JPH0989168A - Transport pipe for water supply and hot water supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve heat insulating properties to the outside air temperature around a pipe, so as to prevent dew from being generated on the surface of the pipe, by providing a metallic bellows pipe made of copper or stainless on the inner side, and providing a soft resin-made film formed of a plurality of layers coated on the outer peripheral surface of the bellows pipe through a process of providing air layers extending in the pipe axial direction. SOLUTION: The outer surface of a stainless-made bellows pipe 1 is covered with an intermediate film 2 made of polyvinyl chloride. The outer surface of the intermediate film 2 is covered with an outer layer film 3 made of polyvinyl chloride. The inner peripheral surface of the outer layer film 3 is formed into an irregular surface by providing many recessed grooves 4 extending in the pipe axial direction. The recessed grooves 4 are provided on the whole inner peripheral surface. Therefore, an air layer 8 between the bellows pipe 1 and the intermediate film 2, and an air layer 9 between the outer layer film and the intermediate film 2 by the recessed grooves 4 provided on the inner peripheral surface of the outer layer film 3 are formed, and heat insulating and heat reserving actions of fluid to flow in the stainless bellows pipe 1 are performed by two-layered air layers 8, 9 in the outside diametrical direction of the pipe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transportation pipe which is suitable for water supply and hot water supply and which can be easily arranged.

[0002]

2. Description of the Related Art Conventionally, in gas pipes and the like, pipes having a thin-walled stainless steel bellows pipe coated with a synthetic resin film have been widely used. This product is flexible and light, so it can be easily piped.Because the synthetic resin coating layer on the outer surface protects the thin-walled stainless steel bellows tube, it is prevented that the surface of the bellows tube is scratched. It is a very excellent pipe for piping.

[0003]

The above-mentioned stainless steel bellows pipe with a synthetic resin coating layer is excellent for gas pipes. However, for example, when it is used for pipes for transporting clean water, moisture in the air causes dew condensation. There is a problem that dew is generated on the surface of the pipe, or when it is used for hot water piping, heat is exchanged with the outside air temperature around the piping to lower the temperature of hot water for transportation. Therefore, it is necessary to wrap a heat insulating material on the outer peripheral surface of the pipe,
It was rarely used except for some limited uses.
Therefore, the present invention increases the heat insulating property with respect to the ambient temperature around the pipe,
(EN) Provided is a transport pipe for hot and cold water supply, which makes it easy to construct a pipe without dew on the surface of the pipe.

[0004]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a metal bellows tube made of copper, stainless steel or the like on the inside, and a plurality of air bellows provided on the outer peripheral surface of the bellows tube so as to extend along the tube axis direction. It is a transport pipe for hot and cold water supply, characterized by comprising a layer made of a soft resin. The air layer can be provided by forming a plurality of groove grooves extending along the tube axis direction on the inner peripheral surface of the coating. Further, the air layer can be formed by forming a plurality of groove grooves extending along the tube axis direction on the outer peripheral surface of the film and forming an air layer between the air layer and the film provided on the outer surface. Further, in the above, a synthetic resin film can be provided by further providing a plurality of air layers extending along the tube axis direction on the outer peripheral surface of the film provided with the air layer.

[0005]

Since the present invention has the above-mentioned structure, the air layer between the outer surface bellows recess of the metal bellows tube and the synthetic resin film covering the bellows recess, and the air extending on the outer peripheral surface along the tube axis direction. An air layer between the layer and the coated film is provided over two layers. The plurality of air layers insulate the fluid passing through the bellows pipe from the ambient air around the pipe, so that no dew is generated on the surface of the pipe or the temperature of the fluid does not change. In addition, since the multi-layer coating that covers the outer circumference of the bellows tube is made of soft resin, the flexibility of the metal bellows tube made of metal such as copper or stainless steel is not significantly impaired, and the workability of water supply and hot water supply piping is improved. Is also good.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is a transverse sectional view thereof. In the figure, 1 is 0.3 m thick
m is a stainless steel bellows tube made of SUS316, 2 is a vinyl chloride resin intermediate film coated on the outer surface of the stainless steel bellows tube 3, and 3 is the same thickness 0. It is an outer layer film made of vinyl chloride resin having a thickness of 5 to 1 mm.

As shown in FIG. 2, the inner peripheral surface of the outer layer 3 is provided with a large number of groove grooves 4 extending along the tube axis direction, and is an uneven surface. The depth of the groove 4 is about 0.3 to 1.5
mm, and provided on the entire inner peripheral surface at a pitch interval of about 1 to 3 mm. As a result, an air layer 8 is formed between the bellows tube 1 and the intermediate film 2, and an air layer 9 is formed between the outer film 3 and the intermediate film 2 by the groove 4 provided on the inner peripheral surface of the outer film 3. The layers of air layers 8 and 9 perform adiabatic heat retention of the fluid passing through the stainless bellows tube 1.

FIGS. 3 and 4 are sectional views of a transport pipe showing another embodiment. In this embodiment, the outer surface of the vinyl chloride resin intermediate film 5 covering the outer surface of the stainless bellows tube 1 is covered with a pipe. A large number of recessed grooves 6 extending along the axial direction are provided,
The outer layer coating 7 is a vinyl chloride resin coating 7 having flat inner and outer peripheral surfaces. The grooved groove 6 on the outer peripheral surface of the intermediate coating 5 is larger than the grooved groove 4 of the outer layer 3 of the above embodiment, and the depth thereof is about 2 to 4 mm and the pitch is about 2 mm. An air layer 10 is formed by providing a flat outer layer coating 7 on both the inner and outer peripheral surfaces on the outer peripheral surface. Also in this embodiment, the bellows tube 1 and the intermediate film 5
The air layer 8 between them and the air layer 10 between the groove 6 provided on the outer peripheral surface of the intermediate coating 5 and the outer coating 7 perform adiabatic heat retention of the fluid passing through the stainless bellows tube 1.

FIGS. 5 and 6 are sectional views of a transport pipe showing still another embodiment. In this embodiment, an intermediate coating 11 for coating the outer peripheral surface of a stainless steel bellows tube and an outer peripheral surface of this intermediate coating are coated. As shown in the figure, a large number of groove grooves 13 and 14 extending along the tube axis direction are provided on the inner peripheral surface of both the outer layer coating 12. As a result, an air layer 15 between the bellows tube 1 and the intermediate film 11 and an air layer 16 formed by the groove 14 provided on the inner peripheral surface of the outer film 12 are formed.
The layers of air layers 15 and 16 perform adiabatic heat retention of the fluid passing through the stainless bellows tube 1. In this case, the bellows concave portion 8 on the outer surface of the bellows tube becomes the air layer 15 communicating with the groove groove 13 of the intermediate film in the axial direction. Since the leaked fluid flows out, the leak of the bellows tube can be detected externally.

The intermediate coatings 2, 5, 11 and the outer coating 3,
In addition to vinyl chloride resin, soft synthetic resins such as polyethylene and polybutene can be used for 7 and 12. The size of the groove grooves 4, 6, 13 and 14 can be set to various sizes depending on the size of the stainless steel bellows tube and the use of the pipe. Further, the outer layer coatings 3, 7, 12 described above
It is also possible to provide an outermost layer coating by further providing an air layer on the outer peripheral surface of the above, and to provide three air layers in the outer peripheral direction of the metal bellows tube.

[0011]

As described above, the water supply and hot water supply transport pipe of the present invention is excellent in adiabatic and heat retaining action because the air layer is provided in plural layers on the outer surface of the metal bellows pipe made of copper or stainless steel. In addition, since each resin coating layer uses a soft resin material, the flexibility of the metal bellows tube is not impaired, and the pipe workability is also excellent. Moreover, since the groove grooves of the intermediate film and the outer film that form the air layer are formed along the pipe axis direction,
By extrusion molding, an intermediate coating and an outer coating can be easily provided, which is excellent in manufacturing.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a transportation pipe showing an embodiment of the present invention.

2 is a lateral cross-sectional view of FIG.

FIG. 3 is a longitudinal sectional view of a transport pipe showing another embodiment of the present invention.

4 is a lateral cross-sectional view of FIG.

FIG. 5 is a longitudinal cross-sectional view of a transportation pipe showing still another embodiment.

6 is a lateral cross-sectional view of FIG.

[Explanation of symbols]

 1 Metal bellows tube 2, 5, 11 Intermediate film 3, 7, 12 Outer layer film 4, 13 Outer layer film 3 Inner surface groove groove 6, 14 Intermediate film 5 Outer surface groove groove 8, 9, 10, 15, 16 Air layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaaki Ukaji 1043 No. 1 Shimoyama, Onigakebo, Tsukuba, Ibaraki Prefecture Inside Kumagai Technical Research Institute Co., Ltd. 1 Kumagai Gumi Research Institute Ltd.

Claims (1)

[Claims] 1. A metal bellows tube made of metal such as copper or stainless steel inside, and a plurality of layers of soft resin coated with an air layer extending along the tube axis on the outer peripheral surface of the bellows tube. A water supply and hot water supply transport pipe.