JP4579039B2 - Connection structure of resin pipe and joint - Google Patents

Description

  The present invention relates to a connection structure between a resin pipe and a joint.

  At the time of plumbing for water supply and hot water supply, draw the water supply main pipe and the hot water supply main pipe from the hot water supply equipment indoors, and connect the water supply main pipe and the hot water supply main pipe to the water supply pipe header and the hot water supply pipe header, As water supply pipes and hot water supply pipes connecting each of these headers to, for example, each stopcock located upstream of the hot-water mixer tap in the bathroom, they are resistant to heat, such as crosslinked polyethylene or polybutene, and are not easily deformed and rust. It is used by inserting a resin pipe with excellent durability such as no piercing through a bellows-like sheath tube, so that in the case of water leakage etc., the sheath tube is left as it is and both ends of the resin pipe are used. It is convenient in that the resin pipe can be taken out from the inside of the sheath tube and replaced by simply releasing the connection.

  By the way, as a joint for resin pipes, as shown in FIG. 7 and FIG. 8, there is a conventional joint composed of a joint body 71, a cap nut 72, and a split ring 73. The connection procedure of the resin pipe P is as follows.

(1) First, in order to confirm the insertion amount L of the resin pipe P into the joint body 71, a mark 74 is drawn with a pen or the like at a position separated from the end surface a of the resin pipe P by the insertion amount L [Fig. 7 (A)].
(2) The cap nut 72 and the split ring 73 are once removed from the joint body 71 of the joint assembled at the time of factory shipment, and these are inserted into the resin pipe P in the order of the cap nut 72 and the split ring 73 [Fig. 7 (B)].
(3) The resin pipe P is securely inserted all the way into the joint body 71 (see FIG. 7C).
(4) The split ring 73 is pressed until it hits the joint body 71, and it is confirmed that the positions of the split ring 73 and the mark 74 are matched (see FIG. 8A).
(5) The cap nut 72 is fastened to the joint body 71 until the tip of the split ring 73 protrudes about 1 mm from the cap nut end portion 72a [see FIG. 8B]. In this case, the cap nut 72 is tightened using a tool, but it is necessary to turn the cap nut 72 about three times so that the split ring 73 does not come off the resin pipe P.
(6) After tightening, a mark 75 is drawn on the cap nut 72 and the joint body 71 (see FIG. 8C).
JP 2004-11698 A

  However, in the above conventional connection structure between the resin pipe and the joint, the mark 74 is put on the resin pipe P, the bag nut 72 and the split ring 73 are once removed from the joint body 71 before the resin pipe P is inserted, or the removed bag. It is necessary to insert the nut 72 and the split ring 73 into the resin pipe P again, or to tighten the cap nut 72 in accordance with the protruding amount of the tip of the split ring 73, so that the pipe connection work cannot always be performed quickly.

  In addition, as a connection structure different from the above, after inserting the inner cylinder member, which is a member different from the joint body, into the resin pipe, the resin pipe is set in the joint body in which the outer cylinder portion is formed in this state, There is a type in which a resin pipe is inserted into an annular groove formed by an outer cylinder part and an inner cylinder member. In this case, the number of work steps before insertion of the resin pipe is reduced compared to the above pipe connection work. It was necessary to perform the work of plugging into the pipe.

  The present invention has been made in consideration of the above-described matters, and an object of the present invention is to provide a connection structure between a resin pipe and a joint that can eliminate the need for a joint assembly operation before inserting the resin pipe.

In order to achieve the above object, the connection structure of the resin pipe and the joint according to the present invention is such that the resin pipe is inserted inside the outer cylinder portion provided on one end side of the cylindrical joint body, and the resin pipe When a cap nut is screwed onto the male screw of the outer cylinder portion with a cylindrical inner cylinder disposed inside, a ring body with a claw that sandwiches a resin pipe with the inner cylinder biases the cap nut. And the claw is configured to bite into the resin pipe, and a part of the indicator accommodated in the through hole provided in the outer cylinder part is formed inside the outer cylinder part. A resin pipe-joint connection structure configured to be pushed out of the through hole by the inserted resin pipe, wherein the indicator has a cylindrical center formed with a protrusion that contacts the through hole wall And one end side of this central part The tip of the resin pipe inserted inside the outer cylinder, provided on the other end side of the central part, and a truncated cone-shaped tapered part that can contact the tip of the resin pipe inserted inside the outer cylinder And a substantially hemispherical head that is pushed out of the through hole by abutment between the portion and the tapered portion, and has a fluorescent material on the surface (Claim 1).

From another point of view , the connection structure between the resin pipe and the joint according to the present invention is such that when the resin pipe is inserted inside the outer cylinder portion provided on one end side of the cylindrical joint main body, The slide ring arranged inside the part slides and a part of the indicator accommodated in the through hole provided in the outer cylinder part is pushed out of the through hole by the slide ring, while the outer ring The clawed ring body arranged inside the cap nut screwed to the male screw of the cylinder part is in a state of sandwiching the resin pipe with the cylindrical inner cylinder body arranged inside the resin pipe, and the claw A connecting structure of a resin pipe and a joint configured such that the claw of the attached ring body bites into the resin pipe, wherein the indicator has a cylindrical central portion formed with a protrusion that contacts the through hole wall, One end of the center Provided in the outer cylinder portion, the tip portion of the resin pipe inserted inside the outer cylinder portion can be contacted with the truncated cone-shaped taper portion, provided on the other end side of the central portion, and inserted inside the outer cylinder portion with almost and a hemispherical head which is pushed out of the through hole and the distal end portion side of the plastic pipe by contact with the tapered portion, that are characterized by having a fluorescent material on the surface (claim 2) .

  In the invention which concerns on Claim 1 and 2, the connection structure of the resin pipe and joint which can make the joint assembly operation | work before resin pipe insertion unnecessary is obtained. Moreover, in this connection structure, since the indicator is provided with the protrusion, there is no possibility that the indicator will unexpectedly fall from the through hole. Furthermore, by providing a fluorescent material on the surface of the indicator, it is easy to grasp the position of the indicator in the dark, the state of the joint body, and the like.

  FIG. 1 is an exploded perspective view schematically showing a configuration of a resin pipe-joint connection structure (hereinafter referred to as a connection structure) 1 according to the first embodiment of the present invention, and FIGS. 2 (A) and 2 (B). These are explanatory drawings which show roughly the structure of the said connection structure 1 after insertion of the resin pipe 8 and before insertion. 1 and 2 (A) and 2 (B), reference numeral 2 denotes a joint main body, for example, a flow rate adjusting member (not shown) connected to communicate with an inlet of a water faucet (not shown) located downstream. Not connected).

  The joint body 2 has a cylindrical (substantially cylindrical) male threaded portion 3 as a connecting portion at the downstream end, and an inner portion extending from the downstream end side toward the upstream end side inside the male threaded portion 3. While having the cylindrical body 4, it has the outer cylinder part 5 extended in the upstream end side toward the upstream end side from the external thread part 3, and has an external thread on the outer peripheral surface of this external cylindrical part 5. 5a. In addition, the said external thread part 3 is comprised so that the internal thread formed in the upstream end part of the said flow volume adjustment member may be screwed together.

  Moreover, the site | part vicinity of the boundary with the said external thread part 3 in the outer cylinder part 5 is formed as the hexagonal part 6 whose outer surface is substantially a regular hexagonal column shape. An annular groove 7 is formed between the inner cylinder 4 and the outer cylinder part 5 including the hexagonal part 6.

  1 and 2 (A) and 2 (B), 8 is a resin pipe inserted into the annular groove 7, which is excellent in heat resistance such as crosslinked polyethylene or polybutene, hardly deformed, and does not rust. Made of durable material. The resin pipe 8 includes, for example, a water supply pipe and hot water supply connected to a water and hot water flow rate adjusting mechanism and a water and hot water flow rate adjusting mechanism located upstream of the hot and cold water mixing tap in the bathroom, respectively. Used as a tube. And the external thread part 3 of the said coupling main body 1 is connected in communication with the inlet_port | entrance of each said flow volume adjustment mechanism.

  In FIG. 1 and FIGS. 2A and 2B, 9 is a ring body made of a split ring with claws 10, which is made of, for example, stainless steel and is disposed outside the resin pipe 8. Tapered surface portions 9 a and 9 b are provided on one end side and the other end side of the outer peripheral surface of the ring body 9. The claw 10 is formed in an annular shape at two locations on the inner peripheral surface of the ring body 9.

  1 and 2 (A) and 2 (B), reference numeral 11 denotes a cap nut that is screwed onto the male screw 5a of the outer cylinder portion 3 so as to cover the ring body 9, and the outer cylinder portion 5 in order from the downstream side. The internal thread portion 12 is provided with a female thread portion 12 in which a female screw to be engaged with the male thread 5 a is formed, and a small diameter portion 13 having an inner diameter smaller than the inner diameter of the female thread portion 12.

  1 and 2A and 2B, reference numeral 14 denotes an O-ring that is detachably fitted in an annular groove 15 provided in the inner cylinder 4.

  1 and 2A and 2B, reference numeral 16 denotes a split ring that is detachably mounted between the male screw 5a and the hexagonal portion 6 in the outer cylindrical portion 5.

  1 and 2 (A) and 2 (B), reference numeral 17 denotes an indicator accommodated in a through hole 18 provided in the outer cylinder portion 5, and the indicator 17 is shown in FIGS. 3 (A) and 3 (B). A front view and a side view are shown. The through hole 18 is provided so that the annular groove 7 communicates with the space outside the hexagonal portion 6. The indicator 17 is formed of a material obtained by mixing a fluorescent material with a soft resin such as rubber, for example, and fits into the through hole 18 as shown in FIGS. 3 (A) and 3 (B). A cylindrical central portion 19 having a size, a tapered portion 20 provided on one end side of the central portion 19, and a substantially hemispherical head portion 21 provided on the other end side are provided. Further, the central portion 19 of the indicator 17 is provided with a projection 22 that contacts the through-hole wall that forms the through-hole 18, and this projection 22 is provided near the other end of the central portion 19. The annular protrusion 22a and a plurality (four in this embodiment) of linear protrusions 22b extending from the annular protrusion 22a toward one end of the central portion 19 are configured.

  As shown in FIG. 2B, the connection structure 1 having the above configuration is in a state where the resin pipe 8 is not inserted into the annular groove 7 at the time of factory shipment. At this time, the indicator 17 is , It does not protrude outside the through hole 18 and is contained inside the through hole 18. The indicator 17 is reliably prevented from coming out of the through hole 18 by friction between the protrusion 22 and the through hole wall that forms the through hole 18 provided in the central portion 19 of the indicator 17.

  At the construction site, as shown in FIG. 2A, the resin pipe 8 is inserted into the annular groove 7 inside the outer cylinder portion 5 and the inner cylinder body 4 is arranged inside the resin pipe 8. In this state, the cap nut 11 is screwed onto the male screw 5a of the outer cylinder portion 5, and the ring nut 9 is reduced in diameter by the cap nut 11 being tightened (biased) by the screw nut. Specifically, as shown in FIG. 2A, a tapered portion 23 that abuts the tapered surface portion 9a of the ring body 9 is provided at the tip of the outer cylinder portion 5, and a tapered portion of the ring body 9 is provided at one end of the cap nut 11. A tapered portion 24 that abuts against the surface portion 9b is provided. Accordingly, with the screwing of the cap nut 11, the ring nut 9 made of the split ring is fastened by the cap nut 11 and the outer cylinder portion 5, and the ring body 9 is deformed so that the diameter is reduced. And the nail | claw 10 of the ring body 9 bites into the resin pipe 8 with this clamping | tightening, Thereby, the connection of the resin pipe 8 and the coupling main body 2 is completed.

  Here, when the resin pipe 8 is inserted into the annular groove 7, if the insertion of the resin pipe 8 becomes shallow, the connection between the resin pipe 8 and the joint body 2 may be poor, but the indicator 17 may be used. Such inconvenience does not occur. That is, when the resin pipe 8 is inserted to an appropriate depth in the annular groove 7, the indicator 17 is brought into contact with the tip of the resin pipe 8 inserted into the annular groove 7. ), A part thereof is configured to be pushed out of the through hole 18. Therefore, by using the push-out of the indicator 17 as a clue, it is possible to reliably prevent the insertion of the resin pipe 8 from becoming shallow. Further, since the indicator 17 includes a fluorescent material and can be visually recognized even in a dark place, the position of the indicator 17 and the state of the joint body 2 can be easily grasped even in a dark place.

  In the above embodiment, the fluorescent material is mixed with the resin constituting the indicator 17. However, instead of such a configuration, for example, the fluorescent material may be applied to the surface of the resin constituting the indicator 17. Good. That is, the indicator 17 only needs to have a fluorescent material on the surface.

  Moreover, in the said embodiment, although the indicator 17 is made into the integral type, when the said head 21, the center part 19, and the taper part 20 are isolate | separated and the resin pipe 8 is inserted in the annular groove 7, for example, The head 21 may be configured to jump out of the through hole 18 and fall. In this case, it is preferable to provide a protrusion on the outer peripheral surface of the head 21 that contacts the through-hole wall that forms the through-hole 18.

  Furthermore, in the said embodiment, although the inner cylinder 4 is integrally formed with the joint main body 2, the inner cylinder 4 is good also as a different body from the joint main body 2. FIG.

  4 and 5 are longitudinal sectional views schematically showing configurations before and after insertion of the resin pipe 8 of the connection structure 25 according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the same or equivalent member as what was shown in the said embodiment, and the description is abbreviate | omitted.

  The connection structure 25 according to the second embodiment is a type in which the resin pipe 8 is connected to the joint body 2 with one touch. More specifically, as shown in FIGS. 4 and 5, when the resin pipe 8 is inserted inside the outer cylinder portion 5 provided on one end side of the joint body 2, the connection structure 25 is connected to the outer side as shown in FIGS. A slide ring 26 arranged in advance inside the cylindrical portion 5 slides toward the back side (lower side in FIGS. 4 and 5), and one indicator 17 accommodated in the through hole 18 of the outer cylindrical portion 5 is provided. The ring body 28 with a claw 27 disposed on the inner side of the cap nut 11 screwed to the male screw 5a of the outer cylinder portion 5 is pushed out of the through-hole 18 by the slide ring 26. 8 is configured such that the resin pipe 8 is sandwiched between the cylindrical inner cylinder 29 disposed inside the ring 8, and the claw 27 of the ring body 28 bites into the resin pipe 8.

  Here, the slide ring 26 has a small-diameter portion 26a and a large-diameter portion 26b in order from the tip (lower end) side, and an annular groove portion 26c is provided outside the large-diameter portion 26b. An O-ring 26d as a seal member is accommodated in 26c. The slide ring 26 is attached to the inside of the cap nut 11.

  In addition, the ring body 28 is formed by rolling a rectangular metal (for example, stainless steel) thin plate having claws 27 formed by punching many places into a ring shape so that the claws 27 protrude inward. This is a molded split ring body.

  Further, the inner cylinder 29 is formed with an outward flange 29 a at the tip (lower end), and the flange 29 a is in contact with the upper end of the slide ring 26 and is placed in the outer cylinder portion 5 and the cap nut 11. Contained.

  And in the connection structure 25 which consists of said structure, as shown in FIG. 4, if the resin pipe 8 is inserted between the cap nut 11 and the inner cylinder 29, eventually, as shown in FIG. Of the inner cylinder 29 comes into contact with the outward flange 29 of the inner cylinder 29. Thereafter, when the resin pipe 8 is further entered, the resin pipe 8 is pushed by the outward flange 29a of the inner cylindrical body 29, and the slide ring 26 slides downstream (downward) along the inner side of the outer cylindrical portion 5. .

  Then, the large-diameter portion 26 b of the slide ring 26 slid and abuts against the indicator 17, and a part of the indicator 17 accommodated in the through hole 18 is pushed out of the through hole 18 by the slide ring 26. Thus, by inserting the resin pipe 8 until the indicator 17 is pushed out, it is possible to reliably prevent the insertion of the resin pipe 8 from being shallow. The connection with the joint body 2 is completed. That is, when the above insertion is performed, the ring body 28 with the claw 27 disposed on the inner side of the cap nut 11 screwed to the male screw 5 a of the outer cylinder portion 5 is formed into a cylindrical shape disposed on the inner side of the resin pipe 8. The resin pipe 8 is sandwiched between the inner cylindrical body 29 and the claw of the ring body 28 with the claw 27 bites into the resin pipe 8.

  Further, in a state where the connection between the resin pipe 8 and the joint body 2 is completed, the O-ring 26 d provided on the slide ring 26 is in close contact with the inner wall of the outer cylinder part 5 and is provided on the inner wall of the outer cylinder part 5. Since the O-ring 30 as a seal member contacts the small diameter portion 26 a of the slide ring 26, the fluid flowing in the resin pipe 8 is also reliably prevented from leaking from the through hole 18 provided in the outer cylinder portion 5.

  Here, in this embodiment, the inner cylindrical body 29 may not be stored in the outer cylindrical portion 5 and the cap nut 11 in advance, but may be mounted on the tip of the resin pipe 8 in advance. The cylindrical body 29 and the slide ring 26 may be provided integrally without being separated.

  Furthermore, in the first and second embodiments, the ring body 9 with the claw 10 or the ring body 28 with the claw 27 is provided directly inside the cap nut 11. However, the present invention is not limited to such a configuration. For example, FIG. You may comprise as shown in. That is, in FIG. 6, 31 is a cylindrical annular body and has the inward flange part 32 in the front end side. And the annular body 31 is the outer cylinder part 5 of the coupling main body 2 in the state which the ring body 34 with the two claws 33 which consist of a split ring, and the spacer ring 35 pinched | interposed between these two ring bodies 34 are engage | inserted. It is attached to. In addition, the said ring body 34 has the nail | claw 33 formed inward and rearward (downward in FIG. 6) continuously in the circumferential direction. Further, by providing the spacer ring 35 between the two ring bodies 34, the claw 33 of each ring body 34 has a structure that can easily bite into the resin pipe 8.

It is a disassembled perspective view which shows roughly the structure of the connection structure of the resin pipe and joint which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows roughly the structure of the said connection structure after insertion of a resin pipe and before insertion. It is the front view and side view which show roughly the structure of the indicator in the said embodiment. It is a longitudinal cross-sectional view which shows schematically the structure before insertion of the resin pipe of the connection structure of the resin pipe and joint which concerns on 2nd Embodiment of this invention. It is a longitudinal cross-sectional view which shows schematically the structure after insertion of the resin pipe of the connection structure of the resin pipe and joint which concerns on the said 2nd Embodiment. It is explanatory drawing which shows roughly the structure of the modification of the connection structure of the resin pipe and joint which concerns on the said 1st and 2nd embodiment. (A)-(C) are explanatory drawings which show the first half of the connection procedure of the conventional joint for resin pipes. (A)-(C) are explanatory drawings which show the latter half of the connection procedure of the conventional joint for resin pipes.

DESCRIPTION OF SYMBOLS 1 Connection structure 2 Joint main body 4 Inner cylinder 5 Outer cylinder part 5a Male screw 8 Resin pipe 9 Ring body 10 Claw 11 Cap nut 17 Indicator 18 Through-hole 22 Protrusion part

Claims (2)

In the state where the resin pipe is inserted inside the outer cylinder part provided on one end side of the cylindrical joint main body and the cylindrical inner cylinder body is arranged inside the resin pipe, the external thread of the outer cylinder part When the cap nut is screwed to the ring, the ring body with a claw that sandwiches the resin pipe with the inner cylinder body is urged by the cap nut and deformed to reduce the diameter, and the claw bites into the resin pipe. Further, a resin configured such that a part of the indicator accommodated in the through hole provided in the outer cylinder part is pushed out of the through hole by the resin pipe inserted inside the outer cylinder part. A pipe-to-joint connection structure, wherein the indicator is provided on a cylindrical central portion formed with a protrusion that contacts the through-hole wall and on one end side of the central portion, and is inserted inside the outer cylinder portion Frustoconical shape with which the tip of the molded resin pipe can abut A substantially hemispherical head which is provided on the other end side of the taper portion and the central portion and is pushed out of the through hole by contact between the tip portion of the resin pipe inserted inside the outer cylinder portion and the taper portion. with and a part, the connection structure of the plastic pipe and fittings, characterized in that it comprises a fluorescent material on the surface. When a resin pipe is inserted inside the outer cylinder part provided on one end side of the cylindrical joint body, a slide ring arranged inside the outer cylinder part slides along with the insertion, and the outer cylinder part A part of the indicator accommodated in the through-hole provided in the claw is pushed out to the outside of the through-hole by the slide ring, while the claw arranged inside the cap nut screwed to the external thread of the outer cylinder part A resin pipe configured so that the claw of the ring body with the claw sandwiches the resin pipe with a cylindrical inner cylinder disposed inside the resin pipe, and the claw of the claw ring with the claw bites into the resin pipe; A joint connection structure, wherein the indicator is provided on a cylindrical central portion formed with a protrusion that contacts the through-hole wall and on one end side of the central portion, and is inserted inside the outer cylinder portion Resin pipe tip side A frustoconical tapered portion that can abut, and the outside of the through-hole by the abutment of the tapered portion provided on the other end side of the central portion and the distal end side of the resin pipe inserted inside the outer cylinder portion A resin pipe-joint connection structure comprising a substantially hemispherical head extruded on the surface and a fluorescent material on the surface.

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