Filter cartridges, pipe fittings with filter cartridges

Abstract

To prevent a filter from sticking and to facilitate replacement of the filter without impairing its function as a filter. [Solution] The filter cartridge has a corrosion-resistant mesh bag made of corrosion-resistant metal or plastic, a ring portion made of corrosion-resistant metal or plastic, and a fastener made of corrosion-resistant metal or plastic that secures the corrosion-resistant mesh bag to the inner surface of the hole in the ring portion.The fastener passes intermittently around the outer surface of the ring portion and secures the bag to the ring portion intermittently all around the periphery of the opening of the bag, with the opening of the corrosion-resistant mesh bag open on the inner surface of the hole in the ring portion, and when viewed in the radial direction of the ring portion, the distance between the part of the fastener located outside the outer surface of the ring portion and the outer surface of the ring portion is less than the dimension of the mesh of the corrosion-resistant mesh.

Description

[Technical Field]

[0001] The present disclosure relates to a filter cartridge and a pipe joint with a filter cartridge. [Background technology]

[0002] Patent Document 1 discloses a configuration in which a filter for capturing solid particles flowing through a pipe is provided at a joint that connects pipes. In the configuration described in Patent Document 1, the filter is detachably attached to the pipe via a cylindrical sleeve. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 7-213823 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the configuration described in Patent Document 1, if the liquid fluid contains viscous particles such as scum, the particles may adhere to the boundary between the pipe and the sleeve. If the adhered particles dry, the sleeve may stick to the pipe when replacing the filter, making it difficult to replace the filter.

[0005] The present invention has been made to solve the above-mentioned problems, and aims to provide a filter cartridge that prevents the filter from sticking and allows for easy filter replacement without impairing its function as a filter, and a filter cartridge-equipped pipe fitting to which the filter cartridge is attached. [Means for solving the problem]

[0006] In order to solve the above problems, the filter cartridge according to the present invention comprises: Metal mesh A bag of gold a metal or plastic annular portion; network The bag is fixed to the inner surface of the hole of the annular portion. gold and a metal or plastic fastener, the fastener passing intermittently through the outer surface of the annular portion and fastening the bag to the annular portion intermittently around the entire periphery of the opening with the opening of the bag open on the inner surface of the hole, and the distance between the part of the fastener positioned outside the outer surface of the annular portion and the outer surface of the annular portion as viewed in the radial direction of the annular portion is network The size of the eye is less than The shape of the bag is any one of a deformed cylinder, a deformed cone, a deformed truncated cone, and a deformed hemisphere, and the bottom of the bag is formed by forming the shape using the metal mesh sheet and then deforming a part of the shape, and the maximum dimension of the bottom of the bag, as viewed in the radial direction of the annular portion, is greater than the minimum inner diameter of the annular portion on which the fastener is disposed and is equal to or less than the diameter of an imaginary circle that includes the fastener located on the outer surface of the annular portion. .

[0007] The filter cartridge-equipped pipe joint to which the filter cartridge is attached is constructed by combining a pair of a convex coupler and a concave coupler. The filter cartridge is inserted into either the convex coupler of a one-touch pipe fitting, the convex coupler of a cam arm pipe fitting, or the convex coupler of a union pipe fitting, to which a nipple, a bushing, and a threaded pipe are fixed. When viewed in the radial direction of the annular portion, the diameter of an imaginary circle extending from the outer surface of the annular portion to the fastener located on the outside is larger than the inner diameter of any of the above-mentioned nipples, bushings, or threaded piping, and is substantially the same as the inner diameter of at least some points of the convex coupler. The maximum dimension of the bottom of the bag may be greater than the inside diameter of any of the nipples, bushings, or threaded tubing mentioned above. [Effects of the Invention]

[0008] The filter cartridge of the present invention has a simple structure consisting of a bag, an annular portion, and a fastener, and can therefore be manufactured inexpensively. Furthermore, in the filter cartridge of the present invention, portions of the fasteners are intermittently arranged around the entire circumference of the annular portion so as to be positioned outside the outer surface of the annular portion. Therefore, when the filter cartridge is attached to the convex coupler of a pipe fitting, the portions of the fasteners of the filter cartridge contact the convex coupler at locations where the inner diameter of the convex coupler and the diameter of the imaginary circle are substantially the same. Because the diameter of the imaginary circle is larger than the inner diameter of the nipple, bushing, or threaded piping attached to the pipe fitting, the filter cartridge will not flow out of the convex coupler even if pressure is applied to the filter cartridge by the flow of fluid. In this regard, it is even more effective to design the maximum dimension of the bottom of the filter cartridge bag to be larger than the inner diameter of the nipple, bushing, or threaded piping. That is, either the annular portion where the fastener is located or the bottom of the bag contacts and catches with the nipple, bushing, and threaded pipe, preventing the filter cartridge from slipping out of the convex coupler. Furthermore, in addition to the catch, as described above, a portion of the fastener contacts the convex coupler, ensuring reliable and stable positioning. Therefore, the filter cartridge of the present invention can fully function as a filter. Even after the positioning is achieved, the part of the fastener provides a gap between the annular portion and the pipe joint, preventing the above-mentioned sticking. Since the sticking can be prevented, the filter cartridge in the pipe joint with a filter cartridge can be easily replaced. In other words, the filter cartridge of the present invention and the filter cartridge-equipped pipe joint to which the filter cartridge is attached can prevent the filter from sticking and facilitate filter replacement without impairing the filter's function. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a side view of a filter cartridge 100A according to a first embodiment. [Figure 2]FIG. 2 is a view of the filter cartridge 100A as seen from one side in the axial direction. [Figure 3] In this example, a filter cartridge 100A is attached to a one-touch pipe joint to form a pipe joint with a filter cartridge 1A. [Figure 4] 4 is an enlarged cross-sectional view of a convex coupler in the filter cartridge-equipped pipe joint 1A of FIG. 3. FIG. [Figure 5] 5 is a view of the filter cartridge 100A inserted into the convex coupler shown in FIG. 4, as viewed from one axial side. FIG. [Figure 6] 1 is a cross-sectional view showing an example in which a filter cartridge 100A is attached to a cam arm pipe joint to form a pipe joint with a filter cartridge 1B. FIG. [Figure 7] In this example, a filter cartridge 100A is attached to a union pipe joint to form a pipe joint with a filter cartridge 1C. [Figure 8] FIG. 10 is a cross-sectional view showing an example in which a filter cartridge 100B of the second embodiment is attached to a one-touch pipe joint to form a pipe joint with a filter cartridge 1A'. [Figure 9] FIG. 10 is a cross-sectional view showing an example in which a filter cartridge 100B is attached to a cam arm pipe joint to form a pipe joint with a filter cartridge 1B'. [Figure 10] FIG. 10 is a cross-sectional view showing an example in which a filter cartridge 100B is attached to a union pipe joint to form a pipe joint with a filter cartridge 1C'. [Figure 11] FIG. 10 is a cross-sectional view showing an example in which a filter cartridge-equipped pipe joint 1A'' is constructed by attaching a filter cartridge 100C of the third embodiment to a one-touch pipe joint. [Figure 12] 10 is a cross-sectional view showing an example in which a convex coupler and a first pipe 81Z in a pipe joint 1A with a filter cartridge to which a filter cartridge 100A of the first embodiment is attached are connected by a bushing 91 instead of a nipple 83. FIG. [Figure 13]10 is a cross-sectional view showing an example in which a convex coupler in a filter cartridge-equipped pipe joint 1A to which a filter cartridge 100A of the first embodiment is attached is directly connected to a first pipe 81Z without using a nipple or a bushing. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, a filter cartridge according to an embodiment and a pipe joint with a filter cartridge to which the filter cartridge is attached will be described with reference to Figures 1 to 13. The embodiment is merely an example, and is not intended to exclude various modifications and technical applications that are not explicitly stated. Except for the configurations essential to the present invention, each configuration of the embodiment can be selected and / or modified as necessary. Here, the filter cartridge will be described as capturing particles contained in a liquid, but the fluid may also be a gas. That is, the filter cartridge and the filter cartridge-equipped pipe fitting can be used to capture particles contained in not only liquids but also gases. When the fluid is a gas, the term "liquid-tight" in the following description can be understood as "airtight." In the following description, "one side" means the right side of the letter "Da" in the figure when viewed from the front, and "the other side" means the left side of the letter "Da" in the figure when viewed from the front.

[0011] First Embodiment (Filter cartridge configuration) 1 and 2, the filter cartridge 100A of the first embodiment includes a ring portion 101A, a bag 102A, a fastener 103, and a puller 105. The filter cartridge 100A has a simple structure with few components, making it easy and inexpensive to manufacture. These components are all made of corrosion-resistant metal or plastic.

[0012] The annular portion 101A is an annular portion having a hole 101h penetrating in the central axis direction Da. In this example, the annular shape is a donut shape formed by cutting a long tube into short pieces. The annular portion 101A is provided at one end of the filter cartridge 100A in the central axis direction Da. Bag 102A has a cylindrical portion 1021 and an expanded diameter portion 1022 formed from a corrosion-resistant net. Cylindrical portion 1021 and expanded diameter portion 1022 are integrally connected to each other. The corrosion-resistant net has many holes throughout its length. The dimension S1 of one side of each square hole is designed to be smaller than the particle size of the particle to be captured so that the desired particle contained in the fluid can be captured. The cylindrical portion 1021 is a cylindrical portion that has an opening 102p formed on one side in the central axis direction Da and has a substantially constant outer diameter over the central axis direction Da. The expanded diameter portion 1022 is formed on the bottom portion 102d on the other side in the central axis direction Da, and is formed to expand in diameter outward in the radial direction Dr relative to the cylindrical portion 1021. The largest diameter portion of the expanded diameter portion 1022 has a dimension larger than the outer diameter of the cylindrical portion 1021, i.e., the maximum dimension D1 of the bottom portion 102d of the bag 102A.

[0013] For example, when a corrosion-resistant mesh made of a corrosion-resistant metal is used, bag 102A can be formed as follows: First, a sheet of corrosion-resistant mesh is rolled up to form a cylinder including tubular portion 1021 and fixed in place. Then, at the end of the cylinder, i.e., the portion that will become bottom portion 102d, the corrosion-resistant mesh is pressed inward in the radial direction Dr relative to tubular portion 1021 to deform it, resulting in the formation of expanded diameter portion 1022 that expands perpendicular to the pressing direction. By deforming it in this way, the mesh size of the corrosion-resistant mesh does not become larger than the original S1 × S1, so the designed filtering function can be obtained.

[0014] Bag 102A is located inward in the radial direction Dr from the outer surface of annular portion 101A facing outward in the radial direction Dr throughout the central axis Da. In other words, maximum dimension D1 of expanded diameter portion 1022 at bottom 102d of bag 102A is smaller than the sum of outer diameter D2 of annular portion 101A and dimension Dk of a convex portion of fastener 103 (i.e., the thickness of linear fastener 103), which will be described later. Furthermore, maximum dimension D1 of expanded diameter portion 1022 is larger than diameter D3 of an imaginary circle that is tangent to the inside of fasteners 103 installed at approximately equal intervals on an inner surface of annular portion 101A facing inward in the radial direction Dr. In other words, maximum dimension D1 of expanded diameter portion 1022 is larger than the minimum inner diameter of annular portion 101A where fastener 103 is disposed. It is desirable to design the thickness of the linear fastener 103 to be smaller than the particle size of the foreign matter to be captured.

[0015] The opening 102p of the bag 102A is inserted into the inside of the annular portion 101A in the radial direction Dr, and is fixed to the inner surface of the annular portion 101A, i.e., around the hole 101h, by a linear fastener 103 with the opening 102p in an open state. For example, if fastener 103 is a single wire made of corrosion-resistant metal, as shown in Figure 2, the corrosion-resistant mesh can be fixed to annular portion 101A by passing the wire through multiple holes in the corrosion-resistant mesh and winding it alternately and intermittently around the inner and outer surfaces of annular portion 101A. Of the fasteners 103 wound around the annular portion 101A, a portion of the fasteners 103 located on the outer surface side of the annular portion 101A forms a convex portion of the fasteners 103 that protrudes outward from the outer surface of the annular portion 101A in the radial direction Dr of the annular portion 101A. Although an example in which fastener 103 is only one wire has been described here, fastener 103 may be made of multiple wires or one or more plastic wires depending on the design.Fastener 103 may also be a linear wire that passes through the outer surface of annular portion 101A and pinches part of the inner surface, like a stapler pin.

[0016] The distance K between fastener 103 and the outer surface of annular portion 101A in the radial direction Dr of annular portion 101A, in other words, the dimension of the protrusion of fastener 103, corresponds to the thickness of linear fastener 103, or the wire diameter if fastener 103 is wire 103w. Distance K is equal to or less than the dimension S1 (see Figure 1) of one side of the corrosion-resistant mesh that forms bag 102A.

[0017] The puller 105 is fixed to the fastener 103 or the annular portion 101. Here, the puller 105 has an annular shape, so that an operator can hook his / her fingers around it and easily pull the filter cartridge 100A.

[0018] (Configuration of pipe fitting with filter cartridge) As shown in Figure 3, the filter cartridge 100A of the first embodiment is attached to a commercially available one-touch pipe fitting, and as a whole constitutes a filter cartridge-equipped pipe fitting 1A. The filter cartridge-equipped pipe fitting 1A includes a convex coupler 11 to which the filter cartridge 100A is attached, and a concave coupler 21. The tubular convex coupler 11 and the tubular concave coupler 21 are fitted together to form a single unit, thereby forming the filter cartridge-equipped pipe fitting 1A, which allows fluid that flows into the concave coupler 21 to flow out of the convex coupler 11. Both the convex coupler 11 and the concave coupler 21 are made of corrosion-resistant metal or plastic.

[0019] FIG. 4 is an enlarged cross-sectional view of the convex coupler 11 of the filter cartridge-equipped pipe joint 1A shown in FIG. 3, with the filter cartridge 100A attached. The convex coupler 11 includes a coupler body 12 and a seal ring 13. The coupler body 12 integrally includes a pipe connection portion 14, an insertion portion 15, a locking protrusion 16, and a seal holding portion 17.

[0020] The pipe connection portion 14 is formed at the other end in the central axis direction Da. The pipe connection portion 14 is formed in a cylindrical shape extending in the central axis direction Da. The pipe connection portion 14 has a female thread portion 14n on the inner circumferential surface of the other end in the central axis direction Da. A first pipe 81 is connected to the pipe connection portion 14 of the coupler body 12. The first pipe 81 is connected to the pipe connection portion 14 via a first nipple 83. The first nipple 83 has male thread portions 83n and 83m on both sides in the central axis direction Da. By screwing the male thread portion 83n of the first nipple 83 into the female thread portion 14n of the pipe connection portion 14, the convex coupler 11 and the first nipple 83 are connected to each other. The first pipe 81 has a female thread portion 81n on the inner peripheral surface of one end portion in the central axis direction Da. The first pipe 81 and the first nipple 83 are connected to each other by screwing a male thread portion 83m on the other side in the central axis direction Da of the first nipple 83 into the female thread portion 81n of the first pipe 81.

[0021] The insertion portion 15 of the coupler body 12 is formed at one end of the coupler body 12 in the central axis direction Da. The insertion portion 15 is formed in a cylindrical shape extending in the central axis direction Da. The insertion portion 15 is inserted into a concave coupler 21, which will be described later. The locking protrusion 16 of the coupler body 12 is formed in the middle of the central axis direction Da of the convex coupler 11. The locking protrusion 16 protrudes outward from the insertion portion 15 in the radial direction Dr. The seal retaining portion 17 of the coupler body 12 is formed between the insertion portion 15 and the locking protrusion 16 in the central axis direction Da. The seal retaining portion 17 is recessed inward in the radial direction Dr relative to the insertion portion 15 and the locking protrusion 16 and has a groove extending circumferentially. The seal ring 13 is made of rubber and has a doughnut shape, so it can be expanded in diameter. Therefore, the seal ring 13 is expanded in diameter, and the seal retaining portion 17 of the convex coupler 11 is inserted into the hole of the seal ring 13. The seal ring 13 is then shifted along the outer wall surface of the seal retaining portion 17, whereby it is fitted into the groove of the seal retaining portion 17. The inner diameter of the groove of the seal retaining portion 17 is smaller than the inner diameter of both the insertion portion 15 and the locking protrusion 16, and is equal to or smaller than the inner diameter of the pipe connection portion 14. The inner circumferential surface of the seal retaining portion 17 is a minimum inner diameter portion 18, which is at least one of the points in the convex coupler 11 with the smallest inner diameter.

[0022] As shown in FIG. 3, the concave coupler 21 of the filter cartridge-equipped pipe joint 1A includes a coupler body 22, a locking member 23, and a biasing member 24. The coupler body 22 integrally includes a pipe connecting portion 26, an inserted portion 27, and a stopper 28.

[0023] The pipe connection portion 26 of the coupler body 22 is formed at one end of the coupler body 22. The pipe connection portion 26 is formed in a cylindrical shape extending in the central axis direction Da. The pipe connection portion 26 is connected to the second pipe 82 via a second nipple 84. The inserted portion 27 of the coupler body 22 is formed at the other end of the coupler body 22. The inserted portion 27 is formed in a cylindrical shape extending in the central axis direction Da. The inserting portion 15 of the convex coupler 11 is inserted into the inside of the inserted portion 27 in the radial direction Dr. The seal ring 13 of the convex coupler 11 is in close contact with the inner circumferential surface of the inserted portion 27, thereby liquid-tightly connecting the convex coupler 11 and the concave coupler 21. The stopper 28 of the concave coupler 21 is formed in the central axial direction Da between the pipe connection portion 26 and the inserted portion 27. The stopper 28 protrudes outward in the radial direction Dr from the outer peripheral surface of the inserted portion 27 and supports the locking member 23, which will be described later.

[0024] The locking member 23 of the concave coupler 21 is provided at the other end of the concave coupler 21. The locking member 23 is provided on the outside in the radial direction Dr relative to the inserted portion 27. The locking member 23 is provided so as to be movable along the central axis direction Da relative to the inserted portion 27. The locking member 23 is biased by a biasing member 24 toward the other side in the central axis direction Da. The locking member 23 is made of metal or plastic and has a plurality of locking claws 233. The plurality of locking claws 233 are formed at intervals in the circumferential direction on the outer side in the radial direction Dr of the inserted portion 27. Each of the plurality of locking claws 233 extends to the other side in the central axis direction Da. The insertion portion 15 of the convex coupler 11 is inserted into the insertion portion 27 of the concave coupler 21, and the multiple locking claws 233 of the locking member 23 are engaged with the locking protrusions 16 of the convex coupler 11, thereby connecting the concave coupler 21 to the convex coupler 11.

[0025] FIG. 5 is a view of the filter cartridge 100A inserted into the convex coupler 11, as viewed from one axial side. 4 and 5, the filter cartridge 100A is inserted into the insertion portion 15 of the convex coupler 11 from the bottom portion 102d of the bag 102A. The convex portion of the fastener 103 located outside the outer surface of the annular portion 101A comes into contact with the minimum inner diameter portion 18 of the convex coupler 11. When viewed in the radial direction Dr, the diameter Dk of an imaginary circle including the convex portion of the fastener 103 is larger than the inner diameter D4 of the first nipple 83. The diameter Dk is substantially the same as the inner diameter D5 of the smallest inner diameter portion 18 of the convex coupler 11.

[0026] After the convex coupler 11 and the concave coupler 21 are integrated, if a fluid is caused to flow from the concave coupler 21 toward the convex coupler 11, the filter cartridge 100A will tend to move in the direction of the fluid flow. However, because the diameter of the expanded diameter portion 1022 at the bottom 102d of the bag 102A is larger than the inner diameter of the first nipple 83, the filter cartridge 100A will not flow out of the convex coupler 11. Furthermore, even when a fluid flow is applied, the annular portion 101A is designed to have dimensions that allow the convex portion of the fastener 103 to continue to contact the minimum inner diameter portion 18 of the convex coupler 11, so the filter cartridge 100A continues to function properly as a filter. Furthermore, by designing the diameter of the linear fastener 103 to be smaller than the particle size of the particles to be captured in the fluid, the multiple protrusions of the fastener 103 that intermittently contact the minimum inner diameter section 18 of the convex coupler 11 can make the gaps between adjacent protrusions function as a filter, similar to a corrosion-resistant mesh. This makes it possible to comprehensively improve the filtering function of the filter cartridge 100A in the filter cartridge-equipped pipe fitting 1A.

[0027] When removing the filter cartridge 100A from the convex coupler 11, an operator hooks their fingers or an appropriate tool on the pulling tool 105 and pulls the filter cartridge 100A to one side in the central axis direction Da. As described above, the multiple protrusions of the fastener 103 intermittently contact the minimum inner diameter portion 18 of the convex coupler 11, and an appropriate gap is formed between the minimum inner diameter portion 18 of the convex coupler 11 and the outer surface of the annular portion 101A. Therefore, the contact area between the filter cartridge 100A and the convex coupler 11 is small, and when the operator pulls the pulling tool 105, the filter cartridge 100A can be easily extracted from the convex coupler 11 without being affected by foreign matter contained in the fluid adhering to the filter cartridge 100A.

[0028] (Example of filter cartridge 100A attached to another pipe joint (cam arm pipe joint)) The filter cartridge 100A can be attached to and used in pipe joints other than the one-touch pipe joint described above. 6 shows an example in which a filter cartridge 100A is attached to a commercially available cam arm pipe joint to form a filter cartridge-equipped pipe joint 1 B. The cam arm pipe joint includes a convex coupler 31 and a concave coupler 41. The convex coupler 31 and the concave coupler 41 are made of corrosion-resistant metal or plastic.

[0029] The convex coupler 31 integrally includes a pipe connection portion 32, an insertion portion 33, and a locking recess . The pipe connection portion 32 is formed at the end portion of the convex coupler 31 on the other side in the central axis direction Da (the left side when looking at the letter "Da" in the figure from the front). The pipe connection portion 32 is formed in a cylindrical shape extending in the central axis direction Da. The pipe connection portion 32 has a female thread portion 32n on the inner circumferential surface of the end portion on the other side in the central axis direction Da. A first pipe 81 is connected to the pipe connection portion 32 via a first nipple 83 that screws into the female thread portion 32n. The insertion portion 33 is formed at one end of the convex coupler 31 in the central axis direction Da. The insertion portion 33 is formed in a cylindrical shape extending in the central axis direction Da. The insertion portion 33 is inserted into a concave coupler 41, which will be described later. The inner diameter D5 of the insertion portion 33 is the same as or smaller than the inner diameter of the pipe connection portion 32. The inner circumferential surface of the insertion portion 33 forms a minimum inner diameter portion 38, which is the smallest inner diameter in the convex coupler 31. The locking recess 34 is formed in the middle of the central axis direction Da of the convex coupler 31. The locking recess 34 is recessed inward in the radial direction Dr from the outer circumferential surface of the insertion portion 33 and is formed in a groove shape that extends around the entire circumferential direction of the convex coupler 31.

[0030] The concave coupler 41 includes a coupler body 42 and a cam arm 43 . The coupler body 42 integrally includes a pipe connecting portion 46 and an inserted portion 47 . The pipe connection part 46 is formed at one end of the coupler body 42 in the central axis direction Da. The pipe connection part 46 is formed in a cylindrical shape extending in the central axis direction Da. The second pipe 82 is connected to the pipe connection part 46 via a second nipple 84 that is screwed into the inner circumferential surface of the one end of the pipe connection part 46 in the central axis direction Da. The inserted portion 47 is formed at the end of the coupler body 42 on the other side in the central axis direction Da. The inserted portion 47 is formed in a cylindrical shape extending in the central axis direction Da. The inserting portion 33 of the convex coupler 31 is inserted into the radially inner side of the inserted portion 47 in the radial direction Dr. The inner diameter of the inserted portion 47 is larger than the inner diameter of the pipe connection portion 46, and a stepped surface 48 facing the other side in the central axis direction Da is formed at the boundary between the inserted portion 47 and the pipe connection portion 46. A seal ring 44 is provided on the stepped surface 48. The seal ring 44 is sandwiched between the tip end of the convex coupler 31 and the stepped surface 48, thereby liquid-tightly connecting the convex coupler 31 and the coupler body 42 of the concave coupler 41.

[0031] A plurality of cam arms 43 are provided at intervals in the circumferential direction of the coupler body 42. A cam portion 431 having a predetermined cam shape is formed at one end of the cam arm 43. The cam arm 43 is supported by the coupler body 42 so as to be able to swing. The cam portion 431 appears and disappears within the inserted portion 47 by swinging the cam arm 43. With the insertion portion 33 of the convex coupler 31 inserted into the inserted portion 47, the cam arm 43 is swung to cause the cam portion 431 to protrude inward in the radial direction Dr of the inserted portion 47, whereby the cam portion 431 engages with the locking recess 34 of the convex coupler 31. This connects the convex coupler 31 and the concave coupler 41.

[0032] The filter cartridge 100A is inserted into the convex coupler 31 of the cam arm pipe joint. The filter cartridge 100A is attached to the convex coupler 31 with the annular portion 101A inserted into the insertion portion 33, which is the smallest inner diameter portion 38 of the convex coupler 31. The filter cartridge 100A is attached to the convex coupler 31 with the bag 102A disposed on the other side of the annular portion 101A in the central axis direction Da.

[0033] In the filter cartridge 100A, when viewed in the radial direction Dr of the annular portion 101A, the diameter Dk of an imaginary circle extending from the outer surface of the annular portion 101A to the fastener 103 located on the outside is larger than the inner diameter D4 of the first nipple 83 and is substantially the same as the inner diameter D5 of the smallest inner diameter portion 38 of the convex coupler 31. Furthermore, the maximum dimension D1 of the bottom portion 102d of the bag 102A is larger than the inner diameter D4 of the first nipple 83.

[0034] After the convex coupler 31 and the concave coupler 41 are integrated, if a fluid is caused to flow from the concave coupler 41 toward the convex coupler 31, the filter cartridge 100A will tend to move in the direction of the fluid flow. However, because the diameter of the expanded diameter portion 1022 at the bottom 102d of the bag 102A is larger than the inner diameter of the first nipple 83, the filter cartridge 100A will not flow out of the convex coupler 31. Furthermore, even when a fluid flow is applied, the annular portion 101A is designed to have dimensions that allow the convex portion of the fastener 103 to continue to contact the minimum inner diameter portion 38 of the convex coupler 31, so the filter cartridge 100A continues to function properly as a filter. Furthermore, by designing the diameter of the linear fastener 103 to be smaller than the particle size of the particles to be captured in the fluid, the multiple protrusions of the fastener 103 that intermittently contact the minimum inner diameter portion 38 of the convex coupler 31 can make the gaps between adjacent protrusions function as a filter, similar to a corrosion-resistant mesh. This makes it possible to comprehensively improve the filtering function of the filter cartridge 100A in the filter cartridge-equipped pipe fitting 1B.

[0035] When removing the filter cartridge 100A from the convex coupler 31, an operator places their fingers on the puller 105 and pulls the filter cartridge 100A to one side in the central axis direction Da. As described above, the convex portion of the fastener 103 intermittently contacts the minimum inner diameter portion 38 of the convex coupler 31, and an appropriate gap is formed between the minimum inner diameter portion 38 of the convex coupler 31 and the outer surface of the annular portion 101A. Therefore, the contact area between the filter cartridge 100A and the convex coupler 31 is small, and when the operator pulls the puller 105, the filter cartridge 100A can be easily extracted from the convex coupler 31 without being affected by stuck particles to be captured.

[0036] As described above, in the filter cartridge equipped pipe joint 1B, as in the filter cartridge equipped pipe joint 1A, the attached filter cartridge 100A improves the filter function and also makes it easy to replace the filter.

[0037] (Example of filter cartridge 100A attached to another pipe joint (union pipe joint)) 7 shows an example in which a filter cartridge 100A is attached to a commercially available union pipe joint to form a filter cartridge-equipped pipe joint 1 C. The union pipe joint includes a convex coupler 51 and a concave coupler 61. Both the convex coupler 51 and the concave coupler 61 are made of corrosion-resistant metal or plastic.

[0038] The convex coupler 51 has a female thread portion 52n on its inner circumferential surface. A first pipe 81 is connected to the convex coupler 51 via a first nipple 83 that screws into the female thread portion 52n. A male thread portion 53 that corresponds to the female thread portion 63n of the concave coupler 61 (described later) is formed on the outer circumferential surface of the convex coupler 51. The concave coupler 61 includes a coupler body 62 and a lock ring 63 . The coupler body 62 is formed in a cylindrical shape extending in the central axis direction Da. A second pipe 82 is connected to one end of the coupler body 62 in the central axis direction Da via a second nipple 84. The lock ring 63 is provided on the outer side of the coupler body 62 in the radial direction Dr. The lock ring 63 is formed in a cylindrical shape extending in the central axis direction Da. The convex coupler 51 is inserted inside the lock ring 63 in the radial direction Dr. A female thread portion 63n that meshes with the male thread portion 53 is formed on the inner circumferential surface of the lock ring 63. A seal ring 64 is provided on the radially inner side of the lock ring 63. The seal ring 64 is sandwiched between the tip of the convex coupler 51 and the coupler body 62, thereby liquid-tightly connecting the convex coupler 51 and the concave coupler 61.

[0039] In the union pipe fitting, the convex coupler 51 is inserted into the lock ring 63 of the concave coupler 61, and the female thread portion 63n of the lock ring 63 is screwed into the male thread portion 53, thereby liquid-tightly connecting the convex coupler 51 and the concave coupler 61.

[0040] The filter cartridge 100A is attached to the convex coupler 51 with the bag 102A disposed on the other side of the annular portion 101A in the central axis direction Da. When viewed in the radial direction Dr of the annular portion 101A, the diameter Dk of an imaginary circle including the outer surface of the annular portion 101A to the fastener 103 located on the outside is larger than the inner diameter D4 of the first nipple 83 and is substantially the same as the inner diameter D5 of the convex coupler 51. In addition, in the filter cartridge 100A, the maximum dimension D1 of the bottom portion 102d of the bag 102A is larger than the inner diameter D4 of the first nipple 83.

[0041] After the convex coupler 51 and the concave coupler 61 are integrated, if a fluid is caused to flow from the concave coupler 61 toward the convex coupler 51, the filter cartridge 100A will tend to move in the direction of the fluid flow. However, because the diameter of the expanded diameter portion 1022 at the bottom 102d of the bag 102A is larger than the inner diameter of the first nipple 83, the filter cartridge 100A will not flow out of the convex coupler 51. Furthermore, even when a fluid flow is applied, the annular portion 101A is designed to have dimensions that allow the convex portion of the fastener 103 to continue to contact the minimum inner diameter portion 58 of the convex coupler 51, so the filter cartridge 100A continues to function properly as a filter. Furthermore, by designing the diameter of the linear fastener 103 to be smaller than the particle size of the particles to be captured in the fluid, the multiple protrusions of the fastener 103 that intermittently contact the minimum inner diameter section 58 of the convex coupler 51 can make the gaps between adjacent protrusions function as a filter, similar to a corrosion-resistant mesh. This makes it possible to comprehensively improve the filtering function of the filter cartridge 100A in the filter cartridge-equipped pipe fitting 1C.

[0042] When removing the filter cartridge 100A from the convex coupler 51, an operator places their fingers on the puller 105 and pulls the filter cartridge 100A to one side in the central axis direction Da. As described above, the convex portion of the fastener 103 intermittently contacts the minimum inner diameter portion 58 of the convex coupler 51, and an appropriate gap is formed between the minimum inner diameter portion 58 of the convex coupler 51 and the outer surface of the annular portion 101A. Therefore, the contact area between the filter cartridge 100A and the convex coupler 51 is small, and when an operator pulls the pulling tool 105, the filter cartridge 100A can be easily pulled out from the convex coupler 51 without being affected by foreign matter contained in the fluid adhering thereto.

[0043] As described above, in the filter cartridge equipped pipe joint 1C, as in the filter cartridge equipped pipe joint 1A, the attached filter cartridge 100A improves the filter function and also makes it easy to replace the filter.

[0044] Second Embodiment Next, a filter cartridge 100B according to a second embodiment will be described. The filter cartridge 100B includes a circular ring portion 101B, a bag 102B, a fastener 103, and a puller 105. As with the filter cartridge 100A according to the first embodiment, the filter cartridge 100B has a simple structure with few components, making it easy and inexpensive to manufacture. These components are all made of corrosion-resistant metal or plastic. FIG. 8 shows an example in which a filter cartridge 100B of the second embodiment is attached to a commercially available one-touch pipe joint, thereby constituting a pipe joint with a filter cartridge 1A' as a whole. The filter cartridge 100B differs from the filter cartridge 100A in that (1) the length of the annular portion 101B is longer than that of the annular portion 101A and performs the same function as the enlarged diameter portion 1022 in the filter cartridge 100A, and (2) the dimensions of the bag 102B are designed so that the entire bag 102B does not come into contact with the inner wall of the first nipple 83. Therefore, in the following description, the annular portion 101B and the bag 102B will be mainly described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

[0045] The length T2 of the annular portion 101B is designed to be a dimension such that the convex portion of the fastener 103 at one end of the annular portion 101B comes into contact with the minimum inner diameter portion 18 of the convex coupler 11, and the other end 101k of the annular portion 101B is caught on the first nipple 83. Therefore, the outer diameter of the annular portion 101B is larger than the inner diameter of the first nipple 83.

[0046] The bag 102B is formed in a bag-like cylindrical shape with a constant outer diameter along the central axis direction Da. The outer diameter of the bag 102B is smaller than the inner diameter D4 of the first nipple 83. Bags 102B of this shape are commercially available and can be obtained at low cost.

[0047] After the convex coupler 11 and the concave coupler 21 are integrated, if a fluid is caused to flow from the concave coupler 21 toward the convex coupler 11, the filter cartridge 100B will attempt to move in the direction of the fluid flow. However, because the diameter of the annular portion 101B is larger than the inner diameter of the first nipple 83, the filter cartridge 100B will not flow out of the convex coupler 11. Furthermore, even when a fluid flow is applied, the annular portion 101B is designed to have dimensions that allow the convex portion of the fastener 103 to continue to contact the minimum inner diameter portion 18 of the convex coupler 11, so the filter cartridge 100B continues to function properly as a filter. Furthermore, by designing the diameter of the linear fastener 103 to be smaller than the particle size of the particles to be captured in the fluid, the multiple protrusions of the fastener 103 that intermittently contact the minimum inner diameter portion 18 of the convex coupler 11 can make the gaps between adjacent protrusions function as a filter, similar to a corrosion-resistant mesh. This makes it possible to comprehensively improve the filtering function of the filter cartridge 100B within the filter cartridge-equipped pipe fitting.

[0048] When removing the filter cartridge 100B from the convex coupler 11, an operator hooks their fingers or an appropriate tool on the pulling tool 105 and pulls the filter cartridge 100B to one side in the central axis direction Da. As described above, the convex portion of the fastener 103 intermittently contacts the minimum inner diameter portion 18 of the convex coupler 11, and an appropriate gap is formed between the minimum inner diameter portion 18 of the convex coupler 11 and the outer surface of the annular portion 101B. Therefore, the contact area between the filter cartridge 100B and the convex coupler 11 is small, and when the operator pulls the pulling tool 105, the filter cartridge 100B can be easily extracted from the convex coupler 11 without being affected by adhesion of target particles contained in the fluid.

[0049] (An example of attaching the filter cartridge 100B to another pipe joint) FIG. 9 shows an example in which a filter cartridge 100B is attached to the cam arm pipe joint of FIG. 6 to form a pipe joint with a filter cartridge 1B'. FIG. 10 shows an example in which a filter cartridge 100B is attached to the union pipe joint of FIG. 7 to form a pipe joint with a filter cartridge 1C'. As mentioned above, filter cartridge 100B is characterized by the fact that annular portion 101B is long and performs the same function as enlarged diameter portion 1022 in filter cartridge 100A, and that the entire bag 102B is designed to have dimensions that do not contact the inner wall of first nipple 83. Therefore, in either of the filter cartridge equipped pipe joints shown in Figs. 9 and 10, the same effects as those of the filter cartridge equipped pipe joint 1A having the filter cartridge 100B attached thereto can be achieved.

[0050] Third Embodiment Next, a filter cartridge 100C of a third embodiment will be described. The filter cartridge 100C is identical to the filter cartridge 100B of the second embodiment except for the shape of the bag. Figure 11 shows an example in which the filter cartridge 100C of the third embodiment is attached to a commercially available one-touch pipe fitting to form a filter cartridge-equipped pipe fitting 1A" as a whole, but here only the shape of the bag 102C of the filter cartridge 100C will be described. The effects of the filter cartridge-equipped pipe fitting 1A" equipped with the filter cartridge 100C are similar to those of the filter cartridge-equipped pipe fitting 1A equipped with the filter cartridge 100B, and therefore will not be described here.

[0051] The bag 102C has a conical shape whose diameter gradually decreases from one side to the other side in the central axis direction Da. Since the corrosion-resistant mesh 104 forming the bag 102C is positioned at an angle to the direction of the fluid flowing from one side to the other in the central axis direction Da, the area of ​​the corrosion-resistant mesh in that direction becomes smaller, making it easier to capture foreign matter contained in the fluid.

[0052] Here, an example has been shown in which the filter cartridge 100C of the third embodiment is attached to a commercially available one-touch pipe joint to form a pipe joint with a filter cartridge 1A'' as a whole. However, like the filter cartridge 100B of the second embodiment, the filter cartridge 100C can also be attached to a commercially available cam arm pipe joint to form a pipe joint with a filter cartridge, or to a commercially available union pipe joint to form a pipe joint with a filter cartridge. In these cases, the same effects as those of the filter cartridge-equipped pipe joint 1A' to which the filter cartridge 100B is attached can be achieved.

[0053] The above describes several embodiments of the filter cartridge of the present invention and several filter cartridge-equipped pipe joints to which the filter cartridges are attached. However, the filter cartridge of the present invention is not limited to the above-described embodiments. The shape of the filter cartridge bag is a modified cylinder in the first embodiment, a cylindrical shape in the second embodiment, and a conical shape in the third embodiment. However, the shape of the filter cartridge bag may be either a truncated cone or a hemispherical shape as long as it has the characteristics of the filter cartridge bag described in the third embodiment, or a modified cone, a modified truncated cone, or a modified hemispherical shape as long as it has the characteristics of the filter cartridge bag described in the first embodiment.

[0054] In addition, in each of the above-described embodiments, the first pipe 81 and the convex coupler are connected via the first nipple 83, but this is not limited to this. For example, as shown in Fig. 12, the first pipe 81 may be replaced with a first pipe 81Z having a thread 81m on its outer surface, and the first nipple 83 may be replaced with a commercially available bushing 91, and the first pipe 81Z and the convex coupler may be connected via the bushing 91. Furthermore, as shown in Figure 13, the first pipe 81 may be replaced with a first pipe 81Z, and the screw 81m may be screwed into the female thread portion 14n of the convex coupler 11, thereby connecting the first pipe 81Z directly to the convex coupler 11 without using a nipple or bushing. Similarly, the connection between the second pipe 82 and the concave coupler is not limited to being via the second nipple 84, but may be via a bushing, or the second pipe 82 may be connected directly without using a nipple or bushing. [Explanation of symbols]

[0055] 1A~1C, 1A'~1C', 1A''...Pipe fitting with filter cartridge 11, 31, 51...Convex coupler 12...Coupler body 13...Seal ring 14...Pipe connection 14n...female thread 15...insertion section 16...Latching protrusion 17...Seal retaining part 18, 38, 58...Minimum inner diameter 21, 41, 61...Concave coupler 22...Coupler body 23... Locking member 24... Urging member 26...Pipe connection 27...inserted part 28...Stopper 32...Pipe connection 32n...female thread 33...insertion part 34...Latching recess 42...Coupler body 43...Cam arm 44, 64...Seal ring 46...Pipe connection 47...inserted part 48…Step surface 52n...female thread 53...Male thread 62...Coupler body 63...Lock ring 63n...Female thread 81, 81Z…First piping (piping) 81m...Screw 81n...Female thread 82…Second piping 83...First nipple (nipple) 83m, 83n...Male thread part 84...Second nipple 91...Bushing 100A~100C...Filter cartridge 101A, 101B...Annular part 101h…hole 101k...end 102A~102C…Bag 102d…Bottom 102p…Aperture 103... Clasp 105...Harness 233...Latching claw 431...Cam section 1021...Cylindrical part 1022...Expanded diameter part

Claims

1. A metal mesh bag; a metal or plastic annular portion; a metal or plastic fastener for fixing the mesh bag to the inner surface of the hole in the annular portion; the fastener passes intermittently through the outer surface of the annular portion with the opening of the bag open on the inner surface of the hole, and fastens the bag to the annular portion intermittently around the entire periphery of the opening, When viewed in the radial direction of the annular portion, a distance between a part of the fastener positioned outward from the outer surface of the annular portion and the outer surface of the annular portion is equal to or less than a dimension of the mesh; the shape of the bag is any one of a deformed cylinder, a deformed cone, a deformed truncated cone, and a deformed hemisphere; the bottom of the bag is formed by forming the shape using the metal mesh sheet and then pressing and deforming a part of the shape; The filter cartridge has a bottom portion whose maximum dimension, as viewed in the radial direction of the annular portion, is greater than the minimum inner diameter of the annular portion on which the fastener is disposed and is equal to or less than the diameter of an imaginary circle that includes the outer surface of the annular portion and the fastener located on the outside.

2. 2. The filter cartridge according to claim 1, wherein the fastener is a wire made of a plastically deformable metal, and the mesh is fixed to the annular portion by passing the wire through the mesh and winding it alternately around the inner and outer surfaces of the annular portion.

3. A filter cartridge as described in claim 2, further having a puller formed of metal or plastic and fixed to the mesh or the annular portion.

4. The filter cartridge according to any one of claims 1 to 3 is inserted into the convex coupler of a one-touch pipe joint, the convex coupler of a cam arm pipe joint, or the convex coupler of a union pipe joint, which is configured by combining a pair of convex and concave couplers to which a nipple, a bushing, or a threaded pipe is fixed, A pipe fitting with a filter cartridge, wherein the diameter of an imaginary circle extending from the outer surface of the annular portion to the fastener located on the outside, viewed in the radial direction of the annular portion, is larger than the inner diameter of either the nipple, the bushing, or the threaded pipe, and is substantially the same as the inner diameter of at least a portion of the convex coupler.

5. The filter cartridge according to any one of claims 1 to 3 is inserted into the convex coupler of a one-touch pipe joint, the convex coupler of a cam arm pipe joint, or the convex coupler of a union pipe joint, which is configured by combining a pair of convex and concave couplers to which a nipple, a bushing, or a threaded pipe is fixed, the maximum dimension of the bottom of the bag is greater than the inner diameter of any of the nipple, the bushing, or the piping; A pipe fitting with a filter cartridge, wherein the diameter of an imaginary circle extending from the outer surface of the annular portion to the fastener located on the outside, as viewed in the radial direction of the annular portion, is substantially the same as the inner diameter of at least a portion of the convex coupler.

6. A filter cartridge comprising a metal or plastic mesh bag, a metal or plastic annular portion, and a metal or plastic fastener for fixing the mesh bag to the inner surface of a hole in the annular portion, wherein the fastener passes intermittently around the outer surface of the annular portion and fixes the mesh bag to the annular portion all around the periphery of the opening when the opening of the bag is open to the inner surface of the hole, and the distance between the outer surface of the annular portion and a part of the fastener located outside the outer surface of the annular portion when viewed in the radial direction of the annular portion is equal to or less than the size of the mesh holes, and the shape of the bag is any one of cylindrical, conical, truncated conical, hemispherical, a deformed cylinder, a deformed cone, a deformed truncated cone, and a deformed hemisphere; The filter cartridge is inserted into one of the convex couplers of a one-touch pipe joint, the convex coupler of a cam arm pipe joint, or the convex coupler of a union pipe joint, which are configured by combining a pair of convex and concave couplers to which a nipple, a bushing, or a threaded pipe is fixed, A pipe fitting with a filter cartridge, wherein the diameter of an imaginary circle extending from the outer surface of the annular portion to the fastener located on the outside, viewed in the radial direction of the annular portion, is larger than the inner diameter of either the nipple, the bushing, or the threaded pipe, and is substantially the same as the inner diameter of at least a portion of the convex coupler.

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