JP2022131848A - Air filter and filter pack - Google Patents

Abstract

To provide an air filter which achieves high sealability, and to provide a filter pack.SOLUTION: An air filter includes: a filter material 30 having a pair of ventilation surfaces 31 orthogonal to an upstream-downstream direction and a pair of end surfaces 32 orthogonal to the pair of ventilation surfaces 31; a filter frame 10 which houses the filter material 30 with the ventilation surfaces 31 exposed; a sheet-like buffer material 40 which covers each end surface 32 and seals each end surface 32 and the filter frame 10; a hot melt adhesive 50 which fixes each end surface 32 and the sheet-like buffer material 40 to each other; and a shrinkage prevention member 60 disposed in at least a part of a surface 43, which faces the hot melt adhesive 50, of the sheet-like buffer material 40 and formed by a member having thermal shrinkage smaller than that of the sheet-like buffer material 40 at a melting point of the hot melt adhesive 50.SELECTED DRAWING: Figure 2

Description

The present invention relates to an air filter used for industrial air conditioning, building air conditioning, etc., and a filter pack constituting the air filter.

2. Description of the Related Art Conventionally, an air filter using a sheet-like cushioning material for sealing a gap between a filter pack and a filter frame is known. The sheet-like cushioning material is fixed with an adhesive or the like to the surface of the zigzag-folded filter medium on which the zigzags appear.

JP 2011-083713 A

Since the sheet-like cushioning material is fixed to the zigzag surface of the filter material, the contact area between the cushioning material and the filter material is small. For this reason, the cushioning material is likely to come off during transportation or during attachment to the filter frame, and there is a risk of impairing the sealing performance during use.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an air filter and a filter pack with high sealing performance.

In order to solve the above-described problems, an air filter according to the present invention includes a filter medium having a pair of ventilation surfaces orthogonal to the upstream and downstream directions and a pair of end surfaces orthogonal to the pair of ventilation surfaces, and the ventilation surfaces. A filter frame that is exposed to accommodate the filter medium, a sheet-like cushioning material that covers each of the end faces and seals each of the end faces and the filter frame, and a hot-melt adhesive that fixes each of the end faces and the sheet-like cushioning material. An adhesive and at least a part of the surface of the sheet-like cushioning material facing the hot-melt adhesive, and having a thermal shrinkage smaller than that of the sheet-like cushioning material at the melting point of the hot-melt adhesive. and an anti-shrink member comprising a member.

In the air filter and filter pack according to the present invention, high sealing performance is obtained.

The perspective view which shows an air filter from the front (upstream side). Sectional drawing which follows the II-II line of FIG. The figure which shows the upper end surface of a filter pack.

An embodiment of an air filter 1 and a filter pack 20 according to the present invention will be described with reference to the attached drawings.

FIG. 1 is a perspective view showing the air filter 1 from the front (upstream side).

FIG. 2 is a cross-sectional view taken along line II--II of FIG.

FIG. 3 is a diagram showing the upper end surface of the filter pack 20. FIG.

In the following description, "front (upstream side)", "back (downstream side)", "upper", "lower", "right" and "left" follow the definitions in FIGS.

The air filter 1 is an air filter 1 that can be used for a wide range of applications including, for example, industrial air conditioning and building air conditioning. The air filter 1 has a filter frame 10 and a filter pack 20 .

The filter frame 10 is a rectangular frame member that is open in the upstream and downstream directions. The filter frame 10 is made of, for example, a galvanized plate, a stainless steel plate, an aluminum plate, a resin, or the like, and is formed by combining a pair of vertically opposed upper and lower frame members 12 and a pair of horizontally opposed left and right frame members 13. It is formed. The filter frame 10 accommodates the filter pack 20 so as to surround the ventilation surface 31 of the filter pack 20 . The filter frame 10 has a flange 11 extending inwardly of the opening only at the downstream opening.

The filter pack 20 is replaceably attached to the filter frame 10 . The filter pack 20 has a filter medium 30 , a sheet-like cushioning material 40 , a hot-melt adhesive 50 and an anti-shrinkage member 60 .

The filter medium 30 has a substantially rectangular parallelepiped outer shape folded in a zigzag shape with a predetermined folding width. The filter medium 30 is made of fibrous material such as felt made of synthetic fibers or inorganic fibers, or non-woven fabric or woven fabric. The filter medium 30 has a pair of ventilation surfaces 31 orthogonal to the upstream and downstream directions, and a pair of upper and lower end surfaces 32 and a pair of left and right end surfaces 33 orthogonal to the pair of ventilation surfaces 31 . Each of the ventilation surfaces 31 has creases of the filter material 30 , and each of the upper and lower end surfaces 32 has the zigzag shape of the filter material 30 . In the filter medium 30 according to the present embodiment, each upper and lower end surface 32 has a rectangular shape having a longitudinal direction along the horizontal direction and a lateral direction along the front-rear direction.

Although the size of the filter medium 30 is not particularly limited, for example, a size in the range of 100 mm×100 mm×30 mm to 1500 mm×1500 mm×300 mm can be used. In addition, the filtration performance of the filter pack 20 is appropriately set, but if it is a prefilter, it is possible to use 30 to 99% of the filter medium 30 by the mass method, and if it is a medium performance filter, it is 20 to 20% by the counting method. 99% filter media 30 can be used.

The sheet-like cushioning material 40 covers the upper and lower end surfaces 32 of the filter medium 30 and seals between the upper and lower end surfaces 32 and the filter frame 10 . The sheet-like cushioning material 40 has a bent portion 41 that is bent toward the ventilation surface 31 of the filter medium 30 at each end along the front-rear direction. The bent portion 41 preferably has a width (vertical length) of 3 mm to 20 mm. If it is less than 3 mm, the bonding area with the filter pack 20 becomes too small, and the bonding strength may decrease. There is

The sheet-like cushioning material 40 seals between the filter medium 30 and the filter frame 10, and is made of a material capable of buffering the stress generated when the upper and lower end surfaces 32 of the filter medium 30 with relatively low strength come into contact with the filter frame 10. It is a cushioning material. The sheet-like cushioning material 40 is, for example, a foam made of rubber (such as polyurethane resin). Alternatively, the sheet-like cushioning material 40 may be non-woven fabric or glass fiber.

When the sheet-like cushioning material 40 is rubber, polyether-based urethane rubber, polyester-based urethane rubber, chloroprene rubber, ethylene propylene diene rubber, or the like can be applied. These rubbers preferably have a density of 10 to 100 kg/m ³ , more preferably 20 to 50 kg/m ³ . If the rubber is foamed, and if it is less than 10 kg/m ³ , there is a risk that the foam will have a large number of cells, resulting in poor sealing performance. If it is more than 100 kg/m ³ , the hardness may increase too much and the sealing performance may deteriorate.

When the sheet-like cushioning material 40 is a non-woven fabric, fibers of polyester, polyamide, polypropylene, polyethylene, etc. obtained by a chemical bond method, a thermal bond method, or a spunbond method can be applied.

When the sheet-like cushioning material 40 is made of glass fiber, it is possible to apply a dry non-woven fabric made from cotton-like (short fiber) raw materials with an average fiber diameter or less, and a dry non-woven fabric made of glass fiber with a density of 30 to 230 g/m ³ . is preferred.

The thickness of the sheet cushioning material 40 is preferably 1 to 10 mm. If the thickness is less than 1 mm, it is difficult to sufficiently seal the gap between the filter pack 20 and the filter frame 10. If the thickness is more than 10 mm, the filter medium 30 may be difficult to attach to the filter frame 10 having a rectangular opening. This is because the ventilation surface 31 of is narrowed.

Note that the sheet-like cushioning material 40 may be arranged on the left and right end surfaces 33 of the filter medium 30 in the same manner. That is, all the side peripheral surfaces surrounding the ventilation surface 31 of the filter medium 30 may be covered with the sheet-like cushioning material 40 .

The hot melt adhesive 50 is an adhesive made of polyolefin or the like that melts at, for example, 150 to 200 degrees and adheres when cooled. The hot-melt adhesive 50 adheres and fixes the upper and lower end surfaces 32 of the filter medium 30 and the sheet-like cushioning material 40 . The hot-melt adhesive 50 also functions as a sealing material between the filter medium 30 and the sheet-like cushioning material 40 .

The anti-shrinkage member 60 is a sheet-like member arranged on at least part of the inner surface 43 of the sheet-like cushioning material 40 facing the hot-melt adhesive 50 . Specifically, in the filter pack 20, the filter material 30, the hot-melt adhesive 50, the anti-shrinkage member 60, and the sheet-like cushioning material 40 are stacked in this order in the vertical direction. The shrinkage preventing member 60 is made of a member having a thermal shrinkage rate smaller than that of the sheet-like cushioning material 40 in the vicinity of the melting point of the hot melt adhesive 50 . That is, the anti-shrinkage member 60 is formed by the heat generated by the hot-melt adhesive 50 when the filter medium 30 and the sheet-like cushioning material 40 are bonded together by the hot-melt adhesive 50 in a high temperature state. It consists of a member having an amount of shrinkage smaller than the amount of shrinkage of When the sheet-like cushioning material 40 is urethane foam, the shrinkage-preventing member 60 is preferably made of, for example, a polyethylene sheet-like member (surface density: 130 g/m ² ). The anti-shrink member 60 may also be made of polyethylene terephthalate, polytetrafluoroethylene, or the like.

The anti-shrinkage member 60 is arranged on the sheet-like cushioning material 40 in the horizontal direction, which is the longitudinal direction of the upper and lower end surfaces 32 with a large amount of shrinkage, from the viewpoint of both shrinkage prevention and sealing performance of the sheet-like cushioning material 40 .

The filter pack 20 configured in this manner is inserted from the upstream opening of the filter frame 10 while the sheet-like cushioning material 40 cushions the inner peripheral surface 15 (FIG. 2) of the filter frame 10 . The filter pack 20 makes surface contact with the downstream flange 11 at the bent portion 41 of the sheet-like cushioning material 40 . During use, the filter pack 20 is pressed against the flange 11 by an air current, and the sealing performance of the air filter 1 is ensured. When replacing the filter pack 20, the filter pack 20 is easily replaced with a new one by removing it from the opening on the upstream side.

Next, assembly of the filter pack 20 will be described.

First, prepare the sheet-like cushioning material 40 in which the anti-shrinkage member 60 is arranged over the longitudinal direction. This anti-shrinkage member 60 is not fixed to the sheet-like cushioning material 40, but is only arranged. The hot-melt adhesive 50 is applied to the sheet-like cushioning material 40 with the inner surface 43 of the sheet-like cushioning material 40 on which the anti-shrinkage member 60 is arranged facing upward. At this time, the sheet-like cushioning material 40 shrinks due to the heat of the hot-melt adhesive 50 , but friction occurs due to surface contact with the shrinkage prevention member 60 having a smaller thermal contraction rate than the sheet-like cushioning material 40 . Therefore, the anti-shrinkage member 60 functions as a longitudinal shrinkage stopper of the cushioning sheet 40 and can reduce shrinkage of the cushioning sheet 40 . Next, the upper and lower end surfaces 32 of the filter medium 30 are arranged on the sheet-like cushioning material 40 . The hot-melt adhesive 50 solidifies as it cools, and bonds and fixes the filter material 30 and the sheet-like cushioning material 40 together.

In such an air filter 1, since the sheet-like cushioning material 40, which functions to cushion and seal between the filter frame 10 and the filter pack 20, is fixed with the hot-melt adhesive 50, it is difficult for the filter material 30 to come off. can be done. In addition, since the hot-melt adhesive 50 can also perform a sealing function between the filter medium 30 and the sheet-like cushioning material 40, the filter efficiency can be further improved. In addition, since the shrinkage prevention member 60 functions as a shrinkage stopper for the sheet-like cushioning material 40, the sheet-like cushioning material 40 is prevented from shrinking during assembly. Therefore, even if the hot-melt adhesive 50 is used, the sealing performance of the air filter 1 and the cushioning function between the filter frame 10 and the filter pack 20 can be prevented from being reduced.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

For example, the filter medium 30 may be folded to form a curved line to form a wavy shape, instead of being folded to form a straight line. Moreover, the filter medium 30 may be formed by forming a fibrous body into a cuboid (flat plate) shape instead of being folded in a zigzag shape.

In the air filter 1, an example in which the filter pack 20 is replaceable with respect to the filter frame 10 has been described, but the filter frame 10 and the filter pack 20 may be integrated.

1 Air filter 10 Filter frame 11 Flange 12 Upper and lower frame member 13 Left and right frame member 15 Inner peripheral surface 20 Filter pack 30 Filter medium 31 Ventilation surface 32 Upper and lower end surface 33 Left and right end surface 40 Sheet-like cushioning material 41 Bent portion 43 Inner surface 50 Hot melt adhesive 60 anti-shrinkage member

Claims (6)

a filter medium having a pair of ventilation surfaces orthogonal to the upstream and downstream directions and a pair of end surfaces orthogonal to the pair of ventilation surfaces;
a filter frame that exposes the ventilation surface and houses the filter medium;
a sheet-like cushioning material that covers each of the end faces and seals the end faces and the filter frame;
a hot-melt adhesive that fixes the end faces and the sheet-like cushioning material;
Shrinkage made of a member that is arranged on at least a part of the surface of the sheet-like cushioning material facing the hot-melt adhesive and has a thermal contraction rate smaller than that of the sheet-like cushioning material at the melting point of the hot-melt adhesive. and an air filter. 2. The air filter according to claim 1, wherein said filter medium is folded in a zigzag shape so that creases appear on each of said ventilation surfaces, and zigzag shapes appear on each of said end faces. each of the end faces has a longitudinal direction and a lateral direction;
3. The air filter according to claim 1, wherein said anti-shrinkage member is arranged on said sheet-like cushioning material over said longitudinal direction of each of said end faces. The filter pack according to any one of claims 1 to 3, wherein the sheet-like cushioning material is a cushioning material made of polyurethane resin. 5. The filter pack according to any one of claims 1 to 4, wherein said anti-shrinkage member is a sheet-like member made of polyethylene. A filter pack housed in a filter frame,
a filter medium that is folded in a zigzag shape and has a pair of air flow ventilation surfaces with fold lines and a pair of end surfaces that are perpendicular to the ventilation surfaces and have a zigzag shape;
a sheet-like cushioning material that covers each of the end faces and seals the end faces and the filter frame;
a hot-melt adhesive that fixes the end faces and the sheet-like cushioning material;
Shrinkage made of a member arranged on at least a part of the surface of the sheet-like cushioning material facing the hot-melt adhesive and having a thermal shrinkage rate smaller than that of the sheet-like cushioning material at the melting point of the hot-melt adhesive. and a filter pack.

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