JP6754306B2 - Resin pipe fittings - Google Patents

Description

The present invention relates to a resin pipe joint having a core portion inserted inside the resin pipe.

Conventionally, as this type of resin pipe joint, one in which an annular protrusion is formed on the outer peripheral surface of the core portion is known. In such a resin pipe joint, the core portion is inserted into the resin pipe, and the resin pipe is tightened from the outside with a fastener to seal between the inner peripheral surface of the resin pipe and the outer peripheral surface of the core portion. (See, for example, Patent Document 1).

Japanese Patent No. 551601 (paragraphs [0018] to [0025], FIGS. 1 and 2)

In the conventional resin pipe joint described above, when the core portion is inserted into the resin pipe, the resin pipe is deformed so as to expand outward by the protrusion formed on the outer peripheral surface of the core portion. However, since this protrusion is formed in an annular shape, the portion where the resin tube is deformed is concentrated at one position in the axial direction. As a result, it becomes difficult to deform the resin pipe, and there is a problem that it is difficult to insert the core portion into the resin pipe.

An object of the present invention is to provide a resin pipe joint in which a core portion can be easily inserted into a resin pipe.

The invention of claim 1 made to achieve the above object is a joint for a resin pipe having a tubular core portion inserted inside a resin pipe and having an annular protrusion protruding from the outer peripheral surface of the core portion. In the annular protrusion, the tip facing surface forming a surface of the annular protrusion facing the tip end side of the core portion and the proximal end forming a surface of the annular protrusion facing the proximal end side of the core portion. It has a facing surface and a maximum outer diameter portion which is composed of a boundary portion between the tip facing surface and the proximal end facing surface and which is formed by connecting a portion farthest from the central axis of the core portion in the circumferential direction. The maximum outer diameter portion is arranged along an inclined surface that diagonally intersects the central axis of the core portion, and the tip facing surface is formed in a tapered shape that is reduced in diameter toward the tip side of the core portion. The minimum outer diameter portion formed by connecting the portion closest to the central axis of the core portion in the circumferential direction is provided at the edge portion on the distal end facing surface on the distal end side of the core portion, and the proximal end facing surface is formed. This is a resin pipe joint that rises along the radial direction from the outer peripheral surface of the core portion.

According to the second aspect of the present invention, in the resin pipe joint according to the first aspect, the tip facing surface is formed in a tapered shape in which the diameter is reduced toward the tip side of the core portion along the central axis of the core portion. The degree of diameter reduction of the tip-facing surface becomes looser as the distance between the maximum outer diameter portion and the minimum outer diameter portion in the central axis direction of the core portion increases in the circumferential direction of the tip-facing surface.

The invention of claim 3 is a pair of resin pipe joints according to claim 1 or 2, in which the maximum outer diameter portions are inverted by 180 degrees around the central axis of the core portion as the annular protrusion. Has a mutually inverted annular protrusion.

The invention of claim 4 is a large-diameter annular protrusion having a different diameter of the maximum outer diameter portion as the annular protrusion in the resin pipe joint according to any one of claims 1 to 3. It has a portion and a small-diameter annular protrusion, and the small-diameter annular protrusion is arranged on the tip side of the core portion in the insertion direction with respect to the large-diameter annular protrusion.

According to a fifth aspect of the present invention, in the resin pipe joint according to the fourth aspect, the maximum outer diameter portion of the large diameter annular protrusion is the most tip side of the maximum outer diameter portion in the central axial direction of the core portion. It is curved toward the tip end side of the core portion with respect to the inclined surface passing through the tip end side end point arranged in and the proximal end side end point arranged on the most proximal side.

The invention of claim 6 further has a connecting portion to which the connection target of the resin pipe is connected in the resin pipe joint according to any one of claims 1 to 5, and the core portion is a core portion. It is rotatable around the central axis of the core portion with respect to the connection portion.

[Invention of claims 1, 4 and 5]
In the invention of claim 1, since the maximum outer diameter portion of the annular protrusion portion farthest from the central axis of the core portion is arranged along an inclined surface that diagonally intersects the central axis of the core portion, the resin tube When the core portion is inserted into the inside of the resin tube, it is possible to prevent the portion of the resin tube whose diameter is expanded by the annular protrusion from being concentrated at one location in the axial direction of the resin tube. This makes it easy to insert the core portion into the resin tube. Further, since the tip-facing surface of the annular protrusion facing the tip end side is formed in a tapered shape whose diameter is reduced toward the tip end side of the core portion, the core portion can be easily inserted. Further, in the annular protrusion, the base end facing surface facing the base end side of the core portion rises along the radial direction from the outer peripheral surface of the core portion, so that the annular protrusion easily bites into the inner surface of the resin pipe. The core part does not easily come off from the resin tube.

Here, when the annular protrusion has a large-diameter annular protrusion and a small-diameter annular protrusion having different diameters of the maximum outer diameter portion, the small-diameter annular protrusion is on the tip side of the large-diameter annular protrusion. If it is arranged in, the core portion can be easily inserted into the resin tube (invention of claim 4). In this case, the maximum outer diameter portion of the large-diameter annular protrusion is the distal end point arranged on the most distal end side in the central axis direction of the core portion and the proximal end arranged on the most proximal side among the maximum outer diameter portions. If the configuration is curved toward the tip end side of the core portion with respect to the inclined surface passing through the side end point, the core portion is less likely to fall off from the resin tube, and the sealing property between the resin tube and the core portion can be improved. (Invention of claim 5).

[Invention of claim 2]
According to the invention of claim 2, the degree of contraction of the tip facing surface, that is, the degree of expansion of the annular protrusion is suppressed from increasing at once in the entire circumferential direction, and the core portion can be easily inserted into the resin tube. Become.

[Invention of claim 3]
In the invention of claim 3, since the maximum outer diameter portions of the pair of mutually inverted annular protrusions have the same relationship as the relationship between the right-hand thread and the left-hand thread, the resin tube rotates around the central axis of the core portion. At that time, the rotation of the resin tube with respect to the core portion is suppressed, and the core portion is suppressed from coming off from the resin tube.

[Invention of claim 6]
According to the invention of claim 6, when the resin tube is rotated around the central axis of the core portion in a state where the core portion is inserted into the resin tube, the core portion can rotate integrally with the resin tube. Therefore, it is possible to prevent the annular protrusion from damaging the inner surface of the resin pipe and deteriorating the sealing property between the core portion and the resin pipe.

Perspective view of the resin pipe fitting according to the first embodiment Side sectional view of resin pipe fitting Perspective view of the first joint structure as seen from the tip side Perspective view of the first joint configuration from the base end side Side view of the first joint structure Front view of the first joint structure Side sectional view of the tip side part of the core part FIG. 7 is an enlarged view of (A) around the end point on the base end side and (B) an enlarged view around the end point on the tip end side of the large-diameter annular protrusion. Side sectional view of the resin pipe fitting according to the second embodiment Side view of the first joint structure according to another embodiment Side view of the core portion according to another embodiment

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the resin pipe joint 10 of the present embodiment is joined by a connecting member 41 in a state where the tubular first joint component 21 and the second joint component 31 are coaxially arranged. Become. Hereinafter, in the resin pipe joint 10, the side on which the first joint component 21 is arranged is referred to as the tip side, and the side on which the second joint component 31 is arranged is referred to as the base end side as appropriate.

As shown in FIG. 2, a flange portion 22 is provided at an intermediate portion in the axial direction of the first joint structure 21. A portion of the first joint component 21 on the tip side of the flange portion 22 constitutes a core portion 11 inserted inside the resin pipe 80. The portion of the first joint component 21 on the proximal end side of the flange portion 22 constitutes the proximal end protrusion 23.

As shown in FIG. 1, a hexagonal flange portion 32 is provided at an intermediate portion in the axial direction of the second joint configuration body 31. Then, the tip cylinder portion 34 on the tip side of the hexagonal flange portion 32 of the second joint configuration body 31 is coupled to the first joint configuration body 21. Further, a portion of the second joint component 31 on the proximal end side of the hexagonal flange portion 32 constitutes a male screw portion 33. The male screw portion 33 is screwed with the female screw portion 91 formed in the equipment pipe 90 to be connected to the resin pipe 80 (FIG. 2).

As shown in FIG. 2, an outer step portion 35 is formed on the outer peripheral surface of the tip tubular portion 34 so that the diameter of the tip side is stepped from the intermediate position in the axial direction. That is, the tip tubular portion 34 is composed of a large diameter portion 34A arranged on the tip side of the outer step portion 35 and a small diameter portion 34B arranged on the proximal end side of the outer step portion 35.

The large diameter portion 34A receives the proximal end protrusion 23 inward. Further, the large diameter portion 34A is abutted against the flange portion 22 of the first joint component 21. The base end protrusion 23 and the large diameter portion 34A are sealed by an O-ring 38.

Specifically, the inner peripheral surface of the large-diameter portion 34A is provided with an inner stepped portion 36 whose tip side is stepped in diameter. The portion of the large diameter portion 34A that is arranged on the proximal end side from the inner step portion 36 is formed in a shape corresponding to the end portion of the proximal end protrusion 23, and is the inner step portion of the inner peripheral surface of the large diameter portion 34A. The portion arranged on the tip side from 36 forms an annular gap with the base end protrusion 23. An O-ring 38 is arranged in the annular gap. The inner diameter of the small diameter portion 34B is substantially the same as the inner diameter of the base end protrusion 23.

As shown in FIG. 1, the connecting member 41 is formed in a ring shape. Then, in the connecting member 41, the flange portion 22 and the tip tubular portion 34 are viewed from the outside in a state where the base end protrusion 23 of the first joint configuration 21 is received in the tip tubular portion 34 of the second joint configuration 31. surround. As shown in FIG. 2, a receiving groove 44 extending in the entire circumferential direction is formed in the intermediate portion in the axial direction on the inner peripheral surface of the connecting member 41. Then, a portion of the connecting member 41 on the distal end side of the receiving groove 44 constitutes the distal end engaging protrusion 42, and a portion on the proximal end side of the receiving groove 44 constitutes the proximal end engaging protrusion 43.

The receiving groove 44 receives the flange portion 22 of the first joint configuration body 21 and the large diameter portion 34A of the tip protrusion 34 of the second joint configuration body 31. The tip engaging protrusion 42 is sandwiched between the flange portion 22 of the first joint structure 21 and the resin pipe 80. The base end engaging protrusion 43 is sandwiched between the hexagonal flange portion 32 of the second joint component 31 and the large diameter portion 34A. Then, the tip engaging protrusion 42 and the proximal engaging protrusion 43 sandwich the flange portion 22 and the large diameter portion 34A in the axial direction, whereby the first joint configuration body 21 and the second joint configuration body 31 are coupled. To. The flange portion 22 of the first joint configuration body 21, the large diameter portion 34A of the second joint configuration body 31, and the receiving groove 44 of the connecting member 41 are formed in a circular shape, for example, and the first joint configuration body 21 Is rotatable around the axis with respect to the second joint component 31.

As shown in FIG. 1, in the resin pipe joint 10 of the present embodiment, a plurality of annular protrusions 12 project from the outer peripheral surface of the core portion 11. Then, as shown in FIG. 2, when the resin tube 80 is tightened from the outside by the clip 81 in a state where the core portion 11 is inserted into the resin tube 80, the annular protrusion 12 bites into the inner surface of the resin tube 80. As a result, the space between the core portion 11 and the resin tube 80 is sealed.

As shown in FIGS. 3 and 4, the annular protrusion 12 has a tip facing surface 14 forming a surface facing the tip end side of the core portion 11 and a proximal end direction forming a surface facing the proximal end side of the core portion 11. It has a surface 15. The boundary portion between the tip-facing surface 14 and the proximal-facing surface 15 is the maximum outer diameter portion 13 formed by connecting the portions of the annular protrusion 12 farthest from the central axis 11J of the core portion 11 over the entire circumferential direction. There is.

As shown in FIG. 5, the maximum outer diameter portion 13 is arranged along an inclined surface K1 that diagonally intersects the central axis 11J of the core portion 11. The maximum outer diameter portion 13 is formed in a circular shape when viewed from the direction along the central axis 11J of the core portion 11 (see FIG. 6).

As shown in FIGS. 3 and 5, the tip facing surface 14 is formed in a tapered shape in which the diameter is reduced toward the tip side of the core portion 11. The edge portion on the distal end side of the distal end facing surface 14 constitutes a minimum outer diameter portion 16 formed by connecting a portion of the outer peripheral surface of the annular protrusion 12 closest to the central axis 11J of the core portion 11 in the circumferential direction. Specifically, the tip-facing surface 14 is formed in a tapered shape coaxial with the central axis 11J of the core portion 11, and the minimum outer diameter portion 16 is arranged in a plane orthogonal to the central axis 11J of the core portion 11. The minimum outer diameter portion 16 has a circular shape concentric with the core portion 11 (see FIG. 6).

Specifically, the inclination of the tip facing surface 14 differs depending on the circumferential position of the tip facing surface 14. Specifically, as the distance between the maximum outer diameter portion 13 and the minimum outer diameter portion 16 in the circumferential direction of the tip facing surface 14 along the central axis 11J of the core portion 11 increases, the inclination of the tip facing surface 14 increases. Become gradual. According to this configuration, it is suppressed that the inclination of the tip facing surface 14 (that is, the degree of expansion of the annular protrusion 12) suddenly increases in the entire circumferential direction, and the core portion 11 can be inserted into the resin tube 80. It will be easy.

As shown in FIG. 4, the base end facing surface 15 rises along the radial direction from the outer peripheral surface of the core portion 11. The base end facing surface 15 is arranged along the inclined surface K1 (see FIG. 7).

By the way, in the present embodiment, four annular protrusions 12 are formed. In the following, four annular protrusions will be referred to as a first annular protrusion 12A, a second annular protrusion 12B, a third annular protrusion 12C, and a fourth annular protrusion 12D in order from the annular protrusion 12 on the tip side. Part 12 will be appropriately distinguished.

The maximum outer diameter portion 13 of the first annular protrusion 12A and the second annular protrusion 12B is formed to have a smaller diameter than the maximum outer diameter portion 13 of the third annular protrusion 12C and the fourth annular protrusion 12D. The maximum outer diameter portion 13 of the first annular protrusion 12A and the second annular protrusion 12B is formed to have the same diameter, and the maximum outer diameter portion 13 of the third annular protrusion 12C and the fourth annular protrusion 12D is formed to have the same diameter. Has been done. As described above, in the present embodiment, of the four annular protrusions 12, the two annular protrusions 12 arranged on the tip end side of the core portion 11 are the remaining two arranged on the base end side of the core portion 11. The diameter is smaller than that of the annular protrusion 12. According to this configuration, the core portion 11 is inserted into the resin tube 80 as compared with the case where the annular protrusion 12 arranged on the tip side has a larger diameter than the annular protrusion 12 arranged on the base end side. Becomes easier. The third annular protrusion 12C and the fourth annular protrusion 12D are arranged so as to be within the tightening range of the clip 81, and contribute to the sealing between the core portion 11 and the resin tube 80 (see FIG. 2). The first annular protrusion 12A and the second annular protrusion 12B contribute to preventing the core portion 11 inserted into the resin pipe 80 from coming off.

When the first annular protrusion 12A and the second annular protrusion 12B are arranged at the same position in the axial direction of the core portion 11, they are inverted 180 degrees around the central axis 11J of the core portion 11. It has become. Therefore, the direction in which the maximum outer diameter portion 13 of the first annular protrusion 12A is inclined with respect to the central axis 11J of the core portion 11 (in the example of FIG. 5, it is inclined downward to the right) and the second annular protrusion. The direction in which the maximum outer diameter portion 13 of the portion 12B is inclined with respect to the central axis 11J of the core portion 11 (in the example of FIG. 5, it is inclined upward to the right) is opposite to each other. As described above, the maximum outer diameter portion 13 of the first annular protrusion 12A and the maximum outer diameter portion 13 of the second annular protrusion 12B have the same relationship as the right-hand thread and the left-hand thread. According to this configuration, the resin tube 80 is suppressed from rotating about the axis with respect to the core portion 11, and the core portion 11 is suppressed from being detached from the resin tube 80.

In the present embodiment, the relationship between the third annular protrusion 12C and the fourth annular protrusion 12D is similar to the relationship between the first annular protrusion 12A and the second annular protrusion 12B. That is, when the third annular protrusion 12C and the fourth annular protrusion 12D are arranged at the same position in the axial direction of the core portion 11, they are inverted 180 degrees around the central axis 11J of the core portion 11. It is in a relationship.

As shown in FIGS. 5 and 7, the angle α at which the maximum outer diameter portion 13 of the first annular protrusion 12A and the second annular protrusion 12B is inclined with respect to the central axis 11J of the core portion 11 (FIGS. 5 and 7). In the inclination angle α) of the inclined surface K1 shown on the tip end side of the core portion 11 with respect to the central axis 11J, the maximum outer diameter protrusion 13 of the third annular protrusion 12C and the fourth annular protrusion 12D is the core portion 11. It is larger than the angle β tilted with respect to the central axis 11J of the above (in FIGS. 5 and 7, the angle β with respect to the central axis 11J of the inclined surface K1 shown on the proximal end side of the core portion 11). In other words, the maximum outer diameter portion 13 of the third annular protrusion 12C and the fourth annular protrusion 12D is the center of the core portion 11 rather than the maximum outer diameter portion 13 of the first annular protrusion 12A and the second annular protrusion 12B. It is arranged so as to be gently inclined with respect to the shaft 11J.

As shown in FIG. 5, in the third annular protrusion 12C and the fourth annular protrusion 12D, the tip side end point 13A arranged on the most tip side of the maximum outer diameter portion 13 and the most base end side are arranged. The base end side end point 13B is arranged on the inclined surface K1, and the entire maximum outer diameter portion 13 is curved toward the tip end side of the core portion 11 with respect to the inclined surface K1.

FIG. 8A shows the periphery of the base end side end point 13B at the maximum outer diameter portion 13 of the third annular protrusion 12C. As shown in the figure, the base end facing surface 15 of the third annular protrusion 12C is an outer peripheral surface of the core portion 11 so as to move toward the base end side as the distance from the core portion 11 increases around the base end side end point 13B. Tilt against. As a result, the third annular protrusion 12C is more likely to bite into the resin tube 80 (see FIG. 2) around the base end end point 13B as compared with the case where the maximum outer diameter portion 13 is arranged on the inclined surface K1. Become. Further, FIG. 8B shows the periphery of the distal end point 13A at the maximum outer diameter portion 13 of the third annular protrusion 12C. As shown in the figure, the third annular protrusion 12C is substantially orthogonal to the outer peripheral surface of the core portion 11 around the distal end point 13A. As a result, the third annular protrusion 12C is more likely to be caught by the resin tube 80 around the distal end point 13A as compared with the case where the maximum outer diameter portion 13 is arranged on the inclined surface K1. As described above, in the present embodiment, the maximum outer diameter portion 13 of the third annular protrusion 12C is curved toward the tip end side of the core portion 11 with respect to the inclined surface K1, so that the core portion 11 falls off from the resin tube 80. It becomes difficult, and the sealing property between the resin tube 80 and the core portion 11 can be improved. Although not shown, the periphery of the distal end point 13A and the periphery of the proximal end point 13B at the maximum outer diameter portion 13 of the fourth annular protrusion 12D have the same configuration as the third annular protrusion 12C. There is.

In the example of the present embodiment, the maximum outer diameter portion 13 of the first annular protrusion 12A and the second annular protrusion 12B is arranged in substantially the same plane as the inclined surface K1, but the third annular protrusion 12A. It may be curved toward the tip end side of the core portion 11 like the maximum outer diameter portion 13 of the 12C and the fourth annular protrusion 12D.

This concludes the description of the configuration of the resin pipe joint 10 of the present embodiment. In the present embodiment, the male threaded portion 33 of the second joint configuration 31 corresponds to the "connecting portion" of the present invention, and each of the first annular protrusion 12A and the second annular protrusion 12B is the "connection portion" of the present invention. It corresponds to the "small diameter annular protrusion", and each of the third annular protrusion 12C and the fourth annular protrusion 12D corresponds to the "large diameter annular protrusion" of the present invention. Further, each set of the first annular protrusion 12A, the second annular protrusion 12B, the third annular protrusion 12C, and the fourth annular protrusion 12D is the "pair of mutually inverted annular protrusions" of the present invention. To configure.

Next, the action and effect of the resin pipe joint 10 will be described. In the resin pipe joint 10, since the maximum outer diameter portion 13 of the annular protrusion 12 is arranged along the inclined surface K1 that diagonally intersects the central axis 11J of the core portion 11, the core is inside the resin pipe 80. When the portion 11 is inserted, it is possible to prevent the portion of the resin pipe 80 whose diameter is expanded by the annular protrusion 12 from being concentrated at one location in the axial direction of the resin pipe 80. This makes it easy to insert the core portion 11 into the resin tube 80. Moreover, in the third annular protrusion 12C and the fourth annular protrusion 12D having a diameter larger than that of the first annular protrusion 12A and the second annular protrusion 12B, the maximum outer diameter portion 13 is relative to the central axis 11J of the core portion 11. Since it is arranged so as to be gently tilted, it becomes difficult for the resin tube 80 to be locally expanded in diameter at one position in the axial direction.

Further, in the resin pipe joint 10, the tip facing surface 14 of the annular protrusion 12 facing the tip end side of the core portion 11 is formed in a tapered shape in which the diameter is reduced toward the tip end side of the core portion 11. The insertion of the portion 11 becomes easy. Further, since the base end facing surface 15 of the annular protrusion 12 facing the base end side of the core portion 11 rises along the radial direction from the outer peripheral surface of the core portion 11, the annular protrusion 12 is formed on the inner surface of the resin tube 80. The core portion 11 from the resin tube 80 is less likely to come off.

Further, in the present embodiment, when the resin tube 80 is rotated around the central axis 11J of the core portion 11 in a state where the core portion 11 is inserted into the resin tube 80, the core portion 11 is integrated with the resin tube 80. Since it is possible to rotate, it is possible to prevent the annular protrusion 12 from scratching the inner surface of the resin tube 80 and reducing the sealing property between the core portion 11 and the resin tube 80.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 9, the resin pipe joint 10V of the present embodiment is formed by integrally forming a core portion 11, a hexagonal flange portion 32, and a male screw portion 33 in the resin pipe joint 10 of the first embodiment. The flange portion 22, the base end protrusion 23, the tip protrusion 34, and the connecting member 41 are not provided. Since the configuration of each part of the resin pipe joint 10V is the same as that of the resin pipe joint 10, the description thereof will be omitted by adding the same reference numerals. The resin pipe joint 10V of the present embodiment can also achieve the same effect as the resin pipe joint 10.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. It can be changed and implemented.

(1) In the above embodiment, in the above embodiment, two sets of "a pair of mutually inverted annular protrusions" of the present invention are provided, but only one set may be provided, or three or more sets may be provided. It may be configured. In the former case, for example, the configuration may include only the third annular protrusion 12C and the fourth annular protrusion 12D.

(2) In the above embodiment, the maximum outer diameter portion 13 of the third annular protrusion 12C and the fourth annular protrusion 12D may be arranged in the inclined surface K1. Further, the maximum outer diameter portion 13 of the first annular protrusion 12A and the second annular protrusion 12B may be curved toward the tip end side of the core portion 11 with respect to the inclined surface K1.

(3) In the above embodiment, the size of the diameter of the maximum outer diameter portion 13 of the first annular protrusion 12A and the second annular protrusion 12B is the maximum outer diameter of the third annular protrusion 12C and the fourth annular protrusion 12D. It may be the same as the diameter of the portion 13.

(4) In the first embodiment, as in the first joint structure 21V shown in FIG. 10, the maximum outer diameter portions 13 of all the annular protrusions 12 have the same orientation with respect to the central axis 11J of the core portion 11. May be tilted to. That is, the first annular protrusion 12A and the second annular protrusion 12B overlap when they are arranged at the same position in the axial direction of the core portion 11, and the third annular protrusion 12C and the fourth annular protrusion 12C and the fourth annular protrusion 12C overlap. The 12Ds may overlap when they are arranged at the same position in the axial direction of the core portion 11. Even with such a configuration, since the first joint configuration body 21V is rotatable around the central axis 11J of the core portion 11 with respect to the second joint configuration body 31, the resin pipe 80 is the core portion 11. The core portion 11 can rotate integrally with the resin tube 80 even if it rotates around the central axis 11J of the above, and the annular protrusion 12 can prevent the inner surface of the resin tube 80 from being scratched.

(5) As in the core portion 11W shown in FIG. 11, the minimum outer diameter portion 16 of the third annular protrusion 12C and the fourth annular protrusion 12D may be arranged along a surface parallel to the inclined surface K1. .. In this case, the tip facing surface 14 has a tapered shape whose diameter is reduced toward the tip side of the core portion 11W along an axis orthogonal to the inclined surface K1. In the example of FIG. 11, the minimum outer diameter portion 16 of the first annular protrusion 12A and the second annular protrusion 12B may also be arranged along a plane parallel to the inclined surface K1.

10 Resin pipe joint 11, 11W Core part 12 Ring protrusion 13 Maximum outer diameter part 14 Tip facing surface 15 Base end facing surface 16 Minimum outer diameter part 21, 21V 1st joint component 31 2nd joint component 33 Male threaded part K1 slope

Claims (6)

In a resin pipe joint having a tubular core portion to be inserted inside a resin pipe and having an annular protrusion protruding from the outer peripheral surface of the core portion.
The annular protrusion
A tip-facing surface that constitutes a surface of the annular protrusion that faces the tip side of the core portion,
A base end facing surface constituting a surface of the annular protrusion facing the base end side of the core portion,
It has a maximum outer diameter portion that is composed of a boundary portion between the tip end facing surface and the base end facing surface and is formed by connecting a portion farthest from the central axis of the core portion in the circumferential direction.
The maximum outer diameter portion is arranged along an inclined surface that intersects the central axis of the core portion at an angle.
The tip facing surface is formed in a tapered shape whose diameter is reduced toward the tip side of the core portion, and the tip has a minimum outer diameter portion formed by connecting the portion closest to the central axis of the core portion in the circumferential direction. It is provided on the edge of the core portion on the facing surface on the tip end side.
The base end facing surface is a resin pipe joint that rises along the radial direction from the outer peripheral surface of the core portion. In the resin pipe fitting according to claim 1,
The tip facing surface is formed in a tapered shape in which the diameter is reduced toward the tip side of the core portion along the central axis of the core portion.
The degree of diameter reduction of the tip facing surface becomes looser as the distance between the maximum outer diameter portion and the minimum outer diameter portion in the central axial direction of the core portion increases in the circumferential direction of the tip facing surface. In the resin pipe fitting according to claim 1 or 2.
The annular protrusion has a pair of mutually inverted annular protrusions in which the maximum outer diameter portions are inverted by 180 degrees around the central axis of the core portion. In the resin pipe fitting according to any one of claims 1 to 3,
The annular protrusion has a large-diameter annular protrusion and a small-diameter annular protrusion having different diameters of the maximum outer diameter portion.
The small-diameter annular protrusion is arranged on the tip side of the core portion in the insertion direction with respect to the large-diameter annular protrusion. In the resin pipe fitting according to claim 4,
The maximum outer diameter portion of the large-diameter annular protrusion is the distal end point arranged on the most distal end side in the central axis direction of the core portion and the proximal end arranged on the most proximal side among the maximum outer diameter portions. It is curved toward the tip end side of the core portion with respect to the inclined surface passing through the side end point. In the resin pipe fitting according to any one of claims 1 to 5,
Further having a connecting portion to which the connection target of the resin pipe is connected,
The core portion is rotatable about the central axis of the core portion with respect to the connecting portion.