JP2006316983A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve appropriate sealing pressure of a seal ring in response to a connected state and a disconnected state of male and female type pipe joint members of a pipe joint used in a pipe of a heat medium. <P>SOLUTION: This pipe joint comprises a cylindrical main body 14, a slide valve element 18 axially displaceable in a fluid passage 12 of the cylindrical main body 14 and displaceable between a closing position and an opening position, the seal ring 20 mounted on the slide valve element and sliding to an inner peripheral face of the cylindrical main body, a coil spring as the coil spring 22 axially pressing the seal ring and compressed when the slide valve element is displaced from the closing position to the opening position to increase pressing force to the seal ring, and a seal ring retaining member 26 for retaining the seal ring against the pressing force of the coil spring. The seal ring 20 is composed of an elastic member elastically deformable in the radial direction of the cylindrical main body by the pressing force of the coil spring. <P>COPYRIGHT: (C)2007,JPO&INPIT

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. For this reason, it is necessary to make the seal ring provided inside the female pipe fitting member and the male pipe fitting member 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. (See Patent Documents 1 and 2)
Japanese Utility Model Publication No. 4-95385 ACT 5-14784

  However, in the pipe joint used for the heat medium piping in the above precision die casting, in order to receive heating at about 300 ° C. during the die casting operation, the seal ring made of resin is subjected to heat shrinkage, etc. In some cases, the sealing function may not be sufficient.

  Moreover, in the seal ring in this type of pipe joint so far, the pressure by the spring is kept almost constant, but the internal fluid is in a high pressure state by connecting the female pipe joint member and the male pipe joint member. It is more appropriate to make the sealing pressure suitable for each state in the case where the seal pressure is removed and in the case where they are removed.

  In view of such a point, the present invention provides the above-described sealing pressure 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. It is an object of the present invention to provide a pipe joint including a seal ring that can perform an appropriate sealing action without being affected by heat shrinkage or the like.

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 provided on the outer peripheral surface of 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 coil spring that presses the seal ring in the axial direction, and is compressed when the slide valve body is displaced from the closed position toward the open position to increase the pressing force on the seal ring. A coil spring;
A seal ring holding member that is provided on the slide valve body, contacts the seal ring, contacts the seal ring pressed by the coil spring, and holds the seal ring in a predetermined position on the slide valve body;
Have
A pipe joint member is provided in which the seal ring is formed of an elastic member that can be elastically deformed in a radial direction of the cylindrical main body by a pressing force of the coil spring.

  In this pipe joint member, the compression of the coil spring is increased by the displacement of the slide valve body from the closed position to the open position, and accordingly, the pressing force applied from the coil spring to the seal ring is increased. When the body is displaced from the open position to the closed position, the pressing force applied from the coil spring to the seal ring is reduced. Therefore, in this pipe joint, it is possible to obtain an appropriate seal pressure according to the closed / open state of the slide valve body. The seal ring member can be formed separately from the slide valve body, and can be fixed to the slide valve body with screws or the like, or can be formed integrally with the slide valve body.

In particular,
The seal ring includes a base that contacts the seal ring holding member;
An outer seal portion extending from the base portion in the direction of the coil spring and slidingly engaging the cylindrical main body at the tip portion;
Have
A seal ring pressing member is provided between the seal ring and the coil spring;
The seal ring pressing member can press the outer seal portion against the inner peripheral surface of the cylindrical body by the pressing force of the coil spring.

More specifically,
The outer seal portion has a sliding portion that swells radially outward at the distal end portion thereof and slidingly engages with the inner peripheral surface of the cylindrical main body,
The seal ring may have an inner seal portion that extends radially inward in the direction of the coil spring from the base portion and presses and engages the outer peripheral surface of the slide valve body while being elastically deformed.
By doing so, even if heat shrinkage occurs at the base of the seal ring that is susceptible to heat, the outer seal portion is properly maintained in sliding engagement with the cylindrical body by the pressing force of the coil spring, and the inner side The seal portion can maintain a pressing engagement state with the outer peripheral surface of the slide valve body by its own elastic deformation force.

Also,
The base of the seal ring is annular,
A stepped portion with which the radially inner portion is engaged is formed on the outer peripheral surface of the slide valve body,
A radially inner portion of the base portion can be sandwiched between the stepped portion and the seal ring holding member.

The slide valve body can be pressed to the closed position by a coil spring via the seal ring and the seal ring holding member.

  In the pipe joint according to the present invention, as described above, it is possible to obtain an appropriate seal pressure according to the closed / open state of the slide valve body. Also, even if heat shrinkage occurs in the base that is susceptible to heat, the outer seal portion and the inner seal portion are each slidably engaged with the required portion of the pipe joint member at the required seal pressure, compared to the conventional one. This makes it possible to maintain a more appropriate sealing action.

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

  FIG. 1 shows a cross-sectional view of a pipe joint member 10 according to the present invention. As shown in the figure, the pipe joint member 10 is a female pipe joint member, and has a cylindrical main body 14 having a fluid passage 12, and a fluid passage 12 of the cylindrical main body 14 along the central axis of the fluid passage. A fixed valve body 16 disposed and fixed; and a closed position that is displaceable in the axial direction of the cylindrical main body 14 and seals the fluid passage 12 by sealingly engaging the fixed valve body 16 (as shown). (Displaced to the left of the position shown in the figure and away from the fixed valve body 16). A slide valve body 18 that is displaceable between the fluid passage and an open position, and an outer peripheral surface of the slide valve body 18. A seal ring 20 that slides with respect to the inner peripheral surface of the cylindrical body as the slide valve body 18 moves in the axial direction, and between the seal ring 20 and the cylindrical body 14. Provided to press the seal ring 20 in the axial direction (to the right as viewed in the figure) A coil spring 22, which is compressed when the slide valve body is displaced leftward from the closed position toward the open position to increase a pressing force against the seal ring; and a coil spring A seal ring pressing member 24 that receives the pressing force of 22 and presses the seal ring 20, and is provided on the slide valve body 18 at a position opposite to the coil spring 22 in the axial direction, abutting against the seal ring 20, and the coil spring And a seal ring holding member 26 that holds the seal ring 20 pressed by 22. The seal ring 20 is formed of an elastic member that can be elastically deformed in the radial direction of the cylindrical main body 14 by a pressing force applied by the seal ring pressing member 24.

  The cylindrical member 14 includes a first cylindrical portion 14-1 and a second cylindrical portion 14-2 generally called an adapter that is screw-engaged with the first cylindrical portion 14-1. Has been. The fixed valve body 16 includes a spider member 16-1 composed of a plurality of members extending radially from the central axis of the fluid passage, and a shank member 16-2 fixed to the spider portion and extending along the axial direction. A substantially disc-shaped seal portion 16-3 is formed at the tip of the shank member 16-2.

  The slide valve body 18 is formed in a cylindrical shape, and an annular sealing portion 18-2 that is hermetically engaged with the seal portion 16-3 of the fixed valve body 16 is provided on the distal end surface thereof.

As shown in FIG. 2, the seal ring 20 includes a base portion 20-1 that contacts the seal ring holding member 26, and extends radially outward from the base portion in the direction of the coil spring 22, and at the tip portion thereof, the cylindrical main body 14. An outer seal portion 20-2 that is slidably engaged with each other, and an inner seal portion that extends radially inward in the direction of the coil spring 22 from the base portion 20-1 and press-engages while elastically deforming the outer peripheral surface of the slide valve body 18. 20-3. In the illustrated example, the outer seal portion 20-2 has a distal end portion 20-4 bulging outward in the radial direction so that the portion is slidably engaged with the inner peripheral surface of the cylindrical main body 14 while being elastically deformed. It has become. Further, the annular base portion 20-1 of the seal ring 20 has a radially inner portion 20-5 engaged with a stepped portion 18-1 formed on the outer peripheral surface of the slide valve body 18. And is fixed in the axial direction by a seal ring holding member 26 screwed to the slide valve body 18.

In the illustrated example, the first cylindrical member 14-1 is provided with a through hole 14-3 provided in the radial direction, and a ball-shaped lock 28 is provided in the through hole. A cylindrical operation sleeve 30 is provided on the outer peripheral surface of the first cylindrical member 14-1, and the operation sleeve 30 is resisted against the coil spring 32 when a male pipe coupling member (not shown) is inserted / removed. In order to displace the locking element 28 radially outward as shown in FIG. 1 and to fix the inserted male pipe joint member, the operating sleeve 30 is moved to the position shown in FIG. Returning and pressing radially inward, the locking element 28 is engaged with a locking recess formed on the outer surface of the male pipe joint member.

  The female pipe joint member 10 according to the present invention is configured as described above. When the male pipe joint member is inserted from the right side as viewed in the figure, the slide valve body 18 becomes the male pipe member. It is displaced to the left by the joint member, and the fluid passage 12 is opened away from the fixed valve member 16 (the seal portion 16-3). At this time, the coil spring 22 is gradually compressed between the seal ring 20 and the cylindrical main body 14, and when the slide valve body 18 reaches its open position (and hence the position at which the coupling of the pipe joint member is completed), The coil spring 22 generates the maximum pressing force, and the outer seal portion 20-2 of the seal ring 20 is pressed against the inner peripheral surface of the cylindrical main body 14 via the seal ring pressing member 24 that has received the pressing force. Accordingly, by properly adjusting the pressing force of the coil spring 22 at that time, it is possible to properly seal the fluid flowing in the fluid passage.

  When the coupling of the pipe joint is released and the slide valve body 18 returns to the closed position shown in the figure, the pressing force of the coil spring 22 decreases, but the pressing force depends on the fluid pressure in the pipe joint at that time. By adjusting to an appropriate one, proper sealing can be performed without applying excessive force to the seal ring 20.

It is a section side view of the pipe joint member concerning the present invention. It is a principal part enlarged view of the pipe joint member of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pipe coupling member 12 Fluid passage 14 Cylindrical main body 14-1 1st cylindrical part 14-2 2nd cylindrical part 14-3 Through-hole 16 Fixed valve body 16-1 Spider part 16-2 Shank part 16-3 Seal Part 18 Slide valve body 18-1 Stepped part 18-2 Annular seal part 20 Seal ring 20-1 Base part 20-2 Outer seal part 20-3 Inner seal part 20-4 The tip part of the outer seal part (sliding part)
22 Coil spring 24 Seal ring pressing member 26 Seal ring holding member 28 Locking element 30 Operation sleeve 32 Coil spring

Claims (5)

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 provided on the outer peripheral surface of 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 coil spring that presses the seal ring in the axial direction, and is compressed when the slide valve body is displaced from the closed position toward the open position to increase the pressing force on the seal ring. A coil spring;
A seal ring holding member that is provided on the slide valve body and contacts the seal ring pressed by the coil spring to hold the seal ring in a predetermined position on the slide valve body;
Have
A pipe joint member, wherein the seal ring is formed of an elastic member that can be elastically deformed in a radial direction of the cylindrical main body by a pressing force of the coil spring. A base where the seal ring contacts the seal ring holding member;
An outer seal portion extending from the base portion in a direction of the coil spring and slidingly engaging the cylindrical body at a tip portion thereof;
A seal ring pressing member is provided between the seal ring and the coil spring;
The pipe joint member according to claim 1, wherein the seal ring pressing member is configured to press the outer seal portion against the inner peripheral surface of the cylindrical main body by a pressing force of the coil spring. The outer seal portion has a sliding portion that swells radially outward at the distal end portion thereof and slidingly engages with the inner peripheral surface of the cylindrical main body,
The seal ring has an inner seal portion that extends radially inward in the direction of the coil spring from the base portion and elastically deforms and press-fits to the outer peripheral surface of the slide valve body. A pipe joint member according to the above. The base of the seal ring is annular,
A stepped portion with which the radially inner portion is engaged is formed on the outer peripheral surface of the slide valve body,
The pipe joint member according to claim 3, wherein a radially inner portion of the base portion is sandwiched between the stepped portion and the seal ring holding member. The pipe joint member according to any one of claims 1 to 4, wherein the slide valve body is pressed to the closed position by the coil spring through the seal ring and the seal ring holding member.

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