KR200318953Y1 - Synthetic resin double pipe - Google Patents

Abstract

Synthetic resin double pipe 10 according to the present invention extends with a predetermined inner diameter (D1) and the inner pipe 11 made of a PP pipe, and inserted into the outer pipe 11 in the longitudinal direction and made of an XL pipe The pipe 12 is provided.

Accordingly, the synthetic resin double pipe 10 according to the present invention has an excellent effect in terms of noise and insulation and at the same time has sufficient load capacity. In addition, since the end of the synthetic resin double pipe 10 can be heat-sealed through the coupler 20 made of synthetic resin, the connection work is made easy, and there is an effect of preventing the occurrence of leakage.

Description

Synthetic resin double pipe {SYNTHETIC RESIN DOUBLE PIPE}

The present invention relates to a double pipe, and more particularly to a double-pipe synthetic resin to improve the noise and insulation performance by configuring the inside of the plastic pipe in a double.

In general, pipes made of a synthetic resin such as polyethylene (polyethlene) having excellent chemical resistance, cold resistance, and durability in transporting fluids such as water, sewage, and the like have a cylindrical cross section. Such synthetic resin pipes are also used for piping of ondol heating systems.

However, since the conventional synthetic resin pipe is made of a single pipe, its effect is relatively inferior in noise or insulation, and its use is not possible in places requiring load.

In order to solve this problem, recently, a double pipe type resin pipe has been disclosed. That is, referring to Figure 1, the conventional double pipe type pipe (1) by forming a wall by spirally winding a rectangular pipe to form a double wall, thereby increasing the effect in terms of noise and heat insulation and at the same time has a sufficient load capacity. .

In addition, since the double pipe type pipe 1 is manufactured to have a certain length, it is necessary to connect the pipes 1 to each other in order to form a long flow path at a construction site. To this end, as shown in FIG. 2, a PE foam 2 is wrapped around the pipe 1 and the connection portion of the pipe 1, and an HDPE sheet 3 is disposed on the outer circumferential surface of the PE foam 2. Wind up The HDPE sheet 3 is tied through a tightening band 4 with screwed bolts, whereby the connections between the pipes 1 are sealed.

However, since the conventional double pipe (1) is manufactured while forming a wall by winding a rectangular pipe in a spiral shape, it is not only difficult to manufacture, but also has a significant disadvantage.

In addition, since the connection structure of the conventional double pipe (1) requires a separate tightening band (4), as well as increase the operating cost, there is a disadvantage in that the connection workability is poor by having to tighten the tightening band (4) one by one. .

The present invention is to solve this problem, an object of the present invention is to improve the internal structure of the pipe to provide a synthetic double pipe having excellent load capacity and excellent effect in terms of noise and insulation.

In addition, another object of the present invention is to provide a double pipe synthetic resin that can be easily and reliably connected through a coupler made of a synthetic resin double pipe.

1 schematically shows a conventional double tube structure.

Figure 2 shows a connection structure of a conventional double pipe.

Figure 3 schematically shows a synthetic resin double pipe and its connection structure according to the present invention.

4 is a cross-sectional view taken along line IV-IV of FIG. 3, showing a connection structure of a double pipe.

5 is a perspective view of a coupler to which the present invention is applied.

* Description of the symbols for the main parts of the drawings *

10..Double pipe

11.Outer pipe

12.Inner pipe

The present invention for achieving this object is;

In the synthetic resin pipe used for water and hot water piping,

The synthetic resin pipe is characterized by consisting of an outer pipe extending with a predetermined inner diameter and an inner pipe inserted into the outer pipe in the longitudinal direction.

In addition, the outer pipe is made of a PP pipe, the inner pipe is characterized in that made of XL pipe.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

3 and 4, the synthetic resin double pipe 10 according to the present invention is used as a pipe for water, hot water, heating, the ends thereof are connected in series through a synthetic resin coupler 20 in the form of a pipe. .

The synthetic resin double pipe 10 is exposed to the outside and has an outer pipe 11 having a predetermined inner diameter D1, and an inner pipe 12 having a predetermined diameter D2 so as to be inserted into the outer pipe 11 with ease. )

The outer pipe 11 is made of a polypropylene pipe (polypropylene pipe, also known as PP pipe), the inner diameter (D1) of the embodiment of the present invention was composed of about 15 ~ 16mm. The outer pipe 11 is made of a PP material, it is possible to heat fusion when connecting to the coupler 20, thereby avoiding the risk of leakage.

And the inner pipe 12 is made of cross-linking polyethylene pipe (called XL pipe), in the embodiment of the present invention its diameter (D2) is allowed to rest in the outer pipe (11) It is composed of about 15mm so that it can be inserted. The inner pipe 12 is characterized by good heat resistance, elasticity and impact resistance, and thus the shape of the inner pipe 12 is maintained by the inner pipe 12 even when heat is applied to the outer pipe 11 for a predetermined time.

On the other hand, the coupler 30 for interconnecting the end of the double pipe 10 is configured in the form of a pipe, as shown in Figure 4 and 5 both ends of the double pipe 10 of the inner circumference of the coupler 20 The expansion pipe part 21 in which the latching jaw 22 was formed so that an edge part may be engaged by force is provided, respectively. The inner diameter D3 of the expansion pipe 21 was configured to be substantially the same as the outer diameter of the outer pipe 11.

In addition, the coupler 20 is preferably made of the same PP material as the material of the outer pipe 11, which is to thermally fusion coupler 20 and the outer pipe (11).

Next will be described the operation of connecting the synthetic resin double pipe according to the present invention configured as described above and the effects thereof.

First, heat is applied to the end of the double pipe 10 into which the inner pipe 12 is inserted into the outer pipe 11 and the inner circumference of the expansion portion 21 of the coupler 20. At this time, heat is applied to the inner circumference of the expansion portion 21 of the coupler 20 and the end of the double pipe 10 at about 250 to 260 degrees for about 3 to 4 seconds. Accordingly, the expansion portion 21 of the coupler 20 and the end of the double pipe 10 (that is, the outer periphery of the end of the outer pipe 11) are in a semi-melt state.

When the end of the double pipe 10 is pushed into the expansion portion 21 of the coupler 20 in such a semi-melt state, the external pipe 11 of the double pipe 10 is easily inserted into the expansion portion 21 and mutually opened. After fusion and cooling after a predetermined time, the outer pipe 11 and the coupler 20 of the double pipe 10 are integrated with each other. This thermal fusion is because the outer pipe 11 and the coupler 20 is made of the same material (PP material).

At this time, since the inner pipe 12 made of the XL pipe is excellent in heat resistance, it does not deform even when heat is applied. Accordingly, in the process of inserting the outer pipe 11 and the inner pipe 12 in the semi-molten state into the expansion portion 21 of the coupler 20, the inner pipe 12 is caught by the expansion pipe 21. The outer pipe 11 and the coupler 20 are thermally fused more firmly at the same time, limiting further insertion.

In addition, even when the double pipe 10 is cooled, the inner pipe 12 maintains its own shape and the flow path in the double pipe 10 is also maintained.

As a result, when the double pipe 10 is connected through the coupler 20, the outer pipe 11 is thermally fused to prevent leakage and, as a result, the external pipe 12 is not heated by the inner pipe 12. The pipe 11 is more firmly coupled to the expansion portion 21 of the coupler 20.

As described above in detail, according to the synthetic resin double pipe according to the present invention; It extends with a predetermined inner diameter and has an outer pipe made of a PP pipe, and an inner pipe made of an XL pipe longitudinally inserted into the outer pipe. Accordingly, the synthetic resin double pipe according to the present invention has an excellent effect in terms of noise and insulation and at the same time has sufficient load capacity. In addition, since the end of the synthetic resin double pipe can be heat-sealed through a coupler made of synthetic resin, its connection work is easily made, and there is an effect of preventing the occurrence of leakage.

Claims (2)

In the synthetic resin pipe used for water and hot water piping, The synthetic resin pipe 10, An outer pipe 11 extending while having a predetermined inner diameter, Synthetic resin double pipe, characterized in that consisting of the inner pipe (12) inserted in the longitudinal direction in the outer pipe (11). The method of claim 1, The outer pipe 11 is made of a PP pipe, The inner pipe 12 is a synthetic resin double pipe, characterized in that made of XL pipe.