JP2007185638A - Bag filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a holding member of a bag filter economical and at the same time reliably maintain the holdability of a filter medium and make the holding member disposable together with the filter medium. <P>SOLUTION: The aperture parts of a filter medium 1 are made to have a plurality of rectangularly opened apertures arranged in series in one direction and a holding member 2 for holding the aperture parts of the filter medium 1 as the aperture parts being opened as they are is composed of an outer frame part 2a for engaging the outer peripheral rim of the filter medium 1 including all of aperture parts and crosspiece parts 2b for supporting the filter medium 1 from the rear face side between neighboring aperture parts. The holding member 2 is made by corrugating a single thick sheet of paper, so that the holding member 2 can be economical and reliable for maintaining the filter medium 1 and disposable together with the filter medium 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bag filter for gas.

  Bag filters are used for exhaust openings and dust collectors such as paint booths where the air is heavily contaminated. ing. In many cases, the bag filter is easily contaminated with a filter medium, and its replacement cycle is relatively short.

  As a holding means for such a bag filter, each of the openings of the filter medium is formed by an inner frame provided on a retainer inserted into a plurality of bag-shaped filter media and an outer frame provided on a support plate attached to the housing. There is one in which a filter medium is held on a support plate together with a retainer by being sandwiched from inside and outside (see, for example, Patent Document 1). In the one described in Patent Document 1, a plurality of outer frames are arranged in one direction on a support plate, a plurality of filter media and retainers are held on each outer frame, and an outward flange of each retainer is a common pressing member. I'm trying to press. Moreover, the opening part of each filter medium can be opened in an ellipse shape.

  In the bag filter holding means described above, the support plate and the retainer are each provided with an inner frame body and an outer frame body that sandwich the opening of the filter medium from inside and outside, and the outward flange of each retainer is pressed against the outer frame body. Since the pressing member to be provided is provided, the configuration is very complicated. In order to make the holding means for such a bag filter simple and to make it easy to attach and detach the filter medium, the present invention has a rectangular shape in which one or more openings of the filter medium are continuous in one direction. A holding member that opens and holds the opening, a frame member that supports each opening of the filter medium in a rectangular shape from the back side, and a frame member that is fitted into the frame member from the front side of the filter medium. And a frame lid member that clamps at least the outermost peripheral portion of the filter medium opening (Japanese Patent Application No. 2003-193286).

Japanese Patent Laid-Open No. 7-31818 (pages 2-5, FIGS. 2, 5-6)

  As described above, since the filter medium is easily contaminated for use in the bag filter and its replacement cycle is relatively short, recently, in order to eliminate the need to attach / detach the dirty filter medium to / from the holding member, the holding member is attached together with the filtering medium. It is desired to make it disposable. However, since the holding member of the bag filter such as the support plate and the retainer described above is formed of a metal material or a plastic material, there is a problem that it cannot be disposed of together with the filter medium. Moreover, the holding member formed of a metal material or a plastic material is too expensive to be disposable.

  Accordingly, an object of the present invention is to make the holding member of the bag filter inexpensive while ensuring the holding ability of the filter medium, and to dispose it together with the filter medium.

  In order to solve the above-described problems, the present invention provides a bag filter in which an opening of a filter medium formed of a flexible material in a bag shape is held in a predetermined shape, and the filter medium has one or more openings. A holding member that opens and holds the opening of the filter medium as a plurality of one-direction continuous rectangular openings, and an outer frame portion that locks the outer peripheral edge of the filter medium including all the openings, In the case where a plurality of openings are connected, a configuration is adopted in which the holding member is formed by bending a piece of thick paper, with a crosspiece supporting the filter medium from the back side between adjacent openings.

  That is, it is assumed that one or a plurality of openings of the filter medium can be opened in a rectangular shape in a single direction, and the holding member that opens and holds the openings of the filter medium includes the outer peripheral edge of the filter medium including all the openings. When there are a plurality of openings, the outer frame part that locks the belt and a crosspiece that supports the filter medium from the back side between the adjacent openings, this holding member is folded of a piece of cardboard By forming by processing, the holding member is made inexpensive while securing the filter medium, and can be disposed of together with the filter medium.

  By forming a cross section that supports a filter medium from the back side between adjacent openings when the openings are connected to each other in a three-dimensional cross-sectional shape by bending the cardboard, the wind pressure of the air flowing from the openings is reduced. The bending rigidity of the receiving crosspiece can be ensured.

  By attaching a cardboard reinforcing plate along the outer periphery of the filter medium, the outer periphery of the filter medium can be firmly locked to the outer frame portion.

  By making all the inner and outer directions of the folding of the single thick paper the same, folding lines for folding can be easily put into the thick paper from one direction.

  The bag filter of the present invention includes all the openings as holding members that open and hold the openings of the filter medium, assuming that one or more of the openings of the filter medium are opened in a rectangular shape. The outer frame portion that locks the outer peripheral edge of the filter medium, and when there are a plurality of openings, the frame includes a crosspiece that supports the filter medium from the back side between the adjacent openings. Since the cardboard is formed by bending a thick sheet of paper, the holding member can be made inexpensive while securing the filter medium, and can be disposed of together with the filter medium.

  In the case where a plurality of the openings are connected, a crosspiece that supports the filter medium from the back side between adjacent openings is formed into a three-dimensional cross-sectional shape by bending a cardboard to receive the wind pressure of air flowing in from the openings. The bending rigidity of the crosspiece can be ensured.

  By attaching a cardboard reinforcing plate along the outer periphery of the filter medium, the outer periphery of the filter medium can be firmly locked to the outer frame portion.

  By making all the inner and outer directions of the folding of the single thick paper the same, folding lines for folding can be easily put into the thick paper from one direction.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the bag filter includes a bag-shaped filter medium 1 that is formed of a non-woven fabric and has a plurality of openings continuous in one direction and opened in a rectangular shape, and all openings. Made of cardboard attached to the outer peripheral edge of the filter medium 1, a holding member 2 composed of an outer frame portion 2 a that locks the outer peripheral edge of the filter medium 1, a crosspiece 2 b that supports the filter medium 1 from the back side between adjacent openings. And a reinforcing plate 3. Although not shown, in this bag filter, the holding member 2 is attached to an exhaust port or the like, and dirty air flows from the opening of the filter medium 1 and is filtered.

  As shown in FIG. 3, the holding member 2 is formed of a single cardboard, and the outer frame portion 2a on the outer periphery and the crosspiece portions 2b on the inner side thereof have the same crease lines 4 for bending, which will be described later. It is put on one side. Also, a plurality of claws 5a and 5b are provided on the outer side edge of the outer frame part 2a and both side edges of each crosspiece part 2b, respectively, at the inner peripheral part of the outer frame part 2a and the central part of each crosspiece part 2b. Are provided with a plurality of slit holes 6a, 6b into which the claws 5a, 5b are inserted after bending. As shown in FIG. 2, the outer peripheral edge of the filter medium 1 and each reinforcing plate 3 are also provided with a plurality of slit holes 1a and 3a into which the claws 5a of the outer frame portion 2a are respectively inserted.

  As shown in FIG. 4, the outer frame portion 2 a of the holding member 2 is bent inwardly into a rectangular cross-section along three crease lines 4, and each claw 5 a provided on the outer edge is Through the slit hole 1a on the outer peripheral edge of the filter medium 1 and the slit hole 3a on the reinforcing plate 3, the outer peripheral edge of the filter medium 1 inserted into each slit hole 6a and sewn to the reinforcing plate 3 with the thread 7 is the reinforcing plate. 3 is locked to the outer frame portion 2a. Although illustration is omitted, the outer frame portion 2 a orthogonal to the outer frame portion 2 a in FIG. 4 is similarly bent so that the outer peripheral edge of the filter medium 1 is locked via the reinforcing plate 3.

  Further, each crosspiece 2b of the holding member 2 is bent inwardly into a right triangle cross section along two crease lines 4 on both sides of the central portion thereof, and each claw provided on both side edges. 5b is inserted into each slit hole 6b provided in the center from above. Therefore, each crosspiece 2b is formed in a three-dimensional cross-sectional shape with two right-angled triangles back to back, so that sufficient bending rigidity can be ensured even under the wind pressure of air flowing from each opening of the filter medium 1. Yes.

  FIG. 5 shows a modification of the locking method of the outer peripheral edge of the filter medium 1 shown in FIG. In this modification, there is no slit hole 1a on the outer peripheral edge of the filter medium 1, and each claw 5a provided in the outer frame portion 2a of the holding member 2 passes through only the slit hole 3a of the reinforcing plate 3 and each slit hole of its own. The outer peripheral edge of the filter medium 1 inserted into 6a and sewn to the reinforcing plate 3 with the thread 7 is along the inner peripheral surface of the outer frame portion 2a that is bent.

  In the above-described embodiment, one cardboard is folded so that the outer frame portion of the holding member has a rectangular cross-sectional shape and each crosspiece portion has a cross-sectional shape in which two right triangles are back to back. The cross-sectional shape of the frame portion and the crosspiece portion is not limited to that of the embodiment, and can be an arbitrary bent shape. In addition, the bag filter according to the present invention can be applied to a filter medium that has only one opening of the filter medium and has no crosspiece in the holding member.

External perspective view showing an embodiment of a bag filter 1 is an exploded perspective view of FIG. FIG. 1 is a developed plan view of the holding member of FIG. Sectional view along line IV-IV in FIG. Sectional drawing which shows the modification of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Filter medium 1a Slit hole 2 Holding member 2a Outer frame part 2b Crosspiece part 3 Reinforcement board 3a Slit hole 4 Crease line 5a, 5b Claw 6a, 6b Slit hole 7 Yarn

Claims (4)

  A bag filter in which an opening of a filter medium formed of a flexible material in a bag shape is held in a predetermined shape, and the filter medium has one or more openings in one direction and can be opened in a rectangular shape. As the holding member that opens and holds the opening of the filter medium, the outer frame portion that locks the outer peripheral edge of the filter medium including all the openings, and when the opening is connected to a plurality of openings, adjacent openings A bag filter characterized in that it comprises a crosspiece that supports a filter medium from the back side between the sections, and this holding member is formed by bending a piece of cardboard.   2. The bag filter according to claim 1, wherein when a plurality of the openings are connected, a crosspiece that supports a filter medium from the back side between adjacent openings is formed into a three-dimensional cross-sectional shape by bending the cardboard.   The bag filter according to claim 1 or 2, wherein a reinforcing plate made of cardboard is attached along an outer peripheral edge of the filter medium.   The bag filter according to any one of claims 1 to 3, wherein all the inner and outer directions of the folding of the single cardboard are the same.

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