JP2007051723A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize a structure of a connection portion between a joint and a resin tube by housing a slanted face and a ring body used as a fastening member necessary for exercising a resin pipe loosening preventing function, in an inner side of the resin tube inserted in a connection opening part. <P>SOLUTION: The pipe joint has the cylindrical connection opening part 1, and the fastening member which can be fastened to a tube wall of the resin tube 9. The fastening member is comprised of the ring body 5 arranged to axially slide in an annular groove part 3 of the connection opening part 1. It is composed such that the ring body, moving in an extraction direction of the resin pipe 9 following the resin pipe 9 inserted into the connection opening part 1, runs upon the slanted face 4 and diametrally expands by providing the slanted face 4 in the annular groove part 3. The slanted face 4 can be formed by a bottom face of the annular groove part 3, or by a surface of an annular member 41 engaged in the annular groove part 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pipe joint, and more particularly, to a pipe joint including a connection port portion into which a resin pipe is inserted and connected.

  In a piping system using a resin pipe such as an indoor hot water supply pipe or the drain pipe, it is required that a pipe joint interposed at a connection portion of the resin pipe exhibits an action of preventing the resin pipe from being pulled out. Therefore, in order to cope with this requirement, various pipe joints having a retaining function have been proposed (see, for example, Patent Document 1). In the pipe joint described in Patent Document 1, a lock ring body provided outside a resin pipe inserted in a connection port is tightened with an outer cylinder fitted to the resin pipe to prevent the resin pipe from being removed. It is like that.

  Moreover, in FIG. 13-19, the pipe joint provided with the various specific structure conventionally known is illustrated with the fragmentary sectional view. Among these, in FIG. 13 to FIG. 17, the cylindrical connection port portion 100 into which the resin tube is inserted is integrally provided with a locking claw 110 having a saw-tooth cross-sectional shape commonly referred to as a bamboo shoot. The claw 110 can be bitten into the tube wall of the resin tube from the inside. 13, 14, 17, and 18, the push ring 200 to be screwed into the pipe joint and the diameter of the push pipe 200 is reduced by the tightening action of the push ring 200 so that the pipe wall of the resin pipe is connected to the connection port 100. And a tightening ring 210 sandwiched between the two. Furthermore, the thing of FIG. 19 presses the latching member 310 with the press ring 300 screwed into the inside of a pipe joint, and this latching member 310 is made into the pipe | tube wall of the resin pipe by which the core is fitted and hold | maintained. It can be eaten into the outer surface.

JP 2003-106490 A

  However, in FIGS. 13, 14, 17, and 18, only the locking claws 110 are caused to bite into the inner wall surface of the resin tube by the tightening action of the tightening ring 210. Even when pulled in the pulling direction by an external force applied to the tube wall, the biting depth of the locking claw 110 with respect to the tube wall is maintained at the initial depth. Therefore, when the resin tube is pulled in the pulling direction with a large force, the locking portion of the tube wall with the locking claw 110 may be torn off by the locking claw 110 and the resin tube may come out. Satisfactory retaining action is not exhibited. This also applies to the case where the resin pipe inserted into the connection port portion 100 having the locking claw 110 is tightened by the tightening ring 400 as in the case of FIGS.

On the other hand, in FIG. 19, when the resin tube is pulled in the drawing direction, the locking member 310 gradually bites into the tube wall from the outside. It is thought that the stopping action is exhibited.
However, in FIG. 19, it is indispensable to dispose the locking member 310 and the push ring 300 that presses the locking member 310 outside the resin pipe. When the size is increased and construction in a narrow space such as an in-house piping system is unavoidable, it can be said that there is a problem regarding versatility. The same applies to the pipe joint proposed by Patent Document 1.

  The present invention has been made in view of the above situation and problems, and employs a configuration capable of engaging a locking member that exerts a retaining action of a resin pipe with the inner wall surface of the resin pipe. Accordingly, it is an object of the present invention to provide a pipe joint that can be conveniently employed when a resin pipe is installed in a narrow space, and that provides a stable retaining effect.

  Another object of the present invention is to reduce the cost of the pipe joint by adopting a configuration that can suppress the number of necessary parts as much as possible.

  A pipe joint according to the present invention is a pipe joint having a cylindrical connection port portion into which a resin pipe is inserted and a locking member that can be engaged with the tube wall of the resin tube inserted into the connection port portion. The locking member is a ring body that is arranged in the annular groove portion of the connection port portion so as to be slidable in the axial direction and is elastically pressed against the inner wall surface of the resin pipe inserted into the connection port portion, An inclined surface is added to the annular groove for allowing the ring body, which follows the resin pipe and moves in the direction of extracting the resin pipe, to spread and expand.

  If it is this structure, since the ring body and inclined surface as a latching member will be settled inside the resin pipe, what was arranged the latching member outside the resin pipe (for example, it describes in Drawing 19 and patent documents 1). Compared to the other), the structure of the connection part between the pipe joint and the resin pipe is miniaturized, and the construction in a narrow space can be performed without difficulty. Further, when the ring body moves in the extraction direction following the resin tube, the ring body rides on the inclined surface added to the annular groove portion of the connection port portion and expands. Therefore, the greater the width of movement of the resin pipe in the extraction direction, the larger the biting width of the ring body with respect to the pipe wall, which increases the stability of the retaining action exhibited by the ring body. Useful.

  In the present invention, even if the inclined surface is formed by the bottom surface of the annular groove portion, the inclined surface is divided from the connection port portion and is fitted and held in the annular groove portion by the surface of the annular member. It may be formed. Since the former requires fewer parts than the latter, there is an advantage that the cost is reduced accordingly, and the assembly work is easier than the latter, which requires the annular member to be assembled in the annular groove.

  In the present invention, the ring body is formed as a tapered claw portion that exerts an action in which an elastic portion against the inner surface of the tube wall of the resin tube is caught in the inner surface of the tube wall and prevents sliding of the resin tube. It is desirable that According to this, the greater the movement width of the resin tube in the extraction direction, the greater the biting width of the claw portion of the ring body with respect to the tube wall, so that the stability of the retaining action exhibited by the ring body is further increased. improves.

  In the present invention, it is desirable that a seal ring that adheres to the inner wall surface of the resin pipe inserted into the connection port portion in a watertight state is attached to the connection port portion. In addition to the stopping action, the water leakage prevention action by the seal ring is exhibited.

  In the present invention, it is desirable to include tightening means for tightening the overlapping portion of the tube wall of the resin tube inserted into the connection port portion with the ring body in the diameter reducing direction from the outer surface side of the tube wall. According to this, since the expansion of the resin pipe can be forcibly prevented by the tightening means, the situation where the resin pipe expands and the stability of the retaining action by the ring body does not occur does not occur.

  As described above, according to the present invention, the ring body and the inclined surface as the locking member necessary for exerting the retaining action of the resin pipe are accommodated inside the resin pipe inserted into the connection port portion. In addition, there is an effect that the structure of the connection portion between the pipe joint and the resin pipe is not increased in size, and the construction in a narrow space as seen in the in-home piping system can be performed without difficulty. Moreover, since the number of parts is reduced and the structure of the connection portion between the pipe joint and the resin pipe is simplified, the pipe joint can be provided at a low cost.

  1 is a side view showing a pipe joint according to an embodiment of the present invention in a partial cross-section, FIG. 2 is a side view showing a pipe joint according to a modification in a partial cross-section, and FIG. 3 (A) is the pipe of FIG. Front view of the annular member employed in the joint, FIG. 4B is a sectional view of the portion along the line IIIB-IIIB in FIG. 4A, FIG. 8 is an enlarged view of the VIII portion of FIG. 7, FIG. 9A is a front view of a ring body as a locking member, FIG. 9B is a partially longitudinal side view of the ring body, and FIG. Sectional drawing of the principal part of the pipe joint which employ | adopted the ring body, (B) is a front view of the ring body by a modification, (C) is a partial vertical side view of the ring body by a modification, FIG. Sectional drawing of the principal part of the pipe joint which employ | adopted the ring body by another modification, (B) is a front view of the ring body by another modification, (C) is other FIG. 12A is a cross-sectional view of a main part of a pipe joint employing a ring body according to another modification, and FIG. 12B is a ring body according to still another modification. FIG. 6C is a partially longitudinal side view of a ring body according to still another modification.

  The pipe joint shown in FIG. 1 and FIG. 2 has two strips in which two seal rings 21 made of O-rings or the like are respectively fitted into a cylindrical connection port 1 into which a resin pipe (not shown) is inserted. The annular grooves 2 and 2 are provided, and the annular grooves 3 are provided on the inner side in the axial direction of the annular grooves 2 and 2, and an inclined surface 4 made of a tapered surface is added to the annular grooves 3. In addition, the ring body 5 as a locking member is provided in the annular groove portion 3 so as to be slidable in the axial direction on the front side of the inclined surface 4. Moreover, it is common also in the point that the base part of the connection port part 1 is equipped with the resin pipe receiving surface 6 formed in the step shape.

  In contrast, in the pipe joint of FIG. 1, the inclined surface 4 is formed by the bottom surface of the annular groove portion 3, whereas in the pipe joint of FIG. 2, the inclined surface 4 is divided from the connection port portion 1 to form an annular shape. They are different in that they are formed by the surface of the annular member 41 fitted and held in the groove 3. As shown in FIGS. 3A and 3B, the annular member 41 is formed by a single ring-shaped member having elasticity, and the annular member 41 resists elasticity when fitted into the annular groove portion 3. The diameter is expanded. Further, after the annular member 41 is fitted into the annular groove portion 3, the annular member 41 is completely accommodated in the annular groove portion 3. Therefore, when the resin pipe is inserted into the connection port 1, a situation in which the annular member 41 protrudes from the annular groove 3 and is not disturbed does not occur.

  As shown in FIGS. 9A and 9B, the ring body 5 has elasticity, and is formed of a single split ring body member having a notch portion at one location. It is provided with two outwardly tapered claw portions 51, 51 by being recessed over the circumference. The ring body 5 is fitted into the annular groove portion 3 of the connection port portion 1 in a state where the diameter is expanded, and after being fitted into the annular groove portion 3, the outer peripheral portion including the claw portions 51, 51 is slightly outside the annular groove portion 3. Stick out.

  The operation of the pipe joint of FIG. 1 will be described next with reference to FIGS.

  When the resin tube 9 is inserted into the connection port 1 and the end surface 91 is abutted against the resin tube receiving surface 6 of the pipe joint as indicated by an arrow F in FIG. 4 or FIG. 5, the resin tube 9 is connected to the connection port 1. At the same time that the insertion allowance is properly determined, the seal ring 21 is in close contact with the inner surface of the resin tube in a liquid-tight state, and the portion is sealed, and at the same time, the ring body 5 is pushed by the resin tube 9 to reduce the diameter. The ring body 5 abuts against the inner wall surface of the resin tube 9 in an elastic state. After the resin tube 9 is inserted into the connection port portion 1, the overlapping portion of the tube wall of the resin tube 9 inserted into the connection port portion 1 with the ring body 5 is tightened using the tightening ring 7. When the resin tube 9 is tightened with the tightening ring 7 as the tightening means in this way, there is an advantage that the situation in which the resin tube 9 is expanded due to the elastic action of the ring body 5 does not occur. When the resin tube 9 is a hard resin tube that does not easily expand, the fastening ring 7 is not necessarily attached. Thus, the connection work between the pipe joint and the resin pipe 9 is completed.

  Thus, an external force in the extraction direction acts on the resin pipe 9 connected to the pipe joint, and the resin pipe 9 slides on the connection port 1 as shown by an arrow R in FIG. 6 and moves in the extraction direction. In this case, the ring body 5 that is in contact with the inner surface of the tube wall of the resin tube 9 in an elastic state follows the resin tube 9 and moves in the annular groove 3. Therefore, depending on the size of the movement width of the resin tube 9 in the extraction direction, after the ring body 5 comes into contact with the inclined surface 4 of the annular groove portion 3 as shown in FIG. Ride on the inclined surface 4 to expand the diameter. As a result, as shown in an enlarged view in FIG. 8, the claw portion 51 of the ring body 5 bites into the inner surface of the tube wall of the resin tube 9, and the resin tube 9 slides on the ring body 5 and moves in the extraction direction. The situation of doing is stopped. Since the ring body 5 is limited in its inner diameter by the resin tube 9 and the diameter of the ring body 5 is unlimited, the resin tube 9 is reliably prevented from being removed by the ring body 5.

  4 to 8, the operation of the pipe joint of FIG. 1 has been described, but the same action is performed even if the inclined surface 4 is provided on the annular member 41 as in the pipe joint of FIG. 2. .

  FIGS. 10A, 10B, and 10C show examples using a ring body 5 according to a modification. The ring body 5 used in this example is made of sheet metal, and a number of claw portions 51 are bent at the outer peripheral portion as shown in FIGS. Then, as shown in FIG. 5A, when the resin tube 9 moves in the direction of extraction after receiving some external force after being inserted into the connection port 1, it moves in the annular groove 3 following the resin tube 9. The ring body 5 rides on the inclined surface 4 formed by the bottom surface of the annular groove portion 3 so that the claw portion 51 bites into the inner wall surface of the resin tube 9 so that the resin tube 9 is prevented from being removed. It has become.

  FIGS. 11A, 11B, and 11C show examples using the ring body 5 according to another modification. The ring body 5 used in this example has a serrated claw portion 51 on the outer peripheral portion as shown in FIGS. Then, as shown in FIG. 5A, when the resin tube 9 moves in the direction of extraction after receiving some external force after being inserted into the connection port 1, it moves in the annular groove 3 following the resin tube 9. The ring body 5 rides on the inclined surface 4 formed by the bottom surface of the annular groove portion 3 so that the claw portion 51 bites into the inner wall surface of the resin tube 9 so that the resin tube 9 is prevented from being removed. It has become.

  12A, 12B, and 12C show an example using the ring body 5 according to still another modification. The ring body 5 used in this example has a claw portion 51 protruding outward on the outer peripheral portion as shown in FIGS. Then, as shown in FIG. 5A, when the resin tube 9 moves in the direction of extraction after receiving some external force after being inserted into the connection port 1, it moves in the annular groove 3 following the resin tube 9. The ring body 5 rides on the inclined surface 4 formed by the bottom surface of the annular groove portion 3 so that the claw portion 51 bites into the inner wall surface of the resin tube 9 so that the resin tube 9 is prevented from being removed. It has become.

  In each of the embodiments described above, the ring body 5 for retaining the resin tube 9 is housed inside the resin tube 9 inserted into the connection port portion 1. There is no need to provide a push ring or other member for taking measures against retaining. For this reason, the structure of the connecting portion between the pipe joint and the resin pipe 9 is reduced in size, which helps to perform the construction in a narrow space as seen in the home piping system without difficulty.

  1 to 12, the same or corresponding parts are denoted by the same reference numerals for convenience of explanation.

It is the side view which showed the pipe joint which concerns on embodiment of this invention in the partial cross section. It is the side view which showed the pipe joint by a modification in the partial cross section. (A) is a front view of the annular member employ | adopted as the pipe joint of FIG. 2, (B) is sectional drawing of the part which follows the IIIB-IIIB line | wire of (A). It is the fragmentary sectional view which showed the first step which inserts a resin pipe in a connection port part. It is the fragmentary sectional view which showed the step which finished inserting the resin pipe | tube in a connection port part. It is a fragmentary sectional view in the state where the resin pipe inserted in the connection port part moved to the extraction direction. It is a fragmentary sectional view in the state where the ring body got on an inclined surface. It is the VIII section enlarged view of FIG. (A) is a front view of a ring body as a locking member, and (B) is a partially longitudinal side view of the ring body. (A) is sectional drawing of the principal part of the pipe joint which employ | adopted the ring body by a modification, (B) is a front view of the ring body by a modification, (C) is the partial vertical side view of the ring body by a modification. . (A) is sectional drawing of the principal part of the pipe joint which employ | adopted the ring body by another modification, (B) is a front view of the ring body by another modification, (C) is the ring body by another modification. It is a partial vertical side view. (A) is sectional drawing of the principal part of the pipe joint which employ | adopted the ring body by another modification, (B) is a front view of the ring body by another modification, (C) is by another modification. It is a partial vertical side view of a ring body. It is a partial vertical side view of a prior art example. It is a partial vertical side view of another conventional example. It is a partial vertical side view of other conventional examples. It is a partial vertical side view of other conventional examples. It is a partial vertical side view of other conventional examples. It is a partial vertical side view of other conventional examples. It is a partial vertical side view of other conventional examples.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Connection port part 3 Annular groove part 4 Inclined surface 5 Ring body (locking member)
7 Clamping ring (clamping means)
9 Resin pipe 21 Seal ring 51 Claw

Claims (6)

A pipe joint having a cylindrical connection port portion into which a resin pipe is inserted, and a locking member engageable with the tube wall of the resin tube inserted into the connection port portion,
The locking member is a ring body that is arranged in the annular groove portion of the connection port portion so as to be axially slidable and is elastically pressed against the inner surface of the tube wall of the resin tube that is inserted into the connection port portion. A pipe joint characterized in that an inclined surface for extending the ring body that moves in the direction of pulling out the resin pipe following the above is added to the annular groove. The pipe joint according to claim 1, wherein the inclined surface is formed by a bottom surface of the annular groove portion. The pipe joint according to claim 1, wherein the inclined surface is formed by a surface of an annular member that is divided from the connection port portion and fitted and held in the annular groove portion. The ring body is formed as a tapered claw portion that exerts an action in which a repressing portion with respect to the inner surface of the tube wall of the resin tube is caught in the inner surface of the tube wall and prevents sliding of the resin tube. The pipe joint according to any one of claims 3 to 4. The pipe according to any one of claims 1 to 4, wherein a seal ring is attached to the connection port portion so as to adhere to a tube wall inner surface of the resin pipe inserted into the connection port portion in a watertight state. Fittings. 6. The fastening device according to claim 1, further comprising tightening means for tightening an overlapping portion of the tube wall of the resin pipe inserted into the connection port portion with the ring body in a diameter reducing direction from an outer surface side of the tube wall. The pipe joint described in item 1.

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