JP2021098161A - Filter pack, and air filter - Google Patents

Abstract

To easily remove fine particles held on a filter medium in a filter pack provided with the pleated filter medium.SOLUTION: A filter pack includes a pleated filter medium and a surrounding member which surrounds the filter medium circumferentially. The surrounding member includes two first fixing parts which sandwich the filter medium from both sides in an extension direction of a fold, and two second fixing parts which sandwich the filter medium from both sides in a direction orthogonal to the extension direction of the fold and a direction of an air flow passing through the filter medium. A displacement amount of the second fixing part along an orthogonal direction when the filter pack is compressed or elongated in the orthogonal direction becomes larger at the second fixing part which is farther from the first fixing part. A length of the filter pack along the orthogonal direction at the first position in a direction parallel to the extension direction of the fold is longer than at the second position in which the displacement amount of the second fixing part is smaller than the first position.SELECTED DRAWING: Figure 1

Description

The present invention relates to a filter pack including a pleated filter medium and an air filter.

As an air filter that collects dust floating in the air, a filter pack and a frame for accommodating the filter pack are used. The filter pack has, for example, a filter medium pleated to secure a collection area and folded into a zigzag shape.

When the amount of dust collected and held by the filter medium is large, it becomes difficult for air to flow through the filter medium, and the pressure loss tends to increase. As a conventional air filter, there is known one that is configured so that the frame can be reused while replacing the filter pack that has reached a predetermined amount of dust and has reached the end of its life (see, for example, Patent Document 1). ).

The air filter of Patent Document 1 is configured so that the filter pack can be removed from the upstream side of the filter frame in a filter frame having a flange extending to the ventilation surface side only on the downstream side of the ventilation path.

Japanese Unexamined Patent Publication No. 2011-83713

Even if the above air filter is configured so that the filter pack can be replaced, if it is used in a place where a large amount of dust floats, the amount of dust retained will reach a predetermined amount at an early stage, and the frequency of replacing the filter pack will increase. Therefore, it is not economical. Here, if the retained dust is removed from the filter pack removed from the frame, stored in the frame, and can be used again, the filter pack does not need to be replaced and the filter pack can be used continuously. However, it is not easy to remove dust from a pleated and zigzag-folded filter medium, and it is necessary to use, for example, a dedicated device.

An object of the present invention is to easily remove fine particles held in a filter medium in a filter pack including a pleated filter medium.

One aspect of the present invention is a filter pack.
A filter medium that collects fine particles in gas and is pleated,
A surrounding member that surrounds the filter medium so as to expose the folds of the pleats is provided.
The surrounding member
Two first fixing portions fixed to the filter medium so as to sandwich the filter medium from both sides in the extending direction of the fold.
It has two second fixing portions fixed to the filter medium so as to sandwich the filter medium from both sides in the extending direction of the fold and the direction orthogonal to the direction of the air flow passing through the filter medium.
When the filter pack is compressed or expanded in the orthogonal direction so that the adjacent spacing of the pleats changes, the displacement amount of the second fixing portion along the orthogonal direction is the displacement amount of the first fixing portion. The larger the portion of the second fixed portion away from the
The length of the filter pack along the orthogonal direction is such that the displacement amount of the second fixing portion at the first position in the direction parallel to the extending direction of the fold is larger than that of the first position. It is characterized by being longer than the smaller second position.

The length at the first position is obtained by deforming the second fixing portion by receiving at least the force of the filter medium that tries to widen the adjacent distance between the pleats. It is preferable that the length is longer than the above-mentioned length.

The bending strength of the second fixing portion in the out-of-plane direction ^{is preferably 3.0 N / mm 2} or less.

Each of the fixing portions has a plate-shaped structural material and has a plate-like structural material.
The structural material is
Sheets facing each other and
It is preferable to have a plurality of ribs extending in one direction and arranged at intervals from each other, each having a plurality of ribs connecting the sheets.

In the second fixing portion, the rib preferably extends in the extending direction of the fold.

In the first fixing portion, the ribs preferably extend in the orthogonal direction.

It is preferable that the surrounding member further has a covering member that covers the structural material.

It is preferable that the filter medium has a pair of protrusions provided so as to be in contact with each other by folding the filter medium at a portion of the filter medium forming adjacent pleats.

It is preferable that the filter medium is not provided with a reinforcing material that extends over the top of the pleats so as to extend in the orthogonal direction.

Another aspect of the present invention is an air filter.
With the filter pack
A frame body in which the filter pack is housed and in contact with the filter pack is provided.
The frame body is a frame side portion extending linearly, and has four frame side portions arranged so as to face each of the first fixed portion and the second fixed portion.
The second fixing portion is characterized in that it is deformed along the shape of the frame side portion by receiving the force of the filter medium in which the adjacent intervals of the pleats are to be widened.

According to the above aspect, in the filter pack including the pleated filter medium, the fine particles held in the filter medium can be easily removed.

It is an external perspective view which shows the filter pack by an example of this embodiment. (A) and (b) are diagrams for explaining the operation of the filter pack. It is a figure which shows the structural material of a fixed part. It is a figure which shows the cross section of the air filter by the plane extending in the airflow direction and the extending direction of a crease. It is a figure which shows the example of the frame body.

Hereinafter, the filter pack of the present embodiment will be described.
FIG. 1 is an external perspective view showing a filter pack 1 according to an example of the present embodiment.
The filter pack 1 includes a filter medium 3 and a surrounding member 5.

The filter medium 3 is a member that collects fine particles in a gas. The filter medium 3 is used for removing dust having a particle size of 0.7 μm or less and a concentration of 0.5 mg / m ³ or less, and has a collection efficiency of 65% or more by a counting method, a pressure loss of 79 to 493 Pa, and dust retention. A dust holding amount of 200 to 800 g / m ² is used. In the counting method, air having a particle size of 0.3 μm and containing particles of air dust, polyalphaolefin (PAO), or silica is ventilated for measurement. The dust holding capacity is the amount of dust collected by the filter before reaching a predetermined final pressure loss. Further, the filter medium 3 may be, for example, a filter medium for a HEPA filter, a filter medium for a ULPA filter, or a filter medium for a gas removal filter.

The filter medium 3 is, for example, a fiber body made of glass fiber, organic fiber, or a mixed fiber of these fibers, and is, for example, a non-woven fabric or felt. The filter medium 3 made of glass fiber is produced, for example, by making paper by a wet method or a dry method. The filter medium 3 made of organic fibers is produced by, for example, a spunbond method, a melt blow method, a thermal bond method, a chemical bond method, or the like. Further, the filter medium 3 may be, for example, a laminate of a plurality of non-woven fabrics having different collection efficiencies.

As shown in the figure, the filter medium 3 is pleated so that mountain folds and valley folds are alternately repeated. Pleat processing is performed using a reciprocating or rotary folding machine. The filter medium 3 is pleated and has a plurality of creases 3a.

The surrounding member 5 is a member that surrounds the filter medium 3 in a circumferential shape so that the folds 3a of the pleats are exposed. The filter medium 3 which has been pleated and folded so as to form a zigzag shape has a substantially rectangular parallelepiped outer shape. The pleated creases 3a are arranged so as to be exposed on two opposite surfaces of the six surfaces of the rectangular parallelepiped. The surrounding member 5 surrounds the filter medium 3 in a circumferential shape by being arranged so as to face the other four surfaces of the rectangular parallelepiped.

The surrounding member 5 has two first fixing portions 5a and b and two second fixing portions 5c and 5d.

The first fixing portions 5a and 5b are portions fixed to the filter medium 3 so as to sandwich the filter medium 3 from both sides of the crease 3a in the extending direction. In the following description, the extending direction of the fold 3a means the extending direction of the fold 3a extending linearly (Z direction in FIG. 1) among the plurality of folds 3a. The length of the first fixed portions 5a and 5b in the Y direction is substantially equal to the distance between two surfaces of the inner wall surface of the frame body 11 described later that face the Y direction.

The second fixing portions 5c and 5d are in the extending direction of the crease 3a and in the direction orthogonal to the direction of the airflow passing through the filter medium 3 (the X direction in FIG. 1, hereinafter also referred to as the airflow direction) (the Y direction in FIG. 1). Hereinafter, it is a portion fixed to the filter medium 3 so as to sandwich the filter medium 3 from both sides in the Y direction).

The second fixing portions 5c and 5d are fixed along the Y direction when the filter pack 1 is compressed or expanded in the Y direction so that the adjacent spacing of the pleats (hereinafter, simply referred to as the pleating spacing) changes. The larger the displacement amount of the portions 5c and 5d is the portion of the second fixed portions 5c and 5d away from the first fixed portions 5a and 5b, that is, the flexibility is provided. Since the second fixing portions 5c and 5d have flexibility, they can receive a force in the Y direction and bend so as to bulge or dent in the Y direction. The length of the second fixed portions 5c and 5d extending in a straight line in the X direction is substantially equal to the distance between the two surfaces of the inner wall surface of the frame 11 facing the X direction.

The length of the filter pack 1 along the Y direction is such that the displacement amount of the second fixed portions 5c and 5d at the first position in the direction parallel to the extending direction of the crease 3a is smaller than that at the first position. Longer than position 2. In other words, the length of the filter pack 1 along the Y direction is such that the length of the filter pack 1 is distant from the first fixing portions 5a and 5b in a direction parallel to the extending direction of the crease 3a, as shown in FIG. long. Specifically, in the filter pack 1, the length L1 at the first position is increased because the second fixing portions 5c and 5d are deformed by receiving at least the force of the filter medium 3 that tries to widen the pleating interval. , It is longer than the length L2 at the second position. In the filter pack 1, the filter medium 3 is folded so as to form a zigzag shape, and is further pressed in the Y direction and surrounded by the surrounding member 5, so that the force in the Y direction is applied to the second fixed portions 5c and 5d. To act. In the filter pack 1, the length L1 of the filter pack 1 is longer than the length L2 due to the force generated in the filter pack 1 including the force of the filter medium 3.

Since the second fixing portions 5c and 5d have flexibility in this way, the filter pack 1 of the present embodiment can change the length along the Y direction as shown in FIG. .. FIG. 2 is a diagram illustrating the operation of the filter pack 1. In FIG. 2, the crease 3a of the filter medium 3 is not shown. As shown in FIG. 2B, when the filter pack 1 receives a force to be compressed along the Y direction due to the flexibility of the second fixing portions 5c and 5d, the filter pack 1 receives Y. It can be compressed in the direction and have an inwardly recessed shape. Further, when the force for compressing the filter pack 1 is released from the filter pack 1 having a concave shape inward, the above-mentioned force of the filter medium 3 that tends to widen the pleating interval is applied to the second fixing portion 5c, By acting on 5d, as shown in FIG. 2A, it extends in the Y direction and returns to a shape that bulges outward. By applying and releasing such a compressing force in the Y direction to the filter pack 1 quickly, for example, 2 to 10 times, at least a part of the dust held in the filter medium 3 can be easily removed. Will be removed.

The bending strength of the second fixing portions 5c and 5d in the out-of-plane direction of the plane extending in the extending direction and the airflow direction of the crease 3a ^{is preferably 3.0 N / mm 2} or less, preferably ^{1.5 N / mm 2.} More preferably: When the bending strength is in such a range, it becomes easy to bend due to the force of the filter medium 3 trying to widen the pleating interval or the force of compressing the filter pack 1 in the Y direction. The lower limit of the bending strength of the second fixing portions 5c and 5d in the out-of-plane direction is, for example, 0.5 N / mm ² .

As shown in FIG. 1, the fixing portions 5a, 5b, 5c, and 5d are preferably connected to each other so as to be continuous in a circumferential shape.

It is preferable that each of the fixing portions 5a to 5d has a plate-shaped structural material. The plate-shaped structural material is arranged so as to face the above four surfaces of the filter medium 3 having a substantially rectangular parallelepiped shape. The structural material and the filter medium 3 are preferably bonded with an adhesive such as an acrylic material or a rubber material so as not to be peeled off during ventilation.

As a preferable form of the structural material, the form shown in FIG. 3 can be mentioned. FIG. 3 is a diagram showing the structural material 6. The structural material 6 shown in FIG. 3 has two sheets 6a and a plurality of ribs 6b. The sheets 6a are arranged so as to face each other, that is, parallel to each other. The ribs 6b extend in one direction (vertical direction in FIG. 3) and are arranged at intervals from each other. The ribs 6b connect the sheets 6a and 6a, respectively. Therefore, the structural material 6 has a hollow structure in which a plurality of spaces extending in one direction are arranged in parallel with each other. The thickness of the sheet 6a and the rib 6b is, for example, 0.5 to 4 mm, respectively. The thickness of the sheet 6a and the rib 6b are, for example, equal.

As a preferable material of the structural material 6 shown in FIG. 3, a plastic such as a polypropylene resin can be mentioned in that the flexibility of the second fixing portions 5c and 5d can be easily obtained. The structural material 6 made of a plastic material and shown in FIG. 3 is also called a plastic cardboard.

In the first fixing portions 5a and 5b, the rib 6b preferably extends in the Y direction. As a result, it is possible to prevent the first fixing portions 5a and 5b from being deformed so as to swell with respect to the force that compresses the filter pack 1 in the Y direction, as compared with the case where the ribs 6b are arranged so as to extend in the airflow direction. To.

It is preferable that the structural members 6 arranged in the fixing portions 5a to 5d are connected to each other by an adhesive and are continuous in a circumferential shape.

The structural material is not limited to the form shown in FIG. 3, and may be, for example, a plate material. As a preferable material for the plate material, a metal such as stainless steel or aluminum or a plastic is used.

As shown in FIG. 4, the surrounding member 5 preferably further includes a covering member 7 that covers the structural member 6. FIG. 4 is a diagram showing a cross section of the air filter 10 by a plane extending in the airflow direction and the extending direction of the crease (a plane orthogonal to the Y direction). In FIG. 4, the filter pack 1 is shown in a state of being housed in the frame body 11. Since the surrounding member 5 has the covering member 7, it is possible to prevent a gap between the filter pack 1 and the frame 11 when the filter pack 1 is housed in the frame 11, and prevent leakage. it can. The covering member 7 is preferably bonded to the structural material 6 with an adhesive such as an acrylic material or a rubber material.

Preferred materials for the covering member 7 include rubber, fibers, foams, and sponges, with rubber being preferred.

Examples of preferable rubbers include urethane rubbers such as polyether rubbers and polyester rubbers, chloroprene rubbers, and ethylene propylene diene rubbers (EPDM). The density of the rubber is preferably 10 to 100 kg / m ^3, and more preferably 20 to 50 kg / m ^3. According to one embodiment, the rubber is preferably a foam rubber having a plurality of independent bubbles or a plurality of bubbles in which some of the bubbles are continuous.

Examples of preferable fibrous bodies include non-woven fabrics. Examples of the non-woven fabric include those in which organic fibers such as polyester, polyamide, polypropylene, and polyethylene are made into a non-woven fabric by a chemical bond method, a thermal bond method, or a spunbond method, and those in which glass fibers are made into a non-woven fabric by a dry method. The glass fiber is preferably a short fiber having an average fiber diameter of 1 μm or less, for example.

The preferred form of the covering member 7 is in the form of a sheet. The thickness of the sheet-shaped covering member 7 is preferably 1 to 10 mm.

The covering member 7 preferably covers the entire surface of the surrounding member 5 facing the frame body 11.
Further, it is preferable that the covering member 7 is bent inward in a direction orthogonal to the airflow direction at least at the downstream end of both ends of the filter pack 1 in the airflow direction. As a result, it is possible to prevent a gap from being formed between the flange 11e provided at the downstream end of the frame 11 in the airflow direction and the filter pack 1. The length of the portion of the surrounding member 5 bent in the direction orthogonal to the airflow direction along the direction is, for example, 30 mm or less at both ends of the airflow direction. The filter pack 1 of the example shown in FIG. 4 is bent inward in a direction orthogonal to the airflow direction at both ends in the airflow direction.

It is preferable that the filter medium 3 has a pair of protrusions (not shown) provided so as to be in contact with each other by folding the filter medium 3 at a portion of the filter medium 3 forming adjacent pleats. The protrusions abut against each other to keep the pleated spacing uniform. The protrusions are provided on the filter medium 3 by, for example, embossing. For example, the protrusions are arranged so as to form a plurality of rows in a direction orthogonal to the extending direction of the crease 3a, and further, a plurality of rows of the protrusions are arranged so as to be spaced apart from each other in the extending direction of the crease 3a. Has been done. The protrusions are well known, and the arrangement, height, shape, etc. of the protrusions are defined as, for example, the "embossed protrusions" described in International Publication No. 2013/031229.

The filter medium 3 having such protrusions is folded so as to form a zigzag shape, and when a force for compressing in the Y direction is applied, the flat portion of the filter medium 3 surrounding the protrusions bends, thereby further Y. Easy to be compressed in the direction. That is, when the filter media 3 is folded, it is likely to be compressed so that the pleated spacing when the protrusions come into contact with each other is further narrowed. Therefore, it is possible to secure a large difference in the amount of displacement of the second fixed portions 5c and 5d between the time of compression and the time of expansion of the filter pack 1, and it is possible to efficiently remove the dust held by the filter medium 3.

On the other hand, the filter pack 1 may have a plurality of spacers (not shown) provided on the filter medium 3 in order to keep the pleated spacing uniform instead of the filter medium 3 having a plurality of protrusions. ..
The spacer is a linear member extending on both sides of the crease 3a in a direction orthogonal to the crease 3a on the surface of the filter medium 3 facing the outside of the pleats. The spacer is provided by applying a hot melt adhesive to the surface of the filter medium 3 and solidifying it.

It is preferable that the filter medium 3 is not provided with a reinforcing material that extends over the top of the pleats so as to extend in the Y direction. The reinforcing material is produced by using, for example, a hot melt adhesive. If such a reinforcing material is provided on the filter medium 3, it tends to be difficult for the filter pack 1 to be compressed or expanded in the Y direction.

The ratio (aspect ratio) of the length (vertical length) in the X direction to the length (horizontal length) in the Y direction of the filter pack 1 is the vertical length: horizontal length so as to increase the efficiency of removing dust held by the filter medium 3. However, for example, it is defined in the range of 3: 1 to 1: 3.

The dimensions of the filter pack 1 are not particularly limited, but the length in the X direction (vertical length) is, for example, 300 to 800 mm, the length in the Y direction (horizontal length) is, for example, 300 to 800 mm, and the length in the Z direction (Z direction). Depth) is, for example, 50 to 300 mm.

The number of pleats contained in the filter pack 1 is, for example, 50 to 200. The pleated spacing is, for example, 5-10 mm. The folding width of the filter medium 3 (distance between adjacent creases 3a) is 40 to 260 mm.

Next, the air filter of the present embodiment will be described.
As shown in FIG. 4, the air filter includes a filter pack 1 and a frame body 11.

The filter pack 1 is configured in the same manner as the filter pack 1 described above.

The frame body 11 is a member in which the filter pack 1 is housed. The filter pack 1 abuts on the inner wall surface of the frame 1 in a state of being housed in the frame 11. FIG. 5 shows an example of the frame body 11.
The frame body 11 has four frame side portions 4a, 4b, 4c, and 4d extending in a straight line. The frame side portions 4a to 4d are arranged so as to face the first fixing portions 5a and 5b and the second fixing portions 5c and 5d, respectively. The frame body 11 is manufactured by, for example, combining four frame members forming the frame side portions 4a to 4d. The frame material is made of, for example, a galvanized iron plate, a stainless steel plate, a resin, wood, or the like.

According to one embodiment, the frame 11 preferably has a flange 11e extending inward in a direction orthogonal to the airflow direction only at one end in the airflow direction. Thereby, for example, the filter pack 1 can be moved in the airflow direction from the side opposite to the airflow direction side where the flange 11e is provided and stored in the frame 11, and further, the flange 11e and the filter pack 1 can be stored. Can be brought into contact with each other to keep the space between the frame 11 and the filter pack 1 more airtight. In the frame 11 of the example shown in FIG. 4, the projection portion extending outward in the direction orthogonal to the airflow direction at the downstream end in the airflow direction is not shown.

In the air filter of the present embodiment, the Y direction of the second fixing portions 5c and 5d of the filter pack 1 follows the shape of the frame side portions 11c and 11d under the force of the filter medium 3 whose pleating interval is to be widened. It is deformed. That is, the second fixing portions 5c and 5d extend linearly without bending. In such an air filter, the second fixing portions 5c and 5d transmit the force of the filter medium 3 for which the pleating interval is to be widened to the inner wall surface of the frame body 11, so that the second fixing portion is flexible. Compared with the case of having no property, the effect of suppressing the gap between the second fixing portions 5c and 5d and the frame body 11 is large.

The frame body 11 is not limited to the illustrated form. The frame body 11 may be, for example, a duct provided in the building or a mounting frame provided in the air conditioning room.
The air filter of the present embodiment is preferably used in facilities such as factories, workplaces, and kitchens, and is preferably used in places where there is a large amount of dust floating in the air.

The filter pack and air filter of the present invention have been described in detail above, but the air filter and filter pack of the present invention are not limited to the above embodiments, and various improvements and changes are made without departing from the gist of the present invention. Of course, you may.

1 Filter pack 3 Filter material 3a Fold 6 Structure 6a Sheet 6b Rib 10 Air filter 11 Frame 11a, 11b, 11c, 11d Frame side 11e Flange

Claims (9)

It's a filter pack
A filter medium that collects fine particles in gas and is pleated,
A surrounding member that surrounds the filter medium so as to expose the folds of the pleats is provided.
The surrounding member
Two first fixing portions fixed to the filter medium so as to sandwich the filter medium from both sides in the extending direction of the fold.
It has two second fixing portions fixed to the filter medium so as to sandwich the filter medium from both sides in the extending direction of the fold and the direction orthogonal to the direction of the air flow passing through the filter medium.
When the filter pack is compressed or expanded in the orthogonal direction so that the adjacent spacing of the pleats changes, the displacement amount of the second fixing portion along the orthogonal direction is the displacement amount of the first fixing portion. The larger the portion of the second fixed portion away from the
The length of the filter pack along the orthogonal direction is such that the displacement amount of the second fixing portion at the first position in the direction parallel to the extending direction of the fold is larger than that of the first position. A filter pack characterized by being longer than a small second position. The filter pack according to claim 1, wherein the bending strength of the second fixing portion in the out-of-plane direction is 3.0 N / mm ^{2 or less.} Each of the fixing portions has a plate-shaped structural material and has a plate-like structural material.
The structural material is
Sheets facing each other and
The filter pack according to claim 1 or 2, wherein the filter pack has a plurality of ribs extending in one direction and arranged at intervals from each other, each having a plurality of ribs connecting the sheets. The filter pack according to claim 3, wherein in the second fixing portion, the rib extends in the extending direction of the fold. The filter pack according to claim 3 or 4, wherein in the first fixing portion, the rib extends in the orthogonal direction. The filter pack according to any one of claims 3 to 5, wherein the surrounding member further includes a covering member that covers the structural material. The one according to any one of claims 1 to 6, wherein the filter medium has a pair of protrusions provided on a portion of the filter medium forming adjacent pleats so that the filter media are folded so as to come into contact with each other. Filter pack. The filter pack according to any one of claims 1 to 7, wherein the filter medium is not provided with a reinforcing material extending over the top of the pleats so as to extend in the orthogonal direction. The filter pack according to any one of claims 1 to 8 and the filter pack.
A frame body in which the filter pack is housed and in contact with the filter pack is provided.
The frame body has four frame side portions arranged so as to face each of the first fixing portion and the second fixing portion.
The second fixing portion is an air filter characterized in that it is deformed along the shape of the frame side portion by receiving a force of the filter medium in which the adjacent intervals of the pleats are widened.

Images