JP2008221057A - Air filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance mountability of an air filter to a casing. <P>SOLUTION: The air filter 10 comprises a square shaped filter frame 11 and a filter medium 20 disposed inside the filter frame 11. Grips 42 are attached on an inner peripheral face of the filter frame 11. The grips 42 are disposed to a one opening part 18A side of the filter frame 11 rather than the filter medium. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an air filter, and more particularly to an air filter provided in a local exhaust device or the like used in asbestos removal work or the like.

  The indoor asbestos removal work is performed under a negative pressure so that the asbestos does not scatter to the outside, and the local exhaust system for discharging the indoor air has a filter unit so that the asbestos is not discharged to the outside. Is provided. As the filter unit, a unit in which a prefilter, a medium performance filter, and a HEPA filter are generally arranged in order from the indoor side is used. For example, these air filters are attached to the inside of the case from the front (opening surface) of a cylindrical attachment case such as a duct.

  However, the space for installing the local exhaust system for the above applications is limited, and the case cannot be made sufficiently large, so the gap between the case inner wall and the air filter is narrow, and the work of taking out each filter from the inside of the case takes time. It is often necessary. In particular, it is difficult to take out the HEPA filter arranged at the innermost side of the case from the case.

Conventionally, as described in Patent Document 1, side plates and reinforcing plates are provided on the upper, lower, left and right ends of the filter element folded into a pleat shape, and the outer peripheral surface of the reinforcing plate is provided to improve the mounting property. An air filter having a handle attached thereto is known. However, it is difficult to apply this air filter to a HEPA filter, and even if this filter is applied to an air filter of the type attached to the inside of the case from the front of the case, it cannot be said that extraction is easy.
JP 2001-239120 A

  Therefore, the present invention has been made in view of the above problems, and in particular, an object of the present invention is to improve the mountability of an air filter attached to the inside of the case from the front side of the cylindrical case.

  An air filter according to the present invention includes a filter frame, a filter medium disposed inside the filter frame, and a handle attached to the first opening side of the filter frame relative to the filter medium on the inner peripheral surface of the filter frame; It is characterized by providing.

  The handle is preferably attached to the inner peripheral surface so as to be displaceable so as to protrude from the first opening to the outside of the filter frame and to be stored in the inside of the handle. Further, it is preferable that a fixing portion fixed to the inner peripheral surface is provided, and the handle is attached so as to be rotatable around the fixing portion.

  The fixing portion is preferably fixed by a rivet that is inserted and attached from the outer peripheral surface side to the inner peripheral surface side of the filter frame. A first face guard for protecting the filter medium is disposed closer to the first opening than the filter medium, and a handle may be disposed further to the first opening than the first face guard. preferable.

  The filter frame is formed with a second opening facing the first opening, and a second face guard for protecting the filter medium is also disposed on the second opening side of the filter medium. It is preferable. Moreover, it is preferable that each of the first and second face guards is disposed separately from the edge portions on the first and second opening side of the filter frame.

  As described above, in the present invention, by attaching the handle to the inner peripheral surface of the air filter, it is possible to improve the mountability when the air filter is mounted on the cylindrical case from the front surface.

The present invention will be described below with reference to the drawings.
1 and 2 are a front view and a side view, respectively, showing an air filter 10 according to an embodiment of the present invention. In the following description, the top, bottom, left, and right in FIG. 1 will be described as top, bottom, left, and right, and the front side of the paper in FIG.

  The air filter 10 is a HEPA filter, and includes a filter frame 11, a filter medium 20, first and second face guards 30A and 30B (see FIG. 3), handle units 40A and 40B, and gaskets 50A and 50B. With. The filter frame 11 is formed in a rectangular or square square frame shape, and has openings 18A and 18B facing each other on the front side and the rear side. The front side opening 18A is the air intake side and the rear side opening. The portion 18B becomes the air exhaust side, and air flows from the front toward the rear.

  The filter frame 11 is made of a metal such as aluminum. The filter frame 11 includes an upper frame portion 12 and a lower frame portion 13 that are parallel to each other, a right frame portion 14 that connects the right end portions of the upper frame portion 12 and the lower frame portion 13, and an upper frame portion 12 and a lower frame portion 13. The left frame portion 15 is connected to the left end portion, and the right frame portion 14 and the left frame portion 15 are also arranged in parallel to each other. The front edge 71 and the rear edge 72 in each frame portion of the filter frame 11 protrude from the inner peripheral surface of each frame portion toward the center of the filter 10 and extend along each edge portion ( 3) is provided. A protruding portion 16A slightly protruding toward the inner side of the filter frame 20 (that is, the front or the rear), and a distal end portion of the protruding portion 16A further toward the inner peripheral surface of each frame portion. A second projecting portion 16B is provided to project. In addition, the front-end | tip part of the 2nd protrusion part 16B is spaced apart from the internal peripheral surface of each frame part (refer FIG. 3). The guard portion 16 prevents the adhesive from flowing out from the inner peripheral surface of each filter frame 20. Gaskets 50 </ b> A and 50 </ b> B are fixed to the front and back surfaces of the filter frame 11 in a square frame shape over the entire circumference.

  The filter medium 20 is formed in a substantially rectangular parallelepiped shape in which a sheet-like filter medium is folded in a zigzag manner, and is arranged inside the filter frame 11. 15, It fixes to the inner peripheral surface of each right side frame part 14 with adhesives, such as a urethane resin.

  The first and second face guards 30 </ b> A and 30 </ b> B (see FIG. 3) are arranged on the front side and the rear side of the filter medium 20 inside the filter frame 11 to protect the filter medium 20. The first and second face guards 30A and 30B are formed with innumerable punching holes in a rectangular (or rectangular) metal plate made of a metal such as aluminum. The first and second face guards 30A, 30B have filter media on the inner peripheral surfaces of the upper frame portion 12, the lower frame portion 13, the left frame portion 15, and the right frame portion 14, respectively. 20 and fixed by an adhesive.

  The first and second face guards 30A and 30B (see FIG. 3) are spaced apart from the front edge portion 71 and the rear edge portion 72 of each frame portion of the filter frame 11, respectively, and the front edge portion of the first face guard 30A. The separation distance from 71 is substantially the same as the separation distance from the rear edge portion 72B of the second face guard 30B. In addition, the separation distance between the filter medium 20 and the front edge portion 71 is substantially the same as the separation distance between the filter medium 20 and the rear edge portion 72, that is, the filter medium 20 has a width in the front-rear direction of the filter frame 11. Evenly arranged.

  The handle units 40 </ b> A and 40 </ b> B are attached to the right side frame portion 14 and the left side frame portion 15 that are arranged to face each other on the front side of the filter medium 20.

  3 and 4 are perspective views for explaining the handle unit 40A more specifically. Hereinafter, the handle unit 40A attached to the right frame portion 14 will be described, but the handle unit 40B attached to the left frame portion 15 also has the same configuration, and thus the description thereof will be omitted.

  As shown in FIGS. 3 and 4, the handle unit 40 </ b> A includes a fixed portion 41 fixed to the inner peripheral surface 14 </ b> A of the right frame portion 14 and a handle 42 attached to the fixed portion 41. The fixed portion 41 has a substantially rectangular base plate 41A and a substantially rectangular rising plate 41B that is vertically raised from one edge portion 41E in the width direction of the base plate 41A and has an L-shaped cross section. A cylindrical portion 41C whose axis extends along the edge portion 41F is connected to the edge portion 41F at the leading end of the rising plate 41B.

  The handle 42 is formed by connecting an elongated metal rod endlessly in a substantially rectangular shape. The handle 42 is supported by the fixed portion 41 so that a portion corresponding to one of the long sides of the rectangle is inserted into the cylindrical portion 41C, and thereby can rotate around the cylindrical portion 41C.

  The base plate 41A is placed on the inner peripheral surface 14A of the right frame portion 14 in front of the first face guard 30A so that the edge portion 41E side is disposed on the front side. It arrange | positions so that the 16 2nd protrusion part 16B may be followed. That is, the cylindrical portion 41C is disposed in front of the first face guard 30A and spaced from the first face guard 30A, and the handle 42 supported by the cylindrical portion 41C also includes the first face guard 30A and the filter. It arrange | positions ahead of the filter medium 20 (opening part 18A side). Further, as shown in FIGS. 1 and 3, the cylindrical portion 41 </ b> C is disposed so as to protrude toward the center of the air filter 10 rather than the tip portion of the guard portion 16.

  The handle 42 can be rotationally displaced forward about the cylindrical portion 41 </ b> C without being obstructed by the guard portion 16 by arranging the cylindrical portion 41 </ b> C so as to protrude from the guard portion 16. Therefore, as shown in FIG. 3, it can be arranged at a position protruding from the opening 18A to the outside of the filter frame 11. The handle 42 can also be rotationally displaced behind the air filter 10 to a position where it comes into contact with the first face guard 30A. Therefore, it can be stored inside the filter frame 11.

  The base plate 41A has two holes 41G and 41H for passing rivets, and holes 14G and 14H (see FIG. 2) at positions corresponding to the holes 41G and 41H of the right frame portion 14, respectively. Is drilled. Rivets 60 and 61 are inserted into and attached to the holes 14G and 41G and the holes 14H and 41H from the outer peripheral surface 14B side to the inner peripheral surface 14A side. The fixing portion 41 is attached to the right frame portion by the rivets 60 and 61. 14 is fixed. As the rivets 60 and 61, for example, after being inserted into the hole, the distal end portion on the outer peripheral surface 14B side is pulled out, so that the rivet distal end portion protruding from the inner peripheral surface 14A is expanded in diameter. A so-called pop rivet is used in which the fixing portion 41 is fixed by being sandwiched between a portion and a flange (not shown) of a rivet arranged on the outer peripheral surface 14B side.

  Next, the operation of the air filter according to the present embodiment will be described. The air filter 10 according to the present embodiment is attached to the inside of the case from the front (opening) of a cylindrical case member such as a duct, for example. After the air filter 10 is attached, a medium performance filter (not shown) is further attached in front of the air filter 10 inside the case. Here, in order to eliminate air leakage between the air filter 10 and the medium performance filter, the gasket 50A is attached so as to be in close contact with the filter frame of the medium performance filter. Therefore, there is almost no gap between the opening 18A of the air filter 10 and the medium performance filter. However, since the handle 42 is stored behind the opening 18A (that is, inside the filter frame) at this time, the handle 42 does not hinder the installation of the medium performance filter.

  When the air filter 10 is taken out, the handle is rotated and is disposed so as to protrude forward from the opening (that is, outside the filter frame). Then, the air filter 10 is pulled out from the case in a state where the handle 42 is gripped by the user, whereby the air filter can be easily taken out from the case.

  Further, in the present embodiment, since the first face guard 30A is arranged on the front opening 18A side, when the handle 42 is gripped and the air filter 10 is taken out, the user's hand or the like is the filter medium. The filter medium is prevented from being damaged by contact with 20. Further, the first face guard 30 </ b> A prevents the handle 42 from contacting the filter medium 20. Furthermore, even if a part of the filter medium is damaged, the second face guard 30B provided in the rear opening 18B prevents clean air from being contaminated by the scattering of the filter medium.

  Further, in the present embodiment, the first and second face guards 30A and 30B are arranged apart from the front edge portion 71 and the rear edge portion 72 of each frame portion of the filter frame. Accordingly, a hand can be inserted into the filter frame 11 from both the front opening 18A and the rear opening 18B. For example, the front edge 71 and the rear edge 72 of the upper frame 12 are provided. Can be carried and the air filter 10 can be carried. Further, when the front edge portion 71 and the rear edge portion 72 are gripped, the carrier's hand is applied to the tip of the guard portion 16 of the filter frame, but the tip of the guard portion 16 further protrudes into the filter frame 11. Therefore, the carrier's hand comes into contact with the tip of the guard portion 16 in a planar shape. Therefore, the transporter does not suffer pain even if the air filter 10 is carried for a long time, for example.

  Further, in the present embodiment, the rivets 60 and 61 for fixing the fixing portion 41 hardly project on the outer peripheral surface side, and the attachment of the air filter 10 to the inside of the case is not hindered by the rivet. Furthermore, since the rivet tip is pulled out outside the filter frame, it can be easily performed.

  In the present embodiment, the handle 42 is attached to the inner peripheral surface 14A via the fixing portion 41, but may be directly attached to the inner peripheral surface. Further, in the above description, the embodiment in which the handle is applied to the HEPA filter has been described. However, the handle may be applied to other filters.

It is a front view of an air filter concerning one embodiment of the present invention. It is a side view of the air filter concerning one embodiment of the present invention. It is a perspective view which shows a part of right side frame part. It is a perspective view which shows a handle unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Air filter 11 Filter frame 14 Right side frame part 14A Inner peripheral surface 15B Outer peripheral surface 18A, 18B Opening part 30A, 30B Face guard 40A, 40B Handle unit 41 Fixing part 42 Handle 60, 61 Rivet

Claims (7)

A filter frame,
A filter medium disposed inside the filter frame;
An air filter comprising: a handle attached to an inner peripheral surface of the filter frame closer to the first opening of the filter frame than the filter medium.   The handle is attached to the inner peripheral surface so as to be displaceable so that the handle can project from the first opening to the outside of the filter frame and can be stored and disposed inside the filter frame. Item 2. The air filter according to Item 1.   The air filter according to claim 1, further comprising a fixing portion fixed to an inner peripheral surface, wherein the handle is attached to be rotatable around the fixing portion.   The air filter according to claim 3, wherein the fixing portion is fixed by a rivet that is inserted and attached from the outer peripheral surface side to the inner peripheral surface side of the filter frame.   A first face guard for protecting the filter medium is disposed closer to the first opening than the filter medium, and the handle is further on the first opening side than the first face guard. The air filter according to claim 1, wherein the air filter is disposed in the air filter.   The filter frame is formed with a second opening opposite to the first opening, and a second face for protecting the filter medium on the second opening side than the filter medium. The air filter according to claim 5, wherein a guard is disposed. 7. The air filter according to claim 6, wherein each of the first and second face guards is spaced apart from an edge of the filter frame on the first and second opening side. 8. .

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