JP2010201352A - Air filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate putting in or taking out of a filter medium into a filter frame in an air filter in which a filter medium pack and a prefilter are attached to the same filter frame. <P>SOLUTION: The air filter 10 includes the filter frame 12, the filter medium pack 11 and the prefilter 14. The filter frame 12 is a square frame opened to front and back and possesses both-side plates 23, 24, a ceiling plate 21 and a bottom plate 22. The filter medium pack 11 is supported on the inner surfaces of the plates 21-24. In the inner surface of the bottom plate 22, a groove part 26 is formed by depressing the front side part of the part supporting the filter medium pack 11. The prefilter 14 is of a square shape, its one part is engaged with the groove part 26 to be attached to the filter frame 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a front access type filter medium exchange type air filter in which a filter medium pack and a pre-filter are attached inside the same filter frame, and the filter medium pack is taken in and out from an opening on the front side.

  Conventionally, in order to remove dust and contaminants in the air, filter paper made of glass fiber is folded into a pleated shape to form a filter media pack, and the filter media pack is disposed inside a square frame filter frame. Air filters are known. When the air filter is a medium performance filter, for example, from the viewpoint of environmental protection, a filter medium replacement type in which the filter frame is repeatedly used by replacing only the used filter medium pack whose service life has passed has been widely used in recent years. is there.

  As an example of a filter medium exchange type filter, a so-called front access type filter is known in which a filter medium pack is taken in and out through an opening on the front side of a filter frame. In the front access type filter, for example, the top plate of the filter frame is rotated around the rear side so that the front side is separated from the both side plates, and then the filter medium pack is inserted and removed from the opening on the front side. (See Patent Document 1).

Japanese Patent No. 3273333

  By the way, a pre-filter may be disposed in front of the medium performance filter so that coarse dust does not adhere to the filter medium pack. In general, the pre-filter is provided separately from the medium-performance filter. However, in recent years, in front-access type filters, it has been considered that the pre-filter is attached to the same filter frame as the filter medium pack of the medium-performance filter. ing.

  When there is a prefilter, in normal operating conditions, air is ventilated from the prefilter side to the filter medium pack. However, when an operational abnormality occurs, air may flow from the filter medium pack side to the prefilter. Therefore, the filter frame to which both the filter media pack and the pre-filter are attached is used to press the pre-filter on the front opening side end portion in order to prevent the pre-filter from dropping off from the filter frame at the time of abnormal operation. A presser part is provided.

  However, when the presser part is provided in the filter frame, the presser part becomes an obstacle, and the filter medium pack cannot be pulled out or inserted horizontally and put in and out. Therefore, when the filter medium pack is put in and out, it is necessary to turn the filter medium pack, and the workability of replacing the filter medium pack is lowered.

  Therefore, the present invention has been made in view of the above problems, and in a front access type filter in which a filter medium pack and a pre-filter are attached inside the same filter frame, it is possible to improve the workability of replacing the filter medium pack. Objective.

  The air filter according to the present invention is a square frame that is open at the front and rear, and is formed by a side frame portion that faces each other, a filter frame that includes a top frame portion and a ground frame portion that face each other, these both side frame portions, A filter medium supported on the inner surface of each of the top frame part and the ground frame part and provided inside the filter frame and a prefilter arranged on the front side of the filter medium, and the inner surface of the ground frame part supports the filter medium The front part of the part to be recessed is recessed to form a groove part extending in a direction in which both side frame parts face each other, and the prefilter has a quadrangular shape, one side of which is fitted into the groove part. It is attached to.

  The ground frame portion preferably includes a support plate portion that faces the top frame portion and supports the filter medium pack, and a U-shaped plate portion that is connected to the front end of the support plate portion and has a groove formed therein. . The U-shaped plate portion includes a bottom plate portion that forms the bottom surface of the groove portion, and both side wall plate portions that form side walls of the groove portion and face in the front-rear direction. It is preferable that the support plate portion is disposed at a position that coincides with the front end of the side wall plate portion on the front side in the top-to-bottom direction or closer to the top frame portion side than the front end.

  The top frame part can be rotated so that the front side is separated from the both side frame parts around the rear side, and the front end part of the top frame part is provided with a front upright part raised toward the ground frame part. It is preferred that In this case, the other side of the pre-filter is disposed behind the front upright, and the front upright presses the prefilter backward.

  The pre-filter is, for example, a square frame that is opened in the front-rear direction, and includes a front-side frame portion that faces each other, a pre-filter frame that includes a front top frame portion and a front ground frame portion that face each other, and a pre-filter frame And a pre-filter filter medium disposed inside. In this case, in the prefilter, the front ground frame portion is fitted into the groove portion, and both the front side frame portions are attached to the front end portions of the both side frame portions, respectively.

  Moreover, it is preferable that a both-sides frame part is a both-sides board which mutually opposes, for example, Comprising: The front-end part of each both-sides board is fitted by each of both the front side frame parts. In this case, it is more preferable that a groove is provided in each of the front side frame portions, and each of the front end portions of both side plates is fitted in the groove.

  In the present invention, in the ground frame portion, the groove portion into which the pre-filter is fitted is recessed from the portion that supports the filter medium, and therefore the side wall of the groove portion hinders the insertion and removal of the filter medium into the filter frame. Is prevented.

It is a perspective view of the air filter of this embodiment, Comprising: A state when a pre filter and a filter medium pack are removed from the filter frame is shown. It is a perspective view which shows a casing. It is a front view which shows a filter frame. It is a side view which shows a filter frame. It is a perspective view which shows a ground plane. It is a perspective view which shows the connection part of a top plate and a side plate. It is a perspective view which shows the connection part of a top plate and a side plate, Comprising: A mode when a top plate rotates is shown. It is a top view for showing a groove of a prefilter.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing an air filter of the present embodiment. The air filter 10 includes a filter medium pack 11, a square frame filter frame 12, a casing 13, and a prefilter 14. The filter frame 12 is opened forward and backward, and air is allowed to pass from the front opening 50F toward the rear opening 50B.

  The filter frame 12 includes a left side plate 23 and a right side plate 24 that are arranged in parallel to face each other, a top plate 21 that connects one ends of the side plates 23 and 24 in the top and bottom direction, and a top and bottom direction of the side plates 23 and 24. The top plate 21 and the bottom plate 22 are also arranged in parallel to face each other. In this specification, the direction in which the top plate 21 and the base plate 22 face each other will be described as the top and bottom direction, and the direction in which the both side plates 23 and 24 face each other will be described as the left and right direction.

  The base plate 22 is fixed to the other ends of the side plates 23 and 24 with screws or the like. On the other hand, as will be described later, the top plate 21 is attached to the side plates 23 and 24 so that the front side can be pivoted away from the side plates 23 and 24 around the rear side. The air filter 10 is a filter medium exchange type air filter, and is a filter capable of taking out or inserting the pre-filter 14 and the filter medium pack 11 from the front after the top plate 21 is rotated upward. .

  As shown in FIG. 2, the casing 13 includes an outer frame 17 having a square frame shape opened in the front-rear direction and an attachment frame 18. The outer frame 17 includes a left outer plate 33 and a right outer plate 34 that face each other, a top outer plate 31 that connects one end of each side outer plate 33, 34 in the top-to-bottom direction, and the other in the top-to-bottom direction of both side outer plates 33, 34. An outer plate 32 that connects the ends is provided, and the top plate 31 and the outer plate 32 are also arranged to face each other.

  The attachment frame 18 is provided so as to cover a part of the opening on the rear side of the outer frame 17. The mounting frame 18 is formed in a plate-like flat rectangular frame shape, and its outer edge is connected to the rear end portions 31 </ b> B to 34 </ b> B of the outer plates 31 to 34 and is formed integrally with the outer frame 17. In the square frame-shaped mounting frame 18, a reinforcing bar 18A extending in the left-right direction is spanned between two opposing sides.

  As shown in FIG. 1, the filter frame 12 is disposed inside the outer frame 17. At this time, the top plate 31 and the ground plate 32 are respectively arranged outside the top plates 21 and 22 so as to be parallel to the top plate 21 and the ground plate 22 of the filter frame 12. The left outer plate 33 and the right outer plate 34 are respectively arranged outside the both side plates 23 and 24 so as to be parallel to the left plate 23 and the right plate 24 of the filter frame 12. Each of the plates 31 to 34 is disposed apart from each of the outer surfaces of the plates 21 to 24. Further, the front end portions 31 </ b> F to 34 </ b> F of the outer plates 31 to 34 are respectively arranged on the rear side of the front end portions 21 </ b> F to 24 </ b> F of the plates 21 to 24 of the filter frame 12.

  The filter pack 11 is formed by zigzagging a sheet-like filter medium made of glass fiber, synthetic fiber, nonwoven fabric or the like along the fold line 11A, and is formed in a substantially rectangular parallelepiped shape. The filter pack 11 is not particularly limited, but is, for example, a medium performance filter. The filter media pack 11 is disposed inside the filter frame 12 such that the fold line 11A is along the top-and-bottom direction, and the back surface 11B of the filter media pack 11 is in contact with the front surface 18F of the mounting frame 18. The top, bottom, left, and right end surfaces 11U, 11D, 11L, and 11R of the filter media pack 11 are supported on the inner surfaces of the plates 21 to 24 via sheet-like sealing materials (not shown) having cushioning properties.

  The prefilter 14 is disposed in front of the filter medium pack 11 and attached to the filter frame 12 so as to cover the opening 50F on the front side. The pre-filter 14 has a pre-filter frame 39 having a square frame shape opened in the front and rear, and a pre-filter medium 40 disposed therein, and is formed in a quadrangular shape. Each side of the rectangular pre-filter 14 is configured by frame portions 41 to 44 described later of the pre-filter frame 39, respectively.

  The pre-filter frame 39 includes a front left frame portion 43 and a front right frame portion 44 that extend in the vertical direction and face each other, and a front top frame portion 41 and a front ground frame portion 42 that extend in the left-right direction and face each other. Each of the front top frame portion 41 and the front ground frame portion 42 connects the ends of the front side frame portions 43 and 44 in the top and bottom direction.

  The pre-filter medium 40 is a filter medium having a coarser mesh than the filter medium pack 11 and removes coarse dust and contaminants in the air and prevents them from adhering to the filter medium pack 11. The filter frame 12, the casing 13, and the pre-filter frame 39 are made of metal such as aluminum or galvanized steel, for example.

  As shown in FIGS. 3 to 5, bent portions 22 </ b> S are formed on the rear end portions 22 </ b> B to 24 </ b> B of the base plate 22 and the side plates 23 and 24 by being bent vertically toward the outside of the filter frame 12. ~ 24S are provided. Each of the bent portions 22S to 24S abuts on the front surface 18F (see FIG. 2) of the mounting frame 18, and is fixed to these by bolts 27 or the like.

  The front end 21 </ b> F of the top plate 21 is provided with a plate-like front rising piece 28 that is formed by bending the top plate 21 vertically and rising toward the base plate 22. The front rising plate 28 is provided from the left end portion 21L to the right end portion 21R of the top plate 21 at the front end portion 21F. A front top frame portion 41 of the pre-filter 14 attached to the filter frame 12 is disposed behind the front rising piece 28. The front rising piece 28 is in contact with the front surface of the front top frame portion 41 and presses the front top frame portion 41 rearward to prevent the prefilter 14 from falling off the filter frame 12. The front rising piece 28 is further bent and provided with a protruding piece 28A that protrudes forward from its tip.

  The top plate 21 has a substantially rectangular shape that is long on the left and right. The left and right end portions 21L and 21R of the top plate 21 are provided with plate-like side upright pieces 35L and 35R that are formed by bending the top plate 21 vertically and rising upward. The side upright pieces 35L, 35R are provided along the outer surfaces of the side plates 23, 24. The front sides of the side upright pieces 35L and 35R are cut off, and the front end surfaces of the side upright pieces 35L and 35R are arranged behind the back surface of the front upright piece 28. Therefore, a recess 38 is formed in the top plate 21 by the inner surface of the top plate 21, the back surface of the front upright piece 28, and the front end face of the side upright piece 35L (or 35R). The recess 38 is a space in which a second protrusion 45B of the prefilter 14 described later is disposed.

  As shown in FIGS. 4 and 5, the inner surface of the base plate 22 has a rear portion supporting the filter media pack 11 and a front portion recessed from the portion supporting the filter media pack 11. A groove portion 26 is formed extending in the direction. More specifically, the base plate 22 includes a substantially rectangular flat plate-like support plate portion 19 that is long on the left and right sides, and a U-shaped plate portion 20 that is connected to the front end of the support plate portion 19 and in which a groove portion 26 is formed. . The support plate portion 19 is disposed in parallel to face the top plate 21 and supports the filter media pack 11 by the inner surface thereof.

  The U-shaped plate portion 20 includes first and second side wall plate portions 20 </ b> C and 20 </ b> D that are opposed to each other in the front-rear direction and constitute the side wall of the groove portion 26, and a bottom plate portion 20 </ b> E that constitutes the bottom surface of the groove portion 26. Both side wall plate portions 20 </ b> C and 20 </ b> D are perpendicular to the support plate portion 19, and the bottom plate portion 20 </ b> E is parallel to the support plate portion 19. The U-shaped plate portion 20 is formed, for example, by bending the base plate 22 and is provided from the left end 22L to the right end 22R of the base plate 22. The first side wall plate portion 20C is disposed on the rear side, and the front end 20H thereof is connected to the front end of the support plate portion 19, while the second side wall plate portion 20D is disposed on the front side, The front end 22F is configured.

  As shown in FIG. 4, the support plate part 19 is arrange | positioned in the top-down direction in the position corresponded with the front-end | tip 20G of 2nd side wall board part 20D. However, the support plate portion 19 may be disposed on the top plate 21 side (upper side in FIG. 4) from the tip 20G of the side plate 20D in the top-to-bottom direction. Further, the bottom plate portion 20E is disposed closer to the top plate 21 than the outer plate 32 of the outer frame 17 in the top-to-bottom direction.

  As will be described later, one side (the front ground frame portion 42) of the prefilter 14 is fitted into the groove portion 26. The second side wall plate portion 20D presses the fitted front ground frame portion 42 toward the rear, and prevents the prefilter 14 from falling off the filter frame 12.

  The front end portions 23F, 24F of the side plates 23, 24 are arranged on the rear side of the front rising piece 28 of the top plate 21, and a gap 47 is formed between the front rising piece 28 and the front end portions 23F, 24F. Is done. The gap 47 is a space in which a first protrusion 45A of the prefilter frame 47 described later is disposed. Further, the front end portions 23F and 24F are disposed on the front side from the front end surfaces of the rising pieces 35L and 35R, and the front end portions 23F and 24F are disposed inside the recess 38 when viewed from the side plate 24 side. Further, the front end portions 23F and 24F are disposed on the rear side of the second side wall plate portion 20D of the base plate 22, and the front end portions 23F and 24F are disposed above the groove portion 26 when viewed from the side plate 23 side.

  The both side plates 23 and 24 have a rectangular shape that is long in the vertical direction. The side plates 23 and 24 are not provided with a member projecting inward, and the inner surface thereof is formed by a flat plane. Therefore, when the filter media pack 11 is inserted into the filter frame 12, the insertion is not hindered by the side plates 23 and 24.

  Usually, since the air filter 10 is used in a plurality of grids, the outer frame 17 is attached to the other outer frame 17 with screws, rivets or the like. Accordingly, a plurality of holes 70 for passing rivets and screws are provided in each plate 21 to 24 of each filter frame 12.

  As shown in FIG. 6, the side standing upper pieces 35 </ b> L and 35 </ b> R are provided with fitting recesses 36 that are recessed rearward from the front end surfaces thereof. On the other hand, fitting projections 37 are provided on the outer surfaces of the side plates 23 and 24 near the ends 23U and 24U in the vertical direction so as to coincide with the fitting recesses 36. The fitting protrusion 37 is fitted into the fitting recess 36, thereby restricting the movement of the top plate 21 in the vertical direction. Therefore, the top plate 21 is prevented from rotating unexpectedly even if it receives a slight impact. In a state where the fitting protrusion 37 is fitted in the fitting recess 36, the top plate 21 is arranged in parallel to the support plate portion 19 (hereinafter referred to as a normal position) as described above.

  The side upright pieces 35L and 35R are preferably arranged so as to press the side plates 23 and 24 inward. In this case, the filter media pack 11 and the side plates 23 and 24 are restored to the outside by repelling the pressing, so that the fitting state of the fitting protrusion 37 to the fitting recess 36 is stabilized. Moreover, the sealing performance between the filter media pack 11 and the side plates 23 and 24 can be enhanced.

  The laterally standing upper pieces 35L and 35R are connected to the vicinity of the rear end portions of the left side plate 23 and the right side plate 24 by rivets 49 in the vicinity of the rear end portions thereof. As shown in FIG. 7, the top plate 21 rotates around the rivets 49 (that is, the rear end portion 21 </ b> B side) of the top plate 21 so that the front end portion 21 </ b> F side is separated from the side plates 23 and 24. be able to. However, as shown in FIG. 1, the top plate 21 is provided on the outside (upper) of the top plate 21, so that the range in which the top plate 21 can be rotated is restricted by the top plate 31.

  As shown in FIGS. 1 and 8, L-shaped members 45 </ b> L and 45 </ b> R are connected to the outer peripheral surfaces 43 </ b> S and 44 </ b> S of the front side frame portions 43 and 44 of the prefilter frame 39. The cross-section L-shaped members 45L and 45R are formed integrally with each of the front side frame portions 43 and 44, for example, and are provided from one end to the other end in the vertical direction. As shown in FIG. 8, each of the cross-section L-shaped members 45L and 45R includes a first protrusion 45A that protrudes outward from the outer peripheral surface 43S (or outer peripheral surface 44S), and a tip portion of the first protrusion 45A. It consists of the 2nd protrusion part 45B which protrudes toward back. The cross-section L-shaped members 45L and 45R form grooves 46L and 46R having the first protrusion 45A as the groove bottom surface and the outer peripheral surface 43S or 44S and the second protrusion 45B as the groove side walls. These grooves 46L and 46R extend in the vertical direction and open toward the rear.

  In the pre-filter frame 39, the front ground frame portion 42 is fitted into the groove portion 26 of the ground plate 22, and the front end portions 23F and 24F of the side plates 23 and 24 are inserted into the grooves 46L and 46R of the both front side frame portions 43 and 44. Are attached to the filter frame 12. In the filter frame 12 to which the pre-filter frame 39 is attached, when the top plate 21 is disposed at the normal position, the front top frame portion 41 is disposed behind the front rising piece 28, and the front rising piece 28 is disposed at the front ceiling. The frame 41 is pressed backward. That is, the pre-filter 39 is sandwiched between the front rising piece 28 and the second side wall plate portion 20D, and the front end portions 23F and 24F and the first side wall plate portion 20C, and is fixed to the filter frame 12.

  When the prefilter 14 or the filter media pack 11 is removed from the filter frame 12, first, the front end portion 21F of the top plate 21 is strongly pulled upward, and the fitting projection 37 is extracted from the fitting recess 36. Next, after the top plate 21 is rotated upward so that the front end portion 21F is separated from the side plates 23 and 24 around the rivet 49, the pre-filter 14 and the filter medium pack 12 are removed in order.

  Here, as described above, the front side of the base plate 22 is recessed, and the tip end portion 20G of the second side wall plate portion 20D for pressing the pre-filter 14 has the same height as the inner surface of the support plate portion 19. Placed in position. Therefore, the filter media pack 11 can be taken out of the filter frame 12 by being pulled forward without turning. When the filter medium pack 11 is taken out, the top plate 21 is rotated upward, so that the front rising piece 28 does not hinder the extraction of the filter medium pack 11. The same applies when the filter media pack 11 is inserted into the filter frame 12.

  As described above, in the present embodiment, the front rising piece 28 for pressing the prefilter 14 and the first side wall plate portion 20 </ b> D do not hinder the loading / unloading of the filter media pack 11 into the filter frame 12. . Therefore, in this embodiment, the workability | operativity of filter media pack 11 replacement | exchange can be improved.

  In the present embodiment, when the pre-filter 14 is attached to the both side plates 23 and 24, the side plates 23 and 24 of the filter frame 12 are not easily bent right and left, and the strength of the filter frame 12 is improved. Moreover, it is preferable that the both side plates 23 and 24 are arranged so as to be pressed inward by the cross-sectional L-shaped members 45L and 45R of the prefilter. According to such a structure, the sealing performance between the filter media pack 11 and the side plates 23 and 24 can also be improved.

  On the other hand, when the filter medium pack 11 is replaced, the side plates 23 and 24 are relatively bent in the left-right direction by removing the prefilter 14 from the filter frame 12, so that the filter medium pack 11 can be relatively easily moved. It can be inserted and removed between the side plates 23 and 24.

  In this embodiment, the top plate 21 may be rotated so that the front side is separated from the side plates 23 and 24, and may be connected to the side plates 23 and 24 by hinges or the like instead of rivets. In the present embodiment, the side upright pieces 35L and 35R of the top plate 21 may be provided with holes for fitting the fitting protrusions 38 in place of the recesses. Further, the holes may be provided in the side plates 23 and 24, and protrusions for fitting into the holes may be provided on the inner surfaces of the rising pieces 35L and 35R.

DESCRIPTION OF SYMBOLS 10 Air filter 11 Filter medium pack 12 Filter frame 14 Pre filter 19 Support plate part 20 U-shaped plate part 20C 1st side wall board part 20D 2nd side wall board part 21 Top plate (top frame part)
22 Ground plate (ground frame)
23 Left side plate (left side frame)
24 Right side plate (right side frame)
26 Groove part 28 Front rising piece (front rising part)
39 Pre-filter frame 40 Pre-filter medium 41 Front top frame portion 42 Front ground frame portion 43 Front left frame portion 44 Front right frame portion

Claims (7)

A square frame that is open at the front and rear, both side frame portions facing each other, a filter frame composed of a top frame portion and a ground frame portion facing each other,
Supported on the inner surfaces of the both side frame parts, the top frame part and the ground frame part, and the filter medium disposed inside the filter frame,
A pre-filter disposed on the front side of the filter medium,
On the inner surface of the ground frame portion, a portion on the front side than the portion supporting the filter medium is recessed, and a groove portion extending in a direction in which the both side frame portions face each other is formed,
The air filter according to claim 1, wherein the pre-filter has a quadrangular shape, and one side of the pre-filter is fitted into the groove portion and attached to the filter frame.   The ground frame part is a support plate part that faces the top frame part and supports the filter medium pack, and a U-shaped plate part that is connected to the front end of the support plate part and in which the groove part is formed. The air filter according to claim 1, comprising: The U-shaped plate portion comprises a bottom plate portion that constitutes a bottom surface of the groove portion, a side wall of the groove portion, and both side wall plate portions that face in the front-rear direction,
3. The air filter according to claim 2, wherein the support plate portion is disposed at a position that coincides with a front end of the side wall plate portion on the front side in the top-to-bottom direction, or closer to the top frame portion side than the front end. The top frame part is rotatable so that the front side is separated from the both side frame parts around the rear side,
The front end portion of the top frame portion is provided with a front rising portion raised toward the ground frame portion,
The other side of the pre-filter is arranged behind the front upright,
The air filter according to claim 1, wherein the front rising portion presses the pre-filter backward. The pre-filter is a square frame that is open at the front and rear, and includes a front-side frame portion that faces each other, a pre-filter frame that includes a front top frame portion and a front ground frame portion that face each other, and the pre-filter A pre-filter medium disposed inside the frame,
2. The pre-filter according to claim 1, wherein the front ground frame portion is fitted into the groove portion, and both the front side frame portions are attached to front end portions of the both side frame portions, respectively. Air filter. The both side frame portions are both side plates facing each other,
The air filter according to claim 5, wherein a front end portion of each of the both side plates is fitted to each of the both front side frame portions.   The air filter according to claim 6, wherein a groove is provided in each of the both front side frame portions, and a front end portion of each of the side plates is fitted in the groove.

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