JP6681673B2 - Dust collector - Google Patents

Description

  The present invention relates to a dust collector that removes dust in an atmosphere with a filter.

  The dust collector captures dust in the air by the filter (hereinafter, referred to as “filtering”) when the air passes through the filter. Therefore, the dust removed from the air accumulates in a state of adhering to the surface of the filter.

  Then, in the dust collector described in Patent Document 1, the dust adhering to the surface of the filter is removed (hereinafter referred to as "dust removal") by making the direction of the air flow reverse to that at the time of filtering.

Fairness 1-235540

  It is an object of the present invention to provide a dust collector that employs a dust removal method different from the dust removal method described in Patent Document 1.

  In order to achieve the above object, the present invention provides a dust collector for removing dust in an atmosphere, wherein a filter (3) for removing dust from the atmosphere taken into the filter chamber (5A) and an atmosphere filter Operation of the blower (11) that takes in the chamber (5A) and generates an airflow that passes through the filter (3), the dust remover (7) that removes the dust adhering to the filter (3), and the dust remover (7) A pressure introducing device (9) which is sometimes operated, and which introduces an air pressure higher than the air pressure in the air passage (15B) into the air passage (15B) downstream of the filter (3). Prepare

  As a result, in the present invention, when the dust remover (7) is operated to perform dust removal, the pressure difference between the downstream side and the upstream side across the filter (3) is reduced. This makes it possible to easily remove the dust that has adhered and accumulated on the surface of the filter (3).

  That is, most of the dust captured by the filter (3) adheres and accumulates on the upstream filter surface. When the blower (11) is operating and air is passing through the filter (3), the atmospheric pressure is higher on the upstream side of the filter (3) than on the downstream side.

  Then, when the blower (11) is in operation, the dust adhering to and depositing on the surface of the filter (3) adheres to the surface of the filter (3) due to the pressure difference. Therefore, there is a problem that it is difficult to remove dust efficiently even if the dust remover (7) is operated while the blower (11) is operating.

  A possible solution to this problem is to stop the blower (11) when operating the dust remover (7) to reduce the pressure difference. However, with this method, the dust remover (7) cannot be operated until the blower (11) is stopped and the pressure difference becomes small.

  On the other hand, in the present invention, since a high atmospheric pressure is introduced into the air passage (15B) on the downstream side when the dust remover (7) is operated, the pressure difference can be reduced without stopping the blower (11). Therefore, it becomes possible to easily remove the dust that has adhered and accumulated on the surface of the filter (3).

  Since the present invention is characterized in that a high atmospheric pressure is introduced into the air passage (15B) on the downstream side when the dust remover (7) is operated, the blower (11) is stopped when the dust remover (7) is operated. Either case or operation may be performed.

  Incidentally, the reference numerals in the parentheses of the above-mentioned means and the like are examples showing the correspondence with the specific configurations and the like described in the embodiments described later, and the present invention is shown in the reference numerals in the parentheses of the above-mentioned means and the like. It is not limited to a specific configuration or the like.

It is sectional drawing which shows the schematic structure of the dust collector 1 which concerns on 1st Embodiment of this invention. It is a figure which shows the structure of the filter 3 used for the dust collector 1 which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the state at the time of filtering of the dust collector 1 which concerns on 1st Embodiment of this invention. It is sectional drawing which shows schematic structure of the dust removal apparatus 7 which concerns on 1st Embodiment of this invention. (A) is sectional drawing which shows the schematic structure of the acceleration device 73 used for the dust collector 1 which concerns on embodiment of this invention. 5B is a cross-sectional view taken along the line AA of FIG. It is an operation | movement explanatory drawing of the acceleration device 73 used for the dust collector 1 which concerns on 1st Embodiment of this invention. It is an operation | movement explanatory drawing of the acceleration device 73 used for the dust collector 1 which concerns on 1st Embodiment of this invention. It is an operation | movement explanatory drawing of the acceleration device 73 used for the dust collector 1 which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the state at the time of dust removal of the dust collector 1 which concerns on 1st Embodiment of this invention. (A) And (b) is sectional drawing which shows schematic structure of the dust collector 1 which concerns on 2nd Embodiment of this invention.

  The “embodiment of the invention” described below shows an example of the embodiment. That is, the matters specifying the invention described in the claims are not limited to the specific configurations and structures shown in the following embodiments.

  Arrows and the like indicating the directions attached to the respective drawings are provided for easy understanding of the mutual relations between the respective drawings. The present invention is not limited to the directions given in the drawings. At least one member or part described with reference numerals is provided, except for cases where “plurality” or “two or more” or the like is not specified. Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
1. Outline of Dust Collection Device As shown in FIG. 1, the dust collection device 1 includes a filter 3, a dust collection casing 5, a dust removal device 7, a pressure introduction device 9, and a blower 11. The dust collector 1 according to the present embodiment is a device for capturing fine particles (hereinafter referred to as dust) in which metal vapor generated during laser processing or welding work is aggregated.

  The filter 3 filters the dust in the air (atmosphere) taken into the dust collecting casing 5 to remove the dust in the air. The filter 3 has a cylindrical core material 3A made of punch metal, a filter paper material 3B folded in a bellows shape (see FIG. 2), and the like, and has a substantially cylindrical shape.

  The air containing dust flows from the outer peripheral surface of the filter 3 toward the core material 3A. Then, when the air passes through the filter paper material 3B, dust is captured by the filter paper material 3B. Therefore, in the filter 3 according to the present embodiment, the captured dust is accumulated on the outer peripheral surface side of the filter 3.

  As shown in FIG. 1, the dust collecting casing 5 constitutes a filter chamber 5A. The filter chamber 5A houses the filter 3. As shown in FIG. 3, the blower 11 takes in air containing dust from the outside of the filter chamber 5A into the filter chamber 5A and also generates an air flow passing through the filter 3.

The air filtered by the filter 3 (filter paper material 3B) flows through the core material 3A, is sucked by the blower 11, and is then discharged to the outside of the dust collector 1.
In addition, one end side (lower end side in the present embodiment) of the filter 3 (core material 3A) in the axial direction is closed by a closing body 3C. Therefore, the filtered air flows through the filter 3 (core material 3A) from one end side to the other end side in the axial direction, that is, from the lower end side to the upper end side.

  As shown in FIG. 1, the blower 11 includes a centrifugal fan 11A, a scroll casing 11B, an electric motor 11C, and the like. The centrifugal fan 11A is a fan through which air passes through in the radial direction of the fan (see JIS B0132 Nos. 1003 and 1004).

  The scroll casing 11B is a spiral casing that houses the centrifugal fan 11A. An intake port 11D is provided at the center of the scroll of the scroll casing 11B. The intake port 11D is opened in a direction parallel to the rotation axis of the centrifugal fan 11A.

  An air outlet 11E that opens in the tangential direction is provided on the outer periphery of the scroll casing 11B. The blower 11 is attached to the partition wall 13 with the opening 13A of the partition wall 13 aligned with the intake port 11D.

  The partition wall 13 partitions the filter chamber 5A and the space in which the blower 11 is housed (hereinafter referred to as the exhaust side space 15A). That is, the discharge side of the blower 11 and the suction side of the blower 11 are partitioned by the partition wall 13. Therefore, the air passage on the downstream side of the filter 3, that is, the intake side space 15B from the inside of the core material 3A to the intake port 11D of the blower 11 is partitioned from the exhaust side space 15A by the partition wall 13.

  The exhaust part 17 that constitutes the exhaust side space 15A is provided with an exhaust port 17A that communicates with the outside. The exhaust port 17A is an opening for exhausting the dust-removed air that has passed through the filter 3 to the outside of the dust collector 1.

  The exhaust port 17A is always in communication with the discharge side of the blower 11 (exhaust side space 15A). That is, the exhaust port 17A communicates with the exhaust side space 15A regardless of whether the dust removing device 7 is operating or not operating.

2. Dust remover 2.1 Overview of dust remover The dust remover 7 removes dust adhering to the surface of the filter 3 (filter paper material 3B). That is, the dust removing device 7 removes the dust adhering to the filter 3 from the filter 3 by accelerating the air flow supplied from the storage unit 71 described later and injecting the accelerated air flow toward the filter 3. .

The dust removed by the dust removing device 7 is collected in the dust collecting portion 19 (see FIG. 1) provided in the lower portion of the filter chamber 5A.
2.2 Configuration of Dust Removal Device The dust removal device 7 has at least a storage unit 71 and an acceleration device 73, as shown in FIG. The pressure storage unit 71 is filled with a pressurized gas. In the present embodiment, the pressure stored by the pump P1 up to about 0.5 MPa is filled in the pressure storage unit 71.

  The acceleration device 73 accelerates the gas with which the pressure storage unit 71 is filled and blows it toward the filter 3. Specifically, the acceleration device 73 has an injection port 73A, a throttle portion 73B, an expansion portion 73D, a valve portion 73E, etc., as shown in FIG.

  The injection port 73A blows the accelerated gas toward the filter 3. The injection port 73A according to the present embodiment is an opening that opens toward the other end side in the axial direction of the filter 3 (upper end side in the present embodiment).

  The throttle unit 73B throttles the airflow emitted from the pressure storage unit 71 to accelerate the airflow. The throttle portion 73B according to the present embodiment is an air passage formed on the outer peripheral side of the cylindrical portion 73F, and always communicates with the pressure storage portion 71. Then, the throttle portion 73B guides air from the pressure storage portion 71 to the throat portion 73C, and the passage cross-sectional area thereof decreases as it approaches the throat portion 73C.

  The cylindrical portion 73F is a cylindrical portion, and the injection port 73A is provided at one axial end (lower end in FIG. 5A) of the cylindrical portion, and the throat portion at the other axial end (upper end in FIG. 5A). 73C is provided.

  The throat portion 73C is a portion of the throttle portion 73B where the flow passage cross-sectional area is the smallest. The throat portion 73C according to the present embodiment includes a plurality of small holes 73G (see FIG. 5B). The expansion section 73D further accelerates the airflow ejected from the throat section 73C by expanding the airflow.

  The valve portion 73E opens and closes the throat portion 73C. The valve portion 73E is composed of a disk-shaped diaphragm that elastically deforms like a disc spring. The valve portion 73E has a radius larger than the inner diameter dimension of the cylindrical portion 73F.

  Then, the valve portion 73E depends on the difference between the pressure acting on one surface (the upper surface in FIG. 5A) and the pressure acting on the other surface (the lower surface in FIG. 5A) of the valve portion 73E. To open and close the throat portion 73C.

2.2 Opening / Closing Operation of Valve Portion The upper surface side of the valve portion 73E can communicate with the pump P1 and the discharge side via the three-way valve V1, as shown in FIG. The three-way valve V1 includes (a) when the upper surface side space C1 of the valve portion 73E communicates with the pump P1 and the discharge side, (b) when the upper surface side space C1 is open to the atmosphere, and (c) the upper surface side space C1. It is a switching valve for selecting one of the cases where the is closed.

<In case of filling the pressure storage unit with air>
When the three-way valve V1 is operated so that the upper surface side space C1, the pump P1 and the discharge side communicate with each other in a state where the pressure of the pressure accumulating portion 71 is lower than the discharge pressure of the pump P1, it acts on the upper surface side of the valve portion 73E. The force due to the applied pressure exceeds the force due to the pressure acting on the lower surface side of the valve portion 73E. Therefore, as shown in FIG. 6, the air supplied from the pump P1 flows through the gap between the outer peripheral edge of the valve portion 73E and the housing 73H and flows into the pressure accumulating portion 71.

  The force due to the pressure acting on the upper surface side of the valve portion 73E is “pressure × area of the upper surface side of the valve portion 73E”. The force due to the pressure acting on the lower surface side of the valve portion 73E is “atmospheric pressure × cross-sectional area of the throat portion 73C + pressure inside the accumulating portion 71 × (area of the lower surface side of the valve portion 73E−cross-sectional area of the throat portion 73C)”. Is.

<Stock pressure>
The three-way valve V1 is operated so that the upper surface side space C1 is sealed when the pressure in the pressure accumulating section 71 becomes equal to the discharge pressure of the pump P1 (see FIG. 7). As a result, the pressurized pressure air is filled in the storage pressure unit 71 and the throttle unit 73B, and the filled state is maintained.

  In the present embodiment, no pressure sensor or the like is provided to detect whether the pressure in the storage unit 71 has become equal to the discharge pressure of the pump P1. When a predetermined time (for example, 2 to 3 seconds) elapses from the time when the three-way valve V1 is operated so that the upper surface side space C1, the pump P1, and the discharge side are communicated with each other, the pressure in the pressure storage unit 71 is the pump The three-way valve V1 is operated on the assumption that the pressure becomes equal to the discharge pressure of P1.

<When blowing out air from the injection port>
The three-way valve V1 is operated so that the upper surface side space C1 is open to the atmosphere. As a result, the force due to the pressure acting on the upper surface side of the valve portion 73E is less than the force due to the pressure acting on the lower surface side of the valve portion 73E, so that the valve portion 73E is separated from the throat portion 73C as shown in FIG. The throat portion 73C opens and the valve portion 73E closes the air passage connected to the pump P1 side.

  Then, the airflow ejected from the pressure storage portion 71 flows along the outer periphery of the cylindrical portion 73F toward the valve portion 73E side, and then flows from the throat portion 73C into the expansion portion 73D. The airflow that has flowed into the expansion section 73D blows out from the injection port 73A toward the filter 3.

3. Pressure Introducing Device 3.1 Outline of Pressure Introducing Device The pressure introducing device 9 is a device that introduces an atmospheric pressure higher than the atmospheric pressure of the intake side space 15B into the intake side space 15B when the dust removing device 7 operates. That is, the pressure introducing device 9 is a device that increases the pressure in the intake side space 15B when the air is blown out from the injection port 73A. Specifically, as shown in FIG. 9, the pressure introducing device 9 introduces the discharge side pressure of the blower 11 into the intake side space 15B when the blower 11 is operating and the dust removing device 7 is operating. .

3.2 Configuration of Pressure Introducing Device As shown in FIG. 9, the pressure introducing device 9 has an on-off valve 9B that opens and closes the communication passage 9A, an actuator 9C that opens and closes the on-off valve 9B, and the like. The communication passage 9A connects the discharge side of the blower 11 and the suction side of the blower 11.

  The communication passage 9A according to the present embodiment is an opening provided in the partition wall 13, and is an opening that allows the exhaust side space 15A and the intake side space 15B to communicate with each other. The actuator 9C opens and closes the open / close valve 9B in conjunction with the operation of the dust removing device 7. That is, the actuator 9C opens the communication passage 9A when removing the dust from the filter 3 and closes the communication passage 9A when not removing the dust.

  The on-off valve 9B is disposed on the discharge side (exhaust side space 15A) of the blower 11 with respect to the communication passage 9A and is displaced. That is, as shown in FIG. 1, the on-off valve 9B is a door-shaped member that is swingably assembled to the partition wall 13.

  The on-off valve 9B is attached to the partition wall 13 with respect to the air flow blown from the blower 11 via a hinge 9D provided on the upstream side. Therefore, as shown in FIG. 9, when the opening / closing valve 9B is located at the position where the communication passage 9A is opened, the opening / closing valve 9B receives the dynamic pressure (wind pressure) from the blower 11 in the direction of closing the communication passage 9A.

  The dust removing device 7, the pressure introducing device 9, and the blower 11 are operation-controlled by a control unit (controller) not shown. The control unit according to the present embodiment operates the dust remover 7 and the pressure introducing device 9 in conjunction with each other without stopping the blower 11 at every predetermined time after the blower 11 starts to operate.

4. Features of the dust collector according to the present embodiment In the present embodiment, when operating the dust remover 7, a pressure higher than that of the intake side space 15B is introduced into the intake side space 15B, so that the filter 3 is sandwiched between the downstream side and the upstream side. The pressure difference between and can be reduced. This makes it possible to easily remove the dust that has adhered and accumulated on the surface of the filter 3.

  That is, most of the dust captured by the filter 3 adheres and accumulates on the filter surface on the upstream side. In the state where the blower 11 is operating and air is passing through the filter 3, the atmospheric pressure is higher on the upstream side of the filter 3 than on the downstream side.

  Then, when the blower 11 is operating, the dust that has adhered and accumulated on the surface of the filter 3 is stuck to the surface of the filter 3 due to the pressure difference. Therefore, there is a problem that it is difficult to remove dust efficiently even if the dust removing device 7 is operated while the blower 11 is operating.

  On the other hand, in the present embodiment, since a high atmospheric pressure is introduced into the intake side space 15B on the downstream side during the operation of the dust removing device 7, the atmospheric pressure difference can be reduced without stopping the blower 11. Therefore, it becomes possible to easily remove the dust that has adhered and accumulated on the surface of the filter 3.

  Since the pressure introducing device 9 is configured to guide the discharge side pressure of the blower 11 to the intake side space 15B, it is possible to raise the atmospheric pressure of the intake side space 15B in a very short time. Therefore, it is possible to remove dust from the filter 3 in a short time without stopping the blower 11 (dust collector 1).

  The on-off valve 9B is disposed on the discharge side (exhaust side space 15A) with respect to the communication passage 9A, so that the discharge pressure of the blower 11 can be utilized to reliably close the communication passage 9A. Therefore, it is possible to reduce a ventilation loss such as a reduction in the amount of ventilation at the time of filtering.

  That is, at the time of filtering, the atmospheric pressure on the discharge side (exhaust side space 15A) becomes higher than the atmospheric pressure on the intake side (intake side space 15B). Therefore, if the on-off valve 9B is arranged on the intake side (intake-side space 15B) with respect to the communication passage 9A, the on-off valve 9B may slightly move due to the pressure difference between the exhaust-side space 15A and the intake-side space 15B. May open. If the on-off valve 9B is opened slightly, the air volume taken into the filter chamber 5A, that is, the air volume passing through the filter 3 may decrease.

  On the other hand, in the present embodiment, since the on-off valve 9B is arranged on the discharge side (exhaust side space 15A) with respect to the communication passage 9A, the pressure difference between the exhaust side space 15A and the intake side space 15B. Applies a force for closing the communication passage 9A to the on-off valve 9B. Therefore, in this embodiment, it is possible to suppress a decrease in the air flow rate during filtering.

  As shown in FIG. 9, the on-off valve 9B according to the present embodiment is configured to receive the dynamic pressure from the blower 11 in the direction to close the communication passage 9A when the on-off valve 9B is located at the position where the communication passage 9A is opened. . Thereby, the on-off valve 9B can be surely closed by utilizing the dynamic pressure, so that the air loss can be surely reduced.

  Further, in the acceleration device 73 according to the present embodiment, the airflow flowing out of the pressure storage unit 71 is throttled by the throttle unit 73B and reaches the throat unit 73C while increasing the flow velocity. The airflow ejected from the throat portion 73C to the inflating portion 73D is inflated in the inflating portion 73D, so the airflow is ejected toward the filter 3 at once in a very short time of less than 1 second, and the speed of sound is equal to or higher than the speed of sound. Can be accelerated to subsonic speeds.

  Therefore, the air jetted from the jet port 73 </ b> A behaves like a “lump” having the same mass as the mass of the air stored in the storage unit 71. That is, the airflow having a shock wave or energy close to the shock wave (hereinafter, including the air flow is referred to as “shock wave”) is radiated from the injection port 73A to the filter 3.

  Therefore, the filter 3 is in a state of being struck by the above-mentioned shock wave (mass of air), and the dust attached to the filter 3 is dropped from the filter 3 and removed by the shock. It should be noted that dust can be more reliably removed by accelerating the flow velocity of the air injected from the injection port 73A to a speed equal to or higher than the sonic speed or a subsonic speed.

(Second embodiment)
The pressure introducing device 9 according to the first embodiment has a configuration in which the discharge side pressure of the blower 11 is guided to the intake side space by connecting the discharge side of the blower 11 and the suction side of the blower 11.

  On the other hand, in the pressure introducing device 9 according to the present embodiment, as shown in FIG. 10B, the discharge side pressure of the blower 11 is closed by the opening / closing valve 9B, so that the discharge side pressure of the blower 11 is changed to the intake side. It is a structure that leads to space.

  That is, in the present embodiment, as shown in FIG. 10A, the discharge side of the blower 11 is open when the dust removing device 7 is not operating. During operation of the dust removing device 7, as shown in FIG. 10B, the plate-shaped on-off valve 9B is slid and displaced, and the discharge side of the blower 11 is closed.

  When the discharge side is blocked while the blower 11 is operating, the air discharged from the blower 11 collides with the on-off valve 9B and a pressure wave is generated. The pressure wave propagates in the scroll casing 11B from the discharge side toward the suction side.

  Therefore, also in the present embodiment, the discharge side pressure of the blower 11 is guided to the intake side space 15B, so that the air pressure in the intake side space 15B can be raised in a very short time. As a result, the filter 3 can be removed in a short time without stopping the blower 11 (dust collector 1).

(Other embodiments)
In the above-described embodiment, the discharge side of the blower 11, that is, the atmospheric pressure of the exhaust side space 15A is guided to the intake side space 15B, but the present invention is not limited to this. That is, since it is sufficient to introduce the high atmospheric pressure of the intake side space 15B into the downstream side of the filter 3, for example, the atmospheric pressure may be introduced into the downstream side of the filter 3.

  In the above-described embodiment, the on-off valve 9B is disposed on the discharge side (exhaust side space 15A) with respect to the communication passage 9A, but the present invention is not limited to this, and the on-off valve 9B is the communication passage. It may be arranged on the suction side (intake side space 15B) with respect to 9A.

  The on-off valve 9B according to the above-described embodiment is configured to receive the dynamic pressure in the direction of closing the communication passage 9A from the blower 11 when the on-off valve 9B is located at the position where the communication passage 9A is opened. It is not limited to.

  The blower 11 according to the above-described embodiment is arranged in the exhaust side space 15A and sucks air from the intake side space 15B to generate an air flow passing through the filter 3, but the present invention is not limited to this. However, the air flow passing through the filter 3 may be generated by sucking air containing dust from the outside of the dust collector 1 and blowing it out into the filter chamber 5A.

The blower 11 according to the above-described embodiment is a blower using a centrifugal fan, but the present invention is not limited to this, and may be a blower using an axial fan, for example.
The dust removing device 7 according to the above-described embodiment has a method of causing “a mass of air blown at high speed” to collide with the filter 3, but the present invention is not limited to this and, for example, Japanese Patent Laid-Open No. 2010-89027. The dust remover described in the publication may be used.

In the above-described embodiment, the dust collecting apparatus 1 according to the present invention has been described by taking the dust collecting apparatus that collects “fine particles formed by aggregation of metal vapor” as dust, but the application of the present invention is not limited to this. Not something.

  That is, for example, the present invention is also applied to a dust remover for removing deposits adhering to the surface of machine structures, buildings, etc., or a dust collector for collecting dust of metal powder or polishing dust generated during machining. it can.

  Further, the present invention is not limited to the above-described embodiment as long as it matches the gist of the invention described in the claims.

1 ... Dust collector 3 ... Filter 3A ... Core material 3B ... Filter paper material 3C ... Closure body 5 ... Dust collection casing 5A ... Filter chamber 7 ... Dust remover 9 ... Pressure introduction device 9A ... Communication passage 9B ... Open / close valve 9C ... Actuator 9D ... Hinge 11 ... Blower 11A ... Centrifugal fan 11B ... Scroll casing 11D ... Intake port 11E ... Outlet port 13 ... Partition wall 13A ... Opening part 15A ... Exhaust side space 15B ... Intake side space 17 ... Exhaust part 17A ... Exhaust port 19 ... Collection Dust part 71 ... Accumulation part 73 ... Accelerator 73A ... Injection port 73B ... Throttling part 73D ... Expansion part 73F ... Cylindrical part 73C ... Throat part 73G ... Small hole 73E ... Valve part 73H ... Housing

Claims (5)

In a dust collector that removes dust in the atmosphere,
A filter that captures dust in the atmosphere taken into the filter chamber,
A blower that takes in an atmosphere into the filter chamber and generates an airflow that passes through the filter,
A dust remover for removing dust adhering to the filter,
When the side opposite to the "side where the captured dust is accumulated" and "the downstream side of the filter" is sandwiched between the filters, it is a pressure introducing device that operates when the dust removing device operates, and is a downstream side of the filter. By introducing an air pressure higher than the air pressure in the air passage into the air passage, a pressure introducing device for reducing the pressure difference between the downstream side across the filter and the "side where the captured dust accumulates". Equipped with
The pressure introducing device,
An on-off valve that opens and closes the discharge side of the blower, and an actuator that opens and closes the open-close valve, wherein the open-close valve is opened when the dust removing device is not operating, and the discharge side of the blower is in an open state, and When the dust remover is in operation, it has an actuator that closes the on-off valve to close the discharge side of the blower,
When the discharge side is closed during operation of the blower, air discharged from the blower collides with the on-off valve to generate a pressure wave, and the pressure wave passes through the blower and the discharge side of the blower. By propagating to the air passage on the downstream side of the filter from the suction side, a pressure higher than the atmospheric pressure in the air passage is introduced into the air passage on the downstream side ,
Furthermore, the filter has a substantially cylindrical shape, and one end side in the axial direction is closed,
The dust remover accelerates the airflow to a sonic speed or higher or a subsonic speed, injects the accelerated airflow from the other axial end of the filter toward the inside of the filter to generate a shock wave by the air flow, and the shock wave dust collector according to claim to Rukoto and characterized in that the removal of material adhering to the filter by using a.   The dust collector according to claim 1, wherein the opening / closing valve opens / closes a discharge side of the blower by sliding displacement of a plate-shaped member. The dust removing device,
A storage unit filled with pressurized gas,
An accelerating device having an injection port that blows out the gas toward the filter, wherein a throttle portion that throttles the air flow discharged from the pressure storage portion, and a throat portion that has the smallest flow passage cross-sectional area of the throttle portion. And an accelerating device for accelerating the airflow to a sonic speed or higher or a subsonic speed, the expansion unit expanding the generated airflow, and the valve unit opening and closing the throat. The dust collector according to 1 or 2 . The dust collector according to any one of claims 1 to 3 , wherein the blower includes a centrifugal fan, a scroll casing, and an electric motor. The dust collector according to any one of claims 1 to 4 , wherein the filter is capable of capturing fine particles in which metal vapor is agglomerated.

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