JP6788463B2 - Air filter and manufacturing method of air filter - Google Patents

Description

The present invention relates to an air filter and a method for manufacturing the air filter.

An air filter is known in which a filter medium that collects fine particles in a gas is held by a frame. An air filter is generally made by combining a plurality of metal frame members in a rectangular shape so as to surround the filter medium.
As a conventional air filter, one having a connecting component connected to each of two adjacent frame members is known (Patent Document 1). The connecting component has a corner forming portion that forms a corner portion of the filter frame, and a fixing piece that extends from the corner forming portion and is joined to each frame plate. Further, a groove portion for sliding and inserting the fixing piece is formed on the inner wall of the metal frame plate having a U-shaped cross section. According to the air filter of Patent Document 1, it is said that the filter frame can be assembled with high accuracy in a small number of steps.

JP-A-2015-202488

In the air filter of Patent Document 1, since the filter frame and the outer peripheral edge portion of the filter medium are adhered and integrated, it is not necessary to fix the connecting parts to the frame plate. However, while handling the air filter, peeling may occur between the filter frame and the filter medium, and a part of the air filter may fall off.
On the other hand, Patent Document 1 describes that the frame plate and the connecting component are fixed to each other by using a fixing tool such as a rivet or a bolt / nut. However, when the fixture is used, the number of operations required for assembling the air filter increases, and care must be taken not to lose the fixture, which makes the work cumbersome.

An object of the present invention is to provide an air filter and a method for manufacturing an air filter, in which the frame members to be combined with each other are hard to come off and can be easily assembled.

One aspect of the present invention is an air filter.
A filter pack with a pleated filter medium that collects fine particles in the gas,
A resin frame that holds the filter pack so that the pleated folds of the filter medium are arranged on both sides in the airflow direction.
The frame body is composed of four frame members that are rectangularly combined so as to surround the filter pack, and the frame members are on both sides of the filter pack in a first direction that crosses the airflow direction, and the airflow. Placed on each side of the second direction, crossing the direction and orthogonal to the first direction, respectively.
The first frame member arranged on both sides in the first direction has a first locking portion which is a concave portion or a convex portion extending in the second direction.
The second frame members arranged on both sides of the second direction extend in the second direction and engage with the first locking portion in the second direction. Has a locking part
The filter pack is sandwiched between the first frame members arranged on both sides in the first direction in a state of being compressed in the first direction, and the first locking portion is held in the first locking portion. Press against the second locking portion that engages with the locking portion of one ,
The first frame material is characterized in that it is deformed so as to bulge in the first direction under the force of the compressed filter pack .
It is preferable that the first locking portions are provided at both ends of the first frame member in the second direction.

Another aspect of the present invention is an air filter.
A filter pack with a pleated filter medium that collects fine particles in the gas,
A resin frame that holds the filter pack so that the pleated folds of the filter medium are arranged on both sides in the airflow direction.
The frame is composed of four frame members that are rectangularly combined so as to surround the filter pack, and the frame members are on both sides of the filter pack in a first direction that crosses the air flow direction, and the air flow. Placed on each side of the second direction, crossing the direction and orthogonal to the first direction, respectively.
The first frame member arranged on both sides in the first direction has a first locking portion which is a concave portion or a convex portion extending in the second direction.
The second frame members arranged on both sides of the second direction extend in the second direction and engage with the first locking portion in the second direction. Has a locking part
The filter pack is sandwiched between the first frame members arranged on both sides in the first direction in a state of being compressed in the first direction, and the first locking portion is held in the first locking portion. Press against the second locking portion that engages with the locking portion of one,
The second frame member has a convex portion projecting toward the first frame member as the second locking portion.
The first frame material has a concave portion for receiving the convex portion as the first locking portion.
The recess is
A wall portion that contacts the convex portion in the first direction,
It is characterized by having a recessed space that is in contact with the wall portion and is open on the side opposite to the filter pack in the first direction.

It is preferable that the convex portion extends in the airflow direction, and the length in the airflow direction decreases toward the side of the first frame member.

The convex portion has a plate-like shape having surfaces facing both sides in the first direction, and the thickness in the first direction decreases toward the side of the first frame member. It is preferable to have a tip portion.

The first direction coincides with the direction in which the pleats of the filter medium are lined up.
The filter pack is further preferably located in the space between two adjacent pleats of the filter medium and having a spacer that holds the distance between the pleats.

It is preferable that the first frame member has ribs that protrude in the first direction and are provided so as to extend in the second direction.

Another aspect of the present invention is a method for manufacturing an air filter.
The step of pleating a filter medium sheet that collects fine particles in a gas to make a filter pack, and
A step of holding the filter pack in a resin frame is provided so that the pleated folds are arranged on both sides in the airflow direction.
The frame body is composed of four frame members that are rectangularly combined so as to surround the filter pack, and the frame members are on both sides of the filter pack in a first direction that crosses the airflow direction, and the airflow. Placed on each side of the second direction, crossing the direction and orthogonal to the first direction, respectively.
The first frame member arranged on both sides in the first direction has a first locking portion which is a concave portion or a convex portion extending in the second direction.
The second frame members arranged on both sides of the second direction extend in the second direction and engage with the first locking portion in the second direction. Has a locking part
In the holding step, the filter pack is sandwiched between the first frame members in a state of being compressed in the first direction, and the first locking portion is held by the first locking portion. Pressing against the second locking portion that engages with the first direction ,
In the air filter, the first frame member is under the force of compressed the filter pack, characterized that you have deformed to bulge in the first direction.

According to the present invention, it is possible to obtain an air filter and a method for manufacturing an air filter which can be easily assembled because the frame materials to be combined with each other are hard to come off.

It is an external perspective view which shows the air filter of this embodiment. It is a figure explaining the structure of a filter pack. It is an exploded perspective view which shows by disassembling a part of the air filter shown in FIG. It is a figure which shows the connecting member. It is a figure explaining the assembly of an air filter. It is a figure explaining the assembly of an air filter.

Hereinafter, the air filter of the present embodiment and the method for manufacturing the air filter will be described.

FIG. 1 is an external perspective view showing the air filter 1 of the present embodiment.
The air filter 1 includes a filter pack 70 and a frame body 2.

The filter pack 70 has a filter medium 50.
The filter medium 50 is a pleated member that collects fine particles in a gas.
As the filter medium 50, for example, a non-woven fabric or a woven fabric made of a fiber material of glass fiber or resin fiber is used. As a specific example of the filter medium 50, the collection efficiency for particles having a particle size of 0.3 μm is 90 to 99.99%, and the thickness is 0.4 to 0.9 mm. Such a filter medium conforms to a HEPA filter (a filter having a collection efficiency of 99.97% or more for particles having a particle size of 0.3 μm and an initial pressure loss of 245 Pa or less) or HEPA. It can be used as a performance filter (a filter having a collection efficiency of 90 to 99.99% for particles having a particle size of 0.3 μm).
The filter medium 50 is formed in a zigzag shape by alternately repeating mountain folding and valley folding of the filter medium sheet. Although not particularly limited, the outer dimensions of the filter medium 50 are, for example, 580 mm in length (length in Z direction) × 580 mm in width (length in Y direction) × 260 to 290 mm in depth (length in X direction). The pleated spacing of the filter medium 3 is 5 to 9 mm, the folding width is 260 mm, and the number of pleats is 60 to 100.

The filter pack 70 preferably further has a separator 60.
The separator 60 is a plurality of members arranged for each space between two adjacent pleats (mountain-folded mountain portions) of the filter medium 50. As the material of the separator 60, a metal such as aluminum or stainless steel, or paper is used. The separator 60 is a member that maintains the distance between the pleats (the distance along the Y direction in FIG. 1). The separator 60 is formed by being bent into a wavy shape, and is arranged so as to extend in a direction substantially parallel to the direction in which the folds of the pleats extend (Z direction in FIG. 1). As shown in FIG. 2, the separator 60 preferably has the above-mentioned wave shape so that the length in the lateral direction (Y direction) gradually changes in the airflow direction (X direction in FIG. 1). FIG. 2 is a diagram for explaining the structure of the filter pack 70, and shows a cut surface of the filter pack 70 orthogonal to the vertical direction (Z direction). In FIG. 2, the separator 60 is shown by the outline of its outer shape.
It is preferable that the filter media 50 are located at both ends of the filter pack 70 in the first direction.

The frame body 2 is a resin member that holds the filter pack 70. The frame 2 is made of, for example, a resin material such as ABS resin, polypropylene, polystyrene, polycarbonate, or polyphthalamide.
The frame body 2 holds the filter pack 70 so that the pleats of the filter medium 50 are arranged on both sides in the airflow direction (X direction). The frame body 2 is composed of four frame members 10, 10, 30, and 30 that are rectangularly combined so as to surround the filter pack 70.
Of these, the two frame members 30 (first frame members) are arranged on both sides of the filter pack 70 in the first direction (Y direction) that crosses the airflow direction. The first frame member 30 has a first locking portion (for example, a concave portion 34 described later) which is a concave portion or a convex portion extending in the second direction.
Further, the two frame members 10 (second frame members) are arranged on both sides of the second direction (Z direction) that crosses the airflow direction and is orthogonal to the first direction. As will be described later, the second frame member 10 is composed of a frame body 20 and connecting members 40 joined to both ends thereof. The second frame member 10 has a second locking portion (for example, a claw 42 described later) that extends in the second direction and engages with the first locking portion in the second direction. doing.

In the air filter 1, the filter pack 70 is sandwiched between the frame members 30 in a state of being compressed in the first direction. Specifically, in the filter pack 70, the length in the first direction is the length in the first direction of the space inside the frame body 2 (also referred to as the filter medium input portion), that is, the two first frame members. It is larger than the distance of 30 in the first direction (more specifically, the distance between the inner surfaces of the wall portions 31 facing each other). Further, since the filter pack 70 is manufactured by arranging the separator 60 so as to press it against the filter medium 50 in the first direction when it is arranged in the space between the pleats of the filter medium 50, the separator 60 is formed. As a repulsive force, there is an inherent force that tries to spread to the outside in the first direction. As a result, the filter pack 70 is held in the frame body 2 in a compressed state in the first direction. Therefore, the first frame member 30 is located on the side opposite to the side to be compressed (hereinafter, also referred to as the inside of the first direction) (hereinafter, the outside of the first direction) in the first direction from the filter pack 70. Also called) is receiving a reaction force. Since the first frame member 30 is made of resin, it is deformed so as to bulge outward in the first direction by receiving the reaction force of the filter pack 70, and the first locking portion is the first locking portion. It is pressed outward in the first direction with respect to the second locking portion that engages with the portion. Therefore, friction is generated between the first locking portion and the second locking portion, and the first frame member 30 and the second frame member 10 are hard to come off from each other. In this way, in the frame body 2, the first locking portion and the second locking portion are engaged in the second direction, and the first locking portion and the second locking portion are engaged with each other. It is hard to come off due to the friction between them. Therefore, the air filter 1 can be easily assembled without using fixtures such as rivets and bolts / nuts.

On the other hand, in the air filter of Patent Document 1, the metal frame plate does not deform so as to bend in the direction orthogonal to the extending direction, and the groove portion of the frame plate that engages with each other along the extending direction. There is no friction between the and the fixed piece of the connecting component. Therefore, while handling the air filter, a part of the air filter may come off from the other part due to its own weight and fall off. For example, when grasping the upper side of the filter frame, the side frame plate slides away from the connecting parts on the upper side due to the part forming the side and bottom of the filter frame and the weight of the filter medium surrounded by these. May be done. In this case, if peeling occurs between the filter medium adhered to the upper side and the frame plate, the frame plate on the side side slides further with respect to the connecting parts on the upper side, and the portion forming the side side and the bottom side of the filter frame and The filter medium may fall off.

Hereinafter, the engagement between the first frame member 30 and the second frame member 10 will be described more specifically.
In the air filter 1 shown in FIG. 1, the second frame member 10 extends over a range of the first direction (X direction) facing the first frame member 30 in the second direction (Y direction). ing. Further, as shown in FIG. 3, the second frame member 10 has a claw 42 protruding toward the first frame member 30 as a second locking portion at a position facing the first frame member 30. It has a (convex part). FIG. 3 is an exploded perspective view showing a part of the air filter 1 in an exploded manner. In the example shown in FIG. 3, a plurality of claws 42 are provided along the airflow direction. Further, the first frame member 30 has a recess 34 for receiving the claw 42 as a first locking portion at a position facing the second frame member 10.

The recess 34 has a wall portion 31 and a recess space 33.
The wall portion 31 is a portion that comes into contact with the claw 42 in the first direction. In the example shown in FIG. 3, the wall portion 31 is a portion extending in a plate shape in the second direction, abuts on the filter pack 70 on the inside in the first direction, and the claw 42 on the outside in the first direction. Contact with. The wall portion 31 and the claw 42 that are pressed against each other by the filter pack 70 are in surface contact with each other.
The recessed space 33 is a space open to the outside of the wall portion 31 in the first direction. Since the recessed space 33 is open to the outside in the first direction, for example, when assembling the air filter 1, it is necessary to accurately align the position of the claw 42 with the specific position of the first frame member 30. Absent. Therefore, as compared with the case where the fixing piece of the connecting part is inserted into the groove of the frame plate and the connecting part and the frame plate are fitted to each other as in Patent Document 1, the workability is good and the assembly of the air filter 1 is easy. is there. The length of the recessed space 33 in the first direction is thicker than the thickness of the claw 42, and is, for example, twice the thickness of the claw 42.

It is preferable that the claws 42 extend in the airflow direction, and the length in the airflow direction becomes shorter toward the side of the first frame member 30 (downward in FIG. 1). In the example shown in FIG. 4A, the claws 42 have both ends cut off in the airflow direction. FIG. 4A is a diagram showing the connecting member 40 constituting the second frame member 10 when viewed in the Y direction. As a result, as will be described later, the air filter 1 is assembled by rotating the filter pack assembly (described later) with the edge of the second frame member 10 forming the bottom plate of the air filter 1 as the center of rotation. Can be done. In the example shown in FIG. 4A, the claw 42 is formed in a shape along a certain radius of curvature, but is not limited to such a shape. Such a cornered shape is formed in all the regions where the claws 42 extend in the Z direction or in a part of the region on the distal end side.

The claw 42 has a plate-like shape having surfaces facing both sides in the first direction, and the thickness in the first direction becomes smaller toward the side of the first frame member 30 in the air filter 1. It is preferable to have the tip portion 42a. The claw 42 has a tapered tip 42a in the example shown in FIG. 4 (b). FIG. 4B is a view showing the connecting member 40 as viewed in the X direction. As a result, even when the claw 42 is thick, the claw 42 can be more easily inserted into the recessed space 33 when the air filter 1 is assembled. In the example shown in FIG. 4B, the tip portion 42a has a form in which only one side in the thickness direction is scraped off, but a form in which both sides in the thickness direction are scraped off may be adopted. Further, such a tapered claw 42 portion may be formed not only in the tip portion 42a but also in the entire region where the claw 42 extends in the Z direction.

The connecting member 40 further has a claw 41 as shown in FIGS. 4 (a) and 4 (b). The claw 41 is configured in the same manner as the claw 42, for example. The claw 41 is arranged so as to abut from the outside in the second direction with respect to the wall portion 21 (described later) of the frame body 20 when the connecting member 40 and the frame body 20 are joined.

The first frame member 30 further preferably has ribs 32, as shown in FIG. The rib 32 is a portion provided so as to project outward from the wall portion 31 in the first direction and extend in the second direction. In the example shown in FIG. 3, two ribs 32 are provided, but the number thereof is not limited, and for example, one or three or more ribs 32 are provided depending on the number of claws 42. Depending on its size and shape, the frame material may be significantly deformed by receiving a force from the filter pack. As a result, if there is a gap between the filter pack and the frame material, a leak may occur. In the air filter 1, since the rib 32 is provided on the wall portion 31, the bending rigidity of the first frame member 30 along the first direction is increased, and even if a force is received from the filter pack 70, the first frame member 30 has a bending rigidity. It is possible to prevent the amount of deformation of the frame member 30 in 1 in the first direction from becoming too large. Further, the distance between the rib 32 and the side wall (wall surface at the end in the airflow direction) of the first frame member 30 or between the ribs 32 is substantially equal to the length of the claw 42 along the airflow direction. Is preferably open. As a result, the claw 42 is positioned in the airflow direction in a state of being engaged with the first frame member 30.

The frame body 20 constituting the second frame member 10 has a cross-sectional shape shown in the longitudinal direction thereof, for example, which is the same as the cross-sectional shape of the first frame member 30. In this case, the frame body 20 has a wall portion 21 and a rib 22 as shown in FIG. The wall portion 21 extends in the first direction and supports the filter pack 70 in the second direction. The rib 22 is provided so as to project outward from the wall portion 21 in the second direction and extend in the first direction. As in the example shown in FIG. 3, the frame main body 20 may or may not have a space open to the outside in the second direction of the wall portion 21 and may not have such a space. For example, the frame body 20 and the connecting member 40 may be configured to be joined by a fitting type.

Instead of the above-described form, in the air filter 1, for example, the claw 42 may be provided in the first frame member 30, and the recessed space 33 may be provided in the second frame member 10. In this case, the claws of the first frame member 30 are pressed by the filter pack 70 against the wall portion that defines the concave space of the second frame member 10 to the outside in the first direction.
Further, the filter pack 70 may not have the separator 60. In this case, the filter medium 50 is maintained at the pleated spacing by a known spacer formed of a hot melt resin or a known embossed protrusion provided on the filter medium 50 itself.
Further, the filter pack 70 may be sandwiched between the first frame members 30 so that the direction in which the folds of the pleats of the filter medium 50 extend coincides with the first direction. In this case, the dimensions of the filter pack 70 in the first direction are determined so that the pleats of the filter medium 50 do not bend.

According to the above air filter 1, the filter pack 70 is sandwiched between the first frame members 30 in a compressed state, and the first locking portion is pressed against the second locking portion. As a result, the resin-made first frame member 30 is deformed so as to bend outward in the first direction, and friction is generated between the first locking portion and the second locking portion. Therefore, the first frame member 30 and the second frame member 10 are hard to come off from each other. In the air filter 1, the first frame member 30 and the second frame member 10 are engaged in the second direction, and the first frame member 30 and the second frame member 10 are hard to come off from each other. , Easy to assemble without using fixtures such as rivets.

The air filter 1 is used, for example, as an air filter for purifying the air supplied to the gas turbine. Further, the air filter 1 is installed, for example, in the outside air intake of a building, in the middle of a duct, or the like, and is used as an air filter for purifying the air supplied to the downstream side from these places.

Next, a method of manufacturing the air filter of the present embodiment will be described.
The present manufacturing method includes a step of producing a filter pack and a step of holding the filter pack.
In the step of producing the filter pack, the filter medium sheet that collects the fine particles in the gas is pleated. In this step, for example, the filter pack 70 is made.
In the step of holding the filter pack, the filter pack is held by a resin frame so that the pleated folds are arranged on both sides in the airflow direction. As the frame body, for example, the frame body 2 is used. In the step of holding the filter pack, the filter pack 70 is sandwiched between the first frame members 30 in a compressed state in the first direction, and the first locking portion is combined with the first locking portion. Press against the second locking portion to be engaged.

Prior to assembling the air filter 1, the second frame member 10 is manufactured in advance. The frame body 20 and the connecting member 40 are joined by, for example, fusion. The fusion is performed by heating and melting at least one of the surfaces of the claw 41 and the wall portion 21 in contact with each other and superimposing them on each other. In this respect, the resin used as the constituent material of the frame body 2 is preferably a thermoplastic resin.

Hereinafter, a specific example of a method of holding the filter pack 70 using the frame body 2 will be described with reference to FIGS. 5 and 6. 5 and 6 are views for explaining the assembly of the air filter 1.
In this specific example, first, the second frame member 10 forming the lower side of the air filter 1 is placed with the claws 42 facing upward. For example, a urethane resin sealant is applied to the upper surface of the wall portion 21.
On the other hand, the filter pack 70 is sandwiched between the first frame members 30 from both sides in the first direction and compressed inward in the first direction as shown by the horizontal arrows in FIG. 5, and the filter pack assembly 80 is used. To make. The amount of compression at this time is, for example, an amount in which the length of the filter pack 70 in the first direction is slightly shorter than the length of the filter medium charging portion in the first direction, for example, in the range of more than 0 mm and 1 mm or less. is there. The filter pack 70 and the first frame member 30 are fixed by being line-bonded with an adhesive. Line bonding is bonding along the direction in which the folds of the pleats extend (Z direction).

Next, the filter pack assembly 80 is positioned in the first direction with respect to the second frame member 10 placed above, and as shown in FIG. 6, the end of the second frame member 10 in the airflow direction. Is temporarily fixed so as to rotate around the edge extending in the first direction as the rotation center. In this state, while confirming that the claw 42 of the second frame member 10 enters the recessed space 33 of the first frame member 30 of the filter pack assembly 80, the filter pack is shown by an arrow in FIG. The assembly 80 is rotated to place the claw 42 in the recessed space 33 and bring the filter pack 70 into contact with the sealing material. Once the filter pack 70 is brought into contact with the sealing material, the filter pack assembly 80 cannot be separated from the second frame member 10, so that the filter pack assembly 80 is tentatively placed on the second frame member 10 with respect to the second frame member 10. If they are adhered in a state of being displaced in the direction of 1, the distortion will cause a problem in the performance of the air filter 1. In the present manufacturing method, the filter pack assembly 80 is rotated with respect to the second frame member 10 as described above, so that the filter pack assembly 80 is accurately positioned with respect to the second frame member 10. can do.

Next, the second frame member 10 forming the upper side of the air filter 1 is coated with, for example, a urethane resin sealing material on the surface of the wall portion 21 facing downward, and then the claws 42 are directed downward to the filter pack assembly 80. The filter pack 70 is placed in the recessed space 33 of the first frame member 30 and brought into contact with the sealing material. As described above, the air filter 1 is assembled.

According to this manufacturing method, the air filter 1 can be easily assembled without using a fixture such as a rivet. Then, in the air filter 1 assembled by the present manufacturing method, as described above, the first locking portion and the second locking portion are engaged with each other, and the first locking portion and the second locking portion are engaged with each other. Since friction is generated between the first frame member 30 and the second frame member 10, the first frame member 30 and the second frame member 10 are hard to come off from each other.

Although the air filter of the present invention and the method for manufacturing the air filter have been described in detail above, the air filter of the present invention and the method for manufacturing the air filter are not limited to the above embodiments and do not deviate from the gist of the present invention. Of course, various improvements and changes may be made in.

1 Air filter 2 Frame body 10 Second frame material 20 Frame body 21 Wall part 22 Rib 30 First frame material 31 Wall part 32 Rib 33 Recessed space 34 Recessed space 34 Recessed member 42 Claw (convex part)
50 Filter media 60 Separator 70 Filter pack

Claims (8)

A filter pack with a pleated filter medium that collects fine particles in the gas,
A resin frame that holds the filter pack so that the pleated folds of the filter medium are arranged on both sides in the airflow direction.
The frame is composed of four frame members that are rectangularly combined so as to surround the filter pack, and the frame members are on both sides of the filter pack in a first direction that crosses the air flow direction, and the air flow. Placed on each side of the second direction, crossing the direction and orthogonal to the first direction, respectively.
The first frame member arranged on both sides in the first direction has a first locking portion which is a concave portion or a convex portion extending in the second direction.
The second frame members arranged on both sides of the second direction extend in the second direction and engage with the first locking portion in the second direction. Has a locking part
The filter pack is sandwiched between the first frame members arranged on both sides in the first direction in a state of being compressed in the first direction, and the first locking portion is held in the first locking portion. Press against the second locking portion that engages with the locking portion of one ,
The air filter is characterized in that the first frame material is deformed so as to swell in the first direction by receiving the force of the compressed filter pack . A filter pack with a pleated filter medium that collects fine particles in the gas,
A resin frame that holds the filter pack so that the pleated folds of the filter medium are arranged on both sides in the airflow direction.
The frame body is composed of four frame members that are rectangularly combined so as to surround the filter pack, and the frame members are on both sides of the filter pack in a first direction that crosses the airflow direction, and the airflow. Placed on each side of the second direction, crossing the direction and orthogonal to the first direction, respectively.
The first frame member arranged on both sides in the first direction has a first locking portion which is a concave portion or a convex portion extending in the second direction.
The second frame members arranged on both sides of the second direction extend in the second direction and engage with the first locking portion in the second direction. Has a locking part
The filter pack is sandwiched between the first frame members arranged on both sides in the first direction in a state of being compressed in the first direction, and the first locking portion is held in the first locking portion. Press against the second locking portion that engages with the locking portion of one,
The second frame material has a convex portion protruding toward the first frame material as the second locking portion.
The first frame material has a concave portion for receiving the convex portion as the first locking portion.
The recess is
A wall portion that contacts the convex portion in the first direction,
An air filter that is in contact with the wall portion and has a recessed space that is open on the side opposite to the filter pack in the first direction. The air filter according to claim 2, wherein the convex portion extends in the airflow direction, and the length in the airflow direction decreases toward the side of the first frame member. The convex portion has a plate-like shape having surfaces facing both sides in the first direction, and the thickness in the first direction decreases toward the side of the first frame member. The air filter according to claim 2 or 3, which has a tip portion. The first direction coincides with the direction in which the pleats of the filter medium are lined up.
The air filter according to any one of claims 1 to 4, wherein the filter pack is further arranged in a space between two adjacent pleats of the filter medium and has a spacer for holding a space between the pleats. .. The air according to any one of claims 1 to 5, wherein the first frame member has ribs protruding in the first direction and extending in the second direction. filter. The air filter according to any one of claims 1 to 6, wherein the first locking portion is provided at both ends of the first frame member in the second direction. It is a manufacturing method of an air filter.
The step of pleating a filter medium sheet that collects fine particles in a gas to make a filter pack, and
A step of holding the filter pack in a resin frame is provided so that the pleated folds are arranged on both sides in the airflow direction.
The frame is composed of four frame members that are rectangularly combined so as to surround the filter pack, and the frame members are on both sides of the filter pack in a first direction that crosses the air flow direction, and the air flow. Placed on each side of the second direction, crossing the direction and orthogonal to the first direction, respectively.
The first frame member arranged on both sides in the first direction has a first locking portion which is a concave portion or a convex portion extending in the second direction.
The second frame members arranged on both sides of the second direction extend in the second direction and engage with the first locking portion in the second direction. Has a locking part
In the holding step, the filter pack is sandwiched between the first frame members in a state of being compressed in the first direction, and the first locking portion is held by the first locking portion. Pressing against the second locking portion that engages with the first direction ,
Wherein the air filter, the first frame member is compressed method for manufacturing an air filter, wherein said Rukoto been deformed by a force of the filter pack in the first direction to swell like.

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