JP2009240999A - Air filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the bending deformation in the fold line direction of a filter medium pack. <P>SOLUTION: The filter medium pack 11 is provided inside a filter frame. The fold line direction of the filter medium pack 11 is parallel to a vertical direction V. The filter medium pack 11 is adhered to the inner surface of the filter frame with an adhesive. A support bar 13 is provided to an opening 50F on the front side of the filter frame. The support bar 13 is inserted into the gap between the respective inner surfaces 21N and 22N of top and base frame parts 21 and 22, and laid across the top and base frame parts 21 and 22. The support bar 13 is bent at both ends thereof, and the first and second bent plate parts 31A and 32A; 31B and 32B are respectively formed to both ends of the support bar 13. The first bent plate parts 31A and 31B are bent at an acute angle on the front inside thereof, and come into contact with inner surfaces 21N and 22N. The second bent plate parts 32A and 32B are locked with front surfaces 21F and 22F of the top and base frame parts 21 and 22. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an air filter used in a building air conditioner, an industrial air conditioner, etc., and more particularly to a thin air filter having a high wind pressure of air passing therethrough.

  In order to remove dust and pollutants in the air, filter media made of glass fiber or non-woven fabric such as polyester is folded into a pleated shape to form a filter media pack, and the filter media pack is a square frame filter frame. An air filter is known that is arranged inside. In this air filter, both ends in the crease direction of the filter pack are supported by the top frame portion and the ground frame portion of the filter frame, and both end portions in the direction in which the pleats are arranged are on both side frame portions of the filter frame. It is supported and arranged inside the filter frame.

  Conventionally, in order to prevent the filter medium pack from being detached by the air that is ventilated while ensuring the sealing performance between the filter frame and the filter medium pack, each end of the filter medium pack is attached to each inner surface of the filter frame with an adhesive. May be glued. In the filter medium pack, each pleat mountain is bent relatively freely in the direction in which the pleat mountains are arranged. For this reason, even if air with high wind pressure is ventilated, the side frame portion does not receive much force to deform from both side ends of the filter pack. In the direction in which the pleats are arranged, the filter medium pack is supported by the top frame portion and the ground frame portion and is not greatly deformed.

  However, since the filter pack is a relatively rigid member in the crease direction, it bends downstream when high wind pressure is passed, and bends around the center along the crease direction. Will be transformed. In the filter medium pack that is deformed in this way, cracks may occur at both ends or the center of the filter medium pack, the filtration efficiency may be reduced, and the pack may be blown off from that part. In particular, in a thin air filter having a large projected area and a small thickness, there is a possibility that the amount of deflection becomes large and the filtration efficiency and durability performance are greatly reduced.

  Conventionally, it is known that a support bar that is orthogonal to the crease direction and that is passed between both side frame portions is provided in the opening on the downstream side of the filter frame so that the filter media pack of the filter is not blown away. However, in such a conventional support bar, if the deformation deformation of the filter medium pack in the crease direction is suppressed, the support bar touches the filter medium pack, and the filter medium is damaged. Further, since the support bar is also pushed by the filter medium pack, it may be deformed together with the filter medium pack if it does not have a sufficient strength.

  Therefore, the present invention has been made in view of the above problems, and even in a thin filter having a high wind pressure of air passing therethrough, it prevents bending deformation in the fold direction of the filter medium pack and has high pressure resistance performance. An object is to provide an air filter.

  As a result of intensive studies, the inventors have found that when the filter media pack is bonded to the filter frame with an adhesive, when high-air pressure air is passed, it follows the deflection deformation in the fold direction of the filter media pack, It was found that the part twists and deforms so that the upstream ends approach each other. And in order to prevent the bending deformation of a filter material pack, it discovered that it was important to prevent the above-mentioned torsional deformation of a top-and-bottom frame part, and came to the following invention.

  The air filter according to the present invention includes both side frame portions facing each other, a ground frame portion connecting one end portions of both side frame portions, and a top frame portion facing the ground frame portion and connecting the other end portions of the both side frame portions. An air filter frame through which air passes from an opening on the front side to an opening on the rear side, and a filter material sheet folds along a large number of folds. It is formed by folding, has many pleats, both ends in the crease direction are bonded to the inner surfaces of the top frame part and the ground frame part, and both end parts in the direction in which the pleats are arranged are both side frame parts The filter pack is attached to the inner surface of the air filter frame and attached to the inside of the air filter frame, and the support bar is provided between the top frame part and the ground frame part at the opening on the front side.

  The front surface of the filter media pack is disposed behind the front surface of the top frame portion and the ground frame portion, and the support bar is inserted between the top frame portion and the inner surface of the ground frame portion, and the top frame portion and the ground frame It is preferably passed between the parts.

  The support bar is, for example, an elongated plate portion that extends in the crease direction, and a first bent plate portion that is connected to both ends of the elongated plate portion and that is bent at an acute angle forward from the elongated plate portion, have. In this case, the support bar is configured so that the connection portion between the first bent plate portion and the elongated plate portion is brought into contact with the inner surfaces of the top frame portion and the ground frame portion, respectively. It is inserted between the inner surfaces. The support bar is connected to each of the front end portions of the first bent plate portion, has a shape bent from the first bent plate portion, and engages with the front surfaces of the top frame portion and the ground frame portion. It is better to further have a second bent plate part.

  For example, each of the front end portions of the top frame portion and the ground frame portion is provided with a rising piece that is raised toward each of the ground frame portion and the top frame portion. And a support bar is inserted between the front end surfaces of these standing pieces, and is passed between a top frame part and a ground frame part. The support bar is preferably rigid.

  In the present invention, by passing the support bar between the top and bottom frame portions at the opening on the front side, it is effectively prevented that the front end portions of the top and bottom frame portions are twisted so as to approach each other. Therefore, the deformation deformation of the filter medium pack is reduced, and the pressure resistance performance of the air filter can be improved.

The present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing an entire air filter according to an embodiment of the present invention. In the following description, the width direction of the filter is described as the left-right direction L, the height direction of the filter is defined as the up-down direction V, and the thickness direction of the filter is described as the front-rear direction D.

  The air filter 10 according to the present embodiment is a thin air filter having a small thickness, and is a filter whose width (length in the left-right direction L) is longer than height (length in the up-down direction V). . The air filter 10 includes a filter medium pack 11, a filter frame 12, and a support bar 13. The filter media pack 11 is formed in a substantially rectangular parallelepiped shape by forming a filter media sheet made of glass fiber, synthetic fiber, nonwoven fabric, and the like in a zigzag manner along the crease, and has a large number of pleats. The filter media pack 11 has a crease direction arranged in parallel with the up-and-down direction V, and a direction in which pleats are arranged is a left-right direction L.

  The filter frame 12 is formed from, for example, a metal such as aluminum or a galvanized steel plate, a resin, a plywood, or the like. The filter frame 12 extends long in the vertical direction V and faces the left frame portions 23 and 24 facing each other, the ground frame portion 22 connecting the lower end portions of the both side frame portions 23 and 24, the ground frame portion 22, and It is comprised by the top frame part 21 which connects the upper end part of the both-sides frame parts 23 and 24. FIG. The ground frame part 22 and the top frame part 21 extend long in the left-right direction L. The filter frame 12 has a rectangular rectangular frame shape opened in the front-rear direction, and air is passed from the front opening 50F of the filter frame 12 toward the rear opening 50B.

  The filter media pack 11 has both end portions (upper end portion 11U, lower end portion 11D) in the crease direction (vertical direction V) bonded to the inner surfaces of the top frame portion 21 and the ground frame portion 22, respectively. Further, both end portions (left end portion 11L, right end portion 11R) in the direction in which the pleats are arranged (left and right direction L) are bonded to the inner surfaces of both side frame portions 23 and 24, and the filter pack 11 is an air filter. It is attached inside the frame 12.

  The support bar 13 is a plate-like member extending in the up-down direction V, and is disposed at a central portion in the left-right direction L of the filter frame 12. The support bar 13 is passed between the top frame portion 21 and the ground frame portion 22 in the opening 50 </ b> F on the front side of the filter frame 12.

  2 is a cross-sectional view of the air filter taken along line II-II in FIG. The top frame portion 21 includes a rectangular flat plate portion 21H and rising pieces 25F and 25B raised from the front end and the rear end of the flat plate portion 21H toward the lower side (the ground frame portion 22). Molded integrally. Similarly, the ground frame portion 22 includes a rectangular flat plate portion 22H and rising pieces 26F and 26B raised from the front end and the rear end of the flat plate portion 22H upward (the top frame portion 21). These are integrally formed. The front end surfaces 25T and 26T of the rising pieces 25F and 26F are planes orthogonal to the vertical direction V. The flat plate portions 21H and 22H are also rectangular flat plate members that are orthogonal to the vertical direction V, whereby the top and bottom frame portions 21 and 22 face each other.

  The front surfaces 21F and 22F of the rising pieces 25F and 26F constitute the front surfaces of the top frame portion 21 and the ground frame portion 22, respectively. Further, the tip surface 25T of the rising piece 25F constitutes the inner surface 21N of the top frame portion 21 together with the lower surface 21D of the flat plate portion 22H, and the tip surface 26T of the rising piece 26F includes the upper surface 22U of the flat plate portion 22H. An inner surface 22N of the top frame portion 21 is configured. The rising pieces 25F, 25B, 26F, and 26B are provided over the entire length from the left end to the right end of the top frame portion 21 and the ground frame portion 22, respectively. Each of the side frame portions 23 and 24 has the same configuration as the top and bottom frame portions 21 and 22, and is a rectangular flat plate portion (not shown) orthogonal to the left-right direction L, and front and rear end portions of the flat plate portion. And a rising piece (not shown) raised from each.

  Gaskets 41 and 42 formed of rubber, resin or the like are attached to the front surfaces 21F and 22F of the rising pieces 25F and 26F. Similarly, gaskets 43 and 44 (see FIG. 1) are also attached to the front surfaces of the rising pieces on the front side of the side frame portions 23 and 24, and the front surface of the filter frame 12 is provided with a gasket over the entire circumference. Become. The gaskets 41 to 44 may be formed as an integral member or may be formed as separate members.

  The upper end portion 11U of the filter medium pack 11 is disposed so as to be sandwiched between the rising pieces 25F and 25B, and is bonded to the lower surface 21D of the flat plate portion 21H with an adhesive. Similarly, the lower end portion 11D of the filter media pack 11 is disposed so as to be sandwiched between the rising pieces 26F and 26B, and is bonded to the upper surface 22U of the flat plate portion 22H with an adhesive. Accordingly, the front surface 11F of the filter medium pack 11 is disposed on the rear side of the front surfaces 21F and 22F by the thickness in the front-rear direction D of the rising pieces 25F and 26F. Further, left and right end portions 11L and 11R (see FIG. 1) of the filter medium pack 11 are also sandwiched between two rising pieces and bonded to a flat plate portion.

  FIG. 3 shows a side view of the support bar. FIG. 4 is an enlarged perspective view of one end portion of the support bar 13 in the longitudinal direction. The support bar 13 is formed of a rigid body such as a metal such as a steel plate, a stainless steel plate, or an aluminum plate or a resin having sufficient strength, and does not have a spring property and does not substantially bend and deform. The support bar 13 is an elongated plate-like member, and has a shape in which both end portions in the longitudinal direction are bent twice. The support bar 13 is formed, for example, by bending one elongated rectangular metal plate.

  The support bar 13 has an elongated rectangular elongated plate portion 30, and a first end 30 </ b> U in the longitudinal direction of the elongated plate portion 30 has a first shape that is bent at an acute angle θ from the elongated plate portion 30 to the front inner side. The bent plate portion 31A is continuously provided. And the 2nd bending board part 32A which exhibits the shape bent by acute angle (theta) 'outward from the 1st bending board part 31A is continuously provided in the front-end | tip part of the 1st bending board part 31A. ing. In the present embodiment, the acute angles θ and θ ′ are the same angle, and the second bent plate portion 32A is parallel to the elongated plate portion 30. The acute angles θ and θ ′ are, for example, 84 to 86 °. The acute angle θ ′ may be an angle different from the acute angle θ according to the configuration of the front surface 21F of the top frame 21 and the configuration of the gasket 41, and θ ′ may not be an acute angle. The lower end portion of the support bar 13 is also formed with first and second bent plate portions 31B and 32B having the same configuration.

  Side-folded plate portions 33L and 33R that are bent 90 degrees forward from the elongated plate portion 30 are connected to both side end portions 30L and 30R in the width direction of the elongated plate portion 30, respectively. The side bent plate portions 33L and 33R are provided over substantially the entire length from one end 30U to the other end 30D of the elongated plate 30 as shown in FIG. The side bent plate portions 33L and 33R are members for reinforcement against compression in the longitudinal direction.

  Next, referring to FIG. 2 again, the configuration when the support bar 13 is attached to the filter frame 12 will be described. The support bar 13 is configured so that the front surface 30F of the elongated plate portion 30 faces the front of the filter frame 12, and the longitudinal direction and the width direction of the elongated plate portion 30 coincide with the vertical direction V and the horizontal direction L, respectively. The rising pieces 25F and 26F are inserted between the front end surfaces 25T and 26T.

  The length in the longitudinal direction of the elongated plate portion 30 when not fitted into the filter frame 12 is slightly longer than the distance between the front end surfaces 25T and 26T. Therefore, the support bar 13 fitted in the filter frame 12 is pressed from the front end surfaces 25T and 26T toward the inside of the filter frame 12 by the first bent plate portions 31A and 31B coming into contact with the front end surfaces 25T and 26T. Will be. As a result, the support bar 13 is prevented from falling off the filter frame 12.

  The first bent plate portions 31A and 31B have a shape that is bent at an acute angle toward the front inner side with respect to the elongated plate portion 30, and the plate portions 31A and 31B are tips perpendicular to the vertical direction V. It will be inclined inward of the filter frame 12 with respect to the surfaces 25T and 26T. Therefore, only the connection portions C1 and C2 of the first bent plate portions 31A and 31B with the elongated plate portion 30 are brought into contact with the front end surfaces 25T and 26T. Furthermore, each of the second bent plate portions 32A and 32B comes into contact with the front surfaces of the gaskets 41 and 42 and engages with the front surfaces 21F and 22F via the gaskets 41 and 42.

  The support bar 13 in the present embodiment is, for example, an inner surface 21N of the top and bottom frame portions 21 and 22 by being pushed in from the front side of the filter frame 12 in which the filter medium pack 11 is attached and assembled into a square frame shape. , 22N. However, the support bar 13 may be fitted between the inner surfaces 21N and 22N at the same time when the filter frame 12 is assembled. In the present embodiment, the second bent plate portions 32A and 32B are engaged with the front surfaces 21F and 22F of the top and bottom frame portions 21 and 22 via the gaskets 41 and 42, but directly contact the front surfaces 21F and 22F. You may engage in contact. In this case, the gaskets 41 and 42 are attached in front of the second bent plate portions 32A and 32B.

  Next, the operation of the support bar in this embodiment will be described. When high wind pressure air passes through the filter medium pack 11 from the front to the rear, a large force is applied to the filter medium pack 11, and the top and bottom frame parts 21 and 22 bonded to the filter medium pack 11 are attached to the front edge part side. The support bar 13 is pressed in an attempt to twist and deform so as to approach each other. Against such pressing, the support bar 13 presses the inner surfaces of the top and bottom frame parts 21 and 22 outward, thereby preventing the torsional deformation. In the present embodiment, by preventing torsional deformation of the top and bottom frame portions 21 and 22, the deformation deformation of the filter medium pack 11 is suppressed, and the pressure resistance performance of the filter 10 can be improved. In particular, in this embodiment, the support bar 13 is formed of a rigid body having sufficient strength against bending and compression, and is not substantially deformed by the pressing of the top and bottom frame portions 21 and 22, so that the filter media pack can be more effectively used. 11 bending deformation can be prevented.

  When the support bar 13 is not provided in the filter medium pack 11, the center position in the left-right direction L that is the farthest from the both side frame portions is most flexibly deformed. In the present embodiment, since the support bar 13 is provided at a position corresponding to the location where the deflection deformation is large, the deflection deformation of the filter medium pack 11 is effectively prevented.

  The first bent plate portions 31 </ b> A and 31 </ b> B that are in contact with the inner surfaces 21 </ b> N and 22 </ b> N of the top and bottom frame portions 21 and 22 are inclined at an acute angle toward the front inner side with respect to the elongated plate portion 30. Therefore, even if the support bar 13 is pressed by the top and bottom frame portions 21 and 22 due to the torsional deformation of the top and bottom frame portions 21 and 22, the support bar 13 is not pushed forward. Further, since the support bar 13 is engaged with the front surfaces of the top and bottom frame portions 21 and 22 by the second bent plate portions 32A and 32B, the support bar 13 is pushed backward by the above-described pressing of the top and bottom frame portions 21 and 22. There is nothing. With the above configuration, the support bar 13 according to the present embodiment is stably attached to the filter frame 12 and is not detached from the filter frame 12 due to the pressing of the top and bottom frame portions 21 and 22.

  Further, in the present embodiment, the support bar 13 is formed of a rigid body, and is pushed between the inner surfaces 21N and 22N to be attached between the first bent plate portions 31A and 31B and the inner surfaces 21N and 22N. Friction increases. However, in the present embodiment, in each of the first bent plate portions 31A and 31B, only the connection portions C1 and C2 are in contact with the inner surfaces 21N and 22N and are in line contact therewith. Therefore, when the support bar 13 is pushed in, the friction is kept small, and the support bar 13 is pushed in and attached relatively easily. Further, when the support bar 13 is pushed into a predetermined position, the second bent plate portions 32A and 32B engage with the front surfaces 21F and 22F. There will be no damage.

  In the present embodiment, only one support bar 13 is provided, but two or more support bars 13 may be provided. However, since one or two support bars 13 can sufficiently improve the pressure resistance of the filter, it is preferable to provide one or two support bars 13. When a plurality of support bars 13 are provided, the distance between adjacent support bars is equal to each other, and the distance is preferably equal to the distance between each side frame and the support bar adjacent to the side frame.

Next, in order to demonstrate the effect of the present invention, air filters according to the following examples and comparative examples were evaluated.
[Example]
The air filter described in the above embodiment having a width of 1678 mm, a height of 658 mm, and a thickness of 68 mm was prepared. This air filter was provided with a support bar having a length of 658 mm and a width of 38 mm at the center in the width direction of the filter. In the support bar, the length of the elongated plate portion is 630 mm, the height of the first bent plate portion and the side bent plate portion is 7 mm, and the length of the second bent plate portion is 14 mm. And it was parallel to the elongated plate portion. The first bent plate portion was bent 84 ° from the elongated plate portion.
[Comparative example]
An air filter similar to the example was prepared except that the support bar was not provided.

[Bending test]
The air of 100 to 450 Pa was passed through the air filters of Examples and Comparative Examples from the front side, and the amount of deflection of the filter media pack at that time was measured. For the air filter of the example, the deflection amount was measured at the center position (point A) in the width direction and at the center position (point B) between the point A and the left frame. In addition, A point and B point were arrange | positioned in the center position in the height direction of an air filter. Moreover, about the air filter of the comparative example, it measured only about the deflection amount of A point.

  FIG. 5 shows the relationship between the wind pressure and the amount of deflection in the deflection test. As shown in FIG. 5, in the comparative example in which the support bar was not provided, there was almost no deflection at the low wind pressure, but when the wind pressure was high (450 Pa), the deflection amount at the point A markedly increased, and the filter medium pack It can be understood that was deformed greatly. On the other hand, in the Examples, the filter medium pack did not substantially bend at the point A. In addition, at point B where the amount of deflection is expected to become the largest, the amount of deflection does not increase that much when the wind pressure is high, although it is somewhat deflected at low wind pressure, and the deflection of the filter media pack at high wind pressure is effective. It can be understood that it was able to be suppressed.

It is a perspective view of an air filter concerning one embodiment of the present invention. It is sectional drawing which follows the II-II line | wire in FIG. It is a side view of a support bar. It is a perspective view which shows one edge part of a support bar. It is a graph which shows the relationship between a pressure and the amount of deflection when the air filter in an example and a comparative example is evaluated by a deflection test.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Air filter 11 Filter medium pack 12 Filter frame 13 Support bar 21 Top frame part 22 Ground frame part 23 Left frame part (side frame part)
24 Right frame (side frame)
30 Elongated plate portion 31A, 31B First bent plate portion 32A, 32B Second bent plate portion C1, C2 Connection portion

Claims (6)

It is constituted by both side frame portions facing each other, a ground frame portion connecting one end portions of the both side frame portions, and a top frame portion facing the ground frame portion and connecting the other end portions of the both side frame portions, An air filter frame that has a square frame shape that is open at the front and rear, and through which air passes from the opening on the front side toward the opening on the rear side;
The filter sheet is formed by fold folding along a large number of folds, has a large number of folds, both ends in the fold direction are bonded to the inner surfaces of the top frame and the ground frame, and the folds are Each of the end portions in the direction in which they are arranged is bonded to the inner surface of the both side frame portions, and the filter medium pack attached to the inside of the air filter frame,
An air filter comprising: a support bar that is passed between the top frame part and the ground frame part at the opening on the front side. The front surface of the filter media pack is disposed on the rear side from the front surface of the top frame portion and the ground frame portion,
2. The air filter according to claim 1, wherein the support bar is fitted between the top frame portion and the inner surface of the ground frame portion and is passed between the top frame portion and the ground frame portion. . The support bar is provided with an elongated plate portion extending in the crease direction, and a first bent plate portion that is connected to both ends of the elongated plate portion and is bent at an acute angle from the elongated plate portion toward the front inner side. And
The support bar is configured so that a connection portion between the first bent plate portion and the elongated plate portion is brought into contact with the inner surfaces of the top frame portion and the ground frame portion, respectively. The air filter according to claim 2, wherein the air filter is fitted between the inner surfaces of the frame portion.   The support bar is connected to each end portion of the first bent plate portion, has a shape bent from the first bent plate portion, and front surfaces of the top frame portion and the ground frame portion, respectively. The air filter according to claim 3, further comprising a second bent plate portion engaged with the air filter. Each of the top end portion of the top frame portion and the ground frame portion is provided with a rising piece that is raised toward each of the ground frame portion and the top frame portion,
The air filter according to claim 2, wherein the support bar is fitted between the front end surfaces of the rising pieces and is passed between the top frame portion and the ground frame portion.   The air filter according to claim 1, wherein the support bar is a rigid body.

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