JP2017172760A - Joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint structure in which a core part can be easily inserted into a resin pipe.SOLUTION: A joint structure 100 of this invention comprises a resin pipe 50; a joint 10 for a resin pipe having a core part 15 inserted into the resin pipe 50; and a fastening tool 51 for fastening the resin pipe 50 from outside to seal between the core part 15 and the resin pipe 50. The outer peripheral surface of the core part 15 is formed with an annular crest part 20 where a location spaced apart most from a center axis J1 of the core part 15 is closed in a peripheral direction. The annular crest part 20 is constituted in such a way that it has a location extending along the center axis J1 of the core part 15 and different two positions of the annular crest part 20 in a peripheral direction are displaced in the central axis direction of the core part. Then, the annular crest part 20 is arranged in such a way that the fastening tool 51 is stored in a range for fastening the resin pipe 50 in a center axis direction of the core part 15.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a joint structure in which a cylindrical core portion provided in a joint is inserted into a resin pipe and the resin pipe is tightened from the outside by an annular fastener.

  Conventionally, as this type of joint structure, a structure in which an annular protrusion is formed on the outer peripheral surface of the core is known (for example, see Patent Document 1).

Japanese Patent No. 5516011 (paragraphs [0018] to [0025], FIGS. 1 and 2)

  In the conventional joint structure described above, when the core portion is inserted into the resin tube, the resin tube is deformed so as to spread 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 deformed portion of the resin tube is concentrated at one place in the axial direction. As a result, there has been a problem that it is difficult to deform the resin tube and it is difficult to insert the core portion into the resin tube.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a joint structure in which a core portion can be easily inserted into a resin pipe.

  In order to achieve the above object, the invention of claim 1 is characterized in that a cylindrical core portion provided in a joint is inserted into a resin tube, and the resin tube is tightened from the outside by an annular fastener. A joint structure in which a gap between a resin pipe and the core portion is sealed, and an outer peripheral surface of the core portion has an annular ridge portion in which a portion farthest from the central axis of the core portion is closed in the circumferential direction. At least one of the annular ridges has a portion extending along the central axis of the core part, and two different positions in the circumferential direction of the annular ridge part are shifted in the central axis direction of the core part. All of the annular ridge portions are joint structures arranged so as to be within a range in which the fastening tool fastens the resin pipe in the central axis direction of the core portion.

  According to a second aspect of the present invention, the annular ridge portion is disposed along an inclined surface inclined obliquely with respect to the central axis of the core portion, and is formed in an elliptical shape when viewed from a direction perpendicular to the inclined surface. The joint structure according to claim 1.

  The invention according to claim 3 is the joint structure according to claim 1 or 2, wherein only one annular ridge portion is formed on the outer peripheral surface of the core portion.

[Invention of claims 1 to 3]
In the present invention, the annular ridge formed on the outer peripheral surface of the core portion of the joint has a portion extending along the central axis of the core portion, and two different positions in the circumferential direction of the annular ridge portion are the center of the core portion. Since it is comprised so that it may slip | deviate to an axial direction, when a core part is inserted in a resin pipe, the site | part which an annular ridge part spreads a resin pipe outside will shift | deviate to the axial direction of a resin pipe. As a result, when the core portion is inserted into the resin tube, the deformed portion of the resin tube does not concentrate at one place in the axial direction, and the core portion can be easily inserted into the resin tube.

  Here, as in the invention of claim 2, the annular ridge portion is disposed along an inclined surface inclined obliquely with respect to the central axis of the core portion, and is elliptical when viewed from a direction perpendicular to the inclined surface. If the configuration is formed in the resin tube, the portion of the resin tube that is spread outward by the annular ridge portion is dispersed in the axial direction of the resin tube, and the core to the resin tube is secured while ensuring the sealing performance with the resin tube. It becomes possible to further facilitate the insertion of the part.

  Moreover, if it is set as the structure which provided only one cyclic | annular ridge part in the outer peripheral surface of the core part like invention of Claim 3, the number of the site | parts extended outside by the cyclic | annular ridge part among resin pipes will be decreased. It becomes possible to further facilitate the insertion of the core portion into the resin tube.

Side sectional view showing the joint structure according to the first embodiment Plastic pipe joint, fastener, and perspective view of resin pipe Side view of resin pipe joint (A) perspective view of joint for resin pipe, (B) perspective view seen from another direction Joint structure according to the second embodiment Plastic pipe joint, fastener, and perspective view of resin pipe (A) Side view of joint for resin pipes, (B) Viewed from the tip side (A) perspective view of joint for resin pipe, (B) perspective view seen from another direction (A) Side view and (B) Side sectional view showing the manufacturing process of a joint for resin pipes (A) Side view and (B) Side sectional view showing the manufacturing process of a joint for resin pipes (A) Side view and (B) Side sectional view showing the manufacturing process of a joint for resin pipes Side sectional view which shows the connection structure with the resin pipe of the joint for resin pipes concerning 3rd Embodiment (A) Side view of joint for resin pipes, (B) Viewed from the tip side (A) perspective view of joint for resin pipe, (B) perspective view seen from another direction (A) Side view and (B) Side sectional view showing the manufacturing process of a joint for resin pipes (A) Side view and (B) Side sectional view showing the manufacturing process of a joint for resin pipes (A) Side view and (B) Side sectional view showing the manufacturing process of a joint for resin pipes (A) Side view and (B) Side sectional view showing the manufacturing process of a joint for resin pipes 18A is a side view of the joint for resin pipes as viewed from the first radial direction, and FIG. 18B is a cross-sectional view taken along line AA. (A) Side view and (B) Side sectional view showing the manufacturing process of a joint for resin pipes 20A is a side view of the joint for resin pipes as viewed from the first radial direction, and FIG. (A) Cross-sectional view of large-diameter portion before first tip side inclined curved surface is formed, (B) Cross-sectional view of large-diameter portion after first tip-side inclined curved surface is formed. (A) Cross-sectional view of large-diameter portion before first base-side inclined curved surface is formed, (B) Cross-sectional view of large-diameter portion after first base-side inclined curved surface is formed. The side view which shows an example of the cyclic | annular ridge part which concerns on other embodiment. Side view of joint for resin pipe according to another embodiment

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, the joint structure 100 of the present embodiment includes a resin pipe joint 10, a resin pipe 50, and a fastening tool 51. The fastening tool 51 has an annular shape, and is composed of, for example, a hose clip.

  The resin pipe joint 10 has a cylindrical shape having a center hole 11, and has a device connection portion 12 on one end side in the axial direction and a core portion 15 having a smaller diameter than the device connection portion 12 on the other end side. The device connection unit 12 is connected to, for example, a piping device (not shown). The core portion 15 is inserted inside the resin tube 50. Then, the resin tube 50 is tightened from the outside with the fastening tool 51 in a state where the core portion 15 is inserted inside the resin tube 50, thereby sealing between the inner surface of the resin tube 50 and the resin tube joint 10. The In the following description, the core 15 side of the resin pipe joint 10 is appropriately referred to as a distal end side, and the device connecting portion 12 side is appropriately referred to as a proximal end side.

  At the distal end portion of the device connection portion 12, a flange portion 13 protruding outward is provided. A male screw portion 14 is formed on the outer peripheral surface of the device connection portion 12 at the base end side portion from the flange portion 13. The flange portion 13 is formed in a hexagonal shape so that the resin pipe joint 10 can be rotated by a jig such as a wrench when the device connection portion 12 is connected to a screw hole (not shown) of the piping device. ing.

  An annular tip protrusion 17 is formed on the outer peripheral surface of the tip of the core portion 15. In order to facilitate the insertion of the resin pipe joint 10 into the resin pipe 50, the tip protrusion 17 has a tapered shape that decreases in diameter toward the tip side of the core part 15.

  As shown in FIGS. 3, 4 </ b> A, and 4 </ b> B, the outermost surface of the core portion 15 is closed in the circumferential direction of the core portion 15 at a portion farthest from the central axis J <b> 1 of the core portion 15. An annular ridge portion 20 is formed. The annular ridge 20 has a larger diameter than the above-described tip protrusion 17, and contacts the inner surface of the resin pipe 50 over the entire circumferential direction when the resin pipe joint 10 is inserted into the resin pipe 50. (See FIG. 1). In other words, the annular ridge 20 is a portion that seals between the inner surface of the resin pipe 50 in the resin pipe joint 10.

  As shown in FIG. 3, the annular ridge portion 20 has a portion extending along the central axis J <b> 1 of the core portion 15, and two different positions in the circumferential direction of the annular ridge portion 20 are shifted in the axial direction of the core portion 15. It is configured as follows. Therefore, the portion where the annular ridge portion 20 spreads the resin tube 50 outwardly shifts in the axial direction of the resin tube 50.

  Specifically, as shown in FIG. 3, FIG. 4A and FIG. 4B, the annular ridge portion 20 is along an inclined surface K <b> 1 that is inclined obliquely with respect to the central axis J <b> 1 of the core portion 15. And is formed in an oval shape (specifically, the major axis of the ellipse is inclined obliquely with respect to the central axis J1 of the core portion 15) when viewed from the direction perpendicular to the inclined surface K1. Yes. Specifically, the annular ridge portion 20 is one side in the radial direction of the core portion 15 (as viewed from the short axis direction of the ellipse (the depth direction of the paper in FIG. 3)) toward the distal end side of the core portion 15 ( In FIG. 3, it is inclined toward the upper side. In the example of the present embodiment, the cross-sectional shape when the annular ridge 20 is cut in the circumferential direction is substantially semicircular, but other shapes such as a triangular shape and a trapezoidal shape may be used. Good.

  As shown in FIG. 1, the length of the annular ridge portion 20 in the direction of the central axis J1 of the core portion 15 is shorter than the length of the range in which the fastening tool 51 tightens the resin pipe 50 in the direction of the central axis J1. . In the joint structure 100 according to the present embodiment, the annular ridge portion 20 is arranged in a range in which the fastening tool 51 fastens the resin pipe 50 in the direction of the central axis J1 of the core portion 15.

  The description regarding the structure of the joint structure 100 which concerns on this embodiment is above. In addition, the joint 10 for resin pipes may be comprised with the metal, and may be comprised with resin. In the former case, the resin pipe joint 10 is manufactured, for example, by casting. In the latter case, the resin pipe joint 10 is manufactured, for example, by resin injection molding.

  Next, the effect of the joint structure 100 according to the present embodiment will be described. In the present embodiment, the annular ridge portion 20 formed on the outer peripheral surface of the core portion 15 of the resin pipe joint 10 has a portion extending along the central axis J1 of the core portion 15, and the annular ridge portion 20 in the circumferential direction thereof. Since the two different positions are configured to be shifted in the direction of the central axis J1 of the core portion 15, when the core portion 15 is inserted into the resin tube 50, the portion where the annular ridge portion 20 extends the resin tube 50 outward is The resin pipe 50 is displaced in the axial direction. Thereby, when the core part 15 is inserted in the resin pipe 50, the deformed portion of the resin pipe 50 does not concentrate in one place in the axial direction, and the core part 15 can be easily inserted into the resin pipe 50. It becomes possible. In addition, in this embodiment, since the cross-sectional shape of the annular ridge portion 20 is a semicircular shape, the resin pipe 50 can easily get over the annular ridge portion 20.

  In the present embodiment, the annular ridge portion 20 is arranged along the inclined surface K1 inclined obliquely with respect to the central axis J1 of the core portion 15, and is elliptical when viewed from a direction perpendicular to the inclined surface K1. Therefore, the deformed portion of the resin tube 50 is dispersed in the axial direction of the resin tube, and the insertion of the core portion 15 into the resin tube 50 can be further facilitated. Furthermore, since only one annular ridge portion 20 is provided on the outer peripheral surface of the core portion 15, the number of deformed portions of the resin tube 50 can be reduced, and the insertion of the core portion 15 into the resin tube 50 is possible. Can be made easier.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 5, the joint structure 100V of the present embodiment is a modification of the first embodiment, and the configuration of the resin pipe joint 10V is different from that of the first embodiment. As shown in the figure, also in the joint structure 100V of the present embodiment, the resin pipe 50 is tightened from the outside by the fastening tool 51 (see FIG. 6) in a state where the core portion 15 is inserted inside the resin pipe 50. By tightening, the space between the core portion 15 and the inner surface of the resin pipe 50 is sealed. Hereinafter, the joint for resin pipes 10V will be described in detail.

  The joint 10V for resin pipes of this embodiment is comprised with the metal. As shown in FIGS. 7A and 8B, in the resin pipe joint 10V, an annular groove 16 is formed on the outer peripheral surface of the distal end portion, and is arranged on the distal end side from the annular groove 16. The portion is a tip protrusion 17. Further, in the resin pipe joint 10V, as in the first embodiment, the annular ridge 20V formed on the outer peripheral surface of the core portion 15 (specifically, the outer peripheral surface of the base end side portion from the annular groove 16) is provided. The core portion 15 is disposed along an inclined surface K1 that is inclined with respect to the central axis J1, and is formed in an elliptical shape when viewed from a direction perpendicular to the inclined surface K1. Specifically, the annular ridge portion 20 </ b> V is inclined so as to go to one side in the radial direction of the core portion 15 as it goes to the distal end side of the core portion 15. Also in the present embodiment, the annular ridge 20V is arranged in a range in which the fastening tool 51 fastens the resin pipe 50 in the direction of the central axis J1 of the core 15.

  As shown in FIG. 7A and FIG. 8A, a first diameter that decreases toward the base end side of the core portion 15 is formed on the base end side of the annular ridge portion 20 </ b> V in the outer peripheral surface of the core portion 15. A first inclined curved surface 21 that is a part of the conical surface 31 (see FIG. 10B) is formed. Further, as shown in FIGS. 7A and 8B, the second diameter of the outer peripheral surface of the core portion 15 is reduced toward the distal end side of the core portion 15 on the distal end side of the annular ridge portion 20V. A second inclined curved surface 22 that is a part of the conical surface 32 (see FIG. 11B) is formed. An annular ridge portion 20 </ b> V is disposed at the boundary between the first inclined curved surface 21 and the second inclined curved surface 22.

  As shown in FIG. 10B, the first conical surface 31 is an outer peripheral surface of a cone centering on the first shaft 31J that is eccentric to the other side in the radial direction with respect to the central axis J1 of the core portion 15. Yes. In the example of the present embodiment, the amount of eccentricity ΔX1 of the first shaft 31J with respect to the central axis J1 is a reduced diameter by which the first conical surface 31 is reduced by the length of the first inclined curved surface 21 in the axial direction of the core portion 15. It is substantially the same as the amount ΔR1. As shown in FIG. 11B, the second conical surface 32 is an outer peripheral surface of a cone centering on the second shaft 32J that is eccentric to one side in the radial direction with respect to the central axis J1 of the core portion. ing. In the example of the present embodiment, the amount of eccentricity ΔX2 of the second shaft 32J with respect to the central axis J1 is the diameter of the second conical surface 32 that is reduced by the length of the second inclined curved surface 22 in the axial direction of the core portion 15. It is substantially the same as the amount ΔR2. In the present embodiment, the amount of eccentricity ΔX1 of the first shaft 31J relative to the central axis J1 and the amount of eccentricity ΔX2 of the second shaft 32J relative to the central axis J1 are the same size.

  Since the structure of the resin pipe joint 10 </ b> V excluding the core portion 15 is the same as that of the first embodiment, description thereof is omitted by attaching the same reference numerals. Next, the manufacturing method of the joint 10V for resin pipes is demonstrated.

  In order to manufacture the resin pipe joint 10V, first, as shown in FIGS. 9A and 9B, a pre-process joint 40 that is different from the resin pipe joint 10 only in the structure of the core portion 15 is prepared. Specifically, in the joint 40 before processing, the core portion 15 has a large-diameter portion 41 at an intermediate portion in the axial direction, and the annular groove 16 and the distal-end protrusion 17 are provided on the distal end side of the large-diameter portion 41. It is prepared side by side. The large-diameter portion 41 of the joint 40 before processing is the same diameter as the outer diameter of the annular ridge portion 20V when viewed from the axial direction of the core portion 15 in the resin pipe joint 10V or larger than the outer diameter of the annular ridge portion 20V. ing.

  When the pre-process joint 40 is prepared, as shown in FIG. 10B, the pre-process joint 40 is rotated around the first shaft 31J eccentric to the other side in the radial direction with respect to the central axis J1 of the core portion 15. Then, the cutting edge 42 is applied to the large diameter portion 41 from the outside in the radial direction to cut the outer peripheral portion of the large diameter portion 41. At this time, on the proximal end side with respect to the position closer to the distal end of the core portion 15, the distal end side with respect to the position closer to the distal end is set such that the distance from the first shaft 31J becomes shorter toward the proximal end side of the core portion 15. Then, by controlling the position of the cutting blade 42 so that the distance from the first shaft 31J becomes shorter toward the distal end side, the distal end of the cutting blade 42 is contracted on the proximal end side around the first shaft 31J. It arrange | positions so that the 1st conical surface 31 diameterd and the 1st front-end | tip conical surface 33 diameter-reduced by the front end side may be drawn. And the 1st inclined curved surface 21 which is a part of 1st cone surface 31 is formed in the part which faces the radial direction one side among the outer peripheral surfaces of the core part 15 (refer FIG. 10 (A)). In the example of the present embodiment, the amount of eccentricity ΔX1 of the first shaft 31J with respect to the central axis J1 of the core portion 15 is the length of the first inclined curved surface 21 in the axial direction of the core portion 15 and the first conical surface 31 has. Although it is substantially the same as the diameter reduction amount ΔR1 to reduce the diameter, if the amount of eccentricity ΔX1 is more than half of the diameter reduction amount ΔR1, only the portion of the outer peripheral surface of the large diameter portion 41 that faces one side in the radial direction One inclined curved surface 21 can be formed.

  Next, as shown in FIG. 11B, the large-diameter portion 41 is rotated while rotating the joint 40 before processing around the second shaft 32J that is eccentric to one side in the radial direction with respect to the central axis J1 of the core portion 15. The outer peripheral part of the large diameter part 41 (refer FIG. 10 (B)) is cut by applying the cutting blade 42 to the outer side in radial direction. At this time, by controlling the position of the cutting blade 42 so that the distance from the second shaft 32J becomes shorter toward the distal end side of the core portion 15, the distal end of the cutting blade 42 is centered on the second shaft 32J. It arrange | positions so that the 2nd conical surface 32 diameter-reduced by the side may be drawn. And the 2nd inclined curved surface 22 which is a part of 2nd conical surface 32 is formed in the part which faces the radial direction other side among the outer peripheral surfaces of the core part 15, and the 1st inclined curved surface 21 and the 2nd inclined curved surface 22 are formed. An annular ridge 20V is formed as a boundary line (see FIG. 11A). Thus, the resin pipe joint 10V shown in FIGS. 5 to 7 is completed. In the example of this embodiment, the amount of eccentricity ΔX2 of the second shaft 32 with respect to the central axis J1 of the core portion 15 is the length of the second inclined curved surface 22 in the axial direction of the core portion 15 and the second conical surface 32 has. The diameter is substantially the same as the diameter reduction amount ΔR2, but if the eccentricity amount ΔX2 is more than half of the diameter reduction amount ΔR2, only the portion of the outer peripheral surface of the large diameter portion 41 facing the other side in the radial direction is used. Two inclined curved surfaces 22 can be formed.

  This completes the description of the structure and manufacturing method of the resin pipe joint 10V. Next, the effect of the joint structure 100V according to the present embodiment will be described.

  According to the joint structure 100V of the present embodiment, the same effects as those of the first embodiment can be obtained. In addition, in the resin pipe joint 10 </ b> V of the present embodiment, the diameter of the outer peripheral surface of the core portion 15 is reduced toward the distal end side of the core portion 15 at a portion disposed on the distal end side with respect to the annular ridge portion 20 </ b> V. Since the second inclined curved surface 22 which is a part of the conical surface 32 is provided, when the core portion 15 is inserted into the resin tube 50 and the resin tube 50 gets over the annular ridge 20V, the second inclined curved surface 22 The resin tube 50 can be gradually expanded outward, and the core portion 15 can be easily inserted into the resin tube 50.

  Further, in the resin pipe joint 10 </ b> V according to the present embodiment, the annular ridge portion 20 </ b> V has an elliptical shape toward the one side in the radial direction of the core portion 15 toward the distal end side of the core portion 15. Of the outer peripheral surface, the portions arranged on the proximal end side and the distal end side with respect to the annular ridge portion 20V are a part of the first conical surface 31 whose diameter is reduced toward the proximal end side, and the diameter is reduced toward the distal end side. Therefore, the resin pipe joint 10V can be manufactured by cutting as shown in FIGS. 9 to 11.

[Third Embodiment]
Hereinafter, a third embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 12, the joint structure 100W of the present embodiment is a modification of the first embodiment, and the configuration of the resin pipe joint 10W is different from that of the first embodiment. As shown in the figure, also in the joint structure 100W of the present embodiment, the core portion 15 is tightened with the clip 51 from the outside in a state where the core portion 15 is inserted inside the resin tube 50, whereby the core portion 15 and the inner surface of the resin pipe 50 are sealed. Hereinafter, the core portion 15 of the resin pipe joint 10 </ b> W will be described in detail.

  The joint 10W for resin pipes of this embodiment is comprised with the metal. As shown in FIGS. 13 (A) and 13 (B), also in the resin pipe joint 10W of the present embodiment, the annular groove 16 is formed on the outer peripheral surface of the distal end portion of the core portion 15 as in the second embodiment. A portion on the tip side from the annular groove 16 is a tip protrusion 17. In the resin pipe joint 10 </ b> W, the annular ridge portion 20 </ b> W formed on the outer peripheral surface of the core portion 15 is inclined obliquely with respect to the central axis J <b> 1 of the core portion 15, as in the first and second embodiments. It arrange | positions along the inclined surface K1, and it goes to the one side of the radial direction of the core part 15 as it goes to the front end side of the core part 15, and is formed in the ellipse shape seeing from the direction perpendicular | vertical to the inclined surface K1. In the present embodiment, the annular ridge portion 20 </ b> W is formed in a strip shape having a substantially constant width in the axial direction of the core portion 15. In the following description, the direction in which the annular ridge portion 20W is inclined with respect to the central axis J1 in the radial direction of the core portion 15 is defined as the first radial direction X and the minor axis direction of the annular ridge portion 20W (that is, the core portion 15 Of the radial directions, the direction perpendicular to the first radial direction X) will be referred to as the second radial direction Y.

  As shown in FIGS. 13 (A) and 14 (A), the first end edge 20WA facing the one side in the first radial direction X of the annular ridge portion 20W has a pair of first tip side curved portion 25 and a first pair. It is formed of one base end side curved portion 26, 26. Specifically, a portion of the outer peripheral surface of the core portion 15 that is disposed on one side in the first radial direction X with respect to the annular ridge portion 20W has a first distal-end-side conical surface that decreases in diameter toward the proximal end side. A pair of first proximal-side inclined curved surfaces 36A, which are a part of a first distal-side inclined curved surface 35A that is a part of 35 and a first proximal-side conical surface 36 that is also reduced in diameter toward the proximal side. 36A (see FIG. 21A). In FIG. 13A and FIG. 14A, only one first base-side inclined curved surface 36A is shown). The first distal-side inclined curved surface 35A is disposed closer to the distal end side of the core portion 15 than the pair of first proximal-side inclined curved surfaces 36A, 36A. Then, the first tip that is the edge of the first tip side inclined curved surface 35A on the annular ridge portion 20W side by the intersecting line between the first tip side conical surface 35 and the first plane H1 substantially parallel to the inclined surface K1 described above. A side curve portion 25 is formed, and a pair of first edges that are the edges of the first base-side inclined curved surface 36A on the annular ridge portion 20W side by the line of intersection of the first base-side conical surface 36 and the first plane H1. 1 base end side curve parts 26 and 26 are formed. Each first base-side curved portion 26 is disposed on an extension line of the first tip-side curved portion 25, and the first tip-side curved portion 25 and the pair of first base-side curved portions 26, 26 are connected to each other. ing. And the 1st end which faces the one side of the 1st radial direction X among annular ridges 20W by the 1st tip side curve part 25 and a pair of 1st base end side curve parts 26 and 26 which continued. An edge 20WA is formed. The first plane H1 is inclined so that the distal end side of the core portion 15 is disposed on one side in the first radial direction X.

  Further, as shown in FIGS. 13A and 14B, the second end edge 20WB facing the other side in the first radial direction X of the annular ridge portion 20W includes the second base end side curved portions 27 and 1. A pair of second tip side curved portions 28 and 28 are formed. Specifically, the second base-end-side conical surface that decreases in diameter toward the distal end side is disposed on a portion of the outer peripheral surface of the core portion 15 that is disposed on the other side in the first radial direction X with respect to the annular ridge portion 20W. A pair of second distal-side inclined curved surfaces 38A, 38A (part of a second proximal-side inclined curved surface 37A, which is a part of 37, and a second distal-side conical surface 38 that is also reduced in diameter toward the distal end side). 21A. In FIG. 13A and FIG. 14B, only one second tip side inclined curved surface 38A is shown. The second base-side inclined curved surface 37A is disposed closer to the base end side of the core portion 15 than the pair of second tip-side inclined curved surfaces 38A, 38A. The second base end side conical surface 37 and the second plane H2 that is substantially parallel to the inclined surface K1 described above are the edges of the second base end side inclined curved surface 37A on the annular ridge 20W side. A second base-side curved portion 27 is formed, and a pair of edges that are the edges of the second tip-side inclined curved surface 38A on the annular ridge portion 20W side by the line of intersection between the second tip-side conical surface 38 and the second plane H2. Second tip side curved portions 28, 28 are formed. Each second distal-side curved portion 28 is disposed on an extension line of the second proximal-side curved portion 27, and the second proximal-side curved portion 27 and the pair of second distal-side curved portions 28, 28 are connected. ing. And the 2nd end which faces the other side of the 1st diameter direction X among annular ridges 20W by the 2nd base end side curve part 27 and a pair of 2nd tip side curve parts 28 and 28 which continued. An edge 20WB is formed. The second plane H2 is substantially parallel to the first plane H1, and is disposed on the distal end side of the core portion 15 with respect to the first plane H1.

  Since the structure of the resin pipe joint 10 </ b> W excluding the core portion 15 is the same as that of the first and second embodiments, description thereof is omitted by attaching the same reference numerals. Next, the manufacturing method of the joint 10W for resin pipes is demonstrated.

  In order to manufacture the resin pipe joint 10W, first, as shown in FIGS. 15A and 15B, a pre-process joint 40W having only the structure of the core portion 15 different from the resin pipe joint 10W is prepared. Specifically, in the joint 40W before processing, the core portion 15 has a large-diameter portion 41 at an intermediate portion in the axial direction, and the annular groove 16 and the tip protrusion 17 are provided on the distal end side of the large-diameter portion 41. It is prepared side by side. The large diameter portion 41 of the joint 40W before processing is the same diameter as the outer diameter of the annular ridge portion 20W when viewed from the axial direction of the core portion 15 in the resin pipe joint 10W or larger than the outer diameter of the annular ridge portion 20W. It has become.

  When the pre-process joint 40W is prepared, as shown in FIG. 16B, the pre-process joint is centered on the first shaft 35J eccentric to the other side in the first radial direction X with respect to the central axis J1 of the core portion 15. While rotating 40W, the cutting blade 42 is applied to the large diameter portion 41 from the outside in the radial direction, and the outer peripheral portion of the large diameter portion 41 is cut. At this time, in the portion on the distal end side from the first intermediate position L1 located in the middle in the axial direction in the large diameter portion 41, the cutting blade is set so that the distance from the first shaft 35J becomes shorter toward the proximal end side. By controlling the position of 42, the tip of the cutting blade 42 is arranged so as to draw a first tip side conical surface 35 whose diameter is reduced on the base end side with the first shaft 35J as the center. Further, in the portion on the base end side from the first intermediate position L1, the distance from the first shaft 35J of the cutting blade 42 is the same as the distance from the first shaft 35J of the cutting blade 42 at the first intermediate position L1. Thus, the position of the cutting blade 42 is controlled. A first tip-side inclined curved surface 35A, which is a part of the first tip-side conical surface 35, is formed on a portion of the outer peripheral surface of the large-diameter portion 41 facing one side in the first radial direction X (FIG. 16). (See (A)). Here, in the example of the present embodiment, the amount of eccentricity ΔX1 of the first shaft 35J with respect to the central axis J1 of the core portion 15 is equal to the length of the first tip-side inclined curved surface 35A in the axial direction of the core portion 15. The side conical surface 35 is substantially the same as the diameter reduction amount ΔR1 that reduces the diameter, but if the eccentric amount ΔX1 is more than half of the diameter reduction amount ΔR1, the first radial direction X of the outer peripheral surface of the large diameter portion 41 is increased. It is possible to form the first tip side inclined curved surface 35A only on one side. 22A and 22B show a cross section of the large-diameter portion 41 before and after the formation of the first tip side inclined curved surface 35A.

  Next, as shown in FIG. 17 (B), while rotating the joint 40W before processing around the second shaft 37J eccentric to one side in the first radial direction X with respect to the central axis J1 of the core portion 15, A cutting blade 42 is applied to the diameter portion 41 from the outside in the radial direction to cut the outer peripheral portion of the large diameter portion 41. At this time, in the portion on the base end side with respect to the first intermediate position L1 in the large diameter portion 41 with respect to the first intermediate position L1, the distance from the second shaft 37J becomes shorter toward the front end side. By controlling the position of the cutting blade 42 as described above, the distal end of the cutting blade 42 is disposed so as to draw the second proximal end-side conical surface 37 with the second axis 37J as the center. Further, in the portion on the tip side from the second intermediate position L2, the distance from the second shaft 37J of the cutting blade 42 is the same as the distance from the second shaft 37J of the cutting blade 42 at the second intermediate position L2. Thus, the position of the cutting blade 42 is controlled. Then, a second base-side inclined curved surface 37 </ b> A that is a part of the second base-side conical surface 37 is formed on a portion of the outer peripheral surface of the large-diameter portion 41 facing the other side in the first radial direction X ( (See FIG. 17A). The second base-side inclined curved surface 37A and the first distal-side inclined curved surface 35A described above overlap between the first intermediate position L1 and the second intermediate position L2 in the axial direction of the large diameter portion 41. Here, in the example of the present embodiment, the amount of eccentricity ΔX2 of the second shaft 37J with respect to the central axis J1 of the core portion 15 is equal to the length of the second proximal-side inclined curved surface 37A in the axial direction of the core portion. Although it is substantially the same as the diameter reduction amount ΔR2 that the end-side conical surface 37 is reduced in diameter, if the eccentric amount ΔX2 is more than half of the diameter reduction amount ΔR2, the first radial direction of the outer peripheral surface of the large diameter portion 41 The second base-side inclined curved surface 37A can be formed only on the other side of X.

  Next, as shown in FIG. 18 (B), while rotating the pre-working joint 40W around the second intermediate shaft 38J eccentric to the central axis J1 side of the core portion 15 with respect to the second shaft 37J, the large diameter portion The outer peripheral part of the large diameter part 41 is cut by applying the cutting blade 42 to 41 from the outer side in the radial direction. At this time, by controlling the position of the cutting blade 42 so that the distance from the second intermediate shaft 38J becomes shorter toward the distal end side in the portion on the distal end side than the second intermediate position L2 in the large diameter portion 41, The tip of the cutting blade 42 is disposed so as to draw a second tip side conical surface 38 centered on the second intermediate shaft 38J. Then, a pair of second tip-side inclined curved surfaces 38A and 38A formed by a part of the second tip-side conical surface 38 are formed in a portion of the outer peripheral surface of the core portion 15 facing in the second radial direction Y. (See FIGS. 19A and 19B).

  Here, as shown in FIGS. 18A and 19A, the pair of second distal-side inclined curved surfaces 38A, 38A are formed in the circumferential direction of the core portion 15 into the second proximal-side inclined curved surface 37A. It arrange | positions so that it may slip | deviate with respect to. Further, the edge on one side in the first radial direction X of the second base-side inclined curved surface 37 </ b> A and the pair of second distal-side inclined curved surfaces 38 </ b> A and 38 </ b> A are both oblique with respect to the central axis J <b> 1 of the core portion 15. 2nd base end side curved surface 27 that is an intersection line of the second base end side inclined curved surface 37A and the second plane H2, the second front end side inclined curved surface 38A and the second The second tip side curved portion 28 that is a line of intersection with the two planes H2 is connected.

  Next, as shown in FIG. 20 (B), while rotating the joint 40W before processing around the first intermediate shaft 36J eccentric to the central shaft J1 side of the core portion 15 with respect to the first shaft 35J, the large diameter portion The outer peripheral part of the large diameter part 41 is cut by applying the cutting blade 42 to 41 from the outside in the radial direction. At this time, the position of the cutting blade 42 is controlled so that the distance from the first intermediate shaft 36J becomes shorter toward the base end side in the portion on the base end side from the first intermediate position L1 in the large diameter portion 41. Thus, the distal end of the cutting blade 42 is disposed so as to draw the first proximal-side conical surface 36 centered on the first intermediate shaft 37J. A pair of first base-side inclined curved surfaces 36 </ b> A and 36 </ b> A configured by a part of the first base-side conical surface 36 is formed on a portion of the outer peripheral surface of the core portion 15 facing in the second radial direction Y. It is formed (see FIGS. 21A and 21B). 23A and 23B show a cross section of the large-diameter portion 41 before and after the formation of the pair of first base-side inclined curved surfaces 36A and 36A.

  Here, as shown in FIG. 20A and FIG. 21A, the pair of first proximal-side inclined curved surfaces 36A, 36A is formed in the circumferential direction of the core portion 15 with the first distal-end inclined curved surface 35A. It arrange | positions so that it may slip | deviate with respect to. In addition, the first distal-side inclined curved surface 35 </ b> A and the pair of first proximal-side inclined curved surfaces 36 </ b> A and 36 </ b> A are both inclined with respect to the central axis J <b> 1 of the core portion 15. Are arranged on a first plane H1 that intersects the first front-side inclined curved surface 35A and the first plane H1, and the first distal-side curved surface 25 and the first proximal-side inclined curved surface 36A and the first The first base end side curved portion 26 that is a line of intersection with the plane H1 is connected. And among the outer peripheral parts of the core part 15, the 1st front end side curve part 25 and a pair of 1st base end side curve parts 26 and 26, the 2nd base end side curve part 27, and a pair of 2nd front end side An annular ridge portion 20 </ b> W is formed at a portion sandwiched between the curved portions 28, 28. Thus, the resin pipe joint 10 </ b> W shown in FIGS. 12 to 14 is completed.

  This completes the description of the structure and the manufacturing method of the resin pipe joint 10W. Next, the function and effect of the joint structure 100W will be described.

  In the joint structure 100W of the present embodiment, the same effects as those of the first embodiment can be achieved. In addition, in the resin pipe joint 10 </ b> W, a portion of the outer peripheral surface of the core portion 15 that is disposed on the distal end side with respect to the annular ridge portion 20 </ b> W has a second distal-end-side cone that decreases in diameter toward the distal end side of the core portion 15. Since the second distal end-side inclined curved surface 38A that is a part of the surface 38 and the second proximal-side inclined curved surface 37A that is a part of the second proximal-side conical surface 37 are provided, When 15 is inserted and the resin tube 50 gets over the annular ridge 20W, the resin tube 50 can be gradually expanded outward by the second distal-side inclined curved surface 38A and the second proximal-side inclined curved surface 37A. Insertion of the core portion 15 into the resin tube 50 is facilitated. Furthermore, since the annular ridge portion 20W has a strip shape having a substantially constant width in the axial direction of the core portion 15, the seal with the resin pipe 50 is stabilized.

  Further, in the resin pipe joint 10W according to the present embodiment, the first end-side conical surface 35 and the core portion of the annular ridge portion 20W whose first end edge 20WA facing the base end side is reduced in diameter toward the base end side. The first distal-side curved portion 25 which is a part of the line of intersection with the first plane H1 intersecting the 15 central axis J1, the first proximal-side conical surface 36 which decreases in diameter toward the proximal end, and the first The pair of first base end side curved portions 26 and 26 which are a part of the line of intersection with the plane H1 are formed in a continuous manner. A second end edge 20WB facing the distal end side of the annular ridge portion 20W is formed by a second base end side conical surface 37 that is reduced in diameter toward the distal end side and a second plane H2 that intersects the central axis J1 of the core portion 15. The second base end side curved portion 27 constituted by a part of the intersection line, and the part of the intersection line between the second distal end side conical surface 38 and the second plane H2 whose diameter decreases toward the distal end side. The pair of second tip side curved portions 28, 28 are formed in a continuous manner. According to such a configuration of the resin pipe joint 10 </ b> W, as described with reference to FIGS. 15 to 21, the resin pipe joint 10 </ b> W can be manufactured by cutting.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various modifications are possible within the scope of the invention other than the following. It can be changed and implemented.

  (1) In the above embodiment, the resin pipe joints 10, 10 V, and 10 W are separate from the fastening tool 51 that fastens the resin pipe 50, but the fastening tool 51 is integrated as a so-called quick joint. The structure with which it prepares may be sufficient.

  (2) In the manufacturing method of the resin pipe joints 10V and 10W shown in the second and third embodiments, the annular groove 16 and the tip protrusion 17 are formed before the formation of the annular ridges 20V and 20W. However, it may be formed after the formation of the annular ridges 20V and 20W.

  (3) In the second and third embodiments, the example in which the resin pipe joints 10 </ b> V and 10 </ b> W are manufactured by cutting is shown, but they may be manufactured by casting.

  (4) In the above embodiment, the length of the annular ridges 20, 20 </ b> V, 20 </ b> W in the axial direction of the core portion 15 is slightly shorter than the axial length of the portion where the resin pipe 50 is fastened by the fastening tool 51. However, it may be equal to or less than the axial length of the portion to be tightened, and may be the same length as the axial length or half or less.

  (5) In the above embodiment, only one annular ridge 20, 20 </ b> V, 20 </ b> W is provided within the range in which the fastener 51 tightens the resin pipe 50, but a plurality of annular ridges 20, 20 </ b> V, 20 </ b> W may be provided.

  (6) In the said embodiment, the site | part extended along the central axis J1 of the core part 15 is formed over the whole circumferential direction of the annular ridge parts 20, 20V, 20W in the annular ridge parts 20, 20V, 20W. However, it may be formed only in a part of the circumferential direction. An example is shown in FIGS. 24 (A) to (C).

  (7) In the above embodiment, the resin pipe joints 10, 10V, and 10W have a straight shape, but as shown in FIG. 25 (A), they may be L-shaped, or FIG. As shown in FIG. FIG. 25A shows an example in which the core portions 15 are formed at both ends of the L-shape and the annular ridge portions 20 are formed in each core portion 15. Any annular ridge portion among the portions 20, 20V, and 20W may be formed. Moreover, in the example of the same figure, the core part 15 may be formed only in one end part of the L-shape, and any one of the annular ridge parts 20, 20V, 20W may be formed in the core part 15. . FIG. 25B shows an example in which the core portion 15 is formed in all three branch pipe portions in the T-shape, and the annular ridge portion 20 is formed in each core portion 15. Any one of the annular ridges 20, 20 </ b> V, and 20 </ b> W may be formed in the portion 15. Moreover, in the example of the figure, the core part 15 is formed in any one or two branch pipe parts among three branch pipe parts, and any one of the annular ridge parts 20, 20V, 20W is formed in the core part 15. Such an annular ridge may be formed.

10, 10V, 10W Resin pipe joint 15 Core part 20, 20V, 20W Annular peak part 50 Resin pipe 51 Fastening tool 100, 100V, 100W Joint structure

Claims (3)

A joint structure in which a cylindrical core portion provided in a joint is inserted into a resin tube, and the resin tube is tightened from the outside with an annular fastener to seal between the resin tube and the core portion. There,
On the outer peripheral surface of the core portion, at least one annular ridge portion formed by closing a portion farthest from the central axis of the core portion in the circumferential direction is formed,
The annular ridge portion has a portion extending along the central axis of the core portion, and is configured such that two different positions in the circumferential direction of the annular ridge portion are shifted in the central axis direction of the core portion,
A joint structure in which all the annular ridge portions are arranged so as to be within a range in which the fastening tool fastens the resin pipe in the central axis direction of the core portion.   The said annular ridge part is arrange | positioned along the inclined surface inclined with respect to the central axis of the said core part, and is formed in the ellipse shape seeing from the direction perpendicular | vertical to the said inclined surface. Joint structure.   The joint structure according to claim 1 or 2, wherein only one annular ridge portion is formed on an outer peripheral surface of the core portion.