JP2018103112A - Filter unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further stably maintain even an arrangement pitch of a pleat of a filter material, by restraining leak from the filter material outer periphery of gas without using a cutoff material, in a filter unit having the pleat-processed filter material.SOLUTION: A filter unit 1 is constituted of a pleat-processed filter material 2 and an outer frame 3 for constituting respective ones of upper-lower horizontal frames 3a and left-right vertical frames 3b out of a material of folding up a band plate in two in the width direction. The filter material 2 disappears in a pleat by flatly crushing a peripheral edge part 2b of two places on the side along the juxtaposing direction of the pleat 2a, and holds the filter material 2 by the outer frame 3 by sandwiching the whole area of the peripheral edge part 2b of the two places and a peripheral edge part 2c of the originally flat other two places in a space between folding-up surfaces of the band plate of the horizontal frames 3a and the vertical frames 3b.SELECTED DRAWING: Figure 2

Description

  The present invention is a filter unit comprising a pleated filter medium, in particular, has a simple structure, can be easily attached to an exhaust port, an outside air intake port, an air outlet, etc., and does not require a large space, In addition, the present invention relates to a filter unit that prevents leakage of gas to be filtered from the outer periphery of the filter medium without using a blocking material.

  In filter units for dust removal or oil mist collection with filter media that has been pleated to increase the collection area inside the outer frame, the mat between the filter media and the outer frame is blocked by a mat or adhesive. The method of packing the material is taken.

  By blocking the flow of the gas to be filtered with a blocking material, the gas before filtering was prevented from leaking downstream from the ends of the pleat valley of the filtering medium through the gap between the filtering medium and the outer frame. is there.

  In addition, if the pleated filter media vary in pleated pitch, the gas passage resistance in each part of the filter media will not be stable and the collection performance will be unstable. Japanese Patent Application Laid-Open No. H11-228707 proposes a structure that maintains the pitch of the pleats by inserting both ends of the pleats into the recesses of the stabilizer.

  In addition, a structure in which the arrangement pitch of the pleats is maintained without using a stabilizer has been proposed by the present applicant (see Patent Document 2 below).

  The filter unit of Patent Document 2 is for collecting oil mist, and a lifter is provided that supports the filter medium from below and floats up from the groove bottom of the lower horizontal frame member of the outer frame. By providing a notch for receiving a mountain and an interval holding member inserted into the valley of the pleat, the interval between the pleats can be maintained without impeding the flow of the collected oil.

JP-A-6-343804 JP 2004-61467 A

  In the filter of Patent Document 1, the number of components (the number of parts) increases due to the installation of the stabilizer. In addition, because of the structure, an outer frame having a somewhat large depth dimension is required, so that it is troublesome to attach to the exhaust port, the outside air intake port, the air outlet port, and the like, and the installation space becomes large.

  In addition, when the arrangement pitch of the pleats of the filter medium and the prevention of gas leakage from the gap between the filter medium and the outer frame are required in addition to the stabilizer, a mat, an adhesive, etc. However, it is difficult to obtain a satisfactory leak preventing effect because the gap is not sufficiently filled with the blocking material.

  Since the filter unit of Patent Document 2 is provided with a lifter, the number of components is increased as in the filter of Patent Document 1, and a space for mounting a large outer frame is also required.

  In addition, this filter unit also needs to be used in combination with a blocking material that fills the gap between the outer frame and the filter medium when holding the arrangement pitch of the pleats of the filter medium and preventing gas leakage are required. Regarding prevention of leakage of gas to be filtered, it is difficult to obtain a satisfactory effect as in the filter of Patent Document 1.

  In view of this, the present invention provides a filter unit having a pleated filter medium that has a simple structure and can be easily attached to an exhaust port, an outside air intake port, an air outlet, etc. without requiring a large space. In addition, an object of the present invention is to prevent leakage of gas to be filtered from the outer periphery of the filter medium without using a blocking material.

In order to solve the above problems, in the present invention, the filter unit is configured as follows.
That is, it comprises a pleated filter medium and a rectangular outer frame surrounding the outer periphery of the filter medium, and each of the outer frames is composed of upper and lower horizontal plates each made of a material obtained by folding a band plate into two in the width direction. A structure in which the frame and the left and right vertical frames are combined in a direction in which the space between the folded surfaces of the band plate is opened to the inside of the frame,
The filter medium is flattened at the two peripheral portions on the side along the direction in which the pleat waves are aligned, and the two peripheral portions where the pleats disappeared by the flattening, and the other flat portions that are not flattened. The entire area of the two peripheral edges was sandwiched in the space between the folding surfaces of the strips of the horizontal frame and the vertical frame, and the filter medium was held by the outer frame.

  The filter medium of such a filter unit may be a resin mesh demister, filter paper, resin fiber or vegetable fiber non-woven fabric, and the like for the purpose of trapping airborne dust.

  In addition, the purpose of collecting oil diffused in the air is a metal mesh demister in which a plurality of sheets are laminated, a metal nonwoven fabric in which a plurality of sheets are laminated, or a metal mesh demister and a metal nonwoven fabric. What comprised the laminated combination is preferable.

  When the outer frame is made of a metal frame, it is preferable that the outer frame does not loosen the clamping force of the periphery of the filter medium, but the outer frame is made of a resin outer frame or a cardboard made of waterproofing and surface strengthening. It is also possible to use an outer frame.

  In the case of a disposable filter unit, an outer frame formed of resin or cardboard is more economical and preferable than metal.

  In the filter unit of the present invention, the peripheral edge of the filter medium is flattened on the side along the direction in which waves of the pleats are arranged, and the entire periphery including the two peripheral edges where the pleat has disappeared by the processing is the material of the outer frame. The filter medium is held by the outer frame by being sandwiched in the space between the folded surfaces.

  For this reason, there is no gap through which gas passes between the filter medium and the outer frame, and it is possible to prevent gas leakage before filtration even if the passages are not blocked with a blocking material.

  Those that use barriers to suppress leakage are difficult to evenly block the pleat waves. On the other hand, the filter medium employed in the present invention closes the passage (gap between the waves) through which the pleats disappear and the gas leaks at the peripheral portion crushed flat. For this reason, an effect superior to that using a blocking material can be expected for preventing leakage.

  In addition, in the location where the pleat disappears by being flattened on the periphery of the filter medium, the size of the filter medium becomes finer than before the filter medium is crushed, and the flow resistance of the gas is increased. For this reason, most of the gas passes through a region where the pleats are not crushed, thereby improving the collection efficiency of dust, oil mist, and the like.

  Further, the filter media itself has a function of maintaining the pitch of the pleat wave by flattening the two peripheral portions on the side along the direction in which the waves of the pleats of the filter medium are arranged. For this reason, the pitch of the pleat wave can be stably maintained without using a stabilizer or the like.

  In addition, the filter unit of the present invention is configured by two members, an outer frame and a filter medium, and has a simple structure and can be made inexpensively. In addition, since the outer frame is flat, the installation space for the exhaust port, the outside air intake port, the air outlet port, etc. can be reduced.

  In addition, when attaching to the exhaust port, outside air intake port, air outlet, etc., the outer frame can be screwed directly around the exhaust port, outside air intake port, air outlet, etc. with a screw, dropped into a groove, or held with a stopper. You can easily do it.

It is a perspective view which shows an example of the filter unit of this invention. It is a perspective view which decomposes | disassembles and shows a part of filter unit of FIG. It is sectional drawing along the III-III line of FIG. It is sectional drawing along the IV-IV line of FIG. It is a disassembled perspective view which shows an example of a filter medium. It is a perspective view which shows the state before crushing one side of the area | region (peripheral part) crushed flatly of a filter medium. It is a perspective view which shows an example of use of the filter unit of this invention. It is a perspective view which shows the other usage example of the filter unit of this invention. It is a perspective view which shows the other usage example of the filter unit of this invention. It is sectional drawing which shows the further another example of use of the filter unit of this invention.

  Embodiments of a filter unit according to the present invention will be described below with reference to FIGS.

  The illustrated filter unit 1 includes a filter medium 2 and a rectangular outer frame 3 that surrounds the outer periphery of the filter medium.

  The filter medium 2 is made of metal, resin, paper, and the like, and is pleated so as to have a predetermined wrinkle (wave) height and a predetermined wrinkle arrangement pitch, which is larger than a flat filter medium. Has a collecting area.

  The filter medium 2 employed in the illustrated filter unit is composed of a metal mesh demister, but may be composed of non-woven fabric such as metal fiber, resin fiber, or vegetable fiber, or may be composed of fibers of different materials. A combination of the formed nonwoven fabrics may also be used.

  For the purpose of collecting dust, the filter medium 2 can also be of a single-layer structure. However, for the purpose of collecting oil mist, several filters with different eye roughness are available. It is preferable to use a filter medium having a combined multilayer structure.

  The illustrated filter unit 1 can be used for both dust collection and oil mist collection. The entire filter unit 1 including the outer frame 3 is made of metal and can be used repeatedly by washing. It has become.

Filter medium 2 employed in the filter unit 1 of this example is As shown in FIG. 5, a coarse two metal mesh demister 2 _-1, 2 a fine metal between _-1 mesh demister _2-2 Is sandwiched between them.

Coarse metal mesh demister 2 _-1 used here, 16 mesh, a fine metal mesh demister 2 _-2 is a 200 mesh, but is not limited to this combination.

  A filter unit for collecting oil tends to accumulate oil collected on the filter medium on the outlet side of the filter (downstream of the gas flow), so a plurality of mesh demisters are used in layers. Sometimes, the downstream filter medium should be coarse.

  On the other hand, when using several layers of filter media with different mesh sizes for filter units intended to collect only dust, the filter media on the downstream side should have a smaller mesh size to prevent clogging. Is good.

  The outer frame 3 is composed of upper and lower horizontal frames 3a and 3a and left and right vertical frames 3b and 3b made of a material obtained by folding a strip of stainless steel or the like in the width direction between the folded surfaces of the strip. The space is combined in a direction that opens to the inside of the frame.

  The outer frame 3 may join the butted portions of the horizontal frame 3a and the vertical frame 3b. However, when the material band plate is stainless steel or copper alloy having a high shape retention ability, the material band plate The rim of the filter medium 2 can be inserted between the fold-up surfaces, and the rim can be sandwiched between the fold-up portions of the band plate.

  In the case of the structure, if the filter medium 2 has sufficient strength, the horizontal frame 3a and the vertical frame 3b can be connected via the filter medium 2 to hold the shape of the outer frame 3, and the horizontal frame 3a and the vertical frame 3b can be maintained. Joining the frames 3b to each other is no longer an essential matter.

  The filter medium 2 is crushed by pressurizing two peripheral portions 2b on the side along the direction in which the pleats 2a are arranged with a press or the like. As shown in FIG. 2, the peripheral edge 2b is flattened as shown in FIG. In addition, the crushing process of the pleat 2a in the peripheral part 2b is made so that the arrangement pitch P (refer FIG. 4, FIG. 6) of the pleat 2a is maintained.

  The other two peripheral portions 2c of the filter medium 2 are not pleated and are flat from the beginning.

  As shown in FIGS. 3 and 4, the outer frame 3 is formed by the entire area of the two peripheral portions 2 b crushed and disappeared in this way and the other two peripheral portions 2 c (only one is shown). The filter medium 2 and the outer frame 3 are fixed to each other by being sandwiched between the folding surfaces of the strips of the horizontal frame 3a and the vertical frame 3b.

  In addition, in order to suppress the reduction | decrease in the effective collection area of a filter medium, the area | region A (refer FIG. 3, FIG. 6) which crushes the peripheral part 2b is only with the area | region pinched | interposed into the outer frame 3, as shown in FIG. It is good to do.

  As described above, when the peripheral edge 2b that has been flattened and the pleats 2a disappeared and the other two peripheral edges 2c that are originally flat are sandwiched between the folded surfaces of the material (band) of the outer frame 3, Is not created between the filter medium 2 and the outer frame 3.

  Therefore, it is possible to prevent gas leakage without using a blocking material. In addition, since both ends of the pleat wave are crushed, the filter medium 2 itself has a function to hold the pitch of the pleat wave, so that the pitch of the pleat wave can be stably held without using a stabilizer or the like. Is possible.

  7-10 show an example of the use of the filter unit of the present invention. In FIG. 7, the filter unit 1 is attached to the exhaust port 4 from the room such as a factory, and in FIG. 8, the filter unit 1 is attached to the outside air intake 5 to the room such as the factory.

  In FIG. 9, the filter unit 1 is attached to the air outlet 7 of the air conditioning duct 6 installed indoors.

  The filter unit 1 is attached to the wall surface or the entrance / exit of the air duct by screwing the outer frame 3 to the wall surface, or by fitting the outer periphery of the outer frame 3 in a holding groove formed in an outlet or an outside air intake port. Or a method of tightening and holding the outer frame 3 with a clamp or a clip provided at a mouth portion such as an exhaust port or an outside air intake port.

  Unlike the conventional filter unit outer frame formed of channel material or angle material, the filter unit of the present invention has a small thickness of the outer frame 3, and therefore is not subject to installation restrictions. As shown in FIG. The air-conditioning duct 6 can be used by being inserted in the middle of the longitudinal direction.

DESCRIPTION OF SYMBOLS 1 Filter unit 2 Filter medium 2 _- Coarse mesh demister 2 _- Fine mesh demister 2-2 pleat 2b Peripheral part 2c which flattened and disappeared pleat 2c Peripheral part 3 which is not pleated Outer frame 3a Horizontal frame 3b Vertical frame 4 Exhaust port 5 Outside air intake port 6 Air-conditioning duct 7 Air outlet A Area where the periphery of the filter medium is crushed

Claims (3)

A filter unit for collecting dust or oil mist comprising a pleated filter medium (2) and a rectangular outer frame (3) surrounding the outer periphery of the filter medium, each of the outer frames (3) The upper and lower horizontal frames (3a) and the left and right vertical frames (3b), which are made of a material obtained by folding the band plate into two in the width direction, have a space between the folded surfaces of the band plate inside the frame. It has a structure that is combined in the opening direction,
The filter medium (2) is flattened at two peripheral portions on the side along the direction in which the pleats are arranged, and is provided with two peripheral portions (2b) where the pleat has disappeared by the crushing process, and pleats. The entire area of the other two peripheral portions (2c) that are not originally flat are sandwiched between the space between the horizontal frame (3a) of the outer frame (3) and the folding surface of the strips of the vertical frame (3b). A filter unit in which the filter medium (2) is held by the outer frame (3).   The filter medium (2) is composed of a metal or resin mesh demister in which a plurality of sheets are laminated, a metal fiber, a resin fiber or a vegetable fiber nonwoven fabric in which a plurality of sheets are laminated, or a laminate combination of the mesh demister and a nonwoven fabric. The filter unit according to claim 1.   The filter unit according to claim 1 or 2, wherein the outer frame (3) is formed of metal, resin, or cardboard that has been subjected to waterproofing treatment and surface strengthening treatment.

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