JP2008157437A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly reliable pipe joint which maintains a strength despite a synthetic resin material and has no possibility to leak the water. <P>SOLUTION: The pipe joint A has the joint body 1 of synthetic resin which the cylindrical body 6 connected to a pipe B is formed, the sleeve 10 of synthetic resin which is coupled with this joint body 1 and a male thread part 12 is formed on the outer circumferential face and the nuts 20 of synthetic resin or metal which forms a female thread part 21 to be screwed with the male thread part 12 of the sleeve 10 to the internal face and intervenes a retaining ring 30 to bite into the outer circumferential face of the pipe B, which the joint body 1 and the sleeve 10 are made to be the different article. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pipe joint to which pipes for water supply and hot water supply are connected.

Conventionally, pipes for water supply and hot water supply can be externally fitted and connected to the cylindrical part, and the pipes can be easily connected to the pipe joints so that they cannot be easily removed. There exists a thing of patent document 1 in a well-known thing.

The pipe joint of Patent Document 1 includes a joint main body in which a cylindrical portion into which a pipe is fitted is formed, a retaining ring in which a biting groove facing the outer peripheral surface of the cylindrical portion is formed, and the retaining ring is interposed. Nuts. A slot is formed in the outer peripheral surface of the cylindrical portion. A seal member is attached to the slot, and a nut is screwed onto a male screw portion formed in the joint body, and then the pipe is placed between the cylindrical portion and the nut. When the pipe is inserted into the cylindrical portion and fitted into the cylindrical portion, the inner peripheral surface side of the pipe is sealed in a water-tight manner by the seal member, and the biting groove of the retaining ring bites into the outer peripheral surface side and is sandwiched between the cylindrical portion and the retaining ring. And connected to the joint body.

JP 2005-163974 A

By the way, the joint body of a pipe joint is usually made of metal, but if it is made of metal, the cost increases and the weight becomes heavy, and it is necessary to work while supporting the heavy pipe joint during construction. This is a heavy burden on the worker. Therefore, in recent years, synthetic resin instead of metal has been commercialized for the purpose of reducing the cost and weight of the joint body of the pipe joint. Accordingly, when the joint body of the pipe joint of Patent Document 1 is made into a synthetic resin, the male thread portion integrally formed on the outer peripheral surface of the joint body is also made of synthetic resin. In this case, as shown in FIG. 11, at the tip of the male screw of the joint body, it is desirable to perform the lightening X because the outer peripheral surface adjacent to the male screw part is unnecessary. Can be made smaller and more compact and lighter. However, since the boundary line part between the male thread part and the tip part is thin, the strength of the joint body is insufficient, and there is a risk that the boundary line part will be deformed and water leakage will occur when the pipe is connected. I had a problem that there was.

  The present invention has been made paying attention to such problems existing in the prior art, and the problem is to maintain strength while the material is made of synthetic resin, and there is no risk of water leakage. It is to provide a highly flexible pipe joint.

  In order to achieve the above object, a pipe joint according to the first aspect of the present invention includes a synthetic resin joint body formed with a cylindrical portion to which a pipe is connected, and a male thread portion on the outer peripheral surface coupled to the joint body. The formed synthetic resin sleeve, and the inner peripheral surface is formed with a female screw portion that is screwed into the male screw portion of the sleeve, and is made of synthetic resin or metal with a retaining ring that bites into the outer peripheral surface of the pipe. The joint body and the sleeve are separate articles.

  According to a second aspect of the present invention, in the pipe joint according to the first aspect of the invention, an annular groove is formed on the outer peripheral surface of the joint body, an annular protrusion is formed on the inner peripheral surface of the sleeve, and the annular protrusion is formed into the annular groove. The sleeve is connected to the joint body by fitting.

According to a third aspect of the present invention, in the pipe joint according to the first or second aspect of the present invention, the sleeve is provided with holding means that does not rotate when the nut is screwed and rotates together with the nut when operated in the direction of loosening the nut. Is.

According to a fourth aspect of the present invention, in the pipe joint according to the third aspect of the invention, the holding means includes a locking projection formed on the outer peripheral surface of the joint main body, and a groove portion formed on the inner peripheral surface of the sleeve and on which the locking projection moves. The stopper is formed at one end of the groove portion and engages with the locking projection. When the stopper engages with the locking projection, the sleeve does not rotate, and the nut is screwed onto the sleeve to loosen the nut. When operated in the direction, the nut and the sleeve rotate together.

According to a fifth aspect of the present invention, there is provided a pipe joint comprising a synthetic resin joint body having a cylindrical portion to which a pipe is connected, and a metal sleeve coupled to the joint body and having a male thread portion formed on an outer peripheral surface thereof. A female screw part that is screwed into the male screw part of the sleeve on the inner peripheral surface, and a synthetic resin or metal nut with a retaining ring that bites into the outer peripheral surface of the pipe. The main body and the sleeve are separate articles.

  The pipe joint of claim 1 of the present invention is made of a synthetic resin joint body in which a cylindrical portion to which a pipe is fitted is formed, and a synthetic resin made of a synthetic resin having a male screw portion formed on the outer peripheral surface thereof. As a separate product from the sleeve, the internal thread portion of the nut with the retaining ring interposed is screwed to the external thread portion of the sleeve, so that the conventional external thread portion is integrally formed with a synthetic resin pipe joint and In comparison, it is possible to provide a pipe joint that can be made small in diameter without performing the hollowing out of the joint body, can be made compact, has strength, and does not cause water leakage.

  In the pipe joint according to the second aspect, the sleeve can be easily coupled to the joint body by utilizing the elastic force of the sleeve made of synthetic resin without using an adhesive.

  According to the pipe joints of the third and fourth aspects, when the nut is operated in the loosening direction, the nut and the sleeve rotate together in a screwed state, so that the nut is removed from the joint body while the pipe is connected. Therefore, the articles of the pipe joint are not inadvertently disassembled, and separation of the nut from the sleeve can be prevented without using an adhesive for fixing the nut to the sleeve.

  According to the pipe joint of claim 5, it is possible to make the diameter smaller without reducing the inner diameter of the joint body as compared with the synthetic resin pipe joint in which the male thread portion is integrally formed. In addition, a sleeve having a male threaded portion formed on the outer peripheral surface is made of metal and thus has a strength and can provide a pipe joint that does not cause water leakage.

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

  As shown in FIGS. 1 to 3, the pipe joint A of the present invention includes a joint body 1 to which a synthetic resin pipe B is connected, a sleeve 10 coupled to the outer peripheral surface of the joint body 1, and the sleeve 10. A nut 20 that is screwed to and connected to the pipe, a retaining ring 30 that is interposed in the nut 20 and bites into the outer peripheral surface of the pipe B, and is attached to the joint body 1 to connect the pipe B to the joint body 1 in a watertight manner. The joint body 1 and the pipe B are provided so that the pipe B is prevented from coming off from the joint body 1 by the retaining ring 30 and is connected in a watertight manner by the sealing member 40.

  The joint body 1 has a substantially cylindrical shape and is made of a synthetic resin. The water passage 2 through which water or hot water (hereinafter referred to as water in this embodiment) passes in the direction of the internal axis. Is formed through. A tool locking part 3 having an outer peripheral surface of, for example, a hexagonal shape is formed at the approximate center of the joint body 1 so that a tightening tool such as a spanner is locked, and is connected to the outer periphery on one end side of the tool locking part 3. A part 4 is formed, and a threaded part 5 for connecting to another instrument is formed on the outer peripheral surface of the connecting part 4. A cylindrical portion 6 to which the pipe B is externally fitted and connected is formed on the outer periphery of the other end of the tool locking portion 3 of the joint body 1. The cylindrical portion 6 is connected to the sleeve 10. An annular groove 7 and locking protrusions 8 and 8a are formed. As shown in FIG. 5, the locking protrusions 8 and 8a are composed of a first locking protrusion 8 and a second locking protrusion 8a formed at opposing positions 180 degrees apart on the outer peripheral surface of the cylindrical portion 6. Due to the stop projections 8 and 8 a, the sleeve 10 coupled to the cylindrical portion 6 does not rotate when the nut 20 is screwed, and when the nut 20 is operated in the loosening direction, the rotation range is set so as to rotate together with the nut 20. Can be regulated. In addition, although the shape of the joint main body of a present Example is straight shape, other shapes, such as not only a straight shape but elbow, cheese, a socket, may be sufficient.

  The sleeve 10 is made of synthetic resin, and an annular protrusion 13 formed on the inner peripheral surface thereof is elastically coupled to the annular groove 7 of the joint body 1. As shown in FIGS. 3 to 5, the sleeve 10 has a substantially C shape having one cut 11 in a part in the circumferential direction, and a male screw portion 12 is formed on the outer peripheral surface thereof. A holding means 14 is provided on the inner peripheral surface of the sleeve 10 on one opening hole side. The holding means 14 includes a locking projection 8, 8 a formed on the cylindrical portion 6 of the joint body 1, and a groove portion 15 formed in an annular shape on the inner peripheral side of the opening hole of the sleeve 10 and to which the locking projection 8, 8 a moves. A stopper 16 is formed on a part of the groove 15 to prevent the rotation of the nut 20 by engaging the locking projections 8 and 8a. When the nut 20 is screwed to the sleeve 10, the sleeve 10 is a nut. When the nut 20 is operated so as not to rotate with the nut 20 and further loosened with respect to the sleeve 10, the sleeve 10 can rotate together with the nut 20 in the same direction.

  As shown in FIGS. 1 to 3, the nut 20 is coupled to the male screw portion 12 of the sleeve 10. The nut 20 is coupled to the joint body 1 via the sleeve 10 by screwing a female screw portion 21 formed on the inner peripheral surface of the base end to a male screw portion 12 formed on the outer peripheral surface of the sleeve 10. It is. An annular insertion groove 22 into which the pipe B is inserted is formed between the outer peripheral surface of the joint body 1 and the inner peripheral surface of the nut 20.

  A retaining ring 30 is interposed by a fixing member 23 at the front end opening 20a of the nut 20, and a number of saw-shaped protrusions projecting toward the inner back of the nut 20 on the inner periphery of the retaining ring 30. Teeth 31 are formed. The saw-tooth 31 allows the pipe B to be inserted into the insertion groove 22, but when the pipe B inserted into the insertion groove 22 is pulled out, the saw-tooth 31 is formed on the outer peripheral surface of the pipe B. The pipe B is prevented from being pulled out. The pipe B is formed of a soft synthetic resin material (polyethylene or polypropylene pipe) in which the serrated teeth 31 of the retaining ring 30 are easy to bite.

  A plurality of annular mounting grooves 9 are formed in the outer peripheral surface of the cylindrical portion 6 in the joint body 1, and a seal member 40 is fitted in each mounting groove 9. The seal member 40 seals the inner peripheral surface of the pipe B and the cylindrical portion 6 of the joint body 1 so that water flowing through the water passage 2 of the joint body 1 does not leak to the outside.

A slide cylinder 50 that is movable along the axial direction is fitted into the cylindrical portion 6 of the joint body 1. The slide cylinder 50 is disposed outside the seal member 40 before the pipe B is inserted into the insertion groove 22.

In the case of the pipe joint A having such a configuration, when the sleeve 10 is coupled to the joint body 1, the locking projections 8 and 8a of the joint body 1 are positioned in the groove portion 15 of the sleeve 10 as shown in FIG. It becomes. In this state, when the female threaded portion 21 of the nut 20 is operated in a direction to be screwed onto the male threaded portion 12 of the sleeve 10, the stopper 16 of the sleeve 10 is engaged with the one locking projection 8 of the joint body 1. Does not further rotate in the left rotation direction, which is the direction in which the nut 20 is screwed, and the female screw portion 21 of the nut 20 can be firmly screwed to the male screw portion 12 of the sleeve 10.

Further, when the nut 20 is operated in the loosening direction to be removed from the sleeve 10, as shown in FIGS. 6 and 7, the nut 20 and the sleeve 10 are separated from each other by the holding means 14 with the female screw portion 21 and the male screw portion 12. The nut 20 cannot be detached from the sleeve 10 and the joint body 1 by rotating together in a screwed state.

  The nut 20 has a confirmation window 24 for confirming the insertion state of the pipe B. Further, a synthetic resin opening / closing cover 25 for opening / closing the confirmation window 24 is provided on the outer peripheral surface of the nut 20. A coil spring 26 is accommodated in the insertion groove 22 as an elastic member that biases the opening / closing cover 25 in the direction in which the confirmation window 24 is closed. Therefore, when the pipe B is inserted into the insertion groove 22 by a predetermined amount, the opening / closing cover 25 moves in a direction to open the confirmation window 24 against the elastic force of the coil spring 26.

  In the present invention, in order to connect the pipe B to the pipe joint A, the tip of the pipe B is inserted from the opening 20a of the nut 20 as shown in FIGS. Then, the inner peripheral surface of the pipe B slides while pressing the slide cylinder 50 and the entire outer peripheral surface of the seal member 40. When the pipe B is inserted deeper in this state, the opening / closing cover 25 moves in a direction to open the confirmation window 24 against the elastic force of the coil spring 26. When the pipe B reaches the insertion position, the confirmation window 24 is completely opened as the opening / closing cover 25 moves. Thereby, it is possible to confirm the insertion position of the pipe B by visually observing whether the tip end portion of the pipe B is disposed at the insertion position directly through the confirmation window 24.

  Here, when the nut 20 coupled to the sleeve 10 is rotated in the loosening direction, the sleeve 10 and the nut 20 are coupled by the holding means 14 as shown in FIG. Between FIG. 7 engaged with the second locking projection 8a of the joint body 1, the sleeve 10 rotates in the same direction with the male screw part 12 and the female screw part 21 screwed together with the nut 20, 20 remains connected to the sleeve 10 and the joint body 1. Accordingly, the nut 20 cannot be inadvertently separated from the joint body 1, and there is no fear that the articles constituting the pipe joint A will be lost by inadvertently separating the nut 20 from the joint body 1.

As described above, according to the pipe joint of the present invention, a synthetic resin joint body in which a cylindrical portion on which a pipe is fitted is formed, and a synthetic resin body that is coupled to the joint body and has a male thread portion on the outer peripheral surface. Since the female threaded portion of the nut with the retaining ring interposed is screwed to the male threaded portion of the sleeve, the conventional male threaded portion is formed integrally with the sleeve. Compared to the above, it is possible to provide a pipe joint that can be reduced in diameter without performing the lightening of the joint body, can be made compact, has strength, and does not cause water leakage.

  Next, the pipe joint C according to the second embodiment will be described with reference to FIGS. The pipe joint C of the second embodiment is different from the first embodiment in that the shape of the sleeve mounting portion formed in the joint main body, the material and shape of the sleeve are changed, and a rotation stopper is newly added. . In addition, in the pipe joint C of Example 2, the same code | symbol is attached | subjected about the goods of the same structure as Example 1, and detailed description is abbreviate | omitted.

  In the pipe joint C of the second embodiment, the joint body 1a has a substantially cylindrical shape, and the material thereof is made of a synthetic resin. A water passage 2a through which water passes is formed in the inner axial direction. . A tool locking part 3a having an outer peripheral surface of, for example, a hexagonal shape is formed so that a tightening tool such as a spanner is locked at substantially the center of the joint body 1a, and is connected to the outer periphery on one end side of the tool locking part 3a. A portion 4a is formed, and a threaded portion 5a for connecting to another instrument is formed on the outer peripheral surface of the connecting portion 4a. Further, a cylindrical portion 6a to which the pipe B is externally fitted and connected is formed on the outer periphery on the other end side of the coupling portion 4a of the joint body 1a, and the outer periphery between the cylindrical portion 6a and the tool locking portion 3a. An annular groove 80 for mounting a rotation stopper 61 described later is formed on the surface. Further, between the annular groove 80 and the tool locking portion 3a, a pair of protrusions 81, 81 for connecting a sleeve 10a described later is formed facing each other.

  The sleeve 10a is substantially ring-shaped and made of metal, and an external thread 12a is formed on the outer peripheral surface. As shown in FIG. 10, a pair of fitting portions 70, 70 formed in a substantially arc shape are formed on the bottom surface of the sleeve 10a so as to face each other. Protrusions 71 and 71 projecting inward toward the axial center are formed on the inner peripheral surfaces of the fitting parts 70 and 70, and a notch 72 is formed in an annular direction between the projecting parts 71 and 71. , 72 are formed. Each protrusion 71, 71 has a flat surface 73, 73 formed on the bottom surface thereof, and a contact portion 74, 74 formed on the side surface.

The rotation stopper 61 is made of a synthetic resin and is formed in a substantially ring shape. The rotation stopper 61 includes an annular portion 62 and a pair of protrusions 63 and 63 extending in the axial direction from a part of the annular portion 62, and the protrusions 63 and 63 face each other. It is formed together. Claws 64, 64 are formed at the upper ends of the protrusions 63, 63, respectively, and the claw 64 is formed inward from the protrusion 63 toward the axial center of the rotation stopper 61.

In such a pipe joint C, in order to couple the sleeve 10a having the external thread portion 12a formed on the outer peripheral surface to the joint body 1a, the notches 72, 72 of the sleeve 10a and the projections 81 of the joint body 1a, 81 is set to face each other so that the flat surface portion 73 of the sleeve 10a and the flat surface portion 84 of the joint body 1a are in contact with each other. Then, the sleeve 10a is rotated to the right when viewed from the tip of the joint body 1a, and the contact portion 74 is rotated to a state where it comes into contact with the stoppers 82, 82 formed at the lower portions of the projections 81, 81 of the joint body 1a.

Next, the protrusions 63 and 63 of the rotation stopper 61 are inserted between the notches 83 and 83 of the joint body 1b and the sleeve 10a, and the claws 64 and 64 are elastically fitted into the groove 80 of the joint body 1b.

The rotation stopper 61 is configured not to be detached from the joint body 1a when the claws 64, 64 are fitted in the groove 80 of the joint body 1b. When the rotation stopper 61 is fitted in the joint body 1a, the contact portion 74 of the sleeve 10a and the protrusion 63 of the rotation stopper 61 come into contact with each other, and the sleeve 10a cannot be rotated. It is designed not to come off.

In the first embodiment, the sleeve is coupled to the joint main body by the holding means. However, in the second embodiment, the holding means is not provided, and the rotation stopper need only be elastically coupled to the joint main body. Thus, in the second embodiment, the sleeve can be easily coupled to the joint body as compared with the first embodiment.
Further, since the sleeve having the external thread portion formed on the outer peripheral surface is made of metal, the strength of the pipe joint can be improved.

As described above, according to the pipe joint of the second embodiment, a synthetic resin joint body in which a cylindrical part to which a pipe is fitted is formed, and a metal part that is coupled to the joint body and has a male screw part formed on the outer peripheral surface. Since the female threaded portion of the nut with the retaining ring interposed is screwed to the male threaded portion of the sleeve, the conventional male threaded portion is formed integrally with the sleeve. Compared to the above, it is possible to reduce the diameter of the joint body without reducing the thickness of the joint body, and it is possible to reduce the size of the joint body. Therefore, it is possible to provide a pipe joint that does not cause the occurrence of the problem.

In the pipe joint of Example 1, it is a longitudinal cross-sectional view of the state before connecting a pipe. In the pipe joint of Example 1, it is the longitudinal cross-sectional view of the state which connected the pipe. It is a disassembled perspective view of the pipe joint of Example 1. FIG. 3 is a plan view of a sleeve of Example 1. FIG. It is explanatory drawing of the holding means by a sleeve and a coupling main body in the case of operating a nut in a fastening direction. It is explanatory drawing of the holding means by a sleeve and a coupling main body at the time of operating in the direction which loosens a nut. It is explanatory drawing of the holding means by a sleeve and a coupling main body at the time of operating in the direction which loosens a nut. In the pipe joint of Example 2, it is a longitudinal cross-sectional view of the state before connecting a pipe. It is a disassembled perspective view of the pipe joint of Example 2. 6 is a perspective view of a sleeve according to Embodiment 2. FIG. It is explanatory drawing of a prior art.

Explanation of symbols

1, 1a: Joint body 6, 6a: Cylindrical part 7: Annular groove 8, 8a: Second locking projection 10, 10a: Sleeve 12, 12a: Male thread part 13: Annular protrusion 14: Holding means 15: Groove part 16: Stopper 20: Nut 21: Female thread part 30: Retaining ring A: Pipe joint C: Pipe joint

Claims (5)

  A synthetic resin joint body having a cylindrical portion to which a pipe is connected, a synthetic resin sleeve coupled to the joint body and having an external thread formed on the outer peripheral surface, and an external thread portion of the sleeve on the inner peripheral surface A female screw part to be screwed to the pipe, and a nut made of synthetic resin or metal interposing a retaining ring that bites into the outer peripheral surface of the pipe, wherein the joint body and the sleeve are separate articles. Characteristic pipe joint.   An annular groove is formed on the outer peripheral surface of the joint body, an annular protrusion is formed on the inner peripheral surface of the sleeve, and the sleeve is coupled to the joint body by fitting the annular protrusion into the annular groove. The pipe joint according to claim 1.   The pipe joint according to claim 1 or 2, further comprising a holding means that does not rotate when the nut is screwed and rotates together with the nut when the nut is operated in a loosening direction.   The holding means includes a locking projection formed on the outer peripheral surface of the joint body, a groove portion formed on the inner peripheral surface of the sleeve, and a stopper formed on one end of the groove portion and engaged with the locking projection. When the stopper engages with the locking projection, the sleeve does not rotate, and when the nut is screwed onto the sleeve and operated in the direction of loosening the nut, the nut and the sleeve are screwed together. The pipe joint according to claim 3, wherein the pipe joint rotates.   A synthetic resin joint body formed with a cylindrical portion to which a pipe is connected, a metal sleeve coupled to the joint body and having a male thread portion formed on the outer peripheral surface, and an inner peripheral surface connected to the male thread portion of the sleeve. A female screw part to be screwed is formed, and a nut made of synthetic resin or metal interposing a retaining ring that bites into the outer peripheral surface of the pipe is provided, and the joint body and the sleeve are separate articles. Pipe fittings.

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