JP2505488Y2 - Fusing type pipe fitting - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a fusion-bonded pipe joint, more specifically, a pipe joint body made of a heat-melting synthetic resin such as a thermoplastic resin. The present invention relates to a pipe joint of a type that is fused and connected to each other.

[0002]

2. Description of the Related Art Pipes such as polyethylene pipes used for gas pipes and polybutene pipes used for water supply and hot water supply pipes cannot be joined with an adhesive. I often do it. As shown in FIG. 4 , in the connection work of the pipes P of the above-described type using the fusion-bonded pipe joint 8, the pipe joint 8 is conventionally supported by the pedestal 91 of the jig 9, and the pipe joint is The tube P inserted in 8,
P is the clamps 92A, 92A and 92B, 92B of the jig 9.
After the preliminary preparation of holding and positioning by the force of the springs 93A, 93B, the heating wire 81 of the pipe joint 8 is heated by energization, and the heat causes the synthetic resin layer of the pipe joint 8 and the pipe of the pipe body to be heated. It was performed through a process of melting the wall and heat-sealing the both. Reference numeral 82 is an electrode terminal.

In such connection work, the jig 9 is necessary to hold the pipe joint 8 concentrically with the pipe body P and prevent external force from being applied to the fusion-bonded portion. If the connection work is performed without using the pipes, the melting state of the melting portion becomes uneven in each part, or the pipe joint 8 or the pipe body P is bent by its own weight at the time of melting, so that both pipe bodies P, P are not directly connected. It may happen. However, the connection work which requires the use of the jig 9 is not only expensive due to the cost required for the jig 9, but also the jig 9 is set on the pipes P, P on both sides of the pipe joint 8, There is a problem in that it is troublesome and time-consuming to secure a space for digging the ground widely for digging the size of 9 and removing the jig 9, which hinders the spread of the fusion-bonded pipe joint 8. ing.

[0004]

The present invention has been made in view of the above circumstances, and a jig 9 as shown in FIG. 4 is provided by providing the pipe joint itself with a function of maintaining the centering of the pipe body . It is an object of the present invention to provide a fusion splicing joint that does not require it.

[0005]

According to a first aspect of the present invention, there is provided a fusion-bonding type pipe joint, wherein a heat-melting synthetic resin pipe joint main body having a heating wire along its inner surface is provided at an end portion of the pipe joint. Body
Along the axis side of the
Projecting pieces are formed, these protruding pieces are elastic contact with the outer surface of the plugged tube body to the pipe joint body, configured to hold concentrically the pipe joint body relative to the tube to cooperate Has been
It is those that.

[0006]

According to this invention , since the pipe joint body is elastically supported by the pipe body through the projecting piece not only before and after fusion but also at the time of fusion, the pipe body and the pipe joint body are The positional relationship is kept concentric during the whole process of work. Especially, pipe fitting book
The protrusions formed at the end of the body are on the axis side of the pipe joint body.
Since it extends outward in the axial direction while approaching the
The thermal effect of time does not reach the projection supporting the pipe.
Therefore, the protrusion may be deformed due to the thermal effect during fusion.
The inner circumference of the pipe joint body and the outer circumference of the pipe body
Will surely be fused.

[0007]

1 is a partially cutaway side view showing a use state of a fusion splicing joint 1 according to an embodiment of the present invention, and FIG. 2 is a front view of the use state.

The pipe joint 1 has a plurality of elastic projections 12 formed on both end faces of a pipe joint body 11 formed by molding an olefin resin such as polyethylene resin or polybutene resin into a tubular shape . Each of the
The plurality of protrusions 12 on the end face are equidistant from each other.
It Also, formed on one end surface and the other end surface of the pipe joint body 11.
Each protruding piece 12 is a shaft of the pipe joint body 11.
It extends outward in the axial direction while approaching the line side. Further
A heating wire 13 that generates heat when energized is spirally arranged along the inner surface a of the pipe joint body 11. The protruding piece 12 includes a base portion 14 protruding from an end surface of the pipe joint body 11 and a pull-in piece portion 16 continuously connected to the base portion 14 via a curved portion 15 in an obliquely outward direction. All the protruding pieces 12 ... Arranged in a circular shape at the ends project from the inner surface a of the pipe joint body 11 to the axial side by the same or substantially the same width. The diameter of an imaginary circle (two-dot chain line in FIG. 2) formed by the array of the protrusions 12 ...
It is set to be slightly smaller than the outer diameter of the pipes P, P connected to 1. As the heating wire 13, a nichrome wire that generates heat when energized, a linear assembly of carbon fiber or carbon powder is used. The heating wire 13 is the inner surface a of the pipe joint body 11 as shown in the figure.
Or may be embedded in the synthetic resin layer of the pipe joint body 11. Reference numeral 17 is an electrode terminal of the heating wire 13.

In such a pipe joint 1, the heating wire 13
The portion where the heating wire 13 is disposed becomes the melting zone S1 which is heated and softened when the heating wire 13 is heated by energization, and the portion where the heating wire 13 is not disposed is not cold even when the heating wire 13 generates heat. It becomes zone S2. In the pipe joint 1 of the illustrated example, the cold zone S2 exists in the central portion and both ends of the pipe joint body 11, and the melting zone S1 exists in the portion sandwiched by the cold zones S2. And all the said protrusions 12 are integrally formed in the cold zone S2.

When the pipe body P is inserted into the pipe joint body 11, the curved portions 15 of the projection 12 which are bent back outwardly against the elasticity of the pipe body P have a plurality of curved portions 15 at equal intervals on the outer surface of the pipe body P. Make elastic contact with the place. Therefore, a plurality of protrusions 12 ...
As shown in FIG. 1, the pipe joint body 11 is held concentrically with the pipe body P. When the pipe body P is inserted, the insertion piece portion 16 of the protruding piece 12 functions as a guide, so that the insertion work is smoothly performed. When the heating wire 13 is energized to heat the heating wire 13 after the pipe body P is inserted into the fitting body 11, the synthetic resin layer is softened or melted in the melting zone S1, and the pipe wall of the piping body P is A portion corresponding to the melting zone S1 is softened or melted, and both are heat-sealed. While such heat fusion is being performed, the protruding piece 12 exerts an aligning holding function and holds the pipe joint body 11 and the pipe body P concentrically. The body P is surely concentrically connected. In this case, the protrusion 12 is in the axial direction of the pipe joint body 11.
Since it extends outwards, the thermal effect of heat fusion causes
No more than twelve. That is, the protruding piece is attached to the inner surface of the pipe joint body.
When it is formed, the protrusion 12 is in the cold zone S2.
Even if it is formed in the
It is said that the projecting piece softens and deforms due to the influence of the heat
A situation can occur. Especially if the fitting body is small
Indeed, the protrusion provided in the cold zone is the melting zone
Since it is unavoidable to approach the
As mentioned above, the thermal effect becomes large and uniform and reliable fusion
Is hard to do. In this respect, as described above, the protrusion 12 is a pipe.
When the joint body 11 extends axially outwardly, the
Since the influence of heat does not reach the protrusion 12,
Therefore, the pipe P is supported in the initial state even during fusion, and the pipe joint is supported.
The inner surface of the hand body 11 and the inner surface of the pipe body P are evenly and reliably fused.
Will be done.

The pipe body P is inserted into the pipe joint body 11 so that the pipe joint body 11 is held by the pipe body P through the protruding pieces 12, and the rubber ring 18 is provided on the plurality of protruding pieces 12 as shown in FIG. May be fitted, and the elastic pieces of the rubber ring 18 may be used to fasten the projecting pieces 12 to the pipe body P in advance. With this configuration, the rubber ring 18 exerts the centering holding function in addition to the centering holding function of the protruding piece 12, so that the pipe joint body 11 is more surely held concentrically with the pipe body P. . Since the pipe joint 1 of FIG. 3 is the same as the pipe joint 1 described in FIGS. 1 and 2, the same parts are designated by the same reference numerals.

[0012]

According to the fusion-bonding type pipe joint of the first aspect of the invention, the pipe joint itself has the function of maintaining the centering of the pipe body, so that the commercial value is increased and the jig explained in the conventional example. Is unnecessary, the cost is reduced accordingly, the labor required for pre-preparation is saved, the connection workability is improved, and the spread of the fusion splicing joint is promoted. Moreover, in the present invention, the plurality of protrusions formed at the end of the pipe joint body are axially aligned.
Since it extends outward, the thermal effect during fusion
It does not reach the projecting piece that supports it, and it projects due to the thermal influence during fusion.
Since the piece does not deform, the inner circumference of the pipe joint body and the outer circumference of the pipe body
The excellent effect of ensuring uniform fusion
The fruit is played.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing a usage state of a fusion splicing pipe joint according to an embodiment of the present invention.

FIG. 2 is a front view of the same usage state.

FIG. 3 is a partially cutaway side view showing a different usage state of the same pipe joint as in FIG.

FIG. 4 is a partial breakage for explaining the connection work using a jig .
It is a sectional side view.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Pipe joint 11 Pipe joint main body 12 Projecting piece 13 Heat generating wire 14 Base part a Pipe joint body inner surface P Pipe body

Claims (1)

(57) [Scope of utility model registration request] 1. A pipe joint body is provided at an end portion of a pipe body made of a heat-meltable synthetic resin in which a heating wire is arranged along an inner surface.
Along the axis side of the
Projecting pieces are formed, these protruding pieces are elastic contact with the outer surface of the plugged tube body to the pipe joint body, configured to hold concentrically the pipe joint body relative to the tube to cooperate Has been
Fusion type pipe coupling, characterized in that that.