JP2012081642A - Fine powder removing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fine powder removing apparatus which can freely design the shape of the apparatus and lengthen the retention time of an air-fuel mixture on a filter face.SOLUTION: The fine powder removing apparatus includes: an inner cylinder 10; and an outer cylinder 20. At least a part of an overlapping part with the sidewall of the outer cylinder 20 in the axial direction of the central axis 11 of the inner cylinder 10 of the sidewall of the inner cylinder 10 is made to be a porous filter 30, and an inlet pipe 60 for making an air-fuel mixture 3 of air 1 and pellets 2 flow into the inner cylinder 10 is provided, and an outlet pipe 70 for making the air 1 passing through filter holes 31 with the fine powder 4 included in the air-fuel mixture 3 flowed into the inner cylinder 10 flow out to the outside of the outer cylinder 20 is provided. The filter holes 31 are formed into long holes in which the length direction is a direction intersecting at right angles to the central axis 11 of the inner cylinder 10.

Description

  The present invention relates to a fine powder removing apparatus for removing fine powder from a granular material.

  An example of a mechanism for removing fine powder from a granular material is disclosed in Patent Documents 1 and 2. In this mechanism, a supply pipe is provided above a cylindrical casing, a suction pipe is provided below the casing, and a cylindrical filter having a net-like side wall is provided in the casing. A supply pipe is connected to a material tank containing plastic resin pellets (an example of a granular material) with a hose or pipe, and a suction pipe is connected to the suction blower with a hose or pipe. A mixture of pellets and air (an example of particulate transport gas) flows from the supply pipe and descends while swirling along the inner wall of the filter, and adheres to the pellets due to the centrifugal force generated by this spiral flow. The powder (an example of fine powder) and pellets are separated into the inside and outside of the side wall of the filter, the air containing the powder is discharged from the suction pipe, and the pellet from which the powder has been removed falls from the opening at the lower end of the filter.

  In Patent Document 2, the air suction port that is a suction pipe has a larger diameter than the powder body suction port that is a supply pipe, and the distance from the center of the casing is the distance between the center of the casing and the powder body suction port. By providing it so that it is larger than the distance to the installation position, the flow of the air-fuel mixture flowing along the inner wall of the filter is spiraled, and the residence time of the air-fuel mixture on the filter surface is increased. By arranging the elongated filter holes along the flow of the air-fuel mixture that flows spirally along the inner wall (which is an uncontrolled “free flow”), the fibrous and rod-like objects can also be powdered. Suggest separation from the body.

JP 2007-50354 A JP 2009-273969 A

  When the fine powder is removed from the granular material as described above, the removal efficiency of the fine powder increases if the residence time of the air-fuel mixture on the filter surface can be increased. However, the technique disclosed in Patent Document 2 has a problem that the shape of the apparatus is restricted.

  An object of the present invention is to provide a fine powder removing device that can freely design the shape of the device and can increase the residence time of the air-fuel mixture on the filter surface.

  In order to achieve the above object, the present invention includes, as a first invention, an inner cylinder and an outer cylinder disposed outside the inner cylinder, the axial direction of the central axis of the inner cylinder among the side walls of the inner cylinder At least a part of a portion that overlaps the side wall of the outer cylinder is a porous filter, and an inflow port is provided in the inner cylinder to allow a mixture of the transport gas of the granular material and the granular material to flow in. In the fine powder removing apparatus, wherein the fine gas contained in the air-fuel mixture that has flowed into the air-fuel mixture is provided with an outflow port through which the transport gas passing through the filter hole flows out of the outer cylinder, the spiral is formed along the inner wall of the filter. A guide is provided for guiding the free flow of the air-fuel mixture flowing in one direction from a direction closer to a direction perpendicular to the central axis of the inner cylinder to a direction perpendicular to the central axis of the inner cylinder than the free flow direction. With the characteristics There is provided a that fines removal apparatus.

  As a second invention, in the first invention, the guide guides the free flow of the air-fuel mixture flowing spirally along the inner wall of the filter in a direction perpendicular to the central axis of the inner cylinder. A fine powder removing device is provided.

  As a third invention, an inner cylinder and an outer cylinder disposed outside the inner cylinder are provided, and at least a portion of the side wall of the inner cylinder that overlaps the side wall of the outer cylinder in the axial direction of the central axis of the inner cylinder. A part of the filter is a porous filter, and an inflow port is provided in the inner cylinder for injecting a mixture of the particulate transport gas and the granules, and the fine powder contained in the mixture flowing into the inner cylinder In addition, in the fine powder removing device provided with an outflow port for allowing the transport gas passing through the filter hole to flow out of the outer cylinder, the filter hole is a long hole whose length direction is a direction perpendicular to the central axis of the inner cylinder It is an object of the present invention to provide a fine powder removing device characterized in that it is formed in the above.

  As a fourth invention, in any one of the first to third inventions, when the central axis of the inner cylinder is a vertical line, the filter is formed in a constricted shape downward vertically. The fine powder removal apparatus characterized by these is provided.

  According to the first invention, the filter is provided with a guide, and the guide allows the free flow of the air-fuel mixture flowing spirally along the inner wall of the filter to a direction perpendicular to the central axis of the inner cylinder rather than the free flow direction. By guiding in one direction from a direction close to 1 to a direction perpendicular to the central axis of the inner cylinder, the flow of the air-fuel mixture in the filter can be a spiral with a small lead angle. Therefore, it is possible to provide a fine powder removing device that can freely design the shape of the device and can increase the residence time of the air-fuel mixture on the filter surface.

  According to the second invention, the guide is provided in the filter, and by the guide, the free flow of the air-fuel mixture flowing spirally along the inner wall of the filter is guided in the direction perpendicular to the central axis of the inner cylinder, The flow of the air-fuel mixture in the filter can be spiral with a smaller lead angle. Therefore, the residence time of the air-fuel mixture on the filter surface can be further increased.

  According to the third invention, the filter hole is formed in a long hole whose length direction is a direction perpendicular to the central axis of the inner cylinder, so that the air-fuel mixture flowing spirally along the inner wall of the filter is centrifuged. Because the force is working, the granular material in the mixture moves along the length side of the filter hole in the filter, and the free flow of the mixture flowing spirally along the inner wall of the filter It is guided in the length direction. Thus, the filter hole functions as a guide for guiding the free flow of the air-fuel mixture flowing spirally along the inner wall of the filter in the direction perpendicular to the central axis of the inner cylinder, and the flow of the air-fuel mixture in the filter is controlled by the lead angle. Furthermore, since the flow of the air-fuel mixture in the filter can be a spiral with a smaller lead angle, the residence time of the air-fuel mixture on the filter surface can be further increased. Therefore, it is possible to provide a fine powder removing device that can freely design the shape of the device and can increase the residence time of the air-fuel mixture on the filter surface.

  According to the fourth invention, when the central axis of the inner cylinder is a vertical line, the filter is formed so as to be narrowed vertically downward so that the length direction serves as a guide provided in the filter. A filter hole formed in a long hole that is one direction from a direction closer to a direction perpendicular to the central axis of the inner cylinder to a direction perpendicular to the central axis of the inner cylinder than the free flow direction of the air-fuel mixture flowing spirally along When a filter hole formed in a long hole that is perpendicular to the central axis of the inner cylinder is adopted, the lower side of the filter hole in the length direction is closer to the central axis of the inner cylinder than the upper side, and the granular material is The certainty of hitting the lower side of the filter hole is increased, and the guide function by the filter hole can be effectively exhibited.

It is a figure which shows the whole structure of the fine powder removal apparatus of Example 1 of this invention. It is a figure which shows the external appearance of the fine powder removal apparatus of Example 1, (A) is a front view, (B) is a top view, (C) is a side view. It is a cross-sectional side view which shows the filter of the fine powder removal apparatus of Example 1. It is a figure which shows the shape of the filter hole of the fine powder removal apparatus of Example 1. FIG. It is a figure which shows the usage example of the fine powder removal apparatus of Example 1. FIG. It is a side view which shows the flow of the air in the fine powder removal apparatus of Example 1. FIG. It is a top view which shows the flow of the air in the fine powder removal apparatus of Example 1, (A) is a top view which shows the flow of the air in an inflow port part, (B) shows the flow of the air in a isolation | separation part. A top view and (C) are top views which show the flow of the air in an outflow part. It is a figure which shows each effect | action of the filter hole (guide) of the fine powder removal apparatus of Example 1. FIG. It is a figure which shows the effect | action of the filter hole (guide) of the fine powder removal apparatus of Example 1. FIG. It is a figure which shows the modification of the guide of the fine powder removal apparatus of Example 1, (A) is a top view of a filter, (B) is a cross-sectional side view of a filter. It is a cross-sectional side view of the filter which shows the other modification of the guide of the fine powder removal apparatus of Example 1. It is a figure which shows the whole structure of the fine powder removal apparatus of the reference example compared with the fine powder removal apparatus of Example 1. FIG. It is a cross-sectional side view which shows the filter of the fine powder removal apparatus of a reference example. It is a figure which shows the whole structure of the fine powder removal apparatus of Example 2 of this invention. It is a figure which shows the external appearance of the fine powder removal apparatus of Example 2, (A) is a front view, (B) is a top view, (C) is a side view. It is a figure which shows the air supply means to the 2nd inflow port of the fine powder removal apparatus of Example 2. FIG. It is a side view which shows the flow of the air in the fine powder removal apparatus of Example 2. It is a top view which shows the flow of the air in the fine powder removal apparatus of Example 2, (A) is a top view which shows the flow of the air in an inflow port part, (B) shows the flow of the air in a isolation | separation part. A top view and (C) are top views which show the flow of the air in an outflow part. It is a figure which shows the whole structure of the fine powder removal apparatus of Example 3 of this invention. It is a figure which shows the external appearance of the fine powder removal apparatus of Example 3, (A) is a front view, (B) is a top view, (C) is a side view. It is a cross-sectional side view which shows the filter of the fine powder removal apparatus of Example 3. It is a side view which shows the flow of the air in the fine powder removal apparatus of Example 3. It is a top view which shows the flow of the air in the fine powder removal apparatus of Example 3, (A) is a top view which shows the flow of the air in a separation part, (B) shows the flow of the air in an outflow part. A top view and (C) are top views which show the flow of the air in an inflow port part. It is a figure which shows the whole structure of the fine powder removal apparatus of the reference example compared with the fine powder removal apparatus of Example 3. FIG.

  EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention (1st thru | or 4th invention) is demonstrated based on the Example shown on drawing.

  The fine powder removing apparatus according to the first embodiment will be described with reference to FIGS. FIG. 1 is a diagram showing the overall configuration of the fine powder removing apparatus of Example 1, FIG. 2 is a diagram showing the appearance of the fine powder removing apparatus of Example 1, (A) is a front view, (B) is a plan view, C) is a side view, FIG. 3 is a cross-sectional side view showing the filter of the fine powder removing device of Example 1, FIG. 4 is a diagram showing the shape of the filter hole of the fine powder removing device of Example 1, and FIG. The figure which shows the usage example of a fine powder removal apparatus, FIG. 6 is a side view which shows the flow of the air in the fine powder removal apparatus of Example 1, FIG. 7 is the plane which shows the flow of the air in the fine powder removal apparatus of Example 1. (A) is a plan view showing the flow of air at the inlet portion, (B) is a plan view showing the flow of air at the separation portion, and (C) is a flow of air at the outlet portion. FIG. 8 is a diagram showing individual actions of filter holes (guides) of the fine powder removing apparatus of the first embodiment, and FIG. 9 is a filter of the fine powder removing apparatus of the first embodiment. FIG. 10 is a diagram showing a modification of the guide of the fine powder removing apparatus of Example 1, FIG. 10A is a plan view of the filter, and FIG. 10B is a sectional side view of the filter. 11 is a cross-sectional side view of a filter showing another modified example of the guide of the fine powder removing apparatus of Example 1, and FIG. 12 is a diagram showing the entire configuration of the fine powder removing apparatus of the reference example compared with the fine powder removing apparatus of Example 1. FIG. 13 is a cross-sectional side view showing a filter of a fine powder removing apparatus of a reference example.

  As shown in FIG. 1 and FIG. 2, the fine powder removing apparatus of the present embodiment includes an inner cylinder 10 including a filter 30, an outer cylinder 20 arranged coaxially on the outer side of the inner cylinder 10, and a stand for installing the fine powder removing apparatus. The plate 40 and the upper lid 50 are used.

  As shown in FIG. 3, the filter 30 constitutes at least a part of a portion of the side wall of the inner cylinder 10 that overlaps the side wall of the outer cylinder 20 in the axial direction of the central axis 11 of the inner cylinder 10. For separating the fine powder 4 from the plastic resin pellet 2 (an example of a granular material) in the air-fuel mixture 3 (see FIG. 5 to FIG. 7) flowing into the outside of the side wall of the inner cylinder 10. When the central axis 11 is a vertical line, it is formed into a truncated cone shape that is narrowed vertically downward, and only the air 1 and fine powder 4 in the air-fuel mixture 3 pass through substantially the entire side wall (side surface). A large number of filter holes 31 (not allowing the pellet 2 to pass through) are arranged in a staggered manner. The side walls of the filter 30 are made of punching metal.

  As shown in FIG. 4, each filter hole 31 causes the free flow 5 (see FIG. 12) of the air-fuel mixture 3 that flows spirally along the inner wall (filter surface) of the filter 30 to the central axis 11 of the inner cylinder 10. In order to guide in a right-angle direction (horizontal direction when the central axis 11 of the inner cylinder 10 is a vertical line), it is formed in a long hole whose length direction is a direction perpendicular to the central axis 11 of the inner cylinder 10.

Further, each filter hole 31 is a guide provided in the filter 30, and the free flow 5 of the air-fuel mixture 3 that flows spirally along the inner wall of the filter 30 causes the central axis 11 of the inner cylinder 10 to move more than the free flow direction. Free flow of the air-fuel mixture 3 flowing in a spiral manner along the inner wall of the filter 30 as a guide for guiding in one direction of an angle region θ from a direction close to a direction perpendicular to the center axis 11 to the direction perpendicular to the central axis 11 of the inner cylinder 10. 5 is formed in a long hole whose length direction is a direction perpendicular to the central axis 11 of the inner cylinder 10 so as to be guided in a direction perpendicular to the central axis 11 of the inner cylinder 10.
Each filter hole 31 may be linear or curved (may be curved).
Even if the filter 30 is composed of a plurality of plate materials, and the plate material B and the plate material A adjacent to a certain plate material A in the swirl direction of the air-fuel mixture 3 partially overlap the inner wall of the plate material B and the outer wall of the plate material A. Good.
The side wall of the filter 30 may be formed into a cylindrical shape by bending one plate material (punching metal) and joining ends thereof, or by connecting a plurality of plate materials (pantin metal). In this case, the end of the air-fuel mixture 3 in the swirl direction upstream is the inside and the downstream end is the outside. It is preferable to overlap the parts.

  Returning to FIGS. 1 and 2, the inner cylinder 10 includes a filter 30, an upper cylinder portion 12 formed in a cylindrical shape that is substantially the same diameter as the upper opening diameter of the filter 30, and a lower opening diameter that is substantially the same as the lower opening diameter of the filter 30. It has a three-piece structure with a lower cylindrical portion 13 formed in a cylindrical shape, and a filter 30 is disposed between them so as to connect the upper and lower cylindrical portions 12 and 13. The upper and lower cylindrical portions 12 and 13 may have a truncated cone shape whose side walls are arranged in a conical surface including the side wall of the filter 30. The outer cylinder 20 has a two-piece structure of a cylindrical upper cylinder part 21 and a lower cylinder part 22 having substantially the same diameter. The coaxially arranged inner cylinder 10 and outer cylinder 20 are raised at a right angle from the base plate 40, and the upper part of the inner cylinder 10 (upper cylinder part 12) is the upper opening of the outer cylinder 20 (upper opening of the upper cylinder part 21). The upper opening of the inner cylinder 10 (upper opening of the upper cylinder portion 12) is closed by the upper lid 50, and the upper opening of the outer cylinder 20 is the upper part of the inner cylinder 10 passing through the upper cylinder and the side wall thereof. Is closed by a flange 12a provided so as to protrude from the outer cylinder 20 to the upper side.

  On the side wall of the upper part of the inner cylinder 10 protruding upward from the upper opening of the outer cylinder 20, an inflow pipe 60 is provided as an inlet for allowing the air-fuel mixture 3 to flow into the inner cylinder 10 in the tangential direction therefrom. . The inflow pipe 60 is a straight pipe, the inlet 61 in the inflow pipe 60 is formed in a circular shape, the outlet 62 is formed in a rectangular shape, and the outlet 62 is opened along the upper side wall of the inner cylinder 10 ( (See FIG. 7A).

Of the side wall of the outer cylinder 20, the lower part (lower cylinder part 22) of the outer cylinder 20 that overlaps the side wall of the lower part (lower cylinder part 13) than the filter 30 of the inner cylinder 10 in the axial direction of the central axis 11 of the inner cylinder 10. ) From the inside of the inner cylinder 10 through the inner side of the inner cylinder 10 (the side walls of the filter 30 and the side of the lower cylinder part 13) and the outer cylinder 20 It is an outlet for causing the fine powder 4 mixed air 1 that has flowed into the annular space 20A between the side wall (the side wall of the upper cylinder part 21 and the side wall of the lower cylinder part 22) to flow out of the outer cylinder 20 in the tangential direction. An outflow pipe 70 is provided. The outflow pipe 70 is a straight pipe, and both the inlet 71 and the outlet 72 of the outflow pipe 70 are formed in a circular shape. Outflow pipe 70 is an annular space between the side wall of inner cylinder 10 (the side wall of filter 30 and the side wall of lower cylinder part 13) and the side wall of outer cylinder 20 (the side wall of upper cylinder part 21 and the side wall of lower cylinder part 22). 20A, so as to form an inlet 71 that enters the lower part of the annular space 20A between the side wall of the lower part of the inner cylinder 10 (lower cylinder part 13) and the side wall of the lower part of the outer cylinder 20 (lower cylinder part 22). A tube side wall 73 that enters the lower part of the annular space 20A between the side wall of the lower part (lower cylinder part 13) of the inner cylinder 10 and the side wall of the lower part (lower cylinder part 22) of the outer cylinder 20 (FIG. 7C). reference).
In this embodiment, between the outflow pipe 70 and the side wall of the outer cylinder 20 (outer wall of the annular space 20A), between the outflow pipe 70 and the base plate 40 (the bottom surface of the outer cylinder 20: the bottom surface of the annular space 20A), respectively. Although there are gaps, it is preferable that these are not present. Although the circular opening shape of the inlet 71 of the outflow pipe 70 is shown, it may be circular or rectangular. The inlet 71 of the outflow pipe 70 is rectangular and preferably has no gap between the side wall of the outer cylinder 20 and the base plate 40.

  A circular through hole 41 having substantially the same diameter as the lower opening of the inner cylinder 10 (lower opening of the lower cylinder part 13) is provided at the center of the base plate 40, and the inner cylinder 10 is the edge of the through hole 41 of the base plate 40. The lower opening of the inner cylinder 10 is opened to the lower surface side of the base plate 40 to form a discharge port 13a for the pellet 2 from which the fine powder 4 has been removed. The outer cylinder 20 is raised from the outer side of the upper surface of the base plate 40, and the lower opening of the outer cylinder 20 is closed by the base plate 40.

  The inner cylinder 10 has a discharge opening 13a at the lower end and forms a columnar space 10A in which the inflow pipe 60 is connected to the upper side wall, and the outer cylinder 20 has a lower side wall around the columnar space 20A below the inflow pipe 60. An annular space 20A in which the outflow pipe 70 is connected to is formed. Of the side walls of the filter 30 and the lower cylinder portion 13 which are the side walls of the inner cylinder 10 at the boundary between the columnar space 20A and the annular space 20A, the side wall of the filter 30 is columnar space by a number of filter holes 31 provided therein. 10A and the annular space 20A are connected in communication, and the side wall of the lower cylindrical portion 13 blocks ventilation between the columnar space 10A and the annular space 20A.

  Next, assembly of the fine powder removing device of the present embodiment will be described.

  As shown in FIGS. 1 and 2, the lower cylinder portion 13 of the inner cylinder 10 and the lower cylinder portion 22 of the outer cylinder 20 are integrally provided on the base plate 40. When assembling the fine powder removing device of the present embodiment, the flange 30a provided at the lower end of the side wall of the filter 30 is overlaid on the flange 13b provided at the upper end of the side wall of the lower cylinder portion 13 of the inner cylinder 10, and The filter 30 is placed on the lower cylinder portion 13.

  Further, the upper cylinder portion 21 of the outer cylinder 20 is placed on the flange 22a provided at the upper end of the side wall of the lower cylinder portion 22 of the outer cylinder 20 via the ring-shaped lower packing 80, and the upper cylinder of the outer cylinder 20 is placed. A ring-shaped flange 82 is superposed on the portion 21 via a ring-shaped upper packing 81, and the upper tube portion 21 of the outer cylinder 20 is sandwiched between the flanges 82, 22a via upper and lower packings 81, 80.

  The flange 12 a provided to project outward from the vicinity of the lower end of the side wall of the upper cylinder portion 12 of the inner cylinder 10 is overlaid on the flange 82, and the lower end of the side wall of the upper cylinder portion 12 of the inner cylinder 10 is placed inside the upper opening of the filter 30. Fit. At this time, the filter 30 is sandwiched between the flange 12 a of the upper cylinder portion 12 of the inner cylinder 10 and the lower cylinder portion 13 of the inner cylinder 10. Further, the upper cylinder portion 21 of the outer cylinder 20 is sandwiched between the flange 12a of the upper cylinder portion 12 of the inner cylinder 10 and the lower cylinder portion 22 of the outer cylinder 20, and the upper opening of the outer cylinder 20 (the upper cylinder portion 21). The upper opening) is closed by the flange 12a of the upper cylinder portion 12 of the inner cylinder 10.

  A plurality of bolts 83 having male threads at both ends are passed through the flange 82 and passed between the flanges 12a and 22a, and nuts 84 are screwed onto the upper ends of the bolts 83 protruding upward from the upper surface of the flange 12a. A nut 84 is screwed to the lower end of each bolt 83 projecting downward from the lower surface of 22a, and the upper tube portion 12 of the inner tube 10 is connected to the lower tube portion 13 of the inner tube 10 and the lower tube portion 22 of the outer tube 20. tighten. At this time, in order to prevent the upper cylinder portion 21 of the outer cylinder 20 and the filter 30 from being deformed or cracked due to excessive tightening, each bolt 83 is provided with a cylindrical spacer 85 sandwiched between the flanges 12a and 22a. It is fitted.

  An outer portion of the upper lid 50 is placed on the flange 12b provided at the upper end of the side wall of the upper cylinder portion 12 of the inner cylinder 10, and a ring-shaped presser plate 86 is overlaid on the outer portion of the upper lid 50, thereby clamping the clamp band. The upper lid 50 is fixed to the flange 12b by 87 or the like, and the upper opening of the inner cylinder 10 (the upper opening of the upper cylinder portion 12) is closed by the upper lid 50 to complete.

  Thereby, filter replacement | exchange can be performed by removing the upper cylinder part 12 of the inner cylinder 10. FIG. Moreover, when washing | cleaning a fine powder removal apparatus, the lower cylinder part 13 of the inner cylinder 10, the lower cylinder part 22 of the outer cylinder 20, the integral part of the baseplate 40, the filter 30, and the upper cylinder part 12 of the inner cylinder 10 And the upper cylinder portion 21 of the outer cylinder 20.

  Next, the material of the fine powder removing apparatus of this embodiment will be described.

  Materials such as the inner cylinder 10, the outer cylinder 20, the base plate 40, and the upper lid 50 including the filter 30 may be metals such as general structural steel plates and stainless steel plates. At this time, it is preferable to use a transparent material such as acrylic, polycarbonate, or glass for the upper cylinder portion 21 and the upper lid 50 of the outer cylinder 20.

  Thereby, the flow 8 of the air 1 mixed with the fine powder 4 flowing spirally in the annular space 20 </ b> A through the outer cylinder 20 from the outside of the fine powder removing device can be visually confirmed. Further, the flow 6 of the air-fuel mixture 3 flowing spirally in the columnar space 10 </ b> A through the upper lid 50 from above the fine powder removing device, particularly the flow 6 of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30. It can be confirmed visually. Thus, the entire inside of the fine powder removing device can be seen through the upper cylinder portion 21 and the upper lid 50 of the outer cylinder 20 from the outside of the fine powder removing device, and the processing status of the fine powder removing device can be confirmed.

  Next, the use of the fine powder removing apparatus of this embodiment will be described.

  As shown in FIG. 5, the fine powder removing apparatus of the present embodiment is included in the pellet 2 before supplying the plastic resin pellet (which may be a chip) 2 as a raw material for plastic resin molding to the molding machine 90. In order to remove the fine powder 4 of the plastic resin, it is used by being installed vertically (may be installed obliquely) on the upper part of the raw material supply hopper 91 of the molding machine 90 via the base plate 40. At this time, the inlet pipe 60 is connected to the storage tank 92 of the pellet 2 via a hose or a pipe, and the outlet pipe 70 is a suction port of a blower 93 which is a fluid device that gives kinetic energy to the air 1 or increases the pressure. Connect to the hose or pipe. A dust collector 94 is provided between the outflow pipe 70 and the blower 93.

  Next, the operation of the fine powder removing apparatus of this embodiment will be described.

  First, the fine powder removing apparatus of the reference example shown in FIGS. 12 and 13 has the same structure as the fine powder removing apparatus of the present embodiment except for the shape of the filter hole 310 provided on the side wall of the filter 300. 12 and 13, the same reference numerals are given to the same structures as those of the fine powder removing apparatus of the present embodiment. As shown in FIGS. 12 and 13, the filter hole 310 provided in the side wall of the filter 300 of the fine powder removing apparatus of the reference example is circular, and the guide function like the filter hole 31 of the fine powder removing apparatus of the present embodiment is I don't have it.

  Both the fine powder removing apparatus of the present embodiment shown in FIGS. 6 and 7 and the fine powder removing apparatus of the reference example shown in FIGS. 12 and 13 are driven by the suction type pipe transport when the blower 93 connected to the outflow pipe 70 is driven. Is started. By this suction-type piping transportation, the air-fuel mixture 3 (including fine powder 4) of air 1 and pellets 2 passes through the inflow pipe 60 and into the upper cylinder portion 12 of the inner cylinder 10 (upper part of the columnar space 10A). It flows in the tangential direction from the side wall there, descends while turning along the inner wall of the upper cylinder part 12 of the inner cylinder 10, and enters the filter 30 (the upper and lower middle part of the columnar space 10A) in this embodiment. It enters the filter 300 (upper and lower middle portions of the columnar space 10A) and descends while turning along the inner walls of the respective filters 30 and 300. At this time, the filter hole 310 provided in the side wall of the filter 300 of the reference example is circular and does not have a guide function like the filter hole 31 provided in the filter 30 of the present embodiment. The flow of the air-fuel mixture 3 flowing along the inner wall 10 becomes a free flow 5 that is not guided (controlled). That is, the free flow 5 of the air-fuel mixture 3 to be guided by the filter hole 31 in the present embodiment is obtained, and the flow of the air-fuel mixture 3 flowing along the inner wall of the inner cylinder 10 in the present embodiment is guided (controlled) by the filter hole 31. The control flow 6 is obtained. The guide action of the filter hole 31 (conversion from the free flow 5 of the air-fuel mixture 3 to the control flow 6) will be described later.

  While the air-fuel mixture 3 flows spirally along the inner walls of the filters 30 and 300, the pellet 2 and the fine powder 4 in the air-fuel mixture 10 are filtered by the action of centrifugal force generated in the spiral flows 6 and 5. It is separated into the inside and outside of the side wall. The pellet 2 larger than the filter holes 31 and 310 does not pass through the filter holes 31 and 310 but remains inside the side walls of the filters 30 and 300, and the fine powder 4 smaller than the filter holes 31 and 310 passes through the filter holes 31 and 310 and is filtered. Separated outside the 30 and 300 side walls. At this time, since there is a flow 7 of air 1 that passes from the inside to the outside of the side walls of the filters 30 and 300 through the filter holes 31 and 310, the pellet 2 and the fine powder 4 can be easily separated.

  The fine powder 4 separated to the outside of the side walls of the filters 30 and 300, that is, the annular space 20A, descends while swirling by the flow 8 of the air 1 flowing spirally there, and reaches the lower portion of the annular space 20A. As a result, it flows out in a tangential direction from the side wall of the lower cylinder portion 22 of the outer cylinder 20. That is, it flows out of the outer cylinder 20. The fine powder 4 contained in the air 1 flowing out of the outer cylinder 20 is collected by the dust collector 94, and clean air 1 is released from the discharge port of the blower 93 into the atmosphere.

  While descending while swirling along the inner walls of the filters 30 and 300, the pellet 2 from which the fine powder 4 has been removed enters the lower cylinder portion 13 (lower part of the columnar space 10A) of the inner cylinder 10 and below the inner cylinder 10 It descends while turning along the inner wall of the cylinder part 13, reaches a discharge port 13 a which is a lower opening of the lower cylinder part 13 of the inner cylinder 10, and is discharged from there to a raw material supply hopper 91 of the molding machine 90. Of course, dust and small pieces of plastic resin passing through the filter holes 31 and 310 are also removed as foreign matter together with the fine powder 4 while descending while turning along the inner walls of the filters 30 and 300.

  Thus, both the fine powder removing apparatus of the present embodiment and the fine powder removing apparatus of the reference example can continuously process the pellet 2 and remove foreign matters such as the fine powder 4 from the pellet 2.

  Next, the operation of the filter hole 31 in this embodiment will be described.

  As shown in FIGS. 8 and 9, the filter hole 31 provided in the side wall of the filter 30 is a long hole whose length direction is a direction perpendicular to the central axis 11 of the inner cylinder 10. On the other hand, centrifugal force is acting on the air-fuel mixture 3 that flows spirally along the inner wall of the filter 30. For this reason, the filter hole 31 moves the pellet 2 in the air-fuel mixture 3 along the upper and lower sides 31 a and 31 b in the length direction of the filter hole 31, and the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30. The free flow 5 is guided in a direction perpendicular to the central axis 11 of the inner cylinder 10 which is the length direction of the filter hole 31, and as is clear from FIGS. 6 and 12, the mixture 3 in the filter 30 is guided. The free flow 5 is converted into a spiral control flow 6 having a smaller lead angle. Thereby, the residence time of the air-fuel mixture 3 on the filter surface becomes longer than that of the free flow 6, and the removal efficiency of the fine powder 4 can be increased.

  Here, the filter hole 31 provided in the side wall of the filter 30 has a length direction slightly different from that of the central axis 11 of the inner cylinder 10 than the flow direction of the free flow 5 of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30. If the hole is in a direction close to a right angle direction, the free flow 5 of the air-fuel mixture 3 in the filter 30 is converted to a control flow 6 having a smaller lead angle, and the residence time of the air-fuel mixture 3 on the filter surface is changed. However, the filter hole 31 provided in the side wall of the filter 30 is a long hole whose length direction is a direction perpendicular to the central axis 11 of the inner cylinder 10. The free flow 5 of the air-fuel mixture 3 can be converted into a control flow 6 having a smaller lead angle, and the residence time of the air-fuel mixture 3 on the filter surface can be made longer than that of the free flow 6.

  As shown in FIG. 8, the side wall of the filter 30 is formed in a truncated cone shape that narrows downward vertically when the central axis 11 of the inner cylinder 10 is a vertical line. In the filter hole 31 provided in the side wall, the lower side 31b in the length direction is closer to the center axis 11 of the inner cylinder 10 than the upper side 31a by the dimension d, and the certainty that the pellet 2 hits the lower side 31b of the filter hole 31 is increased. The guide function by the filter hole 31 can be exhibited effectively.

A modification of the guide of the fine powder removing apparatus of the present embodiment will be described. As shown in FIG. 10, in place of the filter hole 31, a large number of protrusions 32 whose length direction is perpendicular to the central axis 11 of the inner cylinder 10 are arranged in a staggered manner on the inner wall of the filter. However, similar to the filter hole 31, the guide is provided in the filter 30, and the free flow 5 of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30 is more centered on the inner cylinder 10 than in the free flow direction. It can be used as a guide for guiding in one direction of an angle region θ from a direction close to a direction perpendicular to the axis 11 to a direction perpendicular to the central axis 11 of the inner cylinder 10. The protrusion 32 can be a rod made of a metal or plastic resin wire, a plate (blade) made of a plate, or the like. As the filter provided with the protrusions 32, a known filter such as a filter 300 provided with a circular filter hole 310 on the side wall as in the fine powder removing apparatus of the reference example, or a filter whose side wall is formed of a metal net can be used. At this time, the protrusions 32 are arranged on the inner wall of the filter at intervals sufficiently wider than the filter holes 31 so that the aperture ratio on the side surface of the filter is not significantly reduced.
Another modification of the guide of the fine powder removing apparatus of the present embodiment will be described. As shown in FIG. 11, the first long hole (first filter) whose length direction is a direction perpendicular to the central axis 11 of the inner cylinder 10 (horizontal direction when the central axis 11 of the inner cylinder 10 is a vertical line). Hole) 501 is formed in a region 500A, and in the axially lower portion of the central axis 11 of the inner cylinder 10 than the region 500A (the lower portion in the vertical direction when the central axis 11 of the inner cylinder 10 is a vertical line) A second long hole (second filter hole) that guides in one direction from a direction closer to a direction perpendicular to the central axis 11 of the inner cylinder 10 than the free flow 5 to less than a direction perpendicular to the central axis 11 of the inner cylinder 10. ) A region 500B where the region 502B is formed is provided on the side wall, and the filter 500 is provided with the first long hole 501 and the second long hole 502 as a guide. This filter 500 is used in place of the filter 30 provided with the filter hole (guide) 31 and the filter 300 provided with the protrusion (guide) 32.
Here, the second long hole 502 formed in the region 500 </ b> B of the filter 500 is an inner cylinder in the length direction of the second long hole 502 from the upper part to the lower part of the central axis 11 of the inner cylinder 10. It is preferable that the inclination angle from the direction perpendicular to the central axis 11 of the ten is gradually increased. In this case, even if the inclination angle of each second long hole 502 is continuously increased from the upper part to the lower part in the axial direction of the central axis 11 of the inner cylinder 10, it is in area units (from A to F in the figure). You may enlarge it. In the filter 500, the first long hole 501 may or may not be provided.
In addition, as a guide provided in the filter, filter holes 31, 501 and 502 that penetrate the side wall of the filter, and a protrusion 32 that protrudes from the inner wall of the filter are used, and the length direction of the inner cylinder 10 is the central axis of the inner cylinder 10. A groove that is in a direction perpendicular to 11 or a direction closer to a direction perpendicular to the central axis 11 of the inner cylinder 10 than the free flow 5 of the air-fuel mixture 3 to a direction less than a direction perpendicular to the central axis 11 of the inner cylinder 10. May be used.
Here, the free flow in the fine powder removing device provided with the guide means that when the guide is a hole penetrating the side wall of the filter, the filter hole is defined as a minimum diameter (a distance between the upper side 31 a and the lower side 31 b, 8) is a flow of the air-fuel mixture at the time of operation of the fine powder removing device having the same configuration and conditions including the opening ratio of the side wall of the filter except that the hole is a round hole having a diameter. In the case of a hole other than a through-hole, the flow of the air-fuel mixture during operation of the fine powder removing device having the same configuration and conditions except that no guide is provided.

  By the way, when the side wall of the filter 30 extends to a position overlapping the outflow pipe 70 in the axial direction of the central axis 11 of the inner cylinder 10, outflow in the axial direction of the central axis 11 of the inner cylinder 10 out of the side walls of the filter 30. The air 1 passing through the filter hole 31 in the portion overlapping with the pipe 70 weakens the flow 8 of the air 1 flowing spirally in the annular space 20 </ b> A, and the air-fuel mixture flowing spirally along the inner wall of the filter 30. 3 is also weakened, and the removal efficiency of the fine powder 4 is reduced. However, in the fine powder removal apparatus of the present embodiment, as shown in FIGS. In the axial direction of the central shaft 11, at least a portion that overlaps the outflow pipe 70 is provided with a non-porous ventilation stopper (side wall of the lower cylinder portion 13) for blocking ventilation, and therefore along the inner wall of the filter 30. Spiral flow Mixture becomes 3 things flow 6 is strong, it is possible to increase the removal efficiency of fine powder 4.

  Further, when the inlet 71 of the outflow pipe 70 is opened along the side wall of the inner cylinder 10 like the outlet 62 of the inflow pipe 60, the swirling direction of the flow 8 of the air 1 flowing spirally in the annular space 20A Therefore, the flow 8 of the air 1 flowing spirally in the annular space 20 </ b> A becomes weak, and consequently the flow of the mixture 3 flowing spirally along the inner wall of the filter 30. 6 becomes weaker and the removal efficiency of the fine powder 4 is lowered. However, in the fine powder removing apparatus of the present embodiment, as shown in FIGS. 1, 6, and 7C, the outflow pipe 70 is connected to the side wall of the inner cylinder 10 and the outer cylinder 20. Since the pipe side wall 73 that has entered the annular space 20A is formed between the side wall and the side wall of the annular space 20A, the flow 8 of the air 1 that flows spirally in the annular space 20A becomes strong, and thus along the inner wall of the filter 30. The flow 6 of the air-fuel mixture 3 that flows spirally is also strong. Become things, can raise the removal efficiency of fine powder 4.

  As mentioned above, according to the present Example, there exist the following effects.

  The guides 31 and 32 are provided in the filters 30 and 300, and the guides 31 and 32 allow the free flow 5 of the air-fuel mixture flowing spirally along the inner walls of the filters 30 and 300 to move the inner cylinder 10 more than the direction of the free flow 5. The free flow of the air-fuel mixture 3 in the filters 30 and 300 is guided to one direction from the direction perpendicular to the central axis 11 to the direction perpendicular to the central axis 11 of the inner cylinder 10. It can be a small spiral. Therefore, the shape of the apparatus can be designed freely, and the residence time of the air-fuel mixture 3 on the filter surface can be lengthened.

  The filters 30 and 300 are provided with guides 31 and 32, and the guides 31 and 32 allow the free flow 5 of the air-fuel mixture 3 flowing spirally along the inner walls of the filters 30 and 300 to be perpendicular to the central axis 11 of the inner cylinder 10. The free flow 5 of the air-fuel mixture 3 in the filters 30 and 300 can be formed in a spiral shape with a smaller lead angle. Therefore, the residence time of the air-fuel mixture 3 on the filter surface can be further increased.

  The filter hole 31 is formed in a long hole whose length direction is a direction perpendicular to the central axis 11 of the inner cylinder 10, so that the free flow 5 of the air-fuel mixture flowing spirally along the inner wall of the filter 30 is filtered. As a guide for guiding the free flow 5 of the air-fuel mixture 3 that is guided in the length direction of 30 and flows spirally along the inner wall of the filter 30 in a direction perpendicular to the central axis 11 of the inner cylinder 10. The free flow 5 of the air-fuel mixture 3 in the filter 30 can be formed into a spiral with a small lead angle, the residence time of the air-fuel mixture 3 on the filter surface can be increased, and the air-fuel mixture in the filter 30 can be increased. Since the free flow 5 of 3 can be made into a spiral with a smaller lead angle, the residence time of the air-fuel mixture 3 on the filter surface can be further increased. Therefore, the shape of the apparatus can be designed freely, and the residence time of the air-fuel mixture 3 on the filter surface can be lengthened.

  When the center axis 11 of the inner cylinder 10 is a vertical line, the filter 30 is formed in a shape that narrows vertically downward, so that the length direction is along the inner wall of the filter 30 as a guide provided in the filter 30. It is formed in a long hole that is one direction from a direction closer to a direction perpendicular to the central axis 11 of the inner cylinder 10 to a direction perpendicular to the central axis 11 of the inner cylinder 10 than the direction of the free flow 5 of the air-fuel mixture 3 flowing in a spiral shape. When the filter hole 31 formed in the filter hole 31 or the long hole formed in the direction perpendicular to the central axis 11 of the inner cylinder 10 is employed, the lower side 31b in the length direction of the filter hole 31 is more than the upper side 31a. Thus, the certainty that the pellet 2 hits the lower side 31b of the filter hole 31 is increased, and the guide function by the filter hole 31 can be effectively exhibited.

  Of the side wall of the inner cylinder 10, at least a portion overlapping the outflow pipe 70 in the axial direction of the central axis 11 of the inner cylinder 10 is a non-perforated ventilation stopper (side wall of the lower cylinder part 13 of the inner cylinder 10). By providing this, the flow of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30 becomes strong, and the removal efficiency of the fine powder 4 can be increased.

  The outflow pipe 70 has a pipe side wall 73 that enters the annular space 20A so as to form an inlet 71 that enters the annular space 20A between the side wall of the inner cylinder 10 and the side wall of the outer cylinder 20. The flow of the air-fuel mixture 3 flowing spirally along the inner wall becomes strong, and the removal efficiency of the fine powder 4 can be increased.

  The fine powder removing apparatus according to the second embodiment will be described with reference to FIGS. FIG. 14 is a diagram showing the overall configuration of the fine powder removing apparatus of Example 2, FIG. 15 is a diagram showing the appearance of the fine powder removing apparatus of Example 2, (A) is a front view, (B) is a plan view, C) is a side view, FIG. 16 is a view showing air supply means to the second inlet of the fine powder removing apparatus of the second embodiment, and FIG. 17 is a side view showing the air flow in the fine powder removing apparatus of the second embodiment. FIG. 18 and FIG. 18 are plan views showing the air flow in the fine powder removing apparatus of Example 2, (A) is a plan view showing the air flow at the inlet, and (B) is the separation part. The top view which shows the flow of air, (C) is a top view which shows the flow of the air in an outflow port part.

  The fine powder removing apparatus of the present embodiment is obtained by adding a center tube 100, a filter cover 110, and a second inflow pipe (second inlet) 120 to the fine powder removing apparatus of the first embodiment. It has all the configuration of the removal device.

  As shown in FIGS. 14, 17, 18 </ b> A, and 18 </ b> B, the center cylinder 100 is detachably fixed at the upper end to the inner surface of the upper lid 50, and is coaxially inserted from the inner surface of the upper lid 50 into the inner cylinder 10. A cylindrical portion 101 parallel to the upper cylindrical portion 12 of the inner cylinder 10, a truncated cone portion 102 parallel to the side wall of the filter 30, and a closed end portion 103 on the truncated cone portion 102 side. The portion 103 is disposed between the upper opening and the lower opening of the filter 30, and forms a columnar space 10 </ b> A above the closed end 103 in the annular space 10 </ b> B. The air-fuel mixture 3 flowing in the tangential direction from the side wall of the upper cylinder part 12 of the inner cylinder 10 through the inflow pipe 60 descends while turning along the inner wall of the upper cylinder part 12 of the inner cylinder 10 and enters the filter 30. , While descending while swirling along the inner wall of the filter 30, the swirling inner diameter at that time is regulated by the side wall of the central cylinder 100, so that the air-fuel mixture 3 easily flows spirally along the inner wall of the filter 30.

  As shown in FIGS. 14, 17, and 18 </ b> B, the filter cover 110 is a side wall of the outer cylinder 20 that serves as an air flow suppressing unit that suppresses the amount of air 1 that passes through the filter hole 31 from the inner side to the outer side of the filter 30. And between the side walls of the filter 30. The filter cover 110 has a cylindrical shape, and a flange 111 provided in the upper opening is sandwiched between the flange 12 a and the flange 82, so that it is coaxial with the inner cylinder 10 and between the side wall of the outer cylinder 20 and the side wall of the filter 30. And covers at least the upper part of the side wall of the filter 30. The length of the side wall of the filter cover 110 (the area covering the side wall of the filter 30), the diameter (the distance between the side wall of the filter cover 110 and the side wall of the filter 30), and the shape (the presence or absence of holes, the degree of opening ratio) The amount of air 1 passing through the filter hole 31 from the inside to the outside of the filter 30 is optimized, the necessary amount of air 1 is secured in the filter 30, and the air-fuel mixture 3 spirals along the inner wall of the filter 30. The velocity of the flow 6 is not reduced during the flow. That is, the centrifugal force generated in the flow 6 of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30 is not reduced, and the reduction in the removal efficiency of the fine powder 4 is prevented.

  By the way, in this embodiment, when the outflow pipe 70 is rotated around the central axis 11 of the inner cylinder 10 with a radius from the central axis 11 of the inner cylinder 10 to the center of the inflow pipe 60, the central axis of the inner cylinder 10 is obtained. 11 flows in a spiral manner along the inner wall of the filter 30 and does not overlap the inflow pipe 60 as viewed in the axial direction, and the side wall of the inner cylinder 10 (the side wall of the filter 30 and the lower cylinder part 13). ) And the flow 8 of air 1 mixed with fine powder 4 spirally flowing between the side wall of the outer cylinder 20 and the side wall of the outer cylinder 20 (the side wall of the upper cylinder part 21 and the side wall of the lower cylinder part 22). By providing the outflow pipes 70 so as to overlap, the swirling directions of both flows 6 and 8 can be reversed. Here, the swirl direction is opposite to the flow 6 of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30, and the side wall of the inner cylinder 10 (the side wall of the filter 30 and the side wall of the lower cylinder portion 13) and the outer The flow 8 of air 1 mixed with fine powder 4 spirally flowing between the side wall of the cylinder 20 (the side wall of the upper cylinder part 21 and the side wall of the lower cylinder part 22) is outside from the inside of the side wall of the filter 30 through the filter hole 31. Since the air curtain suppresses the amount of air 1 passing through the filter cover 110, the air curtain can be used as an air flow suppressing means instead of the filter cover 110.

  As shown in FIGS. 14 and 15, the second inflow pipe 120 allows the gas for generating the swirl airflow to flow from the side wall of the inner cylinder 10, and the gas flows spirally along the inner wall of the filter 30 by the gas. Forms a swirling airflow 9 (see FIGS. 17 and 18C) having the same swirling direction as the flow 6 of the air 3, and a part 1a of air 1 (powder transport gas) flowing in from the inflow pipe 60 10 from the side wall of the lower cylinder portion 13 in a tangential direction. The second inflow pipe 120 is a straight pipe and penetrates the side wall of the lower cylinder portion 22 of the outer cylinder 20, and the inlet 121 in the second inflow pipe 120 is formed in a circular shape, It is open. The outlet 122 in the second inflow pipe 120 is formed in a rectangular shape, and the outlet 122 is opened along the side wall of the lower cylinder portion 13 of the inner cylinder 10. The position of the second inflow pipe 120 in the axial direction of the central axis 11 of the inner cylinder 10 only needs to be lower than the inflow pipe 60.

  As shown in FIG. 16, a Y-shaped pipe 124 is provided in the middle of the transport pipe 123 connecting the storage tank 92 and the inflow pipe 60, and the branch pipe 126 branched from the transport pipe 123 by the Y-shaped pipe 124 is connected to the second pipe 126. By connecting to the inflow pipe 120, a part 1 a of the air 1 for transporting the pipes of the pellet 2 is configured to flow from the second inflow pipe 120. The branch pipe 126 is provided with an air filter (passing only air 1a) 127 and a flow rate adjusting valve 128.

  The flow rate adjusting valve 128 reduces the flow rate of the air 1 a flowing in from the second inflow tube 120 than the flow rate of the air 1 flowing in from the inflow tube 60, but depends on the Y-shaped angle 125 of the Y-shaped tube 124. Since the flow rate from the connection port of the storage tank 92 to the connection port of the inflow pipe 60 and the connection port of the second inflow pipe 120 can be changed, the Y-shaped pipe 124 also has a first flow rate higher than the flow rate of the air 1 flowing from the inflow pipe 60. It can be used as a flow rate adjusting means for reducing the flow rate of the air 1a flowing in from the two inflow pipes 120.

  As shown in FIGS. 17 and 18C, the air 1a flows through the second inflow pipe 120 into the lower cylinder portion 13 of the inner cylinder 10 in the tangential direction from the side wall thereof, and the lower cylinder portion 13 of the inner cylinder 10 is obtained. A swirl airflow 9 having the same swirl direction as the flow 6 of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30 while swirling along the inner wall of the filter 30 is formed. The swirling airflow 9 entrains the flow 6 of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30 and brings the airflow 6 of the air-fuel mixture 3 close to the swirling flow into a spiral with a small lead angle. The residence time on the filter surface 3 becomes longer, and the removal efficiency of the fine powder 4 can be increased. Further, a portion of the side wall of the inner cylinder 10 that overlaps the second inflow pipe 120 in the axial direction of the central axis 11 of the inner cylinder 10 is not blocked by the side wall of the lower cylinder portion 13 of the inner cylinder 10 to block ventilation. The lower portion of the annular space 20A, which is a ventilation stopper for the hole, is located around the outer wall of the columnar space 10A (the side wall of the lower tube portion 13 of the inner cylinder 10). The strong swirling airflow 9 can be formed in the lower part of the columnar space 10A (inside the lower cylinder portion 13) of the columnar space 10A, so that the flow 6 of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30 is more A spiral with a small lead angle.

  In this embodiment, a part 1a of air 1 (powder particle transport gas) is supplied to the second inflow pipe 120. However, by a pipe system different from the pipe transport of the pellet 2 from the blower for generating the swirling airflow. Air for generating a swirling airflow may be supplied by pressure. A gas other than air, such as nitrogen gas or carbon dioxide gas, may be supplied as the gas for generating the swirling airflow. The second inflow pipe 120 may be configured to allow a gas for generating a swirling airflow to flow in a tangential direction from the side wall of the filter 30.

  With reference to FIG. 19 thru | or 24, the fine powder removal apparatus of Example 3 is demonstrated. FIG. 19 is a diagram showing the overall configuration of the fine powder removing device of Example 3, FIG. 20 is a diagram showing the appearance of the fine powder removing device of Example 3, (A) is a front view, (B) is a plan view, C) is a side view, FIG. 21 is a cross-sectional side view showing the filter of the fine powder removing apparatus of Example 3, FIG. 22 is a side view showing the flow of air in the fine powder removing apparatus of Example 3, and FIG. It is a top view which shows the flow of the air in 3 fine powder removal apparatuses, (A) is a top view which shows the flow of the air in a isolation | separation part, (B) is a top view which shows the flow of the air in an outflow part (C) is a top view which shows the flow of the air in an inflow port part, FIG. 24: is a figure which shows the whole structure of the fine powder removal apparatus of the reference example compared with the fine powder removal apparatus of Example 3. FIG.

  As shown in FIG. 19 and FIG. 20, the fine powder removing apparatus of the present embodiment includes an inner cylinder 140 including a filter 130, an outer cylinder 150 arranged coaxially on the outer side of the inner cylinder 140, and a base for installing the fine powder removing apparatus. A plate 160, an upper lid 170, and the like are included.

  As shown in FIG. 21, the filter 130 has the same structure and function as the filter 30 of the first and second embodiments. Of the side wall of the inner cylinder 140, at least a part of a portion overlapping with the side wall of the outer cylinder 150 in the axial direction of the central axis 141 of the inner cylinder 140 is configured, and the air-fuel mixture 3 that flows into the inner cylinder 140 (FIG. 22, FIG. 23) to separate the fine powder 4 from the plastic resin pellet 2 (an example of a granular material) in the outside of the side wall of the inner cylinder 140, and when the central axis 141 of the inner cylinder 140 is a vertical line, A large number of filters that are formed in a truncated cone shape that narrows downward in the vertical direction and allow only the air 1 and fine powder 4 in the air-fuel mixture 3 to pass through substantially the entire side wall (side surfaces) (the pellet 2 does not pass). The holes 131 are arranged in a staggered pattern. The side wall of the filter 130 is made of punching metal.

  Each filter hole 131 has the same structure and function as the filter hole 31 of the first and second embodiments. A free flow 5A of the air-fuel mixture 3 flowing spirally along the inner wall (filter surface) of the filter 130 (see FIG. 24) is perpendicular to the central axis 141 of the inner cylinder 140 (the central axis 141 of the inner cylinder 140 is vertical). In the case of a line, it is formed in a long hole whose length direction is a direction perpendicular to the central axis 141 of the inner cylinder 140. Each filter hole 131 is a guide provided in the filter 130, and the free flow 5A of the air-fuel mixture 3 that flows spirally along the inner wall of the filter 130 causes the central axis 141 of the inner cylinder 140 to flow more than the free flow direction. Free flow of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 130 as a guide for guiding in one direction of the angle region θ from the direction near the direction perpendicular to the center axis 11 to the direction perpendicular to the central axis 11 of the inner cylinder 10. 5A is formed in a long hole whose length direction is a direction perpendicular to the central axis 11 of the inner cylinder 10 so as to be guided in a direction perpendicular to the central axis 11 of the inner cylinder 10.

  Referring back to FIGS. 19 and 20, the inner cylinder 140 has a large truncated cone shape that is narrowed downward in the vertical direction when the central axis 141 is a vertical line, and is composed of three parts: an upper part, a middle part, and a lower part. Thus, the upper part is constituted by the filter 130, and the middle part and the lower part are constituted by the frustoconical middle cylinder part 142 and the lower cylinder part 143, respectively. The outer cylinder 150 has a two-piece structure of a cylindrical upper cylinder part 151 and a lower cylinder part 152 having substantially the same diameter, and the lower cylinder part 152 has a bottom plate 152a. Among the coaxially arranged inner cylinder 140 and outer cylinder 150, the inner cylinder 140 is raised from the base plate 160 at a right angle, and the outer cylinder 150 is arranged around the filter 130 and the middle cylinder portion 142 of the inner cylinder 140. The lower cylinder part 152 of the inner cylinder 140 protrudes downward from the center part of the bottom plate 152a, and the upper opening of the inner cylinder 140 (upper opening of the filter 130) and the upper opening of the outer cylinder 150 are aligned at substantially the same height position. (Upper opening of the upper cylinder portion 151) is closed by the upper lid 170.

  An inflow that is an inlet for allowing the air-fuel mixture 3 to flow into the inner cylinder 140 in a tangential direction from the side wall of the lower part (lower cylinder part 143) of the inner cylinder 140 protruding downward from the bottom plate 152a of the outer cylinder 150. A tube 180 is provided. The inflow pipe 180 is a straight pipe, and the inlet 181 in the inflow pipe 180 is formed in a circular shape, the outlet 182 is formed in a circular shape (which may be rectangular), and the outlet 182 is formed on the lower side wall of the inner cylinder 140. It is opened along (see FIG. 23C).

Further, of the side walls of the outer cylinder 150, the outer cylinder that overlaps the side wall of the middle part (middle cylinder part 142) of the inner cylinder 140 below the filter 130 of the inner cylinder 140 in the axial direction of the central axis 141 of the inner cylinder 140. On the side wall of the lower part (lower cylinder part 152) of 150, air 1 mixed with fine powder 4 (from each inner hole 140 through the filter holes 131 and from the inside of the inner cylinder 140 (the side wall of the filter 130 and the middle cylinder part 142). Of the fine powder 4 flowing into the annular space 150A between the side wall of the outer cylinder 20 and the side wall of the outer cylinder 20 (the side wall of the upper cylinder part 151 and the side wall of the lower cylinder part 152). An outflow pipe 190 is provided as an outflow outlet for the outflow. The outflow pipe 190 is a straight pipe, and both the inlet 191 and the outlet 192 in the outflow pipe 190 are formed in a circular shape. Outflow pipe 190 is an annular space between the side wall of inner cylinder 140 (the side wall of filter 30 and the side wall of middle cylinder part 142) and the side wall of outer cylinder 150 (the side wall of upper cylinder part 151 and the side wall of lower cylinder part 152). 150A, an inlet 191 is formed that enters the lower portion of the annular space 150A between the side wall of the middle part (middle cylinder part 142) of the inner cylinder 140 and the side wall of the lower part (lower cylinder part 152) of the outer cylinder 150. In addition, it has a tube side wall 193 that enters the lower portion of the annular space 150A between the middle wall (the middle tube portion 142) of the inner tube 140 and the lower wall (the lower tube portion 152) of the outer tube 150 (FIG. 23B). reference).
In this embodiment, between the outflow pipe 190 and the side wall of the outer cylinder 150 (outer wall of the annular space 150A), between the outflow pipe 190 and the bottom plate 152a (the bottom surface of the outer cylinder 150: the bottom surface of the annular space 20A), respectively. Although there are gaps, it is preferable that these are not present. Although the circular opening shape of the inlet 191 of the outflow pipe 190 is shown, it may be circular or rectangular. The inlet 191 of the outflow pipe 190 is rectangular and preferably has no gap between the side wall of the outer cylinder 150 and the bottom plate 152a.

  A circular through hole 161 having substantially the same diameter as the lower opening of the inner cylinder 140 (lower opening of the lower cylinder part 143) is provided at the center of the base plate 160. The inner cylinder 140 is an edge of the through hole 161 of the base plate 160. The lower opening of the inner cylinder 140 is opened to the lower surface side of the base plate 160 to form a discharge port 143a for the pellet 2 from which the fine powder 4 has been removed.

  The inner cylinder 140 has a discharge port 143a at the lower end and a funnel-shaped space 140A connected to the inflow pipe 180 on the lower side wall, and the outer cylinder 150 is formed around the funnel-shaped space 140A above the inflow pipe 180. An annular space 150A in which the outflow pipe 190 is connected to the side wall is formed. Of the side wall of the filter 130 and the side wall of the middle cylinder portion 142 which are the side walls of the inner cylinder 140 at the boundary between the funnel-shaped space 140A and the annular space 150A, the side wall of the filter 130 is funneled by a number of filter holes 131 provided therein. 140A and the annular space 150A are connected in communication, and the side wall of the middle cylindrical portion 142 blocks ventilation between the funnel-shaped space 140A and the annular space 150A.

  Next, assembly of the fine powder removing device of the present embodiment will be described.

  As shown in FIGS. 19 and 20, the middle cylinder part 142, the lower cylinder part 143, and the lower cylinder part 152 of the outer cylinder 150 are integrally provided on the base plate 160. When assembling the fine powder removing device of the present embodiment, the flange 130a provided at the lower end of the side wall of the filter 130 is overlaid on the flange 142a provided at the upper end of the side wall of the middle cylindrical portion 142 of the inner cylinder 140. The filter 130 is placed on the middle tube portion 142.

  Further, the upper cylinder portion 151 of the outer cylinder 150 is placed on the flange 152b provided at the upper end of the side wall of the lower cylinder portion 152 of the outer cylinder 150 via the ring-shaped lower packing 200, and the upper cylinder of the outer cylinder 150 is placed. A ring-shaped upper packing 201 is placed on the portion 151, and the upper lid 170 is placed on the inner cylinder 140 and the outer cylinder 150. At this time, the filter 130 is sandwiched between the upper lid 170 and the middle cylinder portion 142 of the inner cylinder 140. Further, the upper cylinder portion 151 of the outer cylinder 150 is sandwiched between the upper lid 170 and the lower cylinder portion 152 of the outer cylinder 150 via the upper and lower packings 201 and 200. The upper opening of the inner cylinder 140 (upper opening of the filter 130) and the upper opening of the outer cylinder 150 (upper opening of the upper cylinder portion 151) are integrally closed by the upper lid 170.

  A plurality of bolts 202 having male screws at both ends are passed between the upper lid 170 and the flange 152b, and nuts 203 are screwed onto the upper ends of the bolts 202 protruding upward from the upper surface of the upper lid 170, and downward from the lower surface of the flange 152b. A nut 203 is screwed onto the lower end of each bolt 202 projecting to the top, and a filter 130 is attached to the middle cylinder part 13 of the inner cylinder 140 by an upper lid 170, and an upper cylinder part 130 is attached to the lower cylinder part 152 of the outer cylinder 150. Tighten to complete. At this time, in order to prevent the upper lid 170, the filter 130 of the inner cylinder 140, the upper cylinder portion 151 of the outer cylinder 150 from being deformed or cracked due to excessive tightening, each bolt 202 has a gap between the upper lid 170 and the flange 152b. A cylindrical spacer 204 to be sandwiched is externally fitted.

  Thereby, the filter can be replaced by removing the upper lid 170. Further, when cleaning the fine powder removing device, etc., an integral part of the inner tube portion 142, the lower tube portion 143, the outer tube 150, the lower tube portion 152 and the base plate 160 of the inner tube 140, the filter 130, and the outer tube 150 Can be disassembled into an upper cylinder portion 151 and an upper lid 170.

  Next, the material of the fine powder removing apparatus of this embodiment will be described.

  Materials such as the inner cylinder 140, the outer cylinder 150, the base plate 160, and the upper lid 170 including the filter 130 may be metals such as general structural steel plates and stainless steel plates. At this time, it is preferable to use a transparent material such as acrylic, polycarbonate, or glass for the upper tube portion 151 of the outer tube 150. It is more preferable to use a transparent material for the upper lid 170 as well.

  Thereby, the flow 8A of the air 1 mixed with the fine powder 4 flowing spirally in the annular space 150A through the outer cylinder 150 from the outside of the fine powder removing device can be visually confirmed. Further, the flow 6A of the air-fuel mixture 3 flowing spirally in the funnel-shaped space 140A through the upper lid 170 from above the fine powder removing device, in particular, the flow 6A of the air-fuel mixture 3 in the filter 130 can be visually confirmed. In this way, the entire inside of the fine powder removing device can be seen through the upper cylinder portion 151 and the upper lid 170 of the outer cylinder 150 from the outside of the fine powder removing device, and the processing status of the fine powder removing device can be confirmed.

  Next, the use of the fine powder removing apparatus of this embodiment will be described.

  The fine powder removing apparatus of the present embodiment is installed in the molding machine 90 instead of the fine powder removing apparatus of the first and second embodiments, and the inflow pipe 180 is connected to the storage tank 92 of the pellet 2 via a hose or a pipe. Is connected to the suction port of the blower 93, which is a fluid device that gives kinetic energy to the air 1 or increases the pressure, through a hose or pipe, and is processed for each pellet 2 in a unit by batch processing. Foreign matter such as fine powder 4 is removed from When the fine powder removing device of this embodiment is installed in the molding machine 90, the raw material supply hopper 91 is removed, and the connecting port is vertically installed through the base plate 160 (may be installed obliquely). A dust collector 94 is provided between the outflow pipe 190 and the blower 93.

  Next, the operation of the fine powder removing apparatus of this embodiment will be described.

  First, the fine powder removing apparatus of the reference example shown in FIG. 24 has the same structure as the fine powder removing apparatus of the present embodiment except for the shape of the filter hole 410 provided on the side wall of the filter 400. In FIG. 24, the same reference numerals are given to the same structures as those of the fine powder removing apparatus of the present embodiment. As shown in FIG. 24, the filter hole 410 provided in the side wall of the filter 400 of the fine powder removing apparatus of the reference example is circular and does not have a guide function like the filter hole 131 of the fine powder removing apparatus of the present embodiment. Is.

  Both the fine powder removing apparatus of the present embodiment shown in FIGS. 22 and 23 and the fine powder removing apparatus of the reference example shown in FIG. 24 start suction pipe transportation when the blower 93 connected to the outflow pipe 190 is driven. The By this suction-type piping transport, the air-fuel mixture 3 (including fine powder 4) of air 1 and pellets 2 passes through the inflow pipe 180 and in the lower cylinder portion 143 of the inner cylinder 140 (lower part of the funnel-shaped space 140A). Flows into the tangential direction from the side wall there, rises while turning along the inner wall of the lower cylinder part 143 of the inner cylinder 140, enters the middle cylinder part 142, and rises while turning along the inner wall of the middle cylinder part 142 In this embodiment, the filter 130 (upper part of the funnel-shaped space 140A) is entered. In the reference example, the filter 400 (upper part of the funnel-shaped space 140A) is entered, and the filter 130 and 400 are swung along the inner walls. And reaches the upper lid 170. At this time, the filter hole 410 provided in the side wall of the filter 400 of the reference example is circular and does not have a guide function like the filter hole 131 provided in the filter 130 of the present embodiment. The flow of the air-fuel mixture 3 flowing along the inner wall 140 becomes a free flow 5A that is not guided (controlled). That is, the free flow 5A of the air-fuel mixture 3 to be guided by the filter hole 131 in the present embodiment becomes a flow, and the flow of the air-fuel mixture 3 flowing along the inner wall of the inner cylinder 140 in the present embodiment is guided (controlled) by the filter hole 131. Control flow 6A. The guide action of the filter hole 131 (conversion from the free flow 5A of the air-fuel mixture 3 to the control flow 6A) will be described later.

  One unit of the air-fuel mixture 3 stays in the filters 130 and 400 while swirling along the inner walls of the filters 130 and 400 until the drive of the blower 93 is stopped. In the meantime, the pellet 2 and the fine powder 4 in the mixture 3 are separated from the side walls of the filters 130 and 400 by the action of the centrifugal force generated in the flows 6A and 5A of the mixture 3 flowing spirally along the inner walls of the filters 130 and 400. It is separated inside and outside. The pellet 2 larger than the filter holes 131 and 410 does not pass through the filter holes 131 and 410 but stops inside the side walls of the filters 130 and 400, and the fine powder 4 smaller than the filter holes 131 and 410 passes through the filter holes 131 and 410 and is filtered. 130, 400 are separated to the outside of the side walls. At this time, since there is a flow 7A of air 1 that passes from the inside to the outside of the side walls of the filters 130 and 400 through the filter holes 131 and 410, the pellet 2 and the fine powder 4 can be easily separated.

  The fine powder 4 separated on the outside of the side walls of the filters 130 and 400, that is, in the annular space 150A, descends while swirling by the flow 8A of the air 1 flowing spirally there, and reaches the lower part of the annular space 150A. As a result, the outer cylinder 150 flows out from the side wall of the lower cylinder portion 152 in the tangential direction. That is, it flows out of the outer cylinder 150. The fine powder 4 contained in the air 1 flowing out of the outer cylinder 150 is collected by the dust collector 94, and clean air 1 is discharged into the atmosphere from the discharge port of the blower 93.

  While staying in the filters 130 and 400 while turning along the inner walls of the filters 130 and 400, the pellet 2 from which the fine powder 4 has been removed falls by stopping the drive of the blower 93, and the lower cylinder of the inner cylinder 140 It is discharged to the molding machine 90 from a discharge port 143 a that is a lower opening of the portion 143. Of course, while staying while swirling along the inner walls of the filters 130 and 400, dust passing through the filter holes 131 and 410, small pieces of plastic resin, and the like are removed together with the fine powder 4 as foreign matter. When one unit of fine powder removal processing is completed, the blower 93 starts to be driven, and the next one unit of fine powder removal processing is performed.

  Thus, both the fine powder removing apparatus of the present embodiment and the fine powder removing apparatus of the reference example are processed for each pellet 2 in a unit by batch processing, and foreign matters such as the fine powder 4 are removed from the pellet 2.

  Next, the operation of the filter hole 131 in this embodiment will be described.

  As shown in FIG. 22, the filter hole 131 provided in the side wall of the filter 130 is a long hole whose length direction is a direction perpendicular to the central axis 141 of the inner cylinder 140. On the other hand, centrifugal force is acting on the air-fuel mixture 3 that flows spirally along the inner wall of the filter 130. For this reason, the filter hole 131 moves the pellet 2 in the air-fuel mixture 3 along the upper and lower sides in the length direction of the filter hole 131, and the free flow 5 </ b> A of the air-fuel mixture 3 that flows spirally along the inner wall of the filter 130. Is guided in a direction perpendicular to the central axis 141 of the inner cylinder 140, which is the length direction of the filter hole 131, and as is clear from FIGS. 22 and 24, the free flow 5A of the air-fuel mixture 3 in the filter 130 is obtained. Is converted to a control flow 6A having a smaller lead angle.

  In the batch processing, the residence time of the pellets 2 on the inner walls of the filters 130 and 400 is determined by the driving time (suction time) of the blower 93. Therefore, the filter holes 131 and 410 are used in the fine powder removing apparatus of this embodiment and the fine powder removing apparatus of the reference example. There is no difference in the residence time due to the difference. However, when the pellet 2 turns in the filters 130 and 400, the pellet 2 does not move in a certain orbit, but moves while moving up and down or changing the distance from the inner wall of the filters 130 and 400 (up and down). The pellets 2 collide with each other, and the distance from the inner walls of the filters 130 and 400 varies due to the reaction). At this time, the filter hole 131 in the present embodiment is a long hole, and the vertical fluctuation of the pellet 2 can be suppressed. The ability to suppress the vertical fluctuation is to suppress the collision between the pellets 2. By not colliding (or weakening the colliding force), the pellet 2 receiving the centrifugal force stably orbits on the inner wall of the filter 130. Thus, the filter hole 131 which is a long hole can lengthen the time which contacts the filter surface of the pellet 2. FIG. Therefore, the fine powder removal efficiency can be increased. In other words, the action of “increasing the residence time on the filter surface” is “increasing the time for contacting the filter surface”. By the way, the fine powder removing apparatus of the present embodiment is a type in which the pellets 2 to be processed are inserted from the lower part of the apparatus and the processed pellets 2 are extracted from the lower part of the apparatus, but the discharged pellets 2 are discharged to the upper part of the apparatus. By providing the outlet, it is possible to make a type (continuous processing type) in which the pellets 2 to be processed are inserted from the lower part of the apparatus and the processed pellets 2 are extracted from the upper part of the apparatus. In the case of this type, the removal time of the fine powder 4 can be increased by increasing the residence time of the air-fuel mixture 3 on the filter surface.

  Here, the filter hole 131 provided in the side wall of the filter 130 has a length direction slightly longer than the flow direction of the free flow 5 </ b> A of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 130. The free flow 5A of the air-fuel mixture 3 in the filter 130 is converted into a spiral control flow 6A having a smaller lead angle, and a filter surface of the air-fuel mixture 3 is obtained. However, the filter hole 131 provided in the side wall of the filter 30 is a long hole whose length direction is a direction perpendicular to the central axis 141 of the inner cylinder 140. The free flow 5A of the air-fuel mixture 3 in the filter 130 can be converted into a spiral control flow 6A having a smaller lead angle, and the residence time of the air-fuel mixture 3 on the filter surface can be made longer than that of the free flow 6A. The It can be extended to.

  Further, the side wall of the filter 130 is formed in a truncated cone shape that narrows downward in the vertical direction when the central axis 141 of the inner cylinder 140 is a vertical line, and a filter hole provided in the side wall of the filter 130. In 131, the lower side in the length direction is closer to the central axis 141 of the inner cylinder 140 than the upper side, and the certainty that the pellet 2 hits the lower side of the filter hole 131 is increased, and the guide function by the filter hole 131 can be effectively exhibited.

  In the fine powder removing apparatus of the present embodiment as well, it is a guide provided on the filter 130, and the free flow 5 </ b> A of the air-fuel mixture 3 that flows spirally along the inner wall of the filter 130 is more central than the free flow direction. As a guide for guiding in one direction of an angle region θ from a direction close to a direction perpendicular to 141 to a direction perpendicular to the central axis 141 of the inner cylinder 140, the first length shown in FIG. The hole 501 and the second long hole 502, the protrusion 32 shown in FIG. 10, and other grooves can also be used.

  By the way, when the side wall of the filter 130 extends to a position overlapping the outflow pipe 190 in the axial direction of the central axis 141 of the inner cylinder 140, outflow in the axial direction of the central axis 141 of the inner cylinder 140 out of the side walls of the filter 130. The air 1 passing through the filter hole 131 in the portion overlapping with the pipe 190 weakens the flow 8A of the air 1 flowing spirally in the annular space 150A, and the mixture 3 flowing spirally along the inner wall of the filter 130 Although the flow 6A also becomes weak and the removal efficiency of the fine powder 4 decreases, in the fine powder removing apparatus of the present embodiment, as shown in FIGS. 19, 22, and 23B, the inner cylinder 140 is out of the side walls of the inner cylinder 140. In the axial direction of the central shaft 141, at least a portion overlapping the outflow pipe 190 is provided with a non-porous ventilation stopper (side wall of the middle cylinder 142) for blocking ventilation. Flow 6A of the mixture 3 flowing helically along the inner wall of the filter 130 becomes stronger, it is possible to increase the removal efficiency of fine powder 4.

  When the inlet 191 of the outflow pipe 190 is opened along the side wall of the inner cylinder 140 in the same manner as the outlet 182 of the inflow pipe 180, the swirl direction of the flow 8A of the air 1 flowing spirally in the annular space 150A Therefore, the flow 8A of the air 1 flowing spirally in the annular space 150A becomes weak, and consequently the flow of the air-fuel mixture 3 flowing spirally along the inner wall of the filter 30 6 is also weakened, and the removal efficiency of the fine powder 4 is lowered. However, in the fine powder removing apparatus of the present embodiment, as shown in FIG. 23B, the outflow pipe 190 is located between the side wall of the inner cylinder 140 and the side wall of the outer cylinder 150. Since the pipe side wall 183 enters the annular space 150A, the flow 8A of the air 1 flowing spirally in the annular space 150A becomes strong, and consequently flows spirally along the inner wall of the filter 130. That flow 6A of the mixture 3 also becomes stronger, it is possible to increase the removal efficiency of fine powder 4.

  As described above, the present embodiment has the same effects as the first embodiment.

  Also in the fine powder removing apparatus of the present embodiment, the center tube 100, the filter cover 110, and the second inflow pipe (second inlet) 120 added by the fine powder removing apparatus of the second embodiment can be added.

  As mentioned above, although Example 1 thru | or 3 demonstrated this invention (1st thru | or 4th invention) by the fine powder removal apparatus applied to the well-known suction type pipe transportation of a granular material, this invention is limited to it. However, various modifications can be made without departing from the scope of the invention. For example, the present invention can be applied to the well-known pressure-feed type pipe transportation of granular materials, and can also be applied to pipe transportation using nitrogen gas or carbon dioxide gas as a transport gas. In addition, in Examples 1 to 3, the present invention has been described with an apparatus that transports one type of granular material and removes fine powder. However, a plurality of types of granular material are transported and mixed to form fine powder. It is applicable also to the apparatus which removes.

  Further, in order to form a spiral flow inside and outside the filter side wall, it is not necessary to provide both of them on the cylinder side wall in the tangential direction with respect to the connection direction of the air-flow tube of the air-fuel mixture and the air out-flow tube mixed with fine powder. It suffices if the inflow pipe of the air-fuel mixture and the outflow pipe of air mixed with fine powder are different in the axial position of the central axis of the inner cylinder. Even if they do not overlap at all in the direction, they may overlap. In the case of Example 3, the axial position of the central axis of the inner cylinder of the inflow pipe for the air-fuel mixture and the outflow pipe for the air mixed with fine powder may be the same.

1 Air (transport gas)
2 Pellet (powder)
3 Gas mixture 4 Fine powder 10,140 Inner cylinder 11, 141 Central axis 20 150 Outer cylinder 30, 130, 300, 500 Filter 31, 131, 501, 502 Filter hole (guide)
32 Projection (Guide)
60, 180 Inflow pipe (inlet)
70, 190 Outflow pipe (outlet)

Claims (4)

  An inner cylinder and an outer cylinder arranged outside the inner cylinder, and at least a portion of the side wall of the inner cylinder that overlaps the side wall of the outer cylinder in the axial direction of the central axis of the inner cylinder is a porous filter. In addition, an inlet is provided in the inner cylinder for allowing a mixture of the particulate transport gas and the particulate to flow in, and passes through the filter hole together with the fine powder contained in the mixture flowing into the inner cylinder. In the fine powder removing device provided with an outlet for allowing the transported gas to flow out of the outer cylinder, the free flow of the air-fuel mixture flowing spirally along the inner wall of the filter is made to flow in the filter from the direction of the free flow. A fine powder removing apparatus comprising a guide for guiding in one direction from a direction close to a direction perpendicular to the central axis of the inner cylinder to a direction perpendicular to the central axis of the inner cylinder.   The fine powder removing device according to claim 1, wherein the guide guides the free flow of the air-fuel mixture flowing spirally along the inner wall of the filter in a direction perpendicular to the central axis of the inner cylinder. .   An inner cylinder and an outer cylinder arranged outside the inner cylinder, and at least a portion of the side wall of the inner cylinder that overlaps the side wall of the outer cylinder in the axial direction of the central axis of the inner cylinder is a porous filter. In addition, an inlet is provided in the inner cylinder for allowing a mixture of the particulate transport gas and the particulate to flow in, and passes through the filter hole together with the fine powder contained in the mixture flowing into the inner cylinder. In the fine powder removing apparatus provided with an outlet for allowing the transport gas to flow out of the outer cylinder, the filter hole is formed in a long hole whose length direction is a direction perpendicular to the central axis of the inner cylinder. A fine powder removing device.   4. The fine powder removing apparatus according to claim 1, wherein the filter is formed in a shape narrowed vertically downward when a central axis of the inner cylinder is a vertical line. 5.

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