JP2011183281A - Attachment mechanism of air filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a bolt from tilting and a fixture from unexpectedly falling, upon attaching the fixture to the bolt. <P>SOLUTION: A bolt receiver 30 is fixed to the internal circumferential face 11A of a casing 11. The bolt receiver 30 includes a fixing piece 31 to which a bolt 40 is fixed, and a regulating piece 33 that is disposed to face the front face of the fixing piece 31 and comprises a through-hole 33H for the shaft 41 of the bolt 40 to pass therethrough. Further, a fixture 20 is attached to the shaft 41 of the bolt 40. The fixture 20 includes a pressing piece 21 that allows the shaft 41 to pass therethrough and presses down a filter frame 13, an opposing piece 23 that allows the shaft 41 to pass therethrough and is disposed to face the back of the pressing piece 21, and a connecting piece 22 that connects the opposing piece 23 and the pressing piece 21. The opposing piece 23 is disposed between the regulating piece 33 and the fixing piece 31, and the pressing piece 21 is disposed to face the front face of the regulating piece 33. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an air filter mounting mechanism for mounting an air filter unit inside a casing provided on a ceiling or the like.

  Conventionally, in order to mount an air filter unit inside a casing provided on a ceiling surface, etc., it is composed of a bolt receiving portion provided on the casing side, a bolt fixed to the bolt receiving portion, and a fixing bracket attached to the bolt A mounting mechanism is used. The fixing bracket in this type of mounting mechanism presses the front surface of the filter frame to fix the filter unit to the casing.

  For example, the fixing bracket presses the front surface of the air filter frame on one end side, and a pressing piece whose other end side is disposed outside the outer peripheral surface of the filter frame, and a facing piece provided to face the other end side of the pressing piece, The connecting piece for connecting the opposing piece and the pressing piece is configured integrally (see Patent Document 1). In this fixing bracket, bolt holes are formed at positions where the other end side of the pressing piece and the opposing piece coincide with each other. Then, after the bolt hole of the holding piece and the opposing piece is passed through the bolt fixed to the bolt receiving portion, the nut is further screwed into the bolt, and the holding piece presses the filter frame by the tightening force of the nut. become.

JP 2009-95811 A

  However, when the nut is tightened for fixing the filter, as the tightening proceeds, the other end side of the pressing piece floats upward (back side), and at the same time, the lower end side of the bolt may be inclined outward. When the bolt is tilted, the holding force by the fixing bracket cannot be sufficiently increased, and the lower end portion of the bolt may approach the inner peripheral surface of the casing, for example, and the nut may not be sufficiently tightened. In the configuration of Patent Document 1, since the connection piece is provided on the fixing bracket, the inclination of the bolt is reduced to some extent, but is not sufficiently suppressed.

  In addition, when attaching or removing the filter, if the nut is not screwed below the fixing bracket, there is no member for supporting the fixing bracket, and the fixing bracket may be unexpectedly dropped.

  The present invention has been made in view of the above problems, and it is an object of the present invention to suppress bolt inclination at the time of attaching a filter, and to prevent the fixture from dropping unexpectedly at the time of attaching or removing the filter. And

  An air filter mounting mechanism according to the present invention is an air filter mounting mechanism for mounting an air filter unit inside a casing that is open on the front side, and is fixed to a rod-like member extending in the front-rear direction and an inner peripheral surface of the casing. In addition, a holding member for attaching the rod-like member and a fixture attached to the rod-like member for attaching the air filter unit inside the casing are provided.

  In the present invention, the holding member is provided with a fixing piece having a through hole, and a regulating piece having a through hole that is provided to face the front side of the fixing piece and that corresponds to the through hole of the fixing piece, A first connecting piece for connecting the fixed piece and the restricting piece; the rod-shaped member is fixed to the fixed piece through the through hole of the fixed piece and the restricting piece; It is provided with the pressing piece which is arrange | positioned and presses an air filter unit from the front side.

  The fixture further includes a facing piece provided to face the rear side of the pressing piece, and a second connection piece that connects the facing piece and the pressing piece, and each of the pressing piece and the facing piece has a position corresponding to each other. It is preferable to have a through hole through which the rod-shaped member is passed. In this case, the opposing piece is disposed between the restriction piece and the fixed piece.

  For example, one end side in the first direction presses the front surface of the filter unit, and the other end side of the pressing piece is disposed outside the outer peripheral surface of the filter unit. For example, the second connection piece is disposed outside the outer peripheral surface, and faces the first connection piece while sandwiching the rod-shaped member in the second direction orthogonal to the first direction.

  The first connection piece of the holding member is disposed substantially perpendicular to the inner peripheral surface of the casing, for example. Moreover, the holding member may be provided along the inner peripheral surface of the casing and may include an attachment piece fixed to the inner peripheral surface. The attachment piece is connected to the first connection piece substantially vertically. When each of the fixed piece and the restricting piece has an end face facing the inner peripheral surface of the casing, the distance between the end face and the through hole in the fixed piece is preferably longer than the distance between the end face and the through hole in the restricting piece. . The through holes of the fixed piece and the restricting piece are, for example, round holes or notches.

  For example, when the rod-shaped member is a shaft portion of a bolt, the bolt has a head portion arranged on the rear side of the fixed piece, and is fixed to the fixed piece by a first nut screwed to the front side of the fixed piece. The Further, the shaft portion is passed through a through hole provided in the holding piece, and a second nut is screwed to the front side of the holding piece of the bolt, and the holding piece is pressed by the pressing force by the second nut. The air filter unit may be pressed from the front side.

  In the present invention, since the rod-like member such as a bolt to which the fixture is attached is disposed through the through hole of the restriction piece and the fixture piece, the inclination of the rod-like member when the fixture is attached is suppressed. In addition, since the opposing piece provided on the fixture is disposed between the regulating piece and the fixed piece, the fixture can be prevented from unexpectedly dropping when the filter is attached or removed.

It is a perspective view of an air filter device. It is a side view which shows the outline of an air filter attachment mechanism. It is a perspective view which shows a fixing tool. In 1st Embodiment, it is a perspective view which shows the bolt receiving part attached to the casing. It is a top view which shows the bolt receiving part which concerns on 1st Embodiment. It is a perspective view which shows the air filter attachment mechanism which concerns on 1st Embodiment. It is a front view which shows the air filter attachment mechanism which concerns on 1st Embodiment. It is a perspective view which shows the volt | bolt receiving part which concerns on 2nd Embodiment, the volt | bolt before attaching to a volt | bolt receiving part, and a fixing tool. It is a top view which shows the bolt receiving part which concerns on 2nd Embodiment.

  Hereinafter, an air filter mounting structure according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an air filter device. The air filter device 10 includes a casing 11 and an air filter unit 27. The air filter unit 27 includes a filter frame 13 opened in the front-rear direction (vertical direction), a filter medium 14 accommodated in the filter frame 13, and face guards 15 and 15 for protecting the filter medium 14. . The casing 11 is formed in a rectangular box shape having an open bottom side (front side).

  The filter frame 13 is provided in opposition to the first and second frame plates 13A and 13B, and the third and third frame plates 13 are provided to face each other and connect the end portions of the first and second frame plates 13A and 13B. The four frame plates 13C and 13D are formed in a square frame shape. The filter medium 14 is formed in a substantially rectangular parallelepiped shape in which a flat filter medium sheet is folded in a zigzag shape, and its outer peripheral surface is bonded to the inner peripheral surface of the filter frame 13 and is mounted inside the filter frame 13. The face guards 15 and 15 are formed by punching a number of punching holes in a metal plate. The face guards 15 and 15 are disposed on the lower surface and the upper surface of the filter medium 14 inside the filter frame 13 to protect the filter medium 14.

  The air filter unit 27 is accommodated in the casing 11 through the opening 11 </ b> C on the front side of the casing 11. The air filter unit 27 is attached to the inside of the casing 11 by pressing the front surface 16 side of the filter frame 13 by the fixture 20. In the present embodiment, four fixtures 20 are provided so as to abut on the front surfaces (lower surfaces) of the first to fourth frame plates 13A to 13D of the filter frame 13, respectively. What is necessary is just to be provided so that it may contact | abut at least the front surface of two opposing frame plates among the frame plates 13A-13D. In addition, four or more fixtures 20 may be provided.

  As shown in FIG. 2, the bottom surface 11 </ b> D of the casing 11 is provided with a rectangular frame-shaped filter mounting frame 19 disposed on the back surface (upper surface) 17 of the filter frame 13. Between the back surface 17 of the filter frame 13 and the filter frame mounting frame 19, a gasket 18 provided over the entire circumference of the filter frame 13 is disposed, and the filter frame 13 is connected to the filter mounting frame 19 via the gasket 18. .

  The fixing tool 20 presses the filter frame 13 from the front surface 16 side, sandwiches the filter frame 13 together with the filter mounting frame (attachment portion) 19, and attaches the filter frame 13 to the casing 11. The gasket 18 is clamped from above and below by the filter mounting frame 19 and the filter frame 13, whereby the back surface 17 of the filter frame 13 is connected to the filter mounting frame 19 (that is, the bottom surface 11A of the casing 11) in an airtight manner.

  In addition to the fixture 20, the filter attachment mechanism according to the present embodiment includes a bolt 40 for attaching the fixture 20 and a bolt receiving portion (holding member) 30 for fixing the bolt 40 to the casing 11 side. Further prepare.

  The bolt receiving portion 30 is disposed inside the casing 11 and in a gap between the inner peripheral surface 11A of the casing 11 and the outer peripheral surface 13A of the filter frame 13. Note that the inner peripheral surface 11A and the outer peripheral surface 13A are substantially parallel to each other. A plurality of bolt receiving portions 30 are provided corresponding to the respective fixtures 20, and are respectively fixed to the inner peripheral surface 11 </ b> A of the casing 11. The shaft portion 41 of the bolt 40 is threaded on the outer periphery and extends parallel to the front-rear direction (that is, the vertical direction) of the casing 11. The shaft portion 41 is passed through two bolt holes (through holes) 31H and 33H formed in the bolt receiving portion 30 and is fixed to the bolt receiving portion 30 by a nut 43.

  The fixture 20 has two bolt holes (through holes) 21H and 23H, and the shaft portion 41 of the bolt 40 is passed through the bolt holes 21H and 23H, and is attached to the bolt 40. In the shaft portion 41, a spring washer 46 is inserted on the front side of the fixture 20, and a nut 44 is screwed on the front side thereof. The fixture 20 is pressed rearward (upward) via a spring washer 46 by a nut 44 that is screwed into and tightened to the bolt 40. The fixture 20 presses the filter frame 13 against the back side by the pressing force of the nut 44.

  Next, the fixture according to this embodiment will be described in more detail with reference to FIG. The fixture 20 includes a pressing piece 21, a facing piece 23 provided to face the holding piece 21, and a connecting piece 22 that connects them. The pressing piece 21 is formed in an elongated, substantially rectangular plate shape, and one end 21A in the longitudinal direction is formed in an arc shape when viewed from above, and the other end 21B has a shape in which both sides are chamfered. The holding piece 21 is provided with a bolt hole 21H at the other end 21B from the center position C in the longitudinal direction.

  First and second ribs 24 and 25 are connected to both end portions in the width direction of the pressing piece 21, that is, both end portions 21C and 21D, perpendicular to one surface 21X of the pressing piece 21. The first and second ribs 24 and 25 have a shape in which both side end portions 21C and 21D of the pressing piece 21 are bent. The pressing piece 21 presses the filter frame through the ribs 24 and 25.

  The connection piece 22 extends upward from the front end surface (that is, the side end portion 21C) of the first rib 24 in an elongated, substantially rectangular shape, and is flush with the first rib 24. It is the plate-shaped member arrange | positioned in. That is, the connecting piece 22 exhibits a shape bent from the holding piece 21 together with the first rib 24. In the longitudinal direction of the pressing piece 21, the length of the connecting piece 22 is shorter than the pressing piece 21, and the connecting piece 22 is arranged on the other end 21 </ b> B side from the center position C. Therefore, in the longitudinal direction of the pressing piece 21, the connecting piece 22 is disposed at a position that coincides with the through hole 21H.

  A plate-like facing piece 23 is vertically connected to the tip of the connection piece 22 (one end in the longitudinal direction of the connection piece 22). The facing piece 23 has a shape in which the tip of the connecting piece 22 is bent, and faces the portion on the other end 21 </ b> B side from the center position C of the pressing piece 21. Thereby, the holding piece 21, the connecting piece 22, and the opposing piece 23 are united and exhibit a U-shaped cross section. Bolt holes 23H are formed in the facing piece 23, and the bolt holes 21H and 23H are arranged at positions that coincide with each other.

  Next, the structure of the bolt receiving portion will be described in detail with reference to FIGS. In the following description, the inner peripheral surface 11A of the casing 11 and the direction perpendicular to the up and down direction are the X direction, the up and down direction (for example, the vertical direction) is the Y direction, and the X and Y directions are perpendicular to each other. For convenience, the direction parallel to the inner peripheral surface 11A will be described as the Z direction.

  The bolt receiving portion 30 is integrally formed in a U-shape by a fixing piece 31 and a regulating piece 33 that face each other, and a connecting piece 32 that connects the fixing piece 31 and the regulating piece 33, and is further integrated with the connecting piece 32. It is attached to the casing 11 by a mounting piece 34 that is continuously provided.

  The connection piece 32 is formed in a substantially rectangular plate shape, and each of the plate-like fixing piece 31 and the regulation piece 33 is vertically connected to the one surface 32X side of the connection piece 32 at both ends in the longitudinal direction. The In addition, a plate-like attachment piece 34 is vertically provided on the opposite surface 32 </ b> Y side of the connection piece 32 at one end 32 </ b> A of both ends 32 </ b> A and 32 </ b> B in the width direction of the connection piece 32. That is, the connection piece 32 has a shape in which both ends in the longitudinal direction are bent toward the one surface 32X, and the fixing piece 31 and the restriction piece 33 are provided. Further, the attachment piece 34 is provided in such a manner that one end 32A in the width direction is bent to the opposite surface 32Y side.

  The fixed piece 31 and the restricting piece 33 are substantially parallel to each other, and bolt holes 31H and 33H are formed at positions corresponding to each other. The fixed piece 31 and the restricting piece 33 are substantially square or rectangular, and one side end face 31B, 33B (end face in the X direction) faces the inner peripheral face 11A of the casing 11 and the other side end face 31C. , 33C faces the outer peripheral surface 13A of the filter frame 13 (see FIG. 2).

  The attachment piece 34 is a substantially rectangular plate-like member whose length in the longitudinal direction is substantially the same as that of the connection piece 32, and has two holes 34H and 34H. The mounting piece 34 is disposed along the inner peripheral surface 11A of the casing 11 and is fixed to the casing 11 by rivets (not shown) passed through the holes 34H and 34H. Thereby, the connection piece 32 is arrange | positioned substantially Z direction, ie, substantially perpendicular | vertical to 11 A of internal peripheral surfaces, the width direction is arrange | positioned along a X direction, and a longitudinal direction is arrange | positioned along a Y direction. Further, the fixed piece 31 and the restricting piece 33 are disposed substantially perpendicular to the Y direction.

  As is apparent from FIGS. 3 to 5, the bolt holes 21 </ b> H, 23 </ b> H, 31 </ b> H, and 33 </ b> H are round holes with the entire periphery of the hole closed, and the diameter thereof is slightly larger than the outer diameter of the shaft portion 41 of the bolt 40. Moreover, although the fixing tool 20 and the bolt receiving part 30 are metal fittings formed by bending one metal plate, the fixing tool 20 and the bolt receiving part 30 may be manufactured by a method other than the bending process.

  In addition, in the fixed piece 31 and the regulating piece 33, the connecting portion between the tip end face 31A (33A) and the side end faces 31B and 31C (33B and 33C) is chamfered. Here, in the regulating piece 33, the connecting portion between the tip end surface 33A and one side end surface 33B (the side end surface on the one end 32A side) is chamfered by a circular arc surface 33E concentric with the bolt hole 33H. The portion is chamfered by planes 31D and 33D.

  Next, a configuration in which the bolt 40 and the fixture 20 are attached to the bolt receiving portion 30 will be described in detail with reference to FIGS. In this embodiment, the bolt 40 is attached to the bolt receiving part 30 attached to the casing 11, and the fixture 20 is attached to the bolt 40 together with the bolt 40, and the filter frame is fixed to the casing 11.

  Specifically, the fixture 20 is arranged so that the opposing piece 23 is placed between the fixed piece 31 and the regulating piece 33. That is, from the front side (lower side), the pressing piece 21, the regulating piece 33, the opposing piece 23, and the fixed piece 31 are arranged in this order. The nut 43 is screwed into the shaft 41 of the bolt 40 from the front side of the fixing piece 31 while the shaft 41 of the bolt 40 is passed through the bolt holes 21H, 33H, 23H, 31H arranged at substantially the same positions. Is done. The head portion 42 of the bolt 40 is disposed on the back surface of the fixed piece 31, the fixed piece 31 is sandwiched between the head portion 42 and the nut 43, and the bolt 40 is fixed to the fixed piece 31, that is, the bolt receiving portion 30.

  Next, the spring washer 46 is inserted into the shaft portion 41 of the bolt 40 from the front side of the pressing piece 21, and the nut 44 is screwed. By tightening the nut 44, the fixing tool 20, that is, the pressing piece 21 is pressed toward the rear side via the spring washer 46. The pressing piece 21 pressed in this way presses the filter frame 16 and fixes the air filter unit in the casing.

  At this time, the opposing piece 23 and the pressing piece 21 are arranged substantially perpendicular to the Y direction, become substantially parallel to the fixed piece 31 and the regulating piece 33, and the longitudinal direction of the holding piece 21 is along the X direction. Arranged. The pressing piece 21 has one end 21 </ b> A side in the longitudinal direction pressing the front surface 16 of the filter frame 13, and the other end 21 </ b> B side disposed outside the outer peripheral surface of the filter frame 13.

  The connection piece 22 is disposed substantially perpendicular to the Z direction outside the outer peripheral surface of the filter frame, and faces the connection piece 32 of the bolt receiving portion 30 with the shaft portion 41 of the bolt 40 interposed therebetween in the Z direction. To do. Then, the distal end surface 33 </ b> A of the regulating piece 33 is opposed to the inner peripheral surface of the connection piece 22.

  In the present embodiment, the shaft portion 41 of the bolt 40 is passed through the bolt hole 33H of the restricting piece 33 in addition to the bolt hole 31H of the fixing piece 31 of the bolt receiving portion 30. Therefore, when the bolt 40 is inclined to the outside with respect to the outer peripheral surface 13A of the filter frame 13 with the fixing piece 31 as a fulcrum when the nut 44 is tightened, the shaft portion 41 of the bolt 40 is located at the inner peripheral edge of the bolt holes 31H and 33H. It is locked, and thereby the inclination of the bolt 40 is suppressed.

  Further, since the bolt 40 is fixed to the bolt receiving portion 30 by the nut 43, it can be easily detached from the bolt receiving portion 30. Therefore, for example, it is possible to replace the bolt 40 according to the type of filter. Further, by removing the bolt 40, for example, when the bolt receiving portion is painted, it is not necessary to mask the bolt 40 to prevent clogging of the paint into the bolt groove. Further, since it is not necessary to fix the bolt to the bolt receiving part by welding or the like, the bolt can be easily attached to the bolt receiving part.

  Further, the opposing piece 23 of the fixing tool 20 is passed through the shaft portion 41 above (backward) the restriction piece 33. For this reason, even when the fixing tool 20 freely falls in a state where the nut 44 is not screwed to the shaft portion 41 of the bolt 40, the opposing piece 23 of the fixing tool 20 is caught by the restriction piece 33, and the fixing tool 20 is connected to the bolt 40. Unintentional withdrawal is prevented. That is, in this embodiment, the fixing tool 20 does not unexpectedly come off from the bolt 40 and drop when the filter is attached or detached.

  In addition, in a state where the nut 44 is not tightened, the fixture 20 can rotate around the shaft portion 41. Such rotation is possible only within a predetermined angle range when the connecting piece 22 is locked to the restricting piece 33.

  Specifically, when the fixture 20 is rotated counterclockwise from the state shown in FIGS. 6 and 7 (the longitudinal direction of the pressing piece 21 is parallel to the X direction), the distal end surface 33A of the regulating piece 33 is used. Is locked to the inner peripheral surface of the connection piece 22, and the counterclockwise rotation of the fixture 20 is restricted (the state of the one-dot chain line in FIG. 5). In addition, when the fixture 20 is rotated about 90 ° clockwise from the state of FIGS. 6 and 7, the side end surface 33 </ b> B of the restriction piece 33 is locked to the inner peripheral surface of the connection piece 22, and the clockwise rotation is prevented. It is regulated (state of two-dot chain line in FIG. 5).

  In the present embodiment, when the fixture 20 is rotated clockwise from the state of FIGS. 6 and 7, the fixture 20 does not disturb the insertion / extraction of the air filter unit into the casing 11. Therefore, it is possible to attach and remove the air filter unit without removing the fixture 20 from the bolt 40.

  In the X direction, the distance between the side end surface 33B of the regulating piece 33 and the bolt hole 33H is shorter than the distance between the side end surface 31B of the fixed piece 31 and the bolt hole 31H. Therefore, a relatively large gap is provided between the inner peripheral surface 11 </ b> A of the casing 11 and the restriction piece 33. Further, as described above, the connection portion between the side end surface 33B and the front end surface 33A facing the inner peripheral surface 11A is the arc surface 33E along the rotation track of the fixture 20. Therefore, it becomes easy to rotate the fixing tool 20 clockwise from the state of FIGS.

  On the other hand, in the fixing piece 31, since the distance between the bolt hole 31H and the side end face 31B is relatively long, the area of the fixing piece 31 with which the bolt head 42 and the nut 43 contact can be increased, and the bolt 40 It becomes easy to fix to the fixing piece 31 stably. In the X direction, the distance between the bolt hole 31H of the fixed piece 31 and the side end face 31C is substantially equal to the distance between the bolt hole 33H of the restricting piece 33 and the side end face 33C.

  8 and 9 show a filter mounting mechanism according to the second embodiment of the present invention. In the first embodiment, the bolt hole provided in the bolt receiving portion 30 is a round hole, but in the present embodiment, it is a notch. Hereinafter, the difference between the second embodiment and the first embodiment will be described.

  In the present embodiment, notches 61 and 63 are formed in the fixed piece 31 and the restricting piece 33 from the front end surfaces 31A and 33A side. That is, the fixed piece 31 includes a base 61X that is provided perpendicularly to the connection piece 32, and two tongue portions 61Y and 61Z that extend in the Z direction from the base 61X, and between these tongue portions 61Y and 61Z. A notch 61 is arranged. The notch 61 includes a bottom portion 61A having a semi-circular symmetry axis parallel to the Z direction, and tongue portions 61X and 61Z. The notch 61 extends from both ends of the bottom portion 61A toward the distal end surface 31A along the Z direction. It is comprised by the side parts 61B and 61C to take out.

  On the other hand, similarly to the notch 61, the notch 63 of the restricting piece 33 has a bottom part 63A having a semicircle whose axis of symmetry is parallel to the Z direction, and a side part 63C extending from one end of the bottom part 63A in the Z direction. Although provided, the side portion extending from the other end of the bottom 63A is not provided. That is, the restricting piece 33 is provided with a base 63X that is provided perpendicularly to the connecting piece 32, and tongues 63Y and 63Z that extend from the base 63X in the Z direction. It becomes shorter than the part 63Z. In addition, one tongue part 63Y with short length is arrange | positioned at the end 32A side, and comprises the side end surface 33B which opposes 11 A of internal peripheral surfaces. The other tongue portion 63Z is disposed on the other end 32B side and constitutes a side end surface 33C that faces the outer peripheral surface 13A (see FIG. 2). The diameters of the bottom portions 61A and 63A are slightly larger than the outer diameter of the bolt 40, and the bolt 40 is disposed along the inner peripheral edge of the bottom portions 61A and 63A.

  Also in the present embodiment, as in the first embodiment, the inclination of the bolt 40 is suppressed by the fixing piece 31 (tongue portion 61Z) and the restriction piece 33 (tongue portion 63Y), and fixed by the restriction piece 33. The tool 20 is prevented from falling down unexpectedly. Further, the inner peripheral surface of the connecting piece 22 is locked to the side end surface 33B of the restricting piece 33 or the distal end portion of the tongue 63Z (that is, the distal end surface 33A of the restricting piece 33). The rotation around the portion 41 is restricted as in the first embodiment.

  As in the first embodiment, the distance between the side end face 33B and the bolt hole (notch 63) is shorter than the distance between the side end face 31B and the notch 61 in the X direction. That is, in the restricting piece 33, the width and length of the tongue portion 63Y are both shorter than the width and length of the tongue portion 61Y of the fixed piece 31. On the other hand, the width and length of the tongue 63 </ b> Z are substantially the same as the tongue 61 </ b> Z of the fixed piece 31.

  Thus, by shortening the length and width of the tongue portion 63Y, the clockwise rotation of the fixture 20 is not inhibited by the tongue portion 63Y, and by reducing the length of the tongue portion 63Y, the tongue portion It is possible to prevent the 63Y from being damaged during use. On the other hand, in the fixed piece 31, the width and length of the tongue portion 61 </ b> Y are both large, and the contact area between the fixed piece 31, the bolt head 42 and the nut 43 is large. Therefore, the bolt 40 can be stably fixed to the fixing piece 31.

  Furthermore, in the first embodiment, the bolt 40 needs to be passed through the bolt hole from the upper surface side of the fixed piece 31. However, in this embodiment, the bolt hole is a notch, and thus the bolt 40 is on the front end surface. It can be inserted into the bolt holes from the 31A and 33A sides. Therefore, as shown in FIG. 8, the bolt 40 is moved from the tip end face 31 </ b> A, 33 </ b> A side by moving the bolt 40 in the Z direction with the nut 43 screwed into the bolt 40 and passing the fixture 20. It can be inserted into a notch (bolt hole). Thereby, compared with 1st Embodiment, it becomes easy to attach a volt | bolt and a fixing tool to a volt | bolt receiving part.

DESCRIPTION OF SYMBOLS 10 Air filter apparatus 11 Casing 13 Filter frame 14 Filter medium 20 Fixing tool 21 Holding piece 22 Connection piece (2nd connection piece)
23 Opposing piece 27 Air filter unit 30 Bolt receiving portion 31 Fixed piece 32 Connecting piece (first connecting piece)
33 Restriction piece 40 Bolt 41 Shaft (bar-shaped member)
42 Head 43, 44 Nut (first and second nut)

Claims (9)

An air filter mounting mechanism for mounting an air filter unit inside a casing that opens on the front side,
A rod-like member extending in the front-rear direction, a holding member to which the rod-like member is attached, fixed to the inner peripheral surface of the casing, and attached to the rod-like member, the air filter unit being placed inside the casing A fixture for mounting,
The holding member is provided with a fixing piece having a through hole, a regulating piece provided to face the front side of the fixing piece and having a through hole positioned so as to correspond to the through hole of the fixing piece, and the fixing A first connecting piece for connecting the piece and the regulating piece;
The rod-shaped member is fixed to the fixed piece through the through hole of the fixed piece and the restricting piece,
The air filter mounting mechanism, wherein the fixture includes a pressing piece that is disposed on the front side of the restriction piece and presses the air filter unit from the front side. The fixing device further includes a facing piece provided facing the rear side of the pressing piece, and a second connection piece that connects the facing piece and the pressing piece,
Each of the pressing piece and the opposing piece has a through-hole through which the rod-shaped member passes at a position corresponding to each other,
The air filter mounting mechanism according to claim 1, wherein the facing piece is disposed between the restriction piece and the fixed piece. The pressing piece has one end side in the first direction pressing the front surface of the filter unit, and the other end side arranged outside the outer peripheral surface of the filter unit,
The second connection piece is disposed on the outer side of the outer peripheral surface, and in the second direction orthogonal to the first direction, the rod-shaped member is sandwiched between the first connection piece and the first connection piece. The air filter mounting mechanism according to claim 2, which faces each other.   The air filter mounting mechanism according to claim 1, wherein the first connection piece is disposed substantially perpendicular to an inner peripheral surface of the casing.   The holding member includes an attachment piece that is disposed along the inner peripheral surface of the casing and is fixed to the inner peripheral surface, and the attachment piece is connected to the first connection piece substantially vertically. The air filter mounting mechanism according to claim 1, wherein: Each of the fixed piece and the restricting piece includes an end surface facing the inner peripheral surface of the casing,
The air filter mounting mechanism according to claim 1, wherein a distance between the end surface and the through hole in the fixed piece is longer than a distance between the end surface and the through hole in the restricting piece.   The air filter mounting mechanism according to claim 1, wherein the through holes of the fixed piece and the restricting piece are round holes or notches. The rod-shaped member is a shaft portion of a bolt,
The bolt has a head arranged on the rear side of the fixed piece and is fixed to the fixed piece by a first nut screwed to the front side of the fixed piece. The air filter mounting mechanism according to 1. The rod-shaped member is a shaft portion of a bolt, and the shaft portion is passed through a through hole provided in the holding piece,
A second nut is screwed to the front side of the pressing piece of the bolt, and the pressing piece presses the air filter unit from the front side by the pressing force of the second nut. The air filter mounting mechanism according to claim 1.

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