Attachment Structure of Filter Cloth Mounting Port and Filter Cloth Attachment Method

Abstract

Provided is an attachment structure for a filter cloth mounting portion that eliminates the concern of filter cloth tube dropping accidents, has a low manufacturing cost, and excellent sealing performance. 【Solution means】In a bag filter facility including a partition plate 1 that partitions between a raw 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 being an open end and mounted in each filter cloth mounting hole, an attachment structure for a filter cloth mounting portion that tightly fixes the open end of the filter cloth tube to the filter cloth mounting hole, comprising: a burring portion 1b in the shape of a short tube ring formed by shaping the hole edge of the filter cloth mounting hole of the partition plate to protrude toward one chamber side of the partition plate; a filter cloth mounting collar 2 formed in a short tubular shape and press-fitted into the tube of the burring portion such that at least a partial section of the outer peripheral wall is in close contact with the inner wall of the burring portion over the entire circumference; and a stopper portion 2b formed by reducing or expanding the tube diameter of the filter cloth mounting collar at the end of the filter cloth mounting collar in the protruding direction of the burring portion.

Description

Technical Field

[0001] The present invention relates to an attachment structure of a filter cloth mounting portion 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, waste incinerators, etc., bag filter facilities for separating and removing dust by filtration and dust collection are widely used from suspended 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. FIG. 11 shows a schematic diagram of a pulse jet type bag filter, and FIG. 12 shows a schematic diagram of a reverse pressure type bag filter. 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 dust-containing gas flows and a pure gas chamber from which 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 mounting holes formed in the partition plate, and a filter cloth tube having a filter cloth in a thimble shape (a tubular shape with one end being a blind end and the other end being an open end) inserted into each filter cloth mounting hole. A cage (retainer) made of a cage-shaped lattice is inserted into the tube of the filter cloth tube to hold the filter cloth in an expanded shape. Dust that falls from the filter cloth tube during the removal of deposited dust 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 open end side of the filter cloth tube is dust-proof connected to the filter cloth mounting hole formed in the partition plate. 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 a bug filter facility, as the mounting structure of the filter cloth mounting part that connects the open end of the filter cloth tube to the filter cloth mounting hole formed in the partition plate, those described in Patent Documents 1 to 10 are known. FIG. 13 shows the mounting structure of the filter cloth mounting part described in Patent Document 1. Also, Patent Documents 2 to 5 describe the mounting structure of the filter cloth mounting part in the same manner. This mounting structure using a snap ring is widely and commonly used. As shown in FIG. 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 string made of a ring-shaped string body is sewn near both sides of the snap ring. Due to this core string, the outer surface of the open end of the filter cloth tube bulges outward, and a concave portion is formed on the outer surface of the filter cloth tube between these two bulging portions. Also, due to the elasticity of the snap ring, a force that constantly expands outward is applied to the open end of the filter cloth tube. When attaching the filter cloth tube to the partition plate, hold the open end of the filter cloth tube by hand and reduce its diameter, insert it into the filter cloth mounting hole, and then release the hand (see FIGS. 4 to 7 of Patent Document 3). As shown in FIGS. 13(a) and (b), fit the hole edge of the filter cloth mounting hole into the concave portion, and sandwich the upper and lower parts of the hole edge of the filter cloth mounting hole by the two bulging portions to fix the filter cloth tube to the partition plate.

[0004] Also, Patent Document 6 describes a method of providing a fitting groove (groove 34 in FIG. 2 of Patent Document 8) on the inner wall of the hole of the filter cloth mounting hole of the partition plate for fitting the two bulging portions on the outer surface of the open end of the filter cloth tube by the core string as shown in FIGS. 13(a) and (b), and attaching the open end of the filter cloth tube into the hole of the filter cloth mounting hole by fitting the bulging portion into this groove (see the leftmost figure in FIG. 2 of the same document).

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

[0012] of the same document) or by fitting a groove on the outer periphery of the upper end of the collar with the edge of the filter cloth attachment hole (see FIG. 2 of Patent Document 7 and paragraph

[0048] of the same document; see FIG. 1 of Patent Document 8, etc.). On the other hand, an annular projection for preventing the filter cloth tube from falling (the projection 51 in FIG. 1 of Patent Document 7, see FIG. 1 of Patent Document 8, etc.) is formed on the inner peripheral wall of the lower end of the collar, 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] In addition, 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 formed by bending (constricting) in the insertion direction of the filter cloth tube. In this attachment method, an annular projection for preventing the filter cloth tube from falling (the fitting portion 5 in FIG. 1 of Patent Document 9; see the press contact holding portion 3b in FIG. 2 of Patent Document 10) is formed on the inner peripheral wall of the tip of the burring portion formed by bending, and the upper end of the filter cloth tube inserted into the burring portion is supported by this annular projection and held inside the tube of the burring portion.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Patent Document 6

Patent Document 7

[0008] [Non-Patent Document 1] Edited by the Chemical Engineering Society of Japan, "Revised Sixth Edition Chemical Engineering Handbook", Maruzen Co., Ltd., February 25, 1999, ISBN: 4-621-04535-0, pp. 824-825. [Non-Patent Document 2] Written by Kuniaki Owatari, "Understanding Press Working Best (Mechanism Illustration Series 69)", Technical Review Publishing Co., Ltd., May 1, 2021, ISBN: 978-4297120122, pp. 120-121, 136-137. [Summary of the Invention] [Problems to be Solved by the Invention]

[0009] The mounting structure of the filter cloth mounting part, which sandwiches the hole edge of the filter cloth mounting hole as described in Patent Documents 1 to 5 with the bulging parts formed by two core strings at the opening end of the filter cloth tube, is currently the most widely used. However, in this method, the tip of the opening end of the filter cloth tube protrudes from the filter cloth mounting hole to the upper part of the partition plate (see FIGS. 13(a) and (b), FIG. 7 of Patent Document 3, etc.). In actual bag filter equipment, during maintenance, the operator walks on the upper surface of the partition plate to perform operations such as replacing the filter cloth tube. At this time, if the tip of the opening end of the filter cloth tube protrudes to the upper part of the partition plate, the operator may accidentally kick the tip of the opening end of the filter cloth tube, resulting in a gap between the outer surface of the tip of the opening end of the filter cloth tube and the hole edge of the filter cloth mounting hole, which may cause a problem that the dust collection performance of the bag filter equipment deteriorates. Also, when replacing the filter cloth tube, the operator performs an operation of pressing and contracting the opening end of the filter cloth tube by hand and then detaching and attaching the opening end to the hole edge of the filter cloth mounting hole. At this time, sometimes the operator accidentally drops the filter cloth tube from the filter cloth mounting hole under the partition plate (hereinafter referred to as "filter cloth tube dropping accident"). In this case, the operation of recovering the filter cloth tube dropped from below the partition plate is very difficult, which causes a problem of reducing the workability during maintenance.

[0010] The problem of the filter cloth tube dropping accident during this operation can also occur similarly in the case of the mounting structure of the filter cloth mounting part as described in Patent Document 6. In the case of the mounting structure of the filter cloth mounting part as described in Patent Document 6, furthermore, since two fitting grooves are provided in the hole of the filter cloth mounting hole at intervals, it is necessary to make the partition plate several centimeters thick, which results in high cost and very difficult processing during manufacturing.

[0011] On the other hand, in the method of mounting a collar on the filter cloth mounting hole described in Patent Documents 7 and 8, and the method of forming a burring on the filter cloth mounting hole described in Patent Documents 9 and 10, the tip of the opening end of the filter cloth tube does not protrude to the upper part of the partition plate when the filter cloth tube is mounted, and the problem of the filter cloth tube dropping accident during operation does not occur due to the annular protrusions on the inner peripheral wall of the collar or burring.

[0012] However, as shown in FIG. 2 of Patent Document 7 and FIG. 1 of Patent Document 8, forming an annular concave groove at the upper end of the colored outer wall and fitting the edge of the filter cloth mounting hole into this concave groove is actually not feasible. This is because in bag filter equipment, during operation, the interior becomes high-temperature, so the partition plate and the color are usually made of metal. To fit a metal ring into a metal annular concave groove, it is necessary to deform the color, but it is impossible to deform the metal annular concave groove by bending it in the radial direction. Also, as shown in FIG. 1 of Patent Document 7, it is possible to weld and fix the upper end of the color to the edge of the filter cloth mounting hole. However, in ordinary bag filter equipment, a very large number of filter cloth mounting holes are provided in the partition plate, and welding and fixing the color to all of them requires a great deal of labor in manufacturing, and there is a problem that the manufacturing cost is high.

[0013] Also, as shown in FIG. 1 of Patent Document 9, forming burring in the filter cloth mounting hole of a metal partition plate and processing it so that the tip of the burring has a reduced diameter is also difficult to process. Further, as shown in FIG. 2 of Patent Document 9, forming burring in the filter cloth mounting hole of a metal partition plate and forming an annular projection (3b) on the inner peripheral portion of the burring cannot be manufactured by ordinary pressing, and it is necessary to separately weld and attach the annular projection (3b), which requires a great deal of labor in manufacturing, and there is a problem that the manufacturing cost is high.

[0014] Therefore, an object of the present invention is to provide an attachment structure of a filter cloth mounting portion, a manufacturing method thereof, and a filter cloth attachment method that have no fear of a filter cloth tube dropping accident, are suitable for mass production at a low manufacturing cost, and are also excellent in dustproof sealing performance.

Means for Solving the Problems

[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 rough gas chamber into which dust-containing gas flows and a pure gas chamber from 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 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 protrude toward one chamber side of the partition plate, a filter cloth mounting collar that is formed in a short tube shape and is press-fitted into the tube of the burring part so that at least a partial section of the outer peripheral wall is 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, characterized by comprising

[0016] According to this configuration, since the filter cloth mounting collar is formed into a crimping structure to the burring portion, the attachment of the filter cloth to the filter cloth mounting hole 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 portion due to heat, vibration, etc. does not occur, and a high dust-proof sealing property is maintained. Further, the forming of the burring portion of the partition plate into the filter cloth mounting hole can be easily performed in one to two steps by drawing forming (burring process; see Non-Patent Document 2) using a burring punch. Also, since the attachment of the filter cloth mounting collar to the burring portion of the filter cloth mounting hole of the partition plate is completed in one step by pressing, 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 portion, by utilizing the repulsive characteristics of the materials constituting the burring portion and the filter cloth mounting collar, the burring portion and the filter cloth mounting collar can be firmly integrated without the intervention of an object such as packing, and the dust-proof sealing property of the connection portion between the two can be enhanced. Also, since it has a double structure in which the filter cloth mounting collar is press-fitted into the burring portion, the filter cloth mounting collar also functions as a buffer material between the partition plate and the coating tube. Therefore, the dust-proof sealing property 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 portion 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 portions 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 portions is press-fitted into the pipe of the burring portion so as to be in close contact with the inner wall of the burring portion.

[0018] According to this configuration, between the burring portion at the hole edge of the filter cloth mounting hole of the partition plate and the filter cloth mounting collar, since two or more diameter-expanded protrusions are crimped to the inner wall of the burring portion, a dust-proof seal is made between the burring portion and the filter cloth mounting collar. Further, even if a minute gap is formed between the diameter-expanded protrusion and the inner wall of the burring portion due to manufacturing tolerances, vibrations during operation, etc., since there is a sealed space sandwiched by two adjacent diameter-expanded protrusions between the filter cloth mounting collar and the burring portion, during operation of the bag filter equipment, this sealed space is sealed by dust, thus preventing a reduction in dust-proof sealing performance.

[0019] The third configuration of the mounting structure of the filter cloth mounting portion according to the present invention is, in the said first configuration, On the end portion of the filter cloth mounting collar opposite to the side where the stopper portion is formed, an annular plate-shaped flange portion is formed, The filter cloth mounting collar is characterized in that the surface of the partition plate opposite to the side where the burring portion protrudes and the flange portion are in close contact.

[0020] According to this configuration, by bringing the partition plate and the flange portion of the filter cloth mounting collar into close contact, the dust-proof sealing performance between the partition plate and the filter cloth mounting collar can be made higher.

[0021] The fourth configuration of the mounting structure of the filter cloth mounting portion according to the present invention is, in the said first configuration, The stopper portion is formed by reducing the inner diameter of the tube of the filter cloth mounting collar, An annular plate spring snap ring is sewn into the open end of the filter cloth tube, The filter cloth tube is inserted into the tube of the filter cloth mounting collar such that the blind end side faces the side where the burring portion of the partition plate protrudes, and the open end of the filter cloth tube does not protrude outside 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 crimped to the inner wall of the portion of the tube of the filter cloth mounting collar where the inner diameter is larger than that of the stopper portion.

[0022] According to this configuration, since the portion of the open end where the filter cloth mounting collar or the snap ring of the filter cloth tube is sewn is not protruded on the surface of the partition plate, there are no protrusions on the partition plate even when the filter cloth tube is mounted, and the workability is improved during maintenance such as when the filter cloth tube is detached or attached, and accidents such as stepping off of the filter cloth tube are eliminated.

[0023] The fifth configuration of the mounting structure of the filter cloth mounting portion according to the present invention is, in the first configuration, the stopper portion is formed by expanding the outer diameter of the tube of the filter cloth mounting collar, the filter cloth mounting collar is formed such that the stopper portion protrudes from the tip of the burring portion, and a seated 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 as to cover the section from the stopper portion to the seated portion of the filter cloth mounting collar, with the blind end side being the side where the burring portion of the partition plate protrudes, characterized in that it is provided with a constricting band that constricts from the outside the section where the tip of the open end side of the filter cloth tube fits into the seated portion.

[0024] According to this configuration, the mounting structure of the filter cloth mounting portion of the present invention can also be applied to a filter cloth tube (band type filter cloth tube) that is constrictively fixed to the partition plate using a constricting band.

[0025] The manufacturing method of the filter cloth mounting portion according to the present invention is a manufacturing method of a filter cloth mounting portion that closely fixes the open end of the filter cloth tube to a filter cloth mounting hole in a bag filter facility including a partition plate that partitions between a raw gas chamber into which dust-containing gas flows and a pure gas chamber from which clean gas obtained by separating and removing dust from the dust-containing gas flows out, a plurality of filter cloth mounting holes formed in the partition plate, and a filter cloth tube having a tubular shape that is mounted in each filter cloth mounting hole and has one end as a blind end and the other end as an open end. On the hole edges of the respective filter cloth mounting holes of the partition plate, a short tube ring-shaped burring portion is formed so as to protrude toward one chamber side of the partition plate. A filter cloth mounting collar, which is formed in a short tube shape and has a stopper portion formed at one end side where the inner diameter of the tube is reduced or the outer diameter of the tube is enlarged, It is characterized in that it is press-fitted into the tube of the burring portion so that at least a partial section of the outer peripheral wall is in close contact with the inner wall of the burring portion.

[0026] The filter cloth mounting method according to the present invention is a filter cloth mounting method for hermetically fixing the open end of the filter cloth tube to the filter cloth mounting hole in a bag filter facility including a partition plate that partitions between a rough gas chamber into which dust-containing gas flows and a pure gas chamber from which clean gas obtained by separating and removing dust from the dust-containing gas flows out, a plurality of filter cloth mounting holes formed in the partition plate, and a filter cloth tube that is attached to each of the filter cloth mounting holes, has a tubular shape with one end being a blind end and the other end being an open end, and has a snap ring made of an annular leaf spring sewn into the open end. In this method, On the hole edges of the respective filter cloth mounting holes of the partition plate, a short tube ring-shaped burring portion is formed so as to protrude toward one chamber side of the partition plate. A filter cloth mounting collar, which is formed in a short tube shape and has a stopper portion formed at one end side where the inner diameter of the tube is reduced, While press-fitting it into the tube of the burring portion so that at least a partial section of the outer peripheral wall is in close contact with the inner wall of the burring portion, Insert the filter cloth tube into the tube of the filter cloth mounting collar so that the blind end side is the side where the burring portion of the partition plate protrudes, and insert the filter cloth tube through the tube of the filter cloth mounting collar until its open end does not protrude outside the tube of the filter cloth mounting collar. It is characterized in that the outer surface of the open end of the filter cloth tube is pressed against the inner wall of the portion of the tube of the filter cloth mounting collar where the inner diameter is larger than that of the stopper portion by the elasticity of the snap ring.

Advantages of the Invention

[0027] As described above, according to the present invention, by adopting a mounting structure for the filter cloth mounting portion in which the filter cloth mounting collar is brought into close contact with the burring portion, it is possible to manufacture at low manufacturing cost and provide a mounting structure for the filter cloth mounting portion suitable for mass production and a manufacturing method thereof. Further, by press-fitting the filter cloth mounting collar into the burring portion and utilizing the repulsive characteristics of the materials constituting the burring portion and the filter cloth mounting collar, the burring portion and the filter cloth mounting collar can be firmly integrated without the intervention of items such as packings, and the dust sealing property of the connection portion between the two can be enhanced. Further, by adopting a double structure in which the filter cloth mounting collar is press-fitted into the burring portion, the filter cloth mounting collar also functions as a buffer material between the partition plate and the coating tube, so that the dust sealing property between the filter cloth mounting collar and the partition plate can be further improved as compared with the prior art. Further, by inserting and mounting the open end of the filter cloth tube into the tube of the filter cloth mounting collar so as not to protrude outward from the inside of the tube of the filter cloth mounting collar, it is possible to prevent the filter cloth tube from falling during maintenance.

Brief Description of the Drawings

[0028]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Mode for Carrying Out the Invention

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

Example

[0030] FIG. 1 is an exploded perspective view of the attachment structure of the filter cloth mounting part according to Example 1 of the present invention. FIG. 1 shows a state where the filter cloth tube is not fitted. Further, in FIG. 1, among the filter cloth attachment holes 1a that open in the partition plate 1, the filter cloth attachment holes 1a in the columns other than the central column (front column and rear column) show a state before the filter cloth attachment collar 2 is press-fitted. FIG. 2 is a cross-sectional view of the attachment structure of the filter cloth mounting part of FIG. 1. FIG. 2(a) shows a state where the filter cloth attachment collar 2 is not fitted into the burring part 1b, FIG. 2(b) shows a state where the filter cloth attachment collar 2 is fitted into the burring part 1b, and FIG. 2(c) shows a state where the filter cloth attachment collar 2 is fitted into the burring part 1b and the filter cloth tube 3 is further attached. FIG. 3 is an enlarged cross-sectional view of the portion of the dotted line frame A in FIG. 2. FIG. 3 shows a state where the filter cloth tube is not fitted. FIG. 4 is an enlarged cross-sectional view of the portion of the dotted line frame B in FIG. 2. FIG. 4 shows a state where the filter cloth tube is fitted.

[0031] The mounting structure of the filter cloth mounting part in this embodiment is a partition plate 1 (also refer to FIGS. 11 and 12) that partitions between a rough 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 1a formed in the partition plate 1, and a filter cloth tube 3 (refer to FIG. 2) having a tubular filter cloth mounted in each filter cloth mounting hole 1a, 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 for closely fixing the open end of the filter cloth tube to the filter cloth mounting hole 1a. Incidentally, the bag filter facility to which this mounting structure is applied is applicable to both a method of suspending the filter cloth tube downward from the partition plate as shown in FIG. 11 and a method of lifting the filter cloth tube upward above the partition plate as shown in FIG. 12.

[0032] In the mounting structure of this embodiment, (1) A short tube ring-shaped burring part 1b formed by drawing the hole edge of the filter cloth mounting hole 1a of the metal partition plate 1 so as to protrude toward one chamber side of the partition plate 1 (the lower chamber side of the partition plate 1 in FIGS. 1 to 4), (2) A metal filter cloth mounting collar 2 formed in a short tube shape and press-fitted into the tube of the burring part 1b so that at least a partial section of the outer peripheral wall 2a (in this embodiment, the sections L1 and L2 at the tip ends of the two enlarged diameter protrusions 2d (refer to FIG. 3)) is in close contact with the inner wall of the burring part 1b over the entire circumference.

[0033] At the end of the filter cloth mounting collar 2 in the protruding direction of the burring part 1b (downward in FIGS. 1 to 4), a stopper part 2b that reduces the inner diameter of the tube of the filter cloth mounting collar 2 is formed. The stopper part 2b is for hooking the part on the open end side of the filter cloth tube 3 to prevent the filter cloth tube 3 from falling (in the case of the method of suspending the filter cloth tube downward from the partition plate (refer to FIG. 11)) or slipping upward (in the case of the method of lifting the filter cloth tube upward above the partition plate (refer to FIG. 12)).

[0034] Further, at the end of the filter cloth mounting collar 2 on the side opposite to the stopper portion 2b, an annular flange portion 2c is formed so as to expand outward of the pipe. Further, on the outer surface of the filter cloth mounting collar 2 between the stopper portion 2b and the flange portion 2c, two diameter-expanded protrusion portions 2d that expand the outer peripheral wall of the filter cloth mounting collar 2 are formed.

[0035] In a state where the filter cloth mounting collar 2 is press-fitted into the pipe of the burring portion 1b (see FIGS. 2 and 3), each of the diameter-expanded protrusion portions 2d, 2d is crimped to the inner wall of the burring portion 1b. Here, "press-fitting" means inserting with pressure. "Crimping" means a state in which two objects in contact with each other are closely adhered so as to push against each other with internal stress. In FIG. 3, the sections L1, L2 at the tip portions of the diameter-expanded protrusion portions 2d, 2d on the outer wall of the filter cloth mounting collar 2 are crimped to the inner wall of the burring portion 1b. Further, the surface of the partition plate 1 on the side opposite to the side where the burring portion 1b protrudes (the upper surface in FIGS. 1 to 4) and the flange portion 2c are in close contact (see FIGS. 3 and 4). In addition, in order to enhance the dust-proof sealing property when the filter cloth mounting collar 2 is press-fitted, in the state before the filter cloth mounting collar 2 is press-fitted, the outer diameter of the diameter-expanded protrusion portion 2d is slightly larger than the inner diameter of the burring portion 1b (the inner diameter of the straight pipe portion of the burring portion 1b (excluding the base end portion expanded in a trumpet shape)). This is to crimp the diameter-expanded protrusion portions 2d, 2d to the inner wall of the burring portion 1b when the filter cloth mounting collar 2 is press-fitted into the burring portion 1b.

[0036] The diameter-expanded protrusion portions 2d, 2d on the outer peripheral wall of the filter cloth mounting collar 2 are formed by press-forming the pipe body of the filter cloth mounting collar 2, and annular pipe inner concave grooves 2e, 2e are formed on the inner peripheral wall side of the pipe body of this diameter-expanded protrusion portion 2d, 2d (see FIG. 3).

[0037] When manufacturing the mounting structure as shown in FIGS. 1, 2(b), and 3, the filter cloth mounting collar 2 is press-fitted into the pipe of the burring portion 1b at high pressure by a press or the like. For this reason, the filter cloth mounting collar 2 is not easily removed from the burring portion 1b.

[0038] Next, there is the filter cloth tube 3 attached to the filter cloth mounting collar 2. In this embodiment, similar to what was described with reference to FIG. 13 in the [Background Art] section, a filter cloth tube with a snap ring sewn into the open end is used. In FIGS. 2(c) and 4, the filter cloth tube 3 is entirely composed of a filter cloth 3a that captures dust. The filter cloth 3a on the open end side of the filter cloth tube 3 is folded in half as shown in FIG. 4. Between the folded filter cloth 3a, a snap ring 3b made of an annular leaf spring and two annular core strings 3c, 3c are sewn in. In the examples of FIGS. 2(c) and 4, the filter cloth 3a is folded inward on the open end side, but it can of course be folded outward. The snap ring 3b is the same as that shown in FIG. 13(d). The core strings 3c, 3c are sewn in at two positions, above and below, between the outer surface of the snap ring 3b and the filter cloth 3a on its outside (see FIG. 4). The elastic force of the snap ring 3b always acts on the open end of the filter cloth tube 3 in a direction to expand the diameter. Also, on the outer surface of the filter cloth 3a at the open end of the filter cloth tube 3, annular protrusions 3d, 3d are formed by being partially spread by the two core strings 3c, 3c.

[0039] When attaching the filter cloth tube 3 to the partition plate 1, insert the filter cloth tube 3 from the blind end side into the tube of the filter cloth mounting collar 2 from the side of the flange portion 2c of the filter cloth mounting collar 2 until the portion where the snap ring 3b of the open end of the filter cloth tube 3 is sewn in (hereinafter referred to as the "open end portion") 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 portion into the filter cloth mounting collar 2, the operator inserts the open end portion into the tube of the filter cloth mounting collar 2 while pressing the open end portion by hand so as to bend the snap ring 3b inward (see, for example, FIGS. 4 and 5 of Patent Document 3). Then, when the hand is released, due to the elasticity of the snap ring 3b, the entire circumference of the outer surface of the filter cloth 3a at the open end portion is brought into close contact with the inner surface of the filter cloth mounting collar 2.

[0040] Since the tip of the filter cloth mounting collar 2 has a stopper portion 2b, when an operator inserts the opening end portion of the filter cloth tube 3 into the tube of the filter cloth mounting collar 2, the opening end portion cannot pass through the tube of the reduced-diameter stopper portion 2b. Therefore, during the insertion operation, the opening end of the filter cloth tube 3 slips through the tube of the filter cloth mounting collar 2 and drops below the partition plate 1 (in the case of the method of suspending the filter cloth tube below the partition plate (see Fig. 11)) or slips through above the partition plate 1 (in the case of the method of suspending the filter cloth tube above the partition plate (see Fig. 12)). Such accidents are prevented.

[0041] Furthermore, if necessary, after mounting the filter cloth tube 3 on the filter cloth mounting collar 2, as shown in Fig. 6, a cage-shaped retainer 4 for maintaining the shape of the filter cloth 3a is inserted into the tube of the filter cloth tube 3. Regarding the retainer 4, since it has no direct relation to the present invention, detailed description thereof is omitted.

[0042] In this way, the state where the opening end portion of the filter cloth tube 3 is mounted in the tube of the filter cloth mounting collar 2 is the filter cloth tube mounting state as shown in Figs. 2(c) and 4. In this way, the outer surface of the filter cloth 3a at the opening end portion of the filter cloth tube 3 is in close contact with the inner peripheral wall of the filter cloth mounting collar 2, blocking the passage of dust, and a dustproof seal is made between the opening end portion of the filter cloth tube 3 and the filter cloth mounting collar 2. Also, between the burring portion 1b at the edge of the filter cloth mounting hole 1a of the partition plate 1 and the filter cloth mounting collar 2, since the expanded diameter protrusions 2d, 2d are crimped to the inner wall of the burring portion 1b, a dustproof seal is also made between the burring portion 1b and the filter cloth mounting collar 2. Also, even if a minute gap is generated between the expanded diameter protrusions 2d, 2d and the inner wall of the burring portion 1b due to manufacturing tolerances or vibrations during operation, since there is a sealed space sandwiched by the two expanded diameter protrusions 2d, 2d between the filter cloth mounting collar 2 and the burring portion 1b, when the bag filter facility is in operation, this sealed space is sealed by dust, preventing a decrease in dustproof sealing performance.

[0043] Also, in the state where the filter cloth tube is attached, the size is adjusted so that the tip 3e of the opening end of the filter cloth tube 3 does not protrude outward from the inside of the tube of the filter cloth mounting collar 2. Thereby, when an operator mounts on the upper surface of the partition plate 1 and performs maintenance work such as replacement of the filter cloth tube 3, the operator does not accidentally kick the tip 3e of the opening end of the filter cloth tube 3, and between the outer surface of the tip 3e of the opening end of the filter cloth tube and the inner wall of the tube of the filter cloth mounting collar 2 Accidents such as the formation of a gap and the impairment of the dustproof sealing property are prevented.

[0044] In particular, when using the retainer 4 as shown in Fig. 6, since the filter cloth mounting collar 2 and the opening end of the filter cloth tube 3 do not protrude from the surface of the partition plate 1, the workability during attachment and detachment of the retainer 4 is improved. Also, during the attachment and detachment work of the retainer 4, etc., accidents such as the operator accidentally stepping on the opening end of the filter cloth tube 3 and the filter cloth tube 3 falling below the partition plate 1 are eliminated.

[0045] In addition, in the embodiments shown in Figs. 2(c) and 4, further, the positions of the core strings 3c, 3c and the inner tube concave grooves 2e, 2e are adjusted so that the annular protrusions 3d, 3d formed on the outer surface of the filter cloth 3a at the opening end of the filter cloth tube 3 fit into the inner tube concave grooves 2e, 2e formed on the inner peripheral wall of the filter cloth mounting collar 2. By fitting the annular protrusions 3d, 3d into the inner tube concave grooves 2e, 2e in this way, the dustproof property of the connection part can be further enhanced.

[0046] Also, for the filter cloth tube 3, it is also possible to use one without the core strings 3c, 3c. Fig. 5 shows an enlarged cross-sectional view of the attachment structure of the filter cloth mounting portion when the filter cloth tube 3 without the core string is used. The enlarged cross-sectional view of Fig. 5 corresponds to the portion of the dotted line frame B in Fig. 2. In Fig. 5, the constituent parts corresponding to those in Fig. 4 are denoted by the same reference numerals. 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 protrusion 3d on the outer surface of the opening end of the filter cloth tube 3.

[0047] Finally, in the mounting structure of the present invention, the advantages of providing a burring portion 1b in the filter cloth mounting hole 1a of the partition plate 1 and press-fitting the filter cloth mounting collar 2 into the burring portion 1b will be described.

[0048] First, with such a structure, during the manufacture of the mounting structure, the attachment of the filter cloth mounting collar 2 to the partition plate 1 is completed in one step. This is because the filter cloth mounting collar 2 is simply press-fitted into the burring portion 1b using a press or the like. The burring process of the hole edge of the filter cloth mounting hole 1a of the partition plate 1 can also be easily performed in one to two steps by punch forming using a burring punch, and the filter cloth mounting collar 2 can also be easily mass-produced by press working. Therefore, the manufacturing cost is also low. On the other hand, for example, in a configuration where a collar for mounting a filter cloth as shown in FIGS. 1 and 4 of Patent Document 7 is welded to the hole edge of the filter cloth mounting hole, since it is necessary to weld the filter cloth mounting collar to each of the hole edges of a large number of filter cloth mounting holes, a very large number of manufacturing steps are required. Therefore, the manufacturing cost is also high.

[0049] Also, as described above, since the attachment of the filter cloth mounting collar 2 to the partition plate 1 can be completed in one step, the partition plate 1 can be easily replaced when the bag filter equipment body becomes old.

[0050] In addition, regarding a configuration in which an annular groove (for example, refer to reference numeral 102 in FIG. 2 of Patent Document 7) formed on the outer periphery of the upper end of a collar for mounting a filter cloth as shown in FIG. 2 of Patent Document 7 or FIG. 1 of Patent Document 8 is fitted into the filter cloth mounting hole of the partition plate, it is achievable if the collar is made of a flexible material such as resin, but when the collar is made of metal, it is considered practically difficult to fit it because it is impossible to bend the metal annular groove inward and fit it into the filter cloth mounting hole of the metal partition plate.

[0051] Also, in the case of welding as described in Patent Document 7 and the like, problems such as poor welding during manufacture and deterioration or breakage of the welded portion due to distortion such as thermal expansion and vibration during operation become issues, but in the mounting structure of the present invention, such problems do not occur.

[0052] In addition, in the mounting structure of the present invention, by utilizing the repulsion of the material properties of the metal, the caulking portion 1b of the partition plate 1 and the filter cloth mounting collar 2 are integrated without the intervention of items such as packing. Therefore, a high dust-proof sealing property is always maintained between the filter cloth mounting collar 2 and the partition plate 1. Also, compared with ordinary caulking seals, it is simpler and does not loosen.

[0053] In addition, in the mounting structure of the present invention, since it has a double structure in which the filter cloth mounting collar 2 is press-fitted into the caulking portion 1b, there is an advantage that vibration is less likely to be transmitted between the partition plate 1 and the open end portion of the filter cloth tube 3 during the operation of the bag filter facility. In this regard, as shown in Fig. 1 of Patent Document 9 and Patent Document 10, when the open end portion of the filter cloth tube is directly attached to the caulking (for example, refer to reference numeral 5 in Fig. 1 of Patent Document 9) formed at the hole edge of the filter cloth mounting hole of the partition plate, the vibration and deflection generated in the partition plate during operation are directly transmitted to the open end portion of the filter cloth tube. Therefore, it is considered that the dust-proof sealing property between the open end portion of the filter cloth tube and the caulking decreases. On the other hand, in the mounting structure of the present invention, since the filter cloth mounting collar 2 also functions as a buffer material, vibrations, deflections, etc. generated in the partition plate 1 during operation are not directly transmitted to the connection portion of the open end portion of the filter cloth tube 3. Therefore, a high dust-proof sealing property is maintained.

[0054] Also, considering actual manufacturing, as shown in Fig. 1 of Patent Document 9, processing such as reducing the diameter of the tip of the caulking (refer to reference numeral 5 in Fig. 1 of Patent Document 9) is difficult to perform by ordinary caulking punch processing and requires special processing techniques. In contrast, in the mounting structure of the present invention, the caulking portion 1b is an ordinary straight short tubular caulking and can be manufactured by caulking processing using a general caulking punch (for example, refer to Non-Patent Document 2).

Example

[0055] In Example 2, the mounting structure of the filter cloth mounting portion in the present invention is applied to a bag filter facility of a method of lifting a filter cloth tube as shown in FIG. 12 above a partition plate, and an example using a filter cloth tube 3 that does not have a snap ring and is fixed to the partition plate 1 using a band (band type filter cloth tube) will be described.

[0056] FIG. 7 is a cross-sectional view of the mounting structure of the filter cloth mounting portion of Example 2 of the present invention. In FIG. 7, the constituent parts corresponding to those in FIG. 5 are denoted by the same reference numerals. In Example 2, the partition plate 1 partitions the pure gas chamber and the raw gas chamber as shown in FIG. 12, and the filter cloth tube 3 is lifted and installed above the partition plate 1 with the open end side facing downward and the blind end side facing upward as shown in FIG. 12. In this case, the burring portion 1b formed at the hole edge of the filter cloth mounting hole 1a of the partition plate 1 is formed so as to project in a short tube ring shape toward the upper pure gas chamber.

[0057] The filter cloth mounting collar 2 is press-fitted into the tube of the burring portion 1b from below the filter cloth mounting hole 1a with the flange portion 2c facing downward. Further, in the filter cloth mounting collar 2 of the present embodiment, two enlarged diameter protruding portions 2d, 2d are formed in an annular shape at a position close to the flange portion 2c on the outer peripheral wall of the tube, and at the tube end on the side opposite to the flange portion 2c, a stopper portion 2b' is formed that enlarges the outer diameter of the tube of the filter cloth mounting collar and protrudes in an annular shape without corners. And between the upper enlarged diameter protruding portion 2d and the stopper portion 2b', an adhered seat portion 2f which is a straight tubular section is formed.

[0058] Note that the maximum diameter of the stopper portion 2b' is configured to be equal to or less than the maximum diameter of the enlarged diameter protruding portion 2d (preferably, equal to or less than 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 diameter protruding portion 2d, the stopper portion 2b' cannot pass through the tube of the burring portion 1b when the filter cloth mounting collar 2 is press-fitted into the tube of the burring portion 1b.

[0059] On one hand, the filter cloth tube 3 is fitted so that its open end faces the stopper portion 2b' of the filter cloth mounting collar 2 and covers the section from the stopper portion 2b' to the seating portion 2f. And the section (constriction section 3f) where the seating portion 2f at the tip on the open end side of the filter cloth tube 3 is fitted is constricted (fastened) by the constriction band 5 from the outside and fixed. The open end of the filter cloth tube 3 constricted by the constriction band 5 is locked by the stopper portion 2b' protruding in an annular shape so as not to come off.

[0060] Thus, the mounting structure of the filter cloth mounting portion of the present invention can also be applied to the band-type filter cloth tube 3 fixed to the partition plate 1 using the constriction band.

Example

[0061] In Example 3, regarding the structure in the present invention for bringing at least a partial section of the outer peripheral wall of the filter cloth mounting collar 2 into close contact with the inner wall of the burring portion 1b, other configuration examples are shown.

[0062] FIG. 8 is a cross-sectional view of the mounting structure of the filter cloth mounting portion of Example 3. In this example, compared with Example 1, the structure of the diameter-expanded protrusion 2d of the filter cloth mounting collar 2 is different. In this example, there is only one diameter-expanded protrusion 2d. The outer peripheral wall of the filter cloth mounting collar 2 is in pressure contact with the inner wall of the burring portion 1b over the entire circumference in the section indicated by L1 in FIG. 8. Also, similar to Example 1, the surface of the partition plate 1 on the side opposite to the side where the burring portion 1b protrudes is in close contact with the flange portion 2c. In this case, compared with the structure of Example 1, the dust-proof sealing property is lower, but in the present invention, it is also possible to configure in such a form.

Example

[0063] In Example 4, regarding the structure in the present invention for bringing at least a partial section of the outer peripheral wall of the filter cloth mounting collar 2 into close contact with the inner wall of the burring portion 1b, other configuration examples are shown.

[0064] FIG. 9 is a cross-sectional view of the mounting structure of the filter cloth mounting portion according to Example 4. In this example, compared with Example 1, the structure of the diameter-expanded protrusion portion 2d of the filter cloth mounting collar 2 is different. In this example, there is only one diameter-expanded protrusion portion 2d, and it is wider than in the case of Example 3. The outer peripheral wall of the filter cloth mounting collar 2 is crimped to the inner wall of the burring portion 1b over the entire circumference in the section indicated by L1 in FIG. 9. Also, similar to Example 1, the surface of the partition plate 1 on the side opposite to the side where the burring portion 1b protrudes is in close contact with the flange portion 2c. Also in this case, compared with the structure of Example 1, the dust-proof sealing property is lower, but in the present invention, it is also possible to configure it in such a form.

Example

[0065] In Example 5, regarding the structure in which at least a partial section of the outer peripheral wall of the filter cloth mounting collar 2 in the present invention is brought into close contact with the inner wall of the burring portion 1b, other configuration examples are shown.

[0066] FIG. 10 is a cross-sectional view of the mounting structure of the filter cloth mounting portion according to Example 5. In this example, compared with Example 3, the position of the diameter-expanded protrusion portion 2d of the filter cloth mounting collar 2 is different. In this example, there is only one diameter-expanded protrusion portion 2d, and its position is near the lower end of the burring portion 1b. The outer peripheral wall of the filter cloth mounting collar 2 is crimped to the inner wall of the burring portion 1b over the entire circumference in the section indicated by L1 in FIG. 10. Also, similar to Example 1, the surface of the partition plate 1 on the side opposite to the side where the burring portion 1b protrudes is in close contact with the flange portion 2c. Also in this case, compared with the structure of Example 1, the dust-proof sealing property is lower, but in the present invention, it is also possible to configure it in such a form.

Explanation of Reference Numerals

[0067] 1 Partition plate 1a Filter cloth mounting hole 1b Burring portion 2 Filter cloth mounting collar 2a Outer peripheral wall 2b, 2b’ Stopper portion 2c Flange portion 2d Diameter-expanded protrusion portion 2e Inner concave groove in the pipe 2f Mounting seat part 3 Filter cloth tube 3a Filter cloth 3b Snap ring 3c Core string 3d Annular protrusion 3e Tip of the open end 3f Constriction section 4 Retainer 5 Constricting band

Claims

**Claim 1**: A bag filter facility comprising a partition plate separating a raw gas chamber into which a dust-containing gas flows and a pure gas chamber from which a clean gas obtained by separating and removing dust from the dust-containing gas flows out, a plurality of filter cloth mounting holes formed in the partition plate, and filter cloth tubes each having a tubular filter cloth with one end being a blind end and the other end being an open end and attached to each of the filter cloth mounting holes. The mounting structure of the filter cloth mounting portion for closely fixing the open end of the filter cloth tube to the filter cloth mounting hole, a burring portion in the form of a short tube ring formed by shaping the edge of the filter cloth mounting hole of the partition plate to project toward one chamber side of the partition plate, a filter cloth mounting collar formed in a short tubular shape and press-fitted into the tube of the burring portion such that at least a partial section of the outer peripheral wall is in close contact with the inner wall of the burring portion over the entire circumference, a stopper portion formed by reducing the inner 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 portion, characterized by comprising a snap ring made of an annular plate spring being sewn into the open end of the filter cloth tube, the filter cloth tube being inserted into the tube of the filter cloth mounting collar such that the blind end side faces the side where the burring portion of the partition plate projects and the open end of the filter cloth tube does not project out from the tube of the filter cloth mounting collar, the outer surface of the open end of the filter cloth tube being press-bonded to the inner wall of the portion of the tube of the filter cloth mounting collar where the inner diameter is larger than that of the stopper portion by the elasticity of the snap ring. The mounting structure of the filter cloth mounting portion. **Claim 2**: A bag filter facility comprising a partition plate separating a raw gas chamber into which a dust-containing gas flows and a pure gas chamber from which a clean gas obtained by separating and removing dust from the dust-containing gas flows out, a plurality of filter cloth mounting holes formed in the partition plate, and filter cloth tubes each having a tubular filter cloth with one end being a blind end and the other end being an open end and attached to each of the filter cloth mounting holes. The mounting structure of the filter cloth mounting portion for closely fixing the open end of the filter cloth tube to the filter cloth mounting hole, a burring portion in the form of a short tube ring formed by shaping the edge of the filter cloth mounting hole of the partition plate to project toward one chamber side of the partition plate, a filter cloth mounting collar formed in a short tubular shape and press-fitted into the tube of the burring portion such that at least a partial section of the outer peripheral wall is in close contact with the inner wall of the burring portion over the entire circumference, On the end side of the filter cloth mounting collar in the protruding direction of the burring portion, there is a stopper portion formed by expanding the outer diameter of the tube of the filter cloth mounting collar, and it is provided with the filter cloth mounting collar is formed such that the stopper portion protrudes more than 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 the open end of the filter cloth tube covers the section from the stopper portion of the filter cloth mounting collar to the seating portion with the blind end side being the side where the burring portion of the partition plate protrudes, characterized in that it is provided with a constricting band for constricting from the outside the section of the seating portion where the tip of the open end side of the filter cloth tube is fitted. Mounting structure of the filter cloth mounting portion.

3. In a bag filter facility comprising a rough gas chamber into which dust-containing gas flows, a partition plate partitioning between the rough gas chamber and a pure gas chamber from which the cleaned gas obtained by separating and removing dust from the dust-containing gas flows out, a plurality of filter cloth mounting holes formed in the partition plate, and a filter cloth tube having 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 being sewn into the open end, a method for mounting the filter cloth tube in close contact with the open end of the filter cloth tube in the filter cloth mounting hole, a short tube ring-shaped burring portion is formed on the hole 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 which is formed in a short tubular shape and has a stopper portion formed at one end side with a reduced inner diameter of the tube, is press-fitted into the tube of the burring portion so that at least a partial section of the outer peripheral wall is in close contact with the inner wall of the burring portion, the filter cloth tube is inserted into the tube of the filter cloth mounting collar so that the blind end side is the side where the burring portion of the partition plate protrudes, and the filter cloth tube is inserted through the tube of the filter cloth mounting collar until its open end does not protrude outside the tube of the filter cloth mounting collar, characterized in that the outer surface of the open end of the filter cloth tube is crimped to the inner wall of the tube of the filter cloth mounting collar at a portion where the inner diameter of the tube is larger than that of the stopper portion by the elasticity of the snap ring. Filter cloth mounting method.

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