JP2011110456A - Air filter installation mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate attachment of a bolt to a bolt-receiving part. <P>SOLUTION: A bolt is fixed in the bolt-receiving part 30, and a fixing implement fixing an air filter unit to a casing is attached to the bolt. The bolt-receiving part 30 has a bolt hole 32 consisting of a notch a part of which is formed from one end 30A of the bolt-receiving part 30. One end 30A of the bolt-receiving part 30 is folded to the side of the back surface 30C so as to form a pair of rotation-stopping projections 34 and 34. A bolt shaft is inserted into the bolt hole 32 so that the head of the bolt is arranged on the back surface 30C. The bolt is fixed with a nut screwed on the side of the front surface 30D of the bolt-receiving part 30. The head of the bolt is arranged partially between the pair of the rotation-stopping projections 34 and 34. When the nut is screwed with the bolt, the rotation of the bolt is regulated by the rotation-stopping projections 34 and 34. <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, and more particularly to a bolt receiving portion for fixing a filter fixture to the casing side.

  2. Description of the Related Art Conventionally, an air filter unit is housed inside a casing provided on a ceiling surface, for example, and is fixed to the casing by pressing the front side with a fixture screwed to a bolt attached to the casing side. (For example, refer to Patent Document 1). The bolt is generally fixed to the bolt receiving portion by welding or the like after being passed through a hole formed in the bolt receiving portion on the inner peripheral surface of the casing.

JP 2009-95811 A

  However, when the bolt is fixed to the bolt receiving portion by welding or the like, there is a problem that it is difficult to replace the bolt after fixing the bolt, and there is a possibility that the bolt may be fixed to the bolt receiving portion in an inclined state.

  Furthermore, it is conceivable to fix the bolt to the bolt receiving portion with a nut. In such a case, it is necessary to screw the nut in a state where the bolt is pressed by the operator's hand. However, space restrictions are large in the casing, and it is usually difficult to hold down the bolt when screwing the nut.

  The present invention has been made in view of the above problems, and an air filter mounting mechanism capable of easily mounting and replacing bolts used for mounting an air filter unit on a casing on a bolt receiving portion. The purpose is to provide.

  An air filter mounting mechanism according to the present invention is an air filter mounting mechanism for mounting an air filter unit, in which a filter medium is housed in a filter frame, inside a casing, and a bolt receiver attached to the inner peripheral surface of the casing. And a bolt that is fixed to the bolt receiving portion, and a fixture that is attached to the bolt and that presses the front surface of the filter frame and attaches the air filter unit to the casing. The bolt receiving portion is provided with a bolt hole. In the bolt, the shaft portion is passed through the bolt hole, the head is disposed on the back side of the bolt receiving portion, and is fixed to the bolt receiving portion by a nut screwed to the front side of the bolt receiving portion. A pair of detent protrusions are erected on the back surface of the bolt receiving portion so as to sandwich a part of the head.

  The bolt hole is a notch formed from one end portion of the bolt receiving portion, and the detent protrusion is preferably erected so as to sandwich the notch at the one end portion.

  The notch is, for example, a notch formed by both side portions facing each other and a bottom portion. In the pair of anti-rotation projection pieces, it is preferable that the inner edge end faces facing each other are continuous to both sides. It is more preferable that a notch recessed from the inner edge end surface and the side portion is formed in a connection portion between the rotation preventing projection piece and one end portion.

  The head may have a polygonal shape, and a side portion of the head constituting one side of the polygon may be fitted between the rotation-preventing protrusions. In this case, it is preferable that the outer surfaces of the non-rotating projection pieces are arranged on the same plane, and the outer surfaces are arranged on the same plane as the side portions arranged between the projection pieces. For example, the outer surface of the anti-rotation protrusion is arranged along the outer peripheral surface of the filter frame.

  The head portion of the bolt may have a polygonal shape, and the vertex portion of the polygonal shape of the head portion may be disposed so as to protrude outward from between the rotation preventing projection pieces.

  It is preferable that the bolt receiving portion is formed in a plate shape, and the anti-rotation protrusion is formed by exhibiting a shape in which one end portion side of the bolt receiving portion is bent. More preferably, the anti-rotation projection piece is formed by bending both side plate portions constituting both side portions of the long cutout of the plate member provided with the long cutout formed from one end portion.

  According to the present invention, since the rotation of the bolt is restricted by the non-rotating projection piece, the bolt can be easily attached to and removed from the bolt receiving portion provided on the casing side.

It is a perspective view of the air filter device of the present invention. It is a side view which shows the air filter attachment mechanism which concerns on the 1st Embodiment of this invention. It is a rear view which shows the bolt receiving part which concerns on 1st Embodiment. It is a front view which shows the bolt receiving part which concerns on 1st Embodiment. It is a perspective view which shows the bolt receiving part which concerns on 1st Embodiment. It is a top view which shows the board member for manufacturing the bolt receiving part which concerns on 1st Embodiment. It is a side view which shows the air filter attachment mechanism which concerns on 2nd Embodiment. It is a rear view which shows the bolt receiving part which concerns on 2nd Embodiment. It is a front view which shows the bolt receiving part which concerns on 2nd Embodiment. It is a top view which shows the board member for manufacturing the bolt receiving part which concerns on 2nd Embodiment. It is a side view which shows the air filter attachment mechanism which concerns on 3rd Embodiment. It is a rear view which shows the bolt receiving part which concerns on 3rd Embodiment. It is a front view which shows the bolt receiving part which concerns on 3rd Embodiment. It is a top view which shows the board member for manufacturing the bolt receiving part which concerns on 3rd Embodiment. It is arrow sectional drawing on the AA line in FIG. It is arrow sectional drawing on the BB line in FIG. It is a perspective view which shows the modification of the bolt receiving part of 1st 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 according to the first embodiment. The air filter device 10 includes a casing 11 and an air filter unit 21. The air filter unit 21 includes a filter frame 13 opened in the front-rear 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 surface (front surface). 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 air filter unit 21 is housed inside the casing 11 from the lower surface of the casing 11, and 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.

  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 guard 15 is formed by punching a number of punching holes in a metal plate. The face guard 15 protects the filter medium 14 by being disposed inside the filter frame 13 on the lower surface side and the upper surface side of the filter medium 14.

  As shown in FIG. 2, the bottom surface 11 </ b> A 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 fixture 20 presses the front surface 16 of the filter frame 13, 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.

  Inside the casing 11, a gap is provided between the inner peripheral surface of the casing 11 and the outer peripheral surface of the filter frame 13, and a bolt receiving portion 30 attached to the inner peripheral surface of the casing 11 is provided in the gap. . The bolt receiving part 30 is arranged corresponding to each fixture 20. The bolt receiving portion 30 is formed in a plate shape and is disposed perpendicular to the vertical direction (that is, the front-rear direction of the air filter unit 21). Is established. The mounting plate portion 33 is disposed along the inner peripheral surface of the casing 11 and is fixed to the inner peripheral surface of the casing with screws or the like. The anti-rotation protrusion 34 is disposed along the outer peripheral surface of the filter frame 13.

  A bolt hole 32 is provided in the bolt receiving portion 30. A shaft portion 41 of a bolt 40 extending in the vertical direction is passed through the bolt hole 32, and a head portion 42 of the bolt 40 is disposed on the back surface 30 </ b> C side of the bolt receiving portion 30. The bolt 40 is fixed to the bolt receiving portion 30 by a nut 43 screwed from the front surface 30D side of the bolt receiving portion 30. The height of the anti-rotation protrusion 34 is higher than the height of the head portion 42 of the bolt 40, and the tip thereof is arranged above the tip of the bolt head portion 42 (that is, on the back side). Further, the height of the mounting plate portion 33 is higher than the height of the non-rotating projection pieces 34 and 34.

  The fixture 20 is provided with a hole 22 through which the shaft portion 41 is passed, and extends rearward along the shaft portion 41 from a pressing portion 23 for pressing the filter frame 13 and a side end portion of the pressing portion 23. The raised portion 24 includes a raised portion 24, and an opposed portion 26 that is connected to the raised portion 24, faces the pressing portion 23, and is provided with a hole 25 through which the shaft portion 41 is passed. The fixture 20 is attached to the bolt 40 by passing the shaft portion 41 through the holes 22 and 25. The pressing portion 23 is pressed by a nut 27 screwed from the front side thereof, thereby pressing the filter frame 13. In addition, as for the fixing tool 20, the standing part 24 and the opposing part 26 may be abbreviate | omitted.

  Next, the bolt receiving portion will be described in detail with reference to FIGS. In the bolt receiving portion 30 formed in a plate shape, the bolt hole 32 is a notch formed from one end portion 30A of the bolt receiving portion 30, and has a semicircular shape with both side portions 32A and 32A facing each other. It is constituted by the bottom 32B. The bolt hole 32 extends toward the other end 30 </ b> B of the bolt receiving portion 30.

  The bolt 40 is disposed inside the bolt hole 32 so that the outer periphery of the shaft portion 41 is in contact with the bottom portion 32B. The bolt 40 is a hexagonal bolt, and its head 42 is formed in a regular hexagon. That is, the head portion 42 has six vertex portions 42A that constitute hexagonal vertices and six side portions 42B that constitute hexagonal sides. The shaft portion 41 is a male screw having a thread groove.

  The bolt receiving portion 30 has a shape in which both end portions 30A and 30B are bent at 90 ° on the back surface 30C side. Thereby, on the back surface 30C of the bolt receiving portion 30, a pair of detent protrusions 34, 34 are erected on the same plane so that the bolt hole 32 is sandwiched between the one end portion 30A and the mounting plate portion on the other end portion 30B. 33 is erected. Further, the inner edge end faces 34A and 34A of the rotation preventing protrusions 34 and 34 facing each other are continuous with the side portions 32A and 32A, respectively.

  The bolt receiving portion 30 gradually increases in width from the one end portion 30A toward the other end portion 30B, and exhibits a trapezoidal shape. The attachment plate portion 33 is formed in a substantially rectangular plate shape having substantially the same width as the width of the bolt receiving portion 30 in the other end portion 30B. Each of the anti-rotation protrusions 34 and 34 is also formed in a substantially rectangular plate shape, and the distance between the outer edge end surfaces 34B and 34B is substantially equal to the width of the bolt receiving portion 30 at the one end portion 30A.

  The distance L1 between the side portions 32A and 32A of the bolt hole 32 (that is, the width of the bolt hole 32) L1 is constant and equal to the diameter of the bottom portion 32B. The separation distance L <b> 1 is substantially the same length as the outer diameter of the shaft portion 41, thereby preventing the shaft portion 41 from being displaced in the width direction inside the bolt hole 32. Further, the separation distance L2 between the inner edge end faces 34A, 34A of the rotation preventing projections 34, 34 is constant and equal to the separation distance L1.

  A part of the head portion 42 of the bolt 40 disposed on the back surface side of the bolt receiving portion 30 is sandwiched and disposed between the non-rotating projection pieces 34 and 34. Specifically, as is apparent from FIGS. 2 and 3, the head portion 42 having a hexagonal shape is arranged such that one apex portion 42 </ b> A protrudes outward from the rotation stopper protrusions 34 and 34. The two side surface portions 42B and 42B connected to the one apex portion 42A are respectively connected to the corner portions 65 and 65 of the anti-rotation projection pieces 34 and 34 (the connection portion between the inner surface 34C of the anti-rotation projection piece 34 and the inner edge end surface 34A). ) Abut each. In the present embodiment, the separation distance L2 is slightly shorter than the length L3 of one side of the head 42 (that is, the length of the side surface portion 42B). The entire side surface portion 42 is not inserted.

  With the above configuration, the head portion 42 of the bolt 40 is restricted from rotating about the axis by the non-rotating protrusions 34 and 34. Accordingly, when the nut 43 is rotated and screwed to fix the bolt 40 to the bolt receiving portion 30, the bolt 40 is prevented from rotating by the rotational force of the nut 43. Further, even before the bolt 40 is fixed to the bolt receiving portion 30 by the nut 43, the bolt 40 is locked by the non-rotating protrusions 34 and 34 and can hardly move from the predetermined position. Therefore, even if the bolt 40 is not pressed by the operator's hand, the nut 43 can be rotated and screwed to fix the bolt 40 to a predetermined position of the bolt receiving portion 30. Similarly, it is possible to remove the bolt 40 by rotating the nut 43 without pressing the bolt 40.

  Furthermore, in this embodiment, since the bolt hole 32 is formed by a notch, the bolt 40 can be inserted into the bolt hole 32 from the one end 30A side. Therefore, for example, even when the distance between the bottom surface 11A side of the casing 11 and the bolt receiving portion 30 is short and the bolt 40 cannot be inserted from the bottom surface 11A side, the bolt 40 can be easily inserted into the bolt hole 32.

  Next, the manufacturing method of the bolt receiving part 30 is demonstrated using FIG. When manufacturing the bolt receiving portion 30, first, a planar metal plate member 50 is prepared as shown in FIG. The plate member 50 is cut by laser processing or the like, and a long notch 51 formed from one end portion 50A of the plate member 50 and extending long toward the other end portion 50B is formed. Thus, the plate member 50 is formed with a base plate portion 52 and a pair of both side plate portions 53 and 53 that extend from the base plate portion 52 and constitute both side portions 51A and 51A of the long notch 51. In addition, the long notch 51 has a constant interval between both side portions 51A and 51A, and the bottom portion 51B has a semicircular shape.

  Thereafter, the plate member 50 is bent along the dashed line portion in FIG. That is, the both side plate portions 53 and 53 are bent at the midway portions 53C and 53C to form two anti-rotation projection pieces 34 and 34 on one end side, and the mounting plate portion 33 on the other end side. The bolt receiving part 30 is obtained by molding. Since the distance between the both side portions 51A and 51A of the long notch 51 is constant, the distances L1 and L2 are equal to each other as described above. The inner edge end surfaces 34A and 34A are respectively continuous with the side portions 32A and 32A of the bolt hole 32, and are disposed on the same plane as the side portions 32A and 32A.

  In addition, when the plate member 50 is bent along the alternate long and short dash line (halfway portion 53C), it is not actually bent completely linearly. As shown in FIG. It is connected to one end 30 </ b> A of the bolt receiving part 30 via a connection part 61 (for example, a 90 ° arc). Therefore, the head portion 42 arranged on the back surface 30C is obstructed by the curved inner surface of the connection portion 61, abuts only on the connection portion 61, and the corner portion 65 (connection portion between the inner surface 34C and the inner edge end surface 34A) It may not be able to contact sufficiently. That is, the head part 42 may contact the corner part 65 by making point contact with only a part P1 of the connection part 61.

Next, a second embodiment of the present invention will be described with reference to FIGS.
In the second embodiment, the difference from the first embodiment is the lengths of the distances L1 and L2. The distance L1 between both side portions 32A and 32A of the bolt hole 32 and the diameter of the bottom portion 32B are substantially the same length as the outer diameter of the shaft portion 41 as in the first embodiment. On the other hand, the separation distance L2 between the inner edge end faces 34A, 34A of the rotation preventing protrusions 34, 34 is longer than the distance L1, and is substantially equal to the side length L3 of the head 42 or slightly larger than the length L3. ing. As a result, the entire side surface portion 42B of the head portion 42 is fitted between the anti-rotation projection pieces 34, 34, and the side surface portion 42B is connected to the outer surfaces 34D, 34D of the anti-rotation projection pieces 34, 34. Arranged on the same plane.

  In the present embodiment, the two side surface portions 42B and 42B connected to the side surface portion 42B disposed between the rotation preventing protrusions 34 and 34 are in contact with the corner portions 65 and 65, respectively. Thereby, the rotation prevention protrusions 34 and 34 control that the volt | bolt 40 rotates with the rotational force at the time of screwing the nut 43 (refer FIG. 2). Further, by fitting the side surface portion 42B between the rotation preventing projections 34, 34, the head portion 42 of the bolt 40 can be stably disposed between the rotation preventing projections 34, 34.

  Further, the outer surfaces 34 </ b> D and 34 </ b> D and the side surface portion 42 </ b> B disposed on the same plane are substantially parallel to the outer peripheral surface of the filter frame 13 and are disposed along the outer peripheral surface of the filter frame 13. Accordingly, the outer surfaces 34D and 34D, together with the side surface portion 42B, serve as a guide member when the filter frame 13 (air filter unit 21) is inserted into the casing 11, and the air filter unit 21 can be easily stored in a predetermined position in the casing 11. It becomes possible.

  FIG. 10 shows a plate member 50 for manufacturing a bolt receiving part in the second embodiment. In the present embodiment, in the long notch 51, the separation distance between the both side portions 51A, 51A from the one end portion 50A to the midway portion 53C is longer than the separation distance between the both side portions 51A, 51A from the midway portion 53C to the bottom portion 51B. Become. Accordingly, the side plate portions 53 and 53 are bent at the midway portions 53C and 53C, so that the separation distance L2 between the rotation stop protrusions 34 and 34 can be made longer than the separation distance L1 (see FIG. 8).

  Next, a difference between the third embodiment of the present invention and the first embodiment will be described with reference to FIGS. In the present embodiment, as shown in FIG. 14, additional notches 60 and 60 that are recessed inward are formed in the middle portions 53C and 53C of the side portions 51A and 51A of the plate member 50 for manufacturing the bolt receiving portion. Except for this point, the second embodiment is the same as the first embodiment.

  Similar to the first embodiment, when the plate member 50 is folded at the alternate long and short dash line (that is, the midway portion 53C), the plate member 50 is not completely bent linearly. It is connected to the bolt receiving portion 30 via a connecting portion 61 having a 90 ° arc). Therefore, in the present embodiment, an additional notch 60 that is recessed from the inner edge end surface 34A of the anti-rotation protrusion 34 and the side portion 32A of the bolt hole 32 is formed in the curved connection portion 61. That is, the separation distance L2 between the rotation stop protrusions 34, 34 is equal to the bolt hole width L1, but is shorter than the separation distance L4 between the connection portions 61, 61.

  As described above, when the notch is formed in the connection portion 61, the head portion 42 can be brought into contact with the corner portion 65 without being obstructed by the connection portion 61 as shown in FIG. 15. That is, compared to the first embodiment, the head 42 is more easily disposed on the outer side (left side in FIG. 15). As a result, for example, as shown in FIG. 15, the head portion 42 can come into line contact with the portion P <b> 2 of the corner portion 62.

  As described above, in the present embodiment, the provision of the additional notch 60 makes it easier for the head portion 42 to come into contact with the anti-rotation projection piece 34, so that the rotation of the bolt 40 can be more reliably regulated.

  In the first embodiment, the bolt hole is not a notch, but may be a circular hole 70 whose entire periphery is closed as shown in FIG. The same applies to the second embodiment. Moreover, in each embodiment, although the head part of the volt | bolt was a regular hexagon, another polygon may be sufficient if it is a polygon.

DESCRIPTION OF SYMBOLS 10 Air filter apparatus 11 Casing 13 Filter frame 14 Filter medium 20 Fixing tool 21 Air filter unit 30 Bolt receiving part 32 Bolt hole 32A Side part 32B Bottom part 34 Anti-rotation protrusion 34A Inner edge face 40 Bolt 50 Plate member 60 Additional notch 61 Connection part

Claims (10)

An air filter mounting mechanism for mounting an air filter unit in which a filter medium is stored inside a filter frame inside a casing,
A bolt receiving portion attached to the inner peripheral surface of the casing, a bolt fixed to the bolt receiving portion, and a bolt attached to the bolt, pressing the front surface of the filter frame to attach the air filter unit to the casing. Mounting fixtures,
The bolt receiving portion is provided with a bolt hole,
The bolt has a shaft portion passed through the bolt hole, a head portion disposed on the back side of the bolt receiving portion, and fixed to the bolt receiving portion by a nut screwed to the front side of the bolt receiving portion. And
An air filter mounting mechanism, wherein a pair of detent protrusions are erected on the back surface of the bolt receiving portion so as to sandwich a part of the head.   The bolt hole is a notch formed from one end portion of the bolt receiving portion, and the detent projection piece is erected so as to sandwich the notch at the one end portion. The air filter mounting mechanism according to claim 1.   The notch is a notch formed by both side portions facing each other and a bottom portion, and the pair of anti-rotation protrusions have their respective inner edge end surfaces facing each other continuous to the both side portions. The air filter mounting mechanism according to claim 2.   The air filter mounting mechanism according to claim 3, wherein a notch that is recessed from the inner edge end surface and the side portion is formed in a connection portion between the rotation preventing protrusion and the one end portion.   2. The head according to claim 1, wherein the head has a polygonal shape, and a side portion of the head constituting one side of the polygon is fitted between the rotation-preventing protrusions. Air filter mounting mechanism.   The outer surface of the said rotation prevention protrusion is mutually arrange | positioned on the same plane, These outer surfaces are arrange | positioned on the same plane also with the said side part arrange | positioned between these protrusions. Air filter mounting mechanism.   The air filter mounting mechanism according to claim 6, wherein an outer surface of the anti-rotation projection piece is disposed along an outer peripheral surface of the filter frame.   The head of the bolt has a polygonal shape, and the apex of the polygonal shape of the head is arranged to protrude outward from between the rotation-preventing protrusions. The air filter mounting mechanism described.   2. The air according to claim 1, wherein the bolt receiving portion is formed in a plate shape, and the anti-rotation projecting piece is formed by exhibiting a shape in which one end portion side of the bolt receiving portion is bent. Filter mounting mechanism.   The anti-rotation protrusion is formed by bending both side plate portions constituting both side portions of the long notch of a plate member provided with a long notch formed from one end portion. The air filter mounting mechanism according to claim 2.

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