JP2008110316A - Solid/gas separation apparatus for granular powder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solid/gas separation apparatus for granular powder by which foreign substances produced due to the pneumatic transportation is suitably separated from the granular powder and discharged from a flow-out pipe together with air. <P>SOLUTION: The solid/gas separation apparatus is provided with a cylindrical body 20 having an axial center in the vertical direction. The cylindrical body 20 has a cylindrical part 23 having a cylindrical shape in the upper part and a cone part 24 having an inside diameter made smaller downward in the lower part. A flow-in pipe 27 for allowing the pneumatically transported granular powder to flow in the cylindrical body is connected to the peripheral wall of the cylindrical part 23 in the tangential direction, a discharge port 25 for discharging the granular powder from the cylindrical body 20 is formed in the lower end part of the cone part 24. The flow-out pipe 29 for discharging the transporting air from the cylindrical body 20 and having the axial center in the vertical direction is connected to the upper wall of the cylindrical part 23 and the lower end part of the flow-out pipe 29 is arranged in the cone part 24. An air supply means for supplying ascending air flow into the cone part 24 from the discharge port 25 is further provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a solid-gas separation device (cyclone) that separates air-transported powder particles from air.

  FIG. 5 is a front view showing a conventional solid-gas separation device. The solid-gas separation device 111 includes a cylindrical main body 120 having a vertical axis, and the cylindrical main body 120 has a cylindrical cylindrical portion 123 in an upper portion and an inner diameter facing downward in a lower portion. Has a cone portion 124 that becomes smaller. An inflow pipe 127 is connected to the peripheral wall of the cylindrical portion 123 in a tangential direction, a discharge port 25 is formed at the lower end portion of the cone portion 124, and an upper and lower axial center is provided on the upper wall of the cylindrical portion 123. An outflow pipe 129 is connected.

  The solid-gas separation device 111 causes the air-transported powder particles to flow into the cylindrical portion 123 from the inflow pipe 127, and lowers the powder particles while swirling along the inner peripheral surface of the cylindrical portion 123. While discharging from the discharge port 125, the transportation air is discharged upward from the outflow pipe 129. Therefore, the air-transported granular material can be suitably separated from the air and taken out.

A similar solid-gas separation device is also disclosed in Patent Document 1 below.
JP 2005-324077 A

  The higher the performance of the solid-gas separation device as described above, the more completely the granular material (solid) is separated from the transportation air. However, there are cases in which foreign matter such as powders and tape-like floss generated during pneumatic transportation are mixed in the granular material, and if a solid-gas separation device with high performance is used, There is a problem that foreign substances are separated together with the powder and the foreign substances are discharged together with the powder.

  In general, if the foreign matter is about 10 to 50 μm or less, it can be separated from the granular material and discharged from the outflow pipe together with the transportation air, but larger foreign matter is separated from the granular material. It is difficult.

  In particular, as shown in FIG. 5, when the transportation air that has flowed into the cylindrical portion 123 from the inflow pipe 127 flows downward from around the outflow pipe 129, the flow velocity decreases due to a rapid expansion of the circulation area. . Therefore, the air for transportation does not have a momentum enough to separate foreign substances from the powder and flow into the outflow pipe 129.

  It is an object of the present invention to provide a solid-gas separation device for a granular material that can suitably separate foreign matter generated during pneumatic transportation from the granular material and discharge it from the outflow pipe together with the transportation air. Objective.

  1st invention of this application is equipped with the cylindrical main body which has an axial center of an up-down direction, and this cylindrical main body has a cylindrical cylindrical part in the upper part, and a cone part from which an internal diameter becomes small toward the lower part at the lower part. An inflow pipe for allowing the air-transported granular material to flow into the cylindrical main body is connected to the peripheral wall of the cylindrical portion in a tangential direction, and the lower end portion of the cone portion is connected to the cylindrical main body from the cylindrical main body. Solid-gas separation of the granular material, in which a discharge port for discharging the granular material is formed, and an outflow pipe for discharging transport air from the cylindrical main body is connected to the upper wall of the cylindrical portion In the apparatus, a lower end portion of the outflow pipe is disposed in the cone portion, and air supply means for supplying an upward air flow from the discharge port into the cone portion is provided.

  According to a second invention of the present application, in addition to the first invention, a lower cylindrical portion is formed in a lower portion of the cone portion, a lower end portion of the outflow pipe is disposed in the lower cylindrical portion, and the air supply means Thus, an ascending air flow is supplied from the discharge port into the lower cylindrical portion.

  According to the first aspect of the invention, since the air supply means for supplying the rising air flow from the discharge port at the lower end of the cone portion to the inside of the cone portion is provided, the foreign material that is lighter than the granular material by the rising air flow. Can be levitated from the falling granular material and discharged from the outflow pipe together with the air for transportation.

  In addition, according to the first invention, since the lower end portion of the outflow pipe is disposed in the cone portion, the transportation air that has flowed into the cylindrical portion from the inflow pipe flows downward from the periphery of the outflow pipe into the cylinder. It will enter into the cone part where the distribution area is narrower than the part, and the flow velocity of the transport air will be higher than that in the prior art (FIG. 5). Accordingly, the flow velocity of the transport air passing downward through the gap is increased, and the transport air applies a large downward force to the granular material. Therefore, even if the flow rate of the ascending air flow supplied from the outlet of the cone portion is increased, the granular material hardly rises, and only the foreign matter can be reliably lifted and discharged from the outflow pipe.

  Further, according to the first invention, since the lower end portion of the outflow pipe is in the cone portion, the inner periphery of the cylindrical main body is larger than that of a normal solid-gas separation device having a large gap between the outflow pipe and the inner peripheral surface of the cylindrical portion. The distance between the granular material flowing down along the surface and the foreign matter and the outflow pipe is shortened. In addition, since foreign matter is likely to gather at the center of the main body as it flows down, by setting the lower end of the outflow pipe to the optimum position, only foreign matter can be selectively introduced into the outflow pipe and easily separated from the granular material. be able to.

  According to the second invention, a lower cylindrical portion is formed in the lower portion of the cone portion, the lower end portion of the outflow pipe is disposed in the lower cylindrical portion, and the rising air from the discharge port into the lower cylindrical portion Since the air supply means for supplying the flow is provided, in addition to the effects of the first invention, the flow area of the lower cylindrical portion is constant, so that the flow velocity of the rising air flow does not decrease, The foreign matter can be separated and floated more reliably from the powder and discharged from the outflow pipe.

  FIG. 1 is a schematic view of an air transportation system 12 using the solid-gas separation device 11 of the first invention of the present application. The pneumatic transport system 12 discharges the granular material stored in the hopper 13 through the rotary valve 14, and the discharged granular material is transported through the transport pipe 28 by compressed air (transporting air) generated by the blower 15. Air to the solid-gas separation device 11, and in the solid-gas separation device 11, the granular material and the air for transportation are separated, and the granular material passes through the rotary valve 16 from the lower end of the solid-gas separation device 11. The air for transportation is discharged from the upper end of the solid-gas separator 11 and flows into the bag filter 18 through the air pipe 17, and after being cleaned by the bag filter 18, is discharged to the outside air. The powder particles are powders, particles, pellets, and the like, which are raw materials for industrial products and pharmaceuticals, and can be, for example, PET chips of about 3 mm square.

  FIG. 2 is a schematic front view showing the solid-gas separation device 11 of the present invention. The solid-gas separation device 11 includes a cylindrical main body 20 having a vertical axis, an air chamber 21 provided at the lower end of the cylindrical main body 20, and an ascending air flow in the cylindrical main body via the air chamber 21. Air supply means 22 for supplying air and a rotary valve 16 provided at the lower end of the air chamber 21.

  The cylindrical main body 20 includes a cylindrical cylindrical portion 23 and a cone portion 24 connected to the lower end portion of the cylindrical portion 23. The cone portion 24 is formed in a downward tapered shape (conical shape) such that the inner diameter decreases downward. At the lower end of the cone portion 24, a discharge port 25 for discharging the powder and granular material is formed.

  An inflow pipe 27 protruding in the tangential direction is connected to the upper peripheral wall of the cylindrical portion 23. The inflow pipe 27 is connected to the transport pipe 28 shown in FIG. An outflow pipe 29 having a vertical axis is passed through the upper wall of the cylindrical portion 23. The upper part of the outflow pipe 29 protrudes upward from the cylindrical part 23 and is connected to the air pipe 17 shown in FIG. The lower part of the outflow pipe 29 is inserted into the cylindrical main body 20.

  The lower end portion 29 </ b> A of the outflow pipe 29 is disposed below the boundary X between the cylindrical portion 23 and the cone portion 24, that is, in the cone portion 24. More specifically, the lower end portion 29 </ b> A of the outflow pipe 29 is disposed at a substantially central portion in the vertical direction of the cone portion 24. A gap T between the lower end portion 29 </ b> A of the outflow pipe 29 and the inner surface of the cone portion 24 is set to about 1/10 of the diameter of the cylindrical portion 23.

  The air chamber 21 is opened up and down, the lower part of the cone part 24 is inserted into the upper opening, and the rotary valve 16 is attached to the lower opening.

  The air supply means 22 includes a blower 31 that is a compressed air source, a pipe 32 that connects the blower 31 to the air chamber 21, and a filter 33 and a metering valve 34 that are provided in the pipe 32. When the blower 31 is operated, the compressed air flows into the air chamber 21 through the filter 33 and the metering valve 34, and flows into the cone portion 24 from the air chamber 21 as an upward flow.

[Operation of this embodiment]
Next, the operation of the solid gas separation device 11 will be described.
In FIG. 1, the granular material pneumatically transported from the hopper 13 flows into the cylindrical main body 20 from the inflow pipe 27 of the solid-gas separation device 11. FIG. 3 is a vertical cross-sectional view of the lower portion of the cylindrical main body 20, and the granular material P has the inner periphery of the cylindrical portion 23 and the cone portion 24 around the outflow pipe 29 together with the transportation air, as indicated by an arrow a. It descends while turning along the surface, and is discharged from the discharge port 25 through the gap T between the lower end portion 29A of the outflow pipe 29 and the cone portion 24. The transportation air flows into the outflow pipe 29 as shown by the arrow b.

  Further, the rising air flow (arrow c) generated by the blower 31 (FIG. 2) of the air supply means 22 is supplied into the cone portion 24. Foreign matter F such as dust and tape-like floss mixed in the granular material P during pneumatic transportation is separated from the granular material P by this rising air flow and floats, and the outflow pipe 29 together with the air for transportation. Flows in.

  Therefore, the foreign material F hardly mixes in the granular material P, and the quality of the product manufactured by using the granular material P as a raw material can be improved.

  The transport air that has passed through the gap T between the cone part 24 and the outflow pipe 29 enters the cone part 24 having a smaller flow area (cross-sectional area) than the cylindrical part 23, and then flows into the outflow pipe 29. Since the transportation air immediately before flowing into the outflow pipe 29 passes through a small distribution area in the cone portion 24, compared with the conventional technique (FIG. 5) in which the lower end portion of the outflow pipe 29 is disposed in the cylindrical portion 23. , The flow rate increases. Therefore, the foreign matter F contained in the granular material P can be caused to flow into the outflow pipe 29 with a stronger flow, and the foreign matter F can be more reliably separated from the granular material P.

  Further, since the lower end portion 29A of the outflow pipe 29 is disposed in the cone portion 24, the gap T between the lower end of the outflow tube 29 and the inner peripheral surface of the cone portion 24 is reduced, as indicated by a dotted arrow b ′. In addition, the flow velocity of the transportation air passing through the gap T is increased, and a strong downward force is given to the granular material P. Therefore, even if the rising air flow (arrow c) by the air supply means 22 is increased, the granular material P is not discharged from the outflow pipe 29 on the rising air flow, and the foreign matter F is generated by the strong rising air flow. Can be discharged from the outflow pipe 29.

  However, the flow rate of the rising air flow is set to be smaller than the floating speed of the granular material P (the speed at which the granular material P floats) in order to reliably prevent the granular material P from flowing into the outflow pipe 29. Is preferred. As shown in FIG. 2, this flow rate can be adjusted by a metering valve 34 provided in the pipe 32 of the air supply means 22.

[Second Embodiment]
FIG. 4 is a vertical cross-sectional view of the lower part of the solid-gas separation device 11 according to the second embodiment of the present invention (second embodiment). In the present embodiment, a lower cylindrical portion 36 formed in a cylindrical shape is connected to the lower portion of the cone portion 24, and the lower end portion of the outflow pipe 29 is disposed in the lower cylindrical portion 36. In the case of the present embodiment, the ascending air flow by the air feeding means 22 (FIG. 2) flows into the outflow pipe 29 without the flow velocity being weakened in the lower cylindrical portion 36.

  That is, in the first embodiment, as shown in FIG. 3, the flow rate of the ascending air flow that has flowed from the discharge port 25 is slightly reduced due to the shape of the upper part of the cone portion 24, but in this embodiment, Since the flow area of the lower cylindrical portion 36 is constant, the flow rate of the ascending air flow does not decrease, and the foreign matter F can be separated and floated from the powder P more reliably and discharged from the outflow pipe 29. .

  The present invention (first and second inventions) is not limited to the above-described embodiment, and the design can be changed as appropriate.

  The present invention (first and second inventions) can be suitably employed in a system that pneumatically transports a granular material that is a raw material for industrial products and pharmaceuticals.

It is the schematic of the pneumatic transportation system using the solid-gas separation apparatus of 1st invention of this application. It is a schematic front view which shows the solid-gas separation apparatus of 1st invention of this application. It is a longitudinal cross-sectional view of the lower part of a cylindrical main body. It is a longitudinal cross-sectional view of the lower part of the solid-gas separation apparatus concerning Embodiment (2nd Embodiment) of 2nd invention of this application. It is a schematic front view which shows the conventional solid-gas separation apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Solid-gas separator 22 Air supply means 23 Cylindrical part 24 Cone part 25 Outlet 27 Inflow pipe 29 Outflow pipe

Claims (2)

A cylindrical main body having a vertical axis, the cylindrical main body having a cylindrical cylindrical portion at the upper portion and a cone portion having a lower inner diameter at the lower portion; An inflow pipe for allowing the air-transported granular material to flow into the cylindrical main body is connected to the peripheral wall in a tangential direction, and for discharging the granular material from the cylindrical main body to the lower end portion of the cone portion. In the solid-gas separation device for a granular material, in which a discharge port is formed and an outflow pipe for discharging transport air from the cylindrical main body is connected to the upper wall of the cylindrical portion,
The lower end of the outflow pipe is arranged in the cone part,
A solid-gas separation device for a granular material, comprising air supply means for supplying an ascending air flow from the discharge port into the cone portion. A cylindrical main body having a vertical axis, the cylindrical main body having a cylindrical cylindrical portion at the upper portion and a cone portion having a lower inner diameter at the lower portion; An inflow pipe for allowing the air-transported granular material to flow into the cylindrical main body is connected to the peripheral wall in a tangential direction, and for discharging the granular material from the cylindrical main body to the lower end portion of the cone portion. In the solid-gas separation device for a granular material, in which a discharge port is formed and an outflow pipe for discharging transport air from the cylindrical main body is connected to the upper wall of the cylindrical portion,
A lower cylindrical part is formed at the lower part of the cone part,
The lower end of the outflow pipe is disposed in the lower cylindrical portion,
A solid-gas separation apparatus for a granular material, comprising air supply means for supplying a rising air flow from the discharge port into the lower cylindrical portion.

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