JP4084758B2 - Pressure reducing valve - Google Patents

Description

  The present invention relates to a pressure reducing valve, and in particular, a pressure acting chamber in which a peripheral portion of a diaphragm is sandwiched between valve housings and faces one surface of the diaphragm, and a pressure acting chamber that generates a gas pressure acting on the pressure acting chamber. A valve body that can be seated on a valve seat in which a partition member that partitions the valve is fixed and a valve hole that communicates with the decompression chamber is opened in a central portion penetrates the partition member in an airtight and movably manner and passes through the valve hole. A valve shaft is provided in a valve shaft that is movably inserted and has one end connected to a central portion of the diaphragm, and faces the other surface of the diaphragm. The present invention relates to a pressure reducing valve in which a spring that biases the diaphragm in a direction in which the diaphragm is separated from the housing.

Such a pressure reducing valve is already known from Patent Document 1, for example.
JP 2002-182751 A

  By the way, the partition member is provided in the valve housing in order to perform a function of preventing an excessive load from being applied to the diaphragm even when the gas pressure in the decompression chamber acts on the diaphragm, even if the gas pressure in the decompression chamber greatly fluctuates. However, in the pressure reducing valve disclosed in Patent Document 1, the valve housing includes a body, a thick partition member, and a cover that sandwich the partition member between the body and the cover, and the cover and the partition. The diaphragm is joined so that the peripheral portion of the diaphragm is sandwiched between the members, and the pressure reducing valve is enlarged by the thickness of the thick partition member.

  This invention is made | formed in view of this situation, and it aims at providing the pressure-reduction valve which enabled size reduction.

In order to achieve the above object, the invention according to claim 1 is characterized in that the peripheral portion of the diaphragm is sandwiched between the valve housing and the pressure action chamber that faces one surface of the diaphragm, and the gas pressure that acts on the pressure action chamber. A partition member that partitions between the generated decompression chambers is fixed, and a valve body that can be seated on a valve seat having a valve hole leading to the decompression chamber opened in a central portion penetrates the partition member in an airtight and movably manner. In addition, the valve chamber is provided in a valve shaft that is movably inserted into the valve hole and has one end connected to a central portion of the diaphragm. The spring chamber is formed in the valve housing with the other surface of the diaphragm facing. a reducing valve spring for urging the diaphragm in a direction to unseat the body from the valve seat is accommodated, wherein the valve housing is, Bode having a recess facing the diaphragm surface to the upper When the peripheral portion of the diaphragm so as to sandwich between the body consists of a cover that is coupled to the upper portion of the body, which said partition member is fixed to the fitted to the body in said recess In addition, a filter cover that covers from below the oil filter that allows the gas that has exited the decompression chamber to pass through is detachably attached to the lower surface of the body, and the first gas communicates between the oil filter and the decompression chamber. A passage is formed in the body, and in the filter cover, an oil reservoir chamber is formed around the oil filter to collect oil that has oozed from the oil filter. The outer end of the lateral gas outlet passage formed in a shape is opened, and an opening to the lower surface of the body is provided at the lower end. Vertical second gas passage for communicating between the mouth passage and the oil reservoir chamber is defined in said body at one side of the valve shaft, the said partition wall member sheet steel is formed by press molding, the member is A communication hole that communicates with the pressure acting chamber is provided at a portion that contacts the inner surface of the recess, and the other end of the aspirator passage formed in the body through one end of the communication hole is an inner end of the outlet passage. A straight aspirator tube that opens toward the downstream side in the gas flow direction in the outlet passage is fitted to the other end of the aspirator passage, and a part of the tube Extends along the passage axis into the outlet passage .

  In addition to the configuration of the invention of claim 1, the invention of claim 2 expands the diameter of the diaphragm by restricting the deflection of the diaphragm toward the pressure action chamber by contacting the surface of the diaphragm on the pressure action chamber side. The partition member is fixed to the body with a bolt having a head.

According to a third aspect of the invention, in addition to the configuration of the first or second aspect of the invention, the filter cover is provided with a relief valve that communicates with the oil reservoir chamber .

In addition to the configuration of any one of claims 1 to 3 , the invention of claim 4 communicates with the oil reservoir chamber in the body, and back pressure from the oil reservoir chamber side to the valve shaft. A back pressure hole is formed to act .

According to the present invention, since the partition member formed of a thin plate is fitted into the concave portion of the body and fixed to the body, the partition member is not interposed between the body and the cover. In addition, the partition member can be formed at low cost . Moreover, the gas in the decompression chamber does not directly act on the pressure action chamber, so that the decompression control performance can be improved , and the gas in the aspirator tube and the aspirator passage is drawn by the flow of gas flowing through the outlet passage. Thus, the pressure reduction control performance can be improved by applying a more stable pressure to the pressure action chamber. Further, by storing the oil oozed from the oil filter in the oil reservoir chamber, it is possible to easily prevent the oil from flowing out to the outlet passage side.

In particular , according to the invention of claim 2, the diaphragm member is provided with a portion for restricting the deflection of the diaphragm by restricting the deflection of the diaphragm to the pressure acting chamber side by the enlarged head portion of the bolt. This makes it unnecessary to simplify the shape of the partition member.

In particular, according to the invention of claim 3, the filter cover is provided with a relief valve that communicates with the oil sump chamber, so that it is not necessary to secure a space for the relief valve on the body side of the valve housing. It is possible to reduce the size and eliminate the need to provide a passage that leads to the relief valve in the body, thereby simplifying the shape of the passage in the body and increasing the degree of freedom in arranging the passage.

In particular, according to the invention of claim 4, the body is formed with a back pressure hole that communicates with the oil reservoir chamber and applies back pressure to the valve shaft from the oil reservoir chamber side. Back pressure can be applied to the pressure reducing valve.

  Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

  1 to 11 show an embodiment of the present invention. FIG. 1 is a diagram schematically showing a configuration of a fuel gas supply device. FIG. 2 is a longitudinal sectional view of a gas regulator. FIG. 3 is a cross-sectional view taken along line 2-2, FIG. 3 is a view of the body in a state where the pressure reducing valve is removed, as viewed from the direction of arrows 3-3 in FIG. 2, and FIG. 5 is a view of the body with the oil filter removed from the direction of arrows 5-5 in FIG. 2, FIG. 6 is an enlarged longitudinal sectional view of the electromagnetic shut-off valve, and FIG. 7 is a line 7-7 in FIG. FIG. 8 is an enlarged longitudinal sectional view of a part of the decompression valve shown in FIG. 2, FIG. 9 is a plan view of the partition member, and FIG. 10 is a view of the valve shaft and the diaphragm rod. FIG. 11 is a sectional view taken along line 11-11 in FIG.

  First, in FIG. 1, compressed natural gas (Compressed Natural Gas: hereinafter referred to as CNG), which is a fuel gas, is stored in one or a plurality of CNG tanks 20 at a high pressure of, for example, 25 to 1 MPa, and these CNG tanks. The container shut-off valves 21... Respectively included in the 20 ... are connected in common to the filling port 22 via the check valve 23 and commonly connected to the manual shut-off valve 24. A pressure sensor 26 and a temperature sensor 27 are attached to the pipe line 25 between 24.

  CNG from the CNG tank 20 when the container shut-off valve 21 and the manual shut-off valve 24 are opened is an oil filter for removing oil that may be mixed when the CNG tank 20 is filled with CNG by the compressor. CNG, which is led to the gas regulator R through the high-pressure line 28 including 41 and decompressed to 0.2 to 0.3 MPa, for example, by the gas regulator R, passes through the line 30 to the injector 29 of the engine E. The pipe 30 is provided with a temperature sensor 31 and a pressure sensor 32.

The gas regulator R is provided with a high pressure filter 35, an electromagnetic shut-off valve 36, a pressure reducing valve 37, an oil filter 38, and a thermostat 40 in a body 34 having a hot water passage 33, and is detachable from the lower surface of the body 34. A relief valve 39 is disposed on the filter cover 42 to be attached.

  The high-pressure filter 35 removes impurities contained in CNG guided from the manual shut-off valve 24 via the high-pressure line 28. The pressure reducing valve 37 operates so as to reduce the pressure of CNG of 25 to 1 MPa from which impurities have been removed by the high pressure filter 35 to, for example, 0.2 to 0.3 MPa, and the electromagnetic cutoff valve 36 operates the engine E. Along with the stop, the high pressure filter 35 and the pressure reducing valve 37 are shut off to stop the supply of CNG.

  Engine cooling water is introduced from the engine E into the hot water passage 33 of the body 34 so that the temperature of the body 34 does not drop too much due to the pressure reducing action of the pressure reducing valve 37. A thermostat 40 is attached to the body 34 on the return side of the engine cooling water from the engine 33 to the engine E side. The thermostat 40 is closed when the engine cooling water flowing through the hot water passage 33 exceeds 80 ° C., for example. This prevents the temperature of the body 34 from rising too much.

  2 to 5, the body 34 has first and second side surfaces 44 and 45 formed as flat surfaces facing each other and parallel to each other, and the first and second side surfaces. The high pressure filter 35 is attached to the body 34 from the first side surface 44 side, and the electromagnetic shut-off valve 36 is the third side surface. Mounted on the body 34 from the 46 side. Further, a connecting pipe 48 for guiding engine cooling water from the engine E to a hot water passage 33 provided in the body 34 is attached to the first side face 44, and a housing 49 of the thermostat 40 is attached to the second side face 45. The screw is engaged so as to communicate with the outlet side of the hot water passage 33.

  With particular attention to FIG. 4, the first side surface 44 of the body 34 is provided with a recess 53, and a pipe joint 54 is formed between the inner end and the body 34 in the outer end opening of the recess 53. The high-pressure line 28 that guides CNG from the manual shut-off valve 24 is connected to the outer end portion of the pipe joint 54. A high pressure filter 35 is fitted in the recess 53 so as to be spaced from the inner end of the pipe joint 54, and the high pressure filter 35 is interposed between the high pressure filter 35 and the pipe joint 54. A spring 56 is provided that exerts a resilient force that presses against the inner end blocking portion of the recess 53.

  An annular unpurified chamber 57 communicating with the pipe joint 54 is formed between the outer periphery of the high pressure filter 35 fitted in the recess 53 and the body 34, and the body 34 purifies the inside of the high pressure filter 35. An entrance passage 59 leading to the chamber 58 is provided. Thus, the CNG guided through the high-pressure line 28 passes through the high-pressure filter 35 from the unpurified chamber 57 and flows into the purification chamber 58, and the CNG from which impurities have been removed is guided to the inlet passage 59. It is burned.

  Referring also to FIG. 6, an electromagnetic shut-off valve 36 is mounted on the third side surface 46 of the body 34 at a position corresponding to the high pressure filter 35.

  The electromagnetic shut-off valve 36 includes a coil assembly 60, a guide cylinder 61 made of a non-magnetic material whose one end is inserted into the coil assembly 60 and the other end is fixed to the body 34, and one end of the guide cylinder 61. A fixed core 62 fixed to the guide cylinder 61 so as to cover the plunger, a plunger 63 slidably fitted into the guide cylinder 61 so as to face the fixed core 62, and provided between the fixed core 62 and the plunger 63. The return spring 64, the magnetic metal solenoid housing 65 fastened to the fixed core 62 so as to cover the coil assembly 60, and the coil assembly 60 being screwed into the body 34 so as to be sandwiched between the solenoid housing 65. And a valve member 67 held by the plunger 63 on the opposite side of the fixed core 62.

  The coil assembly 60 is formed by covering a bobbin 68 made of synthetic resin and a coil 69 wound around the bobbin 68 with a covering portion 70 made of synthetic resin. In the portion, a coupler part 70a facing the pair of connection terminals 71 connected to the coil 69 is integrally provided so as to protrude outward, and is not shown in the connection terminals 71 of the coupler part 70a. Conductor is connected.

  The third side surface 46 of the body 34 has a small-diameter hole 73 whose inner end is closed, and a large-diameter hole 74 that is larger in diameter than the small-diameter hole 73 and that is coaxially connected to the outer end of the small-diameter hole 73. An annular step 75 is provided between each other. On the outer surface of the other end side of the guide tube 61 that is inserted into the bobbin 59 at one end side, a flange portion 61a that makes the outer peripheral surface approach and face the inner surface of the large diameter hole 74 is integrally provided so as to project outward in the radial direction. The other end portion of the guide tube 61 is inserted into the large-diameter hole 74 so that the annular seal member 76 is sandwiched between the flange portion 61 a and the step portion 75.

  The magnetic support frame 66 is assembled to the body 34 by being screwed into the large diameter hole 74. Moreover, the guide cylinder 61 is also fixed to the body 34 by sandwiching the seal member 76 and the flange 61a between the stepped portion 75 and the magnetic support frame 66.

  A screw shaft portion 62 a penetrating through the central portion of the closed end of the solenoid housing 65 formed in a bottomed cylindrical shape is integrally connected to the fixed core 62, and the protruding portion from the solenoid housing 65 of the screw shaft portion 62 a A cap nut 78 is screwed with a washer 77 interposed between the solenoid housing 65 and the central portion of the closed end of the solenoid housing 65 is fastened to the fixed core 62 by tightening the cap nut 78. Become.

  The other end side of the guide cylinder 61 is fixed to the body 34 in a state of being inserted into the large diameter hole 74, and the plunger 63 is slidably fitted to the guide cylinder 61, so that the inside of the small diameter hole 73 provided in the body 34 is reduced. A main valve chamber 79 is formed between the end portion and the other ends of the guide cylinder 61 and the plunger 63. In addition, an inlet passage 59 that leads to the purification chamber 58 of the high-pressure filter 35 communicates with the main valve chamber 79, and CNG from which impurities have been removed by the high-pressure filter 35 is introduced into the main valve chamber 79.

  Further, a passage 80 is provided in the body 34 so as to open at the center of the inner end portion of the small diameter hole 73, and the main valve chamber 79 side so as to surround the opening end of the passage 80 to the main valve chamber 79. An annular valve seat 81 that slightly protrudes from the body 34 is provided on the body 34.

  The valve member 67 has a tapered surface with a small diameter toward the plunger 63 side at one end surface and is formed in a disk shape so as to face the pilot valve portion 67a on one end side and the inner end portion of the small diameter hole 73. The main valve portion 67b on the other end side formed in the shape of the pilot valve portion is integrally connected via a connecting cylinder portion 67c forming a step between the valve portions 67a and 67b. The diameter of 67a is set smaller than the diameter of the main valve portion 67b. A central portion of the valve member 67 is provided with a first passage 82 that always communicates with the passage 80 and a second passage 83 that communicates with the first passage 82 and opens at the center of one end surface of the pilot valve portion 67a. The second passage 83 is formed with a smaller diameter than the first passage 82.

  A concave portion 84 into which the pilot valve portion 67 a is inserted is provided at the end facing the main valve chamber 79 in the plunger 63, and the pilot valve portion 67 a is a C-shaped retaining ring 85 fixed to the other end of the plunger 63. Thus, a pilot valve chamber 86 is formed between the pilot valve portion 67 a and the plunger 63 so as to be prevented from being detached from the recess 84, and communicates with the main valve chamber 79. In addition, a rubber seal 87 is embedded in the central portion of the closed end of the recess 84 to block the opening of the second passage 83 to the pilot valve chamber 86 when the central portion of the one end surface of the pilot valve portion 67a is seated. Thus, the retaining ring 85 is fixed to the plunger 63 at a position where the pilot valve portion 67 a can move relative to the plunger 63 between the closed end of the recess 84 and the retaining ring 85.

  An annular rubber seal 88 is embedded in the surface of the main valve portion 67b facing the closed end of the small diameter hole 73 so as to be seated on the valve seat 81 and shut off between the main valve chamber 79 and the passage 80.

  In such an electromagnetic shut-off valve 36, the power supply to the coil 60 is cut off, so that the plunger 63 moves away from the fixed core 62 by the spring force of the return spring 64, and the rubber seal 88 of the main valve portion 67b is moved. The main valve chamber 79 and the passage 80 are blocked by being seated on the valve seat 81, and the pilot valve portion 67a is also seated on the rubber seal 87 and the pilot valve chamber 86 and the passage 80 are also blocked. Supply to the side is stopped.

  On the other hand, when electric power is supplied to the coil 60, the plunger 63 first moves to the fixed core 62 side so as to separate the pilot valve portion 67 a from the rubber seal 87, and communicates with the passage 80 through the first passage 82. The two passages 83 communicate with the pilot valve chamber 86. As a result, CNG gradually flows from the main valve chamber 79 to the passage 80 through the pilot valve chamber 86, the second passage 83, and the first passage 82, whereby the main valve chamber 79 and the passage 80 enter the main valve portion 67b. The difference in pressure acting from the side is reduced. Thus, when the electromagnetic force by the coil 60 overcomes the differential pressure acting on the main valve portion 67b, the plunger 63 further moves to the fixed core 62 side, and the rubber seal 88 of the main valve portion 67b moves to the valve seat 81. The CNG flows away from the main valve chamber 79 to the passage 80.

  7 and 8 together, the valve housing 90 of the pressure reducing valve 37 includes a body 34 and a cover 91 fastened to the upper surface 34a of the body 34 by a plurality of bolts 92. The peripheral edge of the diaphragm 93 is sandwiched between the upper surface 34a of the body 34 and the cover 91 having the cylindrical part 91a.

  A concave portion 94 is provided on the upper surface 34 a of the body 34, and a partition wall member 96 fitted to the concave portion 94 is fixed to the body 34, and an upper end is opened at the central portion of the closed end of the concave portion 94. A mounting hole 95 extending downward is provided. The attachment hole 95 includes a large-diameter hole portion 95a having an upper end opened at the central portion of the closed end of the recess 94, and a screw hole having a smaller diameter than the large-diameter hole portion 95a and having an upper end coaxially connected to the lower end of the large-diameter hole portion 95a. A portion 95b having a diameter smaller than that of the screw hole portion 95b, a medium diameter hole portion 95c having an upper end coaxially connected to the lower end of the screw hole portion 95b, and a diameter smaller than that of the medium diameter hole portion 95c. A small diameter hole portion 95d having an upper end coaxially connected thereto, and a passage 80 for guiding CNG from the electromagnetic shut-off valve 36 is opened on the inner surface of the medium diameter hole portion 95c.

  Referring also to FIG. 9, the partition member 96 includes an annular flat plate portion 96 a that faces the closed end of the concave portion 94, and a short cylindrical portion 96 b that is continuous with the outer periphery of the annular flat plate portion 96 a and is fitted in the concave portion 94. And a cylindrical guide tube portion 96c that is connected to the inner periphery of the annular flat plate portion 96a and extends to the opposite side of the short cylindrical portion 96b, and is formed by press-forming a thin steel plate. .

  A plurality of, for example, three insertion holes 97... Are provided at equal intervals in the circumferential direction at positions surrounding the guide tube portion 96 c, and bolts 98 that are inserted through these insertion holes 97. The partition wall member 96 is fixed to the body 34 by being screwed onto and tightened. Moreover, an annular seal member 99 surrounding each bolt 98 is attached to the closed end of the recess 94 so as to elastically contact the annular flat plate portion 96a of the partition wall member 96.

  A cylindrical valve seat member 100 is screwed into the screw hole portion 95 b of the attachment hole 95 so as to form a decompression chamber 101 with the partition wall member 96, and is attached to the outer periphery of the valve seat member 100. An annular seal member 102 that elastically contacts the entire inner surface of the medium-diameter hole 95c above the opening end of the passage 80 that guides CNG from the electromagnetic shut-off valve 36 is mounted.

  On the end face of the valve seat member 100 on the decompression chamber 101 side, a plurality of, for example, four grooves 103,. Two protrusions 104 are projected, and the grooves 103 are arranged in a cross shape. Thus, when the valve seat member 100 is screwed into the screw hole portion 95b, it is possible to rotate the valve seat member 100 by engaging a tool (not shown) with the grooves 103 arranged in a cross shape. The valve seat member 100 can be easily attached to the body 34.

  A cylindrical guide member 106 having a guide hole 105 coaxial with the mounting hole 95 is press-fitted into an end portion of the valve seat member 100 opposite to the projections 104, that is, a lower end portion of the valve seat member 100. The guide member 106 is fitted into the small diameter hole portion 95 d of the attachment hole 95. Thus, an annular chamber 107 communicating with the passage 80 is formed between the outer periphery of the valve seat member 100 and the guide member 106 which are coupled to each other by press-fitting and the inner surface of the medium diameter hole portion 95c in the mounting hole 95. Is done.

  A valve chamber 108 is formed between the valve seat member 100 and the guide member 106, and a plurality of communication holes 109... For allowing the valve chamber 108 to communicate with the annular chamber 107 are provided in the side wall of the valve seat member 100.

  Further, a valve hole 111 communicating with the decompression chamber 101 is formed at an end portion of the valve seat member 100 on the decompression chamber 101 side, and a tapered valve seat 112 facing the valve chamber 108 with the valve hole 111 opened at the central portion. The valve seat member 100 is formed.

  A valve body 113 made of synthetic resin that can be seated on the valve seat 112 is accommodated in the valve chamber 108, and the valve body 113 is coaxially inserted into the valve hole 111 so that one end protrudes toward the decompression chamber 101 side. The valve shaft 114 is fixed to an intermediate portion.

  The valve body 113 is formed in a cylindrical shape with one end surface facing the valve seat 112 being tapered so as to be seated on the valve seat 112 having a tapered shape, and the valve shaft 114 is elastically formed on the valve body 113. By being fitted to each other, the valve shaft 114 is fixed. Moreover, an O-ring 115 that elastically contacts the inner surface of the valve body 113 is attached to the outer surface of the valve shaft 114.

  The other end of the valve shaft 114 is slidably fitted into the guide hole 105 so as to be in sliding contact with the O-ring 116 interposed between the inner surface of the guide hole 105. A holding plate 117 for holding the O-ring 116 is in contact with the end surface of the guide member 106 on the valve chamber 108 side on the inner periphery of the guide hole 105, and between the holding plate 117 and the valve body 113, A spring 118 is provided that exerts a spring force in a direction in which the valve body 113 is seated on the valve seat 112.

  Thus, the valve seat member 100, the guide member 106, the valve body 113, the valve shaft 114, and the spring 118 are assembled in advance to constitute the valve operating unit 120, and the valve operating unit 120 is formed on the upper surface 34a. It will be attached to the body 34 from the side.

  The diaphragm 93 is supported by the valve housing 90 so as to form a pressure acting chamber 121 between the diaphragm member 96 and the cover 91, and the partition member 96. Separates the decompression chamber 101 and the pressure action chamber 121. In addition, the deflection of the diaphragm 93 toward the pressure acting chamber 121 is restricted by abutting against the enlarged diameter heads 98 a of a plurality of bolts 98 that fasten the partition member 96 to the body 34. The spring chamber 122 in the cover 91 houses a coil spring 123 that urges the diaphragm 93 toward the decompression chamber 101.

  A housing hole 124 extending coaxially with the valve hole 111 is provided in the cylindrical portion 91a of the cover 91 so as to open an outer end, and the housing hole 124 is a screw hole portion 124a on the axially outer side. And an axially inward sliding hole 124b having a larger diameter than the screw hole 124a and coaxially connected to the screw hole 124a.

  A first diaphragm retainer 125 that integrally has a cylindrical portion 125a that penetrates the central portion of the diaphragm 93 and protrudes toward the spring chamber 122 is brought into contact with the surface facing the decompression chamber 101 side of the central portion of the diaphragm 93. The central portion of the diaphragm 93 is engaged with the annular step portion 126 provided on the outer surface of the cylindrical portion 125 a on the surface facing the spring chamber 122 side of the central portion of the diaphragm 93, so that the central portion of the diaphragm 93 is between the first diaphragm retainer 125. A second diaphragm retainer 127 to be sandwiched is brought into contact.

  A diaphragm rod 128 is connected to one end portion of the valve shaft 114, that is, the end portion on the diaphragm 93 side, and this diaphragm rod 128 is inserted into the central portion of the first diaphragm retainer 125 from the decompression chamber 101 side. An annular step portion 129 facing the decompression chamber 101 side is provided on the inner surface of the cylindrical portion 125 a of the first diaphragm retainer 125, and the diaphragm rod 128 is engaged with the annular step portion 129. The second diaphragm retainer 127 is sandwiched between the diaphragm 93 and the auxiliary retainer 130, and a screw shaft portion 128 a provided on the diaphragm rod 128 at a protruding portion from the cylindrical portion 125 a is interposed between the auxiliary retainer 130 and the screw shaft portion 128 a. A nut 132 with washers 131... Is screwed in, and by tightening the nut 132, the central portion of the diaphragm 93 is sandwiched between the two diaphragm retainers 125 and 127, and the valve shaft 114 is connected to the central portion of the diaphragm 93. Will be. Moreover, in order to seal between the decompression chamber 101 and the spring chamber 122, an O-ring 134 mounted on the outer periphery of the diaphragm rod 128 elastically contacts the inner surface of the cylindrical portion 125a.

  10 and 11, the valve shaft 114 is provided with an enormous portion 114a having a spherical tip at one end, and a fitting recess 135 is provided coaxially at the end of the diaphragm rod 128 on the valve shaft 114 side. The closed end of the fitting recess 135 is formed as a tapered surface 135a. Thus, the enormous portion 114a is fitted to the fitting recess 135 so as to be able to swing, with its tip abutting against the closed end of the fitting recess 135.

  In addition, the diaphragm rod 128 is provided with a slit 136 extending along a plane orthogonal to the axis thereof so as to cross the fitting recess 135, and a clip member 137 formed in a substantially U shape is formed in the fitting recess 135. The valve seat 114 is inserted into the slit 136 in a detachable manner so as to be engaged with the enormous portion 114a of the valve shaft 114 fitted with one end thereof from the valve seat member 100 side.

  In addition, the diaphragm rod 128 is inserted into the cylindrical portion 125 a of the first diaphragm retainer 125, so that the clip member 137 is prevented from being detached from the diaphragm rod 128, and one end portion of the valve shaft 114 is swung to the diaphragm rod 128. The connected state is maintained.

  An adjustment screw 138 having a bottomed cylindrical shape is screwed into the outer end opening of the storage hole 124, that is, the screw hole 124 a so that the adjustment screw 138 can advance and retreat, and the outer periphery of the adjustment screw 138 is slid in the storage hole 124. An O-ring 144 that elastically contacts the entire inner periphery of the moving hole portion 124b0 is attached. An engagement recess 139 for engaging a tool for adjusting the advance / retreat position of the adjustment screw 138 is provided on the outer surface of the closed end of the adjustment screw 138.

  A protrusion 138a protrudes from the inner surface of the central portion of the closed end of the adjusting screw 138. The retainer 140 is fitted and held in the protrusion 138a, and the auxiliary retainer is attached to the diaphragm 93 on the spring chamber 122 side. The coil spring 123 is contracted between the leaf spring 141 and the leaf spring 141 that is in contact with 130. Therefore, the spring load of the coil spring 123 can be adjusted by adjusting the advance / retreat position of the adjustment screw 138.

  The leaf spring 141 is for applying sliding resistance to the diaphragm 93 by frictional contact with the inner surface of the cylindrical portion 91a of the cover 91, and is attached to the central portion of the diaphragm 93 on the spring chamber 122 side. A bottomed cylindrical cup portion 141a having a closed end sandwiched between the auxiliary retainer 130 and the coil spring 123, and a plurality of, for example, eight locations at equal intervals in the circumferential direction of the inner surface of the sliding hole 124b in the cylindrical portion 91a. It is composed of a plurality of leaf portions 141b, 141b,... Integrally connected to the open end of the cup portion 141a so as to be slidably contacted.

  A negative pressure passage 142 communicating with the spring chamber 122 is provided at the base of the cylindrical portion 91a of the cover 91, and a connection pipe 143 communicating with the negative pressure passage 142 is attached to the cover 91 by press fitting or the like. Thus, the connection pipe 143 is connected to the engine E, and the intake air negative pressure of the engine E is introduced into the spring chamber 122.

  In such a pressure reducing valve 37, in a state where high pressure CNG does not flow into the valve chamber 108, the diaphragm 93 is bent toward the pressure reducing chamber 101 by the spring force of the coil spring 123, and the valve body 113 is moved from the valve seat 112. The valve hole 111 is opened away. Thus, the high-pressure CNG flowing into the valve chamber 108 flows into the decompression chamber 101 side from the valve hole 111, and the pressure in the decompression chamber 101 moves the diaphragm 93 toward the spring chamber 122 against the spring force of the coil spring 123. When increased to such an extent that the valve body 113 is bent, the valve body 113 is seated on the valve seat 112 and the valve hole 111 is closed. By repeating such opening and closing of the valve hole 111, for example, CNG that has flowed in at a high pressure of 25 to 1 MPa is decompressed to, for example, 0.2 to 0.3 MPa in the decompression chamber 101.

  In FIG. 2 again, a filter cover 42 is detachably attached to a lower surface 34b which is a surface opposite to the upper surface 34a of the body 34, which is the side where the pressure reducing valve 37 is attached to the body 34. The filter cover 42 has a flange portion 42a on the open end side and is formed in a bottomed cylindrical shape. The plurality of flange portions 42a, for example, four bolts 146. An annular seal member 147 that elastically contacts the open end of the filter cover 42 is attached to the lower surface 34b of the body 34.

  An oil filter 38 disposed at a position offset from the axis of the pressure reducing valve 37 and having an axis parallel to the axis of the pressure reducing valve 37 is attached to the body 34 so as to be sandwiched between the filter cover 42 and the body 34. .

  A mounting recess 148 into which one end of the oil filter 38 is inserted is provided on the lower surface 34b of the body 34. On the other hand, the portion corresponding to the oil filter 38 on the inner surface of the large-diameter hole 95a in the mounting hole 95 provided in the body 34 to attach the valve operating unit 120 of the pressure reducing valve 37 is on the closed end side of the recess 94. A communication recess 149 that opens to the decompression chamber 101 is formed so as to become narrower toward the outside in the radial direction of the mounting hole 95. The leading end of the connecting recess 149 is disposed inward of the seal member 99 attached to the closed end of the recess 94, and the opening of the connecting recess 149 to the closed end of the recess 94 is a partition wall. The member 96 is closed.

The body 34, the first gas passage 150 that allowed to open the upper end to the distal end portion of the contact recess 149, via a contact recess 148 disposed so as to communicate the vacuum chamber 101, the first gas passage 150, the lower It is formed so as to incline toward the side away from the pressure reducing valve 37 as it goes to. Further, a connection hole 151 that extends vertically through the lower end of the first gas passage 150 is provided in the body 34 such that the lower end thereof opens to the central portion of the closed end of the mounting recess 148.

  The oil filter 38 is formed by providing a mesh portion 153 that allows a gas flow in a part of a side wall of a cylindrical filter case 152 made of synthetic resin, and one end thereof is elastically fitted into the connection hole 151. An elastic member 154 that integrally includes a cylindrical portion 154a to be clamped and a flange portion 154b projecting outward from an intermediate portion of the cylindrical portion 154a so as to be sandwiched between one end portion of the filter case 152 and the closed end of the mounting recess 148. By fitting the lower part of the cylindrical part 154 a to the upper part of the filter case 152 so that the part 154 a is communicated with the filter case 152, the cylindrical part 154 a is attached to one end part of the filter case 152.

  Thus, the filter cover 42 is detachably attached to the lower surface 34 b of the body 34 so as to cover the protruding portion of the oil filter 38 from the lower surface 34 b of the body 34, and the oil filter 38 is installed in the filter cover 42. Is formed with an oil reservoir chamber 156 for collecting oil that has exuded from the mesh portion 153 of the oil filter 38.

  A drain hole 157 is provided at the bottom of the filter cover 42 at a portion corresponding to the oil filter 38, and an annular seal member 158 is interposed between the lower surface of the filter cover 42 and screwed into the drain hole 157. The drain hole 157 is liquid-tightly closed by the drain bolt 159 to be joined, and the lower end of the filter case 152 in the oil filter 38 comes into contact with the inner end of the drain bolt 159. That is, the oil filter 38 is sandwiched between the drain bolt 159 screwed into the filter cover 42 and the body 34. Moreover, the drain hole 157 is formed to have an inner diameter that allows the oil filter 38 to be inserted and removed, and the oil filter 38 can be replaced by attaching and detaching the drain bolt 159.

  Further, a back pressure hole 160 that allows the lower end portion to communicate with the oil reservoir chamber 156 is provided on the lower surface 34 b of the body 34 so as to be coaxial with the mounting hole 95 provided in the body 34 for mounting the valve operating unit 120 of the pressure reducing valve 37. The upper end of the back pressure hole 160 communicates coaxially with the guide hole 105 of the guide member 106. In addition, an annular seal member 161 surrounding the back pressure hole 160 is attached to the lower end of the guide member 106 so as to elastically contact the body 34, and an oil reservoir chamber is provided on the valve shaft 114 of the pressure reducing valve 37. The back pressure from 156 will act.

An outer end of an outlet passage 164 provided in the body 34 is opened on the second side surface 45 of the body 34 so as to extend in parallel with the inlet passage 59 above the oil reservoir chamber 156. A second gas passage 165 extending vertically through the inner end through the upper end is provided in the body 34 with its lower end opened to the upper end of the oil reservoir chamber 156. That is, the upper portion of the oil reservoir chamber 156 communicates with the outlet passage 164 via the second gas passage 165.

  By the way, in the annular flat plate portion 96a of the partition wall member 96 that separates the pressure acting chamber 121 that faces one surface of the diaphragm 93 in the pressure reducing valve 37 and the pressure reducing chamber 101 that generates the gas pressure acting on the pressure acting chamber 121, A communication hole 166 that communicates with the pressure action chamber 121 is provided in a portion that is inward of the annular sealing member 99 interposed between the annular flat plate portion 96a and the body 34 and that abuts against the closed end of the recess 94. The other end of the aspirator passage 167 provided in the body 34 through one end of the communication hole 166 is communicated with the outlet passage 164.

Moreover, an aspirator tube 168 that opens toward the downstream side in the gas flow direction in the outlet passage 164 is attached to the body 34 with a part thereof being disposed in the outlet passage 164 along the passage axis. The other end of the aspirator passage 167 is connected to the aspirator tube 168.

  The relief valve 39 is attached to the side of the filter cover 42 on the side corresponding to the second side surface 45 of the body 34, and has a valve hole 169 leading to the oil reservoir chamber 156 at the tip, and the side of the filter cover 42. A valve body 172 having a rubber seal 171 at the front end capable of closing the valve hole 169 and a valve body 172 in a direction to close the valve hole 169 with the rubber seal 171 are spring-biased in a valve housing 170 that is airtightly screwed into the valve housing 170. The valve housing 170 and the valve body 172 are formed so that the CNG from the oil reservoir chamber 156 can be opened to the outside when the valve hole 169 is opened.

  Next, the operation of this embodiment will be described. The valve housing 90 of the pressure reducing valve 37 in the gas regulator R includes a body 34 provided with a recess 94 facing the diaphragm 93 side, and the peripheral edge of the diaphragm 93 between the body 34 and the body 34. And a cover 91 coupled to the body 34 so as to be sandwiched between the pressure action chamber 121 that faces one surface of the diaphragm 93 and the decompression chamber 101 that generates pressure acting on the pressure action chamber 121. The partition member 96 is formed by press-forming a thin steel plate, and the partition member 96 fitted in the recess 94 is fixed to the body 34.

  Therefore, the partition member 96 is not interposed between the body 34 and the cover 91, the pressure reducing valve 37 can be downsized, and the partition member 96 can be formed at low cost.

  The partition member 96 is in contact with the surface of the diaphragm 93 on the side of the pressure action chamber 121, and thereby the body 34 is a bolt 98 having an enlarged head portion 98a that restricts the deflection of the diaphragm 93 toward the pressure action chamber 121. Therefore, it is not necessary to provide the partition member 96 with a portion for restricting the bending of the diaphragm 93, and the shape of the partition member 96 can be simplified.

  By the way, the partition member 96 is provided with a communication hole 166 that communicates with the pressure action chamber 121 at a portion that contacts the inner surface of the recess 94, and the body 34 is provided with an outlet passage 164 that communicates with the decompression chamber 101. Since the other end of the aspirator passage 167 provided in the body 34 through one end communicates with the outlet passage 164, the pressure in the pressure reducing valve 37 is reduced so that the gas in the pressure reducing chamber 101 does not directly act on the pressure acting chamber 121. Control performance can be improved.

  Moreover, since the other end of the aspirator passage 167 is connected to the aspirator tube 168 that opens toward the downstream side in the gas flow direction in the outlet passage 164 and is attached to the body 34, the flow of gas flowing through the outlet passage 164 As a result, the gas in the aspirator tube 168 and the aspirator passage 167 is drawn, and a more stable pressure can be applied to the pressure action chamber 121 to improve the pressure reduction control performance.

  Further, in the pressure reducing valve 37, a valve seat member 100 provided with a valve hole 111 and a valve seat 112, a guide member 106 having a guide hole 105 and press-fitted into the valve seat member 100, and a valve seatable on the valve seat 112 The valve shaft 114 provided with the body 113, the spring 118, and the like are assembled in advance to form the valve operating unit 120. The valve operating unit 120 projects one end of the valve shaft 114 from the valve hole 111 and the guide hole 105. Since the other end of the valve shaft 114 is slidably fitted to the body 34, the valve shaft 114 is attached to the body 34 from the upper surface 34a side. It is easy to improve the coaxial accuracy between the guide hole 105 of the member 106 and the valve seat 112 of the valve seat member 100, and avoid high processing accuracy in a portion that increases the cost. While reducing the cost and improving the coaxial accuracy, the assemblability can be improved, and the valve operation unit 120 alone can be easily hermetically sealed and the performance can be confirmed, thereby improving the yield. .

  In addition, one end portion of the valve shaft 114 is detachably connected to the diaphragm rod 128 held through the first and second diaphragm retainers 125 and 127 at the center of the diaphragm 93. The valve shaft of the diaphragm rod 128 is The end portion on the 114 side is provided with a fitting recess 135 that coaxially engages the enormous portion 114a provided at one end of the valve shaft so as to be able to swing, and the clip that engages the enormous portion 114a from the valve seat member 100 side. The member 137 is removably inserted into a slit 136 provided in the diaphragm rod 128 along a plane orthogonal to the axis of the diaphragm rod 128.

  As a result, the valve shaft 114 can be pivotably connected to the diaphragm rod 128, so that even if the axis of the diaphragm rod 128 and the axis of the valve seat 112 and the guide hole 105 are deviated, the guide hole 105 and the valve seat It is possible to connect the valve shaft 114 to the diaphragm rod 128 while maintaining the axis of the valve 112, improving the seat performance when the valve body 113 is seated on the valve seat 112, and the diaphragm 93 by tilting the valve shaft 114. Can be prevented from being deflected and the pressure reduction controllability can be improved.

  Moreover, when the valve shaft 114 and the diaphragm rod 128 are connected by screwing, there is a possibility that the assembling property is lowered and the reliability is lowered due to the generation of chips, but the slit 136 of the diaphragm rod 128 is Since the inserted clip member 137 is merely engaged with the enlarged portion 114a at one end of the valve shaft 114, the assembling property and the reliability can be improved.

  Further, in the gas regulator R, the body 34 is provided with at least an electromagnetic cutoff valve 36 and a pressure reducing valve 37. In this embodiment, in addition to the electromagnetic cutoff valve 36 and the pressure reducing valve 37, the high pressure filter 35 and the thermostat 40 include the body 34. However, since the oil filter 38 interposed between the pressure reducing valve 37 and the outlet passage 164 is attached to the body 34, at least the electromagnetic shut-off valve 36, the pressure reducing valve 37 and the oil filter 38 are attached to the body 34. By integrating, the gas decompression system can be simplified and the cost can be reduced.

  A mounting recess 148 is provided in the body 34 corresponding to the oil filter 38, and the oil filter 38, one end of which is inserted into the mounting recess 148, covers the protruding portion of the oil filter 38 from the body 34. Since the filter cover 42 is detachably mounted between the body 34 and the body 34, the oil filter 38 can be easily mounted, and the capacity of the oil filter 38 can be set as large as possible while reducing the size of the body 34. .

The oil filter 38 is formed by providing a mesh portion 153 that allows gas flow in a part of the side wall of a cylindrical filter case 152 made of synthetic resin, and guides the gas decompressed by the decompression valve 37. A connection hole 151 that opens to the closed end of the mounting recess 148 so as to communicate with the first gas passage 150 provided in the body 34 is provided in the body 34, and a cylinder in which one end is elastically fitted into the connection hole 151. An elastic member 154 that integrally includes a flange portion 154b that protrudes outward from the cylindrical portion 154a so as to be sandwiched between one end portion of the portion 154a and the filter case 152 and the closed end of the mounting recess 148, and the cylindrical portion 154a as a filter case The filter case 152 is attached to one end of the filter case 152 so as to communicate with the oil filter 152, and the oil filter is installed in the filter cover 42. Around 8, the oil reservoir chamber 156 for storing the exuded oil from the mesh portion 153 of the oil filter 38 is formed so as to make through its upper end to the outlet passage 164.

  Therefore, the oil filter 38 connected to the downstream side of the pressure reducing valve 37 can be attached to the body 34 in an airtight and reliable manner, and can be easily removed, and the oil that has oozed from the oil filter 38 is removed from the oil reservoir chamber 156. It is possible to easily prevent oil from flowing out to the outlet passage 164 side.

  By the way, a drain hole 157 that is liquid-tightly closed by a drain bolt 159 is provided at the bottom of the filter cover 42, and the oil accumulated in the oil reservoir chamber 156 at the time of inspection can be easily removed by attaching and detaching the drain bolt 159. And maintainability can be improved.

  In addition, a relief valve 39 is attached to the filter cover 42, so that the body 34 can be downsized so as not to secure a space for the relief valve 39 on the side of the body 34, and a passage leading to the relief valve 39 is provided. Since it is not necessary to provide the body 34, the shape of the passage in the body 34 can be simplified and the degree of freedom in the passage arrangement can be increased.

  Further, while the filter cover 42 is attached to the lower surface 34 b of the body 34, the valve operating unit 120 that is a part of the pressure reducing valve 37 is attached to the body 34 from the upper surface 34 a side of the body 34, and back pressure is applied to the pressure reducing valve 37. Since the back pressure hole 160 to be acted is provided in the body 34 through the oil reservoir chamber 156, the assembly direction of the pressure reducing valve 37 is reversed from the mounting direction of the filter cover 42 to the body 34. It is possible to improve the performance, simplify the passage-shaped body 34 leading to the pressure reducing valve 37, and apply a back pressure to the pressure reducing valve 37 with a simple configuration.

  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.

It is a figure which shows schematically the structure of a fuel gas supply apparatus. It is a longitudinal cross-sectional view of the regulator for gas, Comprising: It is sectional drawing which follows the 2-2 line of FIG. It is the figure which looked at the body in the state except a pressure-reducing valve from the 3-3 arrow direction of FIG. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is the figure which looked at the body in the state which removed the oil filter from the 5-5 line arrow direction of FIG. It is an enlarged vertical sectional view of an electromagnetic shut-off valve. FIG. 7 is an enlarged longitudinal sectional view of the pressure reducing valve taken along line 7-7 in FIG. 3. It is a longitudinal cross-sectional view which expands and shows a part of pressure-reduction valve shown in FIG. It is a top view of a partition member. It is sectional drawing which decomposes | disassembles and shows the connection part of a valve shaft and a diaphragm rod. It is sectional drawing which follows the 11-11 line of FIG.

Explanation of symbols

34 ... Body 37 ... Pressure reducing valve 90 ... Valve housing 93 ... Diaphragm 94 ... Recess 91 ... Cover 96 ... Partition member 98 ... Bolt 98a ... Diameter expansion head Part 101: Decompression chamber 111 ... Valve hole 112 ... Valve seat 113 ... Valve body 114 ... Valve shaft 121 ... Pressure working chamber 122 ... Spring chamber 123 ... Spring 164 ... Exit passage 166 ... Communication hole 167 ... Aspirator passage 168 ... Aspirator tube

Claims (4)

The valve housing (90) sandwiches the peripheral portion of the diaphragm (93), and the pressure acting chamber (121) that faces one surface of the diaphragm (93) and the gas pressure acting on the pressure acting chamber (121) are provided. A partition member (96) that partitions the generated decompression chambers (101) is fixed, and a valve that can be seated on a valve seat (112) having a valve hole (111) leading to the decompression chamber (101) opened in the center. A body (113) penetrates the partition member (96) in an airtight and movably manner, and is movably inserted into the valve hole (111) so that one end is connected to the central portion of the diaphragm (93). The valve element (113) is placed in a valve chamber (122) in a spring chamber (122) formed in the valve housing (90) with the other surface of the diaphragm (93) facing the shaft (114). From A pressure reducing valve spring (123) is housed which biases the diaphragm (93) in the direction of translocating,
Said valve housing (90), sandwiching a body (34) having an upper surface a recess (94) facing the diaphragm (93) side, a peripheral portion of said diaphragm (93) between said body (34) A cover (91) coupled to the top of the body (34)
In what the partition member (96) is secured to said body (34) is fitted in the recess (94),
A filter cover (42) is attached to the lower surface (34b) of the body (34) in a detachable manner so as to detachably attach an oil filter (38) through which the gas exiting the decompression chamber (101) passes. A first gas passage (150) for communicating between the inside of the filter (38) and the decompression chamber (101) is formed in the body (34),
In the filter cover (42), an oil reservoir chamber (156) is formed around the oil filter (38) to store oil oozed from the oil filter (38).
On one side surface (45) of the body (34), an outer end of a lateral gas outlet passage (164) formed linearly in the body (34) is opened, and the body (34) A second gas passage (165) in the vertical direction has an opening to the lower surface (34b) at the lower end and communicates between the outlet passage (164) and the oil reservoir chamber (156). The valve shaft (114) On one side of the body (34),
In the partition member (96) formed by press-forming a thin steel plate, a communicating hole (166) communicating with the pressure acting chamber (121) is a portion where the member (96) is in contact with the inner surface of the recess (94). The other end of the aspirator passage (167) formed in the body (34) through one end of the communication hole (166) is directly open to the inner end of the outlet passage (164). ,
The other end of the aspirator passage (167) is fitted with a linear aspirator tube (168) that opens toward the downstream side in the gas flow direction in the outlet passage (164). A pressure reducing valve characterized in that a part of 168) extends into the outlet passage (164) along its passage axis .   The diaphragm (93) has a diameter-enlarged head (98a) that regulates the deflection of the diaphragm (93) toward the pressure action chamber (121) by contacting the surface of the diaphragm (93) on the pressure action chamber (121) side. The pressure reducing valve according to claim 1, wherein the partition member (96) is fixed to the body (34) with a bolt (98). The pressure reducing valve according to claim 1 or 2 , wherein a relief valve (39) leading to the oil reservoir (156) is attached to the filter cover (42) . The body (34) is formed with a back pressure hole (160) that communicates with the oil reservoir chamber (156) and applies a back pressure to the valve shaft (114) from the oil reservoir chamber (156) side. characterized in that that, pressure reducing valve according to claim 1.

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