JPH1163379A - Refrigerant piping material batch-coating two pipes with heat insulating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a refrigerant tie-in piping strong against external pressure without shifting or being crushed at the time of being finished with external facing material and simplify heat insulating work. SOLUTION: A liquid side pipe 1 and a gas side pipe 2 of a refrigerant piping are batch-coated with heat insulating material 3 with a cylindrical outline. At the same time, the surface of the cylindrical heat insulating material 3 is provided with grooves 5 in four places shifted by 90 deg. in the longitudinal direction of the heat insulating material 3. Even in case of a bent part of the refrigerant pipe being connected in four vertical and lateral directions, the bent part is provided with grooves 6 of the same condition so as to be able to easily execute the wiring of cables of instrumentation piping.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for insulating a pipe outside a pipe through which a low-temperature or high-temperature fluid passes, such as a refrigerant used in a refrigerator or an air conditioner.

[0002]

2. Description of the Related Art Conventionally, a refrigerant pipe uses a refrigerant cladding pipe in which a heat insulating material is covered on the outside of the pipe on both a liquid side pipe and a gas side pipe.
The two cables and the instrumentation wiring cable are tied together to form a tied pipe, or a pre-tied product (pair tube) is used. When performing this piping on exposed parts that are visible to the public, finishing is performed using exterior materials to improve appearance, but since the outer shape of the tied piping is flat, wind up a glass wool insulation tube etc. They were covered with cardboard or polyethylene sheets and finished with exterior materials, making them behave as if they were a single pipe. (FIG. 4)

[0003]

In the finishing step using an exterior material, since the outer shape of the tying pipe is flat, a glass wool heat insulating tube or the like is wound around, the cylindrical shape is formed, and then the exterior material is covered. However, this method is very labor-intensive and costly, and in addition, a gap (15) is always generated inside the heat retaining tube wound around the tying pipe, which is vulnerable to external pressure, and the exterior material is displaced. , Was causing crushing.

[0004]

In order to achieve the above object, a refrigerant pipe according to the present invention comprises a heat insulating material integrally formed over a liquid side pipe and a gas side pipe of a refrigerant which are arranged in parallel, and has a cylindrical outer shape. At the same time, a groove was formed on the surface so that a cable for instrumentation wiring could be routed.

Further, in order to perform heat insulation work later on a welding or bonding part at the site, a heat insulating cover having a cylindrical outer shape, which is formed and covered with two parallel pipes, is prepared.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. In FIG. 1, a liquid side pipe (1) and a gas side pipe (2) are provided in parallel, and a heat insulating material (3) is collectively coated on both pipes, and the outer shape of the heat insulating material conforms to the standard dimensions of a general-purpose exterior material. And adjusted to a cylindrical shape. In this way, the exterior material (4) can be easily covered.

At the same time, on the surface of the cylindrical heat insulating material, four grooves (5) shifted by 90 degrees in the longitudinal direction of the heat insulating material are provided so that a cable for instrumentation wiring can be routed. Even if the bent part is connected in four directions, up, down, left and right,
A groove (6) having the same condition is provided in the bent portion so that the connection can be easily made.

In FIG. 2, the minimum adiabatic thickness of the liquid side pipe (7), the minimum adiabatic thickness of the gas side pipe (8), and the thickness between the liquid side pipe and the gas side pipe (9) are constructed respectively. It was made to exceed the standard stipulated in the guidelines for supervising construction of machine-saving equipment.

FIG. 3 shows two small holes (10) and (11) for passing a liquid side pipe and a gas side pipe in a cylindrical heat insulating material in order to insulate a welded or bonded part. A heat-insulating cover that can be opened and closed by making a notch (12) that passes through it and making it a back crack, which can be opened and closed.

[0010]

Since the present invention is configured as described above, it has the following effects.

[0011] Since both the liquid side pipe and the gas side pipe of the refrigerant pipe are covered at once, and the outer shape is made cylindrical, no voids are formed inside, and the external pressure is increased, so that displacement and dents of the exterior material are caused. Gone,

Since there is no need to use a glass wool heat insulating cylinder, cardboard, polyethylene tape or the like to form a cylindrical shape, the finishing work of the piping is greatly simplified.

Further, since the outer shape of the cylindrical heat insulating material conforms to the dimensional standard of a general-purpose exterior material, the finishing work is completed only by covering the exterior material.

Further, a groove is provided on the surface of the heat insulating material so that the instrumentation wiring can be wired at the same time as the refrigerant pipe, and the instrumentation wiring can be concealed by finishing with the exterior material.

If the heat-insulating cover according to the present invention is used for a processed portion such as welding or bonding, the heat-insulating work can be easily completed, and the cylindrical shape can be finished at the same time.

[Brief description of the drawings]

FIG. 1 is a perspective view of a refrigerant pipe material which is collectively covered with a heat insulating material according to the present invention.

FIG. 2 is a cross-sectional view of a refrigerant pipe material which is collectively covered with a heat insulating material according to the present invention.

FIG. 3 is a view of a heat insulating cover according to the present invention.

FIG. 4 shows a conventional refrigerant pipe having an exterior finish.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid side pipe 2 Gas side pipe 3 Heat insulating material 4 Exterior material 5, 6 groove 7 Minimum heat insulating thickness of liquid side pipe 8 Minimum heat insulating thickness of gas side pipe 9 Thickness between liquid side pipe and gas side pipe 10 , 11 small hole 12 cut 13 glass wool insulation tube 14 instrumentation cable 15 gap

Claims (3)

[Claims] (1) A tube in which two parallel pipes are covered with an integrally molded hard heat insulating material and the outer shape is finished in a cylindrical shape, so that the pipes behave as if they were a single pipe. 2. A cable in which instrumentation wiring cables can be embedded by providing four grooves in the longitudinal direction of a cylindrical outer shape. 3. A heat-insulating cover with a cylindrical outer shape which has been subjected to a back cracking process and which is put on two parallel pipes to insulate a welded or bonded portion of the pipe by post-processing.