JP2013249882A - Pipe body-sealing structure, and pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe body-sealing structure and a pipe joint, enabling water stop at a tip surface.SOLUTION: A pipe joint 10 includes: a body member 12 formed to have a cylindrical shape and having a flow passage R configured on a cylinder inner side; and an annular movable member 30 arranged on an inner periphery of the body member 12 and having an opposing part 32 formed therein and opposing to a tip surface 40A of a pipe 40. An inner seal member 35B is nipped between the opposing part 32 of the movable member 30 and the tip surface 40A of the pipe 40 and seals a space between the pipe 40 and the movable member 30. An outer seal member 35A is disposed between the movable member 30 and the body member 12 on a radial outer side from the inner seal member 35B and seals a space between the movable member 30 and the body member 12.

Description

  The present invention relates to a pipe seal structure and a pipe joint, and more particularly to a pipe seal structure when connecting a pipe for fluid and a pipe joint to which the pipe seal structure is applied.

  Conventionally, various pipe joints connected to a fluid pipe are known. In these pipe joints, various seal structures have been proposed in order to prevent fluid leakage at the connecting portion. For example, in the pipe joint of patent document 1, water stop is performed between the outer peripheral surface of a pipe body, and the inner surface of a pipe joint main body. Moreover, in the pipe joint of patent document 2, water stop is performed between the internal peripheral surface of a pipe body, and the outer surface of a joint main body.

  However, no technology has been proposed at present for water stopping at other parts of the tube.

JP-A-2005-106247 JP 2004-138205 A

  The present invention has been made in view of the above-described facts, and an object of the present invention is to provide a pipe seal structure and a pipe joint capable of stopping water at the distal end surface of the pipe.

  In order to solve the above-mentioned problem, the tubular body seal structure according to claim 1 is formed into a tubular shape, a flow path is formed inside the tubular body, and the tubular body is inserted inside one end in the tubular axial direction. And a movable member that is annularly disposed on the inner periphery of the main body member, has a facing portion that faces the distal end surface of the tubular body, and is restricted from moving away from the tubular body, and the movable member An inner seal member that is sandwiched between the opposing portion of the tube body and the distal end surface of the tube body, and seals between the tube body and the movable member, and between the movable member and the main body member, and the inner seal. An outer seal member that is disposed radially outside the member and seals between the movable member and the main body member.

  In the tubular body seal structure according to claim 1, the facing portion of the movable member is disposed to face the distal end surface of the tubular body, and the inner seal member is disposed between the opposed portion and the distal end surface of the tubular body. ing. Further, an outer seal member is disposed between the movable member and the main body member and on the radially outer side than the inner seal member.

  When connecting the tubular bodies, the tubular body is inserted inside one end of the main body member and brought into contact with the inner seal member. When the flow paths of the tube body and the main body member are filled with fluid, the internal pressure increases, and pressure acts on the inner seal member and the outer seal member. At this time, since the outer seal member is disposed radially outside the inner seal member, a higher force (axial force) is applied to the outer seal member side than the inner seal member side, and the movable member is the tip of the tube body. It is pushed to the surface side. Thereby, between the front end surface of a pipe body and an opposing part can be reliably sealed by an inner seal member.

  The tubular body seal structure according to claim 2, wherein the movable member has an insertion portion fitted to an inner periphery of the tubular body at a distal end portion on the tubular body side, and the opposed portion and the insertion portion A step portion is formed between them.

  According to the tubular body seal structure according to the second aspect, since the insertion portion is fitted inside the tubular body, the shape of the connecting portion of the tubular body can be maintained. Moreover, since the step part is formed between the insertion part and the opposing part, the position shift of the inner seal member can be suppressed by engaging the inner seal member with the step part.

  The tubular body seal structure according to claim 3, wherein a restriction convex portion for restricting movement of the movable member in a direction away from the tubular body is formed on an inner periphery of the main body member. To do.

  According to the tubular body seal structure according to the third aspect, the movement of the movable member in the direction away from the tubular body can be easily restricted by forming the restricting convex portion.

  The tube seal structure according to claim 4 is characterized in that the outer seal member is disposed on an outer peripheral surface of the facing portion.

  According to the tubular body seal structure according to the fourth aspect, by arranging the outer seal member on the outer peripheral surface of the facing portion, the movable member can be attached to the main body member using the outer seal member even when the tubular body is not connected. Can be held inside.

  The tubular seal structure according to claim 5 is characterized in that an outer peripheral surface of the insertion portion of the movable member is formed with a retaining protrusion that can bite into the inner periphery of the tubular body.

  According to the tubular body seal structure according to claim 5, the tubular body and the movable member move away from each other after the tubular bodies are connected and before the flow paths of the tubular body and the main body member are filled with fluid. Is suppressed, and the adhesiveness between the tubular body and the movable member can be ensured when the fluid starts to flow (before the movable member is sufficiently pressed toward the distal end surface of the tubular body by the internal pressure of the fluid).

  According to a sixth aspect of the present invention, the tubular body seal structure includes an urging member that urges the movable member toward the distal end surface of the tubular body.

  According to the tubular body seal structure of the sixth aspect, since the movable member is urged toward the distal end surface of the tubular body by the urging member, when the fluid starts to flow (the movable member is The adhesiveness between the tubular body and the movable member can be ensured before it is sufficiently pressed toward the distal end surface.

  The pipe joint according to claim 7 is a direction in which the pipe seal structure according to any one of claims 1 to 6 and the main body member of the pipe inserted inside the main body member are pulled out. And a restricting member for restricting movement to the.

  According to the pipe joint according to the seventh aspect, it is possible to reliably seal between the distal end surface of the pipe body and the facing portion by the inner seal member while holding the pipe body inside the main body member by the restriction member.

  According to the pipe body seal structure and the pipe joint according to the present invention, water can be stopped at the tip end face of the pipe body.

It is a half cut sectional view of the pipe joint concerning a 1st embodiment of the present invention. It is a perspective view of the movable member of the pipe joint concerning a 1st embodiment of the present invention. It is a connection part of the pipe joint which concerns on 1st Embodiment of this invention, and a pipe, Comprising: (A) shows the state where the internal pressure by a fluid is not acting, (B) shows the state where the internal pressure by a fluid is acting FIG. It is a pipe joint which concerns on 1st Embodiment of this invention, Comprising: It is a half-cut sectional view in the state by which the fluid was satisfy | filled. It is a partially expanded sectional view of the pipe joint which concerns on the modification of 1st Embodiment of this invention. It is a partially expanded sectional view of the pipe joint which concerns on the other modification of 1st Embodiment of this invention. It is a half section view of the pipe joint concerning a 2nd embodiment of the present invention. It is a connection part of the pipe joint which concerns on 2nd Embodiment of this invention, and a pipe, Comprising: (A) shows the state in which the internal pressure by a fluid is not acting, (B) is the state in which the internal pressure by a fluid is acting FIG. It is a pipe joint which concerns on 2nd Embodiment of this invention, Comprising: It is a half-cut sectional view in the state by which the fluid was satisfy | filled. It is a half cut sectional view of the pipe joint which concerns on the modification of 2nd Embodiment of this invention.

  [First Embodiment]

  A first embodiment of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a half cutaway view of a pipe joint 10 as a pipe connector according to an embodiment of the present invention. Reference symbol S indicates the central axis of the pipe joint 10.

  The pipe joint 10 includes a main body member 12, a sleeve 14, and a movable member 30. The main body member 12 is cylindrical. An engagement convex portion 20 that engages with the sleeve 14 is formed on the outer periphery of the one end portion 12A of the main body member 12, and a male screw 22 is formed on the outer periphery of the other end portion 12B. A tube body 50 having an internal thread is connected to the other end portion 12B. Further, a nut portion 24 for holding with a tool is formed on the outer periphery of the intermediate portion of the main body member 12 in the axial direction S. A flow path R is formed inside the cylinder of the main body member 12. The flow path R has a larger diameter on the one end 12 </ b> A side than on the other end 12 </ b> B side, and a restriction convex portion 26 is formed on the inner periphery corresponding to the nut portion 24. The restricting convex portion 26 protrudes toward the flow path R and has a tapered shape with a small inner diameter on the one end portion 12A side. The pipe 40 connected to the pipe joint 10 is inserted inside the one end 12 </ b> A side of the main body member 12.

  The sleeve 14 has a cylindrical shape and is disposed on the outer periphery of the main body member 14. The sleeve 14 has a smaller diameter on the one end portion 14A side than the other end portion 14B side, and an engagement concave portion 14E that engages with the engagement convex portion 20 is formed on the inner periphery of the other end portion 14B. One end portion 12A of the main body member 12 has a tapered shape with a thin tip, and a lock ring 28 for holding the pipe 40 is disposed outside the tip in the axial direction S. The lock ring 28 has an annular shape, has a substantially V-shaped cross section, and has a claw 28A formed on the inner periphery. When the claw portion 28A bites into the outer periphery of the pipe 40, the pipe 40 is prevented from coming off.

  A tapered surface 14 </ b> C with which the substantially V-shaped outer surface of the lock ring 28 can abut is formed on the inner periphery of the sleeve 14. The tapered surface 14C is formed so as to reduce in diameter toward the one end portion 14A side. A small-diameter portion 14D having a minimum inner diameter is formed on the one end portion 14A side of the tapered surface 14C of the sleeve 14.

  A release ring 16 that is movable along the axial direction S of the pipe joint 10 is inserted in the inner periphery of the sleeve 14 on the one end portion 14 </ b> A side of the lock ring 28. The release ring 16 has a substantially cylindrical shape, and an inner peripheral wall forms a part of the flow path R. A protrusion 16 </ b> A is formed in the circumferential direction on the outer periphery of the release ring 16, and is prevented from coming off from the sleeve 14 by contacting the small diameter portion 14 </ b> D of the sleeve 14. The tip portion 16B of the protrusion 16A has a tapered shape that is tapered, and is disposed along the V-shaped outer peripheral surface on the radially inner side of the lock ring 28. The release ring 16 is used to remove the claw portion 28A of the lock ring 28 that has bitten into the pipe 40.

On the inner periphery of the main body member 12, the movable member 30 is disposed on the one end 12 </ b> A side of the restricting convex portion 26. As shown in FIG. 2, the movable member 30 has an annular shape, and includes a facing portion 32 and an insertion portion 34 having an outer diameter smaller than that of the facing portion 32. The outer diameter of the insertion portion 34 is smaller than the outer diameter of the facing portion 32. The inner peripheral surfaces of the insertion portion 34 and the facing portion 32 are flush with each other. The facing portion 32 and the insertion portion 34 are integrally formed, and are arranged so that the insertion portion 34 faces the one end portion 12A side of the main body member 12. The facing portion 32 has an outer peripheral surface along the inner periphery of the main body member 12 on the one end portion 12A side, and a concave strip 32A is formed on the outer peripheral surface. An outer seal member 35A is fitted into the recess 32A. The outer seal member 35 </ b> A seals between the inner peripheral surface of the main body member 12 and the outer peripheral surface of the movable member 30. This seal portion is hereinafter referred to as “outer seal portion S2”. The position of the outer seal portion S2 is equal to the inner peripheral position of the main body member 12 on the one end portion 12A side.
The distance from the central axis S to the outer seal portion S2 is r2, and the distance from the central axis S to the inner periphery of the movable member 30 is r0 (see FIGS. 3A and 3B). Further, the cross-sectional area A2 between the inner periphery of the movable member 30 and the inner periphery on the one end 12A side of the main body member 12 (the difference between the area of the cross section having the radius of the distance r2 and the area of the cross section having the radius of the distance r0) ), And A1 is a cross-sectional area between the inner periphery of the movable member 30 and the inner periphery of the inner seal member 35B. Cross-sectional area A2> cross-sectional area A1.

  An end surface of the facing portion 32 on the insertion portion 34 side (hereinafter referred to as “facing surface 32 </ b> B”) faces the pipe 40 inserted into the main body member 12. A step portion 33 is formed between the facing surface 32 </ b> B and the outer periphery of the insertion portion 34. An inner seal member 35B is disposed on the facing surface 32B. The inner seal member 35B is disposed radially inward of the outer seal member 35A. The inner seal member 35B seals between the front end surface 40A of the pipe 40 and the facing surface 32B of the movable member 30. This seal portion is hereinafter referred to as “inner seal portion S1”. The position of the inner seal portion S1 is equal to the diameter of the seal portion on the radially inner side by the inner seal member 35B. The distance from the central axis S to the inner seal portion S1 is r1. Since the inner seal member 35B is disposed radially inward of the outer seal member 35A, r1 <r2 (see FIGS. 3A and 3B).

  The outer diameter of the insertion portion 34 is a diameter that can be fitted inside the pipe 40. The pipe 40 is inserted between the insertion portion 34 and the main body member 12, and the distal end surface 40A of the pipe 40 is in contact with the inner seal member 35B. The movable member 30 is restricted from moving toward the other end 12 </ b> B by the restricting convex portion 26.

  In the present embodiment, the main body member 12, the sleeve 14, the release ring 16, and the movable member 30 are made of resin, and the lock ring 28 is made of stainless steel. The pipe 40 is made of resin. As the resin, a thermoplastic resin that satisfies heat resistance performance, water resistance performance, and leaching performance, such as PPS (polyphenylene sulfide), PB (polybutene), PPSU (polyphenylsulfone), and PES (polyethersulfone) is preferably used. be able to.

Each member of the pipe joint 10 is not limited to these materials, and other materials may be used. For example, the main body member 12 may be made of metal, and the sleeve 14, the release ring 16, and the movable member 30 may be made of resin and made of stainless steel. Also, the pipe 40 may be made of stainless steel, copper, rubber, or other relatively soft member into which the claw portion 28A of the lock ring 28 can bite.

  Next, the operation of the pipe joint 10 will be described.

  When connecting the pipe 40 to the pipe joint 10, the pipe 40 is inserted from the one end portion 14 </ b> A side of the sleeve 14. The distal end of the pipe 40 expands the diameter of the lock ring 28, and the outer peripheral surface of the pipe 40 advances to the back side while being in sliding contact with the claw portion 28 </ b> A of the lock ring 28, and enters between the insertion portion 34 and the main body member 12. Contact the seal member 35B. In this state, when the liquid is supplied into the flow path R, as shown in FIG. 3B, axial forces P1 and P2 act on the movable member 30, respectively. At this time, the distance r2 from the central axis S of the outer seal portion S2 is longer than the distance r1 from the central axis S of the inner seal portion S1, and the sectional area A2 is larger than the sectional area A1, so that the axial force P1 <axis Force P2. Therefore, the movable member 30 is pushed toward the distal end surface 40 </ b> A of the pipe 40. On the other hand, as shown in FIG. 4, the claw 28 </ b> A of the lock ring 28 bites into the pipe 40, and the movement in the direction of coming out of the main body member 12 is restricted. Thereby, the inner seal member 35B is elastically deformed and crushed between the tip surface 40A of the pipe 40 and the facing surface 32B of the facing portion 32, and the gap between the pipe 40 and the facing surface 32B can be reliably sealed.

  Further, in this embodiment, since the sealing is performed at the tip end surface 40A of the pipe 40, the inner diameter of the flow path R is not reduced as in the case of sealing at the inner peripheral surface of the pipe 40. Can do. Further, as in the case where sealing is performed on the outer peripheral surface of the pipe 40, it is possible to prevent a decrease in water stoppage due to damage to the outer peripheral surface of the pipe 40.

  Further, in this embodiment, if the outer diameter of the pipe 40 is a size corresponding to the inner diameter of the main body member 12 on the one end portion 12A side, the diameter of the insertion portion 34 of the movable member 30 is different even if the inner diameter of the pipe 40 is different. It is possible to easily cope with the change.

  In the present embodiment, the outer peripheral surface of the insertion portion 34 is flat. However, as shown in FIG. 5, the distal end side of the insertion portion 34 may have a sawtooth shape 34 </ b> A as a retaining protrusion. The sawtooth shape 34A has a sawtooth shape in cross section in the axial direction and has a small angle on the tip side with respect to the outer peripheral surface. In this way, by adopting the sawtooth shape 34A, it is possible to prevent the pipe 40 from moving in the direction of exiting the movable member 30 immediately after the liquid is supplied to the flow path R.

  Further, as shown in FIG. 6, a spring 37 as an urging member may be disposed between the restricting convex portion 26 and the movable member 30. In this case, the spring 37 is arranged and the pipe 40 is inserted until the spring 37 is compressed. Then, the movable member 30 is pushed toward the pipe 40 by the restoring force of the spring 37. Thereby, in particular, the pipe 40 immediately after the liquid is supplied to the flow path R can be prevented from moving in the direction of exiting the movable member 30.

  Moreover, in this embodiment, although the insertion part 34 was formed in the movable member 30, the insertion part 34 is not necessarily required. A concave line that fits the inner seal member 35B into the opposing surface 32B may be formed, and the inner seal member 35B may be disposed in the concave line. By forming the insertion portion 34 as in the present embodiment, the circular shape of the tip portion of the pipe 40 can be maintained and collapse can be prevented.

  Further, in the present embodiment, the outer seal member 35A is disposed on the outer periphery of the facing portion 32 of the movable member 30, but the outer seal member 35A is formed on the restricting convex portion 26 as long as it is radially outer than the inner seal member 35B. You may arrange | position to the surface contact | abutted.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The pipe joint 48 of the present embodiment differs from the first embodiment in the shape of the main body member 12, and includes a movable member 60 instead of the movable member 30. Other configurations are the same as those of the first embodiment.

  As shown in FIG. 7, the main body member 12 is formed with a recess 12 </ b> D capable of storing a part of the movable member 60 on the inner periphery on the one end 12 </ b> A side of the nut portion 24.

  A movable member 60 is disposed on the inner periphery of the main body member 12 and on the one end 12 </ b> A side of the restricting convex portion 26. The movable member 60 is annular, and includes a facing portion 62 and an extrapolating portion 64 having an inner diameter larger than that of the facing portion 62. The outer peripheral surfaces of the outer insertion portion 64 and the facing portion 62 are flush with each other. The facing portion 62 and the outer insertion portion 64 are integrally formed, and are arranged so that the outer insertion portion 64 faces the one end portion 12A side of the main body member 12. The movable member 60 has an outer peripheral surface along the inner periphery of the concave portion 12D of the main body member 12, and as shown in FIGS. 8A and 8B, a groove 62A is formed on the outer peripheral surface of the facing portion 62. Has been. An outer seal member 35A is fitted into the recess 62A. The outer seal member 35 </ b> A seals between the inner peripheral surface of the recess 12 </ b> D of the main body member 12 and the outer peripheral surface of the movable member 60. This seal portion is hereinafter referred to as “outer seal portion S4”. The position of the outer seal portion S4 is equal to the inner peripheral position of the recess 12D of the main body member 12. The distance from the central axis S to the outer seal portion S4 is r4. Further, the cross-sectional area A4 between the inner periphery of the movable member 60 and the inner periphery of the recess 12D of the main body member 12 (difference between the cross-sectional area having the radius of the distance r4 and the cross-sectional area having the radius of the distance r0). A cross-sectional area between the inner periphery of the movable member 60 and the inner periphery of the inner seal member 35B is A3. Cross-sectional area A4> cross-sectional area A3.

  An end surface of the facing portion 62 on the outer insertion portion 64 side (hereinafter referred to as “facing surface 62 </ b> B”) faces the pipe 40 inserted into the main body member 12. A step portion 63 is formed between the facing surface 62 </ b> B and the inner periphery of the extrapolation portion 64. An inner seal member 35B is disposed on the facing surface 62B. The inner seal member 35B is disposed radially inward of the outer seal member 35A. The inner seal member 35B seals between the front end surface 40A of the pipe 40 and the opposing surface 62B of the movable member 60. This seal portion is hereinafter referred to as “inner seal portion S3”. The distance from the central axis S to the inner seal portion S3 is r3. Since the inner seal member 35B is disposed radially inward from the outer seal member 35A, r3 <r4.

  The outer diameter of the outer insertion portion 64 is a diameter corresponding to the outer diameter of the pipe 40. The pipe 40 is inserted between the outer insertion portion 64 and the main body member 12, and the front end surface 40A of the pipe 40 is brought into contact with the inner seal member 35B. The movable member 60 is restricted from moving toward the other end 12 </ b> B by the restricting convex portion 26.

  Next, the operation of the pipe joint 48 will be described.

  When the pipe 40 is connected to the pipe joint 48, the pipe 40 is inserted from the one end portion 14A side of the sleeve 14 and brought into contact with the inner seal member 35B. In this state, when the liquid is supplied into the flow path R, as shown in FIG. 8B, internal pressures P3 and P4 act on the inner seal portion S3 and the outer seal portion S4, respectively. At this time, the distance r4 from the central axis S of the outer seal portion S4 is longer than the distance r3 from the central axis S of the inner seal portion S3, and the sectional area A4 is larger than the sectional area A3. Force P4. Therefore, the movable member 60 is pushed toward the distal end surface 40 </ b> A of the pipe 40. On the other hand, as shown in FIG. 9, the claw 28 </ b> A of the lock ring 28 bites into the pipe 40, and movement in the direction of coming out of the main body member 12 is restricted. As a result, as shown in FIG. 8B, the inner seal member 35B is elastically deformed between the tip surface 40A of the pipe 40 and the facing surface 62B of the facing portion 62, and is crushed. The gap can be reliably sealed.

  In the present embodiment, since the outer peripheral side of the outer insertion portion 64 and the facing portion 62 of the movable member 60 is accommodated in the recess 12D, the movable member 60 comes out of the main body member 12 when the pipe 40 is not connected. This can be prevented.

  Also in this embodiment, as shown in FIG. 10, an insertion portion 66 that can be inserted into the pipe 40 may be formed in the movable member 60. In this case, an insertion port 68 into which the pipe 40 can be inserted is formed between the insertion portion 66 and the outer insertion portion 64.

10 pipe joint 12 body member 12A one end (one end)
12 Main body member 26 Restriction convex part 28 Lock ring (regulation member)
30 Movable member 32 Opposing part 32B Opposing surface 33 Stepped part 34A Bamboo shoot shape (prevention convex part)
34 Insertion portion 35A Outer seal member 35B Inner seal member 37 Spring (biasing member)
40 Pipe
40A Tip surface 48 Pipe joint 60 Movable member 62 Opposing part 62B Opposing surface 63 Step part 66 Inserting part

Claims (7)

A main body member that is tubular and has a flow path formed inside the cylinder, and the pipe is inserted inside one end in the cylinder axis direction,
A movable member that is annularly disposed on the inner periphery of the main body member, is formed with a facing portion that faces the distal end surface of the tubular body, and is restricted from moving away from the tubular body;
An inner seal member that is sandwiched between a facing portion of the movable member and a distal end surface of the tubular body, and seals between the tubular body and the movable member;
An outer seal member disposed between the movable member and the main body member and radially outside the inner seal member, and sealing between the movable member and the main body member;
Tube seal structure with   The movable member has an insertion portion fitted to the inner periphery of the tubular body at a distal end portion on the tubular body side, and a stepped portion is formed between the facing portion and the insertion portion. 2. The tube seal structure according to claim 1, wherein   3. The tube according to claim 1, wherein a restriction convex portion that restricts movement of the movable member in a direction away from the tube body is formed on an inner periphery of the main body member. 4. Body seal structure.   The tubular seal structure according to any one of claims 1 to 3, wherein the outer seal member is disposed on an outer peripheral surface of the facing portion.   The tubular seal structure according to claim 4, wherein a retaining protrusion that can bite into an inner periphery of the tubular body is formed on an outer peripheral surface of the insertion portion of the movable member.   The tubular body seal structure according to any one of claims 1 to 5, further comprising an urging member that urges the movable member toward a distal end surface of the tubular body. The tubular body seal structure according to any one of claims 1 to 6,
A regulating member that regulates movement of the tube inserted inside the main body member in a direction of coming out of the main body member;
With pipe fittings.

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