JP2012200617A - Aerosol conveying flow passage and powder classifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out conversion of a circular cross section to a rectangular cross section of a flow passage or conversion of the rectangular cross section to the circular cross section of the flow passage while maintaining uniformity of flow of raw material powder at the flow passage cross section, in powder classifying processing for classifying the raw material powder conveyed in a state of being mixed with gas into a plurality of kinds of powder according to sizes or density of the powder.SOLUTION: A raw material powder flow passage for supplying having a circular flow passage cross section is connected to a raw material powder flow passage for classifying having a rectangular flow passage cross section at a classifying part via a coat hanger type flow passage. The coat hanger type flow passage converts the circular cross section to the rectangular cross section of the flow passage while maintaining uniformity of flow of aerosol at the flow passage cross section.

Description

  The present invention relates to a flow channel structure for transporting an aerosol, and in particular, separates a raw material powder (aerosol) transported in a mixed state with a gas according to the size or density (or specific gravity) of the powder. Thus, the present invention relates to a powder classification apparatus for classifying raw material powders into a plurality of types of powders.

  2. Description of the Related Art Conventionally, various types of powder classification apparatuses are known in which raw material powders are mixed and transported in a gas and classified into a plurality of types of powders according to the size or density of the powders. .

  For example, in a powder classifying apparatus that classifies raw material powder into fine powder and coarse powder, so-called fine powder containing a particle size distribution on the order of microns, for example, is handled as the raw material powder. In addition, since such a raw material powder is likely to agglomerate, a dispersion process is performed in which the raw material powder is pulverized and dispersed before the fine powder and the coarse powder are classified.

  In a powder classification system, for example, an ejector is disposed between a raw material powder input device (for example, a quantitative feeder) and a raw material powder classification device, and the raw material powder is allowed to pass through the ejector. A configuration that performs the distributed processing is conventionally known (see, for example, Patent Document 1).

  In such a conventional classification system, a disperser having an ejector is disposed at a position relatively close to the raw material powder input device, and the raw material powder in a state in which the dispersion processing is performed by the ejector passes through the inside of the pipeline. And supplied to the classifier. Therefore, in the classification device, classification processing can be performed on the raw material powder in a crushed and dispersed state.

Japanese Patent Application Laid-Open No. Sho 62-68777

  In recent years, the target of raw material powder to be classified has been diversified, and fine powder and coarse powder (or high-density powder and low-density powder) are classified with high classification accuracy from the raw material powder. There is an increasing demand to selectively and reliably take out powder having a particle size (or density) in the range. In addition to such improvement in classification accuracy, it is also required to improve the classification processing capability.

  In order to improve the processing capacity in the classification system, it is preferable to use a classification device having a rectangular channel cross section. In general, the raw material powder is often supplied to the classifier through a circular channel (pipe) having a smaller surface area on the inner wall surface of the channel than other shapes. Therefore, in order to improve the accuracy in addition to the classification processing capacity, the circular flow channel cross section is smoothly converted to the rectangular flow channel cross section, and the uniformity of the raw material powder flow in the flow channel cross section is maintained. There is a need. In addition, it is desirable to maintain the uniformity of the aerosol flow during such a change in the shape of the cross-section of the flow path in the transportation of the aerosol other than the raw material powder.

Accordingly, an object of the present invention is to solve the above-mentioned problem, and the raw material powder conveyed in a mixed state with a gas is divided into a plurality of types of powders according to the size or density (or specific gravity) of the powder In the powder classification process to classify the flow path, change the flow path cross section from a circular shape to a rectangular shape, or convert the flow path cross section from a rectangular shape to a circular shape. An object of the present invention is to provide a powder classifying apparatus that can be carried out while maintaining.
Moreover, the objective of this invention is providing the flow path for aerosol conveyance which can perform such conversion of a flow-path cross section.

  In order to achieve the above object, the present invention is configured as follows.

  According to the first aspect of the present invention, the first aerosol channel having a circular channel cross section, the second aerosol channel having a rectangular channel cross section, the first aerosol channel and the second aerosol channel, The coat hanger type flow path and the coat hanger type flow path connecting the circular flow path cross section to the rectangular flow path cross section or the rectangular flow path while maintaining the uniformity of the aerosol flow in the flow path cross section Provided is an aerosol transport channel that converts a channel cross section from a cross section to a circular channel cross section.

  According to the second aspect of the present invention, in the powder classification apparatus for classifying the raw material powder supplied in a mixed state with the gas into the first powder and the second powder using inertial force, a rectangular shape is provided. The raw material powder channel for classification having a cross-sectional channel section is branched into a first powder channel and a second powder channel each having a rectangular channel cross section, and the raw material powder is divided into the first powder. A classification part for classifying the body and the second powder, a feed raw material powder channel having a circular channel cross section, and a coat connecting the feed raw material powder channel and the classification raw material powder channel A hanger-type channel, and the coat hanger-type channel is a powder that converts a channel cross-section from a circular channel cross-section to a rectangular channel cross-section while maintaining the uniformity of the aerosol flow in the channel cross-section. A body classification device is provided.

  According to the third aspect of the present invention, in the powder classifying apparatus for classifying the raw material powder supplied in a mixed state with the gas into the first powder and the second powder using the inertial force, a rectangular shape is provided. The raw material powder channel for classification having a cross-sectional channel section is branched into a first powder channel and a second powder channel each having a rectangular channel cross section, and the raw material powder is divided into the first powder. A classification part for classifying the body and the second powder, a recovery powder channel having a circular channel cross section, a first powder channel or a second powder channel, and a recovery powder channel A coat hanger-type flow path connecting the flow path from the rectangular flow path cross section to the circular flow path cross section while maintaining the uniformity of the aerosol flow in the flow path cross section. Provided is a powder classification device for converting

  According to the fourth aspect of the present invention, the powder according to the second aspect or the third aspect, wherein a connected flow path in which a plurality of coat hanger type flow paths are connected by a tournament method is used as the coat hanger type flow path. A body classification device is provided.

  According to the fifth aspect of the present invention, a plurality of coat hanger-type channels are connected by a tournament method so that one side of each rectangular channel cross section of adjacent coat hanger-type channels is in contact with the connected channel. The powder classifying apparatus according to the fourth aspect is provided.

  According to the sixth aspect of the present invention, the coat hanger type flow path has a shape in which the thickness of the flow path cross section at both edge portions is larger than the thickness of the flow path cross section at the center part and is symmetrical with respect to the center of the flow path cross section A powder classifying apparatus according to any one of the second to fifth aspects is provided.

  According to one aspect of the present invention, a first aerosol channel having a circular channel cross section and a second aerosol channel having a rectangular channel cross section are connected by a coat hanger type channel, and a coat hanger type The channel converts the channel cross section from the circular channel cross section to the rectangular channel cross section while maintaining the uniformity of the aerosol flow in the channel cross section. Further, the channel cross section is converted from the rectangular channel cross section to the circular channel cross section. Therefore, the shape of the channel cross section can be smoothly changed between a circular shape and a rectangular shape while maintaining the uniformity of the aerosol flow in the channel cross section.

  According to another aspect of the present invention, the feed raw material powder channel having a circular channel cross section and the classification raw material powder channel having a rectangular channel cross section in the classification section are coated hanger type channels. The coat hanger type channels convert the channel cross section from the circular channel cross section to the rectangular channel cross section while maintaining the uniformity of the aerosol flow in the channel cross section. Therefore, the processing capability can be improved by adopting a rectangular channel cross section in the classification part. At the same time, the shape of the cross section of the flow path can be smoothly changed between a circular shape and a rectangular shape while maintaining the uniformity of the flow of the raw material powder in the cross section of the flow path, and the classification accuracy in the classification section can be improved.

The flowchart of the powder classification system concerning one embodiment of the present invention FIG. 2 is an external front view of a powder classification apparatus according to an embodiment of the present invention. External view of powder classification apparatus according to an embodiment of the present invention Exploded view of a powder classifier according to an embodiment of the present invention Schematic diagram of each flow in the powder classification apparatus of the embodiment of the present invention External side view of classification unit according to an embodiment of the present invention AA line sectional view of a classification part of Drawing 5A FIG. 1 is an external view and a cross-sectional view of a coat hanger type flow channel according to an embodiment of the present invention. Sectional view (upstream side) of coat hanger type flow path of FIG. Sectional view (middle part) of coat hanger type flow path of FIG. Sectional view (downstream side) of coat hanger type flow path of FIG. External view and cross-sectional view of a coat hanger type channel according to a modification of the embodiment of the present invention The schematic diagram of the coat hanger type channel concerning the modification of an embodiment of the invention

  Embodiments according to the present invention will be described below in detail with reference to the drawings.

  A main configuration of a powder classification system including a powder classification apparatus according to an embodiment of the present invention will be described with reference to the flowchart shown in FIG.

  As shown in FIG. 1, a powder classification system 1 includes a quantitative feeder 2, a disperser 3, a powder classification device 4, a fine powder collecting bag filter 5, a coarse powder collecting bag filter 6, and a vacuum. A pump 7 and a clean air supply unit 8 are provided.

  In the powder classification system 1 according to the present embodiment, the raw material powder having a particle size distribution of 0.1 μm to several tens of μm, for example, is conveyed in a mixed state (that is, a solid-gas mixed state). Then, fine powder (second powder: for example, particle diameter of about 0.1 μm to 1 μm) and coarse powder (first powder: for example, particle diameter exceeding 1 μm) are classified and collected by the powder classifier 4. System.

  Such raw material powders are used in various technical fields such as fine ceramics, metal materials, polymer materials, batteries / electronic materials, composite materials, pharmaceutical materials, food materials, etc., such as electronics, energy, medicine, and food. It is intended for inorganic and organic fine powders. The process of selectively taking out powder having specific specifications (size, density, etc.) from the raw material powder is the powder classification process of the present invention. Further, the process of removing foreign substances other than the powder having a specific specification contained in the raw material powder from the raw material powder is also included in the powder classification process of the present invention.

  The quantitative feeder 2 is a device that quantitatively supplies the raw material powder into the powder classification system 1. In the present embodiment, for example, a micro feeder is used.

  The disperser 3 includes an ejector, and pulverizes and disperses the raw material powder supplied by the quantitative feeder 2 through the ejector. The disperser 3 may be an apparatus having a function of crushing and dispersing the raw material powder as described above, and a configuration other than the ejector may be employed.

  The powder classifier 4 is an apparatus that selectively classifies the raw material powder dispersed in the disperser 3 and conveyed in a mixed state with gas into fine powder and coarse powder using inertial force. is there. The powder classifying device 4 includes a dispersing unit 9 and a classifying unit 10. After the dispersion processing is performed again on the raw material powder supplied into the device by the dispersing unit 9, the classifying unit 10 is provided. Classification is performed at In addition, a clean air supply unit 8 is connected to the powder classifier 4 so that clean air is supplied into the apparatus. Since the classification process is performed in the classification unit 10 in a state where the raw material powder is surrounded by the flow of clean air supplied from the clean air supply unit 8, the raw material powder adheres to the inner wall surface of the classification unit 10. Is prevented, and high classification accuracy can be obtained. The detailed configuration of the powder classifier 4 will be described later.

  The fine powder collecting bag filter 5 collects fine powder by filtering the powder airflow containing the fine powder classified by the powder classifying device 4. Similarly, the coarse powder collecting bag filter 6 collects the coarse powder by filtering the powder airflow containing the coarse powder classified by the powder classifier 4.

  As shown in FIG. 1, in the powder classification system 1, each of the above-described device configurations is connected by a pipe line (pipe for conveying raw material powder). The vacuum pump 7 is connected to the downstream end of the entire pipe line of the powder classification system 1. By sucking the inside of the pipe line, the inside of the pipe line is maintained at a negative pressure, and is caused by the air flow of the raw material powder. Transport is performed. In this embodiment, an example in which a vacuum suction conveyance method using the vacuum pump 7 is adopted will be described. However, other methods may be adopted as the raw material powder conveyance method, for example, compressed air is used. A pressure feeding method may be adopted.

  Opening control valves 5a and 6a, flow meters 5b and 6b, and pressure gauges 5c and 6c are provided on the outlet pipes of the fine powder collecting bag filter 5 and the coarse powder collecting bag filter 6, respectively. . In addition, an opening adjustment valve 8a, a flow meter 8b, and a pressure gauge 8c are also provided on the pipeline of the clean air supply unit 8. The balance of each flow of clean air, fine powder, and coarse powder can be controlled by adjusting each opening degree control valve so that each flow meter and pressure gauge show appropriate values.

  Next, the configuration of the powder classifier 4 will be described with reference to the drawings. An external view (front view) of the powder classifier 4 is shown in FIG. 2A, an external view (side view) is shown in FIG. 2B, and an exploded view is shown in FIG. In addition, in the exploded view of FIG. 3, it has shown about the main structural members in the structural member shown to the external view of the powder classification apparatus 4 of FIG. 2A and 2B.

  As shown in FIGS. 2A, 2B and 3, the powder classifier 4 includes a raw material powder introducing section 11, a dispersion plate pressing member 12, a dispersion plate 13, a dispersion plate receiving member 14, and a current plate 15. A rectifying plate pressing member 16, a merging portion 17, a separating portion 18, a clean air introducing portion 19, a fine powder discharging portion 20, and a coarse powder discharging portion 21.

  The raw material powder introduction unit 11 serves as an inlet for raw material powder conveyed from the quantitative feeder 2 and the disperser 3 via a pipeline. The raw material powder introducing section 11 has a so-called coat hanger type flow path for converting a flow path of the raw material powder having a circular cross section, which is a connection portion with the pipe, into a flow path having a rectangular cross section.

  In the present embodiment, the dispersion plate 9 and the dispersion plate holding member 12 and the dispersion plate receiving member 14 that hold the dispersion plate 13 so as to sandwich the dispersion plate 13 from the upstream side and the downstream side constitute the dispersion portion 9. The dispersion plate pressing member 12 is connected to the raw material powder introduction unit 11, and the raw material powder is supplied to the dispersion unit 9 in a rectangular cross-section flow from the raw material powder introduction unit 11. The dispersion plate 13 has a configuration in which a plurality of ejectors are arranged adjacent to each other in a horizontal row, and has a function of crushing and dispersing the raw material powder by passing the raw material powder through each ejector.

  The clean air introduction unit 19 is connected to the clean air supply unit 8 through a pipe line and serves as a clean air introduction port in the powder classifier 4. The dispersion plate pressing member 12 and the rectifying plate pressing member 16 form a clean air flow path connected to the clean air introducing portion 19. The clean air channel surrounds the entire outer periphery of the raw material powder channel of the dispersion unit 9 and is formed as a channel separated from the raw material powder channel. A rectifying plate 15 is disposed in the clean air flow path, and the rectifying plate 15 is sandwiched and held by the dispersion plate pressing member 12 and the rectifying plate pressing member 16 from the upstream side and the downstream side. The rectifying plate 15 is configured by laminating a net-like metal member, for example.

  The merging portion 17 is connected to the dispersion plate receiving member 14, has a raw material powder flow path inside thereof, and is disposed inside the separation portion 18, thereby providing a raw material powder between the inner wall surface of the separation portion 18 and the raw material powder. A clean air channel surrounding the body channel is formed. The raw material powder flow path and the clean air flow path are communicated with each other at the downstream end of the merging portion 17, and a clean air flow surrounding the flow of the raw material powder is formed in the separation portion 18.

  In particular, as shown in FIG. 2B, in the separation unit 18, the raw material powder flow path 22 heading downward in the figure is branched into a coarse powder flow path 24 (first powder flow path) heading downward substantially in the lateral direction. Branching into a fine powder passage 23 (second powder passage). At the branch portion of the flow path, the raw material powder is classified using inertia, and the fine powder flow and the coarse powder flow are separated. In the present embodiment, the classification unit 10 is configured by the merging unit 17 and the separation unit 18. The detailed configuration of the classification unit 10 will be described later.

  The fine powder flow path 23 of the separation unit 18 is connected to the fine powder discharge part 20, and the coarse powder flow path 24 is connected to the coarse powder discharge part 21. Further, the fine powder discharge unit 20 is connected to the fine powder collecting bag filter 5 through a pipe line, and the coarse powder discharge unit 21 is connected to the coarse powder collecting bag filter 6 through a pipe line.

  Here, each flow path, such as raw material powder and clean air, in the powder classifier 4 is schematically shown in FIG.

  As shown in FIG. 4, the flow path of the raw material powder supplied to the powder classifier 4 is changed from the circular cross-section flow path 25 to the rectangular cross-section flow path 26 in the raw material powder introduction section 11. It is converted and guided to the dispersion plate 13. The raw material powders that have passed through the respective ejectors in the dispersion plate 13 are discharged to the flow path 27 having a rectangular cross section in the merging portion 17 (and the dispersion plate receiving member 14).

  On the other hand, the clean air supplied from the clean air introduction unit 19 to the powder classifier 4 is a flow channel having a frame cross section surrounding the raw material powder flow channel 26 having a rectangular cross section in the dispersion plate pressing member 12. 28 and led to the outer periphery of the merging portion 17.

  At the outer periphery of the merging portion 17, the outer diameter of the clean air passage 28 having a frame-shaped cross section is narrowed toward the downstream side, and the raw material powder passage 27 and the clean air passage 28 are formed at the tip of the merging portion 17. The material powder flow path 22 is formed by merging and the entire outer periphery thereof being surrounded by clean air.

  Thereafter, in the separation unit 18, the raw material powder channel 22 is branched into a fine powder channel 23 and a coarse powder channel 24, and the raw material powder is classified into a fine powder and a coarse powder at this branch portion. .

  Next, the detailed configuration of the classifying unit 10 (the merging unit 17 and the separating unit 18) will be described with reference to FIGS. 5A and 5B. 5A is an external side view of the classifying unit 10, and FIG. 5B is a cross-sectional view taken along line AA in FIG. 5A.

  As shown in FIGS. 5A and 5B, the classifying unit 10 is configured by inserting and merging the merging unit 17 into the internal space of the separating unit 18. The merging portion 17 has a raw material powder passage 27 penetrating in the vertical direction at the center thereof, and the raw material powder from the dispersion portion 9 is supplied into the separation portion 18 through the raw material powder passage 27. . Further, a clean air flow path 28 having a frame-like cross section is formed between the outer wall portion of the merging portion 17 and the inner wall portion of the separation portion 18, and the outer periphery of the flow of the raw material powder supplied into the separation portion 18 Clean air is supplied into the separation unit 18 through the clean air channel 28 so as to surround the whole. Note that the airflow in the clean air channel 28 is rectified when passing through the rectifying plate 15, and the turbulence of the airflow is suppressed.

  A raw material powder flow path 22 having a rectangular cross section is formed at a joining portion of the raw material powder and clean air in the separation unit 18. The raw material powder flow path 22 is branched at a branch portion 30 into a coarse powder flow path 24 and a fine powder flow path 23 having a rectangular cross section.

  As shown in FIG. 5A, the raw material powder flow path 22 in the rectangular cross section is formed by the first wall portion (wall surface) and the second wall portion (wall surface) facing each other, which are inner walls in the separation portion 18. The long side of is defined. A rectangular opening 33 is formed in the first wall portion at the branch portion 30 (see in particular FIG. 5B), and the fine powder passage 23 is communicated with the raw material powder passage 22 through the opening 33. ing. Further, the first wall portion and the second wall portion extend further downward in the drawing than the branch portion 30, and the long sides in the rectangular cross section of the coarse powder flow path 24 are the first wall portion and the second wall. It is demarcated by the part.

  4 and 5B, when the width of the long side direction of the coarse powder flow path 24 extends downward in the figure in a substantially constant state, that is, when it extends as a linear flow path. It is described as an example. Note that the form of the coarse powder channel 24 is not limited to a linear channel, and is narrowed so that the width in the long side direction decreases downward as shown in FIGS. 2A and 3, for example. A flow path may be used. Moreover, it is good also as a flow path narrowed after that as a linear flow path only for predetermined distance.

  Next, the raw material powder introducing section 11 in the powder classifying device 4 will be described in detail. As described above, the raw material powder introduction unit 11 converts the circular cross-section flow path 25 into the rectangular cross-section flow path 26 and introduces the flow of the raw material powder having the rectangular cross-section into the dispersion plate 13. The so-called coat hanger type flow path is configured. Here, a flow path forming member 51 that forms a coat hanger type flow path in the raw material powder introducing portion 11 is shown in FIG. In addition, when the two flow path forming members 51 shown in FIG. 6 are overlapped with each other, the coat hanger type flow path 50 is formed inside thereof.

  6A is a front view of the flow path forming member 51 (flow path forming side), FIG. 6B is a top view, FIG. 6C is a bottom view, and FIG. 6D is a cross-sectional view taken along line BB in FIG. The figure and (E) show the CC sectional view taken on the line in (A). 7A to 7C are cross-sectional views (cross-sections orthogonal to the flow direction) of the coat hanger type flow channel 50 formed by overlapping two flow channel forming members 51 shown in FIG. Show. 7A is a cross-sectional view corresponding to the cross section along line DD in FIG. 6A, FIG. 7B is a cross-sectional view corresponding to the cross section along line EE in FIG. 6A, and FIG. FIG. 7 is a cross-sectional view corresponding to a cross section taken along line FF in FIG.

  As shown in FIG. 6, the flow path forming member 51 has a generally triangular flow path (coat hanger type flow path) in a front view in which a circular cross-section flow path 25 is converted into a rectangular cross-section flow path 26. 50 is formed. By this generally triangular channel 50, the channel width in the circular cross-sectional channel 25 is expanded to be the channel width in the rectangular cross-sectional channel 26 larger than the channel width. The expansion angle (generally triangular apex angle) of the channel 50 is set to an acute angle, for example.

  As shown particularly in FIG. 6 (A), the flow path forming member 51 includes a flat portion 52 formed as a triangular plane in plan view at the center portion of the flow path 50, and along both end portions of the flat portion 52. Defined by the groove 53 formed in the above manner. As shown in FIG. 6E, each groove 53 is formed deeper than the flat portion 52. Further, as shown in FIG. 6A, each groove 53 is formed so that its width decreases as it goes from the upstream side to the downstream side. The groove 53 terminates in front.

  The cross-sectional shape of the flow path 50 is a circular cross section in the upstream portion as shown in FIG. 7A, and a rectangular cross section in the downstream portion as shown in FIG. 7C. Further, in the intermediate portion between the upstream portion and the downstream portion, as shown in FIG. 7B, the opposite end portions of the rectangular channel 54 defined by the opposed flat portions 52 are defined by the opposed groove portions 53. It has an integral cross-sectional shape in which a rectangular channel 55 is disposed. The thickness D1 of the flow path 55 on both edge sides is formed larger than the thickness D2 of the flow path 54 on the center side, and the flow path 50 has a symmetrical shape with respect to the center of the cross section of the flow path.

  In such a coat hanger type flow channel 50, there is no significant difference in pressure loss between the flow passing through the central portion of the flow channel 50 and the flow passing through the edge portion from the inlet to the outlet of the flow channel 50. The cross-sectional shape is set as follows. Therefore, in the coat hanger type flow path 50, the flow of the raw material powder introduced in the flow path 25 having a circular cross section is changed from a circular shape to a rectangular flow while maintaining the flow uniformity in the cross section of the flow path. It is possible to form a flow of raw material powder that gradually transforms and finally matches the flow path 26 having a rectangular cross section. Therefore, the raw material powder can be introduced into the dispersion plate 13 while maintaining the uniformity of the flow of the raw material powder, and the dispersion plate 13 can perform an efficient dispersion process. Moreover, since the flow of the raw material powder subjected to such a dispersion treatment can be introduced into the classification unit 10 through the raw material powder flow path 27 having a rectangular cross section, the classification unit 10 generates a uniform raw material powder. Since classification processing can be performed on the flow, classification accuracy can be improved.

  In addition, the coat hanger type flow path 50 of this Embodiment is not limited only to the above structures, Various other structures can be employ | adopted. For example, as shown in FIGS. 8A to 8C, a connection channel 60 in which two coat hanger type channels having the same shape are connected by a tournament method may be used. 8A is a front view of the connection channel 60, FIG. 8B is a top view of the connection channel 60, and FIG. 8C is a cross-sectional view taken along the line GG in the connection channel 60 of FIG. is there.

  Specifically, as shown in FIG. 8, the connection channel 60 is formed by overlapping two channel forming members 61 so as to face each other. The coat hanger type flow channel 50 described in FIG. 6 is disposed adjacent to the flow channel forming member 61 (the same components as those of the flow channel 50 in FIG. (The explanation is omitted.) Furthermore, the circular cross-section flow paths 62 that are the inlets of the two coat hanger-type flow paths 50 are connected as one circular cross-section flow path 25 on the upstream side. Further, the rectangular cross-section flow paths 63 that are the outlets of the two coat hanger-type flow paths 50 are arranged adjacent to each other so that one side of the rectangular cross-section is in contact with the downstream side. Therefore, the flow of the raw material powder discharged from each flow path 63 can be integrated. Moreover, the connection flow path 60 is formed in the symmetrical shape with respect to the center of the cross section.

  In this way, in the connection channel 60 in which a plurality of coat hanger type channels are connected by the tournament method, a relatively large flow rate is maintained with a short channel length, while maintaining a uniform flow, To a channel having a rectangular cross section. Therefore, it is effective to apply such a connection channel 60 to a channel having a large aspect ratio (ratio of long side length to short side length) of the rectangular channel cross section. Also, considering the symmetry of the flow path, that is, the uniformity of pressure loss at each position of the flow path cross section, the number of coat hanger type flow paths connected by the tournament method is a multiplier of 2 (for example, 2) The number is preferably 4 or 8).

  In addition, in FIG. 8, although the case where the coat hanger type flow path 50 of the same shape was connected by a tournament system was demonstrated, when connecting by a tournament system, the coat hanger type flow path of the same shape is not necessarily required. Not only the case of using but also the case of using a different shape may be used. For example, in consideration of the flow inertia of the raw material powder, the difference in flow resistance may be set individually between each flow path or between the pair of grooves 53 so that the flow is uniform. For example, a specific description will be given using a connection channel 70 in which four coat hanger type channels 50 shown in FIG. 9 are connected by a tournament method. In addition, in FIG. 9, each flow path, a coat hanger type flow path, etc. are shown typically.

  As shown in FIG. 9, the connection channel 70 has a configuration in which four coat hanger type channels 50A to 50D are connected by a tournament method. One circular cross-section flow path 71 in the uppermost stream is branched into two circular cross-section flow paths 72A and 72B, and each of the flow paths 72A and 72B has two circular cross-section flow paths 73A to 73D. (I.e., a total of four flow paths), and the individual flow paths 73A to 73D are connected to the inlets of the four coat hanger type flow paths 50A to 50D.

  In the connection flow path 70 having such a configuration, since the flow path is branched, the flow path after being branched is affected by inertia due to the flow before branching. For example, referring to the branch from the flow path 72A to the flow paths 73A and 73B, the raw material powder flows more easily in the flow path 73A than in the flow path 73B due to the influence of the flow inertia in the flow path 72A. In addition, the flow of the raw material powder introduced from the flow path 73A into the coat hanger type flow path 50A is affected by the inertia of the flow in the flow path 73A, so that the gap between the left and right groove portions 53a and 53b is greater than that of the groove portion 53b. The raw material powder flows more easily in the groove 53a. Furthermore, between the four coat hanger-type channels 50A to 50D, the raw material powder flows more easily in the channels 50A and 50D than in the channels 50B and 50C.

  In consideration of the influence of the flow inertia, the flow path 73A is set to be smaller than the flow path cross-sectional area of the flow path 73B to provide flow resistance. The flow can be made uniform. Further, in the coat hanger type flow channel 50A, each flow can be made uniform by setting the flow channel cross-sectional area of the groove 53a smaller than the flow channel cross-sectional area of the groove 53b. Further, in the four coat hanger-type channels 50A to 50D, the channel cross-sectional areas (opening surface areas) of the channels 63A to 63D having rectangular cross-sections that are the respective outlets are represented by the channels 63A and 63D. , 63C can be set smaller than each other, so that each flow can be made uniform.

  In particular, since the flow of the raw material powder is a low-viscosity and high-speed flow, the flow can be made uniform by adjusting the cross-sectional area of each channel without using a flow rate adjusting device such as a valve. Is preferred.

  In the above description, the case where the channel shape is converted from the circular channel cross section to the rectangular channel cross section using the coat hanger type channel has been described as an example. In FIG. 5, the upstream side and the downstream side may be used in opposite directions to convert the channel shape from a rectangular channel section to a circular channel section. For example, after the raw material powder is classified, such a coat hanger type flow path is connected to the fine powder flow path 23 or the coarse powder flow path 24 having a rectangular flow path cross section so that the circular flow The flow path shape can be converted into a road cross section. In addition, the connection channel adopting the tournament method may be used in the reverse direction as described above.

  Further, in the above-described embodiment, the pipe line connected to the inlet of the coat hanger type flow path 50 (circular cross-sectional flow path) supplies the raw material powder flow for supplying the raw material powder to the powder classifier 4. The pipes (circular cross-section flow paths) heading to the bag filters 5 and 6 connected to the fine powder flow path 23 and the coarse powder flow path 24 are classified by the powder classifying device 4. This is a collecting powder passage for collecting the collected powder. Further, the flow paths 22, 26, 27 having a rectangular cross section located upstream from the branch portion 30 branched into the fine powder flow path 23 and the coarse powder flow path 24 are classified raw material powder flow paths. It has become.

  In the present embodiment, the powder classification device 4 is provided with a dispersion unit 9 as an example. However, the coat hanger type flow channel of the present invention is also applied to a powder classification device without a dispersion unit. it can. That is, the raw material powder flow converted into the rectangular channel cross section in the coat hanger type channel may be directly introduced into the classification unit 10.

  In the above-described embodiment, the powder classification device 4 separates the raw material powder according to the powder size and classifies it into coarse powder (first powder) and fine powder (second powder). However, the powder classification device of the present invention is not limited to such a case. In the powder classifying apparatus of the present invention, the raw material powder is separated according to the powder density, and the raw material powder is divided into a high density powder (first powder) and a low density powder (second powder). It may be a case where classification is performed.

  Further, the coat hanger type flow path of the present invention is not limited to the case where it is applied to a powder classifier, but is also applicable to an aerosol flow (aerosol transfer flow path) other than the above-described raw material powder flow. Can do.

  It is to be noted that, by appropriately combining arbitrary embodiments of the various embodiments described above, the effects possessed by them can be produced.

DESCRIPTION OF SYMBOLS 1 Powder classification system 2 Fixed quantity feeder 3 Dispersing machine 4 Powder classification apparatus 5 Bag filter for fine powder collection 6 Bag filter for coarse powder collection 7 Vacuum pump 8 Clean air supply part 9 Dispersing part 10 Classifying part 13 Dispersing plate 17 Junction part 18 Separation part 22 Raw material powder flow path 23 Fine powder flow path 24 Coarse powder flow path 30 Branching portion 33 Opening part 50 Coat hanger type flow path 51 Flow path forming member 52

Claims (6)

A first aerosol channel having a circular channel cross section;
A second aerosol channel having a rectangular channel cross section;
A coat hanger type channel connecting the first aerosol channel and the second aerosol channel;
The coat hanger type flow path is a flow path from a circular flow path cross section to a rectangular flow path cross section or from a rectangular flow path cross section to a circular flow path cross section while maintaining the uniformity of the aerosol flow in the flow path cross section. Aerosol flow path that converts the cross section. In a powder classification apparatus for classifying raw material powder supplied in a mixed state with gas into a first powder and a second powder using inertial force,
The raw material powder channel for classification having a rectangular channel cross section is branched into a first powder channel and a second powder channel having a rectangular channel cross section, and the raw material powder is divided into the first powder channel and the first powder channel. A classification part for classifying the powder and the second powder;
A raw material powder channel for supply having a circular channel cross section;
A coat hanger type channel connecting the raw material powder channel for supply and the raw material powder channel for classification;
The coat hanger type flow path is a powder classification device that converts the flow path cross section from the circular flow path cross section to the rectangular flow path cross section while maintaining the uniformity of the aerosol flow in the flow path cross section. In a powder classification apparatus for classifying raw material powder supplied in a mixed state with gas into a first powder and a second powder using inertial force,
The raw material powder channel for classification having a rectangular channel cross section is branched into a first powder channel and a second powder channel having a rectangular channel cross section, and the raw material powder is divided into the first powder channel and the first powder channel. A classification part for classifying the powder and the second powder;
A collecting powder channel having a circular channel cross section;
A coat hanger type flow path connecting the first powder flow path or the second powder flow path and the recovery powder flow path,
The coat hanger type flow path is a powder classification device that converts the flow path cross section from the rectangular flow path cross section to the circular flow path cross section while maintaining the uniformity of the aerosol flow in the flow path cross section.   The powder classification apparatus according to claim 2 or 3, wherein a connection channel in which a plurality of coat hanger channels are connected by a tournament method is used as the coat hanger channel.   The plurality of coat hanger-type channels are connected by a tournament method so that one side of each rectangular channel cross section of adjacent coat hanger-type channels is in contact with each other in the connection channel. Powder classifier.   6. The coat hanger type channel has a thickness of a channel cross section at both edge portions larger than a thickness of a channel cross section of a central portion, and has a symmetrical shape with respect to the center of the channel cross section. The powder classification apparatus as described in any one.

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