Mounting structure and method for mounting the filter cloth.

Abstract

To provide a mounting structure for the filter cloth attachment section that eliminates concerns about filter cloth tube falling accidents, is inexpensive to manufacture, and offers excellent sealing performance. [Solution] In a bag filter system comprising a partition plate 1 separating a coarse gas chamber and a pure gas chamber, a filter cloth mounting hole 1a opened in the partition plate, and a filter cloth tube 3 having a tubular filter cloth with one end open and attached to each filter cloth mounting hole, the mounting structure for the filter cloth mounting portion that tightly fixes the open end of the filter cloth tube to the filter cloth mounting hole comprises a short tubular ring-shaped burring portion 1b formed so as to protrude toward one chamber side of the partition plate at the edge of the filter cloth mounting hole of the partition plate, a filter cloth mounting collar 2 formed in a short tubular shape and pressed into the tube of the burring portion so that at least a portion of the outer peripheral wall is in close contact with the inner wall of the burring portion over its entire circumference, and a stopper portion 2b at the end of the filter cloth mounting collar in the direction of protrusion of the burring portion, wherein the diameter of the filter cloth mounting collar is reduced or increased.

Description

Technical Field

[0001] The present invention relates to an attachment structure of a filter cloth mounting part for connecting a filter cloth tube to a partition plate that partitions between a raw gas chamber and a pure gas chamber in a bag filter facility, a manufacturing method thereof, and a filter cloth attachment method.

Background Art

[0002] In power plants, steel mills, cement factories, garbage incinerators, etc., bag filter facilities for separating and removing dust by filtration and dust collection are widely used from suspension gases (dust-containing gases) mixed with dust such as soot generated by combustion (see Non-Patent Document 1). Bag filter facilities are roughly classified into mechanical vibration type, reverse pressure type, and pulse jet type according to the method of removing deposited dust. A schematic diagram of a pulse jet type bag filter is shown in FIG. 11, and a schematic diagram of a reverse pressure type bag filter is shown in FIG. 12. Each of these types of bag filter facilities generally includes a partition plate (separation plate, cell plate) that partitions between a raw gas chamber into which the dust-containing gas flows and a pure gas chamber from which the clean gas obtained by separating and removing dust from the dust-containing gas by filtration and dust collection flows out, a plurality of filter cloth attachment holes formed in the partition plate, and a filter cloth tube having a filter cloth inserted into each filter cloth attachment hole and having a thimble shape (a tubular shape with one end being a blind end and the other end being an open end). Inside the tube of the filter cloth tube, a cage (retainer) made of a cage-shaped lattice is inserted to hold the filter cloth in an expanded shape. The dust that falls from the filter cloth tube when the deposited dust is removed is discharged to the outside by a screw conveyor provided at the lower part of the raw gas chamber. Therefore, usually, the pure gas chamber is disposed above the partition plate, and the raw gas chamber is disposed below the partition plate. The filter cloth tube is dust-proof connected to the filter cloth attachment hole formed in the partition plate on the open end side. The pulse jet type bag filter in FIG. 11 is of a type in which the filter cloth tube is suspended from the partition plate into the raw gas chamber below it. In this type, dust collection is performed on the outer surface side of the filter cloth tube. Also, in the reverse pressure type bag filter in FIG. 12, the filter cloth tube is lifted from the partition plate into the pure gas chamber above it. In this type, dust collection is performed on the inner surface side of the filter cloth tube.

[0003] In such bag filter equipment, the mounting structure for the filter cloth attachment part, which connects the open end of the filter cloth tube to a filter cloth attachment hole formed in a partition plate, is known from Patent Documents 1 to 10. Figure 13 shows the mounting structure for the filter cloth attachment part described in Patent Document 1. Similar mounting structures for filter cloth attachment parts are also described in Patent Documents 2 to 5. This mounting structure using a snap ring is widely used. As shown in Figure 13, a snap ring made of a ring-shaped leaf spring is sewn into the open end of the filter cloth tube, and a core cord made of a ring-shaped string is sewn near both sides of the snap ring. This core cord causes the outer surface of the open end of the filter cloth tube to bulge outward, and a recess is formed on the outer surface of the filter cloth tube between these two bulging parts. In addition, the open end of the filter cloth tube is constantly subjected to an outward expanding force due to the elasticity of the snap ring. When attaching the filter cloth tube to the partition plate, the open end of the filter cloth tube is held down by hand to reduce its diameter and inserted through the filter cloth mounting hole, then released (see Figures 4 to 7 of Patent Document 3). As shown in Figures 13(a) and (b), the edge of the filter cloth mounting hole is fitted into the recess, and the filter cloth tube is fixed to the partition plate by sandwiching the top and bottom edges of the filter cloth mounting hole with the two bulging parts.

[0004] Furthermore, Patent Document 6 describes a method of attaching the open end of a filter cloth tube to a partition plate by fitting the two bulging parts on the outer surface of the open end of a filter cloth tube made of a core string, as shown in Figures 13(a) and (b), into the hole by fitting the bulging parts into this groove (see the leftmost figure in the same document).

[0005] Furthermore, Patent Documents 7 and 8 describe a method for attaching a filter cloth tube in which a cylindrical collar is fitted into the filter cloth mounting hole. In this method, the upper end of the cylindrical collar is fixed to the edge of the filter cloth mounting hole by welding (see Patent Document 7, Figures 1 and 4, paragraph

[0012] of the same document) or by fitting a groove on the outer circumference of the upper end of the collar with the edge of the filter cloth mounting hole (see Patent Document 7, Figure 2, paragraph

[0048] of the same document; Patent Document 8, Figure 1, etc.). On the other hand, an annular projection (see projection 51 in Figure 1 of Patent Document 7, Figure 1 of Patent Document 8, etc.) is formed on the inner circumferential wall of the lower end of the collar to prevent the filter cloth tube from falling out, and the upper end of the filter cloth tube inserted into the collar is supported by this annular projection and held inside the tube of the collar.

[0006] Furthermore, Patent Documents 9 and 10 describe a method for attaching a filter cloth tube in which the edge of the filter cloth attachment hole is shaped to bend (constrict) in the direction in which the filter cloth tube is inserted. In this method, the inner circumferential wall of the tip of the burring section, which is shaped to bend, has an annular projection (see fitting section 5 in Figure 1 of Patent Document 9; see pressure contact holding section 3b in Figure 2 of Patent Document 10) formed thereon to prevent the filter cloth tube from falling out. The upper end of the filter cloth tube inserted into the burring section is supported by this annular projection and held within the tube of the burring section. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Utility Model Publication No. 07-000510 [Patent Document 2] Japanese Patent Publication No. 2006-231315 [Patent Document 3] Japanese Utility Model Publication No. 07-013414 [Patent Document 4] Japanese Patent Publication No. 2022-113954 [Patent Document 5] Japanese Patent Publication No. 2009-178700 [Patent Document 6] Japanese Patent Publication No. 2007-083150 [Patent Document 7] Japanese Utility Model Publication No. 06-072621 [Patent Document 8] Japanese Utility Model Publication No. 06-064708 [Patent Document 9] Japanese Patent Application Publication No. 04-004009 [Patent Document 10] Japanese Patent Publication No. 2011-098266 [Non-patent literature]

[0008] [Non-Patent Document 1] The Society of Chemical Engineers, Japan (ed.), "Revised Sixth Edition: Handbook of Chemical Engineering," Maruzen Co., Ltd., February 25, 1999, ISBN: 4-621-04535-0, pp. 824-825. [Non-Patent Document 2] Kuniaki Odori, author, "Understanding Press Working Most Clearly (Illustrated Mechanism Series 69)", Gijutsu Hyoronsha, May 1, 2021, ISBN: 978-4297120122, pp. 120-121, 136-137. [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] The most widely used mounting structure for the filter cloth attachment, as described in Patent Documents 1 to 5, involves sandwiching the edge of the filter cloth attachment hole with a bulge formed by two core strings at the open end of the filter cloth tube. However, in this method, the tip of the open end of the filter cloth tube protrudes from the filter cloth attachment hole to the top of the partition plate (see Figures 13(a), (b), Figure 7 of Patent Document 3, etc.). In actual bag filter equipment, during maintenance, workers walk on the top surface of the partition plate to perform tasks such as replacing the filter cloth tube. However, if the tip of the open end of the filter cloth tube protrudes to the top of the partition plate, workers may accidentally kick the tip of the open end of the filter cloth tube, which can create a gap between the outer surface of the tip of the open end of the filter cloth tube and the edge of the filter cloth attachment hole, resulting in a decrease in the dust collection performance of the bag filter equipment. Furthermore, when replacing the filter cloth tube, the worker compresses the open end of the filter cloth tube by hand before attaching or detaching the open end to the edge of the filter cloth mounting hole. However, at this time, the worker sometimes accidentally drops the filter cloth tube through the filter cloth mounting hole below the partition plate (hereinafter referred to as "filter cloth tube drop accident"). In this case, retrieving the filter cloth tube that has fallen from below the partition plate is extremely difficult, which reduces the efficiency of maintenance work.

[0010] The problem of filter cloth tubes falling during this operation can also occur in the case of the filter cloth mounting structure described in Patent Document 6. In the case of the filter cloth mounting structure described in Patent Document 6, two fitting grooves are provided within the filter cloth mounting hole at a distance from each other, which requires the partition plate to be several centimeters thick, resulting in high costs and making the manufacturing process very difficult.

[0011] On the other hand, in the methods of attaching collars to the filter cloth mounting holes described in Patent Documents 7 and 8, and in the methods of forming burrings to the filter cloth mounting holes described in Patent Documents 9 and 10, the tip of the open end of the filter cloth tube does not protrude above the partition plate when the filter cloth tube is attached, and the annular protrusions on the inner circumferential wall of the collar or burring do not cause the problem of the filter cloth tube falling during work.

[0012] However, forming an annular groove on the upper end of the outer wall of the collar and fitting the edge of the filter cloth mounting hole into this groove, as shown in Figure 2 of Patent Document 7 and Figure 1 of Patent Document 8, is not practically feasible. This is because, in bag filter equipment, the interior becomes hot during operation, so both the partition plate and the collar are usually made of metal. To fit a metal ring into a metal annular groove, the collar needs to be deformed, but a metal annular groove cannot be deformed by bending it radially. It is also possible to weld the upper end of the collar to the edge of the filter cloth mounting hole, as shown in Figure 1 of Patent Document 7. However, in typical bag filter equipment, the partition plate has a very large number of filter cloth mounting holes, and welding the collar to all of them would require a great deal of labor during manufacturing, resulting in high manufacturing costs.

[0013] Furthermore, as shown in Figure 1 of Patent Document 9, forming a burring in the filter cloth mounting hole of a metal partition plate and processing it so that the tip of the burring is reduced in diameter is also difficult to process. In addition, as shown in Figure 2 of Patent Document 9, forming a burring in the filter cloth mounting hole of a metal partition plate and forming an annular projection (3b) on the inner circumference of the burring cannot be manufactured by normal press working, and the annular projection (3b) must be welded separately, which requires a great deal of labor in manufacturing and results in high manufacturing costs.

[0014] Therefore, the object of the present invention is to provide a mounting structure for a filter cloth mounting section, a method for manufacturing the same, and a method for mounting a filter cloth that eliminates concerns about accidents involving the drop of the filter cloth tube, is inexpensive to manufacture and suitable for mass production, and also has excellent dustproof sealing properties. [Means for solving the problem]

[0015] The first configuration of the mounting structure of the filter cloth mounting part according to the present invention is a partition plate that partitions between a raw gas chamber into which dust-containing gas flows and a pure gas chamber from which the clean gas obtained by separating and removing dust from the dust-containing gas flows out, a plurality of filter cloth mounting holes opened in the partition plate, and a filter cloth tube having a tubular filter cloth mounted in each of the filter cloth mounting holes, with one end being a blind end and the other end being an open end. In a bag filter facility, it is a mounting structure of the filter cloth mounting part for closely fixing the open end of the filter cloth tube to the filter cloth mounting hole, a short tube ring-shaped burring part formed by shaping the hole edge of the filter cloth mounting hole of the partition plate so as to project toward one chamber side of the partition plate, a filter cloth mounting collar press-fitted into the tube of the burring part so as to be formed in a short tube shape and at least a partial section of the outer peripheral wall to be in close contact with the inner wall of the burring part over the entire circumference, a stopper part formed by reducing the inner diameter of the tube of the filter cloth mounting collar or expanding the outer diameter of the tube of the filter cloth mounting collar on the end side of the filter cloth mounting collar in the protruding direction of the burring part, and is characterized by including these components.

[0016] According to this configuration, since the filter cloth mounting collar is formed into a crimping structure to the burring part, the attachment of the filter cloth to the filter cloth mounting holes of the filter cloth mounting collar is not a welding structure. Therefore, during the operation of the bag filter equipment, distortion or breakage of the connection part due to heat, vibration, etc. does not occur, and high dust-proof sealing performance is maintained. Further, the forming of the burring part on the filter cloth mounting holes of the partition plate can be easily performed in one or two steps by a squeezing forming (burring process; refer to Non-Patent Document 2) using a burring punch. Also, the attachment of the filter cloth mounting collar to the burring part of the filter cloth mounting holes of the partition plate is completed in one step by pressing. Thus, the manufacturing cost is low and it is suitable for mass production. Further, by press-fitting the filter cloth mounting collar into the pipe of the burring part, by utilizing the repulsive characteristics of the materials constituting the burring part and the filter cloth mounting collar, the burring part and the filter cloth mounting collar can be firmly integrated without the intervention of a gasket or the like, and the dust-proof sealing performance of the connection part between the two can be enhanced. Also, by adopting a double structure in which the filter cloth mounting collar is press-fitted into the burring part, the filter cloth mounting collar also functions as a buffer material between the partition plate and the coating tube. Therefore, the dust-proof sealing performance between the filter cloth mounting collar and the partition plate can be further improved compared to the conventional case.

[0017] The second configuration of the attachment structure of the filter cloth mounting part according to the present invention is, in the first configuration, On the outer surface of the filter cloth mounting collar, at least two diameter-expanded protrusion parts that expand the outer peripheral wall of the filter cloth mounting collar are formed. The filter cloth mounting collar is characterized in that each of the diameter-expanded protrusion parts is press-fitted into the pipe of the burring part so as to be in close contact with the inner wall of the burring part.

[0018] In this configuration, two or more enlarged diameter protrusions are pressed against the inner wall of the burring portion at the edge of the filter cloth mounting hole in the partition plate, thereby creating a dustproof seal between the burring portion and the filter cloth mounting collar. Furthermore, even if a minute gap occurs between the enlarged diameter protrusion and the inner wall of the burring portion due to manufacturing tolerances or vibrations during operation, a sealed space is formed between the filter cloth mounting collar and the burring portion by two adjacent enlarged diameter protrusions. This sealed space is then sealed by dust during operation of the bag filter equipment, preventing a decrease in dustproof sealing performance.

[0019] A third configuration of the mounting structure for the filter cloth mounting portion according to the present invention is, in the first configuration, The filter cloth mounting collar has a ring-shaped flange portion formed at the end opposite to the side where the stopper portion is formed. The filter cloth mounting collar is characterized in that the flange portion is in close contact with the side of the partition plate opposite to the side on which the burring portion protrudes.

[0020] This configuration allows for a tighter seal between the partition plate and the flange portion of the filter cloth mounting collar, thereby improving the dustproof sealing performance between the partition plate and the filter cloth mounting collar.

[0021] A fourth configuration of the mounting structure for the filter cloth mounting portion according to the present invention is, in the first configuration described above, The stopper portion is formed by reducing the inner diameter of the filter cloth mounting collar. The aforementioned filter cloth tube has a snap ring made of an annular leaf spring sewn into its open end. The filter cloth tube is inserted into the tube of the filter cloth mounting collar such that its blind end is on the side where the burring portion of the partition plate protrudes, and the open end of the filter cloth tube does not protrude out of the tube of the filter cloth mounting collar. Due to the elasticity of the snap ring, the outer surface of the open end of the filter cloth tube is pressed against the inner wall of the pipe in the portion of the filter cloth mounting collar where the inner diameter of the pipe is larger than that of the stopper portion.

[0022] With this configuration, the open ends into which the filter cloth mounting collar and the snap ring of the filter cloth tube are sewn do not protrude from the surface of the partition plate. Therefore, even when the filter cloth tube is installed, there are no protrusions on the partition plate, improving workability during maintenance such as attaching and detaching the filter cloth tube, and eliminating accidents such as stepping on the filter cloth tube.

[0023] A fifth configuration of the mounting structure for the filter cloth mounting portion according to the present invention is, in the first configuration, The stopper portion is formed by enlarging the outer diameter of the filter cloth mounting collar. The filter cloth mounting collar is formed such that the stopper portion protrudes beyond the tip of the burring portion, and a seating portion, which is a straight tubular section, is formed between the stopper portion and the tip of the burring portion. The filter cloth tube is fitted so that its open end covers the section of the filter cloth mounting collar from the stopper portion to the seated portion, with the blind end being the side on which the burring portion of the partition plate protrudes. The filter cloth tube is characterized by having a tightening band that constricts the section to which the seated portion at the open end is fitted from the outside.

[0024] With this configuration, the mounting structure for the filter cloth attachment part of the present invention can also be applied to filter cloth tubes that are secured to a partition plate by being compressed using a compression band (band-type filter cloth tubes).

[0025] The present invention relates to a method for manufacturing a filter cloth mounting section, comprising: a partition plate separating a coarse gas chamber into which dust-containing gas flows and a pure gas chamber into which clean gas obtained by separating and removing dust from the dust-containing gas flows out; a plurality of filter cloth mounting holes opened in the partition plate; and filter cloth tubes fitted into each of the filter cloth mounting holes, each having a tubular filter cloth with one end being a blind end and the other end being an open end, wherein the method for manufacturing a filter cloth mounting section comprises a method for tightly fixing the open end of the filter cloth tube to the filter cloth mounting hole, A short, ring-shaped burring portion is formed on the edge of each filter cloth mounting hole of the partition plate, so as to protrude toward one chamber side of the partition plate. A filter cloth mounting collar is formed in a short tubular shape, with a stopper portion formed at one end where the inner diameter of the pipe narrows or the outer diameter expands. The method is characterized by pressing the outer wall of the burring portion into the pipe such that at least a portion of it is in close contact with the inner wall of the burring portion.

[0026] The present invention relates to a filter cloth mounting method for a bag filter system comprising: a partition plate separating a coarse gas chamber into which dust-containing gas flows and a pure gas chamber into which clean gas, from which dust has been separated and removed from the dust-containing gas, flows out; a plurality of filter cloth mounting holes opened in the partition plate; and a filter cloth tube, which is fitted into each of the filter cloth mounting holes, and is tubular in shape with one end being a blind end and the other end being an open end, and having a snap ring made of an annular leaf spring sewn to the open end, wherein the open end of the filter cloth tube is tightly fixed to the filter cloth mounting hole, A short, ring-shaped burring portion is formed on the edge of each filter cloth mounting hole of the partition plate, so as to protrude toward one chamber side of the partition plate. A filter cloth mounting collar is formed in a short tubular shape, with a stopper portion formed at one end that reduces the inner diameter of the pipe, At least a portion of the outer wall is pressed into the pipe of the burring section so as to be in close contact with the inner wall of the burring section, Insert the filter cloth tube into the pipe of the filter cloth mounting collar such that the blind end is on the side where the burring portion of the partition plate protrudes, and insert the filter cloth tube through the pipe of the filter cloth mounting collar to a position where its open end does not protrude out of the pipe of the filter cloth mounting collar. The elasticity of the snap ring causes the outer surface of the open end of the filter cloth tube to be pressed against the inner wall of the filter cloth mounting collar in the portion of the tube where the inner diameter is larger than that of the stopper portion. [Effects of the Invention]

[0027] As described above, the present invention provides a mounting structure for a filter cloth mounting section and a manufacturing method thereof that can be manufactured at a low cost and is suitable for mass production, by making the mounting structure of the filter cloth mounting section such that the filter cloth mounting collar is in close contact with the burring section. Furthermore, by press-fitting the filter cloth mounting collar into the burring section, the rebound properties of the materials constituting the burring section and the filter cloth mounting collar can be utilized to firmly integrate the burring section and the filter cloth mounting collar without the need for padding such as gaskets, thereby improving the dustproof sealing performance of the connection between the two. In addition, by creating a double structure in which the filter cloth mounting collar is press-fitted into the burring section, the filter cloth mounting collar also functions as a buffer between the partition plate and the coating tube, thereby improving the dustproof sealing performance of the filter cloth mounting collar and the partition plate compared to conventional designs. Furthermore, by inserting the filter cloth tube into the tube of the filter cloth mounting collar so that the open end of the filter cloth tube does not protrude out of the tube of the filter cloth mounting collar, accidents such as the filter cloth tube falling during maintenance can be prevented. [Brief explanation of the drawing]

[0028] [Figure 1] This is an exploded perspective view of the mounting structure for the filter cloth attachment part according to Embodiment 1 of the present invention. [Figure 2] Figure 1 is a cross-sectional view of the mounting structure of the filter cloth attachment section. [Figure 3] This is an enlarged cross-sectional view of the area within the dotted line frame A in Figure 2. [Figure 4] This is an enlarged cross-sectional view of the area within the dotted line frame B in Figure 2. [Figure 5] This is an enlarged cross-sectional view of the opening end of the mounting structure for the filter cloth attachment part when using a filter cloth tube 3 without a core string. [Figure 6] This diagram shows the state in which the retainer 4 is inserted into the filter cloth tube 3. [Figure 7] This is a cross-sectional view of the mounting structure of the filter cloth mounting portion according to Embodiment 2 of the present invention. [Figure 8] This is a cross-sectional view of the mounting structure of the filter cloth mounting portion according to Embodiment 3 of the present invention. [Figure 9] This is a cross-sectional view of the mounting structure for the filter cloth mounting portion according to Embodiment 4 of the present invention. [Figure 10] This is a cross-sectional view of the mounting structure of the filter cloth mounting portion according to Embodiment 5 of the present invention. [Figure 11] This is a schematic diagram of a pulse jet bag filter. [Figure 12] This is a schematic diagram of a reverse pressure bag filter. [Figure 13] This is a conventional mounting structure for a filter cloth attachment part, as described in Patent Document 1. [Modes for carrying out the invention]

[0029] Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. [Examples]

[0030] Figure 1 is an exploded perspective view of the mounting structure of the filter cloth mounting section according to Embodiment 1 of the present invention. Figure 1 shows the state before the filter cloth tube is fitted. Also in Figure 1, of the filter cloth mounting holes 1a opening in the partition plate 1, the rows other than the central row (front row and rear row) show the state before the filter cloth mounting collar 2 is pressed in. Figure 2 is a cross-sectional view of the mounting structure of the filter cloth mounting section of Figure 1, where Figure 2(a) shows the state before the filter cloth mounting collar 2 is fitted into the burring section 1b, Figure 2(b) shows the state with the filter cloth mounting collar 2 fitted into the burring section 1b, and Figure 2(c) shows the state with the filter cloth mounting collar 2 fitted into the burring section 1b and the filter cloth tube 3 attached. Figure 3 is an enlarged cross-sectional view of the portion of the dotted line frame A in Figure 2. Figure 3 shows the state before the filter cloth tube is fitted. Figure 4 is an enlarged cross-sectional view of the portion of the dotted line frame B in Figure 2. Figure 4 shows the filter cloth tube in place.

[0031] The mounting structure for the filter cloth attachment section of this embodiment is a mounting structure for tightly fixing the open end of the filter cloth tube to the filter cloth attachment hole 1a in a bag filter system that includes a partition plate 1 (see also Figures 11 and 12) that separates a coarse gas chamber into which dust-containing gas flows and a pure gas chamber into which clean gas, from which dust has been separated and removed from the dust-containing gas, flows out; a plurality of filter cloth attachment holes 1a opened in the partition plate 1; and a filter cloth tube 3 (see Figure 2) that is attached to each filter cloth attachment hole 1a and has a tubular filter cloth with one end being a blind end and the other end being an open end. This mounting structure can be applied to bag filter systems that use either a method in which the filter cloth tube is suspended downward from the partition plate as shown in Figure 11, or a method in which the filter cloth tube is suspended above the partition plate as shown in Figure 12.

[0032] In the mounting structure of this embodiment, (1) The edge of the filter cloth mounting hole 1a of the metal partition plate 1 is formed by drawing out a short tube ring-shaped burring portion 1b so as to protrude toward one chamber side of the partition plate 1 (the lower chamber side of the partition plate 1 in Figures 1 to 4), (2) The device comprises a metal filter cloth attachment collar 2 formed in a short tubular shape, which is pressed into the tube of the burring portion 1b such that at least a portion of the outer circumferential wall 2a (in this embodiment, the sections L1 and L2 at the tips of the two enlarged diameter projections 2d (see Figure 3)) are in close contact with the inner wall of the burring portion 1b over its entire circumference.

[0033] At the end of the filter cloth mounting collar 2 in the direction of protrusion of the burring section 1b (downward in Figures 1 to 4), a stopper section 2b is formed, which reduces the inner diameter of the filter cloth mounting collar 2. The stopper section 2b is intended to catch the open end portion of the filter cloth tube 3, preventing the filter cloth tube 3 from falling (in the case of a method where the filter cloth tube is suspended downward from the partition plate (see Figure 11)) or slipping upward (in the case of a method where the filter cloth tube is suspended above the partition plate (see Figure 12)).

[0034] Furthermore, a ring-shaped flange portion 2c is formed on the end of the filter cloth mounting collar 2 opposite to the stopper portion 2b, so as to widen outward toward the pipe. In addition, two enlarged projections 2d are formed on the outer surface of the filter cloth mounting collar 2 between the stopper portion 2b and the flange portion 2c, by enlarging the outer circumferential wall of the filter cloth mounting collar 2.

[0035] When the filter cloth mounting collar 2 is press-fitted into the pipe of the burring section 1b (see Figures 2 and 3), the enlarged diameter projections 2d, 2d each press against the inner wall of the burring section 1b. Here, "press-fitting" means inserting under pressure. "Press-fitting" means a state in which two objects in contact with each other are tightly pressed together by internal stress. In Figure 3, the sections L1 and L2 at the tips of the enlarged diameter projections 2d, 2d on the outer wall of the filter cloth mounting collar 2 are pressed against the inner wall of the burring section 1b. Also, the side of the partition plate 1 opposite to the side from which the burring section 1b protrudes (the top surface in Figures 1 to 4) and the flange section 2c are in close contact (see Figures 3 and 4). Furthermore, in order to improve dustproof sealing when the filter cloth mounting collar 2 is pressed in, the outer diameter of the enlarged projection 2d is adjusted to be slightly larger than the inner diameter of the burring section 1b (referring to the inner diameter of the straight pipe portion of the burring section 1b (excluding the trumpet-shaped enlarged base portion)) before the filter cloth mounting collar 2 is pressed in. This is to ensure that the enlarged projections 2d, 2d are pressed against the inner wall of the burring section 1b when the filter cloth mounting collar 2 is pressed into the burring section 1b.

[0036] The enlarged diameter protrusions 2d, 2d on the outer circumferential wall of the filter cloth mounting collar 2 are formed by press molding the tubular body of the filter cloth mounting collar 2, and annular internal grooves 2e, 2e are formed on the inner circumferential wall side of these enlarged diameter protrusions 2d, 2d (see Figure 3).

[0037] When manufacturing the mounting structure shown in Figures 1, 2(b), and 3, the filter cloth mounting collar 2 is pressed into the pipe of the burring section 1b under high pressure using a press or the like. Therefore, the filter cloth mounting collar 2 is designed not to easily come out of the burring section 1b.

[0038] Next, regarding the filter cloth tube 3 that is attached to the filter cloth mounting collar 2, in this embodiment, a filter cloth tube with a snap ring sewn into its open end is used, similar to the one described using Figure 13 in the [Background Art] section. In Figures 2(c) and 4, the filter cloth tube 3 is composed entirely of a filter cloth 3a that captures dust, and the filter cloth 3a on the open end side of the filter cloth tube 3 is folded in half as shown in Figure 4, with a snap ring 3b made of an annular leaf spring and two annular core cords 3c, 3c sewn between the folded filter cloth 3a. Note that in the examples of Figures 2(c) and 4, the filter cloth 3a is folded inward at the open end, but it can of course be folded outward as well. The snap ring 3b is the same as the one shown in Figure 13(d). The core cords 3c, 3c are sewn in two places, upper and lower, between the outer surface of the snap ring 3b and the filter cloth 3a outside of it (see Figure 4). The open end of the filter cloth tube 3 is constantly subjected to an elastic force that expands in diameter due to the elasticity of the snap ring 3b. In addition, annular projections 3d, 3d are formed on the outer surface of the filter cloth 3a at the open end of the filter cloth tube 3 by being partially spread open by the two core strings 3c, 3c.

[0039] When attaching the filter cloth tube 3 to the partition plate 1, the filter cloth tube 3 is inserted into the tube of the filter cloth mounting collar 2 from the flange portion 2c side of the filter cloth mounting collar 2, starting from the blind end side, until the portion of the open end of the filter cloth tube 3 in which the snap ring 3b is sewn (hereinafter referred to as the "open end") fits into the upper part of the stopper portion 2b inside the tube of the filter cloth mounting collar 2. When fitting the open end into the filter cloth mounting collar 2, the worker inserts the open end into the tube of the filter cloth mounting collar 2 while pressing the snap ring 3b inward with their hand (see, for example, Figures 4 and 5 of Patent Document 3), and then, when released, the elasticity of the snap ring 3b causes the entire circumference of the outer surface of the filter cloth 3a at the open end to adhere tightly to the inner surface of the filter cloth mounting collar 2.

[0040] Furthermore, since the tip of the filter cloth mounting collar 2 has a stopper portion 2b, when an operator inserts the open end of the filter cloth tube 3 into the pipe of the filter cloth mounting collar 2, the open end cannot pass through the pipe of the reduced-diameter stopper portion 2b. This prevents accidents such as the open end of the filter cloth tube 3 slipping through the pipe of the filter cloth mounting collar 2 and falling below the partition plate 1 (in the case of the method in which the filter cloth tube is suspended below the partition plate (see Figure 11)) or slipping above the partition plate 1 (in the case of the method in which the filter cloth tube is suspended above the partition plate (see Figure 12)).

[0041] Furthermore, if necessary, after attaching the filter cloth tube 3 to the filter cloth mounting collar 2, a mesh cage-shaped retainer 4 is inserted into the tube of the filter cloth tube 3 to maintain the shape of the filter cloth 3a, as shown in Figure 6. Note that the retainer 4 is not directly related to the present invention, so a detailed explanation is omitted.

[0042] The state in which the open end of the filter cloth tube 3 is fitted inside the pipe of the filter cloth mounting collar 2 is shown in Figures 2(c) and 4. In this way, the outer surface of the filter cloth 3a at the open end of the filter cloth tube 3 and the inner circumferential wall of the filter cloth mounting collar 2 are in close contact, blocking the passage of dust and creating a dustproof seal between the open end of the filter cloth tube 3 and the filter cloth mounting collar 2. In addition, the enlarged diameter protrusions 2d, 2d are pressed against the inner wall of the burring portion 1b at the edge of the filter cloth mounting hole 1a of the partition plate 1, thus creating a dustproof seal between the burring portion 1b and the filter cloth mounting collar 2. Furthermore, even if a minute gap occurs between the enlarged diameter protrusions 2d, 2d and the inner wall of the burring portion 1b due to manufacturing tolerances or vibrations during operation, a sealed space is formed between the filter cloth mounting collar 2 and the burring portion 1b by the two enlarged diameter protrusions 2d, 2d. Therefore, when the bag filter equipment is in operation, this sealed space is sealed by dust, preventing a decrease in dustproof sealing performance.

[0043] Furthermore, when the filter cloth tube is installed, the size is adjusted so that the tip 3e of the open end of the filter cloth tube 3 does not protrude outside the pipe of the filter cloth mounting collar 2. This prevents the worker from accidentally kicking the tip 3e of the open end of the filter cloth tube 3 when performing maintenance work such as replacing the filter cloth tube 3 while standing on the top surface of the partition plate 1, and prevents accidents such as a gap forming between the outer surface of the tip 3e of the open end of the filter cloth tube and the inner wall of the pipe of the filter cloth mounting collar 2, which would impair the dustproof sealing performance.

[0044] In particular, when using the retainer 4 as shown in Figure 6, the filter cloth mounting collar 2 and the open end of the filter cloth tube 3 do not protrude from the surface of the partition plate 1, improving the workability when attaching and detaching the retainer 4. Furthermore, accidents such as the filter cloth tube 3 falling to the bottom of the partition plate 1 due to the worker accidentally stepping on the open end of the filter cloth tube 3 during the attachment and detachment of the retainer 4 are eliminated.

[0045] Furthermore, in the embodiments shown in Figures 2(c) and 4, the positions of the core strings 3c, 3c and the internal grooves 2e, 2e are adjusted so that the annular projections 3d, 3d formed on the outer surface of the filter cloth 3a at the open end of the filter cloth tube 3 fit into the internal grooves 2e, 2e formed on the inner circumferential wall of the filter cloth mounting collar 2. By fitting the annular projections 3d, 3d into the internal grooves 2e, 2e in this way, the dustproof performance of the connection can be further improved.

[0046] Furthermore, a filter cloth tube 3 without core strings 3c, 3c can also be used. Figure 5 shows an enlarged cross-sectional view of the opening end of the mounting structure of the filter cloth attachment part when a filter cloth tube 3 without core strings is used. The enlarged cross-sectional view in Figure 5 corresponds to the dotted line frame B in Figure 2. In Figure 5, the same reference numerals are used for components corresponding to those in Figure 4. In this case, only the snap ring 3b is sewn into the opening end of the filter cloth tube 3. In this example, since there is no core string 3c, there is also no annular projection 3d on the outer surface of the opening end of the filter cloth tube 3.

[0047] Finally, the advantages of the double structure in the mounting structure of the present invention, in which a burring portion 1b is provided in the filter cloth mounting hole 1a of the partition plate 1 and a filter cloth mounting collar 2 is press-fitted into this burring portion 1b, will be explained.

[0048] First, with this structure, the attachment of the filter cloth mounting collar 2 to the partition plate 1 can be completed in a single step during the manufacturing of the mounting structure. This is because the filter cloth mounting collar 2 is simply pressed into the burring portion 1b using a press machine or the like. The burring process of the edges of the filter cloth mounting holes 1a in the partition plate 1 can also be easily performed in one or two steps by punch molding using a burring punch, and the filter cloth mounting collar 2 can also be easily mass-produced by press processing. Therefore, the manufacturing cost is low. On the other hand, for example, in a configuration in which a collar for attaching the filter cloth is welded to the edge of the filter cloth mounting hole, as shown in Figures 1 and 4 of Patent Document 7, it is necessary to weld a collar for attaching the filter cloth to each of the edges of numerous filter cloth mounting holes, which requires a great many steps in manufacturing. Therefore, the manufacturing cost is high.

[0049] Furthermore, as mentioned above, since the filter cloth mounting collar 2 can be attached to the partition plate 1 in a single step, replacing the partition plate 1 when the bag filter system itself becomes old becomes easy.

[0050] Furthermore, regarding the configuration in which an annular groove formed on the outer circumference of the upper end of a collar for attaching a filter cloth (see, for example, reference numeral 102 in Figure 2 of Patent Document 7) is fitted into the filter cloth attachment hole of a partition plate, as shown in Figure 2 of Patent Document 7 and Figure 1 of Patent Document 8, this is feasible if the collar is made of a flexible material such as resin. However, if the collar is made of metal, it is practically difficult to fit it in because it is impossible to bend the metal annular groove inward during fitting to fit it into the filter cloth attachment hole of a metal partition plate.

[0051] Furthermore, while welding methods described in Patent Document 7 and others can lead to problems such as welding defects during manufacturing, and deterioration or fracture of the welded joint due to thermal expansion, vibration, and other distortions during operation, such problems do not occur with the mounting structure of the present invention.

[0052] Furthermore, in the mounting structure of the present invention, by utilizing the repulsion properties of the material characteristics of metal, the filter cloth mounting collar 2 and the burring portion 1b of the partition plate 1 are integrated without the need for padding such as gaskets, thus maintaining a consistently high dustproof seal between the filter cloth mounting collar 2 and the partition plate 1. In addition, it is simpler and does not loosen compared to conventional crimp seals.

[0053] Furthermore, in the mounting structure of the present invention, a double structure is provided in which the filter cloth mounting collar 2 is press-fitted into the burring portion 1b, which has the advantage that vibrations are less likely to be transmitted between the partition plate 1 and the open end of the filter cloth tube 3 during the operation of the bag filter equipment. In this regard, as in Figure 1 of Patent Document 9 and Patent Document 10, if the open end of the filter cloth tube is directly attached to the burring formed on the edge of the filter cloth mounting hole of the partition plate (for example, see reference numeral 5 in Figure 1 of Patent Document 9), vibrations and deflection that occur in the partition plate during operation are directly transmitted to the open end of the filter cloth tube, so it is thought that the dustproof sealing performance between the open end of the filter cloth tube and the burring will decrease. On the other hand, in the mounting structure of the present invention, since the filter cloth mounting collar 2 also functions as a cushioning material, vibrations and deflection that occur in the partition plate 1 during operation are not directly transmitted to the connection part of the open end of the filter cloth tube 3, so that high dustproof sealing performance is maintained.

[0054] Furthermore, considering actual manufacturing, as shown in Figure 1 of Patent Document 9, processing to reduce the diameter of the tip of the burring (see reference numeral 5 in Figure 1 of Patent Document 9) is difficult to do with ordinary burring punch processing and requires special processing technology. In contrast, in the mounting structure of the present invention, the burring portion 1b is a normal straight, short tubular burring and can be manufactured by burring processing using a general burring punch (see, for example, Non-Patent Document 2). [Examples]

[0055] In Example 2, the mounting structure of the filter cloth attachment part of the present invention is applied to a bag filter system in which the filter cloth tube is suspended above the partition plate as shown in Figure 12, and an example is described in which a filter cloth tube 3 is fixed to the partition plate 1 using a band without a snap ring (band-type filter cloth tube).

[0056] Figure 7 is a cross-sectional view of the mounting structure of the filter cloth mounting section in Embodiment 2 of the present invention. In Figure 7, components corresponding to those in Figure 5 are denoted by the same reference numerals. In Embodiment 2, the partition plate 1 separates the pure gas chamber and the coarse gas chamber, as shown in Figure 12, and the filter cloth tube 3 is suspended and installed above the partition plate 1 with the open end facing downwards and the blind end facing upwards, as shown in Figure 12. In this case, the burring portion 1b formed at the edge of the filter cloth mounting hole 1a of the partition plate 1 is shaped to protrude in the form of a short tube ring toward the upper pure gas chamber.

[0057] The filter cloth mounting collar 2 is press-fitted into the pipe of the burring section 1b from below the filter cloth mounting hole 1a, with the flange section 2c facing downwards. In this embodiment, the filter cloth mounting collar 2 has two enlarged diameter protrusions 2d, 2d formed in an annular shape on its outer circumferential wall, close to the flange section 2c. At the pipe end opposite the flange section 2c, a stopper section 2b' is formed, which enlarges the outer diameter of the filter cloth mounting collar and protrudes in an annular shape without corners. A seating section 2f, which is a straight tubular section, is formed between the upper enlarged diameter protrusion 2d and the stopper section 2b'.

[0058] Furthermore, the maximum diameter of the stopper portion 2b' is configured to be less than or equal to the maximum diameter of the enlarged projection portion 2d (preferably less than or equal to the inner diameter of the burring portion 1b). This is because if the maximum diameter of the stopper portion 2b' is larger than the maximum diameter of the enlarged projection portion 2d, the stopper portion 2b' will not be able to pass through the tube of the burring portion 1b when the filter cloth mounting collar 2 is pressed into the tube of the burring portion 1b.

[0059] Meanwhile, the filter cloth tube 3 is fitted with its open end to the stopper portion 2b' of the filter cloth mounting collar 2, covering the section from the stopper portion 2b' to the seated portion 2f. The section (tightening section 3f) where the seated portion 2f at the tip of the open end of the filter cloth tube 3 is fitted is tightened and secured from the outside by the tightening band 5. The open end of the filter cloth tube 3, tightened by the tightening band 5, is locked in place by the annularly protruding stopper portion 2b' to prevent it from coming loose.

[0060] Thus, the mounting structure for the filter cloth attachment part of the present invention can also be applied to a band-type filter cloth tube 3 that is fixed to the partition plate 1 using a tightening band. [Examples]

[0061] Example 3 describes another configuration example regarding the structure in which at least a portion of the outer peripheral wall of the filter cloth mounting collar 2 and the inner wall of the burring portion 1b are brought into close contact with each other.

[0062] Figure 8 is a cross-sectional view of the mounting structure of the filter cloth mounting section in Embodiment 3. In this embodiment, the structure of the enlarged diameter projection 2d of the filter cloth mounting collar 2 is different from that of Embodiment 1. In this embodiment, there is only one enlarged diameter projection 2d. The outer peripheral wall of the filter cloth mounting collar 2 is pressed against the inner wall of the burring section 1b over its entire circumference in the section indicated by L1 in Figure 8. Also, similar to Embodiment 1, the flange section 2c is in close contact with the side of the partition plate 1 opposite to the side from which the burring section 1b protrudes. In this case, the dustproof sealing performance is lower compared to the structure of Embodiment 1, but it is possible to configure it in this form in the present invention. [Examples]

[0063] Example 4 describes another configuration example regarding the structure in which at least a portion of the outer peripheral wall of the filter cloth mounting collar 2 and the inner wall of the burring portion 1b are brought into close contact with each other.

[0064] Figure 9 is a cross-sectional view of the mounting structure of the filter cloth mounting section in Embodiment 4. In this embodiment, the structure of the enlarged diameter projection 2d of the filter cloth mounting collar 2 is different from that of Embodiment 1. In this embodiment, there is only one enlarged diameter projection 2d, and it is wider than in Embodiment 3. The outer peripheral wall of the filter cloth mounting collar 2 is pressed against the inner wall of the burring section 1b over its entire circumference in the section indicated by L1 in Figure 9. Also, similar to Embodiment 1, the flange section 2c is in close contact with the side of the partition plate 1 opposite to the side from which the burring section 1b protrudes. In this case as well, the dustproof sealing performance is lower compared to the structure of Embodiment 1, but it is possible to configure it in this form in the present invention. [Examples]

[0065] Example 5 describes another configuration example regarding the structure in which at least a portion of the outer peripheral wall of the filter cloth mounting collar 2 and the inner wall of the burring portion 1b are brought into close contact with each other.

[0066] Figure 10 is a cross-sectional view of the mounting structure of the filter cloth mounting section in Embodiment 5. In this embodiment, the position of the enlarged diameter projection 2d of the filter cloth mounting collar 2 is different from that of Embodiment 3. In this embodiment, there is only one enlarged diameter projection 2d, and its position is near the lower end of the burring section 1b. The outer peripheral wall of the filter cloth mounting collar 2 is pressed against the inner wall of the burring section 1b over its entire circumference in the section indicated by L1 in Figure 10. Also, similar to Embodiment 1, the flange section 2c is in close contact with the side of the partition plate 1 opposite to the side where the burring section 1b protrudes. In this case as well, the dustproof sealing performance is lower compared to the structure of Embodiment 1, but it is possible to configure it in this form in the present invention. [Explanation of symbols]

[0067] 1 partition plate 1a Filter cloth mounting hole 1b Burring section 2. Filter cloth mounting collar 2a Outer wall 2b, 2b' Stopper part 2c flange section 2d Diameter expansion protrusion 2e Internal grooves in the pipe 2f Seating area 3. Filter cloth tube 3a Filter cloth 3b Snap ring 3c core string 3d annular protrusion 3e Tip of the open end 3f Restricted section 4 retainers 5. Choking band

Claims

1. In a bag filter system comprising a partition plate separating a coarse gas chamber into which dust-containing gas flows and a pure gas chamber into which clean gas, from which dust has been separated and removed from the dust-containing gas, flows out; a plurality of filter cloth mounting holes opened in the partition plate; and filter cloth tubes having a tubular filter cloth with one end blind and the other end open, which are attached to each of the filter cloth mounting holes, the mounting structure of the filter cloth mounting part for tightly fixing the open end of the filter cloth tube to the filter cloth mounting hole, The edge of the filter cloth mounting hole in the partition plate is formed to have a short tube ring-shaped burring portion that protrudes toward one chamber side of the partition plate, A filter cloth mounting collar is formed in a short tubular shape, and at least a portion of its outer wall is pressed into the tubular part of the burring section so as to be in close contact with the inner wall of the burring section over its entire circumference, A stopper portion is formed on the end side of the filter cloth mounting collar in the protruding direction of the burring portion, by reducing the inner diameter of the filter cloth mounting collar or increasing the outer diameter of the filter cloth mounting collar. A mounting structure for a filter cloth attachment section, characterized by having the following features.

2. At least two enlarged projections are formed on the outer surface of the filter cloth mounting collar, which are formed by enlarging the outer circumferential wall of the filter cloth mounting collar. The filter cloth mounting collar is characterized in that each of the enlarged diameter projections is press-fitted into the tube of the burring portion so as to be in close contact with the inner wall of the burring portion. The mounting structure for the filter cloth mounting portion according to claim 1.

3. The filter cloth mounting collar has a ring-shaped flange portion formed at the end opposite to the side where the stopper portion is formed. The filter cloth mounting collar is characterized in that the flange portion is in close contact with the side of the partition plate opposite to the side on which the burring portion protrudes. The mounting structure for the filter cloth mounting portion according to claim 1.

4. The stopper portion is formed by reducing the inner diameter of the filter cloth mounting collar. The aforementioned filter cloth tube has a snap ring made of an annular leaf spring sewn into its open end. The filter cloth tube is inserted into the tube of the filter cloth mounting collar such that its blind end is on the side where the burring portion of the partition plate protrudes, and the open end of the filter cloth tube does not protrude out of the tube of the filter cloth mounting collar. Due to the elasticity of the snap ring, the outer surface of the open end of the filter cloth tube is pressed against the inner wall of the filter cloth mounting collar in the portion of the tube where the inner diameter is larger than that of the stopper portion. The mounting structure for the filter cloth mounting portion according to claim 1.

5. The stopper portion is formed by enlarging the outer diameter of the filter cloth mounting collar. The filter cloth mounting collar is formed such that the stopper portion protrudes beyond the tip of the burring portion, and a seating portion, which is a straight tubular section, is formed between the stopper portion and the tip of the burring portion. The filter cloth tube is fitted so that its open end covers the section of the filter cloth mounting collar from the stopper portion to the seated portion, with the blind end being the side on which the burring portion of the partition plate protrudes. The filter cloth tube is characterized by having a tightening band that tightens from the outside the section to which the seated portion at the open end is fitted. The mounting structure for the filter cloth mounting portion according to claim 1.

6. A bag filter system comprising: a partition plate separating a coarse gas chamber into which dust-containing gas flows and a pure gas chamber into which clean gas, from which dust has been separated and removed from the dust-containing gas, flows out; a plurality of filter cloth mounting holes opened in the partition plate; and filter cloth tubes fitted into each of the filter cloth mounting holes, each having a tubular filter cloth with one end blind and the other end open, wherein a method for manufacturing a filter cloth mounting part for tightly fixing the open end of the filter cloth tube to the filter cloth mounting hole, A short, ring-shaped burring portion is formed on the edge of each filter cloth mounting hole of the partition plate, so as to protrude toward one chamber side of the partition plate. A filter cloth mounting collar is formed in a short tubular shape, with a stopper portion formed at one end where the inner diameter of the pipe narrows or the outer diameter expands. The outer periphery wall is characterized by being pressed into the pipe of the burring portion such that at least a portion of it is in close contact with the inner wall of the burring portion. A method for manufacturing the filter cloth mounting section.

7. A bag filter system comprising: a partition plate separating a coarse gas chamber into which dust-containing gas flows and a pure gas chamber into which clean gas, from which dust has been separated and removed from the dust-containing gas, flows out; a plurality of filter cloth mounting holes opened in the partition plate; and a filter cloth tube, which is fitted into each of the filter cloth mounting holes and has a tubular shape with one end being a blind end and the other end being an open end, and a snap ring made of an annular leaf spring sewn to the open end, wherein the open end of the filter cloth tube is tightly fixed to the filter cloth mounting hole, A short, ring-shaped burring portion is formed on the edge of each filter cloth mounting hole of the partition plate, so as to protrude toward one chamber side of the partition plate. A filter cloth mounting collar is formed in a short tubular shape, with a stopper portion formed at one end that reduces the inner diameter of the pipe, At least a portion of the outer wall is pressed into the pipe of the burring section so as to be in close contact with the inner wall of the burring section, Insert the filter cloth tube into the pipe of the filter cloth mounting collar such that the blind end is on the side where the burring portion of the partition plate protrudes, and insert the filter cloth tube through the pipe of the filter cloth mounting collar to a position where its open end does not protrude out of the pipe of the filter cloth mounting collar. The elasticity of the snap ring causes the outer surface of the open end of the filter cloth tube to be pressed against the inner wall of the filter cloth mounting collar in the portion of the tube where the inner diameter is larger than that of the stopper portion. Filter cloth installation method.

Images