classification zone 28.

  That is, the classification ring channel 23 that becomes a narrow path of the unit jet mill 38 according to the present embodiment is formed by the space between the upper and lower classification rings 22 and 24 that become ring-shaped barriers. The divided pulverization zone 26 and classification zone 28 are communicated with each other.

  Here, as the classification rings 22 and 24, those having various intervals (opening width of the classification ring channel 23) are prepared, and the classification rings 22 and 24 arranged in the crushing chamber 8 of the jet mill body 2 are prepared. By exchanging 24, the interval between the classification rings 22 and 24 (opening width of the classification ring channel 23) can be easily adjusted to an appropriate interval according to the type of powder to be crushed.

  As shown in FIG. 2, the wall surfaces of the classification rings 22 and 24 arranged in the pulverization chamber 8 on the pulverization zone 26 side ensure that the powder particles in the pulverization process collided are returned to the pulverization zone 26. It is preferable that the corner is a shape constituted by a convex curve toward the center or a surface inclined toward the center. Further, as shown in FIG. 2, the wall of the classification rings 22 and 24 on the classification zone 28 side smoothly flows the material to be crushed through the classification channel 23 between the classification rings 22 and 24 into the classification zone 28. Thus, it is preferable that the corners have a shape formed by a convex curve toward the center or a surface inclined toward the center.

  Further, in the unit jet mill 38 according to the present embodiment, an outlet 30 is provided inside (center part) of the crushing chamber 8 formed as a donut-shaped cavity inside the jet mill body 2. The upper side of the edge of the lower plate 12 of the outlet portion 30 has a shape rising toward the inner surface of the grinding chamber 8. Similarly, the lower side of the edge of the upper plate 10 of the outlet portion 30 is the grinding chamber. 8 The shape falls toward the inner surface. These shapes serve to suppress the discharge of coarse particles from the outlet of the crushing chamber 8.

  Since the unit jet mill 38 according to the present embodiment is configured as described above, the granular material to be pulverized is supplied from the funnel (16), the air supplied from the air supply nozzle 18, and the air. Are mixed in the diffuser 20 and supplied to the pulverization zone 26 outside the pulverization chamber 8, and are mainly pulverized by the high-speed air flow ejected from the air nozzle 6, and supplied from the air nozzle 6 and the air flow ejected together with the granular material. The pulverized zone 26 of the pulverizing chamber 8 is swung at a high speed by the air flow, and the powder particles collide with each other or the inner wall surface of the pulverizing chamber 8 in the pulverizing zone 26 to obtain a fine powder (object to be crushed). To be crushed.

The above is the outline of the structure and operation of the unit jet mill 38 constituting the jet mill according to the present embodiment.
Next, the jet mill 50 according to the present embodiment in which the unit jet mills 38 described above are stacked in multiple stages will be described.

  In the jet mill 50 according to the present embodiment, basically, as shown in FIG. 3, the unit jet mills 38 described above are stacked in multiple stages (here, four stages), and further, the units stacked in this upper stage are stacked. A powder distribution device 40 having a powder distribution function corresponding to the number of jet mills 38 is arranged. As is clear from FIG. 3, when the unit jet mills 38 are stacked, the upper half and the lower half of the unit jet mills adjacent in the vertical direction are positioned so that their outer surfaces are in close contact with each other. Join.

  That is, in FIG. 3, reference numeral 38 </ b> A indicates a unit (upper unit) corresponding to the upper half of the unit jet mill 38 located at the uppermost position, and four stages from the second stage shown by reference numerals 38 </ b> B to 38 </ b> D. The unit (intermediate unit) located in the eye is formed by switching the upper half and the lower half of the unit jet mill 38 described above by switching the upper and lower sides. Reference numeral 38E denotes a unit (lower unit) corresponding to the lower half of the unit jet mill 38 located at the lowermost part.

  In other words, here, the four-stage stacked unit jet mill 38 is replaced with three types of easy-to-manufacture shapes, thereby reducing the materials used and the manufacturing costs as a whole. In addition, the production man-hours are reduced. However, this manufacturing method itself does not specify the manufacturing method of the jet mill according to the present invention.

  By the way, when unit jet mills 38 are stacked in multiple stages in this way, as shown in FIG. 3, the inside of the outlet 30 of the object to be crushed inside each of the above-mentioned units (may be called unit jet mills). Preferably, the outlet pipe 32 is provided. The outlet pipe 32 is a short pipe made of a hard material provided in the outlet portion 30 of the unit jet mill 38 and having a shape whose diameter is reduced in the discharge direction (downward here) of the object to be crushed. .

  The outlet pipe 32 has a function of preventing the object to be crushed discharged from the outlet portion 30 from flowing into the pulverizing chamber 8 of another unit jet mill. Located towards the exit of the mill.

Next, the granular material distribution apparatus 40 arrange | positioned at the upper part of the jet mill 50 in FIG. 3 is demonstrated.
The powder distribution device 40 should also be referred to as a modified embodiment of a jet mill. The supplied powder particles are divided into four parts by a distribution mechanism having a cross-sectional view as shown in FIG. It has a function of distributing approximately evenly to the two granular material discharge pipes (supply pipes). The powder distribution device 40 utilizes the powder distribution capability, and for example, collects the distributed powder in a bag or throws it into a plurality of reactors. Can be used for dispensing applications.

  The powder distribution device 40 includes a funnel 16 that is also used in a conventional jet mill, an air supply nozzle 18 that supplies air for supplying powder to the grinding chamber 8a that also serves as a distribution chamber, and a funnel. The diffuser 20 which mixes the granular material supplied from 16 and the air supplied from the air supply nozzle 18 and supplies it to the inside of the pulverizing chamber 8a, the granular material distribution mechanism 42 in the pulverizing chamber 8a, used It consists of an air outlet 46 and the like.

  The distribution mechanism 42 performs distribution while pulverizing the granular material in the pulverization chamber 8a. Here, the distribution mechanism 42 is supplied from the funnel 16 through the diffuser 20 by the air flow supplied from the air supply nozzle 18. The powder granules that have been swirled at high speed in the crushing chamber 8a that also serves as the distribution chamber are sequentially crushed, and the particles that have been pulverized to some extent and easily flowed out are the center of the crushing chamber 8a that also serves as the distribution chamber. It is sent out from the delivery port provided in the section to the lower distribution zone 8b.

  In the distribution zone 8b, the powder fed from the crushing chamber 8a, which also serves as the distribution chamber, is also supplied to the powder discharge port 44 provided corresponding to the number of unit jet mills stacked. In this way, the powder particles are distributed. As described above, by using the powder distribution device 40, the powder particles are supplied substantially uniformly to the unit jet mills of each stage, so it is necessary to provide a plurality of powder distribution devices (not shown). Absent. In addition, the above-mentioned granular material discharge port 44 is supplied with a feeding pipe 34 for supplying the granular material fed into each unit jet mill (this is an example, and here, it is connected to the lowest unit jet mill). Is connected).

  By the way, since a plurality of unit jet mills are stacked as described above, in order to efficiently supply the distributed powder particles sent from the powder particle distribution device 40 to each of the stacked unit jet mills. When connecting the feeding means from the powder distribution device 40 such as the feeding pipe 34 exemplified above to each unit jet mill, for example, as shown in FIG. 5, the air nozzle 6 and the feeding pipe 34 are It is preferable to properly arrange the connected powder supply ports 14.

  Here, the air nozzle 6 and the granular material supply port 14 are arranged at positions as shown in FIG. Here, 14A to 14D are supply nozzles (powder supply port 14) for powder particles to each unit jet mill from the first-stage unit jet mill to the fourth-stage unit jet mill, and 6A to 6D. (2 each) indicates a supply air (air nozzle 6) for pulverizing air to each unit jet mill.

  In the present embodiment, the two air nozzles 6 are arranged for each of the unit jet mills 38 as described above, and the corresponding two air nozzles 6 are respectively arranged on the unit jet mill 38. It is arranged at a position 180 degrees away. Such an arrangement brings about effects such as maintaining the balance of airflow.

In the lower part of the jet mill 50 in FIG. 3, a pulverized material collecting tube (exhaust air is also discharged from here) 52 that collects the pulverized material sent from each unit jet mill is provided.
Moreover, the to-be-ground object collection pipe | tube 52 is connected to suitable filtration means, such as a bag filter, and is comprised so that a predetermined to-be-ground object may be collect | recovered after isolate | separating from an airflow.

  Further, although explained later, the jet mill 50 according to the present embodiment basically includes a pulverization block in which the above-described unit jet mills are integrally connected, and another connection member on the pulverization block. It is advantageous for maintenance / inspection and the like that it is constituted by a distribution block connected by the above, and these can be easily disassembled.

  Since the jet mill according to the present embodiment is configured as described above, the pulverized particles are collectively supplied to the particle distribution device 40 and stacked from the particle distribution device 40. It is supplied to each unit jet mill substantially uniformly and can be pulverized in a processing space having a very small area as compared with the case of using a conventional jet mill.

  The above embodiment shows an example of the present invention, and the present invention is not limited to these, and appropriate changes or improvements may be made without departing from the spirit of the present invention. Needless to say.

  For example, as shown in claim 2, the present invention can be applied to the case where the powder and particle distribution device is not integrated and the powder and particle distribution device according to an appropriate method is separately arranged at an appropriate position. Can be used effectively.

1 is a plan sectional view conceptually showing a unit jet mill that constitutes a multi-stage jet mill according to an embodiment of the present invention. It is a sectional side view of the unit jet mill shown in FIG. 1 is a conceptual cross-sectional side view of a multi-stage jet mill according to an embodiment of the present invention. It is a BB arrow line view of Drawing 3, and is a top view showing the structure of the granular material distribution device of the jet mill concerning one embodiment. It is an AA arrow line view of FIG. 3, and is a top view which shows the arrangement position of the air nozzle in the unit jet mill which concerns on one Embodiment, and a granular material supply port.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Jet mill main body 4 Outer wall 6, 6A-6D Air nozzle 8 Crushing chamber 8a Crushing chamber 8b which also served as distribution chamber 10b Distribution zone 10 Upper plate 11 Support block 11a Female thread part 12 Lower plate 14, 14A-14D Powder body supply port 16 Roth 18 Air supply nozzle 20 Diffuser 22, 24 Classification ring 23 Classification ring channel (narrow path)
26 Crushing zone 28 Classification zone 30 Outlet part 32 Outlet pipe 34 Feeding pipe 38 Unit jet mill 38A Upper unit 38B-38D Intermediate part unit 38E Lower unit 40 Powder distribution device 42 Distribution mechanism 44 Powder discharge port 46 Air exhaust Outlet 50 Jet mill 52 Collected material collection tube

Claims (14)

A main body in which a disk-shaped cavity is formed;
A plurality of air nozzles disposed on the ring-shaped outer wall of the main body so as to be inclined with respect to the center of the disk-shaped cavity, and generating a high-speed air flow in the disk-shaped cavity;
A granular material distribution apparatus having a plurality of distributed granular material discharge ports provided on the lower surface of the disk-shaped cavity. A jet mill body in which a disk-shaped cavity is formed;
A plurality of air nozzles disposed on the ring-shaped outer wall of the jet mill body so as to be inclined with respect to the center of the disk-shaped cavity, and generating a high-speed air flow in the disk-shaped cavity;
Having an outlet disposed at substantially the center of the disk-shaped cavity of the jet mill body,
A plurality of stages of jet mill main bodies in which the disk-shaped cavity of the jet mill main body forms a ring-shaped pulverization zone for pulverizing powder particles by the high-speed air flow supplied from the plurality of air nozzles. As well as
A jet mill characterized in that a powder body supply port is provided in each stage of the multi-stage jet mill. A jet mill body in which a disk-shaped cavity is formed;
A plurality of air nozzles disposed on the ring-shaped outer wall of the jet mill body so as to be inclined with respect to the center of the disk-shaped cavity, and generating a high-speed air flow in the disk-shaped cavity;
An outlet disposed at a substantially center of the disk-shaped cavity of the jet mill body,
A plurality of stages of jet mill main bodies in which the disk-shaped cavity of the jet mill main body forms a ring-shaped pulverization zone for pulverizing powder particles by the high-speed air flow supplied from the plurality of air nozzles. As well as
A jet mill comprising: a powder distribution device having a powder distribution function corresponding to the number of the stacked jet mills arranged on the upper stage of the multi-layered jet mill. The jet mill according to claim 3, wherein the powder distribution device according to claim 1 is used as the powder distribution device. The jet mill main body includes a disk-shaped upper casing and a lower casing, and the ring-shaped outer wall interposed between the upper casing and the lower casing,
The jet according to any one of claims 2 to 4, wherein a lower casing of the upper jet mill and an upper casing of the lower jet mill are substantially integrated between the stacked adjacent jet mills. mill.   A pulverized granular material (a material to be crushed) that moves from the outside of the disk-shaped cavity to the inside flows into the jet mill main body at the other stage at an outlet disposed at the substantially center of the jet mill main body. The jet mill according to any one of claims 2 to 5, wherein a backflow preventing member for preventing the above is disposed.   The jet mill according to any one of claims 3 to 6, wherein a powder supply unit for each of the stacked jet mills is arranged in correspondence with a distribution powder discharge port of the powder distribution device. A jet mill body in which a disk-shaped cavity is formed;
A plurality of air nozzles disposed on the ring-shaped outer wall of the jet mill body so as to be inclined with respect to the center of the disk-shaped cavity, and generating a high-speed air flow in the disk-shaped cavity;
An outlet disposed at a substantially center of the disk-shaped cavity of the jet mill body,
A plurality of stages of jet mill main bodies in which the disk-shaped cavity of the jet mill main body forms a ring-shaped pulverization zone for pulverizing powder particles by the high-speed air flow supplied from the plurality of air nozzles. As well as
A pulverized granular material (a material to be crushed) that moves from the outside of the disk-shaped cavity to the inside flows into the jet mill main body at the other stage at an outlet disposed at the substantially center of the jet mill main body. A jet mill characterized in that a backflow preventing member for preventing the above is disposed. In addition to the above-described configuration, a ring-shaped classification zone that is disposed inside the pulverization zone and communicates with the exit space and is positioned inside the pulverization zone, and classifies objects to be pulverized by the air flow;
The jet mill according to claim 8, wherein the jet mill has a ring-shaped narrow path that is disposed between the pulverization zone and the classification zone and that divides and communicates with the pulverization zone and the classification zone.   The ring-shaped narrow path is formed by ring-shaped barriers that are respectively attached to upper and lower surfaces of the cavity substantially parallel to each other at a predetermined interval at predetermined positions in the radial direction of the disk-shaped cavity. The jet mill according to claim 9, wherein the jet mill is a ring-shaped channel. In addition to the above configuration,
The jet mill according to any one of claims 8 to 10, wherein a powder body supply port is provided in each stage of the jet mill in which the plurality of stages are stacked. In addition to the above configuration,
The powder distribution apparatus provided with the powder distribution function corresponding to the number of the stacked jet mills is arranged on the upper stage of the multi-layered jet mill. The jet mill according to any one of the above. The jet mill according to claim 12, wherein the powder distribution device according to claim 1 is used as the powder distribution device. The ring-shaped grinding zone is an internal space in which the upper surface and the lower surface of the disk-shaped cavity are asymptotic to each other toward the center, and the cavity is narrowed toward the center direction,
The ring-shaped narrow path is a ring-like shape formed between protrusions on the upper surface and the lower surface of the cavity, which are arranged at predetermined intervals at predetermined positions in the radial direction of the disk-shaped cavity. The jet mill according to any one of claims 8 to 12, which is a channel of the following.

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