JP2009249172A - Double damper type continuous-suction pneumatic transport device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve powder transport capacity, by preventing sticking-deposition of powder on a bypass pipe, when pneumatically transporting fine powder such as carbon black, by using a double damper type continuous-suction pneumatic transport device having the bypass pipe. <P>SOLUTION: A filter 112 with a backwash mechanism 110 is arranged in the bypass pipe 90, and atmospheric pressure is applied to the filter 112 via a second bypass pipe 100 when opening a second damper module 20. A compressed air pulse is applied to the filter 112 by operating the backwash mechanism 110, and the filter is effectively washed back by increasing a pressure difference before and after the filter. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an improvement of a double damper type continuous suction type pneumatic transportation device capable of transporting powder continuously and efficiently without interruption.

There is provided a double damper type continuous suction type air transport device including an upper suction / solid-gas separation module, an intermediate first damper module, and a lower second damper module (Japanese Patent Laid-Open No. 2004-189475). ). In this apparatus, a first bypass pipe for introducing negative pressure into the intermediate chamber of the first damper module and a second bypass pipe for introducing atmospheric pressure into the intermediate chamber are provided. By making the pressure before and after the damper and the second damper the same pressure, these dampers can be opened quickly, thereby greatly improving the powder transport capability of the pneumatic transport device.

There is an increasing demand to pneumatically transport a very large amount of very fine powder or ultrafine particles having a particle size of submicron such as carbon black by using such a double damper type continuous suction type pneumatic transportation device.
However, if the degree of vacuum applied to the suction / solid-gas separation module is increased in order to increase the transport amount, fine powder adheres to the inside of the bypass pipe of the damper module, thereby blocking the bypass pipe. There is a problem that the deadline of the bypass control valve occurs and the powder transportation capacity cannot be increased as desired.

  An object of the present invention is to provide a double damper type continuous suction type pneumatic transport apparatus suitable for continuously pneumatically transporting a powder having a submicron particle size such as carbon black.

  The present invention includes an upper suction / solid-gas separation module, an intermediate first damper module, and a lower second damper module, and the negative suction in the suction / separation chamber of the suction / solid-gas separation module at a first timing. A first bypass line for introducing pressure into the intermediate chamber of the first damper module, and a second bypass line for introducing atmospheric pressure into the intermediate chamber of the first damper module at the second timing In the double damper type continuous suction type pneumatic transportation apparatus: a filter with a backwashing mechanism is provided in the first bypass line in the vicinity of the first damper module, and the second bypass line is opened when the second damper module is opened. The atmospheric pressure is applied to the filter through the pressure, and the backwashing mechanism is activated to apply the compressed air pulse to the filter. It is characterized in that so as to backwash the filter effectively by increasing the.

Embodiments of the pneumatic transport device of the present invention will be described with reference to the accompanying drawings.
Referring to FIG. 1, this pneumatic transport device 10 can be used to pneumatically transport powder contained in a container 12 as a powder source to another container (transport destination container) 14. Containers 12 and 14 may be hoppers or any other shape / type of container.

  In the illustrated embodiment, the pneumatic transport device 10 is an upper stage as a solid-gas separation cyclone separator in order to facilitate manufacture and assembly of the device and to allow easy disassembly of components for cleaning and cleaning. The solid-gas separation module 16, the middle first damper (discharge valve) module 18, and the lowermost second damper module 20, which are a plurality of buckle devices 22 and other connecting means. Are separably connected.

  As can be seen from FIG. 2, the separation module 16 includes a cylindrical body 24 formed of stainless steel, a top cover 26 formed of stainless steel, and a filter support to which one or more filter elements 28 are attached. And a plate 30. The filter support plate 30 is sandwiched between the main body 24 and the top cover 26, and the main body 24 and the top cover 26 are connected to each other by a plurality of buckle devices 32.

  As can be seen from FIGS. 1 and 2, the filter element 28 is suspended from the filter support plate 30 by, for example, being inserted into the circular opening of the filter support plate 30 from above and having the upper flange supported by the filter support plate 30. is there. The number of filter elements 28 can be increased or decreased as appropriate, and bag filters or other types of filters may be used in place of the filter elements 28.

A suction / separation chamber 34 for sucking and solid-separating a mixture of air and powder is defined inside the cylindrical main body 24. The suction / separation chamber 34 is welded to the main body 24 by welding or the like. The attached air inlet pipe 36 opens in the tangential direction.
The circular lower opening 38 of the main body 24 functions as a powder discharge port for discharging the powder solid-gas separated in the suction / separation chamber 34.

Referring to FIG. 1, in the illustrated embodiment, a backwash valve chamber 42 in which a backwash valve 40 is disposed is defined inside the top cover 26 of the separation module 16, and the filter element 28 is periodically formed. It is designed to backwash.
A conventional quick exhaust valve can be used as the backwash valve 40, and each backwash valve 40 is made to face the upper opening of the filter element 28.

As shown, each backwash valve 40 is connected on one hand to an accumulator 46 connected to an air compressor 44 via a joint 45 and piping, and on the other hand, a pipe joint 47 and an air signal pipe 48. It is connected to the control device 50 via.
The compressed air from the air compressor 44 is accumulated in the accumulator 46 while the signal pressure applied from the air signal pipe 48 to the quick exhaust valve 40 is high. When the control device 50 reduces the signal pressure, the quick exhaust valve 40 opens the accumulator 46 and injects compressed air toward the inlet opening of the filter element 28 to perform backwashing of the filter element 28. The controller 50 can be configured to perform backwashing of the filter element 28 alternately and periodically.

The top cover 26 is provided with an air outlet pipe 52, and the outlet of the air outlet pipe 52 is connected to a negative pressure source 54. As the negative pressure source 54, a blower such as a turbo blower, a roots blower or a multistage ring blower, an ejector type vacuum pump, or any other type of vacuum pump can be used. The negative pressure from the negative pressure source can be controlled by a shutoff valve 56 controlled by the control device 50.
When the shut-off valve 56 is opened with the blower 54 activated, the mixture of air and powder is sucked into the suction / separation chamber 34 from the air inlet pipe 36, and the dust-containing air is filtered by the filter element 28 and sucked. The powder separated from the air in the separation chamber 34 falls toward the first damper module 18.

  Referring to FIG. 3, the first damper module 18 includes a cylindrical main body 58 formed of stainless steel or the like and having a lower flange, a discharge cone or hopper 60 formed of stainless steel or the like, and a lower portion of the discharge cone 60. And a damper (discharge valve) device 62 for opening and closing the outlet opening. An intermediate chamber 64 is defined inside the main body 58 below the damper device 62.

In the illustrated embodiment, the damper device 62 includes a flap valve type circular discharge valve body 66 capable of sealing the lower outlet opening of the discharge cone 60 and a roller 68 for swinging the discharge valve body 66 upward. A swing arm 70 and a 90-degree swing vane type aerodynamic actuator 72 for swinging the swing arm 70 are provided.
The discharge valve body 66 is attached to, for example, a pair of left and right swing arms 74, and ends of the swing arms 74 are pivotally attached to a mounting bracket 76 fixed to the discharge cone 60 by welding or the like via a pivot 78. can do.
An elastomer seal ring 80 is mounted on the lower edge of the discharge cone 60 so as to seal between the discharge cone 60 and the discharge valve body 66. In order to ensure that the seal ring 80 is sealed even if the seal ring 80 is worn or worn, the pivot 78 of the mounting bracket 76 (not shown) is provided so that the pivot shaft 78 of the swing arm 74 can move slightly in the vertical direction. )).

  The swing arm 70 with the roller 68 is pivotally attached to the mounting bracket 76 via the output shaft 82 of the actuator 72. The pneumatic actuator 72 can be controlled by the control device 50 via the air signal line 84 (FIG. 1).

  As shown in FIG. 1, the main body 58 of the first damper module 18 is provided with a pressure introducing pipe 86 communicating with the intermediate chamber 64, and this pressure introducing pipe 86 is provided in the negative body 24 provided on the main body 24 of the separation module 16. The pressure extraction pipe 88 is connected by a first bypass line 90. The first bypass pipe 90 is provided with a shutoff valve (first bypass valve) 92 controlled by the control device 50, and the negative pressure in the suction / separation chamber 34 of the separation module 16 is opened by opening the first bypass valve 92. Pressure is introduced into the intermediate chamber 64 of the first damper module 18.

The second damper module 20 is also configured in the same manner as the first damper module 18, and a duplicate description is omitted. As shown in FIG. 1, the second damper module 20 includes a second damper device 94 that opens and closes a lower outlet opening of the discharge cone. The pneumatic actuator 72 of the second damper device 94 includes an air actuator. It is controlled by the control device 50 via the signal line 96.
The main body of the second damper module 20 is provided with an atmospheric pressure extraction pipe 98, and this atmospheric pressure extraction pipe 98 is connected to the pressure introduction pipe 86 of the first damper module 18 by a second bypass line 100. . The second bypass pipe 100 is provided with a shut-off valve (second bypass valve) 102 controlled by the control device 50, and the atmospheric pressure in the second damper module 20 is reduced by opening the second bypass valve 102. 1 damper module 18 is introduced into the intermediate chamber 64.

  Referring to FIG. 1, a filter 112 having a backwashing mechanism 110 is provided between the pressure introduction pipe 86 of the first damper module 18 and the end of the first bypass line 90. The backwashing mechanism 110 can be constituted by a quick exhaust valve similar to the quick exhaust valve 40 of the suction / separation module 16, and can be connected to the accumulator 46 through the compressed air pipe 114. The backwashing mechanism 110 is controlled by the control device 50 via the air signal tube 116, and in operation, the filter 112 is backwashed by injecting compressed air pulses inside the filter 112. The controller 50 is programmed to activate the backwash mechanism 110 when the second damper module 20 is opened.

Next, the mode of use and operation of the pneumatic transport device 10 will be described with reference to the flowchart of FIG.
As shown in FIG. 1, the pneumatic transport apparatus 10 is installed on the transport destination container 14, and the air inlet pipe 36 of the separation module 16 is a hopper that contains the powder to be transported by air via the pneumatic transport pipe 104. 12 suction nozzles 108 inserted into the lower outlet 106.

  When the blower 54 and the air compressor 44 are operated, the shut-off valve 56 is opened with the first damper device 62 and the second damper device 94 closed, and the suction / separation chamber 34 is sucked by the blower 54, the powder in the hopper 12 Is sucked into the suction / separation chamber 34 through the suction nozzle 108, the air transport pipe 104, and the air inlet pipe 36 together with air, and the powder separated from the air in the suction / separation chamber 34 by the cyclone principle is the first. It falls towards the damper module 18 and accumulates on its discharge cone 60. Dust-containing air sucked into the blower 54 from the suction / separation chamber 34 is filtered by the filter element 28. The filter element 28 is periodically backwashed.

The suction and pneumatic transportation of the powder from the hopper 12 to the suction / separation chamber 34 can be continuously performed as necessary. In order to realize highly efficient pneumatic transportation, it is preferable to suck the powder under a high vacuum.
During suction, the suction / separation chamber 34 of the separation module 16 is under high vacuum, and the intermediate chamber 64 of the first damper module 18 is under atmospheric pressure as will be described later. Therefore, the discharge valve body 66 is pressed against the seal ring 80 of the discharge cone 60 by the differential pressure between the vacuum acting on the upstream side of the discharge valve body 66 of the first damper module 18 and the atmospheric pressure acting on the downstream side. The gap between the discharge cone 60 and the discharge valve body 66 is perfectly sealed.

By opening the first bypass valve 92 of the bypass conduit 90 at a predetermined timing, the suction / separation chamber 34 of the separation module 16 and the intermediate chamber 64 of the first damper module 18 are electrically connected by the bypass conduit 90. The negative pressure in the suction / separation chamber 34 is introduced into the intermediate chamber 64 of the first damper module 18.
In other words, the air in the intermediate chamber 64 of the first damper module 18 flows through the filter 112 and the bypass line 90 to the suction / separation chamber 34 of the separation module 16. There is a filter 112 between the bypass pipe 90 and the pressure introduction pipe 86, and dust-containing air flowing into the bypass pipe 90 from the intermediate chamber 64 is filtered by the filter 112. Powder does not adhere to the first bypass valve 92.
Thus, when the negative pressure in the suction / separation chamber 34 is introduced into the intermediate chamber 64 of the first damper module 18, the differential pressure before and after the discharge valve body 66 of the first damper module 18 disappears. The first bypass valve 92 is closed and the bypass pipe line 90 is shut off at a predetermined timing when the differential pressure almost disappears.

The actuator 72 of the first damper device 62 is operated almost simultaneously with the opening of the first bypass valve 92 or at a predetermined timing after the valve opening, and the swing arm 70 with the roller 68 as shown by a chain line in FIG. The discharge valve body 66 is released by swinging downward. Then, as shown by the chain line in FIG. 3, the discharge valve body 66 swings downward by the action of its own weight and the weight of the powder deposited thereon, and opens the valve.
As described above, the differential pressure before and after the discharge valve body 66 of the first damper module 18 disappears at this point, so when the discharge valve body 66 is released by swinging the swing arm 70 downward. The discharge valve body 66 opens quickly and smoothly due to its own weight and powder weight.

With the opening of the discharge valve body 66, the powder deposited on the discharge cone 60 of the first damper module 18 is dropped into the intermediate chamber 64, and the discharge cone of the second damper module 20 in the lower stage is dropped. Accumulate on top.
After the valve opening of the first damper device 62, after a predetermined time (for example, 2 to 5 seconds) necessary to allow the powder to be discharged from the discharge cone 60 has elapsed, the actuator 72 is swung in the opposite direction to perform the first operation. The damper device 62 is closed.

  Next, by opening the second bypass valve 102 of the second bypass conduit 100 at a predetermined timing, the intermediate chamber 64 of the first damper module 18 and the space below the discharge valve of the second damper module 20 Is conducted by the second bypass conduit 100. Thereby, the air under atmospheric pressure in the transport destination container 14 is introduced into the intermediate chamber 64 under a negative pressure. At this time, air under atmospheric pressure in the transport destination container 14 flows through the bypass line 100 and the filter 112 to the intermediate chamber 64 of the first damper module 18 under negative pressure. It should be noted that this air flow flows in the direction of backwashing the filter 112.

Almost simultaneously with the opening of the second bypass valve 102, the control device 50 operates the backwashing mechanism 110 via the air signal pipe 116 to inject compressed air pulses inside the filter 112.
Thus, as the second bypass valve 102 is opened, air under atmospheric pressure in the transport destination container 14 flows through the filter 112 toward the intermediate chamber 64 of the first damper module 18 that has been under negative pressure. In addition to trying, compressed air pulses are injected inside the filter 112 so that the pressure difference across the filter 112 (ie, inside and outside) is significantly amplified. Therefore, the filter 112 is effectively backwashed.

  Further, as a result of opening the second bypass valve 102, the differential pressure before and after the discharge valve body of the second damper module 20 disappears. The shutoff valve 102 is closed at a predetermined timing when the differential pressure has almost disappeared, and the second bypass pipe line 100 is shut off.

At substantially the same time as the opening of the second bypass valve 102 or at a predetermined timing after the valve opening, the actuator of the second damper device 94 is operated to swing the swing arm downward, and the second damper device 94 By releasing the discharge valve body, the discharge valve body is allowed to open due to its own weight and powder weight.
In the same manner as described above for the first damper device 62, the differential pressure before and after the discharge valve body of the second damper module 20 disappears at this time, so the discharge valve body of the second damper device 94 was released. Sometimes the discharge valve opens quickly and smoothly due to its own weight and powder weight.

  Next, after the valve opening of the second damper device 94, a predetermined time (for example, 2) necessary to allow the powder accumulated in the discharge cone of the second damper module 20 to fall into the destination container 14 is dropped. After 5 seconds), the actuator of the damper device 94 of the second damper module 20 is actuated to close the discharge valve.

  By repeating the above steps, the pneumatic transportation of the powder from the hopper 12 to the transport destination container 14 can be performed continuously and efficiently without interruption.

An air transportation test of carbon black having a particle size of submicron was performed using an air transportation machine without a filter with a backwashing mechanism of the present invention. When continuous operation was performed for 2 days at a conveyor vacuum level of -20 Kpa and a conveying air wind speed of 2.9 m, no powder adhered to the bypass line, but the conveyor vacuum level was -50 Kpa and the wind speed was 5.8 m. When the operation was performed, a large amount of powder adhered to the bypass line in 1 to 2 hours.
On the other hand, continuous operation was performed for 2 days at a conveyor vacuum degree of -50 Kpa and a wind speed of 5.8 m using the pneumatic transporting machine provided with the filter with the backwashing mechanism of the present invention shown in FIG. There was no noticeable powder adhesion or deposition on the surface.

  According to the present invention, in the double damper type continuous suction type pneumatic transportation apparatus, the bypass pipe is provided with a filter with a backwashing mechanism. 1) Dust-containing air flowing into the bypass pipe from the intermediate chamber of the damper module is filtered. This prevents the powder from adhering to the inside of the bypass line, and 2) when the atmospheric pressure is introduced into the intermediate chamber of the damper module, the backwash mechanism is activated to inject the compressed air pulse. Because the pressure difference between the front and back of the filter is increased and the filter is backwashed effectively to keep the bypass line clean, the damper module can be operated quickly, The powder transport capability can be greatly improved.

  Although specific embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various changes and modifications can be made. For example, a filter with a backwashing mechanism is also provided between the atmospheric pressure extraction pipe 98 of the second damper module 20 and the second bypass pipe 100, and powder is deposited inside the second bypass pipe 100. Can be prevented.

It is a partially cutaway side view of the pneumatic transport device of the present invention. It is a disassembled perspective view of the isolation | separation module of the pneumatic transport apparatus shown in FIG. FIG. 2 shows a part of the damper module of the pneumatic transportation device shown in FIG. 1, (A) is a perspective view from obliquely below, and (B) is a partially cutaway side view. It is a flowchart which shows operation | movement of a pneumatic transport apparatus.

Explanation of symbols

10: Pneumatic transport device 12: Hopper 14: Destination container 16: Separation module 18: First damper module 20: Second damper module 34: Suction / separation chamber of the separation module 62: First damper device 64: Intermediate chamber 90: First bypass passage 94: Second damper device 100: Second bypass passage 110: Backwash mechanism 112: Filter

Patent Applicant YMS Co., Ltd. Inventor Takeshi Arai Agent Patent Attorney Hiroshi Ito

Claims (1)

The upper suction / solid-gas separation module (16), the middle first damper module (18), and the lower second damper module (20) are provided, and the suction / solid-gas separation module is sucked at the first timing. A first bypass line (90) for introducing negative pressure in the separation chamber into the intermediate chamber of the first damper module, and a second for introducing atmospheric pressure into the intermediate chamber of the first damper module at a second timing. In a double damper type continuous suction pneumatic transport device (10) with a bypass line (100) of:
A filter (112) with a backwash mechanism (110) is provided in the first bypass line (90) in the vicinity of the first damper module, and when the second damper module (20) is opened, the second bypass line ( 100), the atmospheric pressure is applied to the filter (112), and the backwash mechanism (110) is operated to apply the compressed air pulse to the filter (112), thereby increasing the pressure difference before and after the filter. A double damper type continuous suction type air transportation device characterized in that the filter is effectively backwashed.

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