JPH0326904Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an air filter such as a HEPA filter.

(Prior art) Conventionally, in an air filter, the filter body, which has a separator interposed in each folded space of a corrugated filter medium folded in a zigzag pattern, is airtightly housed within a surrounding frame via a sealing material such as adhesive or glass cotton. Generally speaking.

(Problems to be Solved by the Invention) However, in the conventional air filter, both corrugated edges of the corrugated filter medium in the filter body are affected by expansion of the surrounding frame and loosening of the filter body due to changes in ambient temperature during use. This has the disadvantage that a gap is created between the housing and the surrounding frame, resulting in a bypass leak.

(Means for Solving the Problems) The present invention aims to eliminate the above-mentioned conventional inconveniences and provide an air filter that does not cause bypass leaks even if the ambient temperature changes during use. In this air filter, a filter body, in which a separator is interposed in each folded space of a corrugated filter medium bent in a zigzag shape, is hermetically housed in an enclosing frame via a sealing material, in which both corrugated edges of the corrugated filter medium and It is characterized in that a sealing material formed by folding a band-like material into a wave shape so as to be expandable and contractible is interposed between the surrounding frame and the surrounding frame.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 in the figure indicates a metal enclosure with a substantially square cross section;
Reference numeral 2 indicates a filter body that is hermetically housed within the surrounding frame 1. The filter body 2 has synthetic resin in each folding space on the upstream and downstream sides of a corrugated filter medium 3 made of a glass fiber sheet or the like and folded in a zigzag shape.
The separators 4, 4, . . . made of metal foil, paper, etc., are bent in a zigzag shape and are interposed so as to abut at the top edges of the folds.

The above configuration is not particularly different from the conventional air filter, but according to the air filter of the present invention, both the corrugated edges 3a, 3a of the corrugated filter medium 3 and the surrounding frame 1
A sealing material 5 made of a band-shaped material folded into a wave shape so as to be expandable and contractible is interposed between the two. The band material can be made of various materials such as synthetic resin and paper, but if it is made of a filter material made of a glass fiber sheet or the like similar to the corrugated filter material 3, the sealing performance of the seal material 5 will be even better. become something.

Note that since both linear edges 3b, 3b of the corrugated filter medium 3 are planar, the edges 3b are in close contact with the surrounding frame 1, so there is no particular risk of bypass leak between the two, so Although the adhesive 6 is used for sealing according to the law, the sealing material 5 may be used instead. FIG. 3 shows a modification of the air filter of the present invention. In the embodiment described above, the sealing material 5 was directly interposed between the corrugated edges 3a, 3a of the corrugated filter medium 3 and the surrounding frame 1. In this modification, glass cotton 7 is further interposed as a sealing material between the corrugated filter medium 3 and the seal 5 to reinforce the sealing properties of the sealing material 5.

Thus, in the above-mentioned embodiment of the air filter of the present invention and its modifications, even if the ambient temperature rises to about 250° C. during use, causing expansion of the surrounding frame 1 and loosening of the filter body 2, the air filter can be folded. The expandable sealing material 5 expands as the temperature rises to prevent bypass leaks between the surrounding frame 1 and the filter body 2, and expands as the ambient temperature decreases thereafter. The sealed sealing material 5 contracts.

(Effects of the invention) As explained above, according to the air filter of the invention, a sealing material formed by folding a strip material into a corrugated shape and making it expandable and contractible is provided between both corrugated edges of the corrugated filter medium and the surrounding frame. Therefore, even if the surrounding frame expands or the filter body loosens during use, the sealing material interposed between both corrugated end faces of the corrugated filter medium and the surrounding frame will expand and contract according to changes in ambient temperature. However, bypass leakage between the corrugated edge and the surrounding frame can be effectively prevented, and the sealing performance is improved.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of the air filter of the present invention, FIG. 2 is a side sectional view thereof, and FIG. 3 is a side sectional view of a modified example of the air filter of the present invention. 1... Surrounding frame, 2... Filter body, 3... Corrugated filter medium,
3a... Waveform edge, 4... Separator, 5... Sealing material.

Claims (1)

[Scope of utility model registration request] In an air filter in which a filter body, in which a separator is interposed in each folded space of a corrugated filter medium bent in a zigzag shape, is hermetically housed in an enclosing frame via a sealing material, both corrugated edges of the corrugated filter medium and the surrounding An air filter characterized in that a sealing material formed by folding a band-like material into a wave shape so as to be expandable and contractible is interposed between the air filter and the frame.