JPH07293778A - Method for joining thermoplastic resin bent pipe joint to thermoplastic resin pipe - Google Patents

Abstract

PURPOSE:To provide an economical thermoplastic resin pipe joint limited only to one kind thereof by providing both so-called thermoplastic resin pipe joint for a socket welding and thermoplastic resin pipe joint for a so-called butt welding. CONSTITUTION:In a thermoplastic resin bent pipe joint 1 provided on both ends with faucets, at least one of the faucets 11 is provided on the mounting root part with a straight pipe part 12, so that a socket can be welded to the end of another thermoplastic pipe in the faucet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic resin curved pipe joint and a method for joining the thermoplastic resin curved pipe joint and a thermoplastic resin pipe.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Laid-Open No. 4-344223.
As described in Japanese Patent Laid-Open Publication No. JP-A No. 2003-163242, a thermoplastic resin for so-called socket welding in which the end portions of other thermoplastic resin pipes are inserted into one end of a pipe joint and heat-welded to each other to join the two. Resin fittings are known. On the other hand, there is known a so-called butt welding thermoplastic resin pipe joint in which another thermoplastic resin pipe is abutted against one end of the thermoplastic resin pipe joint, and both are heat-welded and joined to each other.

[0003]

However, conventionally, there are two types of thermoplastic resin pipe joints, that is, a so-called socket welded socket provided with a socket and a so-called butt welded thermoplastic resin pipe joint not provided with a socket. It was kind of expensive and uneconomical.

The present invention has been made by paying attention to the problems in the conventional thermoplastic resin pipe joint,
The purpose is to solve the conventional problems and to provide a single type of thermoplastic resin pipe joint by combining a so-called socket welding thermoplastic resin pipe joint and a so-called butt welding thermoplastic resin pipe joint. An object is to provide an economical thermoplastic resin pipe joint.

[0005]

In order to achieve the above object, the thermoplastic resin curved pipe joint of the present invention according to claim 1 is a thermoplastic resin curved pipe joint having receiving ends at both ends. A straight pipe portion is provided at the base portion of at least one of the receiving ports.

According to a second aspect of the present invention, there is provided a thermoplastic resin curved pipe joint according to the first aspect of the present invention, wherein in the thermoplastic resin curved pipe joint, a straight pipe portion is provided at a base portion and a straight pipe portion is provided. It is characterized in that it is detachably attached to.

Further, in the method for connecting a thermoplastic resin pipe according to a third aspect of the present invention, the thermoplastic resin bent pipe joint according to the first aspect is cut in the vicinity of the boundary between the straight pipe portion and the receiving port of the base of the receiving port. Then
It is characterized in that the cut portion tube mouth and the end portion of another thermoplastic resin tube are butted and welded to each other.

According to a fourth aspect of the present invention, there is provided a method for connecting a thermoplastic resin pipe, wherein the receiving end of the thermoplastic resin bent pipe joint according to the second aspect is removed from the straight pipe portion, and the straight pipe portion and other heat are connected. It is characterized in that the ends of the plastic resin pipes are butted and welded together.

In the present invention as set forth in claims 1 to 4, the material of both the thermoplastic resin bent pipe joint and the thermoplastic resin pipe is not particularly limited, but for example, hard vinyl chloride resin, polyethylene, polypropylene, nylon, Thermoplastic resins such as polyacetal and polyphenylene sulfide can be used.

In the present invention according to claims 3 and 4,
Thermoplastic resin Pipe part of the bent joint of the base part of the mouth of the mouth of the joint, the cut part mouth that cut the boundary part between the mouth and the mouth, or the straight pipe part mouth with the mouth removed and other thermoplastic resin pipes The means for heating and melting the end of the is not particularly limited, for example, means for applying the end of the cutting portion tube opening and the thermoplastic resin tube to the heated stainless steel hot plate, or A means for applying a flame of an acetylene gas burner to the joining end portion of the thermoplastic resin tube can be used.

[0011]

In the present invention according to claim 1, since a straight pipe portion is provided at the base of at least one of the receiving ports, the receiving port is the end of another thermoplastic resin pipe, a so-called socket. It is possible to weld, and when so-called butt welding is performed with the end of another thermoplastic resin pipe, cutting caused by cutting near the boundary between the straight pipe part of the base of the receiving port and the receiving port So-called butt welding can be performed between the partial pipe opening and the end of the other plastic resin pipe.

According to the second aspect of the present invention, since the receptacle having the straight pipe portion provided at the base portion is detachably attached to the straight pipe portion, the end of another thermoplastic resin pipe is formed. In the case of so-called butt welding with a pipe portion, the pipe opening of the straight pipe portion and the end portion of another plastic resin pipe can be so-called butt welding by removing the receiving port.

Therefore, according to the curved pipe joint of the present invention as defined in claims 1 and 2, so-called socket welding and so-called butt welding can be performed by one curved pipe joint, which is economical.

Further, in the method for connecting a thermoplastic resin pipe according to a third aspect, the vicinity of the boundary between the straight pipe portion and the receiving port at the base of the receiving port of the thermoplastic resin bent pipe joint according to the first aspect is connected. Since it is cut and the cut-off pipe mouth and the end of another thermoplastic resin pipe are butted and welded together, the straight pipe portion of the bent pipe joint and the end portion of another thermoplastic resin pipe are clamped. By gripping, it is possible to firmly perform so-called butt welding joining.

Further, in the method of connecting a thermoplastic resin pipe according to a fourth aspect, the receiving port of the thermoplastic resin bent pipe joint according to the second aspect is removed from the straight pipe portion, and this straight pipe portion pipe opening and another Since the end of the thermoplastic resin pipe is butt-welded and joined together, the so-called butt welding joint can be firmly formed by gripping the straight pipe part of the bent pipe joint and the end part of another thermoplastic resin pipe with a clamp. It is possible.

Embodiments of the present invention will now be described with reference to the drawings. [Embodiment 1: Embodiment of the invention described in claim 1] FIG. 1 is a sectional view showing an example of a bent pipe fitting of a thermoplastic resin according to the present invention. In FIG. 1, reference numeral 1 denotes a polyethylene bent pipe joint according to the present invention, which is provided at both ends with a diameter-increasing receiving port 11, and a straight pipe portion 12 is provided at a base portion of the receiving port 11.

[Mode of Use and Action of First Embodiment: Embodiment of the Invention According to Claim 3] Next, the action of the bent pipe joint 1 of the present invention shown in FIG. 1 will be described with reference to FIGS. In order to insert another polyethylene pipe into the socket 11 of the bent pipe joint 1 of the present invention and perform so-called socket welding, the inner surface of the socket 11 and the outer surface of the end of the polyethylene pipe are heated and melted, and the outer surface of the end of the polyethylene pipe is fixed. So-called socket welding is possible by inserting into the inner surface of the receiving port 11.

In so-called butt welding, first, as shown in FIG. 2, cutting is performed in the vicinity 13 of the boundary between the one receiving port 11 and the straight pipe portion 12 of the bending pipe joint 1 of the present invention, and the cutting occurs. A hot plate (not shown) made of stainless steel heated to a melting point of polyethylene or higher is applied to the cut portion tube mouth to heat and melt, and the end of another polyethylene pipe 2 is also made of a stainless steel. It is heated and melted by (not shown).

Next, as shown in FIG. 3, the cut portion of the bent pipe joint 1 heated and melted and the other polyethylene pipe 2
Butt together with the end of. By attaching clamps to the ends of the straight pipe portion 12 of the bent pipe joint 1 and the polyethylene pipe 2 which are butted in this manner and maintaining the butted state of the two for a while, the butted welding of the two is completed and the two are joined. Therefore, in the bent pipe joint of the present invention, the polyethylene pipe can be joined by so-called socket welding or so-called butt welding.

[Embodiment 2: Embodiment of the invention described in claim 2] FIG. 4 is a cross-sectional view showing a main part of another example of the thermoplastic resin bent pipe joint of the present invention. In the thermoplastic resin curved pipe joint 1a of the present invention shown in FIG. 4, a straight pipe portion 12a is provided at one end of a polyethylene curved pipe joint body 10.
A male screw 14 is engraved on the outer surface of the straight pipe portion 12a, and a female screw 16 of a polyethylene short pipe 15 is screwed into the male screw 14 to form a receiving port 11a in the straight pipe portion 12a. Reference numeral 17 is a rubber seal ring fitted in a groove formed in the inner surface of the short tube 15.

[Use Mode and Operation of Embodiment 2] Embodiment of the Invention According to Claim 4 Next, the use mode and operation of the thermoplastic resin curved pipe joint of the present invention shown in FIG. 4 will be described. In order to insert another polyethylene pipe (not shown) into the receiving port 11a of the bent pipe joint 1a of the present invention, so-called socket welding, the inner surface of the receiving port 11a and the outer surface of the end portion of the polyethylene pipe are heated and melted to form the end portion of the polyethylene pipe. So-called socket welding is possible by inserting the outer surface into the inner surface of the receiving port 11a.

In so-called butt welding, the short pipe 15 of the bent pipe joint 1a of the present invention is removed, and a stainless steel hot plate (not shown) heated to a melting point of polyethylene or higher at the pipe opening of the straight pipe portion 12a. ) To heat and melt,
Similarly, the ends of the other polyethylene tubes are heated and melted by a stainless steel hot plate (not shown).

Next, the bent pipe joint 1a which is heated and melted
The pipe mouth of the straight pipe portion 12a and the end portion of another polyethylene pipe are butted and joined together. By attaching a clamp to the straight pipe portion 12a of the bent pipe joint 1a and the end portion of the polyethylene pipe thus abutted to each other and maintaining the abutted state of the both for a while, the abutting welding of the both is completed and the two are joined. Therefore, in the bent pipe joint 1a of the present invention, the polyethylene pipe can be joined by so-called socket welding or so-called butt welding.

[Embodiment 3: Embodiment of the invention described in claim 2] FIG. 5 is a sectional view showing a main part of still another example of the bent pipe joint for thermoplastic resin of the present invention. In the thermoplastic resin curved pipe joint 1b of the present invention shown in FIG. 5, a straight pipe portion 12b is provided at one end of a polyethylene bent pipe joint body 10b, and a flange 14b is provided on the outer surface of the straight pipe portion 12b. The flange 16b of the polyethylene short pipe 15b is superposed on 14b, and is joined by the bolt nut 18 to form the straight pipe portion 1 of the pipe joint body 10b.
A receptacle 11b is formed on 2b.

FIG. 6 is a sectional view showing a main part of still another example of the bent pipe for thermoplastic resin of the present invention. In the thermoplastic resin bent pipe joint 1c of the present invention shown in FIG. 6, the straight pipe portion 12 is provided at one end of the polyethylene bent pipe joint body 10c.
c is provided, and a flange 14c is projectingly provided on the outer surface of the straight pipe portion 12c, and the polyethylene short pipe 1 is provided on the flange 14c.
The flange 16c of 5c is overlapped, and the flange 14c
To the external thread 141c engraved on the outer surface of the union nut 1
By screwing 8c, a receiving port 11c is formed in the straight pipe portion 12c of the pipe joint body 10c.

The embodiments of the present invention have been described above with reference to the drawings. However, the specific configuration of the present invention is not limited to the illustrated embodiments, and design changes that do not depart from the gist of the present invention can be applied to the present invention. included.

For example, as in the illustrated embodiment, instead of providing the receiving ports at both ends of the curved pipe joint, the receiving ports may be provided only at one end of the curved pipe coupling.

[0027]

According to the first aspect of the present invention, the socket can be so-called socket welded with the end of the other thermoplastic resin tube, and the end of the other thermoplastic resin tube can be connected with the socket. In the case of so-called butt welding, the so-called butt welding is performed between the cut pipe opening and the end of another plastic resin pipe, which is created by cutting the vicinity of the boundary between the straight pipe portion of the base of the receiving opening and the receiving opening. be able to.

Further, in the present invention as set forth in claim 2, in the case of so-called butt welding with the end portion of another thermoplastic resin pipe, the pipe port of the straight pipe portion and another plastic resin are removed by removing the receiving port. So-called butt welding can be performed on the ends of the pipe.

Therefore, according to the bending pipe joint of the present invention as defined in claims 1 and 2, so-called socket welding and so-called butt welding can be performed with one bending pipe joint, which is economical.

In addition, in the method for connecting a thermoplastic resin pipe according to the third and fourth aspects, the cut portion or the straight pipe portion and the end portion of another thermoplastic resin pipe are welded and joined to each other to form a bend. By gripping the straight pipe portion of the pipe joint and the end portion of the other thermoplastic resin pipe with the clamp, it is possible to strongly perform so-called butt welding joining.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a bent pipe fitting of a thermoplastic resin of the present invention.

FIG. 2 is a cutaway front view of essential parts showing a usage state of the thermoplastic resin curved pipe joint of the present invention shown in FIG.

FIG. 3 is a cutaway front view of essential parts showing a next step of using the thermoplastic resin bent pipe joint of the present invention shown in FIG.

FIG. 4 is a cross-sectional view showing a main part of another example of the bent pipe fitting for thermoplastic resin of the present invention.

FIG. 5 is a cross-sectional view showing a main part of still another example of the bent pipe for thermoplastic resin of the present invention.

FIG. 6 is a sectional view showing a main part of still another example of the thermoplastic resin curved pipe joint of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bent pipe joint 11 Receptacle for joining 12 Straight pipe part 13 Boundary part 2 Thermoplastic resin pipe

Claims (4)

[Claims] 1. A thermoplastic resin bent pipe joint having receiving ends provided at both ends thereof, wherein a straight pipe portion is provided at a base portion of at least one receiving port. Curved pipe fitting. 2. A thermoplastic resin bent pipe joint characterized in that a receiving opening having a straight pipe portion at a base portion is detachably attached to the straight pipe portion. 3. The thermoplastic resin bent pipe joint according to claim 1, wherein a portion near a boundary between a straight pipe portion and a receiving portion of a base portion of the receiving portion is cut, and the cut portion pipe opening and another thermoplastic resin pipe. A method for joining a thermoplastic resin pipe, which comprises butt-welding and joining the ends of the. 4. The thermoplastic resin curved pipe joint according to claim 2, wherein the receiving port of the thermoplastic resin curved pipe joint is removed from the straight pipe portion, and the straight pipe portion pipe mouth and the end portion of another thermoplastic resin pipe are butted and welded to each other. A characteristic method for joining thermoplastic resin pipes.