JP5411884B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint.

  For example, in precision die casting, a heat medium pipe is provided in the mold, and the heat medium (oil) heated during the die casting operation is supplied and circulated from an external supply source to heat the mold. When the mold is replaced, the pipe joint that connects the heat medium pipe to an external supply source is removed.

  The pipe joint is composed of a female pipe joint member and a male pipe joint member, so that the heat medium inside does not leak to the outside even when they are connected or removed. It is necessary to make it. It is also necessary that the female pipe fitting member and the male pipe fitting member can be removed smoothly while ensuring sealing performance so as not to leak. For this reason, it is necessary to make the seal ring provided inside the female pipe joint member and the male pipe joint member and the holding structure thereof appropriate.

  Various types of seal rings have been developed. The cross-sectional shape is a Y-shaped cross section, and the bifurcated portion of the Y-shape is set between the radially inner member and the radially outer member of the pipe joint member. Then, by applying a pressing member between the bifurcated portions and pressing it with a spring to spread it, the sealing pressure on the radially inner member and the radially outer member is increased, and the heat medium leaks. What is known to prevent this is known.

  The present applicant has no influence on heat shrinkage or the like by setting an appropriate seal pressure in accordance with the state in which the male pipe joint member and the female pipe joint member are connected to each other and the state in which the male pipe joint member is removed. The pipe joint member which can perform an appropriate sealing action without receiving is proposed. (See Patent Document 1)

JP 2006-316983 A

  However, if the amount of compression of the seal ring at the time of assembly is not appropriate, the seal ring may expand in the radial direction and generate excessive pressure on the surface forming the seal. In some cases, the inconvenience of having to re-assemble was caused. Further, there is a possibility that the seal ring may get on the stepped portion for fixing the seal ring and the seal ring may be inclined. In such a case, it is necessary to reassemble the seal ring.

  In the present invention, in view of such a point, the seal ring comes into contact with the surface forming the seal due to the radial expansion of the seal ring, or an excessive pressing force is generated between the seal ring and the seal surface. The main object is to provide such a pipe joint member. Another object of the present invention is to provide a pipe joint member that can reduce the occurrence of displacement of the seal ring.

That is, the present invention
A cylindrical body having a fluid passage;
A slide valve body that is displaceable in the axial direction of the tubular body in the fluid passage of the tubular body, and is displaceable between a closed position that closes the fluid passage and an open position that opens the fluid passage; ,
A seal ring that is attached to the slide valve body and that slides with respect to the inner peripheral surface of the cylindrical body as the slide valve body moves in the axial direction;
A seal ring holding member provided on the slide valve body and holding the seal ring in a predetermined position on the slide valve body;
A pipe joint member comprising:
The seal ring includes an annular base portion including a radially inner portion and a radially outer portion, and an annular portion extending in the axial direction from the radially outer portion of the base portion and slidingly engaging the inner peripheral surface of the cylindrical body. A sliding seal portion,
The slide valve body has an annular step on the outer peripheral surface of the slide valve body that rises radially outward and engages the radially inner portion of the base of the seal ring,
The seal ring holding member includes a holding member main body including a seal ring base engaging surface that sandwiches a base of the seal ring between the step portion of the slide valve body, and an inner peripheral surface of the cylindrical main body. A seal ring expansion inhibiting portion extending between the base portion of the seal ring and
The base portion of the seal ring is sandwiched between the step portion of the slide valve body and the seal ring base engaging surface of the seal ring holding member, so that the space between the slide valve body and the seal ring holding member is reached. A pipe joint member is provided in which a seal is formed in the seal ring and expansion of the seal ring radially outward is inhibited by the seal ring expansion restraining portion.

  In this pipe joint member, since the seal ring is sandwiched between the step provided on the outer peripheral surface of the slide valve body and the seal ring base engaging surface of the seal ring holding member, the slide valve body and the seal ring holding member are A secure seal is ensured between the two. In addition, the base of the seal ring is compressed in the clamping direction during clamping and swells in the radial direction along with it, but there is a seal between the inner peripheral surface of the cylindrical body that is a sliding surface with the seal ring. Since the expansion to the outside in the radial direction is suppressed by the ring expansion inhibiting portion, it is possible to prevent the base portion of the seal ring from contacting the inner peripheral surface. Along with this, there is a possibility that the sliding seal portion of the seal ring will stretch to some extent in the axial direction. This elongation is caused by the sliding resistance between the inner peripheral surface of the cylindrical body and the sliding seal portion. Therefore, it is easy to design the sliding resistance to be appropriate.

The present invention also provides
A cylindrical body having a fluid passage;
A slide valve body that is displaceable in the axial direction of the tubular body in the fluid passage of the tubular body, and is displaceable between a closed position that closes the fluid passage and an open position that opens the fluid passage; ,
A seal ring that is attached to the slide valve body and that slides with respect to the inner peripheral surface of the cylindrical body as the slide valve body moves in the axial direction;
A seal ring holding member provided on the slide valve body and holding the seal ring in a predetermined position on the slide valve body;
A pipe joint member comprising:
The seal ring includes an annular base portion including a radially inner portion and a radially outer portion, and an annular shape that extends in the axial direction from the radially outer portion of the base portion and slidingly engages the inner peripheral surface of the cylindrical body. And a sliding seal portion of
The slide valve body has an annular step on the outer peripheral surface of the slide valve body that rises radially outward and engages the radially inner portion of the base of the seal ring,
The seal ring holding member has a seal ring base engaging surface inclined toward the seal ring toward the outer side in the radial direction, and sandwiches the base of the seal ring between the step part of the slide valve body. And
The base portion of the seal ring is sandwiched between the step portion of the slide valve body and the seal ring base engaging surface of the seal ring holding member, whereby the slide valve body and the seal ring holding member are There is provided a pipe joint member that forms a seal therebetween and is configured to prevent expansion of the seal ring radially outward.

  In this pipe joint member, the seal ring is formed by the step portion provided on the outer peripheral surface of the slide valve body and the seal ring base engaging surface inclined toward the seal ring side toward the radially outer side provided on the seal ring holding member. Since it is clamped, a reliable seal is ensured between the slide valve body and the seal ring holding member. Further, since the seal ring base engaging surface is formed so as to cover the radially outer side of the base of the seal ring, the base of the seal ring comes into contact with the inner peripheral surface while suppressing the expansion of the base of the seal ring outward in the radial direction. It becomes possible not to do. Along with this, there is a possibility that the sliding seal portion of the seal ring will stretch to some extent in the axial direction. This elongation is caused by the sliding resistance between the inner peripheral surface of the cylindrical body and the sliding seal portion. Therefore, it is easy to design the sliding resistance to be appropriate. Furthermore, since a clamping force radially inward with respect to the seal ring is also generated, and the force that presses the base of the seal ring against the outer peripheral surface of the slide valve body also acts, the seal ring may ride on the stepped portion of the slide valve body Can also be reduced.

  Specifically, the step portion of the slide valve body may be raised to a position adjacent to the sliding seal portion of the seal ring.

  Since the stepped portion of the slide valve body has a sufficient height, the base portion of the seal ring can be more securely clamped, so that the sealing performance of the base portion can be made stronger. . In addition, it is possible to further reduce the possibility that the seal ring rides on the step portion and is detached during assembly.

The present invention also provides
A cylindrical main body having a first cylindrical member and a second cylindrical member that are interconnected and define a fluid passage extending in the axial direction;
A slide valve body that is displaceable in the axial direction of the tubular body in the fluid passage of the tubular body, and is displaceable between a closed position that closes the fluid passage and an open position that opens the fluid passage; ,
A seal ring that is attached to the cylindrical main body and slides with respect to the outer peripheral surface of the slide valve body as the slide valve body moves in the axial direction;
A pipe joint member comprising:
The seal ring includes an annular base portion including a radially inner portion and a radially outer portion, and a sliding seal portion extending from the base portion in the axial direction and slidingly engaging with an outer peripheral surface of the slide valve body. ,
The first cylindrical member of the cylindrical body rises radially inward on the inner peripheral surface of the end adjacent to the second cylindrical member and engages with the radially outer portion of the base of the seal ring. Part
The second cylindrical member includes a second cylindrical member main body including a seal ring base engaging surface that sandwiches a base portion of the seal ring between a step portion of the first cylindrical member and the slide valve body. A seal ring expansion inhibiting portion extending between an outer peripheral surface of the first ring member and a base portion of the seal ring, wherein the base portion of the seal ring is a step portion of the first tubular member and a seal ring base portion of the second tubular member. A seal is formed between the first tubular member and the second tubular member by being sandwiched between the engagement surfaces, and expansion of the seal ring inward in the radial direction is performed on the seal ring. Provided is a pipe joint member that is restrained by an expansion restraining portion.

  In this pipe joint member, the seal ring is sandwiched between the step provided on the inner peripheral surface of the first cylindrical main body and the seal ring base engaging surface of the second cylindrical main body. A reliable seal is ensured between the first cylindrical body and the second cylindrical body. In addition, the base portion of the seal ring is compressed in the clamping direction at the time of clamping, and accordingly, expands in the radial direction, but the seal ring expansion restraining portion located between the outer peripheral surface of the slide valve body that becomes the sliding surface Since expansion to the outside in the radial direction is suppressed, it is possible to prevent the base portion of the seal ring from coming into contact with the outer peripheral surface or causing excessive pressing. Along with this, there is a possibility that the sliding seal portion of the seal ring will stretch to some extent in the axial direction, but this elongation is caused by the sliding resistance between the outer peripheral surface of the slide valve body and the sliding seal portion. Does not have a substantial effect, so that it is easy to design the sliding resistance to be appropriate. Furthermore, since the seal ring is attached not to the slide valve body that is the movable part but to the cylindrical body that is the fixed part, the structure of the slide valve body can be simplified.

The present invention further includes
A cylindrical main body having a first cylindrical member and a second cylindrical member that are interconnected and define a fluid passage extending in the axial direction;
A slide valve body that is displaceable in the axial direction of the tubular body in the fluid passage of the tubular body, and is displaceable between a closed position that closes the fluid passage and an open position that opens the fluid passage; ,
A seal ring that is attached to the cylindrical main body and slides with respect to the outer peripheral surface of the slide valve body as the slide valve body moves in the axial direction;
A pipe joint member comprising:
The seal ring has an annular base portion including a radially inner portion and a radially outer portion, and a sliding seal portion extending from the base portion in the axial direction and slidingly engaging the outer peripheral surface of the slide valve body. And
The first tubular member of the tubular body rises radially inward from the inner peripheral surface of the end adjacent to the second tubular member and engages with the radially outer portion of the base portion of the seal ring. Part
The second cylindrical member sandwiches the base portion of the seal ring between the step portion of the first cylindrical member and the seal ring base engaging surface inclined toward the seal ring toward the radially inner side. Have
The base portion of the seal ring is sandwiched between the step portion of the first tubular member and the seal ring base engaging surface of the second tubular member, whereby the first tubular member and the second tubular member are Provided is a pipe joint member that forms a seal with a tubular member and that suppresses expansion of the seal ring inward in the radial direction.

  In this pipe joint member, a step portion provided on the inner peripheral surface of the first cylindrical main body and a seal ring base engaging surface inclined toward the seal ring toward the radially inner side provided in the second cylindrical main body As a result, the seal ring is sandwiched between the first cylindrical main body and the second cylindrical main body. Further, since the seal ring base engaging surface is formed so as to cover the radially inner side of the base of the seal ring, expansion of the base of the seal ring to the inner side in the radial direction is suppressed, so that the base of the seal ring is placed on the outer peripheral surface. It is possible to prevent contact or excessive pressing. Along with this, there is a possibility that the sliding seal portion of the seal ring will stretch to some extent in the axial direction, but this elongation is caused by the sliding resistance between the outer peripheral surface of the slide valve body and the sliding seal portion. Does not have a substantial effect, so that it is easy to design the sliding resistance to be appropriate. Furthermore, since the seal ring is attached not to the slide valve body that is the movable part but to the cylindrical body that is the fixed part, the structure of the slide valve body can be simplified. In addition, there is also a possibility that the seal ring may ride on the stepped portion because a force of pressing radially outward with respect to the seal ring is also generated and a force pressing the base portion of the seal ring against the inner peripheral surface of the first cylindrical main body also works. It can also be reduced.

  Specifically, the step portion of the first tubular member can be raised to a position adjacent to the sliding seal portion of the seal ring.

  Since the step of the first tubular member has a sufficient height, the base of the seal ring can be more securely clamped, so that the base can be more firmly sealed. It becomes. In addition, it is possible to greatly reduce the possibility that the seal ring rides on the step portion and is detached during assembly.

1 is a cross-sectional view of a pipe joint member according to a first embodiment of the present invention. It is an expanded sectional view of the seal ring part of the pipe joint member of FIG. It is a principal part expanded sectional view of the pipe joint member which concerns on the 2nd Embodiment of this invention. It is a principal part expanded partial sectional view of the pipe joint member which concerns on the 3rd Embodiment of this invention. It is sectional drawing of the pipe joint member which concerns on the 4th Embodiment of this invention. FIG. 6 is an enlarged cross-sectional view of a seal ring part of the pipe joint member of FIG. 5. It is sectional drawing of the pipe joint member which concerns on the 5th Embodiment of this invention.

  Hereinafter, an embodiment of a pipe joint member concerning the present invention is described based on a drawing.

  A pipe joint member 100 according to the first embodiment of the present invention shown in FIGS. 1 and 2 is a female pipe joint member, and includes a cylindrical main body 110 having a fluid passage 112 and a fluid passage 112 of the cylindrical main body 110. The slide valve body 120 is provided so as to be displaceable in the axial direction of the cylindrical main body 110, and the fixed valve is disposed and fixed along the central axis of the fluid flow path in the fluid passage 112 of the cylindrical main body. And a seat 170. On the outer peripheral surface of the slide valve body 120, a seal ring 130, a seal ring holding member 140 for fixing and holding the seal ring, and a sliding seal portion 133 of the seal ring by pressing the seal ring 130 are attached to the cylindrical main body. A seal ring pressing member 150 that is pressed against the inner peripheral surface 114 of the 110 is provided, and the seal ring pressing member 150 is pressed toward the seal ring 130 by a coil spring 160.

  The seal ring 130 has an annular base 132 composed of a radially inner portion 134 and a radially outer portion 135, and the sliding seal 133 extends axially from the radially outer portion 134 of the base 132. The base portion 132 has a rectangular cross section, and has four surfaces, that is, an inner peripheral surface 136, a first annular side surface 137, an outer peripheral surface 138, and a second annular side surface 139. As will be described in detail later, these four surfaces form a reliable seal by being closely attached to the corresponding surfaces of the slide valve body 120 and the seal ring holding member 140. The sliding seal portion 133 is slidably engaged with the inner peripheral surface 114 of the cylindrical main body 110 and forms a seal with the inner peripheral surface 114.

  The slide valve body 120 has a first annular outer peripheral surface 121 that supports the seal ring pressing member 150 so as to be slidable in the axial direction, and has a slightly smaller diameter than the first annular outer peripheral surface, and a female thread portion 142 of the seal ring holding member 140. And a second annular outer peripheral surface 122 provided with a male threaded portion 127 to be screw-engaged, and an annular protrusion 123 provided between the first annular outer peripheral surface and the second annular outer peripheral surface. The annular protrusion 123 protrudes radially outward, and protrudes to a position adjacent to the sliding seal portion 133 of the seal ring 130 so that the base 132 of the seal ring 130 is sealingly engaged with the second annular outer peripheral surface 122. Step 124 is provided.

  Further, the tip end 125 of the slide valve body 120 is provided with an annular sealing portion 126 sandwiched between the seal ring holding member 140. When the slide valve body 120 is in the closed position, the annular sealing portion 126 seals and engages with the seal portion 176 of the fixed valve seat 170 to close the fluid passage 112, and when the slide valve body 120 is in the open position, the fixed valve seat. The fluid passage 112 is opened away from the seal portion 176 of 170.

  The holding member main body 144 of the seal ring holding member 140 has a seal ring base engaging surface 146 that faces the second annular side surface 139 of the seal ring 130, and extends radially on the left side of the drawing in the axial direction. And a seal ring expansion inhibiting portion 148. The inner surface of the seal ring expansion inhibiting portion 148 faces the outer peripheral surface 138 of the base portion 132 of the seal ring, and the outer surface is a surface that slides with respect to the inner peripheral surface 114 of the cylindrical main body. In this embodiment, the seal ring expansion inhibiting portion 148 is sized to cover the entire outer peripheral surface 138 of the base portion 132 of the seal ring, but appropriately inhibits expansion of the seal ring base portion 132 in the radial direction. If possible, it may be sized to cover only a part of it. Furthermore, the right end of the figure has an annular convex portion 149 for fixing the annular sealing portion 126 to the tip 125 of the slide valve body.

  With the above-described configuration, the four surfaces 136, 137, 138, 139 of the base portion 132 of the seal ring 130 correspond to the second annular outer peripheral surface 122 of the slide valve body 120, the step portion 124, and the seal ring holding member 140, respectively. The seal ring base engaging surface 146 and the seal ring expansion restraining portion 148 are in contact with each other, so that the possibility that the seal ring 130 is displaced at the time of assembly or the like becomes extremely low.

  The base portion 132 of the seal ring 130 is pressed in the axial direction by the step portion 124 of the slide valve body 120 and the seal ring base engagement surface 146 of the seal ring holding member 140, and sealing with the slide valve body 120 is achieved. At this time, the base portion 132 of the seal ring 130 is compressed in the axial direction and tends to expand in the radial direction. This expansion in the radial direction is suppressed by the seal ring expansion suppressing portion 148 and the second annular outer peripheral surface 122 and is expanded. The volume of is allowed to escape in the axial direction. Thereby, the base 132 is prevented from being pressed against the inner peripheral surface 114 of the cylindrical main body, and the smooth movement of the slide valve body 120 is maintained. Further, due to the expansion of the base 132 of the seal ring 130 in the radial direction, a seal is also formed between the base 132 of the seal ring, the seal ring expansion inhibiting portion 148 and the second annular outer peripheral surface 122. As compared with the case where the seal is formed by only the two surfaces of the step portion 124 and the seal ring base engaging surface 146, it is possible to secure a stronger sealing performance.

  In the state where the seal ring 130 is fixed by the slide valve body 120 and the seal ring holding member 140 as described above, the sliding seal portion 133 of the seal ring 130 is opened from the opening between the step portion 124 and the seal ring expansion suppressing portion 148. It extends in the axial direction. When the base 132 of the seal ring 130 is compressed, a part of the base 132 expands from the opening in the sliding direction of the slide valve body 120, that is, in the axial direction. The sealing property with the inner peripheral surface 114 of the cylindrical main body 110 is hardly affected.

  Further, when used in a high temperature environment, the seal ring 130 expands due to thermal expansion. However, according to the seal ring holding structure in this embodiment, the base 132 of the seal ring 130 contacts the inner peripheral surface 114 of the cylindrical main body 110. There is nothing. Furthermore, although the sliding seal part 133 expands in the axial direction, it does not affect the sealing performance as described above. That is, it is possible to ensure both slidability and sealing performance of the slide valve body 120 even in a high temperature environment.

  As shown in FIG. 1, the pipe joint member 100 according to the present embodiment is provided with a through hole 116 provided in the cylindrical body 110 in the radial direction, and a ball-shaped lock 182 is inserted into the through hole 116. Has been. A cylindrical operation sleeve 184 is provided on the outer peripheral surface of the cylindrical main body 110.

  When inserting a male pipe joint member (not shown), the operating sleeve 184 is moved to the left side of the figure against the coil spring 186 so that the lock 182 can be displaced radially outward and the male pipe joint member is inserted. At this time, the slide valve body 120 is moved to the open position on the left side of the figure by the male pipe joint member, and the fluid passage is opened. Accordingly, since the coil spring 160 is compressed, the pressing force by the coil spring 160 increases, and the force with which the seal ring pressing member 150 presses the sliding seal portion 133 of the seal ring against the inner peripheral surface 114 of the cylindrical body also increases. Become. Therefore, by appropriately adjusting the pressing force of the coil spring 160 at that time, it is possible to perform an appropriate seal against the fluid flowing in the fluid passage 112.

  When pulling out the male pipe joint member, the operating sleeve 184 is moved to the left in the figure against the coil spring 186 so that the lock 182 can be displaced radially outward, and the male pipe joint member is pulled out. When the male pipe joint member is pulled out, the slide valve body 120 is moved to the closed position by the coil spring 160, and the annular sealing portion 126 is pressed against the seal portion 176 of the fixed valve seat 170.

  FIG. 3 shows a pipe joint member 200 according to the second embodiment of the present invention, and corresponds to the components shown with reference numerals in the 100s in the pipe joint member 100 according to the first embodiment. Components to be designated are indicated by the same reference numbers in the 200s. The pipe joint member 200 according to this embodiment is substantially the same as the pipe joint member 100 according to the first embodiment, but the seal ring expansion suppression portion 248 is formed separately from the holding member main body 244. It is different. The separate seal ring expansion inhibiting portion 248 is a ring-shaped member having an outer periphery slightly smaller than the inner peripheral surface of the cylindrical main body 210.

  FIG. 4 shows a pipe joint member 300 according to the third embodiment of the present invention, and acts on the components shown with reference numerals in the 100s in the pipe joint member 100 according to the first embodiment. Corresponding components are indicated by the same reference numbers in the 300s. In the pipe joint member 300 according to the present embodiment, the seal ring base engaging surface 346 of the seal ring holding member 340 is inclined radially outward toward the seal ring side, and the pipe joint member 100 according to the first embodiment. This is different in that the function of the seal ring expansion inhibiting portion 148 is also provided. That is, the seal ring base engaging surface 346 in this embodiment clamps the seal ring between the step 324 of the slide valve body 320 and expands the base of the seal ring to the outside in the radial direction at the time of clamping. It also has a function to suppress this.

  The base portion 332 of the seal ring has an inclined outer peripheral surface 338 that contacts the inclined seal ring base engaging surface 346 and has a triangular cross section. The sliding seal portion 333 of the seal ring extends in the axial direction from the radially outer portion of the base portion 332 of the seal ring, and forms a seal with the inner peripheral surface 314 of the cylindrical main body 310.

  Since the seal ring base engaging surface 346 and the seal ring base 332 are configured as described above, the seal ring base 332 receives the axial force on the step 324 of the slide valve body 320 and receives the first force. The one annular side surface 337 is pressed, and the inner peripheral surface 336 is pressed by receiving a radial force against the first annular outer peripheral surface 321 of the slide valve body. Thereby, since the seal is formed by the two surfaces 124 and 122 on the slide valve body 320 side, a stronger seal can be formed. Further, a radially inward force is also applied to the base portion 332 of the seal ring, and the base portion 332 of the seal ring is pressed against the second annular outer peripheral surface 322 of the slide valve body. It is also possible to reduce the property.

  In the present embodiment shown in FIG. 4, the inclination of the seal ring base engaging surface 346 is linear, but it may be a curved surface.

  5 and 6 show a pipe joint member 400 according to a fourth embodiment of the present invention. The pipe joint member 100 according to the first embodiment is shown with reference numerals in the 100s. Components that operatively correspond to elements are indicated by the same reference numbers in the 400s. In the pipe joint member 400 according to the present embodiment, the seal ring is fixed to the cylindrical main body 410, and the outer peripheral surface 428 of the slide valve body is slidably engaged with the seal ring. It differs from the pipe joint member 100,200,300 which concerns on 3rd Embodiment.

  That is, the pipe joint member 400 includes a first tubular member 402 and a second tubular member 404 having a female screw portion 442 that is screw-engaged with a male screw portion 427 formed on the outer peripheral surface of the first tubular member 402. A cylindrical main body 410, and a fixed valve seat 470 that is displaceable in the axial direction within the fluid passage 412 of the cylindrical main body and is fixed to the cylindrical main body 410. A slide valve body 420 that opens and closes the fluid passage 412, a base portion 432 fixed between the first tubular member 402 and the second tubular member 404, and a sliding seal portion 433 extending in the axial direction from the base portion, A seal ring 430 that is slidably engaged with the outer peripheral surface of the slide valve body that is displaced in the axial direction.

  The first cylindrical member 402 of the cylindrical main body 410 has a first annular inner peripheral surface 421 that is slidably engaged with the seal ring pressing member 450 on the inner peripheral surface of the end portion adjacent to the second cylindrical member 404, and a seal. The ring 430 includes a second annular inner peripheral surface 322 that contacts the outer peripheral surface 438 of the base 432 of the ring 430, and an annular protrusion 423 provided between the first annular inner peripheral surface 421 and the second annular inner peripheral surface 422. The second tubular member 404 has the same function as the seal ring holding member 144 in the first embodiment with respect to the seal ring 430, and the step 424 formed by the annular protrusion 423 of the first tubular member 402. A seal ring base engaging surface 446 for sandwiching the base portion 432 of the seal ring 430 therebetween, and a seal ring expansion inhibiting portion 448 extending between the outer peripheral surface 428 of the slide valve body 420 and the base portion 432 of the seal ring 430. And the base portion 432 of the seal ring 430 is sandwiched between the step portion 424 of the first tubular member 402 and the seal ring base engaging surface 446 of the second tubular member 404, whereby the first tube A seal is formed between the cylindrical member 402 and the second tubular member 404, and the expansion of the base portion 432 of the seal ring 430 in the radial direction is caused at that time. Seal ring expansion inhibiting unit 448 is adapted to suppress.

  In this embodiment, a pressing coil spring 462 that presses the sliding seal portion 433 of the seal ring 430 via the seal ring pressing member 450 is provided separately from the coil spring 460 for returning the slide valve body 420 to the closed position. ing. By using different coil springs, the pressing force to the sliding seal portion 433 is always a constant force regardless of the position of the slide valve body 420. Such a configuration is useful in applications where it is necessary to always obtain a constant sealing force regardless of the closed state and the open state.

  FIG. 7 shows a pipe joint member 500 according to a fifth embodiment of the present invention, and acts on the components indicated by reference numerals in the 400s in the pipe joint member 400 according to the fourth embodiment. Corresponding components are indicated by the same reference numbers in the 500s. In the pipe joint member 500 according to the present embodiment, the seal ring base engaging surface 546 of the second cylindrical member 504 is inclined toward the seal ring side inward in the radial direction, and the pipe joint member according to the fourth embodiment. 400 is different in that the functions of the seal ring expansion inhibiting portion 448 are also provided at the same time. That is, the seal ring base engaging surface 546 in this embodiment holds the base 532 of the seal ring 530 between the step 524 of the slide valve body 520 and the radial direction of the base of the seal ring at the time of clamping. It also has a function to suppress inward expansion.

  That is, in the pipe joint member 500 according to the present embodiment, the seal ring base engagement surface 346 of the pipe joint member 300 according to the third embodiment is used as the seal ring base engagement of the pipe joint member 400 according to the fourth embodiment. This is adopted for the surface 446.

Pipe joint member 100; Cylindrical body 110; Fluid passage 112; Inner circumferential surface 114; Through hole 116; Slide valve body 120; First annular outer circumferential surface 121; Second annular outer circumferential surface 122; An end seal 125; an external thread portion 127; a seal ring 130; a base 132; a sliding seal portion 133; a radially inner portion 134; a radially outer portion 135; an inner peripheral surface 136; a first annular side surface 137; Surface 138; second annular side surface 139; seal ring holding member 140; female thread portion 142; holding member body 144; seal ring base engaging surface 146; seal ring expansion restraining portion 148; annular convex portion 149; seal ring pressing member 150; Coil spring 160; fixed valve seat 170; seal 176; lock 182; operation Coil spring 186; Pipe joint member 200; Cylindrical body 210; Seal ring holding member 240; Male thread part 242; Holding member body 244; Seal ring base engaging surface 246; Seal ring expansion restraint part 248; Pipe joint member 300; slide valve body 320; second annular outer peripheral surface 322; step 324; seal ring 330; base 332; sliding seal portion 333; inner peripheral surface 336; first annular side surface 337; Seal ring holding member 340; Seal ring base engaging surface 346; Pipe joint member 400; First tubular body 402; Second tubular body 404; Cylindrical body 410; Fluid passage 412; Through-hole 416; First annular inner peripheral surface 421; second annular inner peripheral surface 422; annular protrusion 423; 424; tip 425; annular seal 426; male thread 427; outer peripheral surface 428; seal ring 430; base 432; sliding seal 433; radial inner portion 434; radial outer portion 435; 2nd annular side surface 439; female thread portion 442; second tubular member body 444; seal ring base engaging surface 446; seal ring expansion restraint portion 448; annular convex portion 449; seal ring pressing member 450; coil spring 460; pressing coil spring 462; fixed valve seat 470; seal portion 476; lock 482; operation sleeve 484; coil spring 486; fitting member 500; slide valve body 520; step portion 524; A seal ring base engaging surface 546;

Claims (6)

A cylindrical body having a fluid passage;
A slide valve body that is displaceable in the axial direction of the tubular body in the fluid passage of the tubular body, and is displaceable between a closed position that closes the fluid passage and an open position that opens the fluid passage; ,
A seal ring that is attached to the slide valve body and that slides with respect to the inner peripheral surface of the cylindrical body as the slide valve body moves in the axial direction;
A seal ring holding member provided on the slide valve body and holding the seal ring in a predetermined position on the slide valve body;
A pipe joint member comprising:
The seal ring includes an annular base portion including a radially inner portion and a radially outer portion, and an annular shape that extends in the axial direction from the radially outer portion of the base portion and slidingly engages the inner peripheral surface of the cylindrical body. And a sliding seal portion of
The slide valve body has an annular step on the outer peripheral surface of the slide valve body that rises radially outward and engages the radially inner portion of the base of the seal ring,
The seal ring holding member includes a holding member main body including a seal ring base engaging surface that sandwiches a base of the seal ring between the step portion of the slide valve body, and an inner peripheral surface of the cylindrical main body. A seal ring expansion inhibiting portion extending between the base portion of the seal ring and
The base portion of the seal ring is sandwiched between the step portion of the slide valve body and the seal ring base engaging surface of the seal ring holding member, so that the space between the slide valve body and the seal ring holding member is reached. A pipe joint member that forms a seal on the seal ring and that is prevented from expanding radially outward by the seal ring. A cylindrical body having a fluid passage;
A slide valve body that is displaceable in the axial direction of the tubular body in the fluid passage of the tubular body, and is displaceable between a closed position that closes the fluid passage and an open position that opens the fluid passage; ,
A seal ring that is attached to the slide valve body and that slides with respect to the inner peripheral surface of the cylindrical body as the slide valve body moves in the axial direction;
A seal ring holding member provided on the slide valve body and holding the seal ring in a predetermined position on the slide valve body;
A pipe joint member comprising:
The seal ring includes an annular base portion including a radially inner portion and a radially outer portion, and an annular shape that extends in the axial direction from the radially outer portion of the base portion and slidingly engages the inner peripheral surface of the cylindrical body. And a sliding seal portion of
The slide valve body has an annular step on the outer peripheral surface of the slide valve body that rises radially outward and engages the radially inner portion of the base of the seal ring,
The seal ring holding member has a seal ring base engaging surface inclined toward the seal ring toward the outer side in the radial direction, and sandwiches the base of the seal ring between the step part of the slide valve body. And
The base portion of the seal ring is sandwiched between the step portion of the slide valve body and the seal ring base engaging surface of the seal ring holding member, whereby the slide valve body and the seal ring holding member are A pipe joint member which forms a seal therebetween and prevents expansion of the seal ring outward in the radial direction.   The pipe joint member according to claim 1 or 2, wherein the step portion of the slide valve body rises to a position adjacent to the sliding seal portion of the seal ring. A cylindrical main body having a first cylindrical member and a second cylindrical member that are interconnected and define a fluid passage extending in the axial direction;
A slide valve body that is displaceable in the axial direction of the tubular body in the fluid passage of the tubular body, and is displaceable between a closed position that closes the fluid passage and an open position that opens the fluid passage; ,
A seal ring that is attached to the cylindrical main body and slides with respect to the outer peripheral surface of the slide valve body as the slide valve body moves in the axial direction;
A pipe joint member comprising:
The seal ring has an annular base portion including a radially inner portion and a radially outer portion, and a sliding seal portion extending from the base portion in the axial direction and slidingly engaging the outer peripheral surface of the slide valve body. And
The first tubular member of the tubular body rises radially inward from the inner peripheral surface of the end adjacent to the second tubular member and engages with the radially outer portion of the base portion of the seal ring. Part
The second cylindrical member includes a second cylindrical member main body including a seal ring base engaging surface that sandwiches a base portion of the seal ring between a step portion of the first cylindrical member and the slide valve body. A seal ring expansion inhibiting portion extending between the outer peripheral surface of the seal ring and the base of the seal ring,
The base portion of the seal ring is sandwiched between the step portion of the first tubular member and the seal ring base engaging surface of the second tubular member, whereby the first tubular member and the second tube A pipe joint member which forms a seal with a cylindrical member and is inhibited from expanding radially inward of the seal ring by the seal ring expansion inhibiting portion. A cylindrical main body having a first cylindrical member and a second cylindrical member that are interconnected and define a fluid passage extending in the axial direction;
A slide valve body that is displaceable in the axial direction of the tubular body in the fluid passage of the tubular body, and is displaceable between a closed position that closes the fluid passage and an open position that opens the fluid passage; ,
A seal ring that is attached to the cylindrical main body and slides with respect to the outer peripheral surface of the slide valve body as the slide valve body moves in the axial direction;
A pipe joint member comprising:
The seal ring has an annular base portion including a radially inner portion and a radially outer portion, and a sliding seal portion extending from the base portion in the axial direction and slidingly engaging the outer peripheral surface of the slide valve body. And
The first tubular member of the tubular body rises radially inward from the inner peripheral surface of the end adjacent to the second tubular member and engages with the radially outer portion of the base portion of the seal ring. Part
The second cylindrical member sandwiches the base portion of the seal ring between the step portion of the first cylindrical member and the seal ring base engaging surface inclined toward the seal ring toward the radially inner side. Have
The base portion of the seal ring is sandwiched between the step portion of the first tubular member and the seal ring base engaging surface of the second tubular member, whereby the first tubular member and the second tubular member are A pipe joint member that forms a seal with a tubular member and is configured to suppress expansion of the seal ring inward in the radial direction.   The pipe joint member according to claim 4 or 5, wherein the step portion of the first tubular member rises to a position adjacent to the sliding seal portion of the seal ring.

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