JP2005233350A - Structure of resin pipe connector, and resin pipe connecting method using resin pipe connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide structure of a resin pipe connector capable of surely connecting resin pipes with simple work, and to provide a resin pipe connecting method using the same. <P>SOLUTION: In the condition wherein an inner cylindrical body 29 is inserted into a downstream end 13a of the resin pipe 13, the downstream end 13a of the resin pipe is inserted into a connector main body 23 from an upstream side of the connector main body 23. A claw part 24a of a ring member 24 provided in the inner peripheral surface of the connector main body 23 bites the peripheral surface of the resin pipe 13 to connect the resin pipe 13. In the structure of the resin pipe connector with this structure, the inner cylindrical body 29 is arranged inside the connector main body 23 before connecting, and a protection cap 33 for preventing loss of the inner cylindrical body 29 is provided upstream of the connector main body 23. A measurement part for providing a marker 40 as a rough standard of insert length of the resin pipe is provided in the protection cap 33. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a joint structure for resin pipes and a resin pipe connection method using the joint for resin pipes.

  The present applicant inserts the downstream end of the resin pipe into the joint body from the upstream side of the joint body with the inner cylinder inserted in the downstream end of the resin pipe, and the claw part of the ring is connected to the resin pipe. As a joint structure for a resin pipe configured so that a resin pipe is connected by biting into the outer peripheral surface, as shown in Patent Document 1 below, a joint composed of a joint body, an inner cylinder, and a bush is proposed. ing. That is, as shown in FIGS. 8 and 9, the joint body 71 of the resin pipe joint 70 has an internal thread 72 at the upstream end, for example, upstream of the stop cock body located upstream of the faucet in the bathroom. The other end has a female screw 73 screwed into a male screw (not shown) formed on the other end. The bush 74 has a small-diameter portion 76 in which a male screw 75 to be engaged with the female screw 72 is formed, and a large-diameter portion 77 that is continuous with the small-diameter portion 76, and an annular claw portion 78 that is continuously provided at the tip of the small-diameter portion 76. Have The inner cylindrical body 79 includes a cylindrical portion 79a and an outward flange (a flange portion) 79b formed at one end of the cylindrical portion 79a. A surface A of the flange 79b opposite to the cylindrical portion side is a joint body. An inner cylindrical body 79 is disposed in the joint body 71 from the upstream side of the joint body 71 so as to contact the inward annular surface B of the projecting portion 80 formed on the inner periphery of 71.

In order to connect the resin pipe 81 to the resin pipe joint 70, first, the inner cylinder 79 is fitted into the resin pipe 81 from the cylinder portion 79a side, and then the joint body 71 and the bush 74 in the temporarily fixed state are attached. The resin pipe 81 is externally fitted. At this time, the resin pipe 81 is inserted into the joint body 71 until the surface A of the inner cylindrical body 79 abuts on the surface B of the joint body 71. When the bush 74 is rotated and screwed into the joint main body 71 in this state, first, the claw portion 78 comes into contact with the protruding portion 82 formed on the inner periphery of the joint main body 71, and further the bush 74 is rotated. Then, since the claw portion 78 is easily deformed by the plurality of notches 83 formed in the claw portion 78, the claw portion 78 is pressed radially inward by the protruding portion 82. Thereby, the annular claw 84 that has slid on the outer peripheral surface 81 a of the resin pipe 81 bites into the outer peripheral surface 81 a of the resin pipe 81, and the joint body 71 and the bush 74 and the resin pipe 81 are firmly connected. It will be.
JP 2002-147680 A

  However, it is necessary to perform an external fitting operation to the resin pipe 81 and a tightening operation by rotating the bush 74, which may require a lot of work.

  The present invention has been made in consideration of the above-mentioned matters, and an object of the present invention is to provide a resin pipe joint structure capable of reliably connecting a resin pipe by a simple operation and a resin pipe connection method using the resin pipe joint. It is to be.

  In order to achieve the above object, the present invention inserts the downstream end portion of the resin pipe into the joint body from the upstream side of the joint body in a state where the inner cylindrical body is inserted into the downstream end portion of the resin pipe. In the joint structure for resin pipes, in which the claw portion of the ring member provided on the inner peripheral surface of the main body bites into the outer peripheral surface of the resin pipe, the resin pipe is connected. A protective cap that is placed inside the body and prevents the inner cylinder from being lost is provided upstream of the joint body. The portion is provided on the protective cap.

  Further, according to the present invention, the downstream end portion of the resin pipe is inserted into the joint body from the upstream side of the joint body of the joint for resin pipe in a state where the inner cylindrical body of the joint for resin pipe is inserted into the downstream end portion of the resin pipe. In the resin pipe connection method in which the resin pipe joint and the resin pipe are connected by inserting and inserting the claw portion of the ring member provided on the inner peripheral surface of the joint body into the outer peripheral surface of the resin pipe. Remove the protective cap provided at the upstream part of the joint body from the joint body to prevent the inner cylinder body located inside the joint body from being lost, take out the inner cylinder body from the protective cap, and use the inspection unit. A marker serving as a guide for the length of the resin pipe is applied to the downstream end of the resin pipe, and the marker is placed on the end face of the upstream portion of the joint body with the taken-out inner cylinder inserted into the downstream end of the resin pipe. position The plastic pipe to provide a resin pipe connection method using the resin pipe fittings, characterized in that inserted into the fitting body until the.

  The joint structure for resin pipes of this invention has a joint body, a ring member provided on the inner peripheral surface of the joint body, and an inner cylinder body inserted into the downstream end of the resin pipe. The body is placed in the joint body, and a protective cap that prevents the inner cylinder from being lost is installed in the upstream part of the joint body, and a test is performed to apply a marker that indicates the length of the resin pipe insertion to the resin pipe. Since the part is provided on the protective cap, the work to be performed at the time of construction is the work of removing the protective cap from the joint body, the work of taking out the inner cylinder from the joint body, and the resin pipe using the inspection unit. The work of applying a marker that serves as a guide for the length of the resin pipe to be inserted into the downstream end, and the work of inserting the resin pipe into the joint body until the marker is located at the end face of the upstream part of the joint body. Work and tightening The plastic pipe can be reliably connected by simple operation as compared with the work.

  In the present invention, since the resin pipe insertion hole of the joint body is covered with the protective cap from the factory shipment to the construction site, dust and other dust can be prevented from entering the resin pipe insertion hole. . That is, in this invention, dust such as dust adheres to a seal member such as an O-ring provided in the joint main body, and this causes water to leak outside from the water passing portion in the joint main body after construction. Can be prevented. In this case, the inner cylinder is set to an appropriate length so that the open end surface of the inner cylinder disposed in the joint body on the side opposite to the protective cap contacts the inner peripheral portion on the downstream side of the joint body. This is preferable in that dust and other dust can be prevented from entering from the downstream side of the resin pipe insertion hole.

  Also, in the resin pipe connection method using the resin pipe joint of the present invention, at the time of construction, the operation of taking out the inner cylindrical body from the protective cap, and the length of the resin pipe inserted into the downstream end of the resin pipe using the inspection unit It is only necessary to perform the work of applying a marker that is a guideline of the length and the work of inserting the resin pipe into the joint body until the marker is located at the end face of the upstream part of the joint body. In comparison, the resin pipe can be securely connected with simpler work.

Embodiments of the present invention will be described below.
FIGS. 1-5 shows 1st Embodiment of this invention used for the sheath pipe construction method of a water supply / hot-water supply piping system, for example.

  First, the water supply / hot water supply piping system will be briefly described. In FIG. 6, 1 is a hot water supply pipe, 2 is a water supply pipe, and the hot water supply pipe 1 includes a hot water supply pipe header 4 provided on the downstream side of the hot water supply main pipe 3 drawn indoors, for example, a washroom The stop cock main body 7 of the stop cock 6 for hot water located in the upstream of the hot-water mixing stopper 5 is connected. The water supply pipe 2 connects a water supply pipe header 9 provided on the downstream side of the water supply main pipe 8 drawn indoors and a water stopcock body 11 of the water stopcock 10. Reference numeral 12 denotes a hot water supply facility. The water stop cock 10 and the hot water stop cock 6 have the same structure.

  The hot water supply pipe 1 and the water supply pipe 2 are, for example, a resin pipe 13 of a polybutene pipe for water supply or a crosslinked polyethylene pipe for water supply being guided and protected by a sheath pipe 14 on the piping path, Both are fixed at appropriate positions by fixing means 15 such as a band. The upstream end 13 a of the water resin pipe 13 is connected to the header 9 by a connecting member 16. Similarly, the upstream end 13 b of the hot water resin pipe 13 is connected to the header 4 by a connecting member 18. Reference numeral 19 denotes a flexible hot water introduction pipe which connects the hot water mixing tap 5 and the stop cock 6. Reference numeral 20 denotes a flexible water introduction pipe that connects the hot-water mixing tap 5 and the water stop cock 10.

Next, the joint for resin pipes will be described.
1 to 5, reference numeral 21 denotes a resin pipe joint that is screwed to the upstream side of the stop cock main body 11 (or the stop cock main body 7), and has a resin pipe insertion hole 22 as a through hole. It is mainly composed of a cylindrical joint body 23, a pair of ring members 24, 24 provided on the inner peripheral surface of the joint body 23, and a cylindrical inner cylinder 29 inserted into the downstream end portion of the resin pipe 13.

  The joint body 23 includes a body portion 25, an annular body 26 provided on the upstream end surface portion 25 a of the body portion 25 in a state where the ring member 24 is fitted, and a male screw 25 b formed on the upstream side of the body portion 25. It consists of a substantially cylindrical bush 27 having a female screw 27a to be screwed together. The pair of ring members 24 are provided on the inner peripheral surface of the annular body 26 so as to sandwich the ring body 28. Each ring member 24 has an annular claw 24a that slightly protrudes radially inward from the inner peripheral surface. The inner cylindrical body 29 has a cylindrical portion 29a and an outward flange (a flange portion) 29b formed at one end of the cylindrical portion 29a. A surface S on the opposite side of the cylindrical portion 29a side of the flange 29b. Is inserted into the downstream end portion of the resin pipe 13 in the resin pipe insertion hole 22 so as to contact the inward annular surface G of the annular projecting portion 30 formed on the downstream side on the inner periphery of the main body portion 25. Thus, the inner cylinder 29 is arranged. Reference numerals 31 and 31 denote a pair of O-rings provided in a region formed on the inner circumference of the main body 25 and upstream of the protrusion 30.

Next, a characteristic configuration of the present invention will be described.
33 is a resin protective cap for covering the bush 27 constituting the upstream portion of the joint body, and prevents the inner cylinder 29 from being lost while the resin pipe joint 21 is brought from the factory to the construction site. Is to do. The protective cap 33 has a shape corresponding to the outer shape of the bush 27. That is, the protective cap 33 is an umbrella-like, circular shape in plan view, a horizontal top surface portion 34, an inclined surface portion 35 continuously provided in a downwardly inclined manner from the periphery of the top surface portion 34, and the inclined surface portion 35. It consists of a drooping bottom surface portion 36 continuously provided in a state of drooping downward from the lower peripheral edge. The top surface portion 34 has a bottomed tube portion 37 that extends downward from the center to the vicinity of the boundary between the inclined surface portion 35 and the suspended surface portion 36, and a bottomed tube that extends below the lower end of the suspended surface portion 36 in a state where it is suspended from the periphery. A cylindrical inner cylinder holding portion 38 is provided. That is, the bottomed cylinder part 37 and the inner cylinder holding part 38 are in a concentric relationship, the bottomed cylinder part 37 is located inside the inner cylinder holding part 38, and the inner cylinder holding part 38 and the bottomed cylinder The inner cylinder until the flange 29b side of the cylindrical body 29 faces the opening 38a at the lower end of the inner cylindrical body holding portion 38 in the annular space 39 formed between the inner surface 37 and the rear surface of the top surface 34. The body 29 is inserted. Therefore, the inner cylinder 29 can be held without being lost while the resin pipe joint 21 is brought from the factory shipment to the construction site. That is, the bottomed cylindrical portion 37 is inserted into the inner cylindrical body 29, and the flange 29 b reaches the back surface of the top surface portion 34 while the peripheral surface of the flange 29 b slides on the inner peripheral surface of the inner cylindrical body holding portion 38. Thus, the resin-made inner cylinder holding portion 38 is elastically deformed, and the flange 29b is held in the inner cylinder holding portion 38 by this elastic deformation. An inner diameter of the inner cylinder holding portion 38 is substantially equal to an outer diameter of the resin pipe 13. The inner cylindrical body holding portion 38 has a pair of notches 40 and 40 in the opening 38 a and an axial direction (a direction) cut 41 formed from the notch 40 to the back surface of the top surface portion 34. This is for making it easy to remove the inner cylinder 29 held by the inner cylinder holding part 38 from the inner cylinder holding part 38 as shown in FIGS. That is, in the resin pipe joint 21 transported to the construction site, since the inner cylinder body 29 is held by the inner cylinder body holding portion 38, the joint body 23 is held in the state held by the inner cylinder body holding portion 38. The protective cap 33 can be removed, and then the inner cylinder body 29 is taken out from the inner cylinder body holding section 38 by grasping the cylinder section 29a of the inner cylinder body 29. The inner cylinder body holding section 38 has a notch 40. By being formed, the cylindrical portion 29a can be easily grasped, and by providing the cut line 41, the inner cylindrical body holding portion 38 is easily elastically deformed, and the gripped inner cylindrical body 29 is held in the inner cylindrical body holding portion. 38 can be easily removed.

  Further, in the resin pipe 13 in which the inner cylinder body 29 is securely inserted into the downstream end portion 13a, in order to confirm the insertion amount L of the resin pipe 13 into the resin pipe insertion hole 22, the inner cylinder holding section The length K in the a direction of 38 is set to the same length as the insertion amount L. That is, as shown in FIGS. 3 and 4, when the downstream end portion 13 a of the resin pipe 13 is fitted into the inner cylindrical body holding portion 38 until reaching the back surface of the top surface portion 34, the opening end surface of the inner cylindrical body holding portion 38. A marker 40 is drawn with a pen or the like at the position of the downstream end 13a corresponding to m. Subsequently, when the inner cylindrical body 29 is inserted to the specified position of the downstream end portion 13 a of the resin pipe 13 and the resin pipe 13 is inserted into the resin pipe insertion hole 22, the position of the marker 40 and the upstream end face F of the bush 27. It is possible to confirm that the insertion of the resin pipe 13 into the normal position is completed by visually confirming that the two match. As described above, the inner cylindrical body holding portion 38 also serves as a measurement portion for applying the marker 40 serving as a guide for the resin pipe insertion length to the resin pipe 13.

FIG. 7 shows a second embodiment of the present invention. In FIG. 7, the same reference numerals used in FIGS. 1 to 6 are the same or equivalent.
In FIG. 7, the difference between this embodiment and the above embodiment is that the outer shape of the protective cap 33 ′ is different from the outer shape of the protective cap 33 used in the above embodiment.
That is, the protective cap 33 ′ is a resin protective cap that covers the upstream end face F of the bush 27 and the resin pipe insertion hole 22 constituting the upstream portion of the joint body, and the resin pipe joint 21 is installed at the construction site from the time of factory shipment. This is to prevent the inner cylinder 29 from being lost during The protective cap 33 ′ has a horizontal top surface portion 34 ′ that is circular in plan view. The top surface portion 34 ′ has a bottomed cylindrical portion 37 that extends downward from the center, and a bottomed cylindrical inner cylinder holding portion 38 that extends downward from the bottomed cylindrical portion 37 in a state of hanging from the periphery. In this embodiment, there is an advantage that the protective cap 33 ′ can be molded with a lower amount of resin than the amount of resin used in the protective cap 33.

BRIEF DESCRIPTION OF THE DRAWINGS It is structure explanatory drawing which shows 1st Embodiment of this invention. It is a disassembled perspective view which shows the said embodiment. It is a disassembled perspective view which shows the use condition in the said embodiment. In the said embodiment, it is a structure explanatory drawing which shows the operation | movement when the marker used as the standard of resin pipe insertion length is given to a resin pipe. In the said embodiment, it is a structure explanatory drawing which shows the completion of insertion to the regular position of a resin pipe. It is a perspective view which shows the water supply / hot-water supply piping system to which the said embodiment is applied. It is composition explanatory drawing which shows 2nd Embodiment of this invention. It is structure explanatory drawing which shows a prior art example. It is a disassembled perspective view which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 13 Resin pipe 13a Downstream end part 23 Joint main body 24 Ring member 24a Claw part 29 Inner cylinder 33 Protection cap 38 Inner cylinder holding part (inspection part)
40 markers

Claims (2)

  With the inner cylinder inserted in the downstream end of the resin pipe, the downstream end of the resin pipe is inserted into the joint body from the upstream side of the joint body, and the claw of the ring member provided on the inner peripheral surface of the joint body In the joint structure for a resin pipe configured so that the resin pipe is connected by the portion biting into the outer peripheral surface of the resin pipe, the inner cylinder is disposed in the joint body before the connection, and the inner cylinder A protective cap is provided in the upstream part of the joint body to prevent loss of the pipe, and a measuring part for providing a marker for the resin pipe insertion length on the resin pipe is provided on the protective cap. Joint structure for resin pipes. With the inner pipe of the resin pipe joint inserted into the downstream end of the resin pipe, the downstream end of the resin pipe is inserted into the joint body from the upstream side of the joint body of the resin pipe joint. In the resin pipe connection method in which the joint for the resin pipe and the resin pipe are connected by the claw portion of the ring member provided on the inner peripheral surface biting into the outer peripheral surface of the resin pipe, it is arranged in the joint body before the connection. Remove the protective cap provided in the upstream part of the joint body from the joint body to prevent the inner cylinder from being lost, take out the inner cylinder from the protective cap, and further use the inspection part to the downstream end of the resin pipe. The resin pipe is provided with a marker for the insertion length of the resin pipe, and the removed inner cylinder is inserted into the downstream end of the resin pipe until the marker is positioned at the end face of the upstream portion of the joint body. Plastic pipe connection method using the resin pipe fittings, characterized in that inserted into the joint body.

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