JP2008188499A - Filter for air purification - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the effective area of a filter medium without degrading the aperture ratio of a filter. <P>SOLUTION: The filter for air purification is provided with a filter frame and at least two filter media 30 arranged inside the filter frame. Each filter medium 30 is folded in a pleat shape, many pleat peaks 33 are formed and the folds are made horizontal. Each of the respective pleat peaks 33 at one end 30A in the fold direction of one filter medium 30 is inserted to a dent part 34 formed between the respective pleat peaks 33 at one end in the fold direction of the other filter medium 30. Thus, each of the pleat peaks 33 of each other is alternately overlapped and the two filter media 30 are interconnected in a chevron shape. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an air purification filter configured such that filter media folded in a pleat shape are connected in a V shape, or a plurality of V shapes are connected in a zigzag manner.

  2. Description of the Related Art Conventionally, an air purification filter in which a filter medium folded in a pleat shape is V-shaped, or a plurality of V-shaped filter media are formed in a zigzag shape, and a double-pleat filter medium is mounted in a filter frame. It has been known.

For example, in the double pleat type filter media described in Patent Documents 1 and 2, a V-shaped fold portion is formed by setting a fold fold angle for each fixed number of pleats to 180 °. Are arranged at the openings on the inflow side and the outflow side of the air filter. In these air filters, the opening ratio a on the air inflow side is expressed by the equation (W) where the width of the filter frame is W, the number of pleats of the double pleated filter medium (number of V-shaped) is n, and the height of the pleats is h. Calculated in 1).
a = {W− (h × n × 2)} / W × 100 (1)

The aperture ratio a is preferably as high as possible in order to suppress the pressure loss of the passing air. Moreover, it is desirable to increase the effective area (filterable area) of the filter medium as much as possible in order to increase the dust holding capacity of the filter medium.
JP 2002-95922 A JP 2006-88048 A

  However, in the air filters of Patent Documents 1 and 2, if the effective area of the filter medium is to be increased, the height of the pleats of the filter medium or the number of V-shapes must be increased, and the aperture ratio decreases. . On the other hand, when trying to increase the aperture ratio a, as apparent from the above formula (1), the height of the pleats of the filter medium or the number of V-shapes must be reduced, and the effective area of the filter medium decreases. Will end up.

  Therefore, the present invention has been made in view of such problems, and provides an air purification filter capable of increasing the effective area of a filter medium without reducing the aperture ratio of the air filter. For the purpose.

  An air purification filter according to the present invention includes a filter frame and at least two filter media having a large number of pleats formed by folds along a predetermined fold, and the two filter media have folds on the same plane. It is arranged inside the filter frame so as to be substantially parallel to each other and connected in a V shape, and each pleat mountain at one end in the fold direction of one filter medium is connected to one end in the fold direction of the other filter medium. It is inserted in the trough formed between the pleats, and the pleats of each other are alternately overlapped. When three or more filter media are provided, each filter media is preferably arranged inside the filter frame and connected to other filter media in a V shape. A plurality of filter media are formed in, for example, a zigzag shape by being connected in a V shape in this way.

  It is preferable that a plurality of separators for separating adjacent pleats are provided on both the front and back surfaces of the filter medium so as to intersect with each other in the crease direction. Moreover, it is preferable that the plurality of separators are arranged in the crease direction so as not to be provided on the surface on which the other filter medium is inserted in the portion where the pleats of the filter medium overlap. Thereby, the pleat of the other filter medium inserted between adjacent pleats of one filter medium can be a separator for separating the adjacent pleats of one filter medium. The separator is, for example, a thread separator, a hot melt separator, an embossed separator provided on a filter medium, or the like.

  In the present invention, the pleats are alternately overlapped at the connecting portion of the filter medium connected in a V shape, so that the height of the pleats of the filter medium and / or the number of V shapes formed by the filter medium is increased. Thus, the effective area of the filter medium can be increased without reducing the aperture ratio of the air filter. Similarly, the aperture ratio of the air filter can be improved without reducing the effective area of the filter medium.

  Hereinafter, the present invention will be described with reference to FIGS. In the following description, the vertical direction and the horizontal direction in FIG. 1 will be described as the vertical direction and the horizontal direction, respectively, and the vertical direction in FIG.

  As shown in FIGS. 1 and 2, the air purification filter 10 includes a square frame-shaped filter frame 20 and a plurality of filter media 30 arranged in the filter frame 20. As shown in FIG. 2, air flows into the filter 10 from the front side of the filter toward the back side.

  The filter frame 20 includes an upper frame 11, a lower frame 12, a left frame 13, and a right frame 14. The upper frame 11 and the lower frame 12 extend in the left-right direction (horizontal direction), and the left frame 13 and the right frame. 14 extends in the vertical direction (vertical direction). The left frame 13 connects the left ends of the upper frame 11 and the lower frame 12, and the right frame 14 connects the right ends of the upper frame 11 and the lower frame 12.

  In the air inflow side (front side) opening 25A and the air outflow side (back side) opening 25B of the filter frame 20, a plurality of connecting members 15A, 15B extending in the vertical direction are respectively connected to the upper frame 11 and the lower frame 12. Connect. Each of the connecting members 15 </ b> A and 15 </ b> B is a columnar member having a substantially U-shaped cross section that has a shape in which both end portions in the left-right direction are bent inside the filter 10. On the air inflow side of the filter frame 20, each of the connecting members 15 </ b> A arranged on the leftmost side and the rightmost side is formed integrally with the left side frame 13 and the right side frame 14, and the width in the left-right direction is different from that of the other connecting members 15. Smaller than that. The filter frame 20 and the connecting members 15A and 15B are formed of a metal such as a galvanized steel plate, an aluminum plate, and stainless steel, wood, or resin.

  The connecting members 15A and 15B provided on the front side and the back side of the filter frame 20 are arranged at equal intervals in the left-right direction, respectively, and the center positions of two adjacent connecting members 15A on the front side in the left-right direction, respectively. In addition, a connecting member 15B on the back side is provided.

  The filter medium 30 is configured by filter paper or nonwoven fabric formed from glass fiber or synthetic fiber. As shown in FIGS. 3 and 4, the filter medium 30 is folded in a pleat shape so that folds 32 in the same filter medium 30 are parallel to each other, and a large number of pleats 33 are formed. Each filter medium 30 folded in this way has a plate shape.

  The plurality of filter media 30 are arranged so that the folds are substantially parallel to a horizontal plane (the same plane), and the planes constituting the multiple pleats 33 are substantially horizontal and substantially parallel to each other. Arranged inside. As shown in FIG. 2, one end 30A in the fold direction of each filter medium 30 is arranged in the opening 25A on the front side, and the other end 30B in the fold direction is arranged in the opening 25B on the back side. .

  One end portions 30A and the other end portions 30B of the filter media 30 adjacent in the left-right direction are connected to each other, and the two filter media 30 form a V shape when viewed from above. That is, the fold direction of the other filter medium 30 is tilted along the horizontal plane with respect to the fold direction of one filter medium 30, and the two filter media 30 are connected in a V shape. At this time, as shown in FIG. 4, each pleat mountain 33 of one end 30 </ b> A of the filter medium 30 is a valley formed between the fold mountain 33 and the pleat 33 of one end 30 </ b> A of another adjacent filter medium 30. 34, and the pleats 33 of each other are alternately overlapped.

  At the edge 30E in the fold direction of one end 30A of one filter medium 30, a part of the pleat 33 in the width direction overlaps a part of the edge 30E in the width of the fold 33 of the other filter medium 30. And the rest does not overlap. The overlap width between the pleats 33 is reduced as the distance from the edge 30E increases. In addition, the overlap width of the pleat mountain 33 in the edge portion 30 </ b> E is, for example, 0.20 to 0.80 of the pleat height of the pleat mountain 33.

  Similarly, each pleat 33 of the other end 30B of the filter medium 30 is inserted between each pleat 33 of the other end 30B of the other adjacent filter medium 30, and the pleats 33 are overlapped. It is connected in a V shape. With the above configuration, the plurality of filter media 30 are alternately connected from the left frame 13 to the right frame 14 on the back side and the front side, and exhibit a zigzag shape when viewed from above.

  As shown in FIG. 2, the two connected one end portions 30A are arranged inside the U-shape of the connecting member 15A, are bonded to the connecting member 15A with an adhesive, and the end portion 30A and the connecting member 15A are sealed. At the same time, the two connected one end portions 30A are also bonded and fixed to each other by the adhesive. Similarly, the two other end portions 30B connected to each other are disposed inside the U-shape of the connecting member 15B, and are bonded to the connecting member 15B by an adhesive and are also bonded and fixed to each other by the adhesive. Further, one end 30A of each of the filter media 30 arranged on the leftmost and rightmost sides is not bonded to the other filter media, and is arranged inside the U-shape of each of the connecting members 15A provided on the leftmost and rightmost sides. It is bonded to the member 15A with an adhesive. In addition, the upper end part and lower end part of the filter medium 30 are similarly adhere | attached on the upper frame 12 and the lower frame 11 with an adhesive agent.

  As shown in FIGS. 3 and 4, a separator 35 is provided on each of the front surface 37 </ b> A side and the rear surface 37 </ b> B side of the filter medium 30. The separator 35 is zigzag along the fold-folded surface 37A and the back surface 37B while being orthogonal to each fold from one end to the other end in the vertical direction of the filter medium 30, and is bonded to the front surface 37A and the back surface 37B. The separator 35 adhered to the surface 37A of the filter medium 30 is in close contact with the separator 35 adhered on the opposing surface 37A in a valley portion 34 formed between two adjacent pleats 33, thereby Adjacent pleats 33 are separated by a certain distance. Similarly, the separator 35 adhered to the back surface 37B of the filter medium 30 also holds the adjacent pleats 33 at regular intervals. The separator 35 is, for example, a thread separator configured by coating an adhesive on the thread surface.

  A plurality of separators 35 are arranged at equal intervals along the crease direction on each of the front surface 37A side and the back surface 37B side. However, in the vicinity of the one end portion 30A and the other end portion 30B in the crease direction of the filter medium 30 in which the other filter medium 30 is inserted, a surface (front surface 37A or back surface 37B) on which the other filter medium 30 is inserted is provided with a separator. 35 is not provided.

  As described above, in the present embodiment, the end of the filter medium 30 disposed in the opening of the filter 10 is connected to the end of the adjacent filter medium 30 by overlapping the pleats 33 with each other. By increasing the height of the pleats and / or the number of V-shapes formed by the filter medium, the aperture ratio of the filter medium 30 can be increased without reducing the effective area of the filter medium. Similarly, the effective area of the filter medium can be increased without decreasing the aperture ratio. Therefore, the filter 10 according to the present embodiment can be expected to reduce the initial pressure loss and increase the dust holding capacity. In particular, in the case of a HEPA filter, since the pressure loss of the filter paper itself is large, a great effect can be expected.

  In addition, in the vicinity of both end portions 30A and 30B in the crease direction of the filter medium 30, the separator 37 is not provided on the surface of the front surface 37A and the back surface 37B where the other filter medium 30 is inserted. 33 is simply inserted between the pleats 33 of the other filter medium 30. Further, the pleats 33 of the other filter medium 30 inserted between the adjacent pleats 33 of one filter medium 30 also serve as a separator for keeping a constant distance between the pleats 33.

  EXAMPLES Hereinafter, although an Example is further shown and this invention is demonstrated in detail, this invention is not necessarily limited by a following example.

[Example]
The structure of the filter medium arrange | positioned in the filter frame of an Example is shown to FIGS. In Example 1, a plurality of filter media were provided, connected in a V shape, and arranged in the filter frame. Vertical dimension H, horizontal dimension W, depth dimension D inside filter frame, pleat height of filter medium (width of each pleat ridge) h, pleat pitch (separation distance between adjacent crease folds in the same filter medium) p, filter The number n of V-shapes opened on the inflow side of the filter and the wrap width k of the filter medium stacked on the edge are set to the sizes shown in Table 1, and the aperture ratio a of the filter and the effective area Q of the filter medium are expressed by the following equations: Calculated according to (2) and (3). The effective area Q of the filter medium is a value excluding the area of the wrap portion, as is apparent from the equation (3). Each value calculated in Table 1 is simply calculated by ignoring the thickness of the frame, the thickness of the connecting member, and the like.

  The second embodiment is an example in which the wrap width k of the filter medium is larger than that of the first embodiment. Examples 3 and 4 are examples in which the number n of V-shapes is smaller than in Example 1, the pleat height h is increased, and the wrap width k of the filter medium is larger than that in Example 1. Examples 5 and 6 are examples in which the number n of V-shapes is the same as in Example 1, and the pleat height h and the wrap width k of the filter medium are made larger than those in Example 1.

なお、ｒはＶ字形の開口幅であって、以下の式により算出された値である。

In addition, r is a V-shaped opening width and is a value calculated by the following equation.

なお、ｂはＶ字形のピッチ、ｅは図６に示される所定の長さ、角度θ１、θ２、θ３は図６に示される所定の角度である。

Note that b is a V-shaped pitch, e is a predetermined length shown in FIG. 6, and angles θ1, θ2, and θ3 are predetermined angles shown in FIG.

なお、Ｌは濾材の折り目方向に沿った長さ、Ａは隣接するひだ山同士がラップする面積、ｍは濾材のひだ山数であって、以下の式により算出される。

In addition, L is the length along the crease direction of the filter medium, A is an area where adjacent pleats wrap, m is the number of pleats of the filter medium, and is calculated by the following formula.

[Comparative example]
Each comparative example is an example when the filter medium is connected to the zigzag without overlapping the folds. Comparative Example 1 is the same as Example 1 except that the number n of V-shapes is one less than that of Example 1 and that the filter medium is disposed so that the ends of adjacent filter media are in contact with each other. It has the following structure. Comparative Example 2 or 3 has the same structure as Comparative Example 1 except that the number n of V-shapes is one more or one less than Comparative Example 1. Comparative Example 4 or 5 has the same structure as Comparative Example 1 except that the pleat height h is larger or smaller than Comparative Example 1.

  As is clear from the above calculation results, in Comparative Example 2, when the pleat height h of the filter medium is made the same and the number n of V-shapes is increased as compared with Comparative Example 1, the effective area Q of the filter medium is increased. However, the aperture ratio a decreased. On the other hand, when the number n of V-shapes was reduced as in Comparative Example 3, the aperture ratio a could be increased, but the effective area Q was reduced. Further, as in Comparative Examples 4 and 5, even if the number of V-shaped n is the same and the pleat height h is reduced or increased, either the effective area Q or the aperture ratio a can be increased. However, the other fell.

  As described above, when the filter medium is connected to the zigzag without overlapping the pleat mountains, and either the pleat height h of the filter medium or the number n of the V shape is increased or decreased, either the aperture ratio a or the effective area Q One of them can be increased, but the other of the aperture ratio a and the effective area Q decreases.

  On the other hand, in Example 1, the effective area Q of the filter medium can be increased by increasing the number n of the V shape as compared with Comparative Example 1, and the pleats at the ends of the filter medium are overlapped. Thus, the aperture ratio a could be maintained at the same level as in Comparative Example 1. Further, as in Example 2, when the wrap width k was increased, the effective area Q was maintained at the level of Comparative Example 1, and the aperture ratio a could be increased. From the results of Examples 1 and 2, it is clear that both the aperture ratio a and the effective area Q can be increased by setting the wrap width k to a length between Examples 1 and 2.

  Further, as is clear from Examples 3 to 6, even if both the pleat height h or the pleat height h and the number n of the V shape are larger than those of Comparative Example 1, as in Examples 1 and 2, The aperture ratio a, the effective area Q of the filter medium, or both can be increased.

  As described above, in this embodiment, the pleat peaks at the end of the filter medium are overlapped, and the fold height h of the filter medium and / or the number n of the V-shapes are increased without reducing the aperture ratio a. It was possible to increase the effective area Q of the filter medium. Similarly, the aperture ratio a could be improved without reducing the effective area Q of the filter medium. Furthermore, both the effective area Q and the opening a of the filter medium could be improved.

It is the front view which looked at the filter for air purification concerning this embodiment from the air inflow side. It is a top view for showing the inside of the filter for air purification concerning this embodiment. It is a disassembled perspective view which decomposes | disassembles and shows two filter media typically. It is a perspective view which expands and schematically shows a part of connection part of a filter medium. It is a top view for showing the filter medium which concerns on an Example. It is a top view which expands and shows the filter medium of an Example. It is a top view which expands and shows the Y section in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Filter 20 Filter frame 30 Filter medium 30A One end part 30B The other end part 32 Fold line 33 Hidayama 35 Separator

Claims (3)

A filter frame and at least two filter media having a large number of pleats formed by being folded along a predetermined crease;
The two filter media are arranged inside the filter frame so that the folds are substantially parallel to the same plane and are connected in a V shape,
Each pleat mountain at one end in the fold direction of one filter medium is inserted into a trough formed between the pleats at one end in the fold direction of the other filter medium, and each pleat mountain alternately An air purification filter characterized by being overlapped.   A plurality of separators for separating adjacent pleat ridges are provided on both the front and back surfaces of the filter medium so as to intersect the crease direction, and the plurality of separators are other parts in the portion where the pleats of the filter medium overlap. 2. The air purification filter according to claim 1, wherein the air purification filter is arranged in a crease direction so as not to be provided on a surface on the filter insertion side.   The air according to claim 2, wherein the pleats of the other filter medium inserted between adjacent pleats of the one filter medium serve as a separator for separating the adjacent pleats of the one filter medium. Filter for purification.

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