JP2006320858A - Filter for dust collection - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter for dust collection preventing breakage of filter cloth body and drawing out of a scrim. <P>SOLUTION: This filter for dust collection is used for a pulse-jet type dust collector, comprising a filter cloth attaching part and a filter cloth body, with a folding part formed by folding an upper end part of the filter cloth body jointed to a lower end part of the filter cloth attaching part. One folding type is preferable for the folding part considering working efficiency. Folding may be toward inside or outside. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a dust collecting filter. More specifically, the present invention relates to a dust collection filter used in a pulse jet dust collector.

  2. Description of the Related Art Conventionally, a dust collector that filters dust from air containing dust (dust) and converts it into clean air has been used to improve the working environment. As such a dust collector, for example, a plurality of filters arranged on a cell plate arranged in a cabinet, a header pipe for supplying compressed air fixed to the cabinet, a valve section and a J bend are provided on the header pipe. There is a pulse jet type dust collector including a manifold that is connected through a plurality of nozzles and a plurality of nozzles that are provided in the manifold.

  In this pulse jet type dust collector, the filter is arranged corresponding to each nozzle. Also, in this dust collector, dust adheres to the filter as it is used, and accumulates and dust collection performance deteriorates. Therefore, high-temperature compressed air is periodically sent to the header pipe, J bend, and manifold. After that, the dust is blown off from the nozzle into the inside of the filter (back washing).

  In addition, the shape of the filter is appropriately selected such as a cylindrical shape or a substantially star-shaped cross section in consideration of the type of dust, dust collection efficiency, maintenance, and the like, and the mounting structure is also appropriately selected. For example, in the case of a cylindrical filter, it is composed of a filter cloth attachment mouth portion and a filter cloth main body that is sewed over the lower portion of the mouth portion, and the filter cloth attachment mouth portion is a plate having a hole. By attaching to the cell plate, the filter cloth body is attached so as to hang (see Non-Patent Document 1).

Japan Powder Industrial Technology Association, "Dust Collection Technology and Equipment", Nikkan Kogyo Shimbun

  Since it is difficult to manufacture the filter cloth attachment port base part and the filter cloth main body integrally with the filter, after the filter cloth attachment port base part and the filter cloth main body are manufactured separately, the filter cloth main body is used in the final step. It is sewn to the bottom of the filter cloth attachment port.

  The filter cloth attachment port base part is subject to the weight of the filter cloth body itself and the collected dust. In addition, an impact force by compressed air is applied during backwashing, so that the filter cloth attachment port part and the filter cloth body are sewn together. Since the force (bonding force) is weak, there is a problem that the filter cloth body is torn at the stitched portion.

  Further, as the filter, particularly a high-temperature gas filter needs heat resistance, polytetrafluoroethylene (PTFE) is applied to a scrim composed of a warp and weft lattice held in place by an adhesive at the intersection of the yarns. Nonwoven fabric using

  However, since the polytetrafluoroethylene has a low coefficient of friction, if the stitching width (joint portion) of the filter cloth body is short, it is caused by the weight of the filter cloth body and the weight of collected dust, the impact force of compressed air, etc. There is a problem that the scrim is easily pulled out by a tensile force.

  Therefore, in view of the above circumstances, an object of the present invention is to provide a dust collecting filter that can prevent the filter cloth body from being broken and the scrim from coming off.

  The dust collection filter of the present invention is a dust collection filter comprising a filter cloth attachment port base part and a filter cloth main body, which is used in a pulse jet dust collector, and is formed by folding the upper end of the filter cloth main body. A part is joined to the lower end part of the said filter cloth attachment port base part, It is characterized by the above-mentioned.

  According to the present invention, since the folded portion of the filter cloth main body is overlapped and joined to the filter cloth attachment port base portion, the stitching force between the filter cloth attachment port base portion and the filter cloth main body can be increased. For this reason, since it has the same strength as a filter in which the filter cloth body and the filter cloth attachment port base part are integrally manufactured, it is possible to prevent the filter cloth body from being broken and the scrim from coming off.

  The dust collection filter of the present invention will be described below with reference to the accompanying drawings.

  The dust collection filter of the present invention can be applied to, for example, a pulse jet dust collector provided in factory equipment in order to remove components such as dust and nitrogen oxides in exhaust gas generated from a garbage incinerator. This pulse jet type dust collector includes a plurality of dust collecting filters arranged on a cell plate disposed in a cabinet, a header pipe for supplying compressed air fixed to the cabinet, a valve section on the header pipe, and A manifold is connected via a J-bend, and at least a plurality of nozzles provided in the manifold. Further, when removing nitrogen oxides, it is preferable to appropriately dispose denitration means, ammonia addition means, and the like.

  In the pulse jet type dust collector, in order to improve dust collection performance (dust collection efficiency) by removing dust adhering to the filter cloth body of the dust collection filter by dust collection operation, Compressed air is blown regularly.

  As shown in FIG. 1, a dust collection filter A according to an embodiment of the present invention is configured by a filter cloth attachment port base 1 and a filter cloth body 10.

  The filter cloth attachment port base portion 1 is a portion that is fitted and fixed to the hole edge portion of the cell plate, folds the lower end 3 so as to form a convex portion on the upper end portion 2, and It comprises a mouth body 5 having an annular recess 4 formed on the outer periphery, and a packing 6 and a snap ring 7 held by the protrusion. Further, a joining width is secured at the lower end portion 3. The arrangement (seam) of the threads 8 in this joining width can be selected as appropriate in the present invention in order to improve the joining force (sewing force) with the filter cloth body 10, but this embodiment Then, the number of stitches in the circumferential direction of the filter cloth attachment port base 1 is arranged in four. The packing 6 and the snap ring 7 are held in order to prevent the filter cloth from coming out of the cell plate hole and to make the cell plate hole and the filter cloth adhere to each other. The annular recess 4 is fitted and fixed to the hole edge of the cell plate.

  The filter cloth body 10 has a folded portion 12 formed by folding the upper end portion 11 outward. The folded portion 12 can be formed by being folded into a plurality of pieces, but is preferably folded into one in consideration of workability and the like. The filter cloth body 10 is attached in a state where it is sewn with a thread 8 and hangs on the filter cloth attachment port base 1 after the folded portion 12 is overlapped with the lower end 3 of the filter cloth attachment port base 1. As the type of the yarn 8, polytetrafluoroethylene (PTFE), polyester, glass, celmec, heat resistant nylon, or the like can be used.

  Further, the present invention is not limited to the dust collection filter A having the folded portion 12 formed by folding the upper end portion 11 of the filter cloth body 10 outward, as shown in FIG. The filter B for dust collection can be formed as the folded portion 33 formed by folding the upper end portion 32 of the filter cloth body 31 inward.

  In addition, although the filter cloth main bodies 10 and 31 in the filters A and B for dust collection of the above embodiment have a cylindrical shape, the present invention is not particularly limited to this, and the cross section is substantially a star shape. Or an appropriate shape such as an envelope type. When a shape other than a cylinder is adopted as the shape of the filter cloth main body, the shape of the lower end portion of the filter cloth attachment port base is appropriately selected according to the shape of the filter cloth main body.

  Further, in the present invention, the material of the filter cloth body in the dust collection filters A and B is not particularly limited, and a nonwoven fabric, polyester fiber, cotton, which uses polytetrafluoroethylene (PTFE) as a scrim, Polypropylene, polyacrylonitrile, aliphatic polyamide, aromatic polyamide, polyphenylene sulfide, glass or the like can be appropriately selected.

  Furthermore, in the above embodiment, the folded portion of the filter cloth main body and the lower end portion of the filter cloth attachment port base portion are joined by stitching (sewing), but the present invention is not limited to this, for example, A combination of stitching and adhesive, or a separate reinforcing material may be used.

  As described above, according to the present invention, since the folded portion of the filter cloth main body is overlapped and joined to the filter cloth attachment base, the stitching force between the filter cloth attachment mouth and the filter cloth main body is increased. Can do. For this reason, since it has the same strength as a filter in which the filter cloth body and the filter cloth attachment port base part are integrally manufactured, it is possible to prevent the filter cloth body from being broken and the scrim from coming off.

  Moreover, according to this invention, the filter for dust collection which has sufficient stitching | suture force (joining force) can be manufactured, without adding a big change in a manufacturing process.

It is an enlarged view of the principal part cross section of the filter for dust collection concerning one embodiment of this invention. It is an enlarged view of the principal part cross section of the filter for dust collection concerning other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Filter cloth attachment port base part 2, 11, 32 Upper end part 3 Lower end 4 Annular recessed part 5 Portion main body 6 Packing 7 Snap ring 8 Thread 10, 31 Filter cloth main body 12, 33 Folding part A, B Dust collection filter

Claims (2)

A dust collection filter comprising a filter cloth attachment port base and a filter cloth main body used in a pulse jet type dust collector, wherein a folded portion formed by folding back the upper end of the filter cloth main body is the filter cloth attachment mouth base A dust collecting filter, which is joined to a lower end portion. The dust collecting filter according to claim 1, wherein the joining is joining by sewing.