KR950005506Y1 - Double walled pipe for insulation - Google Patents

Abstract

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Description

Joint structure of double insulation pipe

1 is a perspective view taken from the joint of the adiabatic double tube of the present invention.

2A and 2B are longitudinal cross-sectional views of FIG. 1, in which (a) is a state in which a polyurethane liquid is poured into a joint, and (b) is a state diagram in which connection work of the joint is completed.

3 is a perspective view of another embodiment of the present invention.

4 is a longitudinal sectional view of FIG.

5 is an exemplary embodiment in which the inner tube is built in a double line on the appearance of the insulated double tube.

* Explanation of symbols for main parts of the drawings

1: double insulation tube 2: appearance

3: inner tube 4: insulation layer

5: pussy ring 7, 7 ': hole

8: sleeve 8 ': hole for polyurethane liquid injection

9: heat shrinkable film layer

The present invention relates to the joint of a heat insulation double pipe which is used for the district heating system and the piping such as cogeneration, chemical transfer or low temperature cold storage. By installing it, the joint part of the double insulation pipe is always kept in a rounded state so that the connection work of the cross section of the joint is convenient.

Conventional insulation double tube is a configuration in which a heat insulating material (polyurethane foam layer) is filled between the outer diameter of the large diameter cut to a predetermined length and the inner diameter of the inner diameter pipe, explaining the connection work, a sleeve that can cover the connection of the abutted double insulation tube Is inserted into the insulated double pipe, welds the end face of the inner pipe, covers it with a sleeve, and injects the expandable polyurethane liquid to form a heat insulating layer, and then seals the outer circumferential surface with a heat shrinkable film. to be.

This conventional connection work is caused by the weight of the insulation double pipe of the weight or by the load during storage, the closed end of both ends of the insulation double pipe from the source to the ellipse, which makes the installation of the sleeve very difficult during the connection work There was a problem that made the connection work difficult.

The present invention provides an easy-to-fit sleeve during connection by installing a retaining ring between the large and small pipes at both ends of the insulated double pipe for the purpose of solving the above problems. It will be described below, the configuration of the subject innovation according to the accompanying drawings.

In a conventional heat insulating double pipe (1) generally composed of a polyurethane foam insulating layer (4) between a metal inner tube (3) and a synthetic resin outer material (2), holes (7) and (7 ') are drilled at both ends thereof. The ring (5) is sandwiched between the inner and outer tubes and fixed with synthetic resin welding.

Reference numeral 8 denotes a sleeve covering the joint portion, and a hole 8 'for foaming polyurethane liquid injection is drilled in the center thereof, and 9 denotes a heat shrinkable film layer.

This invention has a disc-shaped retaining ring (5) is installed at both ends of the heat insulation double pipe (1) to prevent the distortion of the appearance (2), so that the load during transportation or storage of the heat insulation double pipe (1) It is easy to fit the sleeve 8 during the conventional connection work as described above because it keeps the appearance 2 without being distorted by itself or by its own weight. It works.

3 and 4 show that both the inner tube 3 and the outer tube 2 are made of synthetic resin material. Therefore, the cross section of the tube is bonded to the correct position at the time of heat-sealed connection.

As shown in Fig. 5, even in a heat insulation double tube in which a plurality of inner tubes are provided in the outer surface, the holding ring is provided at both ends thereof to have the above-described effect.

Claims (3)

In a normal heat insulation double pipe 1 composed of a heat insulation layer 4 between an inner tube 3 and an outer appearance 2, a retaining ring 5 having holes 7 and 7 'bored at both ends thereof is sandwiched between the inner and outer tubes. The joint structure of the double insulation pipe inserted and fixed by welding. The joint of an insulating double pipe according to claim 1, wherein a retaining ring (5) having holes (7) (7 ') drilled between the inner and outer tubes is formed at both ends of the same length of the synthetic resin inner tube (3) and the outer tube (2). rescue. The joint structure of a heat insulation double pipe according to claim 1, wherein a retaining ring (5) having holes (7) (7 ') drilled in both ends of the outer tube (2) is provided between the inner and outer tubes.