JP5528090B2 - Piping equipment - Google Patents

Description

  The present invention relates to an apparatus for connecting piping members used in various industries such as chemical factories, semiconductor manufacturing fields, liquid crystal manufacturing fields, food fields, and the like. More specifically, foreign matter is present in the fluid flowing into the piping members. The present invention relates to a piping device that can prevent entry of foreign matter when it is mixed.

  In a conventional piping member, there is a pressure reducing valve as shown in FIG. 10 for removing foreign matters mixed in a fluid (see, for example, Patent Document 1). The configuration includes a pressure detection chamber 114 provided to communicate with the secondary side pressure chamber 111 in the pressure reducing mechanism 113 that controls the opening degree of the main valve 112 according to the pressure fluctuation of the secondary side pressure chamber 111, and the primary A partition wall 116 with the side pressure chamber 115 is formed opposite to the bottom of the primary side pressure chamber 115, and a spindle 117 is inserted into the primary side pressure chamber 115 from the outside of the bottom portion so as to be movable back and forth with respect to the partition wall 116. A valve body 119 that opens and closes the communication port 118 between the pressure detection chamber 114 and the primary pressure chamber 115 provided in the partition wall is provided, and the lower opening end of the cylindrical strainer 121 is fixed to the bottom portion 120, and the strainer 121 is attached to the valve body 119. A strainer cap 122 through which a spindle 117 extending in the axial direction is inserted is detachably provided. The spindle 117 together with the strainer 121 is a strainer. Since the strainer cap 122 is removed during maintenance of the strainer 121, the spindle 117 including the strainer 121 and the valve body 119 can be detached from the valve main body 123, and maintenance can be performed simultaneously. Was something that could be done.

  However, although the conventional pressure reducing valve can be easily replaced even after being connected to the pipe, the structure is different from a normal pressure reducing valve that does not have the strainer 121. There is a problem that a mold is required and the equipment cost is high, and that the number of various parts for making the strainer 121 replaceable increases, so that manufacturing and assembly are complicated. In addition, when a demand for removing foreign matter in the piping occurs after attaching a normal pressure reducing valve having no strainer 121 to the piping line, there is a problem that the pressure reducing valve must be replaced.

  As a method for avoiding the problems of the conventional pressure reducing valve, there is a bellows valve as shown in FIG. 11 (see, for example, Patent Document 2). The structure is such that a groove 132 larger than the flow port 131 is provided on one side of the flange surface of the bellows valve flow port, and one or a plurality of mesh filters 133 fitted to the groove 132 are attached. It was possible to prevent foreign matter from entering at the time, and to collect foreign matter at the bellows valve inlet.

JP 2006-146832 A Japanese Utility Model Publication No. 5-77679

  However, the conventional method for installing the mesh filter 133 of the bellows valve is to provide a mesh filter 133 that fits the groove 132 by providing the flange surface 134 of the circulation port 131 with a groove 132 having a larger thread 135 than the circulation port 131. The mesh filter 133 is fixed by inserting a ring 136 having a thread on the outer periphery thereof, or by providing a groove 132 with a screw hole and screwing it into the screw hole through the hole of the mesh filter. (Not shown). In this case, a normal valve can be used, but in order to install the mesh filter 133, it is necessary to subject the normal valve to secondary processing. Also, if there is a demand for removing foreign matter in the piping after installing a normal valve without a filter in the piping line, remove the valve once and install it after secondary processing, or install another processed valve. It must be replaced, and the mesh filter 133 cannot be installed immediately. In addition, in the bellows valve that is connected to the flange, when replacing the mesh filter with the pipe connected, even if only the flange connecting portion of the mesh filter 133 is removed and replaced, it is difficult to replace the mesh. For this reason, the bellows valve must be temporarily removed from the piping line and the mesh filter 133 must be replaced, which has a problem in that the replacement work is complicated.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a piping device that allows easy attachment and replacement of a filter.

The piping device according to the present invention has a piping member in which a collar portion is formed, a pipe portion to which the piping member is connected, a connected component in which a thread portion is formed on the outer peripheral surface of the pipe portion, and one end side of the piping device. A cap nut that is engaged with the flange portion of the member and the other end is screwed to the threaded portion of the connected component, and fixes the piping member to the connected component, and the end surface of the piping member and the pipe portion that opposes this end surface possess an annular groove formed in one end face Noi deviation, and the seal ring cross-sectional shape to be fitted into the annular groove has a substantially circular shape, and a filter disposed on the inner peripheral side of the seal ring, the annular The depth of the groove is deeper than the radius of the circular cross section of the seal ring, the heights of the side walls on the radially inner side and the outer side of the annular groove are substantially the same, and the outer peripheral edge of the filter is located inside the seal ring. The connection between the filter and the inner peripheral surface of the seal ring is The pipe member and the pipe part are arranged to be deviated from the center of the circular cross section of the seal ring to the side where the annular groove is not formed, and the filter and the inner peripheral surface of the seal ring are arranged from the end face on the annular groove side of the seal ring. The distance to the connecting portion is substantially the same as the depth of the annular groove .

  According to the present invention, the filter can be attached and exchanged by removing the cap nut, and the attachment and exchange work of the filter is easy.

It is a longitudinal cross-sectional view which shows the structure of the piping apparatus which concerns on 1st embodiment of this invention. It is a principal part enlarged view of FIG. It is a longitudinal cross-sectional view which shows the time of replacement | exchange of the seal ring with a filter. It is a principal part enlarged view which shows the diaphragm valve which used the annular groove as a groove | channel. It is a principal part enlarged view which shows the diaphragm valve which provided the inner peripheral protrusion part and the outer peripheral protrusion part in the seal ring with a filter. It is a principal part enlarged view which shows the diaphragm valve which provided the annular protrusion in the seal ring with a filter. It is a principal part enlarged view which shows the diaphragm valve of the structure which can assemble a seal ring with a filter. It is a longitudinal cross-sectional view which shows the structure of the piping apparatus which concerns on 2nd embodiment of this invention. It is a longitudinal cross-sectional view which shows the structure of the piping apparatus which concerns on 3rd embodiment of this invention. It is a longitudinal cross-sectional view which shows the conventional pressure reducing valve. It is a longitudinal cross-sectional view which shows the conventional bellows valve.

  Hereinafter, embodiments of the present invention will be described with reference to the embodiments shown in the drawings. However, it is needless to say that the present invention is not limited to the embodiments.

-First embodiment-
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In the first embodiment, a connected device connected to a piping member is a diaphragm valve, and the piping device is applied to the diaphragm valve. FIG. 1 is a longitudinal sectional view showing a configuration of a piping device according to a first embodiment of the present invention, and FIG. 2 is an enlarged view of a main part of FIG.

  An annular protrusion 1a joined to the lower part of the cylinder body 18 is formed on the upper part of the main body 1 made of vinyl chloride resin (hereinafter referred to as PVC), and an annular groove 2 is formed on the inner periphery of the annular protrusion 1a. Is formed. A valve chamber 3 is formed on the upper surface of the main body 1 by the inner peripheral wall of the annular groove 2 and the diaphragm 9, and a valve body 10 is disposed in the valve chamber 3. On both end faces of the main body 1, pipe portions 1c and 1d project outwardly, respectively, and a first opening 4 serving as a fluid inlet and a second fluid outlet serving as a fluid outlet are provided inside the tube portions 1c and 1d, respectively. An opening 5 is provided. Inside the main body 1, a first flow path 6 that communicates the first opening 4 and the bottom of the valve chamber 3 and a second flow path 7 that communicates the second opening 5 and the bottom of the valve chamber 3 are formed. ing. An opening that is a communication port that communicates the first flow path 6 and the valve chamber 3 is located at the center of the bottom of the valve chamber 3, and a peripheral edge of the opening at the end of the first flow path 6 serves as a valve seat 8. Thus, the valve body 10 is separated from the valve seat portion 8.

  The diaphragm 9 is made of polytetrafluoroethylene (hereinafter referred to as PTFE), and the upper center portion thereof is received in the concave portion 28 on the inner peripheral surface of the diaphragm retainer 27. A valve body 10 is formed on the lower surface of the diaphragm 9 so as to be pressed against and separated from the valve seat portion 8. On the upper surface of the valve body 10, a female screw portion that is screwed to the male screw portion of the shaft portion 26 of the piston 24 is provided, and the valve body 10 and the piston 24 are integrated. For this reason, the valve body 10 moves up and down as the piston 24 moves up and down and is pressed against and separated from the valve seat 8 of the main body 1, whereby the flow path can be closed or opened. A thin-walled diaphragm portion 11 is formed at the peripheral portion of the valve body 10, and an annular fitting portion 11 a having a rectangular cross section is formed at the outer peripheral end portion of the diaphragm portion 11. The annular fitting portion 11 a is fitted in the annular groove 2 of the main body 1 and is fixed between the main body 1 and the lower surface of the diaphragm retainer 27.

  The cap nut 12 is made of PVC, and is formed in a substantially cylindrical shape as a whole. As shown in FIG. 2, the inner periphery of one end portion of the cap nut 12 is provided with a female screw portion 12 a that is screwed to a male screw portion 1 b provided on the outer periphery of the tube portion 1 c of the main body 1, and the other end portion. Is provided with an inner flange 12b protruding in the inner circumferential direction. The inner flange portion 12b of the cap nut 12 engages and comes into contact with the flange end surface 13a of the flanged short tube 13, and the female screw portion 12a is screwed to the male screw portion 1b of the main body 1, whereby the cap nut 12 A short tube 13 with a flange is fixed to the main body 1. As shown in FIG. 1, a cap nut 14 is similarly fastened to the pipe portion 1 d on the second opening 5 side, and the flanged short pipe 15 is fixed to the main body 1 by the cap nut 14. As shown in FIG. 2, the flanged short pipes 13 and 15 are pipe members provided with a hook part 13b at one end and a connecting part 13c connected to another pipe at the other end. Configure the valve accessories.

  An annular groove 30 is formed on one end surface of the first opening side tube portion 1c of the main body 1 facing the end surface of the flanged short tube 13, and a filter-attached seal ring 17 is fitted into the annular groove 30. As shown in FIG. 2, the filter-attached seal ring 17 is a filter integrally provided on the inner peripheral side of the seal ring. The seal ring portion of the filter-attached seal ring 17 is fitted in the annular groove 30. . In a state in which the flanged short tube 15 is fixed to the main body 1 by the cap nut 12, a seal ring 17 with a filter is sandwiched between both end surfaces of the flanged short tube 15 and the main body 1, and the end surface of the tube portion 1c is sealed with a filter. Sealed by a ring 17. On the other hand, an annular groove 31 is similarly formed on the second opening 5 side of the main body 1, and a seal ring 16, which is an O-ring, is fitted into the annular groove 31, and the end surface of the pipe portion 1 d is a seal ring. 16 is sealed. Note that either the seal ring 16 or the filter-attached seal ring 17 can be attached to the annular grooves 30 and 31.

  A cylinder body 18 is fixed to the upper portion of the body 1 by bolts and nuts (not shown), and a stepped cylinder portion 19 is provided inside the cylinder body 18. A first space portion 20 surrounded by the ceiling surface, the inner peripheral surface of the cylinder portion 19, and the upper surface of the piston 24 is formed inside the cylinder portion 19, and the upper surface of the diaphragm retainer 27 and the inside of the cylinder portion 19 are formed. A second space 21 surrounded by the peripheral surface and the lower end surface of the piston 24 is formed. A first working fluid communication port 22 that communicates with the first space portion 20 and a second working fluid communication port 23 that communicates with the second space portion 21 are formed on the side surfaces of the cylinder body 18. The cylinder body 18 may have a structure in which a cylinder cover is provided separately on the upper part, or may have a structure in which the cylinder cover as in the present embodiment is provided as one part with the cylinder body 18.

  The piston 24 is provided with a flange portion 25 having an annular groove portion for holding an O-ring on the upper outer peripheral surface. The piston 24 slides in the cylinder portion 19 in the vertical direction on the inner peripheral surface of the cylinder portion 19. It is housed freely. A shaft portion 26 having a male screw portion formed at the lower end portion is suspended from the flange portion 25 and provided integrally with the lower portion of the piston 24. The shaft portion 26 penetrates the through hole 29 of the diaphragm retainer 27, and an annular groove portion for holding the O-ring is provided on the side surface of the shaft portion 26.

  A bottomed cylindrical recess 28 is formed below the diaphragm retainer 27. A through hole 29 into which the shaft portion 26 of the piston 24 is inserted is formed in the center of the upper surface of the recess 28, and a tapered portion that decreases in diameter toward the recess 28 is provided on the lower surface of the diaphragm retainer 27. An O-ring is fitted on the outer periphery of the upper portion of the diaphragm retainer 27, and the diaphragm retainer 27 is inserted into the lower portion of the cylinder body 18 via the O-ring.

  The material of the main body 1, the cylinder main body 18, the piston 24, and the diaphragm retainer 27 may satisfy the necessary physical properties, for example, PVC, polyvinylidene fluoride (hereinafter referred to as PVDF), polypropylene (hereinafter referred to as PP), PTFE, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (hereinafter referred to as PFA), polyphenylene sulfide (hereinafter referred to as PPS) and the like are used. In particular, since the cylinder body 18 requires dimensional accuracy, PVDF, PP, PPS or the like containing glass is used.

  The material of the diaphragm 9 is preferably a resin such as PP, PVDF, PTFE, or PFA. Further, the diaphragm 9 may be a rubber-like elastic body, and ethylene propylene rubber, isoprene rubber, chloroprene rubber, chlorosulfonated rubber, nitrile rubber, styrene butadiene rubber, chlorinated polyethylene, fluorine rubber, etc. are suitable. Can be mentioned. Further, a strong reinforcing cloth may be inserted into the diaphragm 9, and the reinforcing cloth is preferably made of nylon (in the case of fluororubber, made of polyvinylidene fluoride). This is suitable for preventing deformation and breakage of the diaphragm 9 when fluid pressure is applied to the diaphragm 9 when the valve is closed.

  Next, the effect | action of the piping apparatus in 1st embodiment is demonstrated based on FIG. 1, FIG.

  When compressed air, which is a working fluid, is supplied from the first working fluid communication port 22 to the first space portion 20 formed by the upper portion of the piston 24 and the inner peripheral surface of the cylinder body 18 in the open state of the valve, The piston 24 is pushed down by the pressure. When the piston 24 is pushed down, the diaphragm 9 connected to the piston 24 is pushed down, the valve body 10 is pressed against the valve seat portion 8, the flow path is closed, and the valve is closed. When the working fluid is discharged from the first working fluid communication port 22 and the compressed air is supplied from the second working fluid communication port 23 in the closed state, the piston 25 is pushed upward, and the valve body 10 is moved to the valve seat portion. The flow path is opened away from 8 and the valve is opened. In the present embodiment, the drive unit for moving the valve body 10 up and down is of an air drive type, but may be a manual type provided with a handle or an electric drive type provided with an electric motor.

  Here, when the fluid flowing through the piping line flows in from the first opening 4 side of the diaphragm valve, the foreign matter mixed in the fluid is removed by the filter portion of the seal ring 17 with the filter. For this reason, it is possible to prevent fluid leakage at the time of closing or damage to the valve body 10 due to biting of foreign matter when the valve body 10 is closed, and foreign matter flows into equipment installed on the downstream side of the valve. It is possible to prevent malfunctions and adverse effects caused by

  Next, filter replacement work will be described with reference to FIG.

  When replacing the filter, as shown in FIG. 3, after loosening the cap nut 12 of the valve, the flanged short tube 13 is shifted from the main body 1, and the filter-attached seal ring 17 is removed from the annular groove 30. Next, a new seal ring 17 with a filter is attached to the annular groove 30, and then the short tube 13 with the flange is returned and the cap nut 12 is screwed onto the tube portion 1c of the main body 1 to complete the replacement operation. Thus, in this embodiment, the filter can be replaced simply by removing the cap nut 12 on the side where the seal ring 17 with a filter is attached. Further, the filter can be replaced simply by removing the seal ring 17 with the filter from the annular groove 30 and attaching a new one, and the replacement work can be easily performed in a short time without requiring a dedicated tool.

  Even when a filter is attached to an existing valve (a seal ring that is an O-ring is attached to the annular groove 30), the seal ring (fitting the annular groove 30) as in the above-described filter replacement operation. It is only necessary to remove the O-ring) and attach the seal ring 17 with the filter to the annular groove 30, and the filter can be easily attached to the existing valve without performing valve replacement or post-processing.

  The annular groove 32 into which the seal ring with filter 17 is fitted may be formed as a dovetail groove having a trapezoidal cross section as shown in FIG. By fitting the seal ring with filter 17 into the annular groove 32 of such a dovetail groove, the seal ring with filter 17 is held by the groove side surface of the annular groove 32 of the dovetail groove, and is difficult to come off from the annular groove 32. The parts can be prevented from being lost and the filter ring 17 can be easily attached and replaced. Note that the annular groove may have another shape as long as the groove width is increased in the depth direction of the groove.

  Moreover, as a structure of the seal ring 33 with a filter, you may provide protrusions, such as the inner peripheral protrusion 34 and the outer periphery protrusion 35, as shown in FIG. The inner peripheral ridge portion 34 and the outer peripheral ridge portion 35 are spatula-shaped ones projecting at an angle inclined annularly toward the inner peripheral side and the outer peripheral side, respectively, and the filter-attached seal ring 33 is fitted into the annular groove 30. At this time, since the inner peripheral protrusion 34 and the outer peripheral protrusion 35 are fitted so as to be pressed against the side wall of the annular groove 30, the filter-attached seal ring 33 is difficult to come off from the annular groove 30. 33 is easily attached and replaced. In addition, the protruding part which protruded incline may be provided in either one of the inner peripheral side of the seal ring 33, and the outer peripheral side.

  As a structure of the seal ring with a filter, an annular protrusion such as an annular protrusion 37 may be provided on the contact surface with the flanged short tube 13 as shown in FIG. Thus, by providing the annular protrusion 37 on the contact surface of the filter-attached seal ring 36 that contacts the flanged short tube 13, the sealing performance with the contact surface can be improved by line contact with the annular protrusion 37. it can. In addition, you may provide the annular protrusion 37 in the contact surface with the main body 1 of the seal ring 36 with a filter. That is, an annular protrusion may be provided on one or both sides of the seal ring with filter 36.

  The seal ring 17 with a filter in the first embodiment is formed by integrally forming a seal ring and a filter. This seal ring 17 with a filter is formed by inserting a filter portion provided in a mesh shape into a mold. Can be formed by integrally molding. The configuration of the filter-attached seal ring is not limited to this, and for example, as shown in FIG. 7, the filter-attached seal ring 38 may be configured to be disassembled and assembled into a filter portion 39 and a seal ring portion 40. In this configuration, a notch groove 40a is provided on the inner peripheral surface of the seal ring portion 40, the outer peripheral edge portion of the filter portion 39 is fitted into the notch groove, and the outer peripheral edge of the filter portion 39 is formed in the notch groove 40a. It is installed in the annular groove 30 of the main body 1 while being sandwiched by the side surfaces. Therefore, the filter replacement work can be performed by removing the seal ring with filter 38 from the main body 1 and replacing only the filter portion 39, which is economical.

According to the above first embodiment, the following effects can be obtained.
(1) Since the filter-attached seal ring 17 is installed at the connecting portion between the flanged short tube 13 and the main body 1, foreign matters generated in the fluid flowing through the piping line can be removed. As a result, it is possible to prevent fluid leakage or damage to the valve body due to biting of foreign matter when the valve is closed, adverse effects on the equipment due to foreign matter or damage to the equipment.
(2) Since the filter is supported by the seal ring, it is not necessary to separately provide a support portion for the filter on the main body or the like. For this reason, a filter can be easily installed in the existing valve in which the annular groove 31 for the seal ring is formed without performing post-processing.
(3) The filter can be replaced only by removing the cap nut 12 where the seal ring with filter 17 is installed from the annular groove 30 and installing a new seal ring 17 with filter. It can be done easily in a short time.
(4) If the annular groove 32 is a dovetail groove (FIG. 4), the filter-attached seal ring 17 is unlikely to fall off the annular groove 32, and loss of parts can be prevented.

-Second embodiment-
A second embodiment of the present invention will be described with reference to FIG. In the second embodiment, a connected device is used as a constant pressure valve, and a piping device is applied to the constant pressure valve. FIG. 8 is a longitudinal sectional view showing the configuration of the piping device according to the second embodiment of the present invention.

  The body 41 made of PTFE has a first diameter that is larger than the diameter of the second gap 49 that is open to the bottom center and the second gap 49 that is open at the top. The void 50 is provided. Tube portions 41a and 41b projecting outward are formed on both side surfaces of the main body 41, and a first opening 58 and a second opening 59 are formed inside the tube portions 41a and 41b, respectively. Inside the main body 41, there are a first channel 51 communicating with the first opening 58 and the second gap 49, and a second channel 52 communicating with the second opening 59 and the first gap 50. In addition, a communication hole 53 that communicates the first gap 50 and the second gap 49 and has a diameter smaller than the diameter of the first gap 50 is provided. The upper surface portion of the second gap 49 is a valve seat 54. On the outer peripheral side of the first opening 58 and the second opening 59 on both end faces of the main body 41, annular grooves 83 and 84 into which seal rings are fitted are formed. A seal ring 90 that is an O-ring is fitted in the annular groove 84 on the second opening 59 side, and a seal ring 89 with a filter is fitted in the annular groove 83 on the first opening 58 side. Since the configuration of the seal ring with filter 89 is the same as that of the first embodiment, the description thereof is omitted.

  The cap nut 85 made of PVC is formed in a substantially cylindrical shape, and a female screw portion that is screwed to a male screw portion provided on the outer periphery of the first opening side tube portion 41a of the main body 41 is formed on the inner periphery of one end portion thereof. The other end is provided with an inner collar portion that protrudes in the inner circumferential direction. The cap nut 85 fixes the flanged short tube 87 by the inner flange portion coming into contact with the flange end surface of the flanged short tube 87 and screwed to the external thread portion of the outer periphery of the tube portion 41a of the main body 41. Similarly, in the second opening 59, the short tube 88 with a flange is fixed by screwing a cap nut 86 onto the male thread portion on the outer periphery of the second opening side tube portion 41b of the main body 41.

  The PVDF bonnet 42 is provided with a cylindrical gap 55 therein, and a step 56 having a diameter larger than that of the gap 55 is provided on the inner peripheral surface of the lower end. In order to supply compressed air to the gap 55, a vent hole 57 that communicates the gap 55 with the outside is provided on the side surface of the bonnet 42. In addition to the vent hole 57, a minute hole for discharging compressed air may be provided.

  The flat circular spring receiver 43 made of PVDF has a through-hole 60 at the center, and the upper half of the spring receiver 43 is fitted into the step 56 of the bonnet 42. An annular groove 61 in which an O-ring is mounted is provided on the side surface of the spring receiver 43 to prevent the compressed air from flowing out from the bonnet 42 to the outside.

  The piston 44 made of PVDF includes a disc-shaped flange portion 62 at the upper portion, a piston shaft 63 provided in a cylindrical shape protruding from the central lower portion of the flange portion 62, and a female screw portion provided at the lower end of the piston shaft 63. The first joint 64 is formed. The piston shaft 63 is provided with a smaller diameter than the through hole 60 of the spring receiver 43, and the first joint 64 is screwed to the second joint 69 of the first valve mechanism 46.

  A SUS spring 45 is sandwiched between the lower end surface of the flange portion 62 of the piston 44 and the upper end surface of the spring receiver 43. Although the spring 45 expands and contracts as the piston 44 moves up and down, it is preferable to use the spring 45 having a long free length so that the change in load at that time is small.

  The first valve mechanism 46 made of PTFE includes a membrane portion 66 having a cylindrical portion 65 provided so as to protrude upward from the outer peripheral edge portion, a first diaphragm 67 having a thick portion at the center portion, A second joint 69 made of a small-diameter male screw provided at the upper end of the shaft 68 provided to protrude from the center upper surface of the diaphragm 67, and provided to protrude from the center lower surface of the first diaphragm 67 at the lower end. The formed female screw portion has a third joint portion 70 that is screwed into the fourth joint portion 74 of the second valve mechanism 47. The cylindrical portion 65 of the first diaphragm 67 is formed so that the first valve chamber 71 is sealed by the lower surface of the first diaphragm 67 by being sandwiched and fixed between the main body 41 and the spring receiver 43. Further, the gap 55 of the bonnet 42 above the upper surface of the first diaphragm 67 is sealed by an O-ring to form an air chamber filled with compressed air supplied through the vent hole 57 of the bonnet 42. .

  The PTFE second valve mechanism 47 is disposed in the second gap 49 of the main body 41, and is provided so as to protrude from the upper end surface of the valve body 72 having a larger diameter than the communication hole 53. Provided on the upper end of the shaft portion 73, a fourth joint portion 74 having a male screw portion screwed into the third joint portion 70, and a lower end surface of the valve body 72. It comprises a rod 75 and a second diaphragm 77 having a cylindrical protrusion 76 provided extending in the radial direction from the lower end surface of the rod 75 and protruding downward from the peripheral edge. The cylindrical projection 76 of the second diaphragm 77 is sandwiched between the projection 79 of the base plate 48 and the main body 41, thereby forming a second gap 49 of the main body 41 and the second diaphragm 77. The second valve chamber 78 is sealed.

  The base plate 48 made of PVDF has a protruding portion 79 at the center of the upper portion thereof that clamps and fixes the cylindrical protruding portion 76 of the second diaphragm 77 with the main body 41. A cutout recess 80 is provided at the upper end of the protruding portion 79, and a breathing hole 81 communicating with the cutout recess 80 is provided on the side surface of the base plate 48. The main body 41 is passed between the base plate 48 and the bonnet 42 by a bolt and nut (not shown). In this embodiment, the spring 45 is provided in the gap 55 of the bonnet 42 and the piston 44, the first valve mechanism 46, and the second valve mechanism 47 are urged upward. The piston 44, the first valve mechanism 46, and the second valve mechanism 47 may be configured to be urged upward by being provided in the cutout recess 80 of 48.

  Next, the operation of the constant pressure valve with respect to the operating pressure supplied from the electropneumatic converter (not shown) will be described.

  The valve body 72 of the second valve mechanism 47 has a repulsive force of the spring 45 sandwiched between the flange 62 of the piston 44 and the spring receiver 43, and a lower surface of the first diaphragm 67 of the first valve mechanism 46. A force urging upward acts on the fluid pressure, and a force urging downward acts on the operation pressure on the upper surface of the first diaphragm 67. Strictly speaking, the lower surface of the valve body 72 and the upper surface of the second diaphragm 77 of the second valve mechanism body 47 are subjected to fluid pressure, but their pressure receiving areas are almost equal, so the force is almost offset. . Therefore, the valve body 72 of the second valve mechanism 47 is stationary at a position where the above three forces are balanced.

  When the operating pressure supplied from the electropneumatic converter is increased, the force that pushes down the first diaphragm 67 increases, so that the fluid formed between the valve body 72 of the second valve mechanism body 47 and the valve seat 54 is increased. Since the opening area of the controller 82 increases, the pressure in the first valve chamber 71 can be increased. Conversely, when the operating pressure is decreased, the opening area of the fluid control unit 82 is decreased and the pressure is also decreased. Therefore, an arbitrary pressure can be set by adjusting the operation pressure.

  In this state, when the upstream fluid pressure increases, the pressure in the first valve chamber 71 also increases instantaneously, and the first diaphragm 67 has a first pressure higher than the force received from the compressed air by the operating pressure. The force that the lower surface of the diaphragm 67 receives from the fluid becomes larger, and the first diaphragm 67 moves upward. Accordingly, the position of the valve body 72 also moves upward, so that the opening area of the fluid control unit 82 formed with the valve seat 54 decreases, and the pressure in the first valve chamber 71 decreases. Eventually, the valve body 72 moves to a position where the above-described three forces are balanced and stops. At this time, if the load of the spring 45 does not change significantly, the pressure inside the gap 55, that is, the force received by the upper surface of the first diaphragm 67 is constant, so the pressure received by the lower surface of the first diaphragm 67 is substantially constant. Accordingly, the fluid pressure on the lower surface of the first diaphragm 67, that is, the pressure in the first valve chamber 71 is substantially the same as the original pressure before the upstream pressure increases.

  When the upstream fluid pressure decreases, the pressure in the first valve chamber 71 also decreases instantaneously, and the lower surface of the first diaphragm 67 is lower than the force that the upper surface of the first diaphragm 67 receives from the compressed air due to the operating pressure. The force received from the fluid becomes smaller, and the first diaphragm 67 moves downward. Accordingly, the position of the valve body 72 also moves downward, so that the opening area of the fluid control unit 82 formed between the valve seat 54 and the fluid pressure in the first valve chamber 71 increases. Eventually, the valve body 72 moves to a position where the above-described three forces are balanced and stops. Accordingly, the fluid pressure in the first valve chamber 71 is substantially the same as the original pressure, as in the case where the upstream pressure has increased.

  Also in the second embodiment, as in the first embodiment, when the fluid flowing through the piping line flows in from the first opening 58 side of the constant pressure valve, the foreign matter mixed in the fluid is removed from the seal ring 89 with a filter. The filter part can be removed. Therefore, it is possible to prevent fluid leakage at the time of closing due to biting of foreign matter when the valve body 72 is closed, damage to the valve body 72, failure of pressure control due to foreign matter, etc., and equipment installed on the downstream side of the valve The occurrence of problems and adverse effects due to the inflow of foreign matter can be prevented. Since the method for attaching the filter-attached seal ring in the second embodiment is the same as that in the first embodiment, description thereof is omitted.

  In the first embodiment and the second embodiment, the piping device is applied using the diaphragm valve and the constant pressure valve as a valve, but as long as it has a pipe connection structure with a flanged short pipe and a cap nut, The present invention can be applied to any valves such as a ball valve, a stop valve, a ball check valve, a pinch valve, and a constant flow valve (not shown).

-Third embodiment-
A third embodiment of the present invention will be described with reference to FIG. In the third embodiment, a pipe device is applied to an expansion joint with the connected component as an expansion joint. FIG. 9 is a longitudinal sectional view showing the configuration of the piping device according to the third embodiment of the present invention.

  A flow path 92 is formed inside a hollow cylindrical main body 91 made of PVC. The main body 91 has a tubular shape as a whole and constitutes a tube portion. A connection portion 94 to which a short tube 93 with a flange is connected is provided at one end portion, and a first opening 110 is formed in the connection portion 94. . A male thread portion into which a cap nut 98 is screwed is formed on the outer periphery of the connection portion 94, and an annular groove 96 for mounting the filter-attached seal ring 95 is provided on the end surface. On the other hand, an opening 97 serving as a second opening is provided at the other end of the main body 91, and a sliding short tube 99 is inserted through the opening 97. Since the structure of the seal ring with filter 95 is the same as that of the first embodiment, the description thereof is omitted.

  The cap nut 98 is made of PVC, and is formed in a substantially cylindrical shape as a whole. A cap screw 98 has a female screw portion 98a that is screwed into a male screw portion 91a provided on the outer periphery of the connection portion 94 of the main body 91, and an inner peripheral portion of the cap nut 98 at the inner end thereof. An inner flange 98b protruding in the direction is provided. The inner flange portion 98b of the cap nut 98 abuts on the flange end surface 93a of the flanged short tube 93, and the female screw portion 98a is screwed to the male screw portion 91a of the main body 91, whereby the cap nut 98 causes the flanged short tube. 93 is fixed to the main body 91.

  The PVC short tube 99 for sliding is provided at the tube portion 100 provided to be able to advance and retreat from the opening 97 of the main body 91 and at one end portion of the pipe portion 100, and the outer periphery is substantially the same diameter as the flow path 92 of the main body 91. And a bowl-shaped slide portion 101. An annular groove 102 is provided on the outer peripheral surface of the slide portion 101, and a seal ring is attached to the annular groove 102, so that the slide portion 101 can slide in a watertight state with respect to the inner peripheral surface of the flow path 92 of the main body 91. ing. At the other end of the pipe part 100, a pipe connection part 103 to which another pipe is connected is provided. A flow path 104 communicating with the flow path 92 of the main body 91 is provided in the slide short tube 99.

  A PVC short-tube-shaped stopper 105 made of PVC prevents the sliding short tube 99 from coming out of the main body 91. The inner periphery of the stopper portion 105 is smaller than the outer diameter of the slide portion 101 of the sliding short tube 99 and larger than the outer diameter of the tube portion 100. A cap nut 106 is screwed onto the outer periphery of the opening 97 of the main body 91, and the collar portion of the stopper portion 105 is clamped and fixed to the end surface of the opening 97 of the main body 91 by the cap nut 106. In this embodiment, the stopper portion 105 has a flanged short tube shape. However, the stopper portion 105 is not particularly limited as long as it has a shape that can prevent the sliding short tube 99 from slipping out of the main body 91, and is divided by half. An attached short tube shape or an annular shape may be used. Further, it may be provided integrally with the cap nut 106 in order to reduce the number of parts.

  Next, the operation of the expansion joint of FIG. 9 will be described.

  When a pipe (not shown) connected to the expansion joint expands in the axial direction due to an abrupt water pressure (water hammer, etc.) of fluid or an increase in temperature or temperature, the sliding portion of the sliding short tube 99 While the outer peripheral surface of 101 slides with the inner peripheral surface of the flow path 92 of the main body 91 in a watertight state, it moves relative to the inner side by the amount of impact or thermal expansion due to the sudden water pressure of the pipe, and the expansion joint The length is shortened. As a result, the expansion joint can absorb stress due to rapid water pressure or thermal expansion of the pipe. When the negative pressure of the fluid or the piping contracts due to a decrease in temperature, the sliding short tube 99 moves outwards by the amount corresponding to the contraction due to the opposite action of water hammer or thermal expansion, and expands and contracts. The length of the joint becomes longer. Thereby, the stress due to the contraction of the pipe can be absorbed.

  Also in the third embodiment, when the fluid flowing through the piping line flows in from the opening on the connection portion 94 side of the expansion joint, the foreign matters mixed in the fluid can be removed by the filter portion of the seal ring with filter 95. it can. For this reason, it is possible to prevent the occurrence of a malfunction in the expansion / contraction operation of the expansion joint due to the foreign matter biting into the sliding portion of the slide portion 101. Since the method for attaching the filter-attached seal ring in the third embodiment is the same as that in the first embodiment, description thereof is omitted. In the third embodiment, the piping device is applied using an expansion joint as a joint. However, any joint such as a union joint or a strainer may be used as long as it has a pipe connection structure with a flanged short pipe and a cap nut. Is also applicable (not shown).

  In the above embodiment, the flanged short pipes 13, 87, 93 are used as accessories for valves and joints. However, the piping member may not be an accessory for valves or joints, and a flange is formed. Other piping members may be used. The shape of the piping member is not limited to that described above. For example, the connecting portion 13c (FIG. 2) at the end of the flanged short tubes 13, 87, 97 is formed into a flange shape, and the flanged short tubes 13, 87, 97 may be connected to another pipe. Valves and joints in which pipe parts for connecting pipe members (1c, 1d in FIG. 1) are formed at the ends of the main bodies 1, 41, 91 as connected parts to which the short pipes 13, 87, 97 with flanges are connected. However, other threaded parts may be used as long as a threaded portion with which a cap nut is screwed is formed on the outer peripheral surface of the tube portion. If one end is engaged with the flange of the piping member (12b in FIG. 2) and the other end is screwed into the threaded portion (1b in FIG. 2) to fix the piping member to the main body, then a cap nut The configuration of 12 may be any. In the above embodiment (FIG. 1), the annular groove 30 for the seal ring is formed on the end surface of the main body 1. However, instead of or in addition to this, the end surface of the flanged end tube 13 is used for the seal ring. An annular groove may be formed. As long as the filter is disposed inside the seal ring, the configuration of the seal ring and the filter is not limited to that described above. In the above embodiment (FIGS. 1, 8, and 9), the filter is disposed along with the seal ring at the connection portion on the first opening side of the main body. However, the filter may be disposed at the connection portion on the second opening side. A filter may be disposed at both the first opening side and the second opening side connection portions. That is, the present invention is not limited to the piping device of the embodiment as long as the features and functions of the present invention can be realized.

DESCRIPTION OF SYMBOLS 1 Main body 1c, 1d Pipe part 2 Annular groove 3 Valve chamber 4, 58 First opening 5, 59 Second opening 6, 51 First flow path 7, 52 Second flow path 8 Valve seat part 9 Diaphragm 10 Valve body 11 Diaphragm part 12, 85 Cap nut 13, 87 Short pipe with flange 14, 86 Cap nut 15, 88 Short pipe with flange 16, 89 Seal ring 17, 33, 36, 38, 90 Seal ring with filter 18 Cylinder body 19 Cylinder part 20 One space portion 21 Second space portion 22 First working fluid communication port 23 Second working fluid communication port 24 Piston 25 Gutter portion 26 Shaft portion 27 Diaphragm retainer 28 Recess 29 Through hole 30, 32 Annular groove 31 Annular groove 34 Inner circumferential protrusion Ridge 35 outer ridge 37 annular ridge 39 filter 40 seal ring 41 main body 41a, 41b pipe 42 bonnet 43 spring support 44 Piston 45 Spring 46 First valve mechanism 47 Second valve mechanism 48 Base plate 49 Second gap 50 First gap 53 Communication hole 54 Valve seat 91 Main body 93 Short tube with flange 95 Seal ring with filter 98 Cap nut 99 Short pipe for slide 100 Pipe part 101 Slide part 105 Stopper part

Claims (13)

A piping member formed with a buttock;
A connected part having a pipe part to which the piping member is connected, and a threaded part formed on the outer peripheral surface of the pipe part;
One end side is engaged with the flange portion of the piping member, the other end side is screwed into the threaded portion of the connected component, and a cap nut that fixes the piping member to the connected component;
An end face and the end face Noi displaced or which is formed in an annular groove of said tube portion opposed to the end surface of the pipe member,
A seal ring having a substantially circular cross-sectional shape fitted in the annular groove;
Have a said arranged on the inner peripheral side of the seal ring filter,
The depth of the annular groove is deeper than the radius of the circular cross section of the seal ring, and the heights of the side walls on the radially inner side and the outer side of the annular groove are substantially the same.
The outer peripheral edge of the filter is disposed inside the seal ring,
The connecting portion between the filter and the inner peripheral surface of the seal ring is arranged so as to be deviated from the center of the circular cross section of the seal ring toward the pipe member and the pipe portion where the annular groove is not formed. ,
The piping device , wherein a distance from an end surface of the seal ring on the annular groove side to a connection portion between the filter and the inner peripheral surface of the seal ring is substantially the same as a depth of the annular groove . In the piping device according to claim 1,
The annular device is a piping device characterized in that the groove width is increased in the depth direction of the groove. In the piping device according to claim 1 or 2,
The piping device, wherein the seal ring and the filter are integrally formed. In the piping device according to any one of claims 1 to 3,
The said seal ring has a protrusion part which inclined and protruded in the at least one of the inner peripheral side and the outer peripheral side, The piping apparatus characterized by the above-mentioned. In the piping device according to any one of claims 1 to 4,
The piping device, wherein the seal ring is provided with an annular protrusion on at least one of a contact surface with the piping member and a contact surface with the pipe portion. In the piping device according to any one of claims 1 to 5,
2. The piping device according to claim 1, wherein the piping member is a short tube with a flange in which a flange portion is formed at one end portion and a connecting portion that is connected to another piping member is formed at the other end portion. In the piping device according to any one of claims 1 to 6,
The connected component has a first opening and a second opening, and is a valve that opens and closes a flow path communicating with these openings,
The piping device, wherein the piping member is connected to at least one of the first opening and the second opening via the seal ring. In the pipe installation according to claim 7,
The piping device, wherein the valve is any one of a ball valve, a diaphragm valve, a stop valve, a ball check valve, a pinch valve, a constant pressure valve, and a constant flow valve. In the piping device according to claim 7 or 8,
The valve is
The disc,
A valve chamber in which the valve body is disposed;
A first flow path communicating the valve chamber and the first opening;
A second flow path communicating the valve chamber and the second opening;
A valve seat provided at a terminal portion of the first flow path or the second flow path, to which the valve body is separated;
A piping device comprising: a drive unit that drives the valve body. In the piping device according to claim 9,
The drive unit is one of a manual drive type in which the valve body is driven manually, an air drive type in which the valve body is driven by air, and an electric drive type in which the valve body is driven electrically. Plumbing equipment characterized. In the piping device according to claim 7,
The connected parts are:
The second gap provided in the center of the lower part to the bottom, the second gap, the first flow path communicating with the first opening, and the upper face open to the upper part, the diameter of the second gap. A first gap having a large diameter, a first gap, a second flow path communicating with the second opening, the first gap, and the second gap, respectively, and a diameter smaller than the diameter of the first gap. A body having a communication hole having a top surface of the second gap as a valve seat;
A bonnet having a cylindrical gap communicating with a ventilation hole provided on a side surface or an upper surface therein, and having a stepped portion on a lower end inner peripheral surface;
A spring receiver that is inserted into the step of the bonnet and has a through hole in the center, and a first joint part that is smaller in diameter than the through hole of the spring receiver at the lower end, and a flange is provided at the upper part, A piston inserted in a movable manner;
A spring clamped and supported by the lower end surface of the flange of the piston and the upper end surface of the spring receiver;
A first diaphragm whose peripheral part is sandwiched and fixed between the main body and the spring receiver and the first valve chamber is formed so as to cover the first gap of the main body; The first joint portion has a second joint portion that is joined and fixed to the first joint portion of the piston through the through hole of the spring receiver, and a third joint portion that is provided at the center of the lower surface and penetrates the communication hole of the main body. A valve mechanism;
A valve body located inside the second gap of the main body and having a larger diameter than the communication hole of the main body, and a first member that protrudes from the upper end surface of the valve body and is fixed to the third joint portion of the first valve mechanism body. A second valve mechanism having four joints, a rod provided protruding from the lower end surface of the valve body, and a second diaphragm provided extending in the radial direction from the rod lower end surface;
There is a protrusion at the center of the upper part of the protrusion, which is located below the main body and clamps and fixes the second diaphragm peripheral edge of the second valve mechanism with the main body. A base plate provided with a communicating breathing hole;
A piping device characterized in that an opening area of a fluid control unit formed by a valve body of a second valve mechanism body and a valve seat of a main body is changed as the piston moves up and down. In the piping device according to any one of claims 1 to 6,
The connected component is a joint having a first opening and a second opening at one end and the other end, respectively.
The piping device, wherein the piping member is connected to at least one of the first opening and the second opening via the seal ring. The piping device according to claim 12,
The piping device, wherein the joint is any one of a union joint, an expansion joint, and a strainer.

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