JPH08243U - Fusing type pipe fitting - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] In a fusion-bonded pipe joint, the airtightness and watertightness between the axial central portion (back side portion) of the pipe joint body and the pipe body are
Make sure that the fused state is maintained regardless of the quality.
The pipe joint itself has a function of holding the pipe joint with respect to the pipe body. SOLUTION: The heating wire 13 in a pipe joint body 11 made of a heat-meltable synthetic resin in which a heating wire 13 is arranged along an inner surface a.
A cold zone S2 in which the heating wire 13 does not exist is provided on the back side of the melting zone S1 in which the rubber ring 20 is housed. The annular groove 19 is formed in the cold zone S2. The rubber ring 20 may be provided in both of the cold zones S2 on both sides of the melting zone S1. The inner diameter of the rubber ring 20 is slightly smaller than the outer diameter of the tubular body P.

Description

[Detailed description of the device]

[0001]

[Field of Invention]

 The present invention is a fusion-bonded pipe joint, more specifically, a pipe joint body is made of a heat-meltable synthetic resin such as a thermoplastic resin, and the pipe joint body and the pipe body are heat-sealed to connect the two. To a pipe joint of the type.

[0002]

[Prior art]

 Pipes such as polyethylene pipes used for gas pipes and polypropylene pipes used for water and hot water supply pipes cannot be joined with an adhesive, so the above-mentioned fusion splicing joints are often used for connection. . As shown in FIG. 2, when the pipes P of the above-described type using the fusion-bonded pipe joint 8 are connected to each other, the pipe joint 8 is conventionally supported by the base 91 of the jig 9, and After the pipes P, P inserted in 8 are clamped and positioned by the clamps 92A, 92A and 92B, 92B of the jig 9 by the force of springs 93A, 93B, the pipe joint 8 The heating wire 81 is heated by energization, the synthetic resin layer of the pipe joint 8 and the pipe wall of the pipe body are melted by the heat, and the both are heat-sealed. Reference numeral 82 is an electrode terminal.

In such a connection work, if the connection work is performed without using the jig 9, the molten state of the molten portion becomes uneven, or the pipe joint 8 and the pipe body P are bent by their own weight during the melting. There is a case where the pipe bodies P, P are not directly connected. If the molten state at the melting point becomes non-uniform or both pipes P, P are not connected straight, there is a gap between the pipe joint 8 and the pipes P, P that may be defective. However, there is a problem that gas or liquid (such as tap water) leaks from the gap. In particular, in the case of water supply / hot water supply piping, if a gap is left behind the pipe joint 8 (in the central portion in the axial direction in the illustrated example), the heating wire may come into contact with water and corrode, possibly contaminating the water supply.

In addition, not only the cost required for the jig 9 is expensive for the connection work that requires the use of the jig 9, but also the jig 9 is set on the pipe bodies P on both sides of the pipe joint 8. There is a problem that it takes time and labor to dig a large area of the jig 9 to secure a space for digging the jig 9 and removing the jig 9, and that is a problem with the fusion-type pipe joint 8 Is hindering the spread of.

[0005]

[Problems to be solved by the device]

 The present invention has been made in view of the above circumstances, and when performing the above connecting work, even if the molten state of the molten portion becomes uneven or both pipes are not connected straight Another object of the present invention is to provide a fusion splicing pipe joint in which the airtightness and watertightness between the pipe joint body and the pipe body are surely maintained at the inner side of the pipe joint body.

Further, the present invention aims to provide a fusion-bonding type pipe joint that does not require the jig 9 as shown in FIG. 2 by providing the pipe joint itself with a function of maintaining the centering of the pipe body. Target

[0007]

[Means for Solving the Problems]

 In the fusion-bonding type pipe joint according to the invention of claim 1, a melting zone in which a heating wire is arranged is formed in a pipe joint body made of a heat-meltable synthetic resin, and a heating line of the heating wire is provided on the back side of the melting zone. A cold zone that is not arranged is formed, and an inner diameter that can fit into the pipe inserted into the pipe joint body and is slightly smaller than the outer diameter of the pipe in the annular groove formed in this cold zone. A rubber ring having is stored.

With this configuration, when the pipe body is inserted into the pipe joint body and the pipe body is fitted to the rubber ring, the airtightness and watertightness between the pipe joint body and the pipe body are already reduced. It is secured by a rubber ring provided in the cold zone at the back of the melting zone. Therefore, when it is used for water supply and hot water supply piping, even if the melting state at the melting point becomes uneven due to subsequent fusion or both pipes are not connected straight, the heating wire will come into contact with water. There is no risk of corrosion and water contamination.

In the fusion-bonding type pipe joint according to the second aspect of the present invention, a melting zone in which a heating wire is arranged is formed in a pipe joint body made of a heat-melting synthetic resin, and both sides of the melting zone are formed. A cold zone in which no heating wire is arranged is formed on the side, and the annular groove formed in each of these cold zones can be fitted into the pipe body inserted into the pipe joint body and the pipe body can be fitted. It contains a rubber ring with an inner diameter slightly smaller than the outer diameter.

According to this structure, the rubber rings provided in the cold zones formed on both sides of the melting zone of the pipe joint body are fitted to the pipe body, so that the pipes are inserted through the rubber rings. The joint body is elastically supported by the pipe body. Therefore, the positional relationship between the pipe body and the pipe joint main body is kept concentric during the whole process of the work.

[0011]

[Embodiment of device]

 FIG. 1 is a partially cutaway side view showing an embodiment of the invention of claim 1 or claim 2.

The pipe joint 1 has a heating wire 13 spirally formed along the inner surface a of a pipe joint body 11 made by molding an olefin resin such as polyethylene resin or polybutene resin into a cylindrical shape. It is provided. 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 may be disposed on the inner surface a of the pipe joint body 11 as shown in the drawing, or may be embedded in the synthetic resin layer of the pipe joint body 11.

In such a pipe joint 1, a portion where the heating wire 13 is arranged becomes a melting zone S1 in which the heating wire 13 is heated and softened when the heating wire 13 is heated by energization, and the heating wire 13 is arranged. The non-existing portion becomes a cold zone S2 which is not heated even by the heat generated by the heating wire 13. In the pipe joint 1 of the illustrated example, melting zones S1 are formed at two locations, and cold zones S2 are formed on the inner and outer sides of each melting zone S1, that is, on both sides of the melting zone S1. .

Annular grooves 19 are formed in the cold zone S2 on the inner side and the cold zone S2 on the outer side of the pipe joint body 11, and the rubber rings 20 are housed in the annular grooves 19 ... There is. The rubber ring 20 has an inner diameter slightly smaller than the outer peripheral diameter of the pipe body P, and when the pipe body P is inserted into the joint main body 11, the pipe body P is expanded slightly in diameter. It is designed to fit in.

When the pipe body P is inserted into the pipe joint body 11 and fitted into the rubber ring 20, the four rubber rings 20 are brought into close contact with the outer peripheral surface of the pipe body P at four positions. Airtightness and watertightness with the pipe body P are ensured by these rubber rings 20. Further, by fitting the four rubber rings 20 to the pipes P, P, the pipe joint body 11 is elastically supported by the pipes P, P via the rubber rings 20. Therefore, the positional relationship between the pipes P, P and the pipe joint body 11 is kept concentric.

After inserting the pipe body P into the pipe joint body 11, when the heating wire 13 is energized to generate heat, the synthetic resin layer is softened or melted in the melting zone S1, and the pipe of the pipe body P is The wall also softens or melts at a portion corresponding to the melting zone S1, and both are heat-sealed. While such heat fusion is being performed, the rubber ring 20 exerts an aligning and holding function and holds the pipe joint body 11 and the pipe body P concentrically. And the pipe P are reliably connected concentrically.

When such heat fusion is performed, even if the melting state at the melting point becomes non-uniform or both pipes P, P are not connected straight, the pipe joint body 11 The airtightness and watertightness between the pipes P and P are reliably maintained from the beginning by the rubber ring 20, so that the airtightness and watertightness will not be lost.

In order to ensure the airtightness and watertightness of the rubber ring 20, the cold zone S2 (in the center of the pipe joint body 11 in the axial direction of the pipe body 11 in FIG. It is sufficient to form the annular groove 19 only in the cold zone S2) and accommodate the rubber ring 20 in the annular groove 19, and the cold zone S2 at the end of the pipe joint body 11, that is, the melting zone. It is not essential to arrange the rubber ring 20 in the cold zone S2 outside the S1. That is, in the water / hot water supply pipe, if the rubber ring 20 is provided only in the cold zone S2 on the back side of the melting zone S1 and the rubber ring 20 is kept watertight, the heating wire 13 will corrode due to contact with water. Since this is not the case, the situation where the heating wire 13 contacts the water and pollutes the water supply does not occur. However, in order for the rubber ring 20 to exert the function of maintaining the alignment, the rubber ring 20 needs to be provided in both the cold zones S2 and S2 on both sides of the melting zone S1.

[0019]

[Effect of device]

 According to the fusion-bonded pipe joint of the invention according to claim 1 or 2, the pipe body is inserted between the pipe joint body and the pipe body by simply inserting the pipe body into the rubber ring and fitting the pipe body into the rubber ring. Since the airtightness and liquid-tightness are secured, even if the melting state at the melting point becomes defective or uneven due to the subsequent fusion, both pipes may not be connected straight. The rubber ring ensures that the airtightness and the liquidtightness between the pipe joint body and the pipe body are maintained, and the situation in which gas or liquid leaks can be reliably prevented. In particular, since the rubber ring is installed on the inner side of the melting zone in the pipe joint body, when it is used for water supply / hot water supply piping, the subsequent fusion will cause the molten state at the melting point to become non-uniform. Even if the pipe body is not connected straight, there is an excellent effect that there is no possibility that the heating wire comes into contact with water to corrode and pollute the water supply.

Further, according to the fusion-bonded pipe joint of the invention according to claim 2, since the pipe joint itself has the function of maintaining the centering with respect to the pipe body through the rubber ring, the product value is increased at the same time. , The jig explained in the conventional example is not required, the cost is reduced accordingly, the labor required for preparation is saved, the connection workability is improved, and the spread of fusion splicing joints is promoted. Moreover, in the present invention, since the pipe joint body and the pipe body are securely held concentrically at the time of fusion bonding, the pipe joint and the pipe body are surely connected according to the initial setting.

[Brief description of drawings]

1 is a partially cutaway side view showing an embodiment of the invention of claim 1 or claim 2;

FIG. 2 is a partially cutaway side view for explaining a connecting operation using a jig.

[Explanation of symbols]

 1 Pipe Joint 11 Pipe Joint Main Body 13 Exothermic Wire 19 Annular Groove 20 Rubber Ring S1 Melting Zone S2 Cold Zone P Pipe

Claims (2)

[Scope of utility model registration request] 1. A melting zone in which a heating wire is arranged is formed in a pipe joint body made of a heat-meltable synthetic resin, and a cold zone in which a heating wire is not arranged is provided on the inner side of the melting zone. In the annular groove formed in the cold zone, a rubber ring that can fit into the pipe inserted into the pipe joint body and has an inner diameter slightly smaller than the outer diameter of the pipe is housed. A fusion-bonded pipe joint characterized in that 2. A cold zone in which a heating zone is formed in a pipe joint body made of a heat-meltable synthetic resin and heating lines are not disposed on both sides of the melting zone. In the annular groove formed in each of these cold zones, there is a rubber ring that can fit into the pipe inserted into the pipe joint body and has an inner diameter slightly smaller than the outer diameter of the pipe. A fusion-bonding pipe joint, which is housed.