JP5984509B2 - Hazardous substance removal equipment - Google Patents

Description

  The present invention relates to a harmful substance removal apparatus used for removing harmful substances such as radioactive substances present in air.

  For example, when various kinds of work are performed in a nuclear power plant, it is necessary to ensure a working environment free from harmful substances such as radioactive substances. In this case, an apparatus capable of removing harmful substances such as radioactive substances is used.

  As a conventional harmful substance removal apparatus, for example, there is one described in Patent Document 1 below. In this iodine removal local exhaust apparatus described in Patent Document 1, a mixing chamber, a first filter chamber, and a second filter chamber are arranged in series and connected with bolts, and the outlet side of the second filter chamber is sucked. A demister filter that removes mist is disposed while an external air introduction port and a connection port are provided in the mixing chamber, which is connected to a fan suction portion.

Japanese Patent Laid-Open No. 11-101893

  In the above-described conventional iodine removal local exhaust apparatus as a harmful substance removal apparatus, a mixing chamber, a first filter chamber, and a second filter chamber are connected in series, and a suction fan is connected to the second filter chamber. In this case, each of the mixing chamber, the first filter chamber, the second filter chamber, and the suction fan is configured to be movable with casters. There is a problem that replacement of parts such as filters is troublesome.

  The present invention solves the above-described problems, and an object of the present invention is to provide a harmful substance removing apparatus that facilitates replacement of components and improves workability in maintenance work.

  In order to achieve the above object, a hazardous substance removing apparatus of the present invention is connected to a main body, a blower disposed in the main body, and a suction portion of the blower, and is detachable from the main body and the blower. And a filter unit having a built-in filter that can remove harmful substances from the inhaled air.

  Therefore, the filter unit can be detachably arranged with respect to the main body and the blower, so that the filter unit can be reduced in size and weight, and maintenance work such as filter replacement can be easily performed. This makes it possible to facilitate the replacement work of the constituent members and improve the workability in the maintenance work.

  The harmful substance removing apparatus of the present invention is characterized in that the blower is detachably disposed with respect to the main body.

  Therefore, by disposing the blower detachably with respect to the main body, the blower can be reduced in size and weight can be reduced, and the replacement work of the blower can be facilitated.

  In the harmful substance removing apparatus of the present invention, the filter unit includes a frame, a storage box that has an opening and a discharge part, and is detachable from the frame. The filter unit is inserted into the storage box through the opening. It is characterized by having a pre-filter and hepa filter that can be stored, and a lid that has a suction portion and can close the opening.

  Therefore, by disposing the filter unit from a plurality of members and housing a plurality of filters therein, the filter unit can be easily disassembled and the filter can be replaced.

  In the harmful substance removal apparatus of the present invention, a differential pressure sensor for measuring a pressure difference between the discharge part of the blower and the suction part of the filter unit is provided, and the suction part of the filter unit and the differential pressure sensor are connected to each other. It is characterized in that the air path to be divided is provided so as to be split.

  Therefore, by measuring the pressure difference between the discharge part of the blower and the suction part of the filter unit by the differential pressure sensor, it is possible to properly determine the replacement time of the filter, and to remove harmful substances efficiently. Since the air path can be divided, the filter unit can be easily detached from the blower when replacing the filter unit.

  The harmful substance removing apparatus of the present invention is characterized in that a dust filter capable of collecting dust is provided at the suction portion of the filter unit, and a suction hose is connectable.

  Therefore, not only harmful substances in the air but also harmful substances scattered in the vicinity can be sucked in by the suction hose and removed by the dust filter, and can be applied to many applications.

  According to the harmful substance removal apparatus of the present invention, the main body, the blower disposed in the main body, and the harmful substance from the inhaled air connected to the suction portion of the blower and detachably disposed on the main body and the blower. Since the filter unit in which the filter capable of removing the filter is incorporated is provided, the replacement work of the constituent members can be facilitated and the workability in the maintenance work can be improved.

FIG. 1 is a side view showing a hazardous substance removing apparatus according to an embodiment of the present invention. FIG. 2 is a side view of the main body in the harmful substance removing apparatus of this embodiment. FIG. 3 is a plan view of the main body in the harmful substance removing apparatus of the present embodiment. FIG. 4 is a rear view of the main body in the harmful substance removing apparatus of the present embodiment. FIG. 5 is a side view of the filter unit with the lid removed in the harmful substance removal apparatus of the present embodiment. FIG. 6 is a front view of the filter unit with the lid removed. FIG. 7 is a side view of the lid of the filter unit in the harmful substance removing apparatus of this embodiment. FIG. 8 is a front view of the lid of the filter unit. FIG. 9 is a front view of a storage case for conveying the main body and the blower. FIG. 10 is a front view of a storage case for transporting the filter unit. FIG. 11 is a side view showing another application example in the hazardous substance removing apparatus of this embodiment.

  Exemplary embodiments of a hazardous substance removing apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example, Moreover, when there exists multiple Example, what comprises combining each Example is also included.

  FIG. 1 is a side view showing a harmful substance removing apparatus according to an embodiment of the present invention, FIG. 2 is a side view of a main body in the harmful substance removing apparatus of this embodiment, and FIG. FIG. 4 is a rear view of the main body of the harmful substance removal apparatus of the present embodiment, and FIG. 5 is a view of the filter unit with the lid removed in the harmful substance removal apparatus of the present embodiment. 6 is a front view of the filter unit with the lid removed, FIG. 7 is a side view of the lid of the filter unit in the harmful substance removing apparatus of this embodiment, and FIG. 8 is a front view of the lid of the filter unit. 9 is a front view of a storage case for transporting the main body and the blower, FIG. 10 is a front view of a storage case for transporting the filter unit, and FIG. 11 is a toxic substance removal apparatus of the present embodiment. It is a side view showing another application example

  As shown in FIG. 1, the harmful substance removal apparatus 10 of the present embodiment has a main body 11, a blower 12, and a filter unit 13, and the main body 11, the blower 12, and the filter unit 13 are divided. It is configured to be detachable.

  As shown in FIGS. 2 to 4, the main body 11 includes a pair of left and right first support pieces 21 connected by three connecting pieces 22 to form a horizontal base 23, and a vertical direction is formed at the rear end of the base 23. A pair of left and right second support pieces 24 are integrally connected along the line. The gantry 23 is provided with casters 26 on the lower, front, rear, left, and right via brackets 25, and the two casters 26 at the rear have locks 27. In addition, each second support piece 24 is connected to the gantry 23 (first support piece 21) at a substantially right angle (90 degrees), and is connected to a connecting portion between the first support piece 21 and the second support piece 24. The reinforcing member 28 is fixed, and an anti-slip member (elastic member such as rubber) 24 a is fixed to the second support piece 24.

  The main body 11 has a handle 29 fixed to left and right sides of the gantry 23 (each first support piece 21). Each handle 29 is fixed while being shifted in the front-rear direction, and the operator can lift the main body 11 using the handle 29. Further, in the main body 11, a pair of left and right mounting pieces 30 are fixed between two connecting pieces 22 in the gantry 23, and three mounting holes 31 are formed in each mounting piece 30. In the main body 11, two attachment pieces 32 are fixed to the respective side portions of the left and right first support pieces 21 in the gantry 23, and screw holes 33 are formed in the attachment pieces 32, respectively.

  As shown in FIG. 1, the blower 12 is configured such that a fan (not shown) is rotatably accommodated in a hollow casing 41, and the fan can be blown by a motor 42. Further, the blower 12 is provided with a suction portion 43 having a cylindrical shape on the front side of the casing 41, and a discharge portion 44 is provided on the side of the casing 41. The blower 12 is provided with a power cord 45 that supplies power to the motor 42.

  The blower 12 is detachably disposed on the mount 23 of the main body 11. That is, in the blower 12, the substrate 47 is integrally provided at the lower portion of the casing 41 via the mounting base 46. In the blower 12, the substrate 47 is placed at a predetermined position on the gantry 23 of the main body 11, and the six fixing bolts 48 are formed in the mounting holes 31 formed in the mounting pieces 30 of the main body 11 (the gantry 23). The blower 12 is fixed to the main body 11 by passing through (see FIG. 3) from below and screwing into the substrate 47. Therefore, the blower 12 can be removed from the main body 11 by loosening the six fixing bolts 48 and separating them from the substrate 47.

  The filter unit 13 is connected to the blower 12 and is detachably disposed with respect to the main body 11 and incorporates a filter capable of removing harmful substances (for example, radioactive substances) from the inhaled air. That is, the filter unit 13 includes a frame 51, a storage box 52, a pre-filter 53, a hepa (HEPA: High Efficiency Particulate Air Filter) filter 54 (see FIG. 5), and a lid 55.

  As shown in FIGS. 5 and 6, the frame 51 includes a front and rear frames 61 and 62 each having a square ring shape connected by four connecting pieces 63 and 64, respectively, and a rear lid 65 and a rear frame 62. It is fixed and configured. In the frame 51, a through hole 66 is formed in the rear lid 65, and the through hole 66 is provided at a position shifted upward by a predetermined distance from the center of the frame 51. In addition, a handle 67 having a U-shape is fixed to the upper portion of the frame 51. The frame 51 is fixed with a pair of left and right hooks 68 that hang down from the lower part of the two rear frames 62. Each hook 68 has an opening 69 facing rearward.

  The storage box 52 has a square box shape, an opening 71 having a rectangular tube shape is formed on one side, and a discharge portion 72 having a cylindrical shape is formed on the other side. It is provided at a position shifted upward from the center of the box 52 by a predetermined distance. The storage box 52 is detachable from the frame 51 from the other side. At this time, the discharge portion 72 passes through the through-hole 66, and the end on the opening portion 71 side is from the front frame 61. Projects to one side.

  At this time, the pre-filter 53 and the hepa filter 54 can be stored in the storage box 52 through the opening 71. A hepa filter 54 is disposed on the back side, and a pre-filter 53 is disposed on the opening 71 side. The pre-filter 53 is arranged upstream of the hepa filter 54 in the air flow direction, and can collect and remove dust contained in the air, so that the effect of the hepa filter 54 is maintained. Is. The hepa filter 54 is disposed downstream of the pre-filter 53 in the air flow direction, and can collect and remove harmful substances such as fine dust and radioactive substances (fine particles) contained in the air. Yes. In this case, the pre-filter 53 and the hepa filter 54 are provided with a frame around them, and each frame is fixed by fitting into the opening 71 of the storage box 52.

  As shown in FIGS. 7 and 8, the lid 55 has a cylindrical suction portion 73 formed on one side and a rectangular tube-shaped opening 74 formed on the other side. The part 74 is connected by a connecting part 75 having a quadrangular pyramid shape. The outer diameter of the opening 71 of the storage box 52 and the inner diameter of the opening 74 of the lid 55 are set to be substantially the same shape and substantially the same size, and the outer surface of the opening 55 of the storage box 52 is placed on the outer surface of the lid 55. By fitting the inner surface of the opening 74, the opening 71 of the storage box 52 can be closed by the lid 55.

  As shown in FIGS. 1 and 5 to 8, a snap lock 76 as a plurality of locking devices is provided between the frame 51 (storage box 52) and the lid 55. That is, the frame 51 is provided with a ring side part 76a on the outer peripheral surface of the front frame 61, and the lid 55 is provided with a hook side part 76b on the outer peripheral surface on the opening 74 side. The snap lock 76 is generally used. For example, the ring-side part 76a has an operation lever that is rotatably provided and a snap ring that is rotatably provided to the operation lever. The hook side part 76b has a hook on which the snap ring is hooked. Accordingly, in a state where the opening portion 74 side of the lid 55 is fitted to the opening portion 71 of the storage box 52, the snap ring is hooked on the hook and the operation lever is rotated, so that the lid 55 is held by the snap lock 76. The lid 55 can be fixed to the frame body 51 with the opening 71 of the 52 closed.

  The filter unit 13 configured as described above is detachable from the main body 11 and the blower 12 as shown in FIG. That is, the filter unit 13 is placed on the pedestal 23 in the main body 11 and moved rearward (rightward in FIG. 1) so that the discharge portion 72 of the storage box 52 is fitted into the suction portion 43 of the blower 12. Can be connected together. At this time, the fastening bolts 77 are respectively screwed into the screw holes 33 (see FIG. 2) on both sides of the main body 11 in advance, and the filter unit 13 is moved rearward so that the hooks 68 are moved. The filter unit 13 can be fixed to the main body 11 by engaging with the fastening bolts 77 and fastening the fastening bolts 77.

  Further, the harmful substance removing apparatus 10 is provided with a differential pressure sensor 81 that measures a pressure difference between the discharge unit 44 of the blower 12 and the suction unit 73 of the filter unit 13. The differential pressure sensor 81 is fixed to the blower 12, and is connected to the discharge portion 44 and the pipe 82, and is connected to the suction portion 73 of the filter unit 13 and the pipe (air path) 83. Accordingly, the differential pressure sensor 81 is supplied with the pressure of the discharge part 44 of the blower 12 and the pressure of the suction part 73 of the filter unit 13 and can output the pressure difference between them (for example, digital display). In this case, the pipe 83 that connects the differential pressure sensor 81 and the suction portion 73 of the filter unit 13 is composed of two divided pipes 83a and 83b, and is detachable (separable) by connectors 83c and 83d.

  Here, the usage method of the harmful substance removal apparatus 10 of the present embodiment configured as described above will be described.

  The harmful substance removal apparatus 10 of this embodiment can clean a room by removing the harmful substance from the air in a predetermined room. That is, by sucking air in a predetermined room and discharging the cleaned air from which harmful substances have been removed to the outside, this room can be brought into a negative pressure state and the room can be maintained in a clean state. In addition, by sucking the outside air of a predetermined room and discharging the cleaned air from which harmful substances have been removed, the room can be brought into a positive pressure state and the room can be maintained in a clean state.

  More specifically, the blower 12 is operated by connecting the power cord 45 to a power supply device (not shown) and turning on a switch (not shown). Then, the blower 12 applies a negative pressure to the filter unit 13 through the suction part 43, and external contaminated air is sucked into the filter unit 13 from the suction part 73. At this time, in the filter unit 13, the pre-filter 53 collects dust and the like contained in the air, and the hepa filter 54 collects harmful substances such as fine dust and radioactive substances (fine particles) contained in the air. Then, the clean air from which harmful substances have been removed passes through the blower 12 and is discharged from the discharge unit 44 to the outside.

  At this time, if the entire apparatus is set up so that the second support piece 24 is positioned downward, the arrangement area of the harmful substance removal apparatus 10 can be reduced, for example, C / V in the nuclear power plant Even in a narrow space such as R / V or a reactor building, the hazardous substance removing apparatus 10 can be easily used. In the harmful substance removal apparatus 10 according to the present embodiment, the anti-slip member 24a is provided on the second support piece 24 of the main body 11. When the harmful substance removal apparatus 10 is erected, the harmful substance on the floor surface is provided. The removal device 10 can be prevented from slipping, and the impact on the harmful substance removal device 10 can be reduced.

  If the pre-filter 53 and the hepa filter 54 are clogged due to long-term use, the measured value of the differential pressure sensor 81 becomes larger than a preset reference value. At this time, the pre-filter 53 and the hepa filter 54 are replaced. In this case, first, the fastening of the filter unit 13 to the main body 11 is released by loosening each fastening bolt 77. Next, the filter unit 13 is moved forward (leftward in FIG. 1) on the gantry 23 so that the hooks 68 of the frame 51 are detached from the fastening bolts 77, and the discharge portion 72 of the storage box 52 is removed. Extract from the suction part 43 of the blower 12. Here, the filter unit 13 can be removed from the main body 11.

  The filter unit 13 removed from the main body 11 releases the snap lock 76 and removes the lid 55 in a predetermined room, removes the storage box 52 from the frame 51, and discards the storage box 52 together with the filters 53 and 54. To do. The frame 51 and the lid 55 are decontaminated and reused. Note that only the filters 53 and 54 may be discarded and the storage box 52 may be reused.

  When disposing of the filters 53 and 54 and the storage box 52, the filters 53 and 54 and the storage box 52 are placed in a disposal bag, the suction part 73 of the filter unit 13 is inserted, and the blower 12 is operated. The air in the waste bag is purified and discharged, and the volume of waste can be reduced.

  In this case, the operation of replacing the clogged prefilter 53 and hepa filter 54 with respect to the harmful substance removing apparatus 10 is performed in a predetermined room so that the collected harmful substances are not scattered, but the filter unit 13 is removed. The main body 11, the blower 12, and the filter unit 13 are transported while being stored in a predetermined storage case.

  As shown in FIG. 9, the storage case 101 includes a case main body 102 that is open at the top, a case lid 103 that can close the opening of the case main body 102, and a lock device 104 that fixes the case lid 103 to the case main body 102. Have. The storage case 101 has a handle 105 on the case lid 103. And this storage case 101 can accommodate the main body 11 and the air blower 12 inside. The storage case 101 is provided with a slip prevention member that prevents the main body 11 and the blower 12 from rattling or slipping when the main body 11 and the blower 12 are housed.

  As shown in FIG. 10, the storage case 111 includes a case main body 112 having an upper opening, a case lid 113 that can close the opening of the case main body 112, and a lock device 114 that fixes the case lid 113 to the case main body 112. And have. The storage case 111 is provided with a handle 115 on a case lid 113. The storage case 111 can accommodate the filter unit 13 therein. The storage case 101 is provided with a slip prevention member that prevents the filter unit 13 from rattling or slipping when the filter unit 13 is accommodated.

  By storing the main body 11, the blower 12, and the filter unit 13 in the predetermined storage cases 101 and 111 in this way, the harmful substances collected when moving on the premises are not scattered and the main body is being transported. 11. The blower 12 and the filter unit 13 are not damaged.

  Although the storage case 111 can accommodate the filter unit 13 therein, only the storage box 52 and the filters 53 and 54 to be discarded are stored, or only the frame 51 and the lid 55 to be reused are stored. May be.

  On the other hand, a new filter unit 13 is prepared for the main body 11 from which the used filter unit 13 has been removed, and the new filter unit 13 is connected to the blower 12 and fixed to the main body 11 to resume the operation. .

  In addition, when removing the used filter unit 13 from the main body 11 or when fixing a new filter unit 13 to the main body 11, the main body 11 was held, and the entire apparatus was erected so that the second support piece 24 was located below. In this state, the loosening and fastening work of the fastening bolt 77 and the moving work of the filter unit 13 relative to the main body 11 can be easily performed, and the workability of the replacement work of the filter unit 13 can be improved. The main body 11 is prevented from slipping because the four anti-slip members 24a are in close contact with the floor.

  By the way, as shown in FIG. 11, the harmful substance removal apparatus 10 of the present embodiment can be fitted with a dust filter 91 capable of collecting dust in the suction portion 73 of the filter unit 13 and connected to the suction hose 92. It is possible. The dust filter 91 is a coarser filter than the pre-filter 53 and is made of, for example, a metal mesh. The dust filter 91 has a hemispherical shape, and an outer peripheral flange 93 can be locked to the outer peripheral portion of the suction portion 73. It has become. The suction hose 92 includes a connection portion 94 that is fitted to the outside of the suction portion 73 (dust filter 91) of the filter unit 13 and a predetermined length made of a flexible material, and a proximal end portion of the connection portion 94. And a suction member 96 having a suction port with a narrowed tip and connected to the tip of the hose 95.

  Therefore, after attaching the dust filter 91 to the suction portion 73 of the filter unit 13 and connecting the suction hose 92 to operate the blower 12, the tip end portion of the suction hose 92 is moved to a position to be cleaned. Then, the dust sucked in through the suction hose 92 is collected by the dust filter 91, and then dust or the like contained in the air is collected by the prefilter 53 in the filter unit 13, and in the air by the hepa filter 54. Harmful substances such as fine dust and radioactive materials (fine particles) are collected. Then, the clean air from which harmful substances have been removed passes through the blower 12 and is discharged from the discharge unit 44 to the outside.

  Thus, in the harmful substance removal apparatus of the present embodiment, the main body 11, the blower 12 disposed in the main body 11, and the suction portion 73 of the blower 12 are connected to the main body 11 and the blower 12. On the other hand, a filter unit 13 is provided, which is detachably disposed and includes filters 53 and 54 that can remove harmful substances from the inhaled air.

  Therefore, the filter unit 13 can be detachably arranged with respect to the main body 11 and the blower 12, so that the filter unit 13 can be reduced in size and weight, and the filters 53 and 54 can be replaced. It is possible to easily perform maintenance work such as this, and the work of replacing the filters 53 and 54 can be facilitated to improve the workability in the maintenance work.

  In the harmful substance removal apparatus of this embodiment, the blower 12 is detachably disposed on the main body 11. Accordingly, the blower 12 can be reduced in size and weight, and when the blower 12 is replaced due to aging, the replacement work can be facilitated and the cost can be reduced. can do. Furthermore, when the filter unit 13 is removed from the main body 11 and the filters 53 and 54 are replaced, the filter unit 13 is separated from the blower 12, so that the blower 12 needs to be brought into a predetermined room together with the filter unit 13. No, contamination of the blower 12 can be prevented.

  In the harmful substance removing apparatus according to the present embodiment, the filter unit 13 is passed through the frame 51, the storage box 52 having the opening 71 and the discharge unit 72 and detachable from the frame 51, and the opening 71. A pre-filter 53 and a hepa filter 54 that can be stored in the storage box 52, and a lid 55 that has a suction portion 73 and can close the opening 71. Therefore, since the filter unit 13 is composed of a plurality of members and the plurality of filters 53 and 54 are accommodated therein, the filters 53 and 54 can be easily replaced.

  In the harmful substance removal apparatus of the present embodiment, a differential pressure sensor 81 that measures a pressure difference between the discharge unit 44 of the blower 12 and the suction unit 73 of the filter unit 13 is provided, and the suction unit 73 of the filter unit 13 and the differential pressure sensor are provided. A pipe 83 that connects the pipe 81 is constituted by two divided pipes 83a and 83b. Therefore, by measuring the pressure difference between the discharge part 44 of the blower 12 and the suction part 73 of the filter unit 13 by the differential pressure sensor 81, the replacement time of the filters 53 and 54 can be properly determined, and harmful substances can be determined. The filter unit 13 can be removed efficiently, and the filter unit 13 can be easily detached from the blower 12 when the filter unit 13 is replaced by configuring the pipe 83 with the two divided pipes 83a and 83b.

  In the harmful substance removal apparatus of this embodiment, a dust filter 91 capable of collecting dust is provided in the suction portion 73 of the filter unit 13 and a suction hose 92 can be connected. Therefore, not only harmful substances in the air, but also trash such as harmful substances scattered in the vicinity can be sucked by the suction hose 92 and removed by the dust filter 91, and can be applied to many applications.

  In the above-described embodiment, the blower 12 is fixed to the main body 11 by a plurality of fixing bolts 48 and can be removed by loosening the fixing bolts 48. However, the present invention is not limited to this configuration. In addition, the filter unit 13 is fixed to the main body 11 with a plurality of fastening bolts 77 and can be removed by loosening the fastening bolts 77. However, the present invention is not limited to this configuration. For example, instead of the fixing bolt 48 and the fastening bolt 77, a snap lock or a locking device may be used.

  In the embodiment described above, the blower 12 and the filter unit 13 are connected horizontally to the main body 11 and can be run by the casters 26. However, the blower 12 and the filter unit 13 are connected vertically to the main body 11. The caster 26 may be allowed to travel.

DESCRIPTION OF SYMBOLS 10 Harmful substance removal apparatus 11 Main body 12 Blower 13 Filter unit 23 Base 24 Second support piece 26 Caster 31 Mounting hole 33 Screw hole 43 Suction part 44 Discharge part 48 Fixing bolt 51 Frame body 52 Storage box 53 Prefilter 54 Hepafilter 55 Cover 68 Hook 71 Opening 72 Discharge Part 73 Suction Part 76 Snap Lock 77 Fastening Bolt 81 Differential Pressure Sensor 83 Piping (Air Path)
91 Dust filter 92 Suction hose 101, 111 Storage case

Claims (4)

The body,
A blower disposed in the main body;
A filter unit that is connected to the suction portion of the blower and is detachably disposed with respect to the main body and the blower and includes a filter that can remove harmful substances from the sucked air; and
I have a,
A differential pressure sensor for measuring a pressure difference between the discharge part of the blower and the suction part of the filter unit is provided, and an air path connecting the suction part of the filter unit and the differential pressure sensor is provided so as to be split;
An apparatus for removing harmful substances.   The harmful substance removing apparatus according to claim 1, wherein the blower is detachably disposed on the main body.   The filter unit includes a frame, a storage box having an opening and a discharge part and detachable from the frame, a prefilter and a hepa filter that can be stored in the storage box through the opening, and a suction unit The harmful substance removing apparatus according to claim 1, further comprising: a lid having a lid and capable of closing the opening. The harmful substance removing device according to any one of claims 1 to 3 , wherein a dust filter capable of collecting dust is provided in the suction portion of the filter unit, and a suction hose is connectable. .

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