JPH04323027A - Bent hose or pipe provided with heat insulation material and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a bent hose or pipe of being light weight in comparison with ones made of metal, having no occurrence of harmful or poisonus fluid at the time of burning, being unnecessary for heat insulation construction and easy for piping construction, moreover, having no dissolution of organic components even in flowing drinking water, and being excellent in sanitary. CONSTITUTION:A bent hose or pipe is manufactured such that rubber layer 2 is formed on the outer surface of olefine resin layer of PTFE, high molecular weight PE, HD-PE, PP, polybutene and the like, and on the outer surface of the foregoing rubber layer 2, a sponge rubber layer 3 is formed respectively, and further a joint-fitting 4 for the rubber hose is connected to the end part thereof.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to bent hoses or pipes for passing hot water obtained from solar water heaters, electric water heaters, etc., and for piping of automobile air conditioners, and a method for manufacturing the same.

0002

[Prior Art] Conventionally, as a water hose or pipe,
Solar water heaters, electric water heaters, etc. use rubber, PVC, copper, etc.
Further, in automobile air conditioners, metal thermal conductors such as aluminum, copper, etc. are used.

[0003]When used for drinking water in solar water heaters, electric water heaters, etc., rubber hoses have the advantage of being easy to bend and easier to pipe and process than outdoors. Potassium acid consumption may exceed the permissible limit, PVC hoses are no longer needed,
If you try to incinerate it, it will generate harmful and poisonous chlorine-based fluids, and hoses made of all materials require fittings at bends, and insulation materials must be wrapped on site after piping is completed. There are problems such as the need for extra manpower. In addition, when used in the piping of automobile air conditioners, a flange is welded to the end, and heat- and cold-resistant EPT sponge rubber is made and fitted in order to insulate heat and cold, but the flange diameter is the same as the pipe diameter. Since the thickness is set to 3 to 5 times, it is difficult to fit in, and there is a problem in that it is necessary to foam on site.

0004

[Problem to be solved by the invention] The problem to be solved is that conventional solar water heaters, electric water heaters, etc. may generate substances harmful to health and safety during and after use. , it is necessary to separately wrap insulation material on-site, joints are required at bent parts, which requires extra manpower, and in the case of automobile air conditioners, it is difficult to fit insulation sponge rubber into pipes. It is.

[0005]

[Means for solving the problem] The first invention is based on PTFE.
・Rubber layer 2 on the outer surface of olefin resin layer 1 such as ultra-high molecular weight PE, HD-PE, PP, polybutene, etc.
It is a curved hose or pipe which has a sponge rubber layer 3 formed on its outer surface and a rubber hose fitting 4 connected to its end.

[0006] The second invention is a step of co-extruding rubber with the olefin resin of the first invention to form a two-layer straight pipe consisting of two layers, an olefin resin layer 1 and a rubber layer 2, in order from the inside. a step of fitting a heat-shrinkable heat-shrinkable heat-insulating tube made of sponge rubber into the outer surface of the two-layer straight pipe to form a three-layer straight pipe consisting of the two layers of the straight pipe and the sponge rubber layer 3;
A rubber hose joint fitting 4 is connected to the end of the layered straight pipe, preheated to a predetermined temperature for a predetermined time, and inserted into a bending mold.
This method of manufacturing a bent hose consists of injecting fluid into a layered straight pipe, bending it, cooling it, and fixing the bend.

[0007] In the third invention, two layers of rubber and sponge rubber are extruded on the olefin resin of the first invention, and three layers, olefin resin layer 1, rubber layer 2, and sponge rubber layer 3, are formed sequentially from the inside. Step 3 of forming a three-layer straight pipe
A step of continuously vulcanizing the layered straight pipe, and a second step after these steps.
This is a method of manufacturing a bent hose that performs the same process as the invention of .

[0008] The fourth invention is the first invention except for the step of co-extruding solid rubber and sponge rubber onto the olefin resin pipe of the first invention, and the step of three-dimensionally bending it in a three-dimensional bending mold. This is a bent pipe manufacturing method that performs the same process as in the invention No. 3.

[0009]

[Embodiment] First, the case of using a solar water heater, an electric water heater, etc. for supplying drinking water will be explained with reference to a drawing.A bent hose is, for example, one that is bent two-dimensionally into an L-shape.
Innermost layer of PTFE, ultra-high molecular weight PE, HD-PE, PP
- Consists of an olefin resin layer 1 such as polybutene, an intermediate rubber layer 2, and an outermost sponge rubber layer 3, and a rubber hose fitting 4 is connected to the end thereof.

[0010] There are two types of manufacturing methods:
The manufacturing method is to first co-extrude rubber to the olefin resin, and then form an olefin resin layer 1 and a rubber layer 2 in order from the inside.
Make a two-layer straight pipe consisting of two layers. Next, a heat-shrinkable heat-shrinkable heat-insulating tube made of sponge rubber is fitted onto the outer surface of the two-layer straight pipe to form a three-layer straight pipe made of the two layers of the straight pipe and the sponge rubber layer 3. Furthermore, after connecting the rubber hose fitting 4 to the end of the three-layer straight pipe, for example, when using ultra-high molecular weight PE, preheat it at 200 degrees for 2 minutes, insert it into a bending mold, and insert it into the three-layer straight pipe. A fluid made of gas or liquid such as air or nitrogen is injected, and after bending and forming, it is cooled and the bend is fixed.

[0011] The second manufacturing method is to extrude two layers of rubber and sponge rubber on the olefin resin, and sequentially from the inside,
Olefin resin layer 1, rubber layer 2 and sponge rubber layer 3
Make a 3-layer straight pipe consisting of 3 layers. Next, after continuously vulcanizing the three-layer straight pipe, the same treatment as in the second invention is performed.

[0012] Next, the case where it is used for the piping of an automobile air conditioner will be explained with reference to a drawing.The bent pipe is three-dimensionally bent, and like the bent hose, the innermost layer is made of PTFE, ultra-high molecular weight PE, It consists of an olefin resin layer 1 such as HD-PE/PP/polybutene, an intermediate rubber layer 2, and an outermost sponge rubber layer 3, and a rubber hose fitting 4 is connected to the end thereof.

[0013] The manufacturing method is to co-extrude solid rubber and sponge rubber onto the olefin resin pipe to make a three-layer straight pipe, and after continuous vulcanization of the three-layer straight pipe, a second manufacturing process of a bent hose is performed. The same process as the method is performed, but the bending is performed three-dimensionally in a three-dimensional bending mold.

[0014] If necessary, only rubber is coextruded with the olefin resin to form a two-layer straight pipe consisting of two layers, an olefin resin layer 1 and a rubber layer 2, in order from the inside, and vulcanization is performed. After dimensional bending, a heat-shrinkable heat-shrinkable heat-insulating pipe made of sponge rubber may be fitted onto the outer surface of the curved tube, and after shrinkage, the rubber hose fitting 4 may be connected to the end of the curved tube.

[0015] To explain the function, both aluminum and
Compared to metal hoses such as copper, they are lightweight, do not generate harmful or toxic fluids such as chlorine-based fluids when incinerated, and have already formed a heat insulating layer. Since the fitting is connected, there is no need to perform insulation work on site, and the connection with the base is easy, making piping work easier, helping to save manpower, and also for use with solar water heaters, electric water heaters, etc. The bent hose for water does not elute organic components in the rubber and satisfies Ministry of Health and Welfare Notification No. 20.

[0016]

[Effects of the Invention] Since the present invention is configured as described above,
It is lighter than metal products, does not generate harmful or toxic fluids when incinerated, does not require insulation work, and is easy to construct piping.
Furthermore, even when drinking water is passed through it, no organic components are leached out, making it hygienic.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing a second embodiment of the invention.

FIG. 3 is a cross-sectional view of FIG. 2;

[Explanation of symbols]

1 Olefin resin layer 2 Rubber layer 3 Sponge rubber layer 4 Rubber hose fittings

Claims (4)

[Claims] [Claim 1] PTFE, ultra-high molecular weight PE, HD-PE,
A rubber layer (2) is formed on the outer surface of the olefin resin layer (1) such as PP/polybutene, and a sponge rubber layer (3) is formed on the outer surface of the rubber layer (2), and a rubber hose fitting ( 4) A bent hose or pipe that connects. [Claim 2] PTFE, ultra-high molecular weight PE, HD-PE,
Step 2 of co-extruding rubber with olefin resin such as PP/polybutene to form a two-layer straight pipe consisting of two layers: olefin resin layer (1) and rubber layer (2) in order from the inside.
A heat-shrinkable heat-shrinkable heat-insulating tube made of sponge rubber is fitted onto the outer surface of the layered straight pipe to form the two-layered straight pipe and the sponge rubber layer (3).
A step of forming a three-layer straight pipe consisting of a three-layer straight pipe, connecting a rubber hose fitting (4) to the end of the three-layer straight pipe, preheating it to a predetermined temperature for a predetermined time, inserting it into a bending mold, A bent hose manufacturing method that involves injecting fluid into a layered straight pipe, bending it, cooling it, and fixing the bend. [Claim 3] PTFE, ultra-high molecular weight PE, HD-PE,
Two layers of rubber and sponge rubber are extruded onto an olefin resin such as PP/polybutene, and a three-layer straight layer consisting of the olefin resin layer (1), rubber layer (2), and sponge rubber layer (3) is formed sequentially from the inside. A process of forming a pipe, a process of continuously vulcanizing the three-layer straight pipe, and connecting a rubber hose joint fitting (4) to the end of the three-layer straight pipe, preheating it to a specified temperature for a specified period of time, and forming a bent metal pipe. A method for manufacturing a bent hose that involves inserting it into a mold, injecting fluid into a three-layer straight pipe, bending it, cooling it, and fixing the bend. Claim 4: PTFE, ultra-high molecular weight PE, HD-PE,
Solid rubber and sponge rubber are co-extruded into a pipe made of olefin resin such as PP and polybutene, and the pipe is made from the inside.
A step of forming a three-layer straight pipe consisting of three layers: an olefin resin layer (1), a rubber layer (2), and a sponge rubber layer (3);
The process of continuously vulcanizing the 3-layer straight pipe, connecting the rubber hose joint fitting (4) to the end of the 3-layer straight pipe, preheating it to a specified temperature for a specified time, and vulcanizing it in a 3-dimensional bending mold. A method for manufacturing bent pipes that involves dimensional bending, cooling, and fixing the bend.