JP2014190412A - Union joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the rotation of a union nut with respect to a joint main body even if the union nut is fastened to the resin-made joint main body more than necessary.SOLUTION: This union joint 1 has a resin-made joint main body 2 and a union nut 3 rotatably attached to the joint main body 2 as main parts. Then, a rib 21 is formed at one end of the joint main body 2, a locking part 32 which can be engaged with the rib 21 of the joint main body 2 is formed at the union nut 3, and a guide groove 33 having an inside diameter larger than an outside diameter of the rib 21 and a width narrower than a width of the rib is formed along the locking part 32. By this constitution, even if an external peripheral edge of the rib 21 which is pressed against the locking part 32 is crushed and swollen to the outside by the excessive fastening of the union nut 3, the swollen part can be accommodated in the guide groove 33.

Description

  The present invention relates to a union joint.

  2. Description of the Related Art Conventionally, when connecting pipe bodies, there has been proposed a union joint including a joint main body that can connect one pipe body and a union nut that is rotatably attached to the joint main body (for example, Patent Document 1). reference). This union joint can be connected to the other pipe body without rotating one pipe body connected to the joint body side of the union joint by rotating the union nut. It is suitably used for connecting small diameter pipes for supplying water and the like.

Japanese Patent Laid-Open No. 20005-11001

  By the way, as described above, the union joint is used when connecting a small-diameter pipe that supplies a low-pressure fluid, and does not require a particularly large strength. However, the joint body and the union nut are made of a metal material having a relatively high strength, for example, a copper alloy such as gun metal, and there is a problem that the cost is increased. For this reason, since a low-pressure fluid is circulated, an attempt has been made to reduce the cost by using a joint body that does not require high strength as a resin.

  In this case, when the metal union nut constituting the union joint is screwed to the male thread of the other pipe body to be connected, one end face of the joint body is abutted against one end face of the other pipe body, and the union joint is used. It is necessary to ensure the water tightness of the connection part. That is, when the union nut is rotated with respect to the joint body and screwed to the male thread of the other pipe body, the engaging part of the union nut engages with the rib of the joint body and pulls the joint body, and the other pipe body Since the one end face of the joint body is abutted against the one end face of the joint body and sealed, when the union nut is tightened more than necessary, the engaging portion presses the rib of the joint body with a large force. As a result, the engaging part of the union nut crushes the outer peripheral edge part of the rib of the resin joint body abutted against the distal end surface of the other tube body, and the end edge part bulges outward. In some cases, the union nut may be crimped to the corner portion formed by the engaging portion and the inner peripheral surface. As a result, there is a problem that the union nut and the joint body are integrated, it is difficult to rotate the union nut with respect to the joint body, and it cannot be detached from the other tube body.

  The present invention has been made in view of such problems, and even when a union nut having a strength equal to or higher than that of a joint body is tightened more than necessary with respect to a resin joint body, the joint body The union joint which can ensure rotation of the union nut with respect to is provided.

  The present invention is a union joint mainly comprising a resin-made joint body and a union nut rotatably mounted on the joint body, wherein a rib is formed at one end of the joint body, and the union nut And a guide groove having an inner diameter larger than the outer diameter of the rib and a width smaller than the outer diameter of the rib. It is what.

  According to the present invention, when a female screw of a union nut is screwed into a male screw of a pipe body to be connected and connected, the union nut is in a state in which the one end face of the joint body rib side and the one end face of the pipe body to be connected are abutted. By tightening the nut more than necessary, the engaging part of the union nut presses the rib of the joint body with a large force to crush the rib, and the crushed end edge bulges outward along the engaging part. Even if it makes it, the bulging part is accommodated in the guide groove formed along the latching | locking part of a union nut, and it can prevent being crimped | bonded to the internal peripheral surface of a union nut.

  As a result, even if the union nut is tightened more than necessary, the rib of the resin joint body is crushed, and even if the crushed end edge bulges outward, the rotation of the union nut relative to the joint body is ensured. The union joint can be reliably detached from the pipe body to be connected.

  According to the present invention, even when a union nut having a strength equal to or higher than that of the joint body is tightened more than necessary with respect to the resin joint body, the rotation of the union nut relative to the joint body can be ensured. .

It is sectional drawing which shows one Embodiment of the union joint of this invention. It is sectional drawing of the union nut of the union coupling of FIG. It is the A section enlarged view of FIG.

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

  FIG. 1 shows an embodiment of a union joint 1 of the present invention.

  The union joint 1 is mainly composed of a resin joint body 2 and a metal union nut 3 that is rotatably mounted on the joint body 2 and is not shown in detail. It is used when a water supply pipe such as a cross-linked polyethylene pipe laid in a building is used as one pipe, and the connection port of the water heater is used as the other pipe to connect them.

  The joint body 2 is formed with a rib 21 having a set width projecting outward at one end portion, and a seal groove 2a is formed from the other end portion of the substantially intermediate portion, and a seal groove 2a is provided with a seal. The member 22 is arrange | positioned and the inner peripheral surface of a water supply pipe | tube can be sealed. Moreover, the sheet packing 23 is arrange | positioned at the rib 21 side one end surface of the coupling main body 2, and it can seal between the connection port end surfaces of a water heater.

  The union nut 3 is formed with a female thread 31 (parallel pipe thread) corresponding to the male thread formed at the connection port of the water heater, and the rib of the joint body 2 when the joint body 2 is fitted into the union nut 3. A locking portion 32 that can be engaged with 21 is formed. And when the coupling main body 2 is inserted by the union nut 3, the internal diameter of the latching | locking part 32 is set so that it can rotate with respect to the outer peripheral surface which follows the rib 21 in the coupling main body 2. FIG. Further, a guide groove 33 having an inner diameter smaller than the rib 21 of the joint body 2 and having an inner diameter larger than the outer diameter of the rib 21 is formed on the inner peripheral surface along the engaging portion 32 of the union nut 3. When the outer peripheral edge of the rib 21 pressed against the engaging portion 32 of the union nut 3 is crushed and bulges outward along the engaging portion 32, the bulged portion can be accommodated. Depth (inner diameter) and width are set.

  In the embodiment of the union joint 1, the outer cylinder member 4 that is integrally attached to the outer peripheral surface of the joint body 2, the cap 5 that is integrally attached to the outer cylinder member 4, the outer cylinder member 4, and The water supply pipe is formed by a retaining ring 6 disposed between the caps 5 and an insertion guide 7 fitted and inserted into the joint body 2 so as to prevent the seal member 22 disposed on the joint body 2 from being detached. It is formed in the one-touch coupling which can be connected by inserting.

  Next, the construction point which connects the connection port of a water supply pipe and a water heater using the union joint 1 comprised in this way is demonstrated.

  First, the union joint 1 is connected to a connection port (not shown) of the water heater. Specifically, the female thread 31 of the union nut 3 of the union joint 1 is screwed into the male thread formed at the connection port of the water heater and tightened. Thereby, the latching | locking part 32 of the union nut 3 engages with the rib 21 of the coupling main body 2, and draws it so that the rib 21 side one end surface may contact | abut to the connection port end surface of a water heater. And the rib 21 side one end surface of the joint main body 2 of the union joint 1 and the connection port end surface of the water heater are abutted and brought into surface contact, and the abutting surface is formed by the sheet packing 23 provided on the rib 21 side one end surface. Sealed.

  On the other hand, if the union joint 1 is connected to the water heater, a water supply pipe is connected to the union joint 1. Specifically, the distal end portion of the water supply pipe is inserted into a space formed between the outer peripheral surface of the joint body 2 of the union joint 1 and the inner peripheral surface of the outer cylinder member 4 and the inner peripheral surface of the cap 5. Thereby, the inner peripheral surface of the tip of the water supply pipe rides on the outer peripheral surface of the retaining ring 6 and abuts against the flange portion. When the water supply pipe is further inserted, the water supply pipe is inserted together with the insertion guide 7 in a state where the tip end surface thereof abuts against the flange portion of the insertion guide 7. At this time, the outer peripheral surface side of the seal member 22 is covered with the insertion guide 7, and the tip of the seal member 22 comes into contact with the seal member 22 when the water supply pipe is inserted, and the seal member 22 is detached from the seal groove 2 a to be damaged. Can be prevented. If the water supply pipe is inserted to the stroke end, the connection work of the water supply pipe is completed, and the water heater and the water supply pipe can be connected via the union joint 1.

  Even if a force in the pull-out direction is applied to the water supply pipe, the inner peripheral edge of the retaining ring 6 is deformed so as to reduce the inner diameter and bites into the outer peripheral surface of the water supply pipe, thereby reliably preventing the water supply pipe from coming out. can do.

  Further, if the union nut 3 of the union joint 1 is rotated so as to loosen, the union joint 1 can be detached from the water heater, and maintenance and inspection of the water heater can be performed. At this time, the union nut 3 can be rotated with respect to the joint body 2 integrally connecting the water supply pipes, and the water supply pipes are not rotated.

  By the way, when the union joint 1 is connected to the water heater, the union nut 3 is temporarily connected even though the rib 21 side end surface of the joint body 2 and the connection port end surface of the water heater are necessary and sufficiently abutted. In addition, when tightened, the engaging portion 32 of the union nut 3 presses the rib 21 of the joint body 2 with a large force in a state where the connection port end face of the water heater and the end face on the rib 21 side of the joint body 2 are abutted. Will do. Thereby, the outer peripheral edge part in the rib 21 of the joint main body 2 is crushed, and the crushed edge part bulges outward along the locking part 32 of the union nut 3. In this case, since the guide groove 33 is formed along the locking portion 32 of the union nut 3, the bulging portion of the rib 21 is accommodated in the guide groove 33 along the locking portion 32 of the union nut 3. It is not crimped to the inner peripheral surface of the union nut 3. Therefore, the union nut 3 can be reliably rotated with respect to the joint body 2, and can be detached from the connection port of the water heater as required.

  In addition, in embodiment mentioned above, although the metal union nut was illustrated, also when the union nut which has the intensity | strength equal to or more than the resin-made joint main body is tightened more than necessary, in the rib 21 of the joint main body 2 There is a risk of crushing the outer edge. For this reason, as a union nut, it is not limited to a metal, For example, the nut which coat | covered resin to the metal internal thread part, resin (PPSU; polyphenylsulfone, PPS; polyphenylene sulfide, PES; polyethersulfone, nylon, POM (polyacetal, polycarbonate) can be applied to nuts made of glass fibers impregnated to improve strength, and nuts made of a resin (PPSU, PES, etc.) having a strength equal to or higher than that of the joint body.

  Moreover, in embodiment mentioned above, although illustrated about the case where the connection port of a water supply pipe and a water heater is connected, it is not limited to such an example, It can employ | adopt when connecting pipe bodies.

DESCRIPTION OF SYMBOLS 1 Union coupling 2 Joint main body 21 Rib 3 Union nut 32 Locking part 33 Guide groove

Claims (1)

  A union joint whose main part is a resin-made joint body and a union nut rotatably mounted on the joint body, wherein a rib is formed at one end of the joint body, and A union joint, characterized in that a locking portion engageable with the rib is formed, and a guide groove having an inner diameter larger than the outer diameter of the rib and smaller than the width is formed along the locking portion. .

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