JP2006342947A - Resin pipe connection joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin pipe connection joint for securing the flow amount of fluid matching to the inner diameter of a resin pipe while giving a come-off preventing effect to the resin pipe. <P>SOLUTION: The resin pipe connection joint has an engaging tooth portion formed on a connection cylinder portion into which the resin pipe 100 is inserted, with cutting work for engaging with the inner periphery of the resin pipe 100 to prevent the come-off of the resin pipe 100. The connection cylinder portion 10 is formed with a thin pipe, and the engaging tooth portion 20 is separated from the connection cylinder portion 10 and held to be fitted to an annular recessed portion 11 formed in the pipe wall of the thin pipe. The inner diameter of the annular recessed portion 11 is made larger than the inner diameter of the connection cylinder portion formed by cutting the engaging tooth portion 20 so as to approximate the inner diameter of the resin pipe 100. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention secures a fluid flow rate corresponding to the inner diameter of a resin pipe while being able to exert a watertight connection action in combination with a resin pipe connection joint, in particular, a resin pipe hold-out action and its hold-out action. The present invention relates to a resin pipe joint.

  Conventional resin pipe connection joints are known in which a connection tube portion into which a resin tube is inserted is provided with an engagement tooth portion having a sawtooth cross section. In this case, a resin tube inserted into the connection tube portion is known. By engaging the engaging tooth part with the inner peripheral part of the resin pipe, the resin tube is prevented from being pulled out or water leakage is prevented (for example, see Patent Document 1).

  FIG. 14 illustrates a resin pipe connection joint 1 having the above-described configuration in which an engagement tooth portion 3 having a sawtooth cross section is formed on the connection tube portion 2 by cutting. In this resin pipe connection joint 1, it is necessary to cut out the engagement tooth portion 3 having a sawtooth cross section provided with a valley portion and a mountain portion on the outer periphery of the connection tube portion 2, and in particular, the valley shape of the connection tube portion 2. Since the strength is required to be sufficiently large even at the portion, the overall outer diameter (outer diameter of the chevron) is larger than the inner diameter of the connecting tube portion 2. Therefore, in a state where the resin tube 100 is inserted into the connection tube portion 2 in a press-fitted state and the resin tube 100 is connected to the connection tube portion 2, the connection tube portion 2 has a size corresponding to the size of the inner diameter D1 of the resin tube 100. The inner diameter D2 was small.

JP 2003-222282 A

  However, in a pipe employing the resin pipe connection joint 1 shown in FIG. 14, for example, a hot water supply pipe or a water supply pipe in a house, the allowable flow rate flowing through the pipe line mainly depends on the inner diameter D2 of the connection cylinder portion 2. In addition, it is uneconomical to use a resin tube 100 having an inner diameter D1 larger than necessary.

  The present invention has been made in view of the above situation, and the fluid flow rate corresponding to the inner diameter of the resin pipe while being able to exert the watertight connection action together with the retaining action of the resin pipe and the retaining action. An object of the present invention is to provide a resin pipe connection joint capable of ensuring the above.

  Another object of the present invention is to provide a resin pipe connection joint that makes it possible to use a resin pipe thinner than that in the case of FIG. 14 when a flow rate equivalent to that in FIG. 14 is secured.

  Another object of the present invention is to provide a resin pipe connection joint capable of exhibiting a retaining action and a watertight connecting action equivalent to or exceeding those in the case of FIG.

  In the resin pipe connection joint according to the present invention, an engagement tooth portion that engages with the inner peripheral portion of the resin pipe and prevents the resin pipe from being removed is formed by cutting in the connection cylinder portion into which the resin pipe is inserted. In the resin pipe connecting joint, instead of forming the engaging tooth portion in the connecting tube portion by cutting, the connecting tube portion is formed of a thin tube, and the engaging tooth portion is formed from the connecting tube portion. Separated and held in an annular recess formed on the tube wall of the thin-walled tube, the inner diameter of the annular recess is made larger than the inner diameter of the connecting tube portion formed by cutting the engaging tooth portion. It is expanded and approximated to the inner diameter of the resin tube.

  According to the present invention, the fluid flow rate secured by the connecting tube portion is determined by the inner diameter of the annular recess of the thin tube, and the inner diameter of the annular recess approximates the inner diameter of the resin tube. Even if it depends mainly on the inner diameter of the annular recess, the flow rate approximates the flow rate allowed by the resin pipe. Therefore, a flow rate corresponding to the inner diameter of the resin pipe is secured, and it is not necessary to use a resin pipe having a larger inner diameter than necessary as in the case of FIG. In other words, compared to the case of FIG. 14, it is possible to increase the flow rate by using a thin resin tube.

  The present invention relates to a resin pipe connection joint in which a connection tube portion into which a resin tube is inserted includes an engagement tooth portion that engages with an inner peripheral portion of the resin tube and prevents the resin tube from being removed. The connecting tube portion is formed of a thin tube, and the engaging tooth portion is separated from the connecting tube portion and is held in a fitting manner in an annular recess formed in the tube wall of the thin tube. This also makes it possible to increase the flow rate by using a thin resin tube as compared with the case of FIG.

  In the present invention, the outer peripheral surface of the tip side portion of the connection tube portion is formed as a cylindrical surface that is in watertight contact with the inner peripheral surface of the soft resin tube fitted to the connection tube portion. It is possible to adopt a configuration that is formed, and according to this, in a resin pipe connection joint for which a soft resin pipe is used, it is possible to connect at a connection place without using a seal ring such as a rubber ring. There is an advantage that watertight connectivity is ensured.

  In the present invention, an annular groove portion that holds a seal ring that is water-tightly attached to the inner peripheral surface of the resin tube fitted to the connection tube portion at a tip side portion of the connection tube portion relative to the formation portion of the annular recess. According to this, the seal ring is in close contact with the inner peripheral surface of the resin tube and exhibits watertight connectivity, so whether the resin tube is a soft tube. Regardless of whether it is a hard tube, watertight connectivity is ensured.

  In the present invention, it is desirable that a protruding portion that restricts the fitting allowance of the resin pipe by the end of the resin pipe fitted to the connection cylinder portion abutting on the connection cylinder portion is preferably formed. According to this, the fitting allowance of the resin pipe is fixed.

  In the present invention, it is desirable that the raised portion is formed by a chevron-shaped annular portion at the end of a bendable corrugated region formed in the connecting tube portion. According to this, since the direction of the connecting tube portion can be changed by bending the corrugated region, not only is it easy to cope with the bending of the pipe, but there is also an advantage that it is not necessary to separately form a raised portion. .

  In the present invention, various measures can be taken to prevent the resin tube from being removed. For example, the engagement tooth portion is formed by a retaining member having an annular engagement tooth that is sawtooth-shaped and continuous at a plurality of axial positions on the outer peripheral surface by removing one circumferential portion and deforming the expansion and contraction diameter. It may be formed. In addition, the engaging tooth portion is formed in an inclined engaging claw that is deformable to expand and contract in diameter by removing one portion in the circumferential direction and that engages with the inner peripheral portion of the resin tube at a plurality of outer peripheral portions. Even if it adopts a configuration in which the engaging claw of the retaining member is supported from the inside by a resilient rubber ring fitted in the annular recess. Good. Further, the engaging tooth portion is formed by the above-described two types of first and second retaining members, and the engaging claws of the second retaining member are supported from the inside by a rubber ring having elasticity. It is also possible to do.

  As described above, the resin pipe connection joint of the present invention is formed so that the connecting tube portion is formed of a thin tube, and the engaging tooth portion separated from the connecting tube portion is fitted into the annular recess formed in the tube wall of the thin tube. By holding, the engagement tooth portion exerts a retaining action by engaging the inner peripheral surface of the resin tube as in the conventional case, and the inner diameter of the annular recess is approximated to the inner diameter of the resin tube. As a result, in the pipe employing the resin pipe connection joint, it is possible to ensure a fluid flow rate that matches the inner diameter of the resin pipe. Therefore, it becomes possible to use a resin pipe thinner than the conventional one, which helps to significantly reduce the cost required for the resin pipe and piping construction. For soft resin pipes, it is possible to give watertight connectivity to the outer peripheral surface of the connecting cylinder, and watertight connectivity can be achieved with a seal ring regardless of whether the resin pipe is soft or hard. Therefore, it is possible to provide a resin pipe connection joint that has no problem in watertight connection.

  Furthermore, by separating the engaging tooth portion from the connecting tube portion, it becomes possible to adopt various configurations for the configuration of the engaging tooth portion, which enhances the retaining action of the resin tube. Useful.

  FIG. 1 is a half side view of a resin pipe connection joint according to an embodiment of the present invention, and FIG. 2 is a longitudinal side view showing the state of use. In this connection joint, when the connection cylinder part 10 is formed by a thin wall pipe (thin wall pipe) having a wall thickness of about 0.3 to 1 mm, and used for a home hot water supply pipe or a home water supply pipe, A stainless steel pipe excellent in rust resistance is suitably employed as the thin-walled pipe. In addition, the thin tube is employed whose outer diameter is substantially the same as the inner diameter D1 of the resin tube (resin hose) 100 connected to the connection tube portion 10 or slightly larger than the inner diameter of the resin tube. ing.

  As shown in FIG. 1, a wide annular recess 11 and a narrow annular groove 12 are formed concentrically on the tube wall of the connecting tube portion 10, and the ring shaped recess is formed in the wide annular recess 11. A metal engaging tooth portion 20 as a stop member, and a seal ring 31 made of a rubber ring such as an elastic O-ring that is disposed in contact with the end face of the engaging tooth portion 20 are accommodated. On the other hand, the narrow annular groove 12 also accommodates a seal ring 32 made of a rubber ring such as an O-ring having elasticity.

  FIG. 8A is a half side view of the engaging tooth portion 20 as a retaining member, and FIG. 8B is a front view of the engaging tooth portion 20, and as shown in FIG. 20 includes an annular engagement tooth 21 that forms a sawtooth cross-sectional shape at a plurality of axial positions on the outer peripheral surface thereof, and a portion in the circumferential direction of the engagement tooth portion 20 is omitted to expand and contract. It is possible. Therefore, the engaging tooth portion 20 is fitted into the wide annular recess 11 through the operation of fitting into the connecting tube portion 10 shown in FIG. After that, the engagement tooth portion 20 is restored to its initial shape by its own elasticity, and the engagement tooth 21 is held in a state of protruding slightly to the outside of the outer peripheral surface of the connection tube portion 10.

  In this embodiment, a hook-shaped retaining portion 10a is formed at the base portion of the connecting tube portion 10, and fastening is performed by a cap nut that is rotatably and slidably fitted to the connecting tube portion 10 by the retaining portion 10a. The tool 50 is retained.

  As shown in FIG. 2, when the resin tube 100 is inserted and inserted into the connecting tube portion 10, the engagement teeth 21 of the engagement tooth portion 20 engage with the inner peripheral portion of the resin tube 100 and the resin tube 100 is pulled out. At the same time, the two seal rings 31 and 32 are in close contact with two locations on the inner peripheral portion of the resin tube 100 to seal the locations in a watertight manner. Here, the engaging tooth portion 20 engages with the inner peripheral portion of the resin tube 100 and prevents the resin tube 100 from coming off. The engaging tooth portion 3 of the connection joint 1 described with reference to FIG. This action is exhibited in the same state as the action of engaging with the inner peripheral portion and preventing the resin tube 100 from coming off. Therefore, according to this embodiment, the retaining action equivalent to that of the connection joint 1 described with reference to FIG. 14 is exhibited, and at the same time, the watertight connectivity by the engagement tooth portion 20 is also that of the connection joint 1 described with reference to FIG. Played in the same way as the case. From this, in the connection joint of this embodiment, the watertight connectivity at the connection location is exhibited at three locations by the engagement tooth portion 20 and the two seal rings 31, 32, and in the case of FIG. More reliable watertight connectivity can be obtained.

  On the other hand, in this embodiment, the engagement tooth portion 20 is not formed by cutting the connection tube portion 10, but the engagement tooth portion 20 is separated from the connection tube portion 10 and the connection tube portion 10 is separated from the connection tube portion 10. In addition, after being manufactured by cutting or molding, it is fitted and held in the annular recess 11 of the connecting tube portion 10. Therefore, the engagement tooth portion 20 is only required to have sufficient strength to prevent the resin tube 100 from being pulled out, and is not required to have bending strength or breakage strength. Bending strength and bending strength are ensured by the connecting tube portion 10. Therefore, it is not necessary to form the engaging tooth portion 20 so thickly. As a result, the depth of the annular recess 11 of the connecting tube portion 10 may be formed to a depth corresponding to the thickness of the engaging tooth portion 20. It is not necessary to form the annular recess 11 so deeply. In addition, since the connecting tube portion 10 is formed by a thin tube having a tube wall thickness of about 0.3 to 1 mm, the inner diameter D3 of the connecting tube portion 10 at the formation position of the annular recess 11 shown in FIG. This is larger than the inner diameter D2 of the connecting tube portion 2 shown in FIG. In other words, the inner diameter D3 of the connecting tube portion 10 at the location where the annular recess 11 is formed is larger than the inner diameter D2 of the connecting tube portion 3 formed by cutting the engaging tooth portion 10 as in FIG. Thus, the inner diameter D1 of the resin tube 100 is approximated. Further, since the depth of the annular groove portion 12 holding the seal ring 32 can be formed to be equal to that of the annular recess portion 11, the inner diameter of the formation location of the annular groove portion 12 is set at the formation location of the annular recess portion 11. It is not necessary to make it smaller than the inner diameter D3 of the connecting cylinder portion 10.

  From these facts, in the connection joint of this embodiment, the fluid flow rate secured by the connection tube portion 10 is determined by the inner diameter of the annular recess 11 of the thin tube, and the inner diameter of the annular recess 11 is the inner diameter of the resin tube. Therefore, even if the fluid flow rate mainly depends on the inner diameter of the annular recess 11, the flow rate approximates the flow rate allowed by the resin pipe 100. Therefore, in the pipe adopting this connection joint, a flow rate corresponding to the inner diameter of the resin pipe 100 is secured, and it is not necessary to use a resin pipe having an inner diameter larger than necessary as in the case of FIG. In other words, when a flow rate equivalent to that in the case of FIG. 14 is ensured, a remarkable effect that an inexpensive thin resin tube 100 can be used is exhibited.

  FIG. 3 is a half-cut side view showing a modified example of the connecting joint described with reference to FIG. In this case, one seal ring 31 of the connection joint in FIG. 2 is taken out from the annular recess 11, and the seal ring 31 and the other seal ring 32 are removed from the portion where the annular recess 11 of the connection cylinder portion 10 is formed. It is made to hold | maintain separately to the annular groove parts 12 and 13 formed in two places of the front end side part. Also by this, an effect equivalent to that of the connection joint already described with reference to FIGS. 1 and 2 is exhibited. In the case of FIG. 3, the same reference numerals are given to the same or corresponding parts as in FIG. 2 in order to avoid duplication of explanation.

  FIG. 4 is a half-cut side view showing another modified example of the connection joint described with reference to FIG. This is an example in which a connecting tube portion 10 having the same configuration as that described with reference to FIG. 1 is connected to an end portion of a corrugated region Z of a thin-walled tube. In the waveform region Z, the mountain-shaped annular portion 14 and the valley-shaped annular portion 15 are arranged in the axial direction, and can be bent through deformation of the mountain-shaped annular portion 14 and the valley-shaped annular portion 15. And the formation location of the one mountain-shaped annular part 14 located in the edge part of the waveform area | region Z collides with the edge part of the resin pipe 100 inserted in the connection cylinder part 10, and the fitting margin of the resin pipe 100 is controlled. A raised portion 16 is also formed.

  FIG. 5 is a half-cut side view showing another modified example of the connection joint described with reference to FIG. This is an example in which the connecting tube portion 10 having the same configuration as that described with reference to FIG. 3 is connected to the end portion of the bendable waveform region Z of the thin-walled tube. Is the same as in the case of FIG. As shown in FIG. 5, when the formation portion of one mountain-shaped annular portion 14 located at the end of the corrugated region Z forms the raised portion 16, the resin tube 100 inserted into the connecting tube portion 10 as shown in FIG. 5. The end portion of the resin tube 100 is abutted against the raised portion 16, and the fitting allowance of the resin tube 100 is restricted to a certain length. Further, in FIG. 5, the resin tube 100 inserted into the connecting tube portion 10 is tightened with the fastening ring 200 to increase the degree of engagement between the engagement tooth portion 20 and the inner peripheral portion of the resin tube 100, and the seal ring. Adhesion with 31 is improved. Therefore, in this case, the retaining performance and the watertight connectivity are further improved. Other configurations and operations are the same as those of the connection joint described above with reference to FIG. 1, FIG. 2, or FIG. 3, and the same reference numerals are used for the same or corresponding parts as in FIG. Is attached.

  FIG. 6 is a half-cut sectional view showing still another modification. In this case, the annular recess 11 of the connecting tube portion 10 is formed in two portions in the axial direction of the tube wall, and the engagement teeth 20 are fitted and held in the respective annular recesses 11, 11. . In this example, the annular groove 12 is provided only at one place, and the seal ring 32 is accommodated in the annular groove 12. According to this example, the resin pipe inserted into the connecting tube portion 10 is prevented from coming off by the separate engaging tooth portions 20, 20 held in the two annular recesses 11, 11. The retaining action by the toothed portions 20, 20 is more reliably exhibited. In this case, a fastener 300 made of a bushing is attached to the opposite side of the connecting tube portion 10 with the corrugated region Z interposed therebetween. Other configurations and operations are the same as those of the connection joint described above with reference to FIG. 1, FIG. 2, or FIG. 4, and the same reference numerals are used for the same or corresponding parts as in FIG. Is attached.

  FIG. 7 is a half sectional view showing still another modification. In this case, the seal rings 31 and 32 in the case shown in FIG. 5 are omitted, and the two annular groove portions 12 and 13 are omitted, so that the tip of the connecting tube portion 10 is formed at the tip of the annular recess 11. The outer peripheral surface of the side portion is formed as a cylindrical surface 17 that is in water-tight contact with the inner peripheral surface of the soft resin tube fitted to the connecting tube portion 10. With this configuration, the inner peripheral surface of the soft resin tube inserted into the connecting tube portion 10 is brought into close contact with the cylindrical surface 17 and watertight connectivity is exhibited. Other configurations and operations are the same as those of the connection joint described above with reference to FIG. 1, FIG. 2, FIG. 5, and the like. Is attached.

  FIG. 9 is a half-cut side view showing a modified example of the connection joint described with reference to FIG. In this case, the engagement tooth portion 20 of the connection joint in FIG. 3 is made deformable by expanding and contracting by omitting one portion in the circumferential direction, and is engaged with the inner peripheral portion of the resin pipe at a plurality of outer peripheral portions. After replacing the engaging tooth portion 20a as a sheet metal retaining member provided with the engaging claws 21a inclined, the engaging claws 21a of the engaging tooth portions 20a were fitted into the annular recess 11 It is supported from the inside by a rubber ring 25 having elasticity. In FIG. 10, in the connection joint of FIG. 9, the resin tube 100 inserted into the connection tube portion 10 is tightened with the fastening ring 200, whereby the engagement claw 21 a of the engagement tooth portion 20 a and the inner peripheral portion of the resin tube 100. The degree of engagement of the seal ring 32 is increased and the adhesion with the seal ring 32 is enhanced. Therefore, in this case, the retaining performance and the watertight connectivity are further improved. Other configurations and operations are the same as those of the connection joint described above with reference to FIG. 1, FIG. 2, or FIG. 3, and the same reference numerals are used for the same or corresponding parts as in FIG. Is attached.

  11 (A) and 11 (B) show the engaging tooth portion 20a, which is manufactured by punching a sheet metal and is inclined at a plurality of equiangular positions on the outer peripheral surface. The engaging claw 21a is provided.

  FIG. 12 is a half-cut side view showing a modification of the connection joint described with reference to FIG. In this example, the engaging tooth portion 20 described in FIG. 8 is the first retaining member, the engaging tooth portion 20a described in FIG. 11 is the second retaining member, and the annular recess is the first recess 11a. And the second concave portion 11b, the first concave portion 11a holds the engaging tooth portion 20 as the first retaining member, and the second concave portion 11b has the engaging tooth portion 20a as the second retaining member. The engaging claw 21a of the engaging tooth portion 20a as the second retaining member is supported from the inside by a rubber ring 25 having elasticity that is fitted in the second recess 11b. In FIG. 13, in the connection joint of FIG. 9, the resin tube 100 inserted into the connection tube portion 10 is tightened with the fastening ring 200, whereby the engagement claw 21 a of the engagement tooth portion 20 a and the inner peripheral portion of the resin tube 100. The degree of engagement and the degree of engagement between the engagement tooth portion 20 and the inner peripheral portion of the resin tube 100 are increased, and the adhesion with the seal ring 31 is enhanced. Therefore, in this case, the retaining performance and the watertight connectivity are further improved. Other configurations and operations are the same as those of the connection joint described above with reference to FIG. 9, and the same reference numerals are given to the same or corresponding parts as in FIG. 9 in order to avoid duplication of explanation.

  Since the present invention proposes the configuration of the connection tube portion 10 and the engagement tooth portion 20 of the connection joint, the other tube connected to the resin tube 100 inserted into the connection tube portion and the connection joint. As for the configuration of the connection with the other pipes, whether using a fastener as shown in FIG. 1 or the like, or using a fastener as shown in FIG. It may be what is.

It is a half side view of the resin pipe connection joint according to the embodiment of the present invention. It is the vertical side view which showed the use condition of the connection coupling of FIG. It is the half-cut side view which showed the modification of the connection coupling demonstrated with reference to FIG. It is the half-cut side view which showed the other modification of the connection coupling demonstrated with reference to FIG. It is the half-cut side view which showed the other modification of the connection coupling demonstrated with reference to FIG. It is a half cut sectional view showing other modifications. It is a half cut sectional view showing other modifications. (A) is a half-cut side view of an engaging tooth part, (B) is a front view of an engaging tooth part. It is the half-cut side view which showed the modification of the connection coupling demonstrated with reference to FIG. It is the vertical side view which showed the use condition of the connection coupling of FIG. (A) is a half-cut side view of another engaging tooth part, (B) is a front view of the engaging tooth part. It is the half-cut side view which showed the modification of the connection coupling of FIG. It is the vertical side view which showed the use condition of the connection coupling of FIG. It is the vertical side view which showed the use condition of the prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Engagement tooth part formed by cutting in connection cylinder part 10 Connection cylinder part 11 Annular recessed part 11a 1st recessed part 11b 2nd recessed part 12, 13 Annular groove part 14 Angle-shaped annular part 16 Raised part 20 Engaging tooth part 20a Engagement Tooth part 21a Engaging claw 25 Rubber ring 31, 32 Seal ring 100 Resin pipe Z Waveform area

Claims (9)

In the resin tube connection joint in which the engagement tooth portion that engages with the inner peripheral portion of the resin tube and prevents the resin tube is formed by cutting in the connection tube portion into which the resin tube is inserted,
Instead of forming the engaging tooth portion in the connecting tube portion by cutting, the connecting tube portion is formed by a thin-walled tube, and the engaging tooth portion is separated from the connecting tube portion and the tube of the thin-walled tube is formed. The annular recess formed in the wall is held in a fitting manner, and the inner diameter of the annular recess is expanded from the inner diameter of the connecting tube portion formed by cutting the engaging tooth portion. Resin pipe connection joints characterized in that In the resin pipe connection joint provided with an engagement tooth portion that engages with the inner peripheral portion of the resin tube and prevents the resin tube from being connected to the connection cylinder portion into which the resin tube is inserted,
The connection tube portion is formed of a thin-walled tube, and the engagement tooth portion is separated from the connection tube portion and held in a fitting shape in an annular recess formed on the tube wall of the thin-wall tube. Resin pipe joint. The outer peripheral surface of the tip side portion of the connecting cylinder portion is formed as a cylindrical surface that is in close contact with the inner peripheral surface of the soft resin tube fitted to the connecting cylinder portion. The resin pipe connection joint according to claim 1 or 2. An annular groove portion that holds a seal ring that is water-tightly attached to the inner peripheral surface of the resin tube fitted to the connection cylinder portion is provided at a tip side portion of the connection cylinder portion with respect to the formation portion of the annular recess. The resin pipe connection joint according to claim 1 or 2. 5. The bulging portion for restricting the fitting allowance of the resin tube formed by abutting the end of the resin tube fitted to the connecting tube portion on the connecting tube portion. The resin pipe connection joint described in item 1. The resin pipe connection joint according to claim 5, wherein the raised portion is formed by a chevron-shaped annular portion at an end of a bendable corrugated region formed in the connection cylinder portion. The retaining tooth portion is formed by a retaining member having a ring-shaped engaging tooth continuous in a sawtooth shape at a plurality of axial positions on the outer circumferential surface, with one circumferential circumferential portion being removed and capable of expanding and contracting in diameter. The resin pipe connection joint according to claim 2 formed. The engaging tooth portion is provided with inclined engaging claws that are deformable to expand and contract in diameter by removing one portion in the circumferential direction and that engage with the inner peripheral portion of the resin tube at a plurality of locations on the outer peripheral portion. 3. The resin pipe connection joint according to claim 2, wherein the resin pipe connection joint is made of a sheet metal retaining member, and an engaging claw of the retaining member is supported from the inside by an elastic rubber ring fitted in the annular recess. . The engaging tooth portion is composed of the first retaining member described in claim 7 and the second retaining member described in claim 8, and the annular recess is the first retaining member. Is divided into a first recess in which the second retaining member is held in a fitting state, and a second recess in which the second retaining member is held in a fitting state, and the engaging claw of the second retaining member is the second The resin pipe connection joint according to claim 2, wherein the resin pipe connection joint is supported from the inside by an elastic rubber ring fitted in the recess.

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