How to replace the filter body and filter media

Abstract

To provide a replacement method of a filtration body and a filter medium which can easily replace a filter medium.SOLUTION: A filtration body 1 is mainly composed of a support 2 which is formed in a hollow cylindrical shape and is formed with a plurality of through holes 10 and a slit 13 extending in a longitudinal direction, a wire mesh 3 which is formed in a sheet shape, is wound around the periphery in the longitudinal direction of the support 2, has both ends in a winding direction inserted into the slit 13 and serves as a filter medium, and a fixing member 4 which is freely fit into the slit 13 and fixes both ends of the wire mesh 3 to the slit 13. In such a structure, the wire mesh 3 is removal from the support 2 by removing the fixing member 4, and accordingly the wire mesh 3 can be easily replaced.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for replacing a filter body and a filter medium, and more particularly to a method for replacing a filter body and a filter medium which are hollow and cylindrical and are used to filter fluid by passing it from the outside to the inside or from the inside to the outside. [Background technology]

[0002] Patent Document 1 discloses a conventional filter body in which a cylindrical filter material is supported by a porous support and has openings at both ends in the direction of the central axis. During filtration, raw water flows in through the openings, passes through the filter material, and is discharged outward from the periphery of the filter body as filtered water. Furthermore, during backwashing, backwash water from outside the filter body flows inward from the periphery of the filter body, peels off deposits on the inner surface of the filter material, and is discharged outward from the openings. One example of such a filter body is a metal mesh filter that is integrated at the periphery by welding or the like to form a single cylindrical sheet. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-004571 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional filter bodies generally have the filter material (filter media) integrated with the support, so when the filter media deteriorates with continued use, the entire filter body needs to be replaced, which is costly.

[0005] On the other hand, in the filter body described in Patent Document 1 above, the filter material is not fixed to the support, so during maintenance it can be replaced by removing only the filter material from the open end without having to replace the entire filter body. However, it is not always easy to remove the filter material, which is welded together at the periphery and integrated, from the support that extends in the longitudinal direction, and there was a demand for a filter material that could be replaced more easily.

[0006] The present invention has been made to solve the above-mentioned problems, and has an object to provide a filter body and a method for replacing a filter medium that allow the filter medium to be easily replaced. [Means for solving the problem]

[0007] In order to achieve the above object, the invention described in claim 1 is a filter body that is hollow cylindrical and used to filter a fluid by passing it from the outside to the inside or from the inside to the outside, and includes a support body formed in a hollow cylindrical shape and having a plurality of through holes and slits extending in the longitudinal direction, and a sheet-like filter body formed around the outer circumferential direction of the support body. In a stretched state The filter medium is wound around the support member, and both ends of the filter medium in the winding direction are inserted into the slits. The filter medium is fitted into the slit, and both ends of the filter medium are inserted into the slits and fixed to the inside of the support member. The fixing member has an insertion portion to be inserted into the slit, and the insertion portion has a narrowed portion whose width in the short side direction narrows and a bulged portion whose width in the short side direction gradually widens toward the outside, and further has a pocket member inside the support that partitions a space for storing both ends of the filter material in the winding direction, and a secondary slit is formed by cutting out communicating portions in the longitudinal direction in the side peripheral surface of the pocket member, and the cutout ends separated by the secondary slit are tapered in the direction approaching each other, and the cutout ends engage with the narrowed portion and bulged portion of the insertion portion. It is something.

[0008] With this configuration, the filter medium can be removed from the support by removing the fixing member.

[0009] The invention described in claim 2 is the same as the invention described in claim 1, except that the slit is sealed by a fixing member.

[0010] This configuration prevents the material to be filtered from passing through to the secondary side without passing through the filter material. 。

[0017] Claim 3 The invention described herein further comprises, in the configuration of the invention described in claim 1 or claim 2, a gasket fitted onto the outer peripheral surface at the longitudinal end of the support body.

[0018] With this configuration, the filter medium is pressed against the longitudinal end of the support by the gasket.

[0019] Claim 4 The invention described is 3 In the configuration of the described invention, the fixing member has a cover portion whose inner surface is aligned with the outer peripheral surface of the support. Further The fixing member has an insertion portion that extends longer in the longitudinal direction than the cover portion, so that a step portion equal to the thickness of the cover portion is provided on the insertion portion side at the longitudinal end, and a gasket fits into the step portion, so that the gasket covers the longitudinal end of the filter material and the portion of the longitudinal end of the support body where the filter material is not wrapped.

[0020] This configuration prevents the gasket from coming loose and also prevents the filter material from floating.

[0021] Claim 5 The invention described in claim 1 or claim 2 further comprises a restraining member wound around the filter medium in the body of the support body.

[0022] With this configuration, the filter medium is pressed against the body of the support by the restraining member.

[0023] Claim 6 The invention described is a method for replacing a filter medium in a hollow cylindrical filter body used for filtering fluid by passing it from the outside to the inside or from the inside to the outside, and the filter body is made up of a support body formed in a hollow cylindrical shape and having a plurality of through holes and slits extending in the longitudinal direction, and a sheet-like filter body formed around the outer circumferential direction of the support body. In a stretched state The filter medium is wound around the support member, and both ends of the filter medium in the winding direction are inserted into the slits. The filter medium is fitted into the slit, and both ends of the filter medium are inserted into the slits and fixed to the inside of the support member. The fixing member has an insertion portion that is inserted into the slit, and the insertion portion has a constricted portion that narrows in width in the short side direction and a bulging portion that gradually widens in width in the short side direction toward the outside, and the support further has a pocket member that partitions a space inside the support for storing both ends of the filter material in the winding direction, and a secondary slit is formed by cutting out notches that are connected in the longitudinal direction in the side peripheral surface of the pocket member, and the cutout ends that are separated by the secondary slit are tapered in the direction approaching each other, and the cutout ends are configured to engage with the constricted portion and bulging portion of the insertion portion, The method includes a removal step of removing the fixing member from the slit and removing the filter medium, and an attachment step of attaching a new filter medium to the support.

[0024] With this configuration, the filter medium can be removed from the support by removing the fixing member. [Effects of the Invention]

[0025] As described above, in the invention of claim 1, the filter medium can be removed from the support by removing the fixing member, so that the filter medium can be easily replaced.

[0026] The invention of claim 2 has the effect of the invention of claim 1, and in addition, prevents the object to be filtered from passing through the secondary side without passing through the filter medium, thereby improving the reliability of the filter body. 。

[0030] Claim 3 In addition to the effects of the invention of claim 1 or 2, the described invention improves sealing performance because the filter medium is pressed against the longitudinal end of the support by the gasket.

[0031] Claim 4 The invention described is 3 In addition to the effects of the invention described above, the gasket is retained in place, so the fixing member is more firmly fixed. Also, the filter material is prevented from floating, so the sealing performance of the filter body is further improved.

[0032] Claim 5 In addition to the effects of the invention of claim 1 or 2, the described invention prevents the filter medium from floating because the filter medium is pressed against the body of the support by the restraining member.

[0033] Claim 6 In the described invention, the filter material can be removed from the support by removing the fixing member, so that the filter material can be easily replaced. [Brief explanation of the drawings]

[0034] [Figure 1] 1 is a perspective view showing a filter body according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view showing a support included in the filter body shown in FIG. [Figure 3] 2 is a perspective view showing a fixing member included in the filter body shown in FIG. 1. FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV shown in FIG. 3. [Figure 5] FIG. 2 is a perspective view showing a cross section of the VV line shown in FIG. [Figure 6] FIG. 4 is a perspective view showing a filter body according to a second embodiment of the present invention. [Figure 7] FIG. 7 is a perspective view showing a support included in the filter body shown in FIG. 6. [Figure 8] FIG. 7 is a perspective view showing a pocket member included in the filter body shown in FIG. 6. [Figure 9] FIG. 7 is a perspective view showing a fixing member included in the filter body shown in FIG. [Figure 10] FIG. 10 is a cross-sectional view taken along the line XX shown in FIG. [Figure 11] FIG. 7 is a perspective view showing a cross section taken along line XI-XI shown in FIG. 6. [Figure 12] FIG. 10 is a perspective view showing a filter body according to a third embodiment of the present invention. [Figure 13] FIG. 10 is a cross-sectional view showing a filtering device using a filter body according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0035] FIG. 1 is a perspective view showing a filter body according to a first embodiment of the present invention.

[0036] Referring to the figure, the filter body 1 is mainly composed of a metallic porous support body 2 formed in a hollow cylindrical shape, a wire mesh 3 formed in a sheet shape as a filter material wrapped around the circumferential periphery of the support body 2, and a rubber fixing member 4 that fixes the wire mesh 3 to the support body 2.

[0037] FIG. 2 is a perspective view showing a support included in the filter body shown in FIG.

[0038] Referring to the figure, the support body 8, which constitutes the basic framework of the support body 2, is a hollow cylinder with both longitudinal ends open, and has a plurality of through-holes 10 formed at regular intervals both vertically and horizontally. Therefore, in the filter body 1 in which the wire mesh 3 is wrapped around the outer circumferential surface of the support body 8, a fluid such as a liquid or gas containing foreign matter as the object to be filtered can be passed from the outside (primary side) to the inside (secondary side) of the filter body 1 and filtered. The filtered fluid is then discharged from both longitudinal ends open to the outside of the filter body 1. Conversely, filtration from the inside to the outside is also possible.

[0039] In addition, a slit 13 is formed in the trunk 9 of the support body 8, penetrating from the outside to the inside from one longitudinal end 11 to the other longitudinal end 12. In addition, bridging portions 14 and 15 are provided at the one longitudinal end 11 and the other longitudinal end 12 of the support body 8, bridging the upper and lower parts of the slit 13 so that the outer peripheral surface of the trunk 9 of the support body 8 is continuous.

[0040] 3 is a perspective view showing a fixing member included in the filter body shown in FIG. 1, and FIG. 4 is a cross-sectional view taken along the line IV-IV shown in FIG.

[0041] Referring to these figures, the fixing member 4 is composed of a curved plate-shaped cover portion 17 extending longitudinally along the slit 13, and a columnar insertion portion 18 integrated with one side of the cover portion 17 and extending longer than the cover portion 17 in the longitudinal direction.

[0042] The cover portion 17 is formed to have a width in the short side direction larger than that of the slit 13. Furthermore, the insertion portion 18 is formed to have a width in the short side direction that fits into the slit 13. Specifically, the largest width W of the insertion portion 18 in the short side direction is set larger than the width of the slit 13 in the short side direction. Because the fixing member 4 is made of rubber and is flexible, by aligning the fixing member 4 with the slit 13 and pressing it, the insertion portion 18 fits into the slit 13, and the fixing member 4 is attached as shown in FIG. 1. Furthermore, the cover portion 17 is not inserted into the slit 13, and the inner surface of the cover portion 17 is aligned with the outer peripheral surface of the support body 2.

[0043] Furthermore, the fixing member 4 has a size that allows it to fit into the slit 13 not only in the short direction but also in the long direction, thereby sealing the slit 13 with the fixing member 4. This configuration prevents the material to be filtered from passing through to the interior (secondary side) without passing through the wire mesh 3, thereby improving the reliability of the filter body 1.

[0044] The insertion portion 18 also has a narrowed portion 19 where the width in the short direction is narrowed. The effect of this configuration will be described later.

[0045] Next, the process of attaching the filter medium to the filter body 1 will be described.

[0046] First, the wire mesh 3 is wrapped around the support 2, and both ends of the wire mesh 3 in the wrapping direction are inserted into the slits 13. Next, the fixing members 4 are fitted into the slits 13 together with both ends of the wire mesh 3, thereby fixing the wire mesh 3 and sealing the slits 13.

[0047] The internal structure of the filter body 1 to which the wire mesh 3 is attached in this manner will be described.

[0048] FIG. 5 is a perspective view showing a cross section of the VV line shown in FIG.

[0049] Referring to the figure, wire mesh 3 is wrapped around support 2 and fixed by fixing member 4, and both ends 23a, 23b of wire mesh 3 in the wrapping direction are exposed inside support 2 through slit 13. Insertion portion 18 of fixing member 4 prevents the entire fixing member 4 from slipping out of slit 13, and the inner surface of cover portion 17 (the surface on the insertion portion 18 side) is pressed against support 2, thereby pressing wire mesh 3 sandwiched therebetween against slit 13, thereby firmly fixing wire mesh 3. In addition, the material to be filtered is prevented from passing through slit 13 without passing through wire mesh 3.

[0050] Furthermore, by wrapping the wire mesh 3 around the circumferential periphery of the support 2 in this manner and fixing it so that it is pressed against the slit 13 by the fixing member 4, when a fluid passes from the outside to the inside of the filter body 1, the fluid pressure acts in a direction that presses against the fixing member 4, which has the advantage of improving sealing properties and preventing the fixing member 4 from coming loose.

[0051] Furthermore, in the insertion portion 18 of the fixing member 4, the slit 13 fits into the narrowed portion 19 where the width in the short direction is narrowed. Therefore, the wire mesh 3 is sandwiched between the narrowed portion 19 and the slit 13, and the wire mesh 3 is further fixed to the slit 13 by the narrowed portion 19, so that the fixation of the wire mesh 3 becomes stronger.

[0052] 1, gaskets 5a and 5b are fitted to the outer peripheral surface of the support body 2 at both longitudinal ends of the support body 2. These ring-shaped gaskets press the wire mesh 3 against the longitudinal ends of the support body 2, preventing the wire mesh 3 from floating. They also prevent the fixing member 4 from accidentally coming off the slit 13.

[0053] Furthermore, due to the difference in longitudinal length between the cover portion 17 and the insertion portion 18 of the fixing member 4, a step portion 20 (see Figure 3) is created on the insertion portion 18 side at the longitudinal end of the fixing member 4, which is equal to the thickness of the cover portion 17.By adjusting the size of the gaskets 5a and 5b to this, the gaskets 5a and 5b are prevented from slipping out, and the fixing of the fixing member 4 is made even more secure.

[0054] In this case, the gaskets 5a and 5b are configured to cover the longitudinal ends of the wire mesh 3 and the portions of the longitudinal ends of the support body 2 where the wire mesh 3 is not wound. This configuration prevents the wire mesh 3 from floating around the entire periphery of the longitudinal ends and prevents the portions of the support body 2 where the wire mesh 3 is not wound from being exposed, further improving the sealing performance of the filter body 1.

[0055] When the wire mesh 3 deteriorates with continued use, the fixing member 4 can be removed from the slit 13, making it possible to remove the wire mesh 3 from the support 2. After removing the deteriorated wire mesh 3, a new wire mesh 3 can be attached to the support 2 in the same manner, making it possible to easily replace the wire mesh 3.

[0056] In the filter body 1 according to the first embodiment described above, both end portions 23a, 23b of the wire mesh 3 in the winding direction are exposed to the inside (secondary side) of the filter body 1. Therefore, if both end portions 23a, 23b of the wire mesh 3 in the winding direction are damaged during use, there is a risk that the missing wire mesh 3 may get mixed into the filtered fluid.

[0057] Next, a filter element according to a second embodiment of the present invention will be described, which is intended to solve this problem. Note that the basic configuration is similar to that of the first embodiment, so the following description will focus on the differences.

[0058] FIG. 6 is a perspective view showing a filter body according to a second embodiment of the present invention.

[0059] Referring to the figure, in filter body 31, the method of fixing wire mesh 33 with fixing members 34 is basically the same as in the case of filter body 1 described above, and therefore both ends of wire mesh 33 in the winding direction are inserted into support body 32 through slits 43. However, both ends of wire mesh 33 are covered by pocket members 35 attached around slits 43 inside support body 32, and are not exposed inside support body 32. The detailed structure of pocket members 35 will be described later.

[0060] Next, FIG. 7 is a perspective view showing a support included in the filter body shown in FIG.

[0061] Referring to the figure, a slit 43 is formed in the support 32 so as to cut out a part of the outer circumferential surface and to communicate from one end 41 to the other end 42 in the longitudinal direction of the support 32 .

[0062] Next, FIG. 8 is a perspective view showing a pocket member included in the filter body shown in FIG.

[0063] Referring to the same figure, in the pocket member 35, a pocket member main body 38 having a rectangular cylindrical shape extending in the longitudinal direction has one side circumferential surface 40 cut out in a manner that communicates with the longitudinal direction, thereby forming a secondary slit 39. In other words, cutout ends 46a, 46b in the side circumferential surface 40 of the pocket member main body 38 are spaced apart via the secondary slit 39. In addition, the cutout ends 46a, 46b are tapered in the direction toward each other.

[0064] When attaching the wire mesh 33, both ends of the wire mesh 33 in the winding direction are inserted into the secondary slits 39 of the pocket member 35, thereby storing both ends of the wire mesh 33 inside the pocket member 35. In addition, by attaching lids 44, 45 that engage with both longitudinal ends of the pocket member body 38, exposure of both ends of the wire mesh 33 is prevented even at both longitudinal ends. In other words, when the pocket member 35 is attached to the support body 32, the pocket member 35 defines a space inside the support body 32 for storing both ends of the wire mesh 33 in the winding direction.

[0065] With this configuration, both ends of the wire mesh 33 in the winding direction are covered by the pocket members 35, reducing damage to both ends of the wire mesh 33. Furthermore, even if the wire mesh 33 is broken, it is possible to prevent the broken wire mesh 33 from being mixed into the filtered fluid. Next, Fig. 9 is a perspective view showing a fixing member included in the filter body shown in Fig. 6, and Fig. 10 is a cross-sectional view taken along line XX shown in Fig. 9.

[0066] Referring to these figures, the fixing member 34 is composed of a flat cover portion 47 extending longitudinally along the slit 43, and a columnar insertion portion 48 integrated with one side of the cover portion 47.

[0067] The insertion portion 48 has a bulging portion 51 whose width in the lateral direction gradually increases from a narrowed portion 49 toward the cover portion 47 .

[0068] FIG. 11 is a perspective view showing a cross section taken along line XI-XI shown in FIG.

[0069] Referring to the same figure, as described above, the notched ends 46a, 46b on the side peripheral surface 40 of the pocket member 35 are configured to be tapered, and therefore they engage with the narrowed portion 49 and the bulged portion 51 of the insertion portion 48 of the fixing member 34 inserted into the secondary slit 39. Therefore, the fixing member 34 is fixed to the slit 43 more firmly.

[0070] Furthermore, since the wire mesh 33 is sandwiched between the notched ends 46a, 46b of the pocket member 35 and the insertion portion 48 of the fixing member 34, the wire mesh 33 is fixed to the support body 32 more firmly.

[0071] Next, FIG. 12 is a perspective view showing a filter body according to a third embodiment of the present invention.

[0072] The basic configuration of this filter body 61 is similar to that of the filter body 31 according to the second embodiment, and therefore the following description will focus on the differences.

[0073] Referring to the figure, in filter body 61, one end 71 in the longitudinal direction of support body 62 is provided with a flange 74, and the other end 72 is provided with a bottom plate 75 so as to close other end 72.

[0074] With this configuration, the filtered fluid flows from the other end 72 side to the one end 71 side, which is useful when it is desired to direct the fluid.

[0075] Next, FIG. 13 is a cross-sectional view showing a filtering device using a filter body according to a fourth embodiment of the present invention.

[0076] The basic configuration of this filter body 81 is the same as that of the above-described filter body 61. In the figure, the area below the dashed dotted line drawn on the filter body 81 illustrates the external appearance of the filter body 81, and the area above the dashed dotted line illustrates the internal structure of the filter body 81.

[0077] Referring to the figure, filtration device 80 is installed for the purpose of filtering flowing water through pipes 86a and 86b. As shown by arrow 87a, the flowing water enters filtration device 80 from the right to the left in Figure 13. That is, the side of pipe 86a is the primary side, and the side of pipe 86b is the secondary side.

[0078] The filtration device 80 is mainly composed of a cylindrical housing 88 installed between pipes 86a and 86b, and a filter body 81 housed inside the housing 88. A mounting seat 89 provided on the inner wall of the housing 88 is female-threaded, and a mounting bracket 90 provided at the secondary-side end of the filter body 81 is male-threaded. Therefore, during installation, a handle 91 provided at the secondary-side tip of the filter body 81 is turned and screwed in, thereby achieving a watertight screw engagement, and the filter body 81 is housed inside the housing 88. A gasket 92 is provided between the mounting bracket 90 and the mounting seat 89 to provide an even stronger seal.

[0079] During use, running water enters the housing 88 from the pipe 86a, as shown by arrow 87b, and is filtered as it passes through the wire mesh 83 and support 82 of the filter body 81. Then, as shown by arrow 87c, the water passes through the filter body 81 to the primary side and merges with the pipe 86b.

[0080] When the filtering function of the filtering device 80 deteriorates after continued use, the filter body 81 can be removed from the housing 88, the fixing member 84 can be removed, the wire mesh 83 can be released, and the filter body 81 can be replaced. In this way, the filtering function of the filtering device 80 can be easily restored and the filtering device 80 can be reused.

[0081] A filter body that allows for easy replacement of the filter media in this way is particularly useful in cases where it is difficult to clean and reuse the filter media due to severe clogging or adhesion of dirt, or when the concentration of foreign matter is high and the filter media needs to be replaced frequently.

[0082] Although the filter element according to each embodiment of the present invention has been described as being used in a relatively small housing installed in a pipe, the present invention is not limited to this, and the length, size, and number of filters can be appropriately set depending on the application. For example, the filter element can be used in applications such as cartridge filters, candle filters, and relatively large basket filters, in which multiple filters are installed in one housing.

[0083] In each embodiment of the present invention, the support body is made of metal and has a specific shape, but it may be made of other materials and have other shapes as long as it is hollow and cylindrical. Furthermore, the position, size, and number of through holes in the support body may be changed as appropriate.

[0084] Furthermore, although wire mesh is used as the filter material in each embodiment of the present invention, other types of filter material may also be used. Examples include resin mesh, filter paper, filter cloth, and an etched sheet with holes formed at predetermined intervals in a bendable metal thin film. The size of the pores in the filter material can be set appropriately depending on the application, and may be 1 μm to 1000 μm. Furthermore, multiple filter materials with the same or different pore sizes may be stacked and used.

[0085] Furthermore, in each embodiment of the present invention, the fixing member is made of rubber and has a specific structure, but other materials and structures may be used as long as it can be freely fitted into the slit and can fix both ends of the filter material to the slit. For example, it may be made of resin molded to approximately the same size as the slit. Also, the fixing member may be fixed with a separate member such as a gasket.

[0086] Furthermore, although the insertion section has a tapered section in each embodiment of the present invention, it does not have to have a tapered section. Conversely, a stepped structure may be formed by providing multiple structures similar to the tapered section, and such a configuration allows the wire mesh to be stretched and fixed more firmly.

[0087] Furthermore, in each embodiment of the present invention, gaskets are provided at both longitudinal ends of the support body, but the gaskets may be omitted, or a gasket may be provided at only one end.

[0088] Furthermore, in each embodiment of the present invention, steps or grooves may be provided at both longitudinal ends of the support body. With this configuration, if a gasket is used, the gasket can be fitted into the steps or grooves to prevent it from coming off.

[0089] Furthermore, in each embodiment of the present invention, when attaching a new filter medium to the support, it may be temporarily fixed using a C-shaped ring with an open portion corresponding to the slit in the support, which makes the installation process of inserting both ends of the filter medium in the winding direction into the slit easier.

[0090] Furthermore, in each embodiment of the present invention, a restraining member may be further provided that is wound around the filter medium in the body of the support. In this configuration, the filter medium is pressed against the body of the support by the restraining member, preventing the filter medium from floating. Examples of the restraining member include a wire wound in a spiral shape around the filter medium in the body of the support, or a ring-shaped clamp provided at an appropriate pitch.

[0091] Furthermore, in the second embodiment of the present invention, the notched end portion on the side peripheral surface of the pocket member main body is formed to be tapered, but it may also be formed to be flat.

[0092] Furthermore, in the second embodiment of the present invention, the support body and the pocket member are separate bodies, but they may be integrally formed. [Explanation of symbols]

[0093] 1, 31, 61, 81...Filter body 2, 32, 62, 82...Support 3, 33, 83...wire mesh 4, 34, 84...Fixing members 5...Gasket 8...Support body 9...Torso 10...Through hole 13, 43...Slit 17, 47...Cover 18, 48...insertion part 19, 49...Diaphragm 23...End In addition, the same reference numerals in each drawing indicate the same or corresponding parts.

Claims

1. A filter body having a hollow cylindrical shape and used for filtering a fluid by passing it from the outside to the inside or from the inside to the outside, a support body formed in a hollow cylindrical shape and having a plurality of through holes and slits extending in the longitudinal direction; a filter material formed in a sheet shape and wound around the outer circumferential periphery of the support in a stretched state, with both ends in the winding direction inserted into the slits; a fixing member that is freely fitted into the slit and that inserts both ends of the filter material into the slit and fixes the filter material to the inside of the support, the fixing member includes an insertion portion that is inserted into the slit, The insertion portion has a narrowed portion whose width in the short side direction is narrowed, and a bulged portion whose width in the short side direction is gradually widened outward, The support further includes a pocket member defining a space for accommodating both ends of the filter material in the winding direction, a secondary slit is formed by cutting out a communicating portion in the longitudinal direction of the side circumferential surface of the pocket member, and cutout ends spaced apart by the secondary slit are tapered toward each other; The cutout end engages with the narrowed portion and the bulged portion of the insertion portion.

2. The filter body according to claim 1 , wherein the slit is sealed by the fixing member.

3. The filter body according to claim 1 or 2, further comprising a gasket fitted onto an outer peripheral surface of the support at an end in the longitudinal direction of the support.

4. the fixing member further includes a cover portion whose inner surface is aligned with the outer peripheral surface of the support; The fixing member has a step portion corresponding to the thickness of the cover portion at an end portion in the longitudinal direction on the side of the inserting portion by extending the inserting portion longer than the cover portion in the longitudinal direction, The gasket fits into the step portion, The filter body according to claim 3 , wherein the gasket covers the longitudinal end of the filter medium and a portion of the longitudinal end of the support body that is not wrapped with the filter medium.

5. The filter body according to claim 1 or 2, further comprising a restraining member wound around the filter medium in the body portion of the support.

6. A method for replacing a filter medium in a hollow cylindrical filter body used for filtering a fluid by passing it from the outside to the inside or from the inside to the outside, comprising: The filter body includes a support body formed in a hollow cylindrical shape and having a plurality of through holes and slits extending in the longitudinal direction, a filter material formed in a sheet shape and wound around the outer circumferential periphery of the support body in a stretched state, with both ends in the winding direction inserted into the slits, and a fixing member that can be freely fitted into the slit and inserts both ends of the filter material into the slit and fixes it to the inside of the support body, the fixing member having an insertion portion inserted into the slit, the insertion portion having a tapered portion whose width in the lateral direction narrows and a bulging portion whose width in the lateral direction gradually widens toward the outside, and the support body further includes a pocket member that partitions a space for accommodating both ends of the filter material in the winding direction, and a secondary slit is formed by cutting out a side peripheral surface of the pocket member in a longitudinal direction and communicating with each other, and the cutout ends separated by the secondary slit are tapered in the direction approaching each other, and the cutout ends are configured to mesh with the tapered portion and the bulging portion of the insertion portion, a removing step of removing the fixing member from the slit and removing the filter medium; and a mounting step of mounting a new filter medium on the support.

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