JPS6143598B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insulating rubber hose, particularly an insulating hose that has excellent heat resistance, elasticity, weather resistance, etc., and is suitable as a hose for a solar collector.

Conventionally, for example, the insulated hoses built into solar collectors that flow heat media of 100℃ or higher have been made of EPDM, IIR,
General-purpose rubbers such as NBR, AR, ECO, and SEP are often used. In addition, for connections with heat collectors that are exposed to the atmosphere, the above-mentioned general-purpose rubber, the outer surface of which is covered with an outer layer of hemp, etc., or flexible joints made of metal such as copper, stainless steel, or aluminum, are used. It is used. Furthermore, silicone rubber hoses are also used as hoses for flowing high-temperature heat medium.

However, recent improvements in the heat collection efficiency and suppression of radiant heat loss in solar collectors have been remarkable, and for example, hoses used in anti-convection solar collectors need to be able to withstand temperatures of 180°C or higher, General-purpose rubber hoses can only withstand temperatures of around 150℃, and do not have a sufficient lifespan.

In addition, when a general-purpose rubber hose is coated with hemp, in addition to its low high temperature resistance, hemp also has poor weather resistance, making it impossible to achieve a sufficiently long life.

In addition, when using metal flexible joints,
There is little flexibility in terms of length, etc., which tends to cause inconvenience at the solar collector installation site, and there is also concern about corrosion, including pitting corrosion, due to high temperature water and steam. In addition, it also has the disadvantage of being expensive.

The present invention has been developed in view of these circumstances, and is capable of long-life use even at high temperatures of 180°C or higher, does not lose the shape of the braided reinforcing layer, and has excellent weather resistance and heat insulation properties. It is an object of the present invention to provide an insulating hose that is excellent in performance, is low in cost, and is particularly suitable for being built into or connected to a solar collector.

In order to achieve such an objective, the present invention
A braided reinforcing layer made of polyester fiber is integrally wrapped around the inner rubber layer, and an intermediate rubber layer made of the same material as the inner rubber layer is provided on the outside of the layer with a silicone primer layer interposed therebetween. The structure includes a heat insulating layer made of rubber foam.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. The manufacturing procedure will be explained below.

First, the inner layer rubber 1 made of methyl vinyl silicone rubber is formed. This is made by extruding the core part by inserting a mantle into a scouring cylindrical material. As a result, the inner rubber layer 1 can withstand constant use at temperatures of 180° C. or higher and has sufficient ultra-heat resistance, chemical resistance, and water vapor resistance for use in solar collectors. The outer periphery of this inner rubber layer 1 is covered with a braided reinforcing layer 2 made of heat-resistant polyester fiber. In addition, if the heat-resistant polyester fiber is simply wrapped, the braid (braided reinforcement layer 2) will be damaged due to repeated expansion and contraction.
Due to the incompatibility between rubber and rubber, the shape will be distorted and the strength will be reduced, so a silicone-based primer 3 is attached to the surface of the polyester fiber to make it adhere tightly. This makes it possible to fully satisfy both durability and heat resistance. That is, the silicon-based primer layer 3
The fibers of the braided reinforcing layer 2 are in close contact with each other and are restrained by the adhesiveness of the primer, so even if the insulating hose is bent, the fibers and the entire hose move together, and the shape of the braided reinforcing layer 2 does not collapse. , it is possible to prevent the fibers from becoming uneven. On the outside of the primer layer 3, there is provided an intermediate rubber layer 4 made of the same methyl vinyl silicone rubber having weather resistance and super heat resistance. Further, the outermost layer is provided with a heat insulating layer 5 made of rubber foam such as EPDM to provide heat insulation and flexibility. After this, the mantle is removed and cut to a predetermined length. Note that it is also possible to use glass fiber for the blade, but in this case, the durability against repeated pressurization becomes weak. Therefore, in order to deal with this problem, the glass fiber and the rubber may be brought into close contact with each other using a primer. Note that since glass fiber has a low pressure resistance cycle, if a high degree of reliability is required, it is desirable to use polyester fiber as in the above embodiment. This dramatically improves reliability.

Furthermore, when simply using polyester fibers, the shape collapses due to the incompatibility between the blade and the rubber due to repeated expansion and contraction, and the strength decreases. If so, the adhesion can be improved and the durability and heat resistance can be fully satisfied.

As described above, it has become clear that according to the present invention, the following effects can be achieved.

(1) It has high heat resistance and is expected to have a long life of more than 40,000 hours even when used at a constant temperature of 180°C.

(2) It is weather resistant and does not crack or increase in hardness even when exposed to the atmosphere.

(3) High pressure resistance with pressure resistance of 30Kg/cm ² or more.

(4) High water vapor resistance.

(5) Low compression set and less loosening of tightening bands due to aging.

(6) It has excellent chemical resistance, and there is no problem in using fluids other than water, such as propylene glycol, ethylene glycol, and heat transfer fluids containing various inhibitors.

(7) There is no hygienic problem even if the hot water for hot water supply is directly poured.

(8) Resistance to expansion and contraction due to repeated pressure (0 to 6 Kg/cm ² ) will not rupture even after 200,000 cycles or more.

(9) Rubber foam insulation is used for the outer layer, which provides excellent insulation and sufficient flexibility.

[Brief explanation of the drawing]

The figure is a sectional view showing one embodiment of the present invention. 1... Inner layer rubber, 2... Braided reinforcement layer, 3... Primer layer, 4... Intermediate rubber layer, 5... Heat insulation layer.

Claims (1)

[Claims] 1. A braided reinforcing layer made of polyester fiber wrapped around a hollow inner rubber layer, and an intermediate rubber layer made of the same material as the inner rubber layer provided on this braided reinforcing layer via a silicone primer layer. A heat insulating hose comprising: a heat insulating layer made of a rubber foam formed outside the intermediate rubber layer.