JP2019090503A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint capable of suppressing fluid leakage even in a pipe joint in which a pipe body is inserted in a state where a joint body and a cap member are assembled. SOLUTION: The joint body 3 and the cap member 4 are provided with a lock ring 5 for restricting the withdrawal of an inserted pipe body 2A and 2B and a seal ring for suppressing the leaked fluid from leaking to the outside. In the assembled state, it is provided with contact surfaces that come into contact with each other in the axial direction, and at least a part of the contact surfaces is a contact seal surface that is in contact and sealed. When the gap between the joint body 3 and the cap member 4 is securely sealed by the contact sealing surface, so that fluid leaks from the gap between the innermost end surface 15 of the pipe body 2A and the stepped surface 16 of the joint body 3. However, it is possible to suppress the leakage of the fluid from the gap between the joint body 3 and the cap member 4 to the outside of the pipe joint 1. [Selection diagram] Fig. 1

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a pipe joint, and more particularly to a pipe joint provided with a lock ring that regulates withdrawal of an inserted pipe.

  As a pipe joint of this type, a technology described in Patent Document 1 below has been proposed. This pipe joint comprises a cylindrical joint body having a stepped surface in the inner back portion that abuts the deepest end of the pipe, and a cylindrical cap member assembled by screwing in the opening of the joint body. . In this pipe joint, the pipe body is inserted in a state where the joint body and the cap member are assembled.

  Also, the pipe joint is a seal ring that prevents fluid leaking from the gap between the deepest end of the inserted pipe and the stepped surface from leaking out of the pipe joint, and the inserted pipe And a lock ring that regulates withdrawal of the

  The seal ring is attached to a seal accommodating portion formed on the inner peripheral surface of the joint body. The lock ring is attached to a lock ring accommodating portion formed on the inner peripheral surface of the cap member. The lock ring has a plurality of claws formed around the center hole of the annular plate.

  According to the pipe joint of the above configuration, the claw of the lock ring is pushed by the outer peripheral surface of the pipe body at the time of insertion of the pipe body to elastically expand the diameter, whereby the innermost end of the pipe body is a stepped surface It can be inserted until it abuts on the After insertion of the tube, if a force in the pulling direction acts on the tube, the tip of the claw of the lock ring bites into the outer surface of the tube and regulates that the tube is pulled out.

JP, 2016-223544, A

  In the above-described structure of the pipe joint in which the pipe body is inserted in a state where the joint body and the cap member are assembled, leakage occurs from the gap between the deepest end of the inserted pipe body and the stepped surface Fluid may leak through the gap between the fitting body and the cap member to the outside of the fitting.

  Therefore, an object of the present invention is to provide a pipe joint capable of suppressing fluid leakage even in a pipe joint into which a pipe body is inserted in a state in which a joint body and a cap member are assembled.

  The pipe joint of the present invention is a cylindrical metal joint body having a stepped surface which abuts the deepest end of the pipe at the inner back portion, and a cylindrical body assembled by screwing in the opening of the joint body. And a metal cap member, and in a state where the joint body and the cap member are assembled, an insertion space into which the pipe body is inserted is formed, and is engaged with the outer peripheral surface of the inserted pipe body Lock ring for restricting the withdrawal of the tube, the outer circumferential surface of the inserted tube and the circumferential surface of the insertion space to contact the innermost end of the tube and the stepped surface And a seal ring that prevents fluid leaked from the gap from leaking out of the pipe joint, wherein the joint body and the cap member contact each other in the axial direction in an assembled state. Is provided radially outward of the insertion space, and at least a part of the contact surface It is characterized in that it is a contact seal surface to be sealed in contact.

  In the pipe joint of the present invention having the above-described configuration, when the cap member is assembled by screw fastening to the opening of the joint body, an insertion space into which the pipe body is inserted is formed. When inserting the pipe into the insertion space of the pipe joint, the seal ring is pressed between the outer peripheral surface of the pipe and the peripheral surface of the insertion space and radially compressed. In the lock ring, the claws of the lock body are elastically pushed radially outward by the outer peripheral surface of the pipe body to allow insertion of the pipe body, whereby the deepest end of the pipe body is stepped with the inner back portion of the joint main body The tube is inserted into the insertion space until it abuts the surface.

  As described above, in the use state where the pipe body is inserted into the insertion space of the pipe joint, the fluid flows through the pipe body, and the fluid leaks from the gap between the deepest end opening of the pipe body and the stepped surface of the joint body In this case, the seal ring compressed in contact with the outer peripheral surface of the tubular body and the peripheral surface of the insertion space allows fluid to flow from the space between the peripheral surface of the tubular body and the peripheral surface of the insertion space to the outside of the pipe joint. Leakage can be suppressed.

  Further, in the pipe joint of the present invention, the cap member is assembled by screw fastening to the opening of the joint body such that the abutting surfaces of the joint body and the separate members of the cap member abut in the axial direction. At least a part of is a contact sealing surface. For this reason, since the gap between the contact surfaces of the joint body and the cap member is reliably sealed by the contact seal surface, the fluid leaks from the gap between the deepest end opening of the tube and the stepped surface of the joint body. Even in this case, it is possible to suppress the leakage of fluid to the outside of the pipe joint from the gap between the abutting surfaces of the joint body and the cap member.

  In the pipe joint of the present invention, a female screw is formed on a part of the inner peripheral surface of the opening of the joint body, and a male screw is formed on a part of the outer peripheral surface of the cap member. Thus, the cap member is assembled to the opening of the joint body, and the abutting seal surface is disposed radially inward on the stepped surface side with respect to the screw fastening portion of the female screw and the male screw. Can be adopted.

  In the pipe joint having the above configuration, a clearance between the joint main body and the cap member due to the abutting seal surface disposed radially inward on the stepped surface side with respect to the screw fastening portion of the female screw and the male screw Leakage of fluid from the pipe to the outside of the pipe joint can be suppressed.

  In the pipe joint of the present invention, a female screw is formed on a part of the inner peripheral surface of the opening of the joint body, and a male screw is formed on a part of the outer peripheral surface of the cap member. Thus, the cap member is attached to the opening of the joint body, and the abutting seal surface is on the opposite side of the stepped surface and radially outward with respect to the screw fastening portion of the female screw and the male screw. It is possible to adopt the arranged configuration.

  In the pipe joint of the above configuration, the abutting seal surfaces disposed on the opposite side of the stepped surface and radially outward with respect to the screw fastening portion of the female screw and the male screw allow the joint surfaces of the joint body and the cap member to contact with each other. Leakage of fluid to the outside of the fitting from the gap of

  In the pipe joint of the present invention, a female screw is formed on a part of the inner peripheral surface of the opening of the joint body, and a male screw is formed on a part of the outer peripheral surface of the cap member. Thus, in a state where the cap member is assembled to the opening of the joint main body and the cap member is assembled to the joint main body, the inner peripheral surface of the opening of the joint main body and the outer peripheral surface of the cap member A configuration in which an outer seal ring for sealing a gap is interposed can be employed.

  According to the pipe joint having the above configuration, in the state where the cap member is assembled to the joint body, the gap between the joint surfaces of the joint body and the cap member is sealed by the abutting seal surface and the outer seal ring Is more reliably sealed.

  According to the pipe joint of the present invention, the seal ring can prevent the fluid from leaking between the outer peripheral surface of the pipe body and the peripheral surface of the insertion space to the outside of the pipe joint, and the joint seal surface Leakage of fluid from the gap between the contact surfaces of the cap member to the outside of the pipe joint can be suppressed.

It is a partially broken side view of a pipe joint concerning a first embodiment of the present invention. It is a single-piece figure of the lock ring, (a) is a side view, (b) is a front view. It is a partially broken side view of a pipe joint concerning a second embodiment of the present invention. It is a partially broken side view of the pipe joint concerning a third embodiment of the present invention. It is a partially broken side view of a pipe joint concerning a fourth embodiment of the present invention. It is a partially broken side view of a pipe joint concerning a fifth embodiment of the present invention.

  Hereinafter, a pipe joint according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5. The pipe joint 1 according to the present embodiment is suitably used for joining medical gas copper pipes, which are an example of the pipes 2A and 2B, and copper pipes for refrigerant. In addition, it is known that these medical gas, a refrigerant | coolant (both gas and liquid are included), etc. are generally high pressure with respect to the water pressure of tap water, for example.

  As shown in FIG. 1, the pipe joint 1 according to the first embodiment includes a joint body 3, a cap member 4, a plurality of seal rings, and a plurality of lock rings 5, 5. The pipe joint 1 is a pipe joint portion 6A, 6B having a symmetrical structure at a central position in a direction along the axial center direction (longitudinal direction) of the pipe bodies 2A, 2B in order to join the pipe bodies 2A, 2B to be connected. Are configured as a pair and in an integrated manner. For this reason, in the following description, the description of the configuration on the other side is shared with the description of the configuration of the pipe joint portion 6A on one side with respect to the central position.

  In addition, although the pipe joint part 6A on one side and the pipe joint part 6A on the other side have the joint main body 3 which is symmetrical in the left and right configuration and integrated, in the following description, it is the joint main body 3 in the left and right symmetrical configuration. Even in the case of the joint main body 3 in the description of the configuration of the pipe joint portion 6A on one side, the joint main body 3 in the region occupied by the pipe joint portion 6A on one side is represented.

  Hereinafter, the configuration of the pipe joint portion 6A on one side will be described. The pipe joint portion 6A includes a joint body 3, a plurality of lock rings 5, a cap member 4, and a plurality of types of seal rings. The joint main body 3 is made of metal and is formed in a tubular shape having a main body side insertion space 7 inside. The fitting main body 3 is a main body large diameter portion 8 which is an end side (for convenience, hereinafter referred to as "primary side") at which insertion of the pipe body 2A is started, and a back side where insertion of the pipe body 2A ends (for convenience And the main body small diameter portion 9 which is referred to as “side”. The main body large diameter portion 8 is formed larger in diameter than the main body small diameter portion 9.

  The inside of the main body large diameter portion 8 (primary side end portion) of the joint main body 3 is an opening 10. An internal thread is formed in a region along the axial direction near the secondary side, which is a part of the inner peripheral surface of the large diameter portion 8 of the main body. An annular main-side large-diameter seal accommodating recess 12 is formed on the inner peripheral surface of the primary side end of the main-unit large-diameter portion 8 to accommodate the large-diameter seal ring 11 as the outer seal ring at the outer diameter side. There is. The primary side end face of the main body large diameter portion 8 is a main body side first contact surface 14 that contacts the cap side first contact surface 13 of the cap member 4.

  The opening 10 is a cylindrical large diameter space into which the secondary side area of the cap member 4 is inserted. A body side insertion space 7 is formed in communication with the secondary side of the opening 10. The inner back portion of the main body side insertion space 7 of the joint main body 3 is reduced in diameter to form an annular stepped surface 16 which abuts on the deepest end surface 15 of the inserted tubular body 2A. The stepped surface 16 is a side surface on one side of the stepped wall 17 formed to be reduced in diameter at a central position in a direction along the axial center direction of the joint main body 3 of the pipe joint 1 and orthogonal to the axial center direction. Placed in the plane to be

  The joint body 3 has a lock ring accommodating portion 18. The lock ring accommodating portion 18 is disposed between the main body large diameter portion 8 and the main body small diameter portion 9. The lock ring accommodating portion 18 is formed at an end position on the opening 10 side in the main body side insertion space 7. The lock ring accommodating portion 18 is formed larger in diameter than the main body side insertion space 7 and smaller in diameter than the opening 10. The diameter of the lock ring accommodating portion 18 is set to be slightly larger than the outer diameter of the lock ring 5 so that the lock ring 5 can be accommodated in the lock ring accommodating portion 18. The length along the axial center direction of the lock ring accommodating portion 18 is set so as to be able to accommodate a plurality of (in this case, two) lock rings 5.

  The end face on the stepped surface 16 side of the lock ring housing portion 18 is a locking surface 19 that prevents the lock ring 5 from moving to the secondary side. The locking surface 19 is disposed on the primary side with respect to the stepped surface 16 and has an annular shape. The locking surface 19 is disposed in a plane orthogonal to the axial direction.

  Here, the configuration of the lock ring 5 will be described. Since the plurality of lock rings 5 have the same configuration, the description of the configuration of one lock ring 5 is also used for the description of the other lock ring 5.

  The lock ring 5 is made of metal. As shown in FIGS. 1 and 2 (a) and 2 (b), the lock ring 5 has an annular flange 20 along the axial direction and an annular shape formed by bending from the end of the flange 20 to the center side. A nail holding portion 21 and a plurality of nails 22 formed by bending the inner circumferential surface of the nail holding portion 21 are provided.

  In particular, the respective claws 22 are arranged on the inner peripheral surface of the claw holding portion 21 at equal intervals in the circumferential direction, and are bent so as to be inclined toward the insertion direction (secondary side) of the tube 2A. ing. The outer diameter line of the claw 22 is formed in an arc shape. The claws 22 are formed such that a virtual circle C (two-dot chain line in the drawing) connecting the tips of the claws 22 is slightly smaller in diameter than the outer diameter of the tubular body 2A. The lock rings 5 are arranged side by side so as to contact the lock ring accommodating portion 18 in the axial direction.

  The lock ring accommodating portion 18 (main body side insertion space 7) and the opening portion 10 are formed as an annular main body side second contact surface 23 which is orthogonal to the axial direction and parallel to the stepped surface 16 and the locking surface 19 ing. The body-side second contact surface 23 is a surface on one side that contacts the cap-side second contact surface 24 of the cap member 4 and forms a metal touch seal surface that is an example of the contact seal surface. For this reason, the main body side second contact surface 23 is processed into a smooth surface. The main body side second contact surface 23 is disposed radially inward on the stepped surface 16 side with respect to the female screw.

  Next, the configuration of the cap member 4 will be described. The cap member 4 is assembled to the opening 10 of the joint body 3 by screw fastening. The cap member 4 is made of metal. The cap member 4 is formed in a cylindrical shape with the inside as a cap-side insertion space 25. The cap side insertion space 25 communicates with the main body side insertion space 7 in a state where the cap member 4 is assembled to the joint main body 3. The cap member 4 includes a reducing portion 28 having an auxiliary seal accommodating portion 27 for mounting the auxiliary seal ring 26, a cap large diameter portion 29 integrally formed on the secondary side of the reducing portion 28, and a cap large diameter portion 29. And a cap small diameter portion 30 integrally formed on the secondary side of the housing.

  The outer peripheral surface of the reduction portion 28 is formed in a conical shape by being reduced toward the primary side. An auxiliary seal accommodating portion 27 to which the auxiliary seal ring 26 is attached is formed on the inner peripheral surface of the reduction portion 28. The auxiliary seal ring 26 contacts the outer peripheral surface of the tubular body 2A, and assists the condensation generated on the outer peripheral surface of the tubular body 2A outside the tubular joint 1 not to enter the interior of the tubular joint 1 in the tubular body 2A.

  The cap large diameter portion 29 is a portion gripped by a tool, and the cap member 4 is screwed to the joint body 3 by gripping and rotating the cap large diameter portion 29 with a tool.

  The cap small diameter portion 30 is smaller in diameter than the cap large diameter portion 29. The cap large diameter portion 29 and the cap small diameter portion 30 are integrally formed via the cap side first contact surface 13. The cap-side first contact surface 13 is formed in an annular shape in a plane perpendicular to the axial direction. An annular cap-side large-diameter seal accommodating recess 31 for accommodating the large-diameter seal ring 11 at the inner diameter side portion toward the primary side end of the outer peripheral surface of the cap small-diameter portion 30, that is, near the cap-side first contact surface 13. Is formed. On the secondary side of the outer peripheral surface of the cap small diameter portion 30 with respect to the cap-side large diameter seal accommodating concave portion 31, an external thread to be screwed to the internal thread is formed.

  The small diameter portion secondary side end surface 32 which is the end surface on the secondary side of the cap small diameter portion 30 is a surface formed annularly. The small diameter portion secondary side end face 32 is set to have a longer length in the radial direction than the main body side second contact surface 23. The small diameter portion secondary side end surface 32 is in contact with the cap side second contact surface 24 that abuts the main body side second contact surface 23 in the axial direction and the primary side surface of the claw holding portion 21 of the lock ring 5 on the primary side. And a pressing surface 33 capable of contacting. An annular recess (reference numeral omitted) is formed between the cap-side second contact surface 24 and the pressing surface 33.

  The cap side second contact surface 24 is the surface on the other side that constitutes the metal touch seal surface. For this reason, the cap side second contact surface 24 is processed into a smooth surface. The cap-side second contact surface 24 is disposed radially inward on the stepped surface 16 side with respect to the male screw. The radially outer portion and the radially inner portion of the cap-side second contact surface 24 are chamfered.

  In the inner peripheral surface of the cap member 4, the accommodation recesses 34 of the small diameter seal rings 35, 35 are disposed apart in the axial direction, and the small diameter seal ring 35 is attached to each of the accommodation recesses 34, 34. The housing recess 34 (small-diameter seal ring 35) disposed on the secondary side and the small-diameter portion secondary side end surface 32 are spaced apart in the axial direction.

  In the pipe joint 1 in the present embodiment, the pipe joint portions 6A having the above-described configuration are configured as a pair and integral structure as left-right symmetric. In the pipe joint 1, the lock rings 5, 5 are attached to the lock ring accommodating portion 18 of the joint body 3 in the axial direction. In the cap member 4, the small diameter seal rings 35, 35 are mounted in the housing concave portions 34, 34, the auxiliary seal ring 26 is mounted in the auxiliary seal housing portion 27, and the large diameter seal ring 31 is mounted in the cap side large diameter seal housing concave portion 31. 11 is mounted at its inner diameter side. With the respective members attached to the joint body 3 and the cap member 4 as described above, the cap small diameter portion 30 of the cap member 4 is inserted into the opening 10 of the joint body 3 and assembled by screwing male and female screws. Thereby, the joint main body 3 and the cap member 4 are integrated, the main body side insertion space 7 and the cap side insertion space 25 communicate, and the insertion space of the tube 2A is formed.

  When assembling the cap member 4 into the opening 10 of the joint main body 3 by screwing the male screw and the female screw, the cap large diameter portion 29 is gripped with a tool, and the cap member 4 is rotated. Tighten the cap member 4 to. Then, the outer diameter side portion of the large diameter seal ring 11 is accommodated in the main body large diameter seal accommodating recess 12.

  Further, the large diameter seal ring 11 is held between the outer peripheral surface of the cap-side large diameter seal accommodating recess 31 and the inner peripheral surface of the main body large diameter seal accommodating recess 12 so as to be compressed. Thus, the gap between the inner peripheral surface of the large diameter portion 8 and the outer peripheral surface of the small diameter cap portion 30 is sealed outward in the axial direction with respect to the screw fastening portion 36 which is a screwing portion of the male screw and the female screw. The axial direction outward is the primary side (the side to which the fluid flowing through the tube 2A flows in) in the pipe joint part 6A on one side, and in the pipe joint part 6A on the other side, the pipe joint part on one side Because of the symmetrical structure with 6A, it is the secondary side (the side from which the fluid flowing through the tube 2A flows out).

  The following description of the operation will be made in the one side pipe joint portion 6A. As described above, the joint body 3 and the cap member 4 are assembled to form the pipe joint 1, and from the cap-side insertion space 25 of the pipe joint 1 to the body-side insertion space 7 (from the primary side to the secondary side) Insert When the tubular body 2A is inserted into the cap-side insertion space 25, the auxiliary seal ring 26 is elastically compressed between the outer peripheral surface of the tubular body 2A and the outer peripheral surface of the auxiliary seal accommodating portion 27. When the tubular body 2A is further inserted, the small diameter seal rings 35, 35 are compressed between the outer circumferential surface of the tubular body 2A and the outer circumferential surfaces of the accommodation recesses 34, 34.

  Since the accommodation recess 34 and the small diameter portion secondary side end face 32 arranged on the secondary side are spaced apart in the axial direction, when the pipe 2A is further inserted, the tip side portion of the pipe 2A Is guided by the inner peripheral surface between the accommodation recess 34 and the small diameter portion secondary side end surface 32 in the cap small diameter portion 30 and reaches the lock rings 5 and 5.

  In lock rings 5 and 5, since claw 22 is elastically pushed radially outward by the outer peripheral surface of tube 2A and insertion of tube 2A is permitted, the deepest end surface 15 of tube 2A is stepped The tube 2A can be inserted into the insertion space (main body side insertion space 7) until it abuts on the surface 16. After the tube 2A is inserted, when a force in the pulling direction acts on the tube 2A, the tip end of the claw 22 bites into the outer surface of the tube 2A to prevent the tube 2A from being pulled out. The movement of the lock rings 5 and 5 to the primary side is blocked by the pressing surface 33 coming into contact with the primary side surface of the claw holding portion 21.

  In the pipe joint 1 of the present embodiment, with the joint body 3 and the cap member 4 assembled, the drawing can be restricted by an operation of inserting the pipe body 2A by a predetermined length. Such a pipe joint 1 is also referred to as a one-touch joint. The pipe body 2A is inserted into the other side of the pipe joint portion 6A as in the case of the one side pipe joint portion 6A.

  In the pipe joint 1 in the present embodiment, when inserting the pipe 2A into the insertion space, the auxiliary seal ring 26 and the small diameter seal rings 35, 35 are between the outer peripheral surface of the pipe 2A and the peripheral surface of the insertion space. It is pressed and compressed radially.

  In a use state where the pipe 2A is inserted into the insertion space of the pipe joint 1, a fluid is supplied into the pipe 2A and flows, and a gap between the deepest end face 15 of the pipe 2A and the stepped surface 16 of the joint body 3 When the fluid leaks from the outer peripheral surface of the tube 2A and the peripheral surface of the insertion space, the auxiliary seal ring 26 and the small diameter seal rings 35 and 35 are compressed to contact the outer peripheral surface of the tube 2A and the insertion space Leakage of fluid from the circumferential surface to the outside of the fitting 1 can be suppressed.

  In the pipe joint 1 according to the present embodiment, the small diameter seal rings 35, 35 are disposed on the primary side of the lock rings 5, 5. That is, when the pipe body 2A is completely inserted into the pipe joint 1, the portion of the outer peripheral surface of the pipe body 2A where the small diameter seal rings 35 and 35 contact each other is a flaw due to contact with the claws 22 of the lock rings 5 and 5. There is no For this reason, the gap between the inside of the cap member 4 and the outer peripheral surface of the tube 2A is reliably sealed by the small diameter seal rings 35, 35.

  By the way, the pipe joint 1 in this embodiment can assemble | attach another members called the joint main body 3 and the cap member 4 in an axial center direction. At this time, the cap-side first contact surface 13 and the body-side first contact surface 14 abut in the axial direction. Further, the cap side second abutting surface 24 and the main body side second abutting surface 23 abut in the axial direction. The cap-side second contact surface 24 and the body-side second contact surface 23 constitute a metal touch seal surface which is a contact seal surface.

  Therefore, the gap between the joint body 3 and the cap member 4 is reliably sealed by the metal touch seal surface at the radially inward position with respect to the screw fastening portion 36 and at the radially outward position of the insertion space. Therefore, even when the fluid leaks from the gap between the deepest end face 15 of the tube 2A and the stepped surface 16 of the joint main body 3, the fluid from the gap between the joint main body 3 and the cap member 4 to the outside of the pipe joint 1 Leakage can be suppressed. In the case where the fluid leaks from the metal touch seal surface, the large diameter seal ring 11 suppresses the leak.

  The pipe joint 1 of the present invention is not limited to the above embodiment. FIG. 3 shows a pipe fitting 1 according to a second embodiment of the present invention. The structure in which the pipe joint 1 according to the second embodiment is different from the pipe joint 1 of the first embodiment is a metal touch seal surface. In the pipe joint 1 according to the first embodiment, the case where the metal touch seal surface is configured by the cap-side second contact surface 24 and the body-side second contact surface 23 is exemplified.

  The metal touch seal surface in the second embodiment is constituted by the cap-side first contact surface 13 and the body-side first contact surface 14. The cap-side first abutment surface 13 and the body-side first abutment surface 14 are formed as smooth surfaces, and the radially outer portion and the radially inward portion of the body-side first abutment surface 14 are chamfered. ing. The metal touch seal surface in the second embodiment is constituted by the cap-side first contact surface 13 and the body-side first contact surface 14, so that the metal touch seal surface is inserted radially outward with respect to the screw fastening portion 36 It is arrange | positioned in the radial direction outward position of space.

  The large diameter seal ring 11 is disposed at the same position as that of the first embodiment. The large diameter seal ring 11 is held between and compressed by the outer peripheral surface of the cap-side large diameter seal accommodating recess 31 and the inner peripheral surface of the main body large diameter seal accommodating recess 12. Thus, the gap between the inner peripheral surface of the large diameter portion 8 and the outer peripheral surface of the small diameter cap portion 30 is sealed outward in the axial direction with respect to the screw fastening portion 36 which is a screwing portion of the male screw and the female screw.

  In the pipe joint 1 according to the second embodiment, the fluid leaking from the gap between the deepest end face 15 of the pipe body 2A and the stepped surface 16 of the joint body 3 is prevented from leaking to the outside by the large diameter seal ring 11. Even if the fluid moves from the large-diameter seal ring 11 to the outside, the joint body 3 is formed by the metal touch seal surface constituted by the cap-side first abutment surface 13 and the body-side first abutment surface 14. And the leak of the fluid to the exterior of the fitting 1 from the clearance gap of the cap member 4 can be suppressed. The other functions and effects are the same as those of the first embodiment, and therefore will not be repeated.

  FIG. 4 shows a pipe joint 1 according to a third embodiment. In the pipe joint 1 according to the third embodiment, the metal touch seal surface is a tapered surface whose diameter is reduced toward the secondary side. The outer periphery of the secondary side end of the cap small diameter portion 30 of the cap member 4 is a cap conical surface 40 whose diameter is reduced toward the secondary side, and the boundary between the main body small diameter portion 9 of the joint main body 3 and the lock ring accommodating portion 18 The surface is a main body conical surface 41 whose diameter is reduced toward the secondary side. The cap conical surface 40 and the main conical surface 41 are formed as smooth surfaces.

  In this case, the metal touch seal surface is disposed at a radially inward position with respect to the screw fastening portion 36 and at a radially outward position of the insertion space, and the joint body 3 and the cap member 4 are formed by the metal touch seal surface. The gap between the two is reliably sealed.

  FIG. 5 shows a pipe joint 1 according to a fourth embodiment. In the pipe joint 1 according to the first embodiment, the main body side second contact surface 23 is an annular flat surface which is orthogonal to the axial direction and is parallel to the stepped surface 16 and the locking surface 19. The contact surface 24 has a cross-sectional shape in which the radially outer portion and the radially inner portion of the smooth surface are chamfered. On the other hand, in the pipe joint 1 in the fourth embodiment, the main body side second contact surface 23 has a cross-sectional shape in which the radially outer portion and the radially inner portion of the smooth surface are chamfered. There is. Further, the radially outer portion of the pressing surface 33 is orthogonal to the axial direction, and is formed as a ring-shaped smooth surface parallel to the stepped surface 16 and the locking surface 19 to be a cap-side second contact surface 24 There is. The main body side second contact surface 23 and the cap side second contact surface 24 are metal touch seal surfaces.

  In this case, the metal touch seal surface is disposed at a radially inward position with respect to the screw fastening portion 36 and at a radially outward position of the insertion space, and the joint body 3 and the cap member 4 are formed by the metal touch seal surface. The gap between the two is reliably sealed.

  FIG. 6 shows a pipe joint 1 according to a fifth embodiment. In the pipe joint 1 according to the fifth embodiment, the main body side second seal surface is used as a metal touch seal surface, with the main body conical surface 41 of the pipe joint 1 according to the third embodiment as a smooth surface. In this case, the inclination of the main body conical surface 41 is set to a predetermined inclination angle (for example, an inclination of 45 ° with respect to the axial direction) with respect to the axial direction. Further, the entire small diameter portion secondary side end surface 32 of the cap member 4 is an annular smooth surface which is orthogonal to the axial direction and parallel to the stepped surface 16 and the locking surface 19. The corner 40a of the continuous portion of the small diameter portion secondary side end surface 32 of the cap small diameter portion 30 and the outer peripheral surface of the cap small diameter portion 30 is used as a metal touch seal surface.

  The pipe joint 1 according to the first to fourth embodiments is an example in which the metal touch seal surface is formed in advance as a flat surface. On the other hand, in the pipe joint 1 according to the fifth embodiment, the corner 40a of the small diameter cap portion 30 is brought into pressure contact with the main body conical surface 41 which is a flat by tightening the cap member 4 on the joint body 3. By bringing the main body conical surface 41 and the corner portion 40a into planar contact, a metal touch seal surface is formed.

  In this case, the metal touch seal surface is disposed at a radially inward position with respect to the screw fastening portion 36 and at a radially outward position of the insertion space, and the joint body 3 and the cap member 4 are formed by the metal touch seal surface. The gap between the two is reliably sealed.

  As another embodiment, for example, the large diameter seal ring 11 can be omitted in all the embodiments. In this case, the main body side large diameter seal accommodation concave portion 12 is not formed in the joint main body 3, and the cap side large diameter seal accommodation concave portion 31 is not formed in the cap member 4.

  In this configuration, for example, in the pipe joint 1 of the first embodiment, the cap-side second contact surface 24 and the main-body-side second contact surface 23 abut on in the axial direction to form a metal touch seal surface, Even when fluid leaks from the gap between the deepest end face 15 of the tube 2A and the stepped surface 16 of the fitting body 3, fluid leakage to the outside of the fitting 1 from the gap between the fitting body 3 and the cap member 4 Can be suppressed.

  In the second embodiment, the case in which the cap-side first contact surface and the main-body-side first contact surface are metal touch seal surfaces that abut in the axial direction is exemplified. In the third embodiment, the fourth embodiment, and the fifth embodiment, it is assumed that the cap-side second contact surface and the body-side second contact surface are metal touch seal surfaces that abut in the axial direction. Illustrated. However, for example, as shown in the second embodiment, in the pipe joint 1 of the first embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the cap side first abutment The pipe joint 1 can also be configured to have a metal touch seal surface in which the surface and the main body side first contact surface contact in the axial direction.

  In each said embodiment, the case where the pipe joint 1 integrally equipped with a pair of pipe joint part 6A was illustrated. However, at least one of the pipe joint parts may be the pipe joint part 6A of the present invention, and the other pipe joint part may not be the pipe joint part 6A of the present invention.

  In each said embodiment, the metal touch seal | sticker surface which is a contact | abutting surface of members made of a metal material was mentioned as an example of a contact | abutting seal | sticker surface. However, as long as the gap between the joint main body 3 and the cap member 4 is reliably sealed by the contact seal surface, it is not specified as the contact surface between members made of metal material, but the contact between resin materials, resin It can also be a contact structure of material and metal material.

  The auxiliary seal ring 26 is not always necessary, and is not necessary when connecting the tubular bodies 2A and 2B in which condensation does not occur. In this case, the auxiliary seal accommodating portion 27 is unnecessary. Moreover, the pipe bodies 2A and 2B joined by the pipe joint 1 are not limited to metal, but may be a composite pipe body of metal and resin.

DESCRIPTION OF SYMBOLS 1 ... Pipe joint, 2A, 2B ... Pipe body, 3 ... Joint main body, 4 ... Cap member, 5, 5 ... Lock ring, 6A ... Pipe joint part, 7 ... Body side insertion space, 10 ... Opening part, 13 ... Cap Side first contact surface, 14: main body side first contact surface, 15: innermost end surface, 16: stepped surface, 18: lock ring accommodating portion, 19: locking surface, 23: main body side second contact Surface 24 24 Cap side second contact surface 25 Cap side insertion space 32 Small diameter part secondary side end face 33 Holding surface 35, 35 Small diameter seal ring 36 Fastening part

Claims (4)

A tubular metal joint body having a stepped surface in contact with the deepest end of the tubular body at the inner back, and a cylindrical metal cap member assembled by screwing to the opening of the joint body Equipped with
A pipe joint in which an insertion space into which the pipe body is inserted is formed in a state where the joint body and the cap member are assembled,
A lock ring which locks on the outer peripheral surface of the inserted tubular body to restrict withdrawal of the tubular body, contacts the outer peripheral surface of the inserted tubular body and the peripheral surface of the insertion space, The seal ring further includes a fluid that leaks from a gap between the deepest end of the tubular body and the stepped surface to prevent the fluid from leaking to the outside of the pipe joint,
The joint body and the cap member are provided with contact surfaces that contact each other in the axial direction in the assembled state, radially outward of the insertion space,
A pipe joint characterized in that at least a part of the contact surface is in contact and sealed. An internal thread is formed on a part of the inner peripheral surface of the opening of the joint body, an external thread is formed on a part of the outer peripheral surface of the cap member, and the opening of the joint body is formed by screwing the internal thread and the external thread. A pipe joint on which the cap member is assembled,
The pipe joint according to claim 1, wherein the abutting seal surface is disposed radially inward on the stepped surface side with respect to a screw fastening portion of the female screw and the male screw. An internal thread is formed on a part of the inner peripheral surface of the opening of the joint body, an external thread is formed on a part of the outer peripheral surface of the cap member, and the opening of the joint body is formed by screwing the internal thread and the external thread. A pipe joint on which the cap member is assembled,
The pipe joint according to claim 1, wherein the abutting sealing surface is disposed on the opposite side of the stepped surface and radially outward with respect to a screw fastening portion of the female screw and the male screw. An internal thread is formed on a part of the inner peripheral surface of the opening of the joint body, an external thread is formed on a part of the outer peripheral surface of the cap member, and the opening of the joint body is formed by screwing the internal thread and the external thread. A pipe joint on which the cap member is assembled,
The outer seal ring for sealing the gap between the inner peripheral surface of the opening of the joint body and the outer peripheral surface of the cap member is interposed in a state where the cap member is assembled to the joint body. The pipe joint according to any one of claims 3.

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