JP2006316877A - Pipe fitting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide pipe fittings capable of preventing projection of a seal ring from a peripheral groove without giving a bad influence to installation of a pipe body. <P>SOLUTION: An open ring and a lock ring are provided in a fittings main body and the seal ring is inserted into the peripheral groove formed in an inner tube of the fittings main body and a pipe with a flange of a shorter posterior waist length than the interval A between a step part of the fittings main body at which the front edge of the pipe body arrives and the peripheral groove into which the seal ring is inserted is sheathed in the inner tube and the pipe body is inserted, while pushing the pipe at its front edge and the pipe fittings is characterized in that contacts between the front edge of the pipe body and the seal ring are prevented at the time of inserting the pipe body. 1: an open ring, 2: a lock ring, 3: a cap, 4: a peripheral groove, 5: a seal ring, 10: pipe fittings, 10a: a fittings main body, 10b: an inner tube, 11: a step part (the deepest part) of the fittings main body, 20: a pipe body, 30: a pipe, 30a: a flange, A: an interval between the step part (the deepest part) of the fittings main body and the peripheral groove, B: pipe posterior waist length. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pipe joint in which a seal ring that is housed in a pipe joint and that exerts a seal function in contact with an inserted pipe body is prevented from protruding from a circumferential groove.

  Generally, a pipe joint that can be easily attached to and detached from the pipe body is widely used. FIG. 1 is a half-cut view showing an overall image of such a pipe joint 10, in which a release ring 1 and a lock ring 2 capable of expanding and contracting are arranged in order from the pipe insertion port side of the joint body 10 a, and a cap 3 prevents these omissions.

  In the pipe joint 10 shown in FIG. 1, in order to mount the pipe body 20, the pipe body 20 may be inserted into the inner cylinder 10b of the joint body 10a. Then, the tubular body 20 passes through the inside of the release ring 1 and is further inserted while expanding the inner peripheral side of the lock ring 2, and finally the seal ring that is housed in the peripheral groove 4 formed in the inner cylinder 10 a. 5 and reaches the deepest part of the joint body 10a to complete the connection.

  When an internal pressure is applied to the pipe body 20 in this state, the pipe body 20 receives a force in a direction away from the deepest portion of the joint body 10a. However, as a result of the inner peripheral end of the lock ring 2 biting into the outer surface of the pipe body 20, The detachment of the body 20 is prevented. Further, the seal ring 5 is sandwiched between the inner cylinder 10b and the tube body 20 and is crushed, thereby preventing leakage of internal fluid (Patent Document 1).

JP 2002-5373 A

  However, when the tube body 20 is made of resin or the like, the inner diameter dimension of the tube body 20 is relatively large, and when the tube body 20 having a slightly smaller inner diameter dimension is inserted, FIG. As shown in (b), the seal ring 5 may be pushed inward at the tip of the tubular body 20 and pushed out of the circumferential groove 4. If a fluid such as water flows through the tube body 20 in such a state, leakage of water occurs.

  The same thing can happen even when the tube 20 is inserted slightly obliquely.

  Further, the tube body 20 is used after being cut to an appropriate length. However, when the distal end of the tube body 20 is cut obliquely, for example, the seal ring 5 is not pushed evenly. There is a case of being pushed out from the inside.

  For this reason, in order to prevent the seal ring 5 from being pushed out from the inside of the circumferential groove 4, a pipe joint 10 provided with a built-up portion 6 having a lower height than the seal ring 5 is provided before and after the circumferential groove 4. (Patent Document 2).

JP 2004-308794 A

  A pipe joint 10 having such a structure is shown in FIG. 3, but the case where the seal ring 5 is pushed out of the circumferential groove 4 by the pipe joint 10 is reduced. It is pointed out that it takes time and increases the cost of the pipe joint 10.

  Therefore, an object of the present invention is to provide a pipe joint that can prevent the seal ring from protruding from the circumferential groove without adversely affecting the fitting property of the pipe body.

  The present invention has been made to solve the above problems, and the gist of the present invention is that a release ring and a lock ring capable of expanding and contracting are arranged in the joint body and formed in the inner cylinder of the joint body. When a seal ring is fitted into the circumferential groove formed and a pipe body is inserted into the inner cylinder, the pipe body passes through the seal ring and the inner cylinder and the pipe body of the joint body are sealed. A flanged pipe with a length shorter than the interval A between the stepped portion of the joint body that the tip of the body reaches and the circumferential groove into which the seal ring is fitted is sheathed on the inner cylinder, and the pipe pushes the pipe at the tip It is inserted while preventing the contact between the tip of the tube and the seal ring when the tube is inserted.

  The present invention is as described above. When the tube is inserted, the seal ring does not come into contact with the distal end of the tube, and the contact with the seal ring is merely the sliding of the ring that is externally mounted. The phenomenon that the ruling is pushed out of the circumferential groove is completely eliminated, and the water leakage phenomenon due to the trouble at the time of inserting the pipe body is completely solved.

  In the pipe joint of the present invention, when the seal ring is fitted in the circumferential groove of the joint body, and the pipe body is inserted into the joint body, the pipe with flange passes through the seal ring by being pushed by the pipe body. Is to be sealed. Here, the number of seal rings is not limited to one, and may be two or more.

  As the mounting structure of the tubular body of the present invention, a simple and generally used structure can be applied. For example, a release ring that can move back and forth and a lock ring that can be expanded and contracted are arranged in order from the tube insertion port side of the joint body, and when internal pressure is applied after the tube is inserted, the lock ring is attached to the outer surface of the tube The inner peripheral end of the tube is inserted to prevent the tube from being detached.

  In order to detach the tube with this structure, the release ring is pushed in and the lock ring is pushed and spread at the tip. Then, the biting of the lock ring with respect to the outer surface of the tubular body is released, and the tubular body can be easily pulled out.

  Now, the flanged pipe is sheathed on the inner cylinder of the joint body. The length L of the pipe is shorter than the distance A between the step portion of the joint body and the circumferential groove into which the seal ring is fitted. . The flanged pipe is externally mounted on the inner cylinder, and is inserted while pressing the flange of the pipe at the tip of the tube to prevent contact between the tip of the tube and the seal ring.

  The flanged pipe is sheathed on the inner cylinder of the joint main body, and a flange that abuts the end surface of the inserted tube is formed at the tip. Therefore, even if the pipe body is inserted at an angle, the pipe attached to the inner cylinder slides without pushing the seal ring out of the circumferential groove so that the cylinder body can be inserted to the deepest part of the joint base. It is.

  Hereinafter, the present invention will be described in more detail with reference to the drawings. 4 to 6 are half-cut diagrams showing an embodiment of the present invention. Reference numerals 1 to 6, 10 to 10b are the same as those shown in FIG. Now, 30 is a short pipe with a flange 30a newly incorporated in the joint body 10a according to the present invention.

  If the distance between the stepped portion (deepest portion) 11 of the joint body 10a to which the tip of the tubular body 20 reaches and the circumferential groove 4 into which the seal ring 5 is fitted is A, a flange having a height B shorter than this dimension A The attached pipe 30 is externally mounted on the inner cylinder 10b.

  Now, in order to attach the pipe body 20 to the joint 10, as shown in FIG. 5, the pipe body 20 may be inserted into the inner cylinder 10b of the joint body 10a. The tube body 20 passes through the inside of the release ring 1 and is further inserted while expanding the inner peripheral side of the lock ring 2, and finally is stored in the peripheral groove 5 formed in the inner cylinder 10a as shown in FIG. Passing through the seal ring 6 and reaching the deepest part 11 of the joint body 10a, the connection is completed.

  In this process, the tube body 20 is inserted while pushing the flange 30a of the pipe 30 at the tip end 20a, whereby the tube body 20 is inserted between the tip end 20a of the tube body 20 and the seal ring 5. In this state, the pipe 30 is slid with the pipe 30 interposed therebetween, and contact between the two is prevented.

  When the pipe body 20 is completely inserted (FIG. 6), the pipe 30 is fitted between the deepest part 11 of the joint body 10a and the seal ring 5, and the pipe 30 and the seal ring 5 are in contact with each other. It will be fun. When an internal pressure is applied after the tube 20 is inserted, the inner peripheral end of the lock ring 2 bites into the outer surface of the tube 20 to prevent the tube 20 from being detached.

  In order to disengage the joint 10 and the tube body 20, the release ring 2 may be pushed in and the lock ring 1 may be spread out at its tip. Then, the biting of the lock ring 1 with respect to the outer surface of the tubular body 20 is released, and the tubular body 20 can be easily pulled out.

  The shape of the pipe 30 used in the present invention is not particularly limited. For example, there are those shown in FIGS. 7 to 9 (a front view (a) and a side view (b)) in addition to the above. The pipe 30 of FIG. 7 has a slightly smaller diameter at the tip of the pipe 30 so that it can be easily fitted with the inserted pipe body 20, and this allows both of them to fit smoothly. It is. FIG. 8 shows a structure in which a slit 30b is formed in the pipe 30 including the flange 30a, and FIG. 9 shows a structure in which the tubular body 30 is provided with a plurality of slits 30b while leaving the flange 30a. In both cases, the diameter of the pipe 30 can be reduced.

  The pipe joint of the present invention is a pipe joint in which a seal ring is fitted in a circumferential groove of a joint body, and when the pipe body is inserted into the joint body, the pipe body passes through the seal ring and the joint body and the pipe body are connected. In addition, by inserting the pipe body with the pipe sandwiched between the seal ring and the pipe body in the circumferential groove, the seal ring is effectively prevented from protruding from the circumferential groove, and the seal ring is damaged or defective. The cause of can be eliminated.

FIG. 1 is a half cut view of a conventional pipe joint. FIG. 2 is a half-cut view showing a defect of a conventional pipe joint. FIG. 3 is a half cut view of another example of a conventional pipe joint. FIG. 4 is a half cut view of the pipe joint of the present invention. FIG. 5 is a half-cut view of the pipe body inserted into the pipe joint shown in FIG. FIG. 6 is a half-cut view when the pipe body is completely inserted into the pipe joint shown in FIG. FIG. 7 is a front view and a side view of a pipe used in the present invention. FIG. 8 is a front view and a side view of another example of the pipe used in the present invention. FIG. 9 is a front view and a side view of still another example of the pipe used in the present invention.

Explanation of symbols

1 ... Release ring,
2. Lock ring,
3. Cap,
4 ... Circumferential groove,
5. Seal ring,
10. Pipe fitting,
10a ... Fitting body,
10b ... Inner cylinder,
11. The step (deepest part) of the joint body,
20. Tube,
30 ... pipe,
30a ... Flange
30b ... slit,
A: Distance between the step (deepest part) of the joint body and the circumferential groove
B ... The height of the pipe.

Claims (4)

  When a release ring and a lock ring capable of expanding / contracting diameter are arranged in the joint body, a seal ring is fitted in a circumferential groove formed in the inner cylinder of the joint body, and the pipe is inserted into the inner cylinder. A pipe joint in which the body passes through the seal ring and the inner cylinder of the joint body and the pipe body are sealed, and the step of the joint body that the tip of the pipe body reaches and the circumferential groove into which the seal ring is fitted A flanged pipe with a length shorter than the interval A is mounted on the inner cylinder, and the pipe is inserted while pushing the pipe at its tip, preventing contact between the tip of the pipe and the seal ring when the pipe is inserted. A pipe joint characterized by   The pipe joint according to claim 1, wherein a diameter of a pipe tip of the flanged pipe is reduced.   The pipe joint according to claim 1 or 2, wherein one or a plurality of slits are formed in a pipe portion of the flanged pipe.   The pipe joint according to claim 1, wherein the slit is also formed in the flange.

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