JP2010274888A - Air conditioner for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress inconvenience by removal of a filter at low cost. <P>SOLUTION: The air conditioner 1 for the vehicle includes a casing 6 having an air flow passage S in which air-conditioning air flows; the filter 40 arranged on the air flow passage S in the casing 6 and filtering the air-conditioning air; and a damper 20 for opening/closing the air flow passage S. On the casing 6, a support plate part 33 for supporting a peripheral edge part of the filter 40 is provided. On the damper 20, a closure plate part 21 for closing the air flow passage S and a turning shaft 24 for turning the closure plate part 21 are provided. The turning shaft 24 is arranged at an air bottom of the filter 40 supported on the support plate part 33 and is formed so as to support the filter 40 deformed to the air bottom side. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a vehicle air conditioner provided with a filter for filtering air for air conditioning.

  Conventionally, a vehicle air conditioner including a filter for filtering air for air conditioning is known (see, for example, Patent Document 1). The filter of patent document 1 is arrange | positioned in the casing which accommodates a ventilation fan. A support portion that supports the peripheral edge portion of the filter is provided in the casing, and the filter performs air filtration while being supported by the support portion.

JP 2007-145076 A

  By the way, since the filter is generally made of a flexible material such as a non-woven fabric, it can be considered that the filter is deformed so as to be bent toward the leeward side by the wind pressure especially when the amount of air blown is large. Further, the filter may be deformed due to aging or the like. If the filter is deformed, it will come off from the support part of the casing and cause a problem. On the other hand, it is conceivable to provide a filter or casing with a structure that prevents the filter from coming off. However, if such a structure is purposely provided in the filter or casing, the cost increases.

  The present invention has been made in view of such a point, and an object of the present invention is to be able to suppress the removal of the filter by using a rotating shaft of a damper generally provided in an air conditioner. Therefore, it is possible to suppress the removal of the filter at a low cost.

  1st invention accommodates the apparatus for air conditioning, and has a casing which has an air flow path through which air for an air conditioning flows, a filter which is arrange | positioned in the air flow path in the said casing, and filters the air for an air conditioning, The said air flow In the vehicle air conditioner including a damper that opens and closes a path, the casing is provided with a casing-side filter support portion that supports a peripheral portion of the filter, and the damper is configured to close an air flow path. A closing portion and a turning shaft for turning the closing portion are provided, and the turning shaft is disposed on the leeward side of the filter supported by the casing-side filter support portion and deformed toward the leeward side. The filter is formed to support the filter.

  According to this configuration, the filter is supported from the leeward side by the rotating shaft of the damper when the filter receives wind pressure during blowing or undergoes secular change and is deformed to the leeward side.

  According to a second invention, in the first invention, the closing portion of the damper is formed in a plate shape, and side plate portions extending so as to protrude from the closing portion are provided on both sides in the rotational axis direction of the closing portion. The moving shaft is provided on the distal end side of the side plate portion, and the filter is disposed between the closing portion and the rotating shaft.

  According to this configuration, a space is formed between the closing portion of the damper and the rotation shaft. Since the filter is arranged in this space, the space formed in the damper can be used effectively.

  A third invention is characterized in that, in the first or second invention, the rotation shaft of the damper is positioned so as to correspond to the center of the leeward side surface of the filter.

  That is, since the peripheral part of the filter is supported by the casing-side filter support part, the part closer to the center is more easily deformed than the peripheral part. In this configuration, since the rotation shaft of the damper is positioned so as to correspond to the portion near the center of the filter, the center portion or the vicinity of the center portion of the filter can be supported by the rotation shaft.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the filter includes a filter medium that is bent so as to form a continuous waveform, and the rotation shaft of the damper is formed of the filter medium. The waveform extends in a continuous direction.

  That is, when the filter material is corrugated and the filtration area is widened, it is conceivable that the filter material is deformed so that the peaks and valleys constituting the corrugation are greatly bent. This portion can be supported by one rotating shaft, and the amount of deformation can be reduced.

  According to a fifth invention, in any one of the first to fourth inventions, the rotating shaft is provided with a damper-side filter support portion protruding in a radial direction.

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the portion of the rotating shaft that faces the leeward side of the filter is bent in the radial direction.

  According to the fifth and sixth inventions, a wide range of the filter can be supported by the rotating shaft.

  According to the first invention, the rotation shaft of the damper is disposed on the leeward side of the filter, and the filter can be supported by the rotation shaft, so that the damper is not provided with a structure for preventing the filter from being detached. Can be used to suppress the removal of the filter. Thereby, the removal of the filter can be suppressed at a low cost.

  According to the second invention, since the filter is arranged in the space formed between the closed portion of the damper and the rotation shaft, the air conditioner having the filter can be compactly assembled.

  According to the third aspect of the invention, since the rotation shaft of the damper is positioned so as to correspond to the center of the leeward side surface of the filter, it effectively supports the easily deformable portion of the filter to prevent the filter from coming off. It can be prevented beforehand.

  According to the fourth aspect of the invention, the amount of deformation of the filter provided with the corrugated filter medium can be kept small by the single rotating shaft of the damper.

  According to the fifth and sixth aspects, the wide range of the filter can be supported by the rotating shaft of the damper, and the filter can be prevented from coming off.

It is the figure which looked at the air-conditioner for vehicles concerning an embodiment from the vehicles back side. It is the figure which looked at the ventilation unit of the state which removed the cover member from the vehicle rear side. It is the III-III sectional view taken on the line in FIG. It is a disassembled perspective view of the ventilation unit which abbreviate | omitted the fan and the motor. It is the perspective view which looked at the rotary damper from the obstruction board part side. It is the perspective view which looked at the rotary damper from the rotating shaft side. It is sectional drawing corresponded in the VII-VII line in FIG. FIG. 7 is a view corresponding to FIG. 6 according to Modification 1. FIG. 7 is a view corresponding to FIG. 6 according to Modification 2.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 shows a view of a vehicle air conditioner 1 according to Embodiment 1 of the present invention as viewed from the vehicle rear side. The vehicle in which the air conditioner 1 is disposed is a so-called right-hand drive vehicle in which a driver seat and a passenger seat are provided on the right side and the left side of the vehicle, respectively. In the description of this embodiment, for convenience of explanation, the left side in the vehicle width direction is simply referred to as “left”, and the right side in the vehicle width direction is simply referred to as “right”.

  The air conditioner 1 includes a blower unit 3 that blows air for air conditioning, an air conditioner unit 4 that introduces air blown from the blower unit 3 into conditioned air, and a blower unit 3 that blows air to the air conditioner unit 4. And an intermediate duct 5 for sending air for air conditioning.

  The air-conditioning unit 4 is disposed at a substantially central portion in the left-right direction in an instrument panel (not shown) of the passenger compartment, while the air-blowing unit 3 is separated to the left side with respect to the air-conditioning unit 4 and is installed in the passenger seat. It is arranged in the front.

  The blower unit 3 includes a casing 6 that houses a fan 47 (shown in FIG. 3) as an air conditioning device. As shown in FIG. 2, the upper portion of the casing 6 is an air intake portion 7 for taking in air for air conditioning into the blower unit 3, while the lower portion is used for the air conditioning described above. It is set as the ventilation part 8 for ventilating to the unit 4. FIG. Moreover, the part between the air intake part 7 of the casing 6 and the ventilation part 8 is made into the filter accommodating part 30 for accommodating the filter 40 (shown in FIG.3 and FIG.4). The filter 40 is formed in a substantially rectangular thick plate shape, and is disposed such that the air passage surface extends substantially horizontally. In addition, the codes | symbols 19 and 19 of FIG. 1 are the leg parts for fixing the ventilation unit 3 to a vehicle body.

  As shown in FIG. 3, an air flow path S extending from the air intake portion 7 to the blower portion 8 is provided in the casing 6, and the air-conditioning air introduced from the air intake portion 7 passes through the air flow path S. It comes to circulate.

  An air intake 10 for taking in air outside the vehicle compartment is formed on the front side of the vehicle above the air intake portion 7, and an air intake 11 for taking in air inside the vehicle compartment is formed on the rear side of the vehicle. Yes. The outside air intake 10 and the inside air intake 11 constitute the upstream end of the air flow path S. The outside air inlet 10 and the inside air inlet 11 have substantially the same rectangular shape. A duct 12 extending outward from the casing 6 is formed at the peripheral edge of the outside air inlet 10. The front end portion of the duct 12 communicates with the outside through an opening (not shown) formed in a dash panel (not shown) of the vehicle. As shown in FIGS. 1 and 2, the casing 6 is provided with a grid-like grill 14 that covers the inside air inlet 11.

  As shown in FIG. 3, a seal plate 6 a is formed inside the casing 6 at the peripheral edge portions of the outside air inlet 10 and the inside air inlet 11. The seal plate portion 6 a protrudes inward of the casing 6 and extends continuously over the entire circumference of the intake ports 10 and 11.

  A rotary damper 20 is disposed inside the casing 6. The rotary damper 20 is configured to rotate in a direction (front-rear direction) in which the outside air intake 10 and the inside air inlet 11 are arranged to selectively open and close the outside air inlet 10 and the inside air inlet 11. Specifically, as shown in FIGS. 5 and 6, the rotary damper 20 includes a closing plate portion (closing portion) 21, a triangular left side plate portion 22 and a right side connecting to both ends of the closing plate portion 21 in the left-right direction. A plate portion 23 and a pivot shaft 24 extending in the left-right direction so as to connect the left and right side plate portions 22, 23 are provided. The closing plate 21 is for closing either the outside air inlet 10 or the inside air inlet 11 and has a rectangular shape that is long in the left-right direction. The left side plate portion 22 and the right side plate portion 23 extend so as to protrude substantially perpendicular to the closing plate 21. The left side plate portion 22 and the right side plate portion 23 are substantially parallel.

  The rotation shaft 24 extends linearly in parallel with the closing plate portion 21 so as to connect the tip portion of the left plate portion 22 and the tip portion of the right plate portion 23. The left end portion of the rotation shaft 24 protrudes to the left from the left wall portion 22, and the right end portion of the rotation shaft 24 protrudes from the right wall portion 23 to the right side. As shown in FIG. 7, the space | interval of the rotating shaft 24 and the obstruction board 21 is fully ensured so that the space W for arrange | positioning the filter 40 mentioned later may be formed.

  A seal member 25 is disposed at the peripheral edge of the rotary damper 20. The seal member 25 is made of an elastic material such as a foamed resin material. The seal member 25 comes into contact with the seal plate portion 6 a of the casing 6.

  The left end portion of the rotation shaft 24 is rotatably supported by the left wall portion of the casing 6. Further, the right end portion of the rotation shaft 24 is rotatably supported by the right wall portion of the casing 6 and protrudes outward from the casing 6 from the right wall portion.

  An inner / outside air switching motor actuator (not shown) and an inside / outside air switching link mechanism (not shown) for rotating the rotary damper 20 are disposed on the right wall portion of the casing 6. The inside / outside air switching motor actuator is fastened and fixed to a boss (not shown) protruding from the right side wall portion of the casing 6. The inside / outside air switching link mechanism is composed of a driving link to which the output shaft of the inside / outside air switching motor actuator is connected and a driving arm to which the rotary shaft 24 of the rotary damper 20 is connected. Are engaged with each other.

  When the operating force by the inside / outside air switching motor actuator is transmitted to the rotary damper 20 via the drive link and the drive arm, the rotary damper 20 rotates around the rotation shaft 24.

  As shown in FIG. 3, when the rotary damper 20 is rotated forward, the closing plate portion 21 is in a position to close the outside air intake 10 and the inside air inlet 11 is opened. Further, the seal member 25 of the rotary damper 20 abuts on the seal plate portion 6 a around the outside air inlet 10 of the casing 6 and the peripheral edge of the outside air inlet 10 is sealed. Thereby, it becomes an inside air introduction mode in which only the air in the passenger compartment is introduced into the air flow path S of the casing 6.

  On the other hand, when the rotary damper 20 is rotated rearward, the closing plate portion 21 is in a position to close the inside air inlet 11 and the outside air inlet 10 is opened. Further, the seal member 25 of the rotary damper 20 abuts on the seal plate portion 6a around the inside air inlet 11 of the casing 6 so that the peripheral portion of the inside air inlet 11 is sealed. As a result, the air flow path S of the casing 6 is in an outside air introduction mode in which only air outside the passenger compartment is introduced.

  The filter housing part 30 is formed so as to surround the filter 40. As shown in FIGS. 4 and 7, the filter 40 accommodated here surrounds a filter body 41 formed by bending a filter medium so as to form a continuous waveform in a predetermined direction, and a peripheral portion of the filter body 41. And a frame portion 42 formed as described above. The filter main body 41 and the frame part 42 are integrated, and are exchanged together. The filter 40 is set so that the direction in which the waveform of the filter main body 41 continues in the state accommodated in the filter accommodating portion 30 is the left-right direction.

  As shown in FIG. 2, the rear wall portion of the filter housing portion 30 is formed with a desorption hole 31 for detaching the filter 40 when the filter 40 is exchanged. The desorption hole 31 has a rectangular shape that is long in the left-right direction corresponding to the shape of the filter 40. As shown in FIG. 1, a lid member 32 that closes the attachment / detachment hole 31 is attached to the casing 6. The lid member 32 has a rectangular plate shape corresponding to the attachment / detachment hole 31. A claw (not shown) that engages with the peripheral edge of the attachment / detachment hole 31 is formed on the peripheral edge of the lid member 32.

  As shown in FIG. 3, a support plate portion (casing side support portion) 33 that supports the peripheral portion of the filter 40 from the leeward side is formed in the filter housing portion 30. The support plate portion 33 protrudes from the inner surface of the filter housing portion 30 toward the inside of the casing 6 and extends in the circumferential direction. The support plate portion 33 is located above the rotation shaft 24 of the rotary damper 20 and below the closing plate portion 21. Accordingly, as shown in FIG. 7, the filter 40 supported by the support plate portion 33 is positioned between the rotary shaft 24 and the closing plate portion 21 of the rotary damper 20, and the rotary shaft 24 is supported. It is arranged on the leeward side of the filter 40 supported by the plate portion 33. Further, since the direction in which the rotary shaft 24 of the rotary damper 20 extends is the left-right direction, the direction in which the rotary shaft 24 extends and the direction in which the waveform of the filter body 41 continues are substantially the same.

  The rotating shaft 24 is positioned so as to correspond to the front-rear direction center of the leeward side surface (lower surface) of the filter 40, and when viewed along the air flow direction, the center of the filter 40 in the front-rear direction. The rotating shaft 24 extends so as to cross the vicinity of the portion.

  As shown in FIGS. 3 and 7, the leeward surface of the filter 40 is spaced upward from the rotation shaft 24 of the rotary damper 20. The separation dimension h (shown in FIG. 7) between the leeward side surface of the filter 40 and the rotation shaft 24 is such that the filter 40 does not come off the support plate portion 33 even if the filter body 41 is deformed during air blowing described later. It is a grade which can maintain the state supported by the rotating shaft 24, for example, is set to about 5 mm-10 mm.

  Further, the closing plate portion 21 and the seal member 25 of the rotary damper 20 are separated from the upper surface which is the windward surface of the filter 40 in a state where the rotary damper 20 is rotated forward and a state where the rotary damper 20 is rotated rearward. The dimensions of each part and the rotation range of the rotary damper 20 are set. Therefore, the rotary damper 20 rotates without contacting the filter 40.

  Further, as shown in FIG. 3, two protrusions 34 that are in contact with the front end surface of the filter 40 are formed on the inner surface of the front wall portion of the filter housing portion 30 with an interval in the vertical direction. These protrusions 34 extend in the left-right direction.

  A partition wall 45 is formed between the filter housing unit 30 and the blower unit 8. A bell mouth shaped hole 46 is formed in the partition wall 45. The hole 46 constitutes a part of the air flow path S. A centrifugal multiblade fan 47 is disposed below the hole 46 in the blower 8 with its rotation axis directed in the vertical direction. A motor 48 that rotates the fan 47 is attached to the lower wall portion of the blower 8.

  An air outflow path 49 in which the air blown out from the fan 47 gathers is formed around the fan 47 in the blower unit 8. Although not shown, the downstream end of the air outflow passage 49 is open on the right side wall of the blower portion 8, and the left end portion of the intermediate duct 5 is connected to the downstream end opening.

  As shown in FIG. 1, the casing 30 of the air conditioning unit 4 is long in the vertical direction as a whole, and is larger than the casing 6 of the blower unit 3. An inlet 25 is formed in the left side wall of the casing 30, and the right end portion of the intermediate duct 8 is connected to the inlet 25.

  An air flow path R extending upward from the introduction port 25 is provided in the casing 30. In the air flow path R, an evaporator (air conditioning device) 34 as a cooling heat exchanger and a heater core 43 as a heating heat exchanger are arranged. The conditioned air is generated by mixing the air that has passed through the evaporator 34 and the air that has passed through the heater core 43. The casing 30 is formed with a face air outlet 66, a foot air outlet (not shown), and a defroster air outlet (not shown). These outlets are opened and closed by an outlet direction switching damper (not shown) disposed in the casing 30.

  Next, the operation of the air conditioner 1 configured as described above will be described. As shown in FIG. 3, when the fan 47 rotates in a state where the rotary damper 20 of the blower unit 3 is rotated forward to be in the inside air intake mode, the air in the vehicle interior is passed from the inside air inlet 11 to the air flow path. Flows into S. The air flowing into the air flow path S passes through the filter 40 and is filtered. At this time, if the amount of blown air is large, the filter 40 receives a large downward force due to the wind pressure, and the flexible filter main body 41 may be deformed so as to bend downward as indicated by a virtual line in FIG. Since the rotary shaft 24 of the rotary damper 20 is located below the filter body 41, the filter body 41 deformed downward is in contact with the rotary shaft 24 and supported by the rotary shaft 24. Thereby, the deformation amount of the filter main body 41 is suppressed to be small, and the filter 40 is prevented from being detached from the support plate portion 33. This also prevents the filter 40 from being caught in the fan 47.

  The air filtered by the filter 40 passes through the air outflow passage 49, flows through the intermediate duct 5, flows into the air flow path R of the air conditioning unit 30, is temperature-adjusted, and is then supplied to the vehicle interior from each outlet. .

  Further, when the air conditioner 1 is used for a long time, the filter body 41 may be deformed so as to bend downward. Also in this case, since the filter main body 41 is supported by the rotating shaft 24 of the rotary damper 20, the filter 40 is prevented from being detached from the support plate portion 33.

  As described above, according to the air conditioner 1 according to this embodiment, when the rotary shaft 24 of the rotary damper 20 is disposed on the leeward side of the filter 40 and the filter body 41 is deformed to the leeward side, Since the filter body 41 can be supported by the moving shaft 24, the rotating shaft 24 of the rotary damper 20 for switching the inside / outside air is used without providing the filter 40 or the casing 6 with a structure for preventing the filter 40 from coming off. Thus, the removal of the filter 40 can be suppressed at a low cost.

  Further, since the filter 40 is disposed in the space formed between the closing plate portion 21 of the rotary damper 20 and the rotating shaft 24, the air conditioner 1 having the filter 40 can be compactly assembled.

  In addition, since the rotary shaft 24 of the rotary damper 20 is positioned so as to correspond to the center of the leeward side surface of the filter 40, the filter 40 is effectively supported by the easily deformable portion of the filter 40 so that the filter 40 can be removed. It can be prevented beforehand.

  Moreover, since the filter 40 includes the filter main body 41 that is bent so as to form a continuous waveform, a wide filtration area can be secured. When the filter body 41 is bent and formed in this way, it can be considered that the peaks and valleys of the filter body 41 are easily deformed so as to be greatly bent as indicated by phantom lines in FIG. In this case, since the rotary shaft 24 of the rotary damper 20 is arranged so as to extend in the direction in which the waveform of the filter body 41 continues, the single rotary shaft 24 supports the easily deformable portion of the filter body 41. The amount of deformation of the filter body 41 can be kept small.

  In the above-described embodiment, the rotary shaft 24 of the rotary damper 20 is formed in a linear shape. However, the present invention is not limited to this, and for example, as in Modification 1 shown in FIG. Bending portions 24a and 24a bent in the radial direction may be provided in a portion facing the leeward side. In the first modification, since the wide range of the filter 40 is supported by the bent portion 24a, it is possible to prevent the filter 40 from being detached from the support plate portion 33 in advance. The bent portions 24a and 24a protrude in the radial direction of the rotating shaft 24. The protruding direction is such that the bent portions 24a and 24a are in the filter 40 regardless of the rotation position of the rotary damper 20. It is set not to touch the lower surface of the. The number of the bent portions 24a may be one. The bent portion 24a is shaped so as not to contact the filter 40 when the rotary damper 20 rotates.

  Further, as in the second modification shown in FIG. 9, a plurality of plate portions (damper side filter support portions) 24 b and 24 b protruding in the radial direction are spaced apart in the axial direction on the rotating shaft 24 of the rotary damper 20. You may make it provide. These plate portions 24 b and 24 b protrude in the radial direction of the rotation shaft 24. The protruding directions of the plate portions 24 b and 24 b are set so that the plate portions 24 b and 24 b do not come into contact with the lower surface of the filter 40 regardless of the rotation position of the rotary damper 20. Also in the second modification, as in the first modification, the wide range of the filter 40 can be supported, so that the filter 40 can be prevented from being detached from the support plate portion 33 in advance. The number of plate portions 24b may be one. Further, a plate portion 24b as in Modification 1 may be provided on the rotating shaft 24 of Modification 2.

  Moreover, although the said embodiment demonstrated the case where this invention was applied to the semicenter type in which the air conditioner 1 is divided | segmented into the ventilation unit 3 and the air conditioning unit 4, it is not restricted to this, For example, the ventilation fan 47, The present invention can also be applied to a full center type in which the evaporator 34 and the heater core 43 are accommodated in one casing.

  Moreover, although the said embodiment demonstrated the case where the air passage surface of the filter 40 was substantially horizontal, it is not restricted to this, For example, the case where the air passage surface of the filter 40 is substantially vertical, or the case where it inclines. The present invention can also be applied to.

  The structure of the filter 40 may be a structure in which the frame portion 42 is omitted. The filter 40 may be divided into a plurality of parts.

  As described above, the present invention can be applied to a vehicle air conditioner provided with a filter.

DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 6 Casing 20 Rotary damper 21 Closure board part (closure part)
22 Left side plate part 23 Right side plate part 24 Rotating shaft 24a Bending part 24b Plate part (damper side filter support part)
33 Support plate part (casing side filter support part)
40 Filter 41 Filter body (filter material)
47 Fan (air conditioning equipment)
S Air flow path

Claims (6)

A casing having an air flow path through which air-conditioning air flows while accommodating air-conditioning equipment;
A filter that is arranged in the air flow path in the casing and filters air for air conditioning;
In a vehicle air conditioner comprising a damper for opening and closing the air flow path,
The casing is provided with a casing-side filter support that supports the peripheral edge of the filter,
The damper is provided with a closing portion for closing the air flow path, and a rotation shaft for rotating the closing portion,
The vehicle air conditioner is characterized in that the rotating shaft is disposed on the leeward side of the filter supported by the casing-side filter support portion and is configured to support the filter deformed to the leeward side. In the vehicle air conditioner according to claim 1,
The closing portion of the damper is formed in a plate shape, side plate portions extending so as to protrude from the closing portion are provided on both sides of the closing portion in the rotation axis direction, and the rotation shaft is provided on the distal end side of the side plate portion. ,
The vehicle air conditioner, wherein the filter is disposed between the closing portion and the rotation shaft. The vehicle air conditioner according to claim 1 or 2,
The vehicular air conditioner is characterized in that the rotation shaft of the damper is positioned so as to correspond to the center of the leeward side surface of the filter. In the vehicle air conditioner according to any one of claims 1 to 3,
The filter includes a filter medium that is bent to form a continuous waveform.
The vehicular air conditioner characterized in that the rotation shaft of the damper extends in a direction in which the waveform of the filtering material continues. In the vehicle air conditioner according to any one of claims 1 to 4,
A vehicular air conditioner characterized in that a damper-side filter support portion protruding in a radial direction is provided on the rotating shaft. In the vehicle air conditioner according to any one of claims 1 to 5,
The vehicle air conditioner characterized in that a portion of the rotating shaft facing the leeward side of the filter is bent in the radial direction.

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