JP2008175226A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint allowing easy insertion of a pipe body into a joint body. <P>SOLUTION: When inserted into the pipe body 30, a cylindrical member 40 has contact with the inner peripheral face of the pipe body 30 to hold the shape of the pipe body 30. The joint body 20 has a lock ring 18, and a sleeve member 17 mounted on the joint body 20 abuts on the outer periphery of the lock ring 18 to hold the lock ring 18. The lock ring 18 has a pawl portion extending to the inner periphery side. When the pipe body 30 is inserted through an insertion hole 26 into the joint body 20, the pawl portion is bitten into the outer peripheral face of the pipe body 30 to prevent the come-off of the pipe body 30 from the insertion hole 26. Since the cylindrical member 40 holds the shape of the pipe body 30, the pipe body 30 such as a rubber hose having low rigidity is free from bending on the midway, and the pipe body 30 can be easily inserted into the joint body 20 until the pawl portion is bitten into the outer surface of the pipe body 30. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pipe joint for coupling and releasing a pipe body.

  There has been proposed a pipe joint capable of coupling and detaching a pipe body by one-touch operation.

A cylindrical lock ring having a claw portion formed on the inner peripheral side is arranged inside such a pipe joint, and the claw portion of the lock ring is placed on the outer peripheral surface of the tubular body inserted from the insertion hole. By biting in, the tube body is prevented from being pulled out from the insertion hole (see Patent Document 1).
JP-A-11-118081

  However, this pipe joint has no problem in joining pipes such as high-rigidity nylon pipes and single-layer resin pipes. There was a problem in connecting pipe bodies such as () thin hose).

  Specifically, in order to maintain the shape of the pipe body, the pipe joint is provided with a core metal fitting that contacts the inner peripheral surface of the inserted pipe body. While sliding the inner peripheral surface to the outer surface of the core metal fitting, the tube body had to be inserted until the claw portion of the lock ring bites into the outer surface of the tube body.

  When the tube body is a rubber hose with low rigidity, the inner and outer peripheral surfaces of the tube body are difficult to slip and stick, and the claw part of the lock ring is attached to the tube body while sliding the outer surface of the core metal fitting. The operation of inserting the tube until it bites into the outer surface of the rubber hose is not easy because the rubber hose may be bent in the middle.

  Furthermore, when the tube body is a rubber hose, the outer surface of the tube body is often formed by cloth winding molding, the mesh of the cloth is transferred to the outer surface, and the outer surface is a non-smooth surface. In such a case, in particular, the claw portion is caught on the outer surface of the tubular body, which deteriorates workability.

  In view of the above facts, it is an object of the present invention to provide a pipe joint in which a pipe body can be easily inserted into a joint body.

  A pipe joint according to a first aspect of the present invention includes a cylindrical member that is inserted into a pipe body and maintains the shape of the pipe body in contact with an inner peripheral surface of the pipe body, and an insertion hole into which the pipe body is inserted. A joint body formed, and a claw part provided inside the joint body and extending to the inner peripheral side, and having the claw part bite into the outer peripheral surface of the tubular body inserted from the insertion hole. A lock ring that prevents the tube body from being pulled out; and a sleeve member that is attached to the joint main body and that contacts the outer periphery of the lock ring and holds the lock ring.

  According to the above configuration, by inserting the cylindrical member into the tubular body, the cylindrical member is in contact with the inner peripheral surface of the tubular body and maintains the shape of the tubular body.

  The joint body is formed with an insertion hole into which the tubular body into which the cylindrical member is inserted, and a lock ring is provided inside the joint body. Further, the sleeve member attached to the joint main body is in contact with the outer peripheral portion of the lock ring to hold the lock ring.

  Further, the lock ring is provided with a claw portion extending to the inner peripheral side, and when the tube body is inserted into the joint body from the insertion hole in a state where the shape of the tube body is held by the cylindrical member, The claw portion bites into the outer peripheral surface of the tubular body and prevents the tubular body from being pulled out from the insertion hole.

  By maintaining the shape of the tubular body in this way, even if the tubular body is a rubber hose or the like having low rigidity, the tubular body will not be bent in the middle, and the tubular body until the claw bites into the outer surface of the tubular body. Can be easily inserted into the joint body.

  A pipe joint according to a second aspect of the present invention is characterized in that, in the first aspect, the end of the cylindrical member is provided with a flange that contacts the end face of the tubular body.

  According to the said structure, the collar part contact | abutted with the end surface of a tubular body is provided in the edge part of the cylindrical member. For this reason, it is possible to protect the end face of the tube body, and furthermore, when the tube body is inserted into the joint body, the claw portion of the lock ring is caught on the end surface of the tube body and the end face of the tube body is prevented from turning up. can do.

  Further, when the cylindrical member is inserted into the tubular body, the collar portion comes into contact with the end surface of the tubular body and stops, so that the insertion position of the cylindrical body can be stabilized.

  A pipe joint according to a third aspect of the present invention is the pipe joint according to the first or second aspect, wherein a cylindrical body that contacts an inner peripheral surface of the cylindrical member inserted into the joint main body and determines a position of the cylindrical member is the joint. It is provided in a main body.

  According to the said structure, the cylinder provided in the coupling main body contact | abuts with the internal peripheral surface of a cylindrical member, and determines the position of a cylindrical member. By determining the position of the cylindrical member in this way, the claw portion of the lock ring can be evenly bited into the outer peripheral portion of the tubular body.

  A pipe joint according to a fourth aspect of the present invention is the pipe joint according to the first or second aspect, wherein the cylindrical member is provided with a cylindrical body toward the joint main body, and the joint main body includes the cylindrical body. A cylindrical hole is provided in contact with the outer peripheral surface to determine the position of the cylindrical member.

  According to the said structure, the cylindrical hole provided in the coupling main body contact | abuts with the outer peripheral surface of the cylindrical body provided in the cylindrical member, and determines the position of a cylindrical member. By determining the position of the cylindrical member in this way, the claw portion of the lock ring can be evenly bited into the outer peripheral portion of the tubular body.

  According to the pipe joint of the present invention, the pipe body can be easily inserted into the joint body.

  A pipe joint 10 according to an embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 6, the joint main body 20 of the pipe joint 10 includes a tubular main body portion 12 and a tubular intermediate portion 14 that is extrapolated to the main body portion 12.

  A ring-shaped collet 16 made of synthetic resin is inserted on the insertion side of the tube body 30 in the joint body 20 so as to be movable in the axial direction of the tube body 30, and is a sleeve member fitted into the inner surface of the intermediate portion 14. 17 prevents the joint body 20 from coming off.

  Specifically, as shown in FIG. 1B, the sleeve member 17 includes a conical conical surface 17A that is narrow on the insertion side of the tube body 30 and wide on the back side. The rear surface facing the surface is in contact with the conical surface 17A so as not to come out of the joint body 20.

  As shown in FIGS. 5A, 5B, and 5C, the collet 16 is formed with a plurality of slits 16A in the axial direction from the front surface and the back surface, so that the collet 16 can expand and contract in the radial direction. It has become. Further, a convex convex portion 16 </ b> B that goes around the inner peripheral surface is provided at the center of the inner peripheral surface of the collet 16.

  Further, the collet 16 has a symmetrical shape when viewed from the side, and the front and back surfaces of the collet 16 have the same shape. For this reason, even if the collet 16 is assembled with the arrangement direction of the collet 16 reversed in the joint assembling process, no trouble occurs.

  Further, as shown in FIG. 1B, a stainless steel lock ring 18 is inserted into the sleeve member 17 on the back side (the main body 12 side) of the collet 16.

  As shown in FIGS. 4A and 4B, the lock ring 18 has a V-shaped cross section, and is arranged so that the V-shaped opening 18A faces the back side, and the collet 16 (FIG. 1B The outer surface of the tip of (see) is in contact with the V-shaped lower surface of the lock ring 18.

  Further, the lock ring 18 is cut in the radial direction, and a plurality of (eight in the present embodiment) claw portions 19 are provided on the inner peripheral side. Further, the lock ring 18 is formed with an outer peripheral inclined surface 18B that comes into contact with the conical surface 17A of the sleeve member 17 (see FIG. 1B). Further, the lock ring 18 is made of stainless steel, and each claw portion 19 cut and cut is elastically deformed so that it can expand and contract in the radial direction.

  Further, as shown in FIG. 1B, a convex convex portion 14A projects from the intermediate portion 14 to the opening 18A of the lock ring 18, and the convex portion 14A, the intermediate portion 14, and the collet 16 are projected. The inside is a tube insertion hole 26 into which the tube 30 is inserted. Furthermore, the main body portion 12 of the present embodiment is made of brass, the intermediate portion 14 is made of synthetic resin, and the wall surface 14 </ b> C whose diameter is reduced at the innermost portion serves as a stopper of the tubular body 30. Further, a screw portion 22 is formed outside the main body portion 12.

  On the other hand, as shown in FIG. 1A, a cylindrical cylindrical member 40 that is inserted into the tube body 30 is provided before the tube body 30 is inserted into the tube body insertion hole 26 of the joint body 20. At the end portion of the cylindrical member 40, a flange portion 42 that comes into contact with the end surface 30A of the tubular body 30 when the cylindrical member 40 is inserted into the tubular body 30 extends in the radial direction and is provided in a plate shape.

  Furthermore, a concave portion 40A is provided on the outer peripheral surface of the cylindrical member 40 so as to surround the cylindrical member 40, and a rubber O-ring 24 having a circular cross section is fitted into the concave portion 40A. With this configuration, the O-ring 24 seals the inner peripheral surface of the tubular body 30 and the outer peripheral surface of the cylindrical member 40 in a state where the cylindrical member 40 is inserted into the tubular body 30.

  Further, as shown in FIG. 1B, the main body 12 has a cylindrical shape that abuts the inner peripheral surface of the cylindrical member 40 inserted into the joint main body 20 and determines the radial position of the cylindrical member 40. The cylindrical body 44 is integrally formed, and the radial position of the tubular body 30 inserted into the joint body 20 can be determined.

  Furthermore, a concave portion 44A is provided on the outer peripheral surface of the cylindrical body 44 so as to surround the cylindrical cylindrical body 44, and a rubber O-ring 46 having a circular cross section is fitted into the concave portion 44A. With this configuration, the O-ring 46 seals the inner peripheral surface of the cylindrical member 40 inserted into the joint body 20 and the outer peripheral surface of the cylindrical body 44.

  Next, a procedure for inserting the pipe body 30 into the joint body 20 will be described.

  As shown in FIG. 1A, first, the cylindrical member 40 is inserted into the tubular body 30, and the flange portion 42 of the cylindrical member 40 and the end surface 30A of the tubular body 30 are brought into contact with each other. In this state, the outer peripheral surface of the cylindrical member 40 and the inner peripheral surface of the tubular body 30 are sealed by the O-ring 24. Since the cylindrical member 40 alone is inserted into the tube body 30, the tube body 30 can be inserted even if it is made of a rubber hose or the like that is not slippery and easily sticks.

  Further, when the tube body 30 is a rubber hose or the like having low rigidity, the shape of the tube body 30 is maintained without being crushed even if the tube body 30 in the portion where the cylindrical member 40 is inserted is gripped by hand.

  Next, as shown in FIG. 1B, the side of the tubular body 30 on which the cylindrical member 40 is inserted is opposed to the tubular body insertion hole 26 of the joint body 20, and the tubular body 30 is axially moved (see FIG. 1). It is moved to the arrow A) shown in FIG.

  As shown in FIG. 2A, the tubular body 30 is inserted into the joint body 20 until the collar portion 42 and the wall surface 14C come into contact with each other while sliding the inner peripheral surface of the cylindrical member 40 on the cylindrical body 44. In this state, the outer surface of the cylindrical body 44 and the inner peripheral surface of the cylindrical member 40 are sealed by the O-ring 46. Further, the claw portion 19 provided in the lock ring 18 bites into the outer peripheral surface of the inserted tube body 30 to prevent the tube body 30 from being pulled out from the tube body insertion hole 26.

  Further, since the flange portion 42 protects the end surface 30A of the tube body 30, when the tube body 30 is inserted into the joint main body 20, the claw portion 19 or the collet 16 is caught on the end surface 30A and the tube body 30 is turned up. Is prevented.

  Furthermore, since the cylindrical body 44 determines the radial position of the tubular body 30 inserted into the joint body 20, the claw portion 19 bites into the outer peripheral surface of the tubular body 30 evenly.

  Next, as shown in FIG. 2B, when a fluid flows through the tube body 30, a pulling force (force in the direction of arrow B shown in FIG. 2B) is applied to the tube body 30 by the pressure of the fluid. As a result, the collet 16 and the lock ring 18 disposed on the outer surface of the tube body 30 are driven along the conical surface 17A of the sleeve member 17, compressing the tube body 30 in the radial direction, and the claw portion 19 The tube 30 completely bites into the outer surface, and the connection between the tube 30 and the joint body 20 is completed.

  In addition, since each member is sealed by the O-ring 46 and the O-ring 24 described above, the fluid flowing through the pipe body 30 and the pipe joint 10 does not leak outside.

  Next, a procedure for separating the tubular body 30 from the joint body 20 will be described.

  First, as shown in FIG. 3A, the distal end portion of a cylindrical removal device 48 having a flange 48A extending in the radial direction at the rear end portion is inserted into the gap between the tube body 30 and the sleeve member 17. Include. Further, the rear end portion of the collet 16 is pushed by the distal end portion of the removing device 48, and thereby the distal end portion of the collet 16 pushes the rear end portion of the lock ring 18.

  As shown in FIG. 3B, when the removal tool 48 is further pushed, the lock ring 18 comes into contact with the convex portion 14A of the intermediate portion 14, and the lock ring 18 cannot move any more in the axial direction. .

  When the removal tool 48 is further pushed in a state where the lock ring 18 cannot move in the axial direction, the tip of the collet 16 enters the inside of the lock ring 18. As a result, the collet 16 tip portion is inserted between the lock ring 18 and the outer peripheral surface of the tube body 30, and the claw portion 19 of the lock ring 18 is moved radially outward by the tip portion of the removal device 48. Pushed up. And the nail | claw part 19 spaces apart from the tubular body 30, and a coupling | bonding is cancelled | released.

  In this state, when the tubular body 30 is pulled out, the tubular joint 10 and the tubular body 30 are separated as shown in FIG.

  As described above, since the tubular body 30 is inserted into the joint body 20 in a state where the shape of the tubular body 30 is held by the cylindrical member 40, the tubular body 30 is reinforced with a rubber hose (fiber (especially polyester fiber)) having low rigidity. Hose, especially for low pressure (internal pressure of 1 MPa or less) thin hose and hose by cloth winding vulcanization method), etc., even when the tube body 30 is inserted until the claw portion 19 bites into the outer surface, The tube 30 can be easily inserted into the joint body 20 without bending the tube 30.

  In addition, when the tube body 30 is a rubber hose or the like having low rigidity, the surface of the tube body 30 is difficult to slip and has a property of being easily stuck. Furthermore, since the outer surface of the rubber hose is often made by cloth winding molding, the mesh of the cloth is transferred, and the surface of the tube body 30 may be in a non-smooth state. Even in such a case, since the shape of the tubular body 30 is maintained by inserting the cylindrical member 40 in advance as described above, the tubular body 30 can be easily inserted into the joint body 20.

  Further, even when the surface of the tube body 30 is not smooth, sealing the inner peripheral surface of the tube body 30 and the outer peripheral surface of the cylindrical member 40 as in this embodiment facilitates airtightness inside the tube body 30. Can be secured.

  Moreover, since the nail | claw part 19 and the pipe body 30 are separated using the removal tool 48, and the pipe body 30 is isolate | separated from the coupling main body 20, it is easy without the nail | claw part 19 being caught on the outer surface of the pipe body 30. The pipe body 30 can be separated.

  Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It is clear to the contractor. For example, in the above embodiment, the O-ring 24 is provided between the outer peripheral surface of the cylindrical member 40 and the inner peripheral surface of the tubular body 30 to ensure airtightness, but the tubular body 30 is a rubber hose or the like, When the tube body 30 itself is formed of a material having airtightness, the O-ring is not provided, and the outer peripheral surface of the cylindrical member 40 and the inner peripheral surface of the tube body 30 are directly brought into contact with each other to ensure airtightness. Also good.

  In the above embodiment, the cylindrical body 44 is brought into contact with the inner peripheral surface of the cylindrical member 40 to determine the radial position of the cylindrical member 40. However, the cylindrical body 40 is directed toward the joint body 20 on the cylindrical member 40. Furthermore, the radial position of the cylindrical member 40 may be determined by providing the joint body 20 with a cylindrical hole that contacts the outer peripheral surface of the cylindrical body and determines the position of the cylindrical member.

  Next, 2nd Embodiment of the pipe joint 10 of this invention is described according to FIG. 7, FIG.

  In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the present embodiment, as shown in FIG. 8, unlike the first embodiment, the central portion of the inner peripheral surface of the collet 60 is not provided with a convex portion that goes around the inner peripheral surface. In addition, tapered surfaces 60B spreading outward in the radial direction are provided at both ends of the inner peripheral surface.

  With this configuration, when the pipe body 30 is separated from the joint body 20, first, as shown in FIG. 7A, the gap extends between the pipe body 30 and the sleeve member 17 and extends radially to the rear end. The distal end portion of a cylindrical removal device 62 having a flange 62A is inserted.

  Further, as shown in FIG. 7B, the distal end portion of the removal device 62 is moved along the tapered surface 60B and inserted into the gap between the outer peripheral surface of the tubular body 30 and the inner peripheral surface of the collet 60. The tip of the outer device 62 is brought into contact with the inner surface of the lock ring 18. When the removal tool 62 is further pressed, the lock ring 18 comes into contact with the convex portion 14A of the intermediate portion 14, and the lock ring 18 cannot move any more in the axial direction.

  When the removal tool 62 is further pushed in a state where the lock ring 18 cannot move in the axial direction, the distal end portion of the removal tool 62 enters the inside of the lock ring 18. As a result, the distal end portion of the removal device 62 is inserted between the lock ring 18 and the outer peripheral surface of the tube body 30, and the claw portion 19 of the lock ring 18 moves radially outward to the distal end of the removal device 62. Pushed up by the part. And the nail | claw part 19 spaces apart from the tubular body 30, and a coupling | bonding is cancelled | released.

  In this state, when the tubular body 30 is pulled out, the tubular joint 10 and the tubular body 30 are separated as shown in FIG. 7C.

(A) It is the half cut sectional view which showed the cylindrical member and pipe which comprise the pipe joint which concerns on 1st Embodiment of this invention. (B) It is the half cut sectional view which showed the structure of the pipe joint which concerns on 1st Embodiment of this invention, and showed the state which inserts a pipe body in a joint main body. (A) The structure of the pipe joint which concerns on 1st Embodiment of this invention is shown, and it is the half-cut sectional view which showed the state by which the pipe body was inserted in the joint main body. (B) It is the half cut sectional view which showed the structure of the pipe joint which concerns on 1st Embodiment of this invention, and showed the state which the nail | claw part of the lock ring digged into the pipe body. (C) The structure of the pipe joint which concerns on 1st Embodiment of this invention is shown, It is the half-cut sectional view which showed the state which the nail | claw part of the lock ring completely digged into the pipe. (A) (B) (C) It is the half cut sectional view which showed the structure of the pipe joint which concerns on 1st Embodiment of this invention, and showed the procedure which extracts a pipe body from a joint main body. (A) It is the side view which showed the lock link which comprises the pipe joint which concerns on 1st Embodiment of this invention. (B) It is the top view which showed the lock link which comprises the pipe joint which concerns on 1st Embodiment of this invention. (A) It is the top view seen from one side which showed the collet which comprises the pipe joint which concerns on 1st Embodiment of this invention. (B) It is the side view which showed the collet which comprises the pipe joint which concerns on 1st Embodiment of this invention. (C) It is the top view seen from the other side which showed the collet which comprises the pipe joint which concerns on 1st Embodiment of this invention. It is the disassembled perspective view which showed the structure of the pipe joint which concerns on 1st Embodiment of this invention. (A) (B) (C) It is the half-cut sectional view which showed the structure of the pipe joint which concerns on 2nd Embodiment of this invention, and showed the procedure which extracts a pipe body from a joint main body. (A) It is the top view seen from one which showed the lock link which comprises the pipe joint which concerns on 2nd Embodiment of this invention. (B) It is the side view which showed the collet which comprises the pipe joint which concerns on 2nd Embodiment of this invention. (C) It is the top view seen from the other side which showed the collet which comprises the pipe joint which concerns on 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pipe joint 17 Sleeve member 18 Lock ring 19 Claw part 20 Joint main body 26 Tube insertion hole (insertion hole)
30 tubular body 30A end face 40 cylindrical member 42 collar 44 cylindrical body

Claims (4)

A cylindrical member that is inserted into the tubular body and maintains the shape of the tubular body in contact with the inner peripheral surface of the tubular body;
A joint body in which an insertion hole into which the tube is inserted is formed;
Provided inside the joint body and provided with a claw portion extending to the inner peripheral side, and prevents the tube body from being pulled out by biting the claw portion into the outer peripheral surface of the tube body inserted from the insertion hole. Lock ring to
A sleeve member attached to the joint main body and holding the lock ring in contact with an outer peripheral portion of the lock ring;
A pipe joint comprising:   The pipe joint according to claim 1, wherein an end portion of the cylindrical member is provided with a flange portion that comes into contact with an end surface of the tubular body.   The pipe joint according to claim 1 or 2, wherein a cylindrical body that determines a position of the cylindrical member by contacting an inner peripheral surface of the cylindrical member inserted in the joint main body is provided in the joint main body.   The cylindrical member is provided with a cylindrical body toward the joint body, and the joint body is provided with a cylindrical hole that contacts the outer peripheral surface of the cylindrical body and determines the position of the cylindrical member. The pipe joint according to claim 1 or 2, wherein the pipe joint is characterized.

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