JP2010054020A - Lock ring for pipe fitting and pipe fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe fitting lock ring having a pawl part and a pipe fitting, suppressing an excessive bite of the pawl part into a pipe when the pipe inserted into an insert hole in the pipe fitting is to be held by the pawl part. <P>SOLUTION: On both sides in the circumferential direction of the pawl part 36, restriction parts 38 are formed adjacent to the pawl part 36, wherein each restriction part 38 is extended in bent form from the direction along the V-form of a ring part 31 toward the inside of the V-form. The forefront 38A of the restriction part 38 is cut off approximately at a right angle to have a flat shape. When the pawl part 36 bites into the pipe 40, the V-form outer flank 38A of the restriction part 38 abuts on the peripheral surface of the pipe 40 so as to restrict the bite of the pawl part 36 into the pipe 40. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lock ring for a pipe joint and a pipe joint, and more particularly to a lock ring for a pipe joint and a pipe joint that prevent the pipe inserted into the pipe joint from coming out.

  2. Description of the Related Art Conventionally, a pipe joint that can connect a pipe to an insertion hole of a joint body by a one-touch operation and detach the pipe is generally used.

  In such a pipe joint, a lock ring is disposed inside the insertion hole, and a claw is formed on the inner peripheral side of the lock ring. And the detachment | leave from the insertion hole of a pipe is suppressed by the nail | claw of a lock ring biting into the outer peripheral surface of the resin-made pipe inserted in the insertion hole (for example, refer patent document 1). However, in the pipe joint described in Patent Document 1, it is conceivable that the amount of the claw of the lock ring that bites into the pipe becomes excessive.

Moreover, in patent document 2, the control part for controlling biting in is provided in the both sides of the nail | claw of a lock ring. However, since the restricting portion has a shape in which the end portion in the circumferential direction of the claw portion is notched, there is a possibility that the restricting portion also bites into the tube body when a force in the pulling direction acts on the tube body.
JP 2004-308793 A JP 2008-1111531 A

  This invention is made in view of the said problem, and provides the lock ring for pipe joints and pipe joints which can suppress more reliably that a nail | claw part bites into a pipe body more than a fixed amount. With the goal.

  In order to solve the above problems, the invention according to claim 1 is a lock ring for a pipe joint that constitutes a part of a pipe joint into which a pipe body is inserted and prevents the pipe body from being pulled out. A plurality of claw portions that extend from the radially inner side of the ring portion and bite into the outer peripheral surface of the tube body to prevent the tube body from being pulled out. And is formed at a position adjacent to the claw portion, and contacts the outer peripheral surface of the tubular body at an angle toward the radially outer side of the tubular body from the claw portion, so that the claw portion bites into the tubular body. And a regulating section for regulating.

  In the lock ring for a pipe joint according to claim 1, when the pipe body is inserted into the pipe joint, a plurality of claw parts extended from the ring part of the lock ring for the pipe joint by the action of internal pressure or the like are formed on the pipe body. The pipe body is prevented from coming out by biting into the outer peripheral surface and being held by the claw portion. In the lock ring for a pipe joint, a restricting portion is provided at a position adjacent to the claw portion. The restricting portion abuts on the outer peripheral surface of the tubular body at an angle toward the radially outer side of the tubular body from the claw portion, and restricts the biting of the claw portion into the tubular body. Thereby, it is suppressed that a nail | claw part bites into a pipe body more than fixed amount, and the malfunction of the nail | claw part penetrating through a pipe | tube with an excessive bite amount is suppressed.

  According to a second aspect of the present invention, in the lock ring for a pipe joint according to the first aspect, the restricting portion is formed on both sides in the circumferential direction of the claw portion.

  In the invention described in claim 2, since the restricting portions are formed on both sides of the claw portion in the circumferential direction, when the plurality of claw portions bite into the outer peripheral surface of the tubular body, the restricting portions are formed on both sides of the claw portion. It contacts the outer peripheral surface of the tube. For this reason, the biting into the tubular body of the claw portion is stabilized, and the amount of biting can be controlled more reliably.

  According to a third aspect of the present invention, in the lock ring for a pipe joint according to the first or second aspect, the restricting portion is directed from the ring portion toward the back side in the insertion direction of the tubular body. It is a feature.

  In the invention according to the third aspect, since the restricting portion is directed from the ring portion toward the back side in the insertion direction of the tubular body, the tubular body can be easily inserted.

  According to a fourth aspect of the present invention, there is provided a pipe joint including a joint main body in which an insertion hole into which a pipe body is inserted is formed, an annular ring part attached to the joint main body, and a radially inner side from the ring part. A plurality of claw portions that extend and bite into the outer peripheral surface of the tubular body to prevent the tubular body from being pulled out, and are formed at positions adjacent to the claw portion, and radially outside the tubular body from the claw portion A lock ring for a pipe joint having a regulating portion that abuts on the outer peripheral surface of the pipe body at an angle toward the pipe body and regulates the biting of the claw portion into the pipe body, and is extrapolated to the joint main body, And a sleeve having a tapered surface that holds the coupling lock ring on the coupling body and prevents the claw portion from coming off from the tubular body by contacting the ring portion.

  In the invention according to claim 4, an insertion hole into which the pipe body is inserted is formed in the joint body, and the ring portion of the lock ring for pipe joint is attached to the joint body. Moreover, the lock ring for pipe joints is hold | maintained at the joint main body by the sleeve extrapolated by the joint main body. When the pipe body is inserted into the insertion hole, the ring portion of the lock ring for pipe joint comes into contact with the taper surface of the sleeve by the action of internal pressure, etc., and the claw part of the lock ring for pipe joint bites into the pipe body, and the pipe of the claw part Dropping from the body is suppressed. At that time, the restriction portion formed at a position adjacent to the claw portion of the pipe joint lock ring comes into contact with the outer peripheral surface of the tube body, whereby the claw portion is restricted from biting into the tube body. For this reason, it is suppressed that a nail | claw part bites into a pipe body more than fixed amount, and the malfunction of the nail | claw part penetrating too much and a nail | claw part penetrating a pipe body is suppressed.

  According to a fifth aspect of the present invention, in the pipe joint according to the fourth aspect, the pipe body is made of resin or rubber.

  In the invention according to claim 5, the pipe body is made of resin or rubber, and the claw portion of the pipe joint lock ring is likely to bite into the outer peripheral surface of the pipe body.

  According to a sixth aspect of the present invention, in the pipe joint according to the fourth or fifth aspect, on the inner peripheral side of the sleeve, the pipe of the claw portion enters between the claw portion and the tubular body. It is characterized by a release ring that releases bite into the body.

  According to the sixth aspect of the present invention, the release ring provided on the sleeve enters between the claw portion and the tube body, so that the biting of the claw portion into the tube body is released and the tube body can be pulled out from the insertion hole. It becomes possible. For this reason, the pipe body can be detached from the pipe joint by a simple operation.

  In the lock ring for a pipe joint and the pipe joint according to the present invention, the claw portion of the lock ring for the pipe joint can be prevented from biting into the pipe body by a certain amount, and problems such as penetration of the claw section into the pipe body can be suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an exploded perspective view of a pipe joint 10 including a lock ring 30 for a pipe joint according to an embodiment of the present invention. Further, FIG. 2 shows a half cut sectional view of the pipe joint 10 including the lock ring 30 for the pipe joint according to the embodiment of the present invention before the pipe body 40 is inserted.

  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. The main body portion 12 and the intermediate portion 14 constitute a joint main body 16. Further, the pipe joint 10 includes a tubular sleeve 18. The sleeve 18 is extrapolated to the intermediate portion 14. As shown in FIG. 2, an insertion hole 20 into which the tube body 40 is inserted is formed between the intermediate portion 14 and the sleeve 18 and the main body portion 12.

  A lock ring 30 for holding the tube body 40 in the insertion hole 20 is disposed inside the sleeve 18. The lock ring 30 has a substantially V-shaped section whose section is rotated by 90 degrees, and the substantially V-shaped opening 30A (see FIG. 4) is the back side of the joint body 16 (the opposite side to the insertion side of the tubular body 40). It is arranged to go to. The opening 30A of the lock ring 30 is opposed to the distal end portion 14A of the intermediate portion 14, and a part of the substantially V-shaped inner surface is in contact with the distal end portion 14A. Details of the lock ring 30 will be described later.

  On the inner wall of the sleeve 18, a tapered surface 18 </ b> A is formed on which the substantially V-shaped outer surface of the lock ring 30 can abut. The tapered surface 18A is formed so as to reduce in diameter toward the inlet 20A side of the insertion hole 20.

  On the inner peripheral side of the sleeve 18, a release ring 22 that is movable along the axial direction of the pipe joint 10 is inserted closer to the inlet 20 </ b> A of the insertion hole 20 than the lock ring 30. The release ring 22 has a substantially cylindrical shape, and the inner wall forms a part of the insertion hole 20. A protrusion 22A is formed on the outer periphery of the release ring 22 in the circumferential direction, and coming out of the sleeve 18 is prevented by contacting the small diameter portion 18B formed on the inner periphery of the sleeve 18. The tip 22 </ b> B of the protrusion 22 </ b> A has a tapered shape and is disposed along the radially outer peripheral surface of the lock ring 30. Two circumferential grooves 12 </ b> A are formed in the outer peripheral surface facing the insertion hole 20 in the main body portion 12, and rubber O-rings 24 are fitted into these circumferential grooves 12 </ b> A, respectively.

  A wall surface 13 having an enlarged outer diameter is formed in the innermost portion of the insertion hole 20 on the back side of the circumferential groove 12A of the main body portion 12. The tip of the tubular body 40 abuts on the wall surface 13, and the wall surface 13 serves as a stopper for the tubular body 40. Further, a female screw 12B to which another pipe is connected is formed on the opposite side of the main body portion 12 from the insertion hole 20. Further, a flange portion 12 </ b> C for connection with another pipe body (not shown) is formed at the end of the main body portion 12 opposite to the insertion hole 20.

  In this pipe joint 10, the main body portion 12 can be made of bronze, the intermediate portion 14, the sleeve 18 and the release ring 22 can be made of resin, and the lock ring 30 can be made of stainless steel. Each member of the pipe joint 10 is not limited to these materials, and other materials may be used. The tube body 40 is made of resin. The tube body 40 may be made of rubber or other relatively soft member into which the claw portion 36 of the lock ring 30 can bite.

  FIG. 3 shows a single lock ring 30 used in the pipe joint 10 shown in FIG. 3A is a perspective view of the lock ring 30, FIG. 3B is a plan view of the lock ring 30, and FIG. 3C is a half sectional view of the lock ring 30.

  The lock ring 30 includes an annular ring portion 31. The ring portion 31 includes a ring portion 31 that is notched in the radial direction from the inner peripheral side at a predetermined interval in the circumferential direction, and the ring portion 31 that is different from the notch portion 32 in the radial direction from the outer peripheral side. Notches 34 are formed (eight in each embodiment in this embodiment). The lock ring 30 has a substantially V-shaped cross section obtained by cutting a portion where the notches 32 and 34 are not formed along the axial direction.

  A claw portion 36 is formed at a central portion of the convex portion 33 formed between adjacent notch portions 32 of the ring portion 31, that is, at a radially inner position corresponding to the notch portion 34. As shown in FIG. 4A, the claw portion 36 is bent and extended in a direction from the direction along the V shape of the ring portion 31 toward the outside of the V shape as seen from the circumferential direction. The tip of the claw portion 36 is sharp and has a shape that can easily bite into the tubular body 40.

  On both sides of the claw portion 36 in the circumferential direction, restricting portions 38 are formed adjacent to the claw portion 36. As shown in FIG. 4B, the restricting portion 38 is bent and extended in a direction from the direction along the V shape of the ring portion 31 toward the inside of the V shape. The front end portion 38B of the restricting portion 38 has a flat shape cut off at a substantially right angle. Then, when the claw portion 36 bites into the tube body 40, the V-shaped outer surface 38 </ b> A of the restriction portion 38 abuts on the outer peripheral surface of the tube body 40, thereby restricting the claw portion 36 from biting into the tube body 40. It is like that.

  The lock ring 30 has a substantially V-shaped cross section, and a total of 16 cuts 32 and 34 are provided on the inner peripheral side and the outer peripheral side of the ring portion 31, so that the inner space of the V-shape is collapsed. (So that the portions extending on both sides of the V-shape approach each other) can be elastically deformed. Therefore, as the tube body 40 is inserted into the insertion hole 20, the lock ring 30 is elastically deformed and expands in a concentric shape.

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

  When the pipe body 40 is inserted into the insertion hole 20 of the pipe joint 10, the tip of the pipe body 40 expands the diameter of the lock ring 30 as shown in FIG. 5. The tubular body 40 is inserted into the back side while the outer peripheral surface of the tubular body 40 is in sliding contact with the claw portion 36 of the lock ring 30, and the inner peripheral surface of the tubular body 40 is in contact with the O-rings 24 and 24. When the tubular body 40 is further inserted, the distal end of the tubular body 40 reaches the wall surface 13 of the main body 12.

  In the mounted state shown in FIG. 5, when an internal pressure is applied to the tube body 40, the tube body 40 receives a force in a direction in which the tube body 40 comes out of the joint body 16. As a result, the tube body 40 and the lock ring 30 are slightly moved in the direction of coming out of the insertion hole 20, and the outer peripheral side of the ring portion 31 of the lock ring 30 contacts the tapered surface 18 </ b> A of the sleeve 18 as shown in FIG. 6. Accordingly, as shown in FIG. 7, the claw portion 36 of the lock ring 30 bites into the outer peripheral side of the tube body 40. At this time, since the claw portion 36 of the lock ring 30 is inclined toward the back side of the joint body 16, the claw portion 36 is easy to bite into the tube body 40, and the claw portion 36 has a direction opposite to the direction in which the tube body 40 is pulled out. The tube body 40 is difficult to come off.

  On the other hand, when the claw portion 36 of the lock ring 30 bites into the outer peripheral surface of the tube body 40, the V-shaped outer surface 38A of the regulating portion 38 formed on both sides of the claw portion 36 abuts on the outer peripheral surface of the tube body 40, It is regulated that the claw portion 36 bites a certain amount or more. That is, the amount of biting of the claw part 36 into the tubular body 40 can be controlled by the restricting part 38, and an excessive amount of biting of the claw part 36 is suppressed.

  Further, since the restricting portions 38 are provided on both sides of the plurality (eight in this embodiment) of the claw portions 36, the amount of biting of each claw portion 36 can be controlled, and the tube body 40 by the claw portions 36. The holding power of is stabilized. For this reason, it can suppress that the tubular body 40 slips out (detaches) from the insertion hole 20.

  On the other hand, when the tubular body 40 is detached from the mounted state shown in FIG. 6, a dedicated jig is inserted from the inlet 20 </ b> A side of the insertion hole 20, and the release ring 22 is pushed back. As a result, as shown in FIG. 8, the distal end portion 22 </ b> B of the release ring 22 pushes the claw portion 36 of the lock ring 30 to expand the diameter of the lock ring 30. At that time, the distal end portion 22B of the release ring 22 pushes the claw portion 36 of the lock ring 30 and simultaneously enters between the claw portion 36 and the tube body 40, and the claw portion 36 is extracted from the tube body 40. In this state, the tube body 40 can be pulled out (detached) from the insertion hole 20.

  In the pipe joint 10 of the present embodiment, when the claw portion 36 of the lock ring 30 bites into the outer peripheral surface of the tube body 40, the V-shaped outer surface 38 </ b> A of the regulating portion 38 on both sides of the claw portion 36 is the outer periphery of the tube body 40. Since it contacts the surface, the claw portion 36 is prevented from biting in a certain amount or more. For this reason, it is possible to prevent the amount of biting of the claw portion 36 into the tube body 40 from being excessive and penetrating the tube body 40 in some cases.

  In the above-described embodiment, the tip shape of the restricting portion 38 formed on the lock ring 30 is a flat shape cut off at a substantially right angle, but is not limited to this shape. For example, as shown in FIG. 9B, the tip 38B of the restricting portion 38 is tapered such that the inside of the V-shape is tapered and the diameter is increased in a direction away from the tube body 40 (a direction toward the outside of the diameter). It is good also as a shape.

  Moreover, although the said embodiment demonstrated the example which formed the nail | claw part 36 in the center part of the convex part 33, the position of the nail | claw part 36 is not limited to this position. For example, as shown in FIG. 10, the claw portion 36 may be formed on one side in the circumferential direction of the convex portion 33. In this case, the restricting portion 38 can be formed on the side of the convex portion 33 where the claw portion 36 is not formed. Further, the shape of the restricting portion in this case may be the shape shown in FIG.

  Moreover, in the said embodiment, although the number of the nail | claw parts 36 of the lock ring 30 was eight, it is not limited to this structure, It is good also as another number. Moreover, the dimension and shape of the nail | claw part 36 and the control part 38 are not limited to this, It is good also as another structure.

It is a disassembled perspective view of the pipe joint which concerns on embodiment of this invention. It is a pipe joint which concerns on embodiment of this invention, Comprising: It is a half-cut sectional view which shows the state which isolate | separated the pipe body. (A) is a perspective view of a lock ring used in the pipe joint shown in FIG. 1, (B) is a plan view of the lock ring used in the pipe joint shown in FIG. 1, and (C) is a half cut sectional view of the lock ring. . (A) is AA sectional drawing of the lock ring shown to FIG. 3 (B), (B) is BB sectional drawing of the lock ring shown to FIG. 3 (B). It is a pipe joint which concerns on embodiment of this invention, Comprising: It is a half-cut sectional view which shows the state which inserted the pipe body to the middle. It is a pipe joint which concerns on embodiment of this invention, Comprising: It is a half-cut sectional view which shows the state which couple | bonded the pipe body. It is the elements on larger scale which show the state which the nail | claw part of the lock ring shown in FIG. It is a pipe joint which concerns on embodiment of this invention, Comprising: It is a half-cut sectional view which shows the state which released | released the lock ring in order to detach | leave a pipe body. It is sectional drawing which shows the modification of the control part of the lock ring of this invention. It is a top view which shows the modification of the formation position of the nail | claw part of a lock ring of this invention, and a control part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pipe joint 12 Main body part 14 Intermediate part 16 Joint main body 18 Sleeve 20 Insertion hole 22 Release ring 30 Lock ring 31 Ring part 32 Notch part 33 Projection part 34 Notch part 36 Claw part 38 Restriction part 40 Tube

Claims (6)

A part of a pipe joint into which a pipe body is inserted, a lock ring for a pipe joint that prevents the pipe body from being pulled out,
A ring portion that is annular and disposed outside the tube;
A plurality of claw portions extending from the radially inner side of the ring portion and biting into the outer peripheral surface of the tubular body to prevent the tubular body from coming out;
It is formed at a position adjacent to the claw portion, and abuts on the outer peripheral surface of the tube body at an angle toward the radially outer side of the tube body than the claw portion to regulate the biting of the claw portion into the tube body. The regulatory department,
A lock ring for a pipe joint, comprising:   The lock ring for a pipe joint according to claim 1, wherein the restricting portion is formed on both sides of the claw portion in the circumferential direction.   The lock ring for a pipe joint according to claim 1 or 2, wherein the restricting portion is directed from the ring portion toward the back side in the insertion direction of the pipe body. A joint body in which an insertion hole into which the tubular body is inserted is formed;
A lock ring for a pipe joint according to any one of claims 1 to 3,
A taper that is extrapolated to the joint main body, holds the pipe joint lock ring on the joint main body, and abuts against a ring portion of the pipe joint lock ring to prevent the claw portion from coming off from the pipe body. A sleeve with a surface,
A pipe joint characterized by comprising:   The pipe joint according to claim 4, wherein the pipe body is made of resin or rubber.   On the inner peripheral side of the sleeve, there is provided a release ring that enters between the claw portion and the tube body of the lock ring for the pipe joint and releases the biting of the claw portion into the tube body. The pipe joint according to claim 4 or 5, characterized by the above.

Images