JPH0724235A - Air filter - Google Patents

Abstract

PURPOSE:To obtain an air filter easy to fabricate and disassemble by folding strop into a frame shaped loop and joining the ends of the strip to constitute a filter supporting frame. CONSTITUTION:The side face 11, front face 12, back face 13 and connecting part 14 of a filter supporting frame 1 to be used for an air filter are integrally formed with a strip 10 of steel sheet having about 1mm thickness in the development. When the strip is folded into a loop, a V-shaped notch 15 is provided on a folding line 11a by opening the front face 12 and back face 13 at an angle of about 90 deg.. The strip is folded and connected at the connecting part 14 to constitute the supporting frame, and a filter medium is placed in the frame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air filter for coarse dust, medium performance and high performance, and more particularly to improvement of a filter support frame of an air filter constructed by housing a filter medium in the filter support frame.

[0002]

2. Description of the Related Art Conventionally, an air filter of this type is connected to a frame member in a frame-like shape through connecting metal fittings like the air filter disclosed in Japanese Patent Laid-Open No. 4-305251 proposed by the present applicant. Then, the filter support frame is assembled, and the filter medium is housed in the filter support frame.

[0003]

However, in the structure like the above-mentioned conventional air filter, the filter support frame is assembled by connecting the frame members in the shape of the surrounding frame using the connecting metal fittings or the like, so that the filter support frame is assembled. There is a problem that not only the number of constituent articles increases but the manufacturing process of the filter support frame becomes complicated, but also it is difficult to assemble the frame member into the enclosure shape with accurate dimensional accuracy. Further, when the joint portion of the frame member is displaced, the airtightness is not lowered, and a protrusion is formed on the filter support frame, which causes a problem in safety in manufacturing the filter or installing the filter. was there. In addition, dismantling work is also time-consuming. Therefore,
An object of the present invention is to provide an air filter that is easy to manufacture and easy to dismantle by employing a filter support frame that is easy to manufacture and easy to dismantle.

[0004]

In order to achieve the above-mentioned object, the air filter of the present invention comprises a filter support frame formed by bending a strip-shaped body into a frame shape and joining the ends of the strip-shaped body with a filter medium. Characterized by being housed. In addition, it is preferable that the band-shaped body is configured as a gutter-shaped band-shaped body. If the strip is not formed in a gutter shape, it is necessary to further attach a frame material for pressing the outer edge of the filter medium to the filter support frame. No need for frame material Further, by providing a cutout portion in the bent portion of the band-shaped body and forming the filter support frame by bending the band-shaped body through these cut-out portions, the band-shaped body is processed into an accurate surrounding frame shape. It is preferable above. Further, the strip may be formed by punching out a thin steel plate, or may be an extrusion formed of a steel material or a plastic material, and particularly in the case of a gutter-shaped strip, a paper tube, a steel tube, a plastic tube, etc. Cut the tube in half,
After that, a cutout portion or the like may be cut out as required.

[0005]

According to the air filter of the present invention, since the band-shaped body is bent into the shape of the surrounding frame and the end portions of the band-shaped body are joined to form the filter support frame, the filter support frame has no joint. Since the filter support frame can be obtained only at the places where the band-shaped body is bent into the shape of the surrounding frame, the assemblability is good, the disassembly is easy, and the replacement and disposal of the filter medium are easy.

[0006]

Embodiments of the air filter of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the air filter of the present invention, in which a filter medium 2 is housed in a filter support frame 1 formed in a rectangular frame shape. In the air filter of this embodiment, the floor material 3 is provided between the filter support frame 1 and the filter material 2.
And the gasket 4 was attached to the outer peripheral surface of the filter support frame 1.

The filter support frame 1 used for the air filter has a thickness of about 1 as shown in a developed view in FIG.
The side surface portion 11, the front surface portion 12, the back surface portion 13, and the connecting portion 14 are integrally formed of a thin steel plate of mm, and the front surface portion 1 is located at the position of the bending line 11a when bending into a frame shape.
It is formed by preparing a strip-shaped body 10 in which a V-shaped notch portion 15 that opens at approximately 90 ° is provided on the rear surface 2 and the back surface portion 13, bends this, and connects at a connecting portion 14.

The V-shaped notch portion 15 has its V-shaped apex approximately 1 to 1.5 mm from the bending lines 12a, 13a of the front portion 12 and the rear portion 13, respectively. It is formed so as to be cut out so as to enter the portion 13 side. In this way, the V-shaped apex is formed on the front surface 1
2 and the back surface 13 side, the strip 1
The front portion 12 and the rear portion 13 do not bulge outward of the filter support frame 1 when the 0 is bent into the shape of a surrounding frame. The front portions 12 and 12 and the rear portions 13 and 13 are bent in a state where they are attached to each other with accurate dimensional accuracy.

As shown in FIGS. 3 and 4, the strip 10 in the unfolded state is formed by bending the front portion 12 and the back portion 13 by 90 ° along bending lines 12a and 13a.
To form a trough, and then fold line 1 as shown in FIG.
3 without bending one side along 1a and 11a
It is folded into a frame shape composed of sides, then the floor material 3 is interposed and then the filter medium 2 is housed, and then the remaining side is bent and riveted at the connecting portion 14 to assemble the air filter of FIG. is there. Although the floor material 3 is provided only on one side of the filter support frame 1 in this embodiment, it may be provided on each side of the filter support frame 1. If necessary, the airtightness of the air filter may be increased by using a sealant or the like as in the conventional case.

In the above-described embodiment, the connecting position of the band-shaped member 10 is the corner of the filter supporting frame, but the connecting place is not particularly limited, such as the central part of one side of the filter supporting frame.

Further, in the above-mentioned embodiment, a nonwoven fabric made of synthetic fibers, inorganic fibers or the like is folded, and the peaks thereof are fixed with a ribbon-shaped spacing member, or a filter pack-shaped filter medium or a dry type of synthetic fibers or inorganic fibers. As an example of using a filter material such as felt that is not easily deformable, the filter material was stored in the filter support frame before the filter support frame was completely assembled. After the assembly, the filter medium may be deformed and incorporated into the filter support frame.

Further, in the above-mentioned embodiment, the filter supporting frame is formed by bending the band-shaped body integrally formed by the thin steel plate.
Alternatively, a plastic or steel material may be extrusion-molded in a gutter shape, and a band-shaped body provided with a notch portion or a connecting portion may be bent into an enclosure shape to form a filter support frame. Further, in the above-described embodiment, the connecting portion is riveted, but the method of connecting the filter support frame is not particularly limited to such a method, and a bolt tightening, a tape fixing, or an engaging mechanism is provided. The connecting method such as connecting by the connecting portion is arbitrary.

Further, as shown in FIG. 6, a paper tube 20 having a square cross section is cut in half as shown by a broken line, and a V-shaped notch portion 21 and the like are formed in the paper tube 20. It is also possible to form a gutter-shaped strip 30 as shown, and fold this into an enclosing frame shape in the same manner as in the above embodiment to form a filter support frame. When the paper tube 20 is used as described above, a filter supporting frame having sufficient strength and easy to manufacture can be easily obtained, and in addition, incineration can be performed at the time of discarding, which is extremely useful.

[0014]

As described above, according to the air filter of the present invention, it is possible to obtain an air filter that is easy to manufacture, easy to disassemble, and easy to replace and discard the filter medium.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of an air filter of the present invention.

FIG. 2 is a development view of a filter support frame used in the above embodiment.

FIG. 3 is a front view showing an assembled state of the filter support frame.

FIG. 4 is a plan view showing an assembled state of the filter support frame.

FIG. 5 is a front view showing an assembled state of the air filter.

FIG. 6 is a perspective view showing one step of a manufacturing method of a modification of the filter support frame.

FIG. 7 is a perspective view showing a modified example of the filter support frame.

[Explanation of symbols]

 1 Filter Support Frame 2 Filter Material 3 Floor Material 4 Gasket 10 Strips 11 Side Part 12 Front Part 13 Back Part 14 Connecting Part 15 Cutout 20 Paper Tube 21 Cutout 30 Strip

Claims (5)

[Claims] 1. An air filter characterized in that a filter medium is housed in a filter support frame formed by bending a belt-like body into a frame shape and joining end portions of the belt-like body. 2. The air filter according to claim 1, wherein the band-shaped body is a gutter-shaped band-shaped body. 3. The air according to claim 1, wherein notches are provided in the bent portions of the belt-like body, and the belt-like bodies are bent through the notches so as to surround the belt-like body. filter. 4. The air filter according to claim 2, wherein the band-shaped body is formed by cutting a tube having a rectangular cross section into a gutter shape. 5. The air filter according to claim 1, wherein a connecting side is integrally formed at an end of the band-shaped body.