JP2010279886A - Strainer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a strainer capable of effectively removing foreign matter in a fluid. <P>SOLUTION: In the strainer 11 including a housing 12 which is equipped with a mounting opening 20 in a flow passage 15 connecting to an inflow port 13 and an outflow port 14 and which is equipped with a cap 21 detachably mounted in the mounting opening 20, and collecting foreign matter B in the fluid flowing in the flow passage 15 through a screen 22 detachably equipped at the mounting opening 20 in the flow passage 15, a cover member 23 made of a non-magnetic body closes an opening of the mounting opening 20 side of the screen 22 and seals the mounting opening 20 in the housing 12. A cylindrical permanent magnet 25 is arranged in a magnet housing chamber formed between the cover member 23 and the cap 21, and foreign matter A having magnetism such as minute metal pieces in the fluid are adhered to the cover member 23 by the magnetic force generated in the end surface side facing the inflow port 13 side of the permanent magnet 25. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a strainer device that collects foreign matters in a fluid that flows in a fluid pipeline, and more particularly, to a strainer device that incorporates a permanent magnet that can remove magnetic foreign matters such as fine metal pieces in the fluid. .

  For example, a fluid such as steam or compressed air flowing in a fluid pipe line contains a lot of solid foreign matters such as dust, and these foreign matters are caught in the valve seat of the pressure control valve or the direction control valve. It may be sandwiched between the gaps of the sliding parts, causing malfunction of the control valve and other fluid devices. Therefore, a strainer device for filtering foreign matter in a fluid flowing in the fluid piping path is provided in the fluid piping path such as a steam pipe. The strainer device includes a cylindrical screen that is detachably mounted in a flow path that communicates the inflow port and the outflow port. When the fluid passes through the screen, the foreign matter in the fluid passes through the screen mesh. It is supposed to be collected.

  However, the fluid flowing in the fluid pipe line contains a large amount of magnetic foreign objects such as fine metal pieces and wear pieces that peel off from the inner wall of the metal pipe material and fluid equipment. The foreign matter passes through the mesh of the screen and is stacked on the clearance or sliding portion of the fluid device, thereby affecting the operation of the fluid device. In order to remove the minute foreign matter having magnetism, it may be possible to attach a screen having a fine mesh that can collect fine metal pieces and wear pieces to the strainer device. It is easy to clog, and the frequency of maintenance increases.

  Therefore, for example, as described in Patent Document 1, there is a strainer device with a built-in permanent magnet that attracts magnetic foreign matter such as a minute metal piece in a fluid by the magnetic force of the permanent magnet. This permanent magnet is arranged inside the cylindrical screen, and it is possible to attach and detach the permanent magnet from the mounting opening for attaching and detaching the screen, so that the existing strainer device can be added without increasing the size of the strainer device. A permanent magnet can be attached. Further, Patent Document 2 discloses a strainer device in which a permanent magnet is covered with a non-magnetic cover member so that the permanent magnet is shielded from a fluid and the permanent magnet is prevented from corroding due to contact with the fluid. Is described.

Japanese Utility Model Publication No. 60-168556 JP-A-8-117517

  By the way, in the strainer device described in Patent Document 1, the permanent magnet is formed in the shape of an elongated rod, and the permanent magnet is disposed so as to protrude into the flow path so as to face almost the entire axial direction of the screen. . Further, in the strainer device described in Patent Document 2, the cover member is arranged to protrude into the flow path so as to face almost the entire axial direction of the screen, and the permanent magnet is attached in the cover member. Yes. Thereby, in the central part of the flow path where the flow velocity of the fluid is relatively large, the minute foreign matter having magnetism in the fluid is attached to the outer surface of the permanent magnet or the cover member. For this reason, there is a possibility that the foreign matter in the fluid cannot be removed efficiently because the magnetic foreign matter attached to the outer surface of the permanent magnet or the cover member is peeled off again by the fluid.

  In addition, when a permanent magnet or a cover member is disposed so as to protrude into the flow path, the flow path inside the screen is substantially narrowed and resistance to fluid flowing into the screen is increased. The energy loss of the flowing fluid will increase. Furthermore, since the permanent magnet is formed in the shape of a long and narrow bar, it is difficult to use a commercial product for the permanent magnet, and the manufacturing cost of the strainer device is increased.

  An object of the present invention is to efficiently remove foreign substances in a fluid.

  Another object of the present invention is to reduce manufacturing costs.

  The strainer device of the present invention includes an inflow port to which a fluid is supplied and an outflow port through which the fluid flows out, a housing in which a mounting port is formed in a flow path that connects the inflow port and the outflow port, and the mounting A cap that is detachably attached to the opening, is formed in a cylindrical shape that opens to the inflow port side and the attachment port side, and is detachably mounted in the flow path from the attachment port. A screen that collects foreign matter in the fluid; a cover member that is formed of a non-magnetic material and closes the opening on the mounting port side of the screen; and the attachment port that is blocked from the fluid by the cover member And a magnet for adhering foreign matter having magnetism in the fluid to the cover member by a magnetic force generated on an end face side facing the inflow port side. That.

  The strainer device according to the present invention is characterized in that the mounting opening is sealed between the cover member and the housing, and the magnet is disposed between the cover member and the cap.

  The strainer device according to the present invention is characterized in that the mounting opening is sealed between the cap and the housing, and the magnet is covered with the cover member.

  The strainer device according to the present invention is characterized in that the attachment port is sealed between the cap and the housing formed integrally with the cover member, and the magnet is arranged in the cap.

  The strainer device of the present invention is characterized in that the magnet is formed in a cylindrical shape or a disk shape.

  According to the present invention, the magnetic foreign matter in the fluid pushed to the attachment port side by the flow of the fluid flowing into the screen from the inflow port side is opposed to the inflow port side of the magnet disposed in the attachment port. Since it is made to adhere to the outer surface of the cover member by the magnetic force generated on the end face side, the magnet and the cover member are formed in a rod shape, and the magnetic foreign matter in the fluid is removed without projecting into the flow path. Is possible. As a result, the magnetic foreign matter adheres to the outer surface of the cover member in the vicinity of the inner wall of the flow path where the fluid flow rate is relatively small. Therefore, the magnetic foreign matter attached to the cover member is peeled off again by the fluid. This prevents the foreign matter in the fluid from being removed efficiently. In addition, the flow path inside the screen is substantially wider and the resistance to the fluid flowing into the screen is smaller than when a magnet or cover member is protruded into the flow path. The energy loss of the fluid flowing through the fluid can be reduced, and the driving efficiency of the fluid device can be improved. Furthermore, since the magnet has a cylindrical shape or a disk shape, it is possible to use a commercially available magnet, and it is not necessary to form the cover member in a rod shape, which facilitates the molding of the cover member, and the production cost of the strainer device. Can be reduced.

It is sectional drawing which shows the strainer apparatus of 1st embodiment of this invention. It is sectional drawing which expands and shows a part of strainer apparatus of FIG. It is sectional drawing which decomposes | disassembles and shows the strainer apparatus of FIG. It is sectional drawing which shows the strainer apparatus of 2nd embodiment of this invention. It is sectional drawing which expands and shows a part of strainer apparatus of FIG. It is sectional drawing which decomposes | disassembles and shows the strainer apparatus of FIG. It is sectional drawing which shows the strainer apparatus of 3rd embodiment of this invention. It is sectional drawing which expands and shows a part of strainer apparatus of FIG. It is sectional drawing which decomposes | disassembles and shows the strainer apparatus of FIG. It is sectional drawing which expands and shows a partial modification of the strainer apparatus shown in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The strainer device 11 is provided in a fluid piping path and is used to remove solid foreign matters such as dust and fine metal pieces contained in a fluid such as steam and compressed air flowing in the fluid piping path. As shown in FIG. 1, the strainer device 11 has a housing 12 that constitutes a part of the fluid piping. The housing 12 includes an inflow port 13 connected to the upstream side to which a fluid is supplied, and an outflow port 14 connected to the downstream side through which the fluid flows out. The inflow port 13 and the outflow port 14 communicate with each other. The screen accommodating chamber 16 is formed in a substantially Y-shape in the flow path 15. That is, the strainer device 11 is a so-called Y-type strainer. The inflow port 13 and the outflow port 14 are formed substantially coaxially, and the inflow port 13 and the outflow port 14 are internally threaded for pipe connection.

  As shown in FIG. 3, the housing 12 is provided with a partition wall 18 having a circular communication hole 17 that communicates the screen storage chamber 16 and the inflow port 13 side. The communication hole 17 has a stepped hole shape having a small-diameter portion 17 a on the inflow port 13 side and a large-diameter portion 17 b on the screen accommodating chamber 16 side due to the step portion 18 a of the partition wall 18. Accordingly, the screen storage chamber 16 and the inflow port 13 side communicate with each other in a direction inclined with respect to an axis connecting the inflow port 13 and the outflow port 14. On the other hand, the screen storage chamber 16 and the outflow port 14 side communicate with each other in a direction substantially orthogonal to the communication direction between the screen storage chamber 16 and the inflow port 13 side. As a result, a flow path 15 in which fluid can flow from the inflow port 13 through the screen storage chamber 16 to the outflow port 14 is formed in the housing 12 by bending.

  In addition, the housing 12 is formed with a circular mounting opening 20 that opens to the side facing the communication hole 17 in the screen storage chamber 16. The mounting port 20 is formed in the flow path 15 so as to be substantially coaxial with the communication hole 17, and the screen storage chamber 16 communicates with the outside of the housing 12 through the mounting port 20. The mounting opening 20 has a stepped hole shape having a small diameter portion 20 a on the screen storage chamber 16 side and a large diameter portion 20 b on the opening side by a step portion 12 a provided in the housing 12. A female screw for cap attachment is cut in the large diameter portion 20 b of the attachment port 20, the cap 21 is detachably attached to the large diameter portion 20 b of the attachment port 20, and the attachment port 20 is closed by the cap 21. It is like that. The cap 21 is formed with a circular accommodation groove 21 a that opens to the screen accommodation chamber 16 side.

  A screen 22 for collecting foreign substances in the fluid is detachably mounted in the screen storage chamber 16 from the attachment port 20. The screen 22 is formed in a cylindrical shape that opens to the inflow port 13 side and the attachment port 20 side and has a side wall facing the outflow port 14 side, by a metal net made of non-magnetic material such as stainless steel having countless fine meshes. ing. The opening end of the screen 22 on the inflow port 13 side is inserted into the large diameter portion 17 b of the communication hole 17 and abuts against the stepped portion 18 a of the partition wall 18. On the other hand, as shown in FIG. 2, the opening end of the screen 22 on the mounting port 20 side is inserted into the small diameter portion 20a of the mounting port 20, and the cover member 23 abuts against the opening end of the screen 22 on the mounting port 20 side. It has been. That is, the screen 22 is disposed from the attachment port 20 into the flow path 15 and is fixed between the partition wall 18 and the cover member 23. The screen 22 may be a non-magnetic metal plate made of stainless steel or the like and a porous metal plate having numerous small holes or a resin fiber formed in a cylindrical shape.

  The cover member 23 is made of a non-magnetic material such as stainless steel, and has a bottomed cylindrical cover portion 23b in which a storage chamber 23a that opens on the cap 21 side is formed, and a radially outer side from the opening end of the cover portion 23b. And a to-be-held portion 23c extending in the direction. In this cover member 23, the covering portion 23 b protrudes into the opening on the mounting port 20 side of the screen 22 and the sandwiched portion 23 c is abutted against the opening end of the screen 22 on the mounting port 20 side. The opening on the mounting port 22 side of the screen 22 is closed by a cover member 23. The inner wall of the flow path 15 on the mounting port 20 side is formed by the covering portion 23 b of the cover member 23. Further, the sandwiched portion 23 c of the cover member 23 is sandwiched between the stepped portion 12 a of the housing 12 and the cap 21, whereby the screen 22 is fixed to the housing 12 together with the cover member 23. . An O-ring 24 as a sealing material that contacts the held portion 23 c of the cover member 23 is attached to the stepped portion 12 a of the housing 12, and the mounting opening 20 is sealed between the housing 12 and the cover member 23. ing.

  As shown in FIG. 2, in a state where the cover member 23 is fixed between the stepped portion 12 a of the housing 12 and the cap 21, the housing chamber 23 a of the cover member 23 and the housing groove 21 a of the cap 21 are in communication. A magnet housing chamber is formed by the housing chamber 23a and the housing groove 21a. In the magnet housing chamber, a cylindrical permanent magnet 25 is arranged with its axial direction directed in the axial direction of the screen 22 in order to remove magnetic foreign matters such as fine metal pieces in the fluid. The permanent magnet 25 is disposed in the mounting opening 20 and is fixed between the cover member 23 and the cap 12, and on the inner side of the screen 22, the end face of the permanent magnet 25 facing the inflow port 13 side, that is, the flow path 15 side. The magnetic force generated on the side is working. In addition, the surface of the permanent magnet 25 facing the flow path 15 is covered with the cover member 23 and is blocked from the fluid flowing in the flow path 15, and the permanent magnet 25 is corroded by contact with the fluid. Is to be prevented.

  The fluid supplied to the strainer device 11 flows into the screen 22 from the inflow port 13, passes through the screen 22, and flows out from the outflow port 14. At this time, the fluid flowing into the screen 22 from the inflow port 13 flows toward the attachment port 20 along the communication direction between the inflow port 13 side and the screen storage chamber 16. The foreign matter inside will be pushed away to the mounting port 20 side. The foreign matter A having magnetism such as a minute metal piece out of the foreign matter pushed away to the mounting port 20 side is attracted by the magnetic force generated on the end face side facing the inflow port 13 side of the permanent magnet 25 arranged in the mounting port 20. The cover member 23 is attached to the outer surface of the covering portion 23b. Further, the foreign matter B that does not have magnetism, such as dust, is collected by the mesh of the screen 22 when passing through the screen 22. As a result, foreign matter in the fluid is filtered by the strainer device 11, so that it is possible to prevent malfunction due to foreign matter biting into the fluid device provided on the downstream side of the strainer device 11. . When the mesh of the screen 22 is clogged or magnetic foreign matter A is laminated on the cover member 23, the screen 22 and the cover member 23 are removed from the attachment port 20, and the foreign matter A, By removing B, the strainer device 11 can be used repeatedly.

  As described above, the foreign matter A having magnetism in the fluid pushed away to the mounting port 20 side by the flow of the fluid flowing into the screen 22 from the inflow port 13 side flows into the permanent magnet 25 arranged in the mounting port 20. Since it was made to adhere to the outer surface of the cover member 23 by the magnetic force generated on the end surface side facing the port 13 side, the permanent magnet 25 and the cover member 23 are formed in a rod shape without projecting into the flow path 15. It becomes possible to remove the foreign matter A having magnetism in the fluid. As a result, the magnetic foreign matter A adheres to the outer surface of the cover member 23 in the vicinity of the inner wall of the flow path 15 where the flow velocity of the fluid is relatively small. Therefore, the magnetic foreign matter attached to the outer surface of the cover member 23. A is prevented from being peeled off again by the fluid, and foreign matter in the fluid can be efficiently removed.

  Further, as compared with the case where the permanent magnet 25 and the cover member 23 are protruded into the flow path 15, the flow path inside the screen 22 is substantially widened, and the resistance to the fluid flowing into the screen 22 is reduced. . Therefore, the energy loss of the fluid flowing in the fluid piping path is reduced, so that the driving efficiency of the fluid device can be improved. Furthermore, since the permanent magnet 25 has a cylindrical shape, a commercially available product can be used for the permanent magnet 25, and it is not necessary to form the cover member 23 in the shape of a rod. 11 manufacturing cost can be reduced.

  As described above, in the strainer device 11 shown in FIGS. 1 to 3, the attachment port 20 is sealed between the cover member 23 and the housing 12, and the permanent magnet 25 is sealed with the cover member 23 and the cap 21. The permanent magnets 25 are shielded from the fluid flowing in the flow path 15 by arranging them in between, but the present invention is not limited to this. 4 is a cross-sectional view showing the strainer device according to the second embodiment of the present invention, FIG. 5 is a cross-sectional view showing a part of the strainer device of FIG. 4, and FIG. 6 is a strainer of FIG. It is sectional drawing which decomposes | disassembles and shows an apparatus. 7 is a cross-sectional view showing the strainer device of the third embodiment of the present invention, FIG. 8 is a cross-sectional view showing a part of the strainer device of FIG. 7, and FIG. 9 is an exploded view of the strainer device of FIG. It is sectional drawing shown. 4 to 9, members similar to those shown in FIGS. 1 to 3 are denoted by the same reference numerals and description thereof is omitted.

  The strainer device 30 shown in FIG. 4 is a strainer device with a built-in permanent magnet that includes a permanent magnet 25 for removing magnetic foreign matter such as fine metal pieces in a fluid. A cap 31 is detachably attached to the large diameter portion 20 b of the attachment port 20 formed in the housing 12, and the attachment port 20 is closed by the cap 31.

  The screen 22 detachably mounted in the screen storage chamber 16 is inserted into the large-diameter portion 17 b of the communication hole 17 at the opening end on the inflow port 13 side, and is abutted against the step portion 18 a of the partition wall 18. Yes. On the other hand, as shown in FIG. 5, the opening end of the screen 22 on the mounting port 20 side is inserted into the small diameter portion 20 a of the mounting port 20, and the cover member 32 abuts the opening end of the screen 22 on the mounting port 20 side. It has been. That is, the screen 22 is disposed from the attachment port 20 into the flow path 15 and is fixed between the partition wall 18 and the cover member 32.

  The cover member 32 formed of a non-magnetic material such as stainless steel has a bottomed cylindrical covering portion 33b in which a storage chamber 33a opening on the cap 31 side is formed, and a radial direction from the opening end of the covering portion 33b. The housing member 33 includes a sandwiched portion 33c that extends outward, and a disc-shaped closing member 34 that abuts against the opening end of the housing member 33 to close the housing chamber 33a. The housing member 33 and the closing member 34 are fixed to each other by a fixing means such as welding at a sandwiched portion 33c of the housing member 33 and a sandwiched portion 34a formed on the outer peripheral portion of the closing member 34. 32 is formed in a state where the magnet accommodation chamber is hermetically sealed by the accommodation chamber 33a.

  In the cover member 32, the covering portion 33 b protrudes into the opening portion on the attachment port 20 side of the screen 22, and the sandwiched portion 33 c is abutted against the opening end portion of the screen 22 on the attachment port 20 side. The opening on the mounting port 20 side of the screen 22 is closed by a cover member 32. The inner wall of the flow path 15 on the mounting port 20 side is formed by the covering portion 33 b of the cover member 32. Further, the sandwiched portions 33 c and 34 a of the cover member 32 are sandwiched between the opening end of the screen 22 on the mounting opening 20 side and the cap 31, so that the screen 22 together with the cover member 32 is housed in the housing 12. It is fixed against. An O-ring 24 as a sealing material that comes into contact with the cap 31 is attached to the stepped portion 12 a of the housing 12, and the mounting opening 20 is sealed between the housing 12 and the cap 31.

  In the magnet housing chamber formed in the cover member 32, the cylindrical permanent magnet 25 has its axial direction in the axial direction of the screen 22 in order to remove magnetic foreign matter such as fine metal pieces in the fluid. It is arranged toward. The permanent magnet 25 is fixed in a cover member 32 disposed in the mounting opening 20, and a magnetic force generated on the inner side of the screen 22 on the end face side of the permanent magnet 25 facing the inflow port 13 side, that is, the flow path 15 side. is working. Further, the permanent magnet 25 is covered with the cover member 32 and is blocked from the fluid flowing in the flow path 15, so that the permanent magnet 25 is prevented from being corroded by liquid contact with the fluid. ing.

  As described above, in the strainer device 30 illustrated in FIGS. 4 to 6, the attachment port 20 is sealed between the cap 31 and the housing 12, and the permanent magnet 25 is covered with the cover member 32. The permanent magnet 25 is cut off from the fluid flowing in the flow path 15. Needless to say, the strainer device 30 can achieve the same effects as the strainer device 11 described above. Further, in the strainer device 30 of the present embodiment, the permanent magnet 25 and the cover member 32 are unitized by covering the permanent magnet 25 with the cover member 32, so that the permanent magnet 25 and the cover member 32 can be easily attached and detached. It is possible to do it.

  Subsequently, a strainer device 40 shown in FIG. 7 is a strainer device with a built-in permanent magnet provided with a permanent magnet 25 for removing magnetic foreign matters such as fine metal pieces in a fluid. A cap 41 is detachably attached to the large diameter portion 20 b of the attachment port 20 formed in the housing 12, and the attachment port 20 is closed by the cap 41. The cap 41 is fitted with an O-ring 42 as a seal member that contacts the opening end of the housing 12 on the mounting port 20 side. The mounting port 20 is sealed between the cap 41 and the housing 12. In the strainer device 40 of this embodiment, the O-ring 42 is attached to the cap 41. However, the O-ring 24 is attached to the step portion 12a of the housing 12 like the strainer devices 11 and 30 of the above-described embodiment. Thus, the attachment port 20 may be sealed between the cap 41 and the housing 12.

  The screen 22 detachably mounted in the screen storage chamber 16 is inserted into the large-diameter portion 17 b of the communication hole 17 at the opening end on the inflow port 13 side, and is abutted against the step portion 18 a of the partition wall 18. Yes. On the other hand, as shown in FIG. 8, the opening end of the screen 22 on the mounting port 20 side is inserted into the small diameter portion 20a of the mounting port 20, and the cover member 43 abuts the opening end of the screen 22 on the mounting port 20 side. It has been. That is, the screen 22 is disposed from the attachment port 20 into the flow path 15 and is fixed between the partition wall 18 and the cover member 43.

  The cover member 43 formed of a non-magnetic material such as stainless steel includes a bottomed cylindrical covering portion 43b in which a storage chamber 43a opening on the cap 41 side is formed, and a radial direction from the opening end of the covering portion 43b. A contact portion 43c extending outward. The cover member 43 is arranged in a state where the covering portion 43b protrudes into the opening portion of the screen 22 on the mounting port 20 side and the contact portion 43c is abutted against the opening end portion of the screen 22 on the mounting port 20 side. The opening on the mounting port 20 side of the screen 22 is closed by the cover member 43. The inner wall of the flow path 15 on the mounting port 20 side is formed by the covering portion 43 b of the cover member 43. The cover member 43 is formed integrally with the cap 41 on the screen housing chamber 16 side, and the screen 22 is fixed to the housing 12 together with the cover member 43 by attaching the cap 41 to the attachment port 20. .

  In the cap 41, an accommodation hole 41 a that communicates with the accommodation chamber 43 a of the cover member 43 and opens to the side opposite to the cover member 43 side is formed. A female screw for attaching a fixing screw is cut on the opening side of the accommodation hole 41a, and a fixing screw 44 is detachably attached to the accommodation hole 41a so that the opening side of the accommodation hole 41a is closed. Thus, a magnet accommodation chamber is formed in the cap 41 by the accommodation chamber 43 a of the cover member 43 and the accommodation hole 41 a of the cap 41. In the magnet housing chamber, a cylindrical permanent magnet 25 is arranged with its axial direction directed in the axial direction of the screen 22 in order to remove magnetic foreign matters such as fine metal pieces in the fluid. The permanent magnet 25 is fixed in a cap 41 attached to the attachment port 20, and a magnetic force generated on the inner side of the screen 22 on the end face side of the permanent magnet 25 facing the inflow port 13 side, that is, the flow path 15 side. is working. Further, the permanent magnet 25 is covered with a cover member 43 formed integrally with the cap 41 on the surface facing the flow path 15 so as to be shielded from the fluid flowing in the flow path 15. This prevents the permanent magnet 25 from being corroded.

  As described above, in the strainer device 40 illustrated in FIGS. 7 to 9, the mounting opening 20 is sealed between the cap 41 formed integrally with the cover member 43 and the housing 12, and the permanent magnet 25 is capped. By arranging in 41, the permanent magnet 25 is shielded from the fluid flowing in the flow path 15. Needless to say, the strainer device 40 can achieve the same effects as the strainer device 11 described above. In the present embodiment, since the permanent magnet 25 is detachably fixed in the cap 41 formed integrally with the cover member 43, the magnetic foreign matter attached to the outer surface of the cover member 43 is removed. At this time, by removing the permanent magnet 25 from the cap 41 and preventing the magnetic force from acting on the magnetic foreign matter attached to the cover member 43, the foreign matter attached to the cover member 43 can be easily removed. ing. In the strainer device 11 described above, it is a matter of course that the foreign matter attached to the cover member 23 can be easily removed by removing the permanent magnet 25 from the cover member 23.

  In addition, as described so far, in the strainer devices 11, 30, and 40 shown in FIGS. 1 to 9, the cylindrical permanent magnet 25 is used, but is not limited to this. For example, A disk-shaped permanent magnet may be used. Here, FIG. 10 is a cross-sectional view showing a partially enlarged variation of the strainer device shown in FIG. In FIG. 10, members similar to those shown in FIG. 2 are given the same reference numerals, and descriptions thereof are omitted.

  A strainer device 50 shown in FIG. 10 is a strainer device with a built-in permanent magnet provided with a permanent magnet 51 for removing minute foreign matter having magnetism such as a minute metal piece in a fluid. A cap 21 is detachably attached to the large-diameter portion 20 b of the attachment port 20 formed in the housing 12, and the attachment port 20 is closed by the cap 21. The cap 21 is formed with a circular accommodation groove 21 a that opens to the screen accommodation chamber 16 side.

  The screen 22 detachably mounted in the screen storage chamber 16 has an opening end on the inflow port 13 side inserted into the large diameter portion 17 a of the communication hole 17 and abuts against the step portion 18 a of the partition wall 18. Yes. On the other hand, the opening end of the screen 22 on the mounting port 20 side is inserted into the small diameter portion 20 a of the mounting port 20, and the cover member 52 is abutted against the opening end of the screen 22 on the mounting port 20 side. That is, the screen 22 is disposed from the attachment port 20 into the flow path 15 and is fixed between the partition wall 18 and the cover member 52.

  The cover member 52 formed of a nonmagnetic material such as stainless steel has a disk shape that comes into contact with the stepped portion 12 a of the housing 12. The cover member 52 is disposed in a state of being abutted against the opening end portion of the screen 22 on the mounting port 20 side, and the opening portion of the screen 22 on the mounting port 20 side is closed by the cover member 52. The inner wall of the flow path 15 on the mounting port 20 side is formed by a cover member 52. Further, the sandwiched portion 52 a formed on the outer peripheral portion of the cover member 52 is sandwiched between the step portion 12 a of the housing 12 and the cap 21, so that the screen 22 together with the cover member 52 is attached to the housing 12. It is fixed against. An O-ring 24 that comes into contact with the held portion 52 a of the cover member 52 is attached to the stepped portion 12 a of the housing 12, and the attachment port 20 is sealed between the housing 12 and the cover member 52.

  In a state where the cover member 52 is fixed between the stepped portion 12a of the housing 12 and the cap 21, the accommodation groove 21a of the cap 21 is closed by the cover member 52, and a magnet accommodation chamber is formed by the accommodation groove 21a. Yes. In the magnet housing chamber, a disk-shaped permanent magnet 51 is arranged with its axial direction directed in the axial direction of the screen 22 in order to remove magnetic foreign matter such as fine metal pieces in the fluid. . The permanent magnet 51 is disposed in the mounting opening 20 and is fixed between the cover member 52 and the cap 21, and on the inner side of the screen 22, an end face of the permanent magnet 51 facing the inflow port 13 side, that is, the flow path 15 side. The magnetic force generated on the side is working. Further, the surface of the permanent magnet 51 facing the flow path 15 is covered with the cover member 52 and is blocked from the fluid flowing in the flow path 15, and the permanent magnet 51 is corroded by contact with the fluid. Is to be prevented.

  As described above, in the strainer device 50 shown in FIG. 10, since the permanent magnet 51 has a disk shape, a commercially available product can be used for the permanent magnet 51, and the cover member 52 has a disk shape. Therefore, the cover member 52 can be easily molded, and the manufacturing cost of the strainer device 50 can be reduced. Needless to say, the strainer device 50 can achieve the same effects as the strainer device 11 described above. In the present embodiment, the magnet housing chamber is formed by the housing groove 21a of the cap 21, but the housing groove 21a is formed in the cap 21 by using the cover member 23 shown in FIG. Instead, the permanent magnet storage chamber may be formed by the storage chamber 23 a of the cover member 23. Further, in the present embodiment, as a modification of the strainer device 11 shown in FIG. 1, the strainer device 50 in which the disk-shaped permanent magnet 51 is used has been described, but the strainer devices 30 and 40 similarly. A disk-shaped permanent magnet 51 may be used.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above-described embodiment, the cover members 23, 32, 52 of the strainer devices 11, 30, 50 are sandwiched between the caps 21, 31 and the housing 12 or the screen 22, thereby covering the cover members 23, 32. , 52 is fixed to the housing 12, but the cover members 23, 32, 52 may be fixed to the caps 21, 32 by fixing means such as welding.

DESCRIPTION OF SYMBOLS 11 Strainer apparatus 12 Housing 12a Step part 13 Inflow port 14 Outflow port 15 Flow path 16 Screen accommodation chamber 17 Communication hole 17a Small diameter part 17b Large diameter part 18 Bulkhead 18a Step part 20 Mounting port 20a Small diameter part 20b Large diameter part 21 Cap 21a accommodation Groove 22 Screen 23 Cover member 23a Accommodating chamber 23b Covered portion 23c Nipped portion 24 O-ring 25 Permanent magnet 30 Strainer device 31 Cap 32 Cover member 33 Accommodating member 33a Accommodating chamber 33b Covered portion 33c Enclosed portion 34 Closing member 34a Covered Clamping part 40 Strainer device 41 Cap 41a Housing hole 42 O-ring 43 Cover member 43a Housing chamber 43b Covering part 43c Abutting part 44 Fixing screw 50 Strainer device 51 Permanent magnet 52 Cover member 52a Nipped part A Have Foreign matter having no magnetic foreign matter B fluid

Claims (5)

A housing having an inflow port to which a fluid is supplied and an outflow port through which the fluid flows out, wherein a mounting port is formed in a flow path that connects the inflow port and the outflow port;
A cap that is detachably attached to the attachment port, and closes the attachment port;
A screen that is formed in a cylindrical shape that opens to the inflow port side and the mounting port side, and is detachably mounted in the flow path from the mounting port to collect foreign matter in the fluid;
A cover member that is formed of a non-magnetic material and closes the opening on the attachment port side of the screen;
A magnet disposed on the attachment port in a state of being shielded from the fluid by the cover member, and for adhering foreign matter having magnetism in the fluid to the cover member by a magnetic force generated on an end surface facing the inflow port side. A strainer device characterized by that.   The strainer device according to claim 1, wherein the attachment port is sealed between the cover member and the housing, and the magnet is disposed between the cover member and the cap. .   The strainer device according to claim 1, wherein the attachment port is sealed between the cap and the housing, and the magnet is covered with the cover member.   The strainer device according to claim 1, wherein the attachment port is sealed between the cap and the housing formed integrally with the cover member, and the magnet is disposed in the cap. Strainer device.   The strainer apparatus of any one of Claims 1-4 WHEREIN: The said magnet is formed in the cylindrical shape or disk shape, The strainer apparatus characterized by the above-mentioned.

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