JP2020146640A - Air filter - Google Patents

Abstract

To provide an air filter formed such that a filter presser can be fixed in a filter frame easily and securely.SOLUTION: An air filter comprises: a filter frame 22 mounted in an intake port 12 of a filter unit 10; a filter material 16a attached to the filter frame 22; and a filter presser 24 that holds the filter material 16a in the filter frame 22. The filter frame 22 is formed in the form of an outer shape of the intake port 12 in combination with a U-shaped cross-sectional member. The filter presser 24 is formed from a rod member 24a so as to have a frame shape. The maximum opposite intervals of the frame formed from the rod member 24a is wider than the interval between opposite open edges 22a of the filer frame 22. The flat shape of the filter presser 24 is formed so as to fit in a flat surface defined by the open edges 22a of the filter frame 22.SELECTED DRAWING: Figure 1

Description

The present invention relates to a clean room for cell culture applications in pharmaceutical factories and regenerative medicine, an industrial clean room such as a semiconductor factory, and an air filter provided at an intake port of other air conditioning equipment.

Conventionally, working environments in fields that require a clean environment, such as the pharmaceutical and bio-industries, and precision machinery such as semiconductors and optical instruments, have been performed in a clean room in which dust in the air is almost completely removed. An air filter that removes various dust and other impurities inside the air conditioner's intake port (exhaust port and return air port) in this clean room because it dislikes the movement of dust and impurities to other rooms and the outside. The filter unit is installed and the filter unit is connected to the intake / exhaust duct.

In particular, as a structure of the pre-filter attached to the intake port of the filter unit, for example, as disclosed in Patent Document 1, a filter material is attached to the filter frame, and a filter holder made of a metal wire is used to prevent the filter material from coming off. Is attached to the filter frame. A plurality of filter retainers extend obliquely and abut against the four sides of the filter frame and engage with the front edge of the filter frame to prevent the filter material from coming off the intake port. When attaching and detaching the filter retainer to and from the filter frame, the filter retainer is elastically deformed so as to be inside the edge of the filter frame, and then attached and detached. In addition, Patent Document 2 has a filter holder assembled in the shape of a rice paddy, and one side of the filter holder in the shape of a rice field is locked to the filter frame side, so that the filter holder is locked and released. When doing so, one side of the filter retainer is elastically deformed to lock and unlock.

Further, as disclosed in Patent Document 3, a U-shaped spring material having both ends pivotally supported on one side of the filter frame so as to be rotatable in a direction intersecting the filter surface is provided. There is also a structure in which the filter material is attached to the filter frame, the U-shaped spring material is rotated, and the U-shaped central convex end is engaged with and held by the other spring retainer of the filter frame. Proposed. The spring material is elastically deformed during the engagement operation. Assuming that the filter retainer is mounted by rotating in a direction intersecting the filter surface, a pair of V-shaped filter retainers are arranged symmetrically with each other as in the filter retainer disclosed in Patent Document 4. In some cases, both ends of the V-shape are pivotally supported on the opposite sides of the filter frame. Then, the pair of filter holders are rotated so as to intersect each other, and the ends of the V-shaped vertices are held on the sides facing each other to hold the filter material. Even with this structure, the V-shaped filter retainer is elastically deformed when the filter retainer is engaged.

In addition, as disclosed in Patent Document 5, a pair of V-shaped fence-shaped bodies are arranged symmetrically with each other, pressed by a frame-shaped pressing member, and sandwiched between the outer frame and the outer frame. Some hold and secure the filter material to the filter frame.

Jikkenhei 3-56613 Gazette Utility Model Registration No. 3092470 Gazette No. 42-4471 Japanese Unexamined Patent Publication No. 2005-103356 Japanese Unexamined Patent Publication No. 2011-230057

As disclosed in the above-mentioned conventional patent documents 1 and 2, a filter holder that is elastically deformed and mounted on a filter frame may be plastically deformed if the elastic deformation at the time of mounting is excessive, and the plastic deformation may occur. As a result, the engaging portion of the filter retainer may not reach the engaging position. Further, if the suction force of the air conditioner is strong, the filter retainer may be elastically deformed and plastically deformed in that shape.

Similarly, as disclosed in Patent Documents 3 and 4, even in the case of a structure in which the filter retainer is rotated and attached when the filter retainer is attached, it is necessary to elastically deform the filter retainer when it is locked to the filter frame. There is an adverse effect due to the above-mentioned plastic deformation. Further, a structure for providing the rotation shaft of the filter holder is required, which increases the man-hours in manufacturing and is costly.

Further, in the case of the structure for sandwiching the filter retainer disclosed in Patent Document 5, there is a problem that a frame-shaped pressing member for sandwiching is required, and the cost increases and the mounting man-hours increase due to the increase in the number of members.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide an air filter formed so that a filter retainer can be easily and surely fixed to a filter frame.

The present invention is an air filter attached to the intake port of a filter unit provided with an intake port for sucking air, the filter frame attached to the intake port, and a single-wafer-shaped filter material attached to the filter frame. And a filter retainer for holding the filter material in the filter frame, the filter frame is formed in the outer shape of the intake port by assembling members having a U-shaped cross section, and the filter retainer is a rod. The filter material is held in the filter frame by being formed in a frame shape by the members and entering the gap between the filter frame and the filter material, and the maximum distance between the frames by the rod members facing each other is the maximum distance between the filter frames. The flat shape of the filter retainer, which is wider than the distance between the opening edges facing each other, is an air filter having a shape that fits within the plane formed by the opening edges of the filter frame.

The maximum distance between the rod members and the opposing portions of the frames is formed to be narrower than the distance between the opposite groove bottoms of the filter frame.

Further, the intake port is quadrangular, the filter frame is formed in a quadrangular frame, the filter retainer is formed in a rhombus shape by the rod member, and the length of one diagonal line of the rhombus is the length of the filter frame. The length is longer than the long side of the opening edge and narrower than the distance between the opposite groove bottoms of the filter frame.

Further, the length of the other diagonal line of the rhombus is formed to be longer than the short side of the opening edge of the filter frame and narrower than the distance between the groove bottoms located on the long side of the filter frame. Is what you are doing.

Further, in the diamond-shaped filter retainer, it is preferable that the rod members are arranged diagonally as well, and the intersecting rod members are fixed to each other at positions where the diagonal lines intersect with each other.

In the air filter of the present invention, the filter material is attached to the filter frame, the filter retainer is inserted so as to be pressed against the filter material through the opening of the filter frame, and the filter retainer is slightly rotated in the surface direction of the filter material. By moving it, the filter retainer can be easily and surely engaged with the filter frame to hold the filter material. Moreover, the filter retainer can be locked to the filter frame without being deformed. As a result, the life of the filter retainer is extended, and it is not necessary to elastically deform the filter retainer. Therefore, the filter retainer can be formed by a member having a good appearance.

It is a schematic front view of the filter unit which attached the air filter of one Embodiment of this invention. It is a schematic side view of the filter unit which attached the air filter of one Embodiment of this invention. It is an enlarged front view of the air filter of the filter unit which attached the air filter of one Embodiment of this invention. It is a partially enlarged sectional view of the air filter of one Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the air filter of this embodiment is used indoors in a filter unit 10 of an air conditioner provided in a clean room of a research facility such as a pharmaceutical industry such as pharmaceuticals and a bio-industry such as regenerative medicine or a factory. It is attached to an intake port 12 that sucks in air.

The filter unit 10 is connected to an air conditioner (not shown) by cutting off a part of the wall material forming a room in a clean room of a pharmaceutical factory or the like, standing vertically at a predetermined position so as to be incorporated in the wall. , The air in the room can be sucked by a fan (not shown). As shown in FIG. 2, the board wall material and the sandwich panel wall material 30 are cut out according to the outer dimensions of the filter unit 10, and the floor is angle-shaped, and the lining is rotated in a frame shape by a channel-shaped lining steel material 31 to form a wall. The gap between the material 30 and the filter unit 10 is caulked with a caulking material together with a backup material.

As shown in FIGS. 1 and 2, the filter unit 10 is formed in a rectangular parallelepiped tubular shape, and the hollow interior is an air passage, and a plurality of HEPA filters 14 can be exchanged in multiple stages so as to block the air passage. It is attached to. As a result, the foreign matter that causes contamination and should not be mixed in the air flow toward the duct connection port formed by the short pipe flange provided on the upper part of the filter unit 10 is finally removed. The reason why the HEPA filter 14 is installed in multiple stages is that one is always left in the filter unit 10 in order to avoid communicating with the outside without passing through the HEPA filter 14 even at the time of cleaning or replacement.

An intake port 12 is located below the HEPA filter 14 of the filter unit 10. The intake port 12 of the filter unit 10 is provided on the front surface 10a of the filter unit 10, is located near the floor F in the room, and is provided so as to be able to suck air above the floor F. Further, an air filter 16 which is a pre-filter for removing relatively large dust and impurities in the air before being sent to the HEPA filter 14 is attached to the intake port 12 of the front surface 10a of the filter unit 10.

The air filter 16 of this embodiment is continuous with the front peripheral edge portion 12a of the intake port 12, which is the front surface 10a of the filter unit 10, and the square edge portion 12b bent inward from the entire circumference of the front peripheral edge portion 12a. Further, by folding at a right angle to the inside of the center side of the intake port 12, it is attached to the stepped portion 18 recessed on the inner 10b side of the filter unit 10. The front peripheral edge portion 12a is cut out from the lower part of the front plate of the filter unit 10 to an area defined by the surface speed of the intake air flow, and is formed in a quadrangular shape. The stepped portion 18 has an L-shaped cross section formed on the entire circumference of the front peripheral edge portion 12a, and is formed in an L-shaped cross section continuously from the front surface 10a of the filter unit 10. The size of the front peripheral edge portion 12a of the intake port 12 is determined from the viewpoint of dust removal performance by the air filter and prevention of wind noise, depending on the surface speed obtained by dividing the airflow velocity by the area including the air filter filter medium and the filter frame which are resistors. Is regulated. Of the stepped portions 18 continuous to the front peripheral edge portion 12a, a weir or water that blocks the flow of water while forming a gradient (water gradient) through which water flows toward the lower peripheral edge stepped portion 18a located below. The bottom plate 20 provided at the bottom of the filter unit 10 is continuously connected without forming a groove shape in which the filter unit 10 accumulates. The bottom plate 20 is inclined in a downward direction toward the front opening edge portion 12a so that the cleaning liquid can be easily discharged when cleaning the filter unit 10 described later. The other inner edge of the stepped portion 18 is continuous with the inner wall surface which is the inner surface 10b of the filter unit 10.

As shown in FIG. 4, the air filter 16 is a filter frame 22 in which a frame material made of stainless steel or the like is assembled in a rectangular shape, in which a thick felt-like and single-wafer-shaped filter material 16a such as a non-woven fabric is attached. is there. The filter frame 22 is formed by assembling a frame material having a U-shaped cross section into a rectangular shape, and the external dimensions of the filter frame 22 are substantially the same as the internal dimensions of the stepped portion 18 of the front peripheral edge portion 12a of the intake port 12. It is the same but slightly smaller in size and is formed in a size that can be fitted to the stepped portion 18. A diamond-shaped filter retainer 24 made of a metal wire is inserted into a gap between the filter frame 22 and the filter material 16a and is detachably attached to the filter frame 22 to hold the filter material 16a in the filter frame 22.

As shown in the figure, the filter retainer 24 has a rhombus shape formed by cutting a material such as a stainless steel rod or a stainless steel wire, which has lower flexibility and plasticity than ordinary steel and is excellent in shape retention, to a predetermined length. It is formed in the shape of a frame. The lengths of the two diagonal lines of the rhombus are different from each other when the filter frame 22 is rectangular, and are equal when the filter frame 22 is square. The longer of the two diagonals is longer than the long side of the opening edge 22a of the filter frame 22 and narrower than the distance between the opposing groove bottoms 22b of the short side of the filter frame 22. It is formed. The shorter of the two diagonal lines of the rhombus is longer than the short side of the opening edge 22a of the filter frame 22 and narrower than the distance between the opposite groove bottoms 22b of the long side of the filter frame 22. It is formed in a rhombus. Therefore, the plane shape of the rhombus-forming surface of the filter retainer 24 has a shape that can be completely entered into the plane formed by the opening edge 22a of the filter frame 22 as shown in FIG. 3 by adjusting the orientation. The shape is such that the end portion can be engaged with the inside of the opening edge 22a of the filter frame 22. Further, in the diamond-shaped filter retainer 24, the rod members 24a are also arranged on the two diagonal lines, and the intersecting rod members 24a are welded or brazed to each other at the corners and the positions where the diagonal lines intersect with each other. It is fixed.

As shown in FIGS. 1 and 2, locking members 26 for holding the peripheral edge of the air filter 16 are provided on the front peripheral edge 12a at predetermined plurality of positions on all four sides. For example, as shown in FIG. 1, one locking member 26 is provided on each of the upper side facing the lower peripheral edge step portion 18a of the step portion 18 and the sides on both sides thereof. The locking member 26 is a mounting shaft member 26a that is pivotally supported by the front peripheral edge portion 12a and has a rotated portion on the head, and a plate-shaped locking plate that is rotatably mounted through the mounting shaft member 26a. It consists of 26b. The locking plate 26b of the locking member 26 is in contact with the front surface of the air filter 16 in a state where the air filter 16 is attached to the stepped portion 18, and the position where the air filter 12 is held by the stepped portion 18 and the air filter 16 It is rotatably provided around the mounting shaft member 26a so that a retracted position away from the contact position of the can be selected. Further, the locking plate 26b is formed so as to press the filter frame 22 of the air filter 16 in a state of being rotated toward the air filter 16 so that the air filter 16 is pressed against the inner surface of the step portion 18.

Next, the method of attaching the air filter 16 of this embodiment will be described below. First, in the attachment of the filter retainer 24 of the air filter 16 of this embodiment, the filter material 16a is attached to the filter frame 22, and the filter retainer 24 is attached to the filter material 16a from the opening inside the opening edge 22a of the filter frame 22. It is inserted into the gap between the inner surface of the opening edge 22a and the filter material 16a so as to be pressed. When the filter retainer 24 is inserted while widening the gap between the inner surface of the opening edge 22a and the filter material 16a, the thickness of the filter material 16a is compressed by the rod member 24a and tends to return, and the opening edge 22a expanded by the rod member 24a. A strong static friction force is generated by the closing force of the frame material, and the opening edge 22a, the rod member 24a, and the filter material 16a are held in close contact with each other. As shown in FIG. 3, the planar shape of the filter retainer 24 is a shape that fits within the plane formed by the opening edge 22a of the filter frame 22, so that when inserting the filter retainer 24, the diagonal direction of the filter retainer 24 is changed. Insert it by arranging it at a slight angle so as to face the corner of the filter frame 22. By tilting the direction of the filter retainer 24, as shown in FIG. 3, the shape of the filter retainer 24 on the filter material 16a in the filter frame 22 enters the inside of each opening edge 22a of the filter frame 22. The filter retainer 24 can be reliably arranged on the filter material 16a. In this state, the filter retainer 24 is further pressed in the thickness direction of the filter material 16a, and the filter retainer 24 is inside the filter frame 22 and the corner portion of the filter retainer 24 faces the groove bottom portion 22b of the filter frame 22. The filter retainer 24 is slightly rotated in the plane direction on the surface of the filter material 16a. The rotation direction is such that the apex of the diamond-shaped corner of the filter retainer 24 is rotated from the inside of the opening edge 22a of the filter frame 22 toward the groove bottom portion 22b. As a result, as shown in FIG. 4, the apex of the filter retainer 24 is located inside the filter frame 22 having a U-shaped cross section, and the filter retainer 24 holds the filter material 16a.

Further, in the attachment of the air filter 16 of this embodiment to the filter unit 10, the surface of the air filter 16 is directed toward the front surface 10a with respect to the stepped portion 18 formed at the intake port 12 of the front surface 10a of the filter unit 10. It is attached by pushing it in while keeping it parallel, and fixing the locking plate 26b of the locking member 26 by rotating it from the retracted position toward the air filter 16. Further, the air filter 16 can be easily removed by the reverse operation of the above. The filter 16 can be easily attached and detached, and the inside 10b of the filter unit 10 can be easily cleaned and the HEPA filter 14 can be easily replaced.

According to the air filter 16 of this embodiment, the filter material 16a is attached to the filter frame 22, the filter retainer 24 is inserted so as to be pressed against the filter material 16a through the opening of the filter frame 22, and the filter retainer 24 is inserted into the filter material. By slightly rotating the filter material 16a on the surface of the 16a, the filter material 16a can be easily and surely held by the filter frame 22. Further, the fixing can be completed without deforming the filter retainer 24. As a result, the life of the filter retainer 24 is extended and it is not necessary to elastically deform the filter retainer 24. Therefore, the filter retainer 24 can be formed by a member having a good appearance.

The air filter of the present invention is not limited to the above embodiment, and the material for forming the filter retainer can be appropriately selected, and the shape may be rectangular or square in addition to the rhombus. Further, as long as the filter material can be held, it may be circular, oval, or oval.

10 Filter unit 10a Front surface 12 Intake port 14 HEPA filter 16 Air filter 16a Filter material 18 Step portion 20 Bottom plate 22 Filter frame 22a Opening edge 22b Groove bottom 24 Filter retainer 24a Rod member

Claims (5)

In an air filter attached to the intake port of a filter unit provided with an intake port for sucking air,
A filter frame attached to the intake port, a single-wafer-shaped filter material attached to the filter frame, and a filter retainer for holding the filter material in the filter frame are provided.
The filter frame is formed in the outer shape of the intake port by assembling members having a U-shaped cross section.
The filter retainer is formed in a frame shape by a rod member and enters the gap between the filter frame and the filter material to hold the filter material in the filter frame, and the maximum distance between the frames by the rod members facing each other. Is wider than the distance between the opening edges of the filter frames facing each other, and the planar shape of the filter retainer is a shape that falls within the plane formed by the opening edges of the filter frame. .. The air filter according to claim 1, wherein the maximum distance between the rod members and the opposing portions of the frames is narrower than the distance between the opposite groove bottoms of the filter frame. The intake port is square, and the filter frame is formed in a square frame.
The filter retainer is formed in a rhombus shape by the rod member, and the length of one diagonal line of the rhombus is longer than the long side of the opening edge of the filter frame, and between the groove bottoms of the filter frame facing each other. The air filter according to claim 2, wherein the air filter is formed to have a length narrower than the interval. The length of the other diagonal of the rhombus is formed to be longer than the short side of the opening edge of the filter frame and narrower than the distance between the groove bottoms located on the long side of the filter frame. The air filter according to claim 2 or 3. The air filter according to claim 3 or 4, wherein the diamond-shaped filter retainer has the rod members arranged diagonally, and the intersecting rod members are fixed to each other at positions intersecting each other on the diagonal lines.

Images