JP2009150485A - Filter mounting structure to body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce costs and to miniaturize a body while surely capturing foreign matter in a filter mounting structure to the body fixing the filter to the body with the filter inserted in a recess of the body. <P>SOLUTION: A part of the recess 111A is made upstream of a passage 110, and a flat annular abutting surface 116 is formed to face radially outward in the body 15A along a flat surface orthogonal to the axis line of the recess 111A. Moreover, a metal filter 20A is formed in a cylindrical shape with a bottom having its one end in an axial direction becoming the inner end when inserted in the recess 111A as an open end, and an annular abutting surface 117 abutting on the abutting surface 116 is formed in one end of the filter 20A. Furthermore, a press fitting surface 118 press-fitted in the recess 111A is provided at least in the periphery on one end side in the axial direction of the filter 20A, and an annular chamfer 119 is formed in the periphery on one end of the filter 20A to connect the periphery of the abutting surface 117 and the press fitting surface 118. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  In the present invention, the body is provided with a recess having an outer end opened on a side surface of the body, and a passage continuing to the inner end of the recess, and the filter for purifying the fluid introduced into the passage is the recess. It is related with the filter attachment structure to the body fixed to the said body in the state inserted in.

The filter is inserted into the recess so as to be in contact with the inner end of the recess provided in the body of the gas pressure reducing valve, and a spring is interposed between the filter and the outer end of the recess. Patent Document 1 discloses that a pipe joint is screwed and the filter is fixed to the body in the recess so as to be pressed against the inner end of the recess by the elastic force of the spring.
JP 2002-180907 A

  By the way, in what was disclosed by the said patent document 1, the cyclic | annular space | gap has arisen between the inner periphery of a recessed part, and the outer periphery of a filter, A filter can incline that axis line with respect to the axis line of a recessed part, and can be fixed to a body. In this case, there is a possibility that a gap is generated between the inner end of the recess and the filter, and foreign matter flows out downstream.

  In addition, since the spring is contracted between the pipe joint and the filter, the increase in the number of parts causes an increase in cost, and the space for placing the spring needs to be secured in the recess, thereby increasing the size of the body. I will invite you.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a structure for attaching a filter to a body capable of reliably capturing foreign matter while enabling cost reduction and size reduction of the body. And

  In order to achieve the above object, according to the first aspect of the present invention, a body is provided with a recess having an outer end opened on a side surface of the body, and a passage continuing to the inner end of the recess, and is introduced into the passage. In a structure for attaching a filter to a body that is fixed to the body in a state where a filter for purifying a fluid to be purified is inserted into the recess, the filter includes a part of the recess on the upstream side of the passage. A flat annular abutment surface is formed on the body along a plane orthogonal to the axis, and the metal filter has one end in the axial direction that becomes an inner end when inserted into the recess. An annular contact surface that is formed in a bottomed cylindrical shape as an open end, is formed at the one end of the filter, and a press-fitting surface that is press-fitted into the recess is at least one axial end of the filter. Set on the outer periphery It is, and wherein said that the circular chamfer on one end periphery of the filter so as to connecting the outer and the press-fitting surface of the abutment surface is formed.

  According to a second aspect of the invention, in addition to the configuration of the first aspect of the invention, the valve mechanism of the gas pressure reducing valve is accommodated in the body so as to be interposed between the high pressure chamber and the pressure reducing chamber communicating with the passage. It is characterized by being.

  In order to achieve the above object, according to a third aspect of the present invention, the body is provided with a recess having an outer end opened on a side surface of the body and a passage continuing to the inner end of the recess, and is introduced into the passage. In a structure for attaching a filter to a body fixed to the body in a state where a filter for purifying a fluid to be purified is inserted into the recess, the metal filter is an inner shaft when inserted into the recess One end in the direction is an open end, and an annular flange portion projecting radially outward from the one end is formed integrally with a bottomed cylindrical shape, and a flow path to be connected to the passage is formed to form the body A fluid-tightly attached flow path forming body is provided with a cylindrical portion that press-fits at least the annular flange side outer periphery of the filter until one end abuts against the annular flange and is coaxially inserted into the recess. The circle Wherein the chamfered portion of the annular is formed in one end periphery of the part.

  According to a fourth aspect of the invention, in addition to the configuration of the third aspect of the invention, the valve mechanism of the gas pressure reducing valve is accommodated in the body so as to be interposed between the high pressure chamber and the pressure reducing chamber that communicate with the passage. The flow path forming body is an inlet joint.

  Furthermore, the invention according to claim 5 is such that, in addition to the configuration of the invention according to claim 3 or 4, the filter is formed so that a press-fitting surface into which the cylindrical portion of the flow path forming body is press-fitted is formed on the outer periphery. A large-diameter cylindrical portion whose one end is coaxially connected to the annular flange portion and a small-diameter cylindrical portion which is formed with a smaller diameter than the large-diameter cylindrical portion and has one end coaxially connected to the other end of the large-diameter cylindrical portion. An annular flow path is formed between the inner periphery of the cylindrical portion of the flow path forming body and the small diameter cylindrical portion.

  The high pressure filter 20A of the first embodiment and the high pressure filter 20B of the second embodiment correspond to the filter of the present invention, and the inlet joint 112B of the second embodiment corresponds to the flow path forming body of the present invention. The mounting cylinder portion 135 in the example corresponds to the cylindrical portion of the present invention.

  According to the first aspect of the present invention, since the filter is fixed to the body by being press-fitted into the concave portion of the body, there is no gap between the concave portion and the filter, and foreign matters can be reliably captured by the filter. it can. In addition, since no other member such as a spring is used for fixing the filter, the space required for fixing the filter can be reduced, the cost can be reduced and the body can be downsized. Versatility can be improved. Furthermore, the chips generated when the filter is pressed into the recess are sealed between the annular chamfered portion on the outer periphery of one end of the filter and the inner peripheral surface and the abutting surface of the recess. The chips do not flow out to the side of the passage connected to the section, and the chips on the upstream side of the filter are captured by the filter, so that there is no problem.

  According to the second aspect of the present invention, the filter reliably prevents foreign matter from entering the high pressure chamber of the gas pressure reducing valve, and the valve mechanism reliably prevents the occurrence of a sheet failure due to biting of the foreign matter. It is possible to reduce the size of the gas pressure reducing valve.

  According to the third aspect of the present invention, the filter is fixed to the body by inserting the cylindrical portion coaxially into the concave portion and press-fitting into the cylindrical portion of the flow path forming body attached fluidly to the body. There is no gap between the flow path forming body forming the path and the filter, and foreign matters can be reliably captured by the filter. In addition, since no other member such as a spring is used for fixing the filter, the space required for fixing the filter can be reduced, the cost can be reduced and the body can be downsized. Versatility can be improved. Furthermore, chips generated when the filter is pressed into the cylindrical portion of the flow path forming body are formed between the annular chamfered portion on the inner periphery of one end of the cylindrical portion, the annular flange portion of the filter, and the outer peripheral surface near the annular flange portion. Therefore, the chips do not flow out to the side of the passage connected to the inner end of the recess, and the chips on the upstream side of the filter are trapped by the filter, so that there is no problem.

  According to the fourth aspect of the present invention, the filter reliably prevents foreign matter from entering the high-pressure chamber of the gas pressure reducing valve, and the valve mechanism reliably prevents the occurrence of a sheet failure due to biting of the foreign matter. It is possible to reduce the size of the gas pressure reducing valve. In addition, since the filter is press-fitted into the inlet joint before the inlet joint is fixed to the body, it is easy to check the assembled state of the filter, it is possible to attach the filter reliably, and quality and productivity can be improved.

  Furthermore, according to the invention described in claim 5, the filter integrally includes a large-diameter cylindrical portion that is press-fitted into the cylindrical portion of the flow path forming body and a small-diameter cylindrical portion that is coaxially connected to the large-diameter cylindrical portion. Since the annular flow path is formed between the inner circumference of the cylindrical portion of the path forming body and the small diameter cylindrical portion, the flow area of the filter can be sufficiently secured, and the flow rate can be secured.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.

  1 and 2 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a gas pressure reducing valve, and FIG. 2 is an enlarged view of a portion indicated by an arrow 2 in FIG.

  First, in FIG. 1, this gas pressure reducing valve is for reducing the pressure of compressed natural gas, which is a fluid, and supplying it to an engine (not shown), and the first and second body members 17A, 18 are mutually connected. A body 15A coupled to the body 15A and a diaphragm cover 16 coupled to the body 15A are provided. In the body 15A, a valve mechanism 19 is accommodated and a high-pressure filter 20A and a relief valve 21 are disposed.

  The body 15A is formed by fastening the first and second body members 17A and 18 at a plurality of locations while overlapping each other. In the central portion of the first body member 17, there is provided a receiving hole 23 having an inward flange 22 projecting radially inward at the upper end and extending vertically. In order from the 22 side, a small diameter hole 23a, a screw hole 23b having a diameter larger than that of the small diameter hole 23a, and a large diameter hole 23c having a diameter larger than that of the screw hole 23b are coaxially connected. The lower end is opened downward at the lower end surface of the first body member 17A.

  The valve mechanism 19 is driven by a diaphragm 28 and is coupled to the valve guide member 30 by forming a valve guide member 30 having a guide hole 29 and a valve chamber 32 between the valve guide member 30. And a valve seat member 31 provided with a valve seat 34 facing the valve chamber 32 by opening a valve hole 33 coaxial with the guide hole 29 in the center, and the guide hole while loosely passing through the valve hole 33 A valve shaft 35 slidably fitted to the valve seat 29, and a valve body 36 that can be seated on the valve seat 34 and is fixed to the valve shaft 35 in the valve chamber 32. The valve mechanism 19 is attached to the first body member 17A of the body 15A so as to be interposed between the high pressure chamber 37 communicating with the valve chamber 32 and the decompression chamber 38 communicating with the valve hole 33.

  The valve body 36 is mounted on the outer periphery of the valve shaft 35 with an annular seal member 44 elastically contacting the inner periphery of the valve body 36 interposed between the valve shaft 35 and the valve shaft 35. An annular seal member 45 slidably in contact with the inner periphery of the guide hole 29 is attached to the outer periphery of a portion of the valve shaft 35 slidably fitted in the guide hole 29, and the valve guide member 30 and the valve A cylindrical filter 46 interposed between the high pressure chamber 37 and the valve chamber 32 is mounted and supported on the seat member 31.

  By the way, the valve mechanism 19 having the valve body 36, the valve shaft 35, the valve guide member 30 and the valve seat member 31, and the filter 46 mounted and supported on the valve guide member 30 and the valve seat member 31; The valve mechanism unit 51 is configured by assembling the filter 46 in the valve mechanism 19 in advance, and the valve mechanism unit 51 is attached to the first body member 17A of the body 15A.

  The valve mechanism unit 51 is inserted into the small diameter hole 23 of the accommodation hole 23 provided in the first body member 17A from the valve seat member 31 side and attached to the first body member 17A of the body 15A. A small-diameter hole in the receiving hole 23 so that an annular seal member 52 that is mounted on the surface of the valve seat member 31 facing the inward flange 22 and coaxially surrounds the valve hole 33 is brought into elastic contact with the inward flange 22. An annular seal member 53 is attached to the outer periphery of the valve guide member 30 and elastically contacts the inner periphery of the small diameter hole 23a. When the valve mechanism unit 51 is inserted into the small diameter hole 23 a, an annular high pressure chamber 37 is formed between the inner periphery of the small diameter hole 23 a and the valve mechanism unit 51.

  A ring-shaped pressing member 55 that abuts the valve guide member 30 and clamps the valve guide member 30 and the valve seat member 31 with the inward flange 22 is screwed into the screw hole 23b of the accommodation hole 23. Is done. Thus, one end of the valve shaft 35 in the valve mechanism unit 51 protrudes from the guide hole 29 of the valve guide member 30, and a screw hole 56 having a larger diameter than the valve shaft 35 is formed in the pressing member 55. Is provided coaxially with the valve shaft 35 so that one end of the valve shaft 35 is inserted. In addition, a tool (not shown) for rotating the pressing member 55 to be screwed into the screw hole 23b can be engaged with and disengaged from the end surface of the pressing member 55 opposite to the valve mechanism unit 51. A bottomed engagement hole 57 for mating is provided.

  The opening end of the accommodation hole 23 is hermetically closed by the adjustment member 58. The adjusting member 58 includes a large-diameter portion 58a that is fitted on the large-diameter hole 23c, and an annular seal member 59 that elastically contacts the inner surface of the large-diameter hole 23c in the accommodation hole 23. The male screw 60 that is formed to have a smaller diameter than the large-diameter portion 58a and that engages with the screw hole 56 of the pressing member 55 is engraved on the outer periphery, and is coaxially and integrally connected to the large-diameter portion 58a. A small-diameter portion 58b provided and a tool engaging portion 58c formed in, for example, a hexagonal shape so as to be able to engage with a tool (not shown) and projecting coaxially from one end of the large-diameter portion 58a are integrated. Have. Thus, when the male screw 60 is screwed into the screw hole 56 of the holding member 55 and the tool is engaged with the tool engaging portion 58c and rotated, the adjusting member 58 is connected to the valve shaft of the valve mechanism unit 51. It is possible to advance and retreat in the direction along the axis coaxial with 35.

  The adjusting member 58 is provided with a bottomed receiving recess 61 that is open to the valve shaft 35 side, coaxially with the valve shaft 35, and a spring receiving member 62 attached to one end of the valve shaft 35, and the storage A back coil spring 63 is contracted between the closed end of the recess 61. Thus, the spring load of the back coil spring 63 can be adjusted by adjusting the advance / retreat position along the axial direction of the adjustment member 58 by rotating the adjustment member 58.

  The second body member 18 is provided with a partition wall 64 positioned at an intermediate portion along the axis of the valve mechanism 19 disposed on the first body member 17A side. On the other hand, the first body member 17A integrally has a fitting protrusion 17a fitted to the lower part of the second body member 18, and the outer periphery of the fitting protrusion 18a is connected to the second body member 18. An annular seal member 68 interposed therebetween is attached. Thus, the first and second body members 17A, 18 surround the fitting protrusion 17a and the first body member 17A while the fitting protrusion 17a is fitted to the lower portion of the second body member 18. Are connected by bolts (not shown) so as to interpose an annular seal member 69 mounted between the first and second body members 17A, 18 in the coupled state of the fitting protrusion 17a. A decompression chamber 38 is formed between the tip and the partition wall 64, and the decompression chamber 38 communicates with the valve hole 33 of the valve mechanism 19.

  The second body member 18 is provided with an outlet passage 72 that opens an inner end on the inner surface of the decompression chamber 38 so that the axis line extends along the radial direction of the decompression chamber shape 38. That is, the outlet passage 72 communicates with the decompression chamber 38 and is connected to the outlet passage 72 so as to be coaxial with the outlet passage connection hole 73 provided in the second body member 18 for outlet of the decompressed compressed natural gas. A tube (not shown) is hermetically connected by press fitting or the like.

  The relief valve 21 opens as the pressure in the decompression chamber 38 becomes equal to or higher than a set pressure, and the valve body is fixed to the second body member 18 of the body 15A and the second body member 18. 75, a valve body 76 guided by the valve housing 75, and a spring 77 contracted between the valve housing 75 and the valve body 76.

  The second body member 18 includes a valve hole 78 that is arranged coaxially with the outlet passage 72 and communicates with the decompression chamber 38, and an annular valve seat 80 that faces the valve hole 78 at the center. A mounting hole 79 formed at the end and having a diameter larger than that of the valve hole 78 is provided coaxially and the outer end of the mounting hole 79 is opened to the outside.

  The valve housing 75 includes a guide cylinder 81 having a small diameter at one end and a stepped cylindrical shape, and a cap 82 that is press-fitted and fixed to the other end of the guide cylinder 81. One end of the cap 82 is press-fitted into the mounting hole 79, and the cap 82 is provided with an external opening hole 83.

  The valve body 76 is slidably fitted to one end side of the guide cylinder 81 in the valve housing 75, and the valve body 75, the valve body 76, and the second body member 18 have a valve A chamber 84 is formed. In addition, the valve body 76 is formed in a bottomed cylindrical shape with the valve hole 78 side as a closed end, and a plurality of communication holes 85 that communicate with the valve chamber 84 are provided on the side wall of the valve body 76. The valve chamber 84 is opened to the outside through the communication holes 85, the inside of the valve body 76 and the external opening hole 83.

  An annular seat portion 86 made of rubber, for example, is provided on the outer surface of the valve body 76 on the side of the valve hole 78, and exhibits a spring force in a direction in which the seat portion 86 is seated on the valve seat 80. A spring 77 is contracted between the cap 82 and the valve body 76 in the valve housing 75.

  The diaphragm 28 is formed of a disc-shaped rubber plate in which at least the peripheral edge portion and the central portion of the diaphragm 28 are constant in a natural state. In this embodiment, the thickness of the diaphragm 28 in the natural state is the thickness. It is formed in a disk shape with a constant. The peripheral portion of the diaphragm 28 is sandwiched between the second body member 18 in the body 15A and the diaphragm cover 16 fixed to the second body member 18, and the second body member 18 and the diaphragm 28 are sandwiched between the second body member 18 and the diaphragm cover 16. A pressure working chamber 88 is formed between the diaphragm 28 and the diaphragm cover 16 so as to face one surface of the diaphragm 28, and a spring chamber 89 is formed between the diaphragm 28 and the diaphragm cover 16. A coiled spring 90 to be accommodated is contracted between the diaphragm cover 16 and the diaphragm 28.

  The diaphragm cover 16 is formed in a substantially bottomed cylindrical shape, and the open end portion of the diaphragm 28 sandwiches the peripheral portion of the diaphragm 28 with the second body member 18 in the body 15A. The second body member 18 is caulked and joined.

  A ring-shaped first retainer 94 is brought into contact with a central portion of the surface of the diaphragm 28 facing the pressure acting chamber 88, and a central portion of the diaphragm 28 is disposed at a central portion of the surface of the diaphragm 28 facing the spring chamber 89. The ring-shaped second retainer 95 is held in contact with the first retainer 94.

  On the other hand, the other end of the diaphragm rod 96, one end of which is connected to the valve body 36 of the valve mechanism 19, is connected to the central portion of the diaphragm 28, and the other end of the diaphragm rod 96 is connected to the pressure working chamber. A shaft portion 96b is coaxially and integrally provided so as to form an annular step portion 96a facing the diaphragm 28 on the 88 side, and a male screw 97 is engraved on the outer periphery of the shaft portion 93b. The shaft portion 96b is inserted into the central portion of the first retainer 94, the diaphragm 28 and the second retainer 95, and an annular seal member 98 is interposed between the first retainer 94 and the step portion 96a. The

  The male screw 97 includes a nut and a ring-shaped retainer common-rotation preventing member 99 that abuts against the second retainer 95 and a washer 100 that abuts against the retainer common-rotation prevention member 99. 101 is screwed, and by tightening the nut 101, the other end of the diaphragm rod 96 is connected and fixed to the center of the diaphragm 28.

  The coil spring 90 is contracted between the upper closed end of the diaphragm cover 16 and the second retainer 95, and the spring load of the coil spring 90 opens the valve shaft 35 and the valve body 36 in the valve mechanism 19. The spring load of the back coil spring 63 that is contracted between the valve shaft 35 and the adjustment member 58 acts on the valve body 36 in the valve closing direction. As a result, the spring load of the coil spring 90 is substantially adjusted.

  Further, a negative pressure introducing pipe 102 communicating with the spring chamber 89 is connected to the upper closed end of the diaphragm cover 16 by, for example, press-fitting and brazing. The negative pressure introducing pipe 102 is connected to the engine, and the spring chamber 89 is connected thereto. The engine intake negative pressure is introduced.

  The diaphragm rod 96 penetrates the central portion of the partition wall 64 in the second body member 18 so as to be movable in the axial direction, and a synthetic resin guide member 103 for guiding the axial movement of the diaphragm rod 96 is the partition wall 64. It is attached to.

  The guide member 103 has a guide portion 103a formed in a cylindrical shape by forming a guide hole 104 into which the diaphragm rod 96 is slidably fitted, and a pressure extending from the guide portion 103a outward in the radial direction. An extension portion 103b facing the partition wall 64 from the working chamber 88 side and an engagement portion 103c projecting from the extension portion 103b at a position spaced apart from the guide portion 103a are integrally provided, and the guide One end side of the portion 103a is fitted into a through hole 105 provided in the central portion of the partition wall 64 in the second body member 18, and the engagement portions 103c are elastically engaged with the partition wall 64 of the body 15A. Is attached to the partition wall 64.

  An aspirator tube 106 penetrating the partition wall 64 is integrally connected to the extension portion 103b of the guide member 103, and the aspirator tube 106 is attached to the partition wall 64 in the state where the aspirator tube 106 is mounted on the partition wall 64. It enters into the decompression chamber 38.

  The guide member 103 has a stopper portion 103d that protrudes radially outward from an end portion of the guide portion 103a on the diaphragm 28 side, and the diaphragm 28 is displaced toward the side where the volume of the pressure acting chamber 88 is reduced. Are integrally provided.

  The diaphragm rod 96 is slidably fitted into the guide hole 106 of the guide member 103, and an annular seal member 107 that is in sliding contact with the inner periphery of the guide hole 106 is attached to the outer periphery of the diaphragm rod 96. Thus, one end portion of the diaphragm rod 96 is inserted into the decompression chamber 38 from the guide hole 106, and the other end portion of the valve shaft 35 in the valve mechanism 19 is inserted into one end portion of the diaphragm rod 96 in the decompression chamber 38. Are concatenated.

  In such a gas pressure reducing valve, when the diaphragm 28 is bent toward the spring chamber 89 against the spring force of the coil spring 90 due to the pressure of the pressure acting chamber 88, the valve mechanism 19 is closed and the pressure is reduced. When the diaphragm 28 is bent toward the pressure acting chamber 88 due to the pressure drop in the working chamber 88, the valve mechanism 19 is opened, and the opening and closing of the valve mechanism 19 is repeated, whereby the high pressure chamber 37 introduced into the high pressure chamber 37 is opened. The compressed natural gas is decompressed and output from the outlet side connection hole 73.

  Referring also to FIG. 2, the high-pressure filter 20A is attached to the lower portion of the first body member 17A in the body 15A according to the present invention, and the first body member 17A of the body 15A is attached to the first body member 17A. A concave portion 111A having an outer end opened on the lower side surface and a passage 110 coaxially connected to the inner end portion of the concave portion 111A are provided. The passage 110 communicates with the high-pressure chamber 37 and is introduced into the passage 110. A high pressure filter 20A, which is a filter for purifying gas, is fixed to the first body member 17A of the body 15A while being inserted into the recess 111A.

  The concave portion 111A has a large-diameter portion 114 having an outer end opened on the lower side surface of the first body member 17A, and a smaller diameter than the large-diameter portion 114, and the outer end is coaxial with the inner end of the large-diameter portion 114. The small-diameter portion 115 is connected to the inner end of the small-diameter portion 115 and an annular abutting surface 116 that is formed as a step portion interposed between the passages 110 and faces outward in the axial direction. An internal thread 113 is engraved on the inner surface excluding the portion near the portion 115. The abutting surface 116 forms a part of the recess 111A on the upstream side of the passage 110 and is formed flat along a plane orthogonal to the axis of the recess 111A, and the outer end of the passage 110 is It is opened in the center of the abutting surface 116, and is formed in a tapered shape so as to increase in diameter as it approaches the abutting surface 116.

  The high-pressure filter 20A is formed of a metal, for example, a copper sintered material, having a bottomed cylindrical shape with one end in the axial direction serving as an inner end when being inserted into the recess 111A, and is in contact with the abutting surface 116 Is formed at the one end of the high-pressure filter 20A, and a press-fitting surface 118 to be press-fitted into the recess 111A is provided at least on the outer periphery of one end in the axial direction of the high-pressure filter 20A. An annular chamfered portion 119 is formed on the outer periphery of one end portion of the high-pressure filter 20A so as to connect the press-fitting surfaces 118.

  In the first embodiment, the high-pressure filter 20A includes a bottomed cylindrical portion 120 having one end in the axial direction serving as an inner end when inserted into the recess 111A, and a radial direction from one end of the bottomed cylindrical portion 120. It has an annular flange 121 projecting outward, and is formed by sintering metal such as copper, and the abutting surface 116 is formed on an end surface of the annular collar 121 facing the abutting surface 116. An annular abutment surface 117 that abuts on the outer periphery of the annular flange 121 is formed, and an outer periphery of the annular flange 121 is formed as a press-fit surface 118 that is press-fitted into the small diameter portion 115, and the chamfered portion 119 that is tapered is formed on the abutment surface 117. It is formed on the outer periphery of one end of the high-pressure filter 20A so as to connect the outer periphery and the press-fitting surface 118.

  An inlet joint 112A that forms a flow path 109 to be connected to the passage 110 is airtightly attached to the first body member 17A of the body 15A. The inlet joint 112A is in contact with the side surface of the first body member 17A and is capable of engaging a tool (not shown) and is formed in a non-circular flat plate shape, and a large-diameter portion in the recess 111A. A cylindrical mounting cylinder 125 connected to the center of one end surface of the tool engaging portion 124 so that a male screw 121 screwed to the female thread 113 of 114 is engraved on the outer periphery, and opposite to the mounting cylinder 125 A cylindrical connecting tube portion 126 that is continuous with the central portion of the other end surface of the tool engaging portion 124 and that has a male screw 122 engraved on the outer periphery so as to extend to the side.

  Thus, the inlet joint 112A is configured such that an annular seal member 123 that surrounds the attachment tube portion 125 is interposed between one end central portion of the tool engaging portion 124 and the first body member 17A. The inner diameter of the mounting cylinder portion 125 is set to be larger than the outer diameter of the bottomed cylindrical portion 120 of the high-pressure filter 20A. Further, a pipe line (not shown) is connected to the connecting cylinder portion 126 of the inlet joint 112A so as to be screwed to the male screw 122, and the compressed natural gas guided through the pipe line flows through the inlet pipe 112A. It is introduced into the passage 110 from the passage 109 through the high pressure filter 20A.

  Next, the operation of the first embodiment will be described. The first body member 17A of the body 15A is provided with a recess 111A that connects the passage 110 leading to the high-pressure chamber 37 to the inner end, and the outer end of the first body member 17A is connected to the first body. An annular butting surface that is provided so as to open on the lower side surface of the member 17A, forms a part of the recess 111A on the upstream side of the passage 110, and is flat along a plane orthogonal to the axis of the recess 111A 116 is formed on the first body member 17A so as to face outward in the axial direction, and the high-pressure filter 20A made of metal has a bottomed cylindrical shape with one end in the axial direction serving as an inner end when being inserted into the recess 111A being an open end. An annular contact surface 117 that is formed and is in contact with the abutting surface 116 is formed at the one end of the high-pressure filter 20A, and a press-fit surface 118 that is press-fitted into the recess 111A is a high-pressure filter. Provided at least one axial end outer periphery of 20A, an annular chamfer 119 is formed at one end portion outer periphery of the high-pressure filter 20A so as to connecting the outer and press-fitting surface 118 of the abutment surface 117.

  That is, since the high-pressure filter 20A is fixed to the body 15 by being press-fitted into the recess 111A of the first body member 17A, there is no gap between the recess 111A and the high-pressure filter 20A, and the high-pressure filter 20A can reliably prevent foreign matter. Can be captured.

  Further, since no other member such as a spring is used for fixing the high-pressure filter 20A, it is possible to reduce the space required for fixing the high-pressure filter 20A, thereby reducing the cost and reducing the size of the body 15A. This can improve the versatility.

  Further, chips generated when the high pressure filter 20A is pressed into the recess 111A are formed between the annular chamfered portion 119 on the outer periphery of one end of the high pressure filter 20A and the inner peripheral surface and the abutting surface 116 of the small diameter portion 115 in the recess 111A. Therefore, the chips do not flow out to the side of the passage 110 connected to the inner end of the recess 111A, and the chips on the upstream side of the high-pressure filter 20A are captured by the high-pressure filter 20A. So it doesn't matter.

  In addition, since the valve mechanism 19 of the gas pressure reducing valve is accommodated in the body 15A so as to be interposed between the high pressure chamber 37 and the pressure reducing chamber 38 communicating with the passage 110, foreign substances are contained in the high pressure chamber 37 of the gas pressure reducing valve. Intrusion can be reliably prevented by the high-pressure filter 20A, and the sheet mechanism can be surely prevented from being caused by foreign matter biting by the valve mechanism 19, and the gas pressure reducing valve can be downsized.

  A second embodiment of the present invention will be described with reference to FIG. 3. The high-pressure filter 20B is attached to the lower portion of the first body member 17B in the body 15B according to the present invention, and the first body member 17B of the body 15B. Furthermore, a recess 111B having an outer end opened on the lower side surface of the first body member 17B, and a passage 110 communicating with the high pressure chamber 37 (see the first embodiment) and coaxially connected to the inner end of the recess 111B are provided. The high-pressure filter 20B, which is a filter for purifying the compressed natural gas introduced into the passage 110, is fixed to the first body member 17B of the body 15B while being inserted into the recess 111B.

  The concave portion 111B has a tapered portion 127 formed to have a smaller diameter toward the passage 110 side, and an outer end portion of the passage 110 is coaxial with the small diameter end of the tapered portion 127. It is a series. A female screw 128 is engraved on the inner surface of the recess 111B excluding the portion near the taper 127.

  The high-pressure filter 20B integrally includes an annular flange 130 that has an axial end that is an inner end when inserted into the recess 111B as an open end and projects radially outward from the one end. The inlet joint 112B as a flow path forming body that is formed into a bottomed cylindrical shape by the binder and forms a flow path 129 to be connected to the passage 110 and is hermetically attached to the first body member 17B of the body 15B. An attachment cylinder portion 135 is provided as a cylindrical portion that press-fits at least the outer periphery of the high-pressure filter 20B until the one end abuts against the annular flange portion 130 and is coaxially inserted into the recess 111B. An annular chamfered portion 138 is formed on the inner periphery of one end of the portion 135.

  Similarly to the inlet joint 112A of the first embodiment, the inlet joint 112B is in contact with the side surface of the first body member 17B and is formed in a non-circular flat plate shape so that a tool (not shown) can be engaged. A cylindrical mounting tube portion 135 connected to the center of one end surface of the tool engaging portion 134 so that a male screw 132 screwed to the female screw 128 of the concave portion 111B is engraved on the outer periphery. A cylindrical connecting tube portion 136 that is continuous with the central portion of the other end surface of the tool engaging portion 134 and that has an external thread 133 formed on the outer periphery so as to extend to the opposite side of the mounting tube portion 135 is attached. An annular seal member 142 surrounding the cylindrical portion 135 is attached to the first body member 17B so as to be interposed between the central portion of one end of the tool engaging portion 134 and the first body member 17B.

  In addition, an annular abutment surface 137 that abuts against the annular flange 130 is formed at one end of the inlet joint 112B, that is, the inner end of the attachment cylinder 135, and the attachment cylinder 135 is abutted against the annular flange 130. The outer periphery of at least the annular flange 130 side of the high-pressure filter 20B is press-fitted until the contact surface 137 abuts.

  In the second embodiment, the high-pressure filter 20B includes a bottomed cylindrical portion 131 having an axial end that is an inner end when inserted into the recess 111B, and a radial direction from one end of the bottomed cylindrical portion 131. An annular flange 130 projecting outward is formed by sintering metal such as copper, and the contact surface 137 is formed on an end surface of the annular flange 130 facing the contact surface 137. An annular abutting surface 139 for abutting is formed.

  The bottomed cylindrical portion 131 of the high-pressure filter 20B is a large-diameter cylinder whose one end is coaxially connected to the annular flange portion 130 so that a press-fit surface 140 that is press-fitted into the mounting tube portion 135 in the inlet joint 112B is formed on the outer periphery. The portion 131a and a small-diameter cylindrical portion 131b that has a smaller diameter than the large-diameter cylindrical portion 131a and has one end coaxially connected to the other end of the large-diameter cylindrical portion 131a are integrally formed. In this embodiment, it is formed in a tapered shape having a smaller diameter as it is separated from the large diameter cylindrical portion 131a, and the other end of the small diameter cylindrical portion 131b is closed.

  Thus, in the state where the high pressure filter 20B is press-fitted into the inlet joint 112B, the flow path 129 is formed in the inlet joint 112B from the tip of the connecting tube portion 136 to the high pressure filter 20B. An annular channel 141 that constitutes a part of the channel 129 is formed between the inner periphery of the mounting cylinder 135 and the small-diameter cylindrical portion 131b.

  The attachment tube portion 135 is screwed into the recess 111B until the tool engagement portion 134 of the inlet joint 112B into which the high-pressure filter 20B is press-fitted is brought into contact with the side surface of the first body member 17B, and the inlet joint 112B is attached to the first body member 17B. In this state, the annular flange 130 of the high-pressure filter 20B faces the tapered portion 127 at the inner end of the recess 111B, but the high-pressure filter 20B should come out of the inlet joint 112B attached to the first body member 17B. Thus, the distance L1 until it abuts against the tapered portion 127 is set to be smaller than the axial length of the large-diameter cylindrical portion 131a in the high-pressure filter 20B, that is, the press-fit length L2 into the inlet joint 112B of the high-pressure filter 20B.

  When the lengths L1 and L2 are set as described above, the high pressure filter 20B is clogged by trapping foreign matter, and the upstream side of the high pressure filter 20B, that is, the flow path 129 of the inlet joint 112B, and the high pressure filter 20B. If the high-pressure filter 20B starts to come out from the inlet joint 112B to the passage 110 side by any chance, the high-pressure filter 20B is located at the inner end of the recess 111B. Since the high pressure filter 20B does not drop off from the inlet joint 112B because it abuts against the taper portion 127, the press-fitting and holding state of the high pressure filter 20B to the inlet joint 112B is maintained, so that foreign matter is on the passage 110 side, that is, the valve It does not flow to the mechanism 19 side.

  According to the second embodiment, the high-pressure filter 20B made of metal has an axial end that becomes an inner end when inserted into the recess 111B provided in the body 15B as an open end, and radially outward from the one end. The inlet joint 112B is formed in a cylindrical shape with a bottom having an annular flange 130 projecting from the bottom, and is airtightly attached to the body 15B by forming a flow path 129 to be connected to the passage 110 leading to the high pressure chamber 37. In addition, since an attachment cylinder portion 135 is provided to press-fit at least the outer periphery of the high-pressure filter 20B until the one end abuts against the annular flange portion 130 and is coaxially inserted into the recess 111B, the attachment cylinder of the inlet joint 112B is provided. The high pressure filter 20B is fixed to the body 15B by being press-fitted into the portion 135, and the inlet joint 112B that forms the flow path 129 is fixed. No generation of a gap between the fine high-pressure filter 20B, it is possible to reliably capture foreign matter with high pressure filter 20B. In addition, since no other member such as a spring is used to fix the high-pressure filter 20B, it is possible to reduce the space required for fixing the high-pressure filter 20B, thereby reducing costs and reducing the size of the body 15B. This can improve the versatility.

  An annular chamfered portion 138 is formed on the inner periphery of one end of the mounting tube portion 135 in the inlet joint 112B. Chips generated when the high-pressure filter 20B is press-fitted into the mounting tube portion 135 are separated from the chamfered portion 138. It will be sealed between the annular flange 130 of the high-pressure filter 20B and the outer peripheral surface near the annular flange 130, and the chips will not flow out to the side of the passage 110 connected to the inner end of the recess 111B. Further, since the chips on the upstream side of the high-pressure filter 20B are captured by the high-pressure filter 20B, there is no problem.

  In addition, since the high pressure filter 20B is press-fitted into the inlet joint 112B before the inlet joint 112B is fixed to the body 15B, it is easy to check the assembled state of the high pressure filter 20B, and the high pressure filter 20B can be securely attached. Productivity can be increased.

  Further, since the valve mechanism 19 of the gas pressure reducing valve is accommodated in the body 15B so as to be interposed between the high pressure chamber 37 and the pressure reducing chamber 38 communicating with the passage 110, foreign matter enters the high pressure chamber 37 of the gas pressure reducing valve. This can be surely prevented by the high-pressure filter 20B, and the valve mechanism 19 can surely prevent the occurrence of a sheet failure due to the biting of foreign matter, and the gas pressure reducing valve can be downsized.

  Further, the filter 20B includes a large-diameter cylindrical portion 131a whose one end is coaxially connected to the annular flange portion 130 so that a press-fitting surface 140 to be press-fitted into the attachment cylinder portion 135 of the inlet joint 112B is formed on the outer periphery, and the large-diameter cylinder. A small-diameter cylindrical portion 131b, which is smaller in diameter than the portion 131a and has one end coaxially connected to the other end of the large-diameter cylindrical portion 131a, is integrally formed, and the inner circumference of the mounting cylinder portion 135 and the small-diameter cylinder in the inlet joint 112B. Since the annular flow path portion 141 constituting a part of the flow path 129 is formed between the portions 131b, a sufficient flow area of the high-pressure filter 20B can be ensured, and a flow rate can be ensured.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.

  For example, in the first embodiment, the shape of the high-pressure filter 20A is the same as that of the high-pressure filter 20B of the second embodiment. However, the shape is not necessarily limited to the same shape, and may be formed in a bottomed cylindrical shape.

  Further, the present invention is not limited to the high pressure filters 20A and 20B disposed in the body 15A and 15B of the gas pressure reducing valve, and is inserted into a recess that opens the outer end on the side surface of the body. It can be widely implemented in connection with a filter fixed to the body.

It is a longitudinal cross-sectional view of the pressure reducing valve for gas of 1st Example. FIG. 2 is an enlarged view of a portion indicated by an arrow 2 in FIG. 1. It is sectional drawing corresponding to FIG. 2 of 2nd Example.

Explanation of symbols

15A, 15B ... Body 19 ... Valve mechanism 20A, 20B ... Filter 37 ... High pressure chamber 38 ... Decompression chamber 110 ... Passage 111A, 111B ... Recess 112B ... Flow path Inlet joint 116 as a forming body ... Abutting surface 117 ... Abutting surface 118,140 ... Press-fitting surface 119,138 ... Chamfered portion 129 ... Flow path 130 ... Annular flange 131a ... Large-diameter cylindrical part 131b ... Small-diameter cylindrical part 135 ... Mounting cylinder part 141 that is a cylindrical part ... Annular channel part

Claims (5)

  The body (15A) is provided with a recess (111A) having an outer end opened on a side surface of the body (15A) and a passage (110) connected to the inner end of the recess (111A), and the passage (110) In a structure for attaching a filter to a body that is fixed to the body (15A) in a state where a filter (20A) for purifying a fluid introduced into the body (15A) is inserted into the recess (111A), an upstream of the passage (110) A part of the concave portion (111A) is formed on the side, and a flat annular abutment surface (116) faces outward in the axial direction along a plane perpendicular to the axis of the concave portion (111A), and the body (15A The metal filter (20A) is formed in a bottomed cylindrical shape with one axial end serving as an inner end when inserted into the recess (111A) as an open end, and the abutting surface (11 ) Is formed at the one end of the filter (20A), and the press-fitting surface (118) press-fitted into the recess (111A) is at least one axial end of the filter (20A). An annular chamfered portion (119) is formed on the outer periphery of one end of the filter (20A) so as to connect the outer periphery of the contact surface (117) and the press-fitting surface (118). The filter mounting structure to the body characterized by   The valve mechanism (19) of the gas pressure reducing valve is accommodated in the body (15A) so as to be interposed between the high pressure chamber (37) and the pressure reducing chamber (38) communicating with the passage (110). The filter mounting structure to the body according to claim 1.   The body (15B) is provided with a recess (111B) having an outer end opened on a side surface of the body (15B), and a passage (110) connected to the inner end of the recess (111B), and the passage (110) The filter (20B) for purifying the fluid introduced into the body is fixed to the body (15B) in a state where the filter (20B) is inserted into the recess (111B). ) Has an annular flange (130) projecting radially outward from the one end as an open end and an axial end that becomes an inner end when inserted into the recess (111B) into a bottomed cylindrical shape. Formed into a flow path forming body (112B) which is fluidly attached to the body (15B) by forming a flow path (129) to be connected to the passage (110), and the annular flange (130). One end A cylindrical portion (135) is provided which press-fits at least the outer periphery of the filter (20B) until the annular flange portion (130) side and is inserted into the concave portion (111B) coaxially. A structure for attaching a filter to a body, wherein an annular chamfered portion (138) is formed on an inner periphery of one end portion.   A valve mechanism (19) of a gas pressure reducing valve is accommodated in the body (15B) so as to be interposed between the high pressure chamber (37) and the pressure reducing chamber (38) communicating with the passage (110), thereby forming the flow path. 4. The filter mounting structure for a body according to claim 3, wherein the body (112B) is an inlet joint.   One end of the filter (20B) is coaxial with the annular flange (130) so that a press-fitting surface (140) to be press-fitted into the cylindrical part (135) of the flow path forming body (112B) is formed on the outer periphery. A large-diameter cylindrical portion (131a) continuous to the large-diameter cylindrical portion (131a), and a small-diameter cylindrical portion (131b) formed smaller in diameter than the large-diameter cylindrical portion (131a) and having one end coaxially connected to the other end of the large-diameter cylindrical portion (131a). And an annular flow path part constituting a part of the flow path (129) between the inner periphery of the cylindrical part (135) of the flow path forming body (112B) and the small diameter cylindrical part (131b). (141) is formed, The filter attachment structure to the body of Claim 3 or 4 characterized by the above-mentioned.

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