JP2015074523A - Pneumatic transportation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel neumatic transportation device capable of reducing a load of a bag filter while performing pneumatic transportation.SOLUTION: A pneumatic transportation device 1 comprises a separation chamber S in which an annular peripheral circuit 80 with the top closed and with the bottom opening toward downward of the separation chamber S is formed. The pneumatic transportation device 1 directs an air flow introduced through an introduction pipe 4 toward downward of the separation chamber S revolving the air flow along the peripheral circuit 80, passes the air flow the bottom end of the separation chamber S, and then directs the air flow toward an outlet tube 5.

Description

  The present invention relates to a pneumatic transport device for pneumatically transporting a granular material.

  Pneumatic transportation that transports powder particles existing at the transportation source to the transportation destination by placing them on the air flow is a closed circuit transportation, so there is a risk of contamination by foreign substances, contamination with bacteria, etc. Since it is small and easy to automate and save labor, it is widely used in the fields of chemicals, foods, chemical products and the like.

  As the pneumatic transport device 100 used for this pneumatic transport, as shown in FIG. 6, a device main body 2 having a separation chamber S therein, an opening / closing mechanism 3 for opening and closing the bottom of the device main body 2, An introduction pipe 4 communicated with the separation chamber S through a side wall surface of the apparatus main body 2, a discharge pipe 5 communicated with the separation chamber S through a top plate of the apparatus main body 2, and an upper portion in the apparatus main body 2. In general, the bag filter 6 is configured to include the bug filter 6.

  In this pneumatic transport device 100, a suction device such as a vacuum pump or an ejector pump is used to form an air flow from the introduction pipe 4 through the separation chamber S toward the discharge pipe 5, and this air flow Then, the particles existing at the transportation source are introduced into the separation chamber S through the introduction pipe 4. Most of the granular material introduced into the separation chamber S is separated from the air flow toward the discharge pipe 5 and is deposited on the bottom of the apparatus main body 2. The granular material deposited on the bottom of the apparatus main body 2 is discharged from the bottom of the apparatus main body 2 by operating the opening / closing mechanism 3 at a predetermined timing.

  On the other hand, a part of the granular material is directed to the discharge pipe 5 while riding on the air flow. In this air transport device 100, on the upstream side before the air flow reaches the discharge pipe 5, The bag filter 6 is designed to pass through the filter cloth of the bag filter 6, and the particulates contained in the air flow toward the discharge pipe 5 are collected by the bag filter 6.

  The pneumatic transport device 100 further includes a backwash device 7 for backwashing the bag filter 6 by spraying compressed air into the bag filter 6, and the collected powder. Clogging of the bag filter 6 due to the granules is prevented.

  Recently, a double damper type continuous suction type pneumatic transport device has been developed which is capable of continuously pneumatically transporting powder particles without interruption by making the opening and closing mechanism a double damper type (for example, , See Patent Documents 1 and 2 below).

JP 2006-306627 A JP 2010-83673 A

  By the way, in this type of pneumatic transport device, the introduction pipe communicates with the inner peripheral surface of the separation chamber from the tangential direction, and the flow of air introduced from the introduction pipe is in the separation chamber. It is made to turn along a peripheral surface.

  This creates a cyclone effect by applying a centrifugal force to the particles contained in the air flow, lowering the concentration of the particles contained in the air flow toward the discharge pipe, and This is a measure to reduce the burden of the bug filter.

  However, in order to give sufficient centrifugal force to the granular material contained in the air due to the cyclone effect, first, a sufficient volume (particularly depth) is required for the separation chamber. Further, the introduction pipe needs to communicate with the separation chamber at a position considerably lower than the position where the bag filter exists. Furthermore, it is necessary to increase the suction force by the suction device, thereby giving a considerable speed to the air flow introduced into the separation chamber.

  Increasing the volume of the separation chamber or lowering the position where the introduction pipe communicates lowers the size of the apparatus and increases costs. Further, when the suction force of the suction device is increased, the running cost increases.

  The present invention has been developed in view of the above technical problem, and an object of the present invention is to provide a novel pneumatic transport device that can reduce the load on the bag filter during the pneumatic transport operation.

  In order to solve the technical problem, an air transport device according to the present invention includes an apparatus main body having a cylindrical separation chamber therein, an opening / closing mechanism for opening and closing the bottom of the apparatus main body, An introduction pipe communicated from the tangential direction to the inner peripheral surface of the separation chamber through the side wall surface, a discharge pipe communicated with the separation chamber through the top plate of the apparatus main body, and an upper portion in the apparatus main body A bag filter disposed on the air filter, the bag filter being placed on the flow of air from the introduction pipe to the discharge pipe through the separation chamber, and introducing a granular material into the separation chamber. While discharging the granular material deposited on the bottom by operating the opening and closing mechanism, the powder contained in the air by passing the air flow toward the discharge pipe through the filter cloth of the bag filter Filter and collect particles An air transportation device, wherein an upper portion of the separation chamber is located above the position where the introduction pipe communicates, and an annular eave portion disposed along an inner wall of the separation chamber, and extends downward from an inner peripheral edge of the eave portion. An annular shape in which the upper portion is closed between the inner peripheral surface of the separation chamber and the outer peripheral surface of the cylindrical wall portion, and the lower portion is opened toward the lower side of the separation chamber. The peripheral circuit is formed, and the air flow introduced from the introduction pipe turns downward along the peripheral circuit and goes below the separation chamber, passes through the lower end of the cylindrical wall portion, and then It is characterized by being directed to the discharge pipe (hereinafter referred to as “the device of the present invention”).

  In the device according to the present invention, a preferred embodiment is one in which the outer diameter of the cylindrical wall portion is in the range of 0.5 to 0.9 times the inner diameter of the separation chamber.

  In the device according to the present invention, the eaves portion is configured such that the air flow introduced from the introduction pipe swirls at least 1.5 times along the circumferential circuit until reaching the lower end of the cylindrical wall portion. It is preferable that the length from the inner peripheral edge to the lower end of the cylindrical wall is determined.

  In the device according to the present invention, it is preferable that the upper surface of the eave portion is an inclined surface that extends downward from the separation chamber.

  According to the present invention, it is possible to reduce the burden on the bag filter during pneumatic transportation work.

FIG. 1 is a cross-sectional view showing a device of the present invention according to an embodiment. FIG. 2 is a perspective view showing the turning guide. FIG. 3 is a side view showing a state in which the granular material is pneumatically transported using the apparatus of the present invention. FIG. 4 is a cross-sectional view illustrating the air flow during pneumatic transportation. FIG. 5 is a cross-sectional view showing a state in which the bag filter of the device of the present invention is backwashed. FIG. 6 is a cross-sectional view showing a conventional pneumatic transport device.

  Hereinafter, although the form (embodiment) for carrying out the present invention is explained based on a drawing, the present invention is not limited to this embodiment.

  FIG. 1 shows a device 1 of the present invention according to the first embodiment. The device 1 of the present invention includes a device body 2, an opening / closing mechanism 3, an introduction tube 4, a discharge tube 5, and a bag filter 6.

  The apparatus main body 2 includes a cylindrical portion 21 and a dome-shaped top plate portion 22. The cylindrical portion 21 is formed by connecting a first cylindrical portion 211 that constitutes the lower stage of the cylindrical portion 21 and a second cylindrical portion 212 that constitutes the upper stage, and the apparatus main body 2 includes the first cylinder. The upper opening of the second cylindrical portion 212 connected on the portion 211 has a structure closed by the top plate portion 22.

  The opening / closing mechanism 3 includes a flap valve 31 attached to close the lower end opening of the cylindrical portion 21 in the apparatus main body 2 and an actuator 32. More specifically, the actuator 32 is attached to a cylindrical discharge cylinder 34 attached to the lower end of the cylindrical portion 21 such that the rotation shaft 33 is directed in the horizontal direction, and the flap valve 31 is The actuator 32 is attached to the rotating shaft 33. Therefore, the opening / closing mechanism 3 is configured to open and close the flap valve 31 when the rotary shaft 31 is rotated by operating the actuator 32.

  In the present embodiment, the upper surface of the flap valve 31 corresponds to “the bottom of the apparatus main body” in the claims. The internal space of the apparatus main body 2 formed by the cylindrical portion 21, the top plate portion 22, and the flap valve 31 is a separation chamber S.

  The introduction pipe 4 is a cylindrical pipe and is tangential to the inner circumferential surface of the separation chamber S through the side wall surface of the apparatus main body 2 (the side wall surface of the first cylindrical portion 211 in the cylindrical portion 21). It is communicated.

  The discharge pipe 5 is a cylindrical pipe and communicates with the separation chamber S through the top plate portion 22 of the apparatus main body 2. In the present embodiment, the discharge pipe 5 communicates with the separation chamber S from the horizontal direction through the side wall of the top plate portion 22.

  The bag filter 6 has a bottomed cylindrical overall shape, and is arranged such that a filter cloth 61 processed into a pleat shape circulates around the outer peripheral surface. The bag filter 6 is reinforced by a metal bottom plate 62 and a punching sheet 63 arranged so as to go around the inner peripheral surface of the bag filter 6. Further, a flange portion 64 is provided at the upper end opening of the bag filter 6.

  The bag filter 6 is arranged at the upper part in the apparatus main body 2 such that the upper end opening faces the top plate portion 22 of the apparatus main body 2. More specifically, the bag filter 6 has the flange portion 64 on the inner peripheral edge of an annular mounting plate 23 interposed between the cylindrical portion 21 (second cylindrical portion 212) and the top plate portion 22 in the apparatus main body 2. Is mounted by being screwed to the mounting plate 23.

  The “top plate” in the claims is located above the upper end opening of the bag filter 6 mounted in the apparatus main body 2 among the partition walls forming the separation chamber S in the apparatus main body 2. It means a partition wall. Accordingly, in the present embodiment, the top plate portion 22 corresponds to a “top plate” in the claims.

  Moreover, in the said invention apparatus 1 which concerns on this embodiment, the backwash apparatus 7 for backwashing the said bag filter 6 is further comprised.

  In the present embodiment, the backwash device 7 includes a diaphragm valve unit 71, a flow tube 72, and a nozzle 10.

  The diaphragm valve unit 71 is positioned outside the apparatus main body 2 in a state where the diaphragm valve unit 71 is connected to a primary opening end of the flow tube 72 attached through the side wall of the top plate portion 22 of the apparatus main body 2. ing.

  The flow tube 72 is attached to the apparatus main body 2 such that the secondary opening end extends in the horizontal direction toward the axis of the bag filter 6 at the upper part of the bag filter.

  The flow tube 72 has a through-hole 73 that opens toward the upper end opening of the bag filter 6 at a position where the tube wall of the flow tube 72 overlaps the axial center of the bag filter 6. The secondary opening end of the flow tube 72 is closed by an end cap 74.

  The nozzle 10 has an annular shape and is fixed to the through hole 73 formed in the flow tube 72 by welding.

  And in the said invention apparatus 1, the funnel-shaped turning guide part 8 is provided in the upper part from the position which the said introduction pipe | tube 4 in the said separation chamber S communicates.

  As shown in FIG. 2, the turning guide portion 8 includes an annular eave portion 81 along the inner wall of the separation chamber S, and a cylindrical cylindrical wall portion 82 extending downward from the inner peripheral edge of the eave portion 81. It has. The turning guide portion 81 is attached to the cylindrical portion 21 with the outer edge 811 of the eave portion 81 sandwiched between the first cylindrical portion 211 and the second cylindrical portion 212 of the cylindrical portion 21. It has been.

  In the present embodiment, the outer diameter of the cylindrical wall portion 82 in the swivel guide portion 8 is 0.7 times the inner diameter of the separation chamber S. By the swivel guide portion 8, the separation chamber S is used. Between the inner peripheral surface of the cylindrical wall portion 82 and the outer peripheral surface of the cylindrical wall portion 82 is an annular peripheral circuit 80 whose upper portion is closed by the eave portion 81 and whose lower portion is opened downward of the separation chamber S. Is formed.

  The device 1 of the present invention having the above-described configuration is used for pneumatically transporting powder particles. FIG. 3 shows an example of a pneumatic transportation method using the device 1 of the present invention.

  In the pneumatic transportation method shown in FIG. 3, the granular material existing in the primary container V <b> 1 at the transportation source is pneumatically transported to the secondary container V <b> 2 placed at the lower part of the apparatus 1 of the present invention.

  In this pneumatic transportation method, one end of a transportation pipe P1 is connected to the introduction pipe 4 of the device 1 of the present invention, and a suction nozzle N is attached to the other end of the transportation pipe P1. One end of an air suction pipe P2 is connected to the discharge pipe 5 of the device 1 of the present invention, and a suction device 50 such as a vacuum pump or an ejector pump is attached to the other end of the air suction pipe P2. It is done. That is, in this pneumatic transport method, by operating the suction device 50, an air flow from the introduction pipe 4 through the separation chamber S to the discharge pipe 5 is generated.

  When the tip of the suction nozzle N is inserted into the granular material existing in the primary container V1 and the suction device 50 is operated, the granular material is sucked from the suction nozzle N, and the transport pipe P1 And is introduced into the separation chamber S.

  At this time, in the apparatus 1 of the present invention, the introduction pipe 4 communicates with the inner peripheral surface of the separation chamber S from the tangential direction, and the inner periphery of the separation chamber S is provided by the swivel guide portion 8. Since the peripheral circuit 80 is formed between the surface and the outer peripheral surface of the cylindrical wall portion 82, the air flow introduced from the introduction pipe 4 flows into the peripheral circuit 80 as shown in FIG. 4. It turns downward along the separation chamber S, passes through the lower end of the cylindrical wall portion 82, and then goes to the discharge pipe 5.

  The granular material introduced into the separation chamber S is swung along the peripheral circuit 80 and is directed to the lower side of the separation chamber S, most of which is separated from the air flow, Deposit at the bottom of the.

  After a certain amount of powder is deposited on the bottom of the separation chamber S, the air flow is stopped by stopping the suction device 50, and as shown in FIG. When the actuator 32 is operated, the flap valve 31 is opened, and the granular material falls toward the secondary container V2. By this operation, the granular material existing in the primary container V1 is pneumatically transported to the secondary container V2.

  On the other hand, a part of the granular material that has not been separated from the air flow in the separation chamber S travels toward the discharge pipe 5 while riding on the air flow. The granular material is collected by filtration when passing through the filter cloth 61 of the bag filter 6 disposed on the upstream side of the discharge pipe 5. Thereby, it is prevented that a granular material mixes in the air discharged | emitted from the said discharge pipe 5. FIG. In the device 1 of the present invention, the flow of air introduced from the introduction pipe 4 by the peripheral circuit 80 provided in the separation chamber S passes through the lower end of the cylindrical wall portion 82, and then Since it goes to the discharge pipe 5, the quantity of the granular material contained in the air flow which goes to the said discharge pipe 5 becomes comparatively small.

  And since the filter cloth 61 of the said bag filter 6 produces clogging gradually by the granular material filtered and collected by the said bug filter 6, in this invention apparatus 1 which concerns on this embodiment, it shows in FIG. As described above, the backwashing device 7 is operated at a predetermined timing, and the bag filter 6 is backwashed by injecting compressed air from the nozzle 10 directed into the bag filter 6.

  By the way, in this embodiment, the outer diameter of the cylindrical wall portion 82 in the turning guide portion 8 is 0.7 times the inner diameter of the separation chamber S. The outer diameter of the wall portion 82 is preferably in the range of 0.5 to 0.9 times (more preferably in the range of 0.6 to 0.8 times) the inner diameter of the separation chamber S. .

  In the present invention, the air flow swirling along the circumferential circuit 80 swirls at least 1.5 times (more preferably 2 times or more) before reaching the lower end of the cylindrical wall portion 82. Furthermore, it is preferable to determine the length from the inner peripheral edge of the eaves part 81 to the lower end of the cylindrical wall part 82.

  Furthermore, in the present embodiment, the upper surface of the eave portion 81 is inclined to the lower side of the separation chamber S, thereby preventing powder particles from accumulating on the upper surface of the eave portion 81. When the upper surface of the eaves part 81 is inclined, the inclination angle is preferably 30 to 80 degrees (more preferably 45 to 75 degrees) with respect to the horizontal plane.

  The present invention can be implemented in various other forms without departing from the spirit or main features thereof. Therefore, the above-mentioned embodiment is only a mere illustration in all points, and should not be interpreted limitedly. The scope of the present invention is indicated by the claims, and is not restricted by the text of the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  The present invention is suitably used as a means for pneumatically transporting a granular material.

1 Pneumatic transport device (device of the present invention)
2 apparatus main body 3 opening / closing mechanism 4 introduction pipe 5 discharge pipe 6 bag filter 7 backwashing apparatus 8 turning guide part 80 peripheral circuit 81 eaves part 82 cylindrical wall part 10 nozzle S separation chamber V1 primary container V2 secondary container P1 transport pipe P2 Air suction pipe N Suction nozzle

Claims (4)

An apparatus body having a cylindrical separation chamber inside;
An opening and closing mechanism for opening and closing the bottom of the apparatus body;
Through the side wall surface of the apparatus main body, an introduction pipe communicated from the tangential direction to the inner peripheral surface of the separation chamber;
A discharge pipe communicated with the separation chamber through the top plate of the apparatus body;
A bug filter disposed in the upper part of the apparatus body;
Comprising
After being introduced from the introduction pipe and swirling along the inner wall of the separation chamber, the granular material is introduced into the separation chamber on the air flow toward the discharge pipe, and the opening / closing mechanism is opened at a predetermined timing. By operating, while discharging the particulates deposited on the bottom of the apparatus body,
An air transport device that filters and collects particulate matter contained in the air by passing the air flow toward the discharge pipe through the filter cloth of the bag filter,
An annular eaves portion disposed along the inner wall of the separation chamber above the position where the introduction pipe communicates with the separation chamber;
By a cylindrical cylindrical wall portion extending downward from the inner peripheral edge of the eave portion,
Between the inner peripheral surface of the separation chamber and the outer peripheral surface of the cylindrical wall portion, an annular peripheral circuit is formed in which an upper portion is closed and a lower portion is opened toward the lower portion of the separation chamber,
The flow of air introduced from the introduction pipe is directed to the lower side of the separation chamber while turning along the peripheral circuit, and then to the discharge pipe after passing through the lower end of the cylindrical wall portion. Pneumatic transport device characterized by. The pneumatic transport device according to claim 1,
The pneumatic transport device in which the outer diameter of the cylindrical wall portion is in a range of 0.5 to 0.9 times the inner diameter of the separation chamber. The pneumatic transport device according to claim 1 or 2,
The flow of air introduced from the introduction pipe is swirled at least 1.5 times or more along the peripheral circuit until reaching the lower end of the cylindrical wall portion.
The pneumatic transport apparatus in which the length from the inner periphery of the eaves part to the lower end of the cylindrical wall part is determined. The pneumatic transport device according to any one of claims 1 to 3,
An air transport device in which an upper surface of the eaves portion is an inclined surface that extends downward from the separation chamber.

Images