JPH09178058A - Hose for supplying cold and hot water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain the concentration of chlorine remaining in cold or hot water and to prevent odor or color by making the inner layer of an inner layer tube of a polyolefin resin and its outer layer of thermoplastic elastomer or thionation rubber having flexibility. SOLUTION: An inner layer tube 1 is composed of a polybdudenum resins layer or a bridge polyethylene resin layer as an inner layer 2 directly contacted with cold and hot water and a thermoplastic elastomer or thionation rubber layer as an outer layer 3, a cover is placed around the outer layer 3 and a braided reinforcing layer 4 is braided. An inner collar 11 is inserted into the diameter of a hose, an outer collar 12 is fastened temporarily (13) and thereby a metal fitting 10 is attached. Thus, a hose suitable for supplying cold and hot water and having a small reduction in remaining chlorine and a small bending force is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to water supply pipes and water supply systems.
The present invention relates to a hose suitable for hot water supply piping.

[0002]

2. Description of the Related Art Conventionally, hoses used for water supply piping
As a rubber sheet, EPDM rubber is used for the inner layer and a reinforcing layer is arranged on the outer periphery of the inner layer. However,
Hypochlorous acid is usually injected into tap water for sterilization, and a chlorine concentration of 0.1 ppm or more is required for maintaining the sterilization effect. Especially when it is used for water equipment, it is necessary that the tap water having the above-mentioned chlorine concentration is allowed to stay in the equipment and the residual chlorine content after 24 hours is kept at 50% or more of the initial value. .
It is also necessary that the stagnant water does not have an odor or color.

[0003]

However, when the hose having the above-mentioned structure is used for hot water supply, when the inner surface layer is made of EPDM rubber, chlorine is consumed by the rubber, organic substances, etc. The current situation is that it is difficult to satisfy. Also, when used for a long time, EPD due to the influence of chlorine
There is also a problem that the M-based rubber is likely to be attacked and become fragile. For this reason, a metal bellows tube is generally used especially for hot water supply piping, and it has been proposed to use a polybutene resin pipe in part. However, since these are hard and lack flexibility, they have the drawback of being inferior in handleability and workability.

The present invention solves these drawbacks, and an object of the present invention is to provide a hose which keeps the concentration of residual chlorine in water or hot water and prevents the odor and color from developing. The present invention proposes a hose which solves the difficulty of handling conventional bellows pipes and polybutene pipes.

[0005]

The structure of the present invention is a hose comprising at least an inner surface layer tube and a reinforcing layer surrounding the inner surface layer tube, the inner surface layer being a polyolefin resin layer. The present invention relates to a water / hot water supply hose, wherein the outer layer is a flexible thermoplastic elastomer or vulcanized rubber. And, the polyolefin resin of the inner layer is preferably a polybutene resin or a crosslinked polyethylene resin having a thickness of 0.03 to 0.5 mm, preferably 0.05 to 0.5 mm, and the reinforcing layer has a thickness of 0.2 to
A braided layer using a soft or hard stainless steel wire having a thickness of 0.4 mmΦ, or a braided layer of synthetic fibers or a spiral wound layer is preferable. An outer surface layer for protecting the reinforcing layer, such as a thermoplastic synthetic resin layer, may be provided on the outer periphery of the reinforcing layer to provide a water supply / hot water supply hose.

In the hose of the present invention, the inner surface layer
While maintaining the concentration of residual chlorine in the inner layer of the bush, it prevents odors, colors, etc. from being attached and has appropriate flexibility as a hose, and the hose that is in direct contact with water or hot water Polyolefin resin is placed in the inner layer, and a flexible material is placed on the outer side, and a reinforcing layer is placed around them to further improve flexibility while maintaining the required properties for water and hot water. It is a hose with improved handleability.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in more detail. Examples of the polyolefin resin as the inner layer forming the inner surface layer tube include:
Examples thereof include resins such as cross-linked polyethylene and polybutene. Further, as the thermoplastic elastomer as the outer layer, a thermoplastic elastomer having flexibility such as polystyrene type, polyolefin type, polyurethane type, polyester type, polyamide type, ethylene-vinyl acetate type, chlorinated polyethylene type, etc. Depending on the type, vinyl chloride or polyethylene may be used. Also, as a vulcanized rubber, E
PDM, fluororubber, acrylic rubber, butyl rubber, NB
Examples include R-based rubber and the like. Each of the inner layer and the outer layer is then extruded at the same time to form a two-layer inner surface tube. When vulcanized rubber is used for the outer surface, the unvulcanized rubber layer is extruded after the inner layer resin is extruded, and then vulcanization is performed.

Then, a reinforcing layer is laminated on the inner surface layer tube, for example, a soft stainless wire having a diameter of 0.23 mmΦ is mixed and used as a reinforcing layer by using a knitting machine. As another example of this reinforcing layer, for example, in a hose used when the pressure is low, synthetic fibers such as vinylon, polyester, nylon, and aramid fibers are used for braiding and spiraling. It can be wound into a shape and reinforced.

These reinforcing layers may be the hose exposed as they are, but it goes without saying that an outer surface layer may be further formed on this reinforcing layer. By forming the outer surface layer, dust and dirt hardly adhere to the surface of the hose, and the surface can be easily cleaned. In some cases, it may be necessary for design harmony with surrounding equipment to be used, and for example, a colorful hose may be provided. As the outer layer, for example, a vinyl chloride resin or the same thermoplastic elastomer as the outer layer of the inner layer tube as described above can be used.

[0010]

EXAMPLES The hose of the present invention will be described in more detail with reference to specific examples. In Example 1, a polybutene resin (Buron P5050 manufactured by Mitsui Petrochemical Co., Ltd.) was used as the material for forming the inner layer of the inner surface tube, and a thermoplastic elastomer (Rheostomer manufactured by Riken Vinyl Industry Co., Ltd.) was used as the material for the outer layer. A two-layer tube was obtained by extrusion molding using-).

In Example 2, a cross-linked polyethylene resin (Rinkloin, XHE740.N manufactured by Mitsubishi Chemical Co., Ltd.) was used as a material for forming the inner layer of the inner surface tube, and Santoprene (a thermoplastic elastomer) was used as the outer layer material. A two-layer tube was obtained using the grade 201-73). Hot water at 80 ° C. was allowed to flow in the tube for about 6 hours to crosslink polyethylene.

The thickness of each layer is shown in Table 1. Then, in Examples 1 and 2, six bobbins were combined with 0.23 mmΦ soft stainless wire around the outer circumference of this tube, and 24
Each bobbin was knitted as a reinforcing layer using a knitting machine. The inner diameter of the obtained hose is 9.5 mm, and the outer diameter is 13.
It was 5 mm.

(Flexibility test) A bending force test was carried out to compare the flexibility of the hose, that is, the handleability and workability. In this bending force test, the force when the hose was bent to have a radius of 100 mm and 50 mm was measured with a spring calibrator. The measurement results are shown in Table 1 and Table 2.
Shown in

(Residual chlorine test) The residual chlorine test is a residual chlorine measuring instrument using orthotolidine (manufactured by Shibata Kagakuki Kogyo Kogyo).
It measured using. The outline of this measuring method is as follows. Water having a chlorine concentration adjusted to 1 ppm with sodium hypochlorite is allowed to stagnant in the hose, and the chlorine concentration after 24 hours is measured by the above method, and the weight loss ratio is calculated. It is shown in. Tables 1 and 2 show the measurement results.

[0015]

[Table 1]

[0016]

[Table 2]

The hose actually used for supplying water and hot water is
It is necessary to easily bend the bending radius to about 50 mm, and the bending force is preferably 1000 g or less. As can be seen from Tables 1 and 2, it can be seen that when the thickness of the polybutene resin layer or the crosslinked polyethylene resin layer exceeds 0.5 mm, the polybutene resin layer or the crosslinked polyethylene resin layer becomes hard and difficult to bend and the handleability becomes poor.

On the other hand, the reduction of residual chlorine is greatly influenced by the thickness of the inner layer, that is, the polybutene resin layer or the crosslinked polyethylene resin layer, and it is necessary that this layer is at least 0.03, preferably 0.05 mm or more. It

FIG. 1 is a partially cutaway perspective view of the hose obtained in this example, in which 1 is an inner layer tube, and 2 is an inner layer which is in direct contact with water or hot water. The outer layer formed on the outer side of the polybutene resin layer or the crosslinked polyethylene resin layer 3 is a thermoplastic elastomer or vulcanized rubber. The outer layer 3 is surrounded and the reinforcing layer 4 is knitted. Of course, the above-mentioned outer layer can be formed on the reinforcing layer 4.

FIG. 2 is a partially cutaway side view when the joint metal fitting 10 is attached using this hose. The inner collar 11 is inserted into the diameter of the hose and the outer collar 12 is added. Tighten (1
The metal fitting 10 is attached by 3). The hose to which this joint fitting 10 was attached was tested for withstand pressure and repeated pressure. The withstand pressure was 120 kgf /
cm ^2, and a result of performing a repeated pressure test repeated pressurization 0~17.5kgf / cm ² at about 20 second intervals 1
A hose that could be used practically without any abnormality was obtained after 0,000 times.

[0021]

As described above, the present invention can provide a hose suitable for water supply and hot water supply with a small amount of residual chlorine reduction and a small bending force.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a hose according to the present invention.

FIG. 2 is a partially cutaway side view of the hose of the present invention to which a fitting is attached.

[Explanation of symbols]

 1 ... Inner surface tube, 2 ... Inner layer, 3 ... Outer layer, 4 ... Reinforcing layer, 10 ... Fitting metal fitting, 11 ... Inner color, 12 ... Outer color, 13 ... Caulking Department.

Claims (7)

[Claims] 1. A hose comprising at least an inner surface layer tube and a reinforcing layer surrounding the inner surface tube, wherein the inner surface layer tube has a polyolefin resin layer as an inner layer and a flexible layer as an outer layer. A hose for supplying water and hot water, which is a thermoplastic elastomer having or a vulcanized rubber. 2. The water supply / hot water supply hose according to claim 1, wherein the polyolefin resin forming the inner layer is a polybutene resin or a crosslinked polyethylene resin. 3. The water supply / hot water supply hose according to claim 2, wherein the polybutene resin layer or the crosslinked polyethylene resin layer has a thickness of 0.03 to 0.5 mm. 4. The water / hot water supply hose according to claim 1, wherein the reinforcing layer is a braided layer of soft or hard stainless steel fine wire. 5. The water supply / hot water supply hose according to claim 4, wherein the thin wire has a thickness of 0.2 to 0.4 mmΦ. 6. The hot and cold water supply hose according to claim 1, wherein the reinforcing layer is a braided layer of synthetic fibers or a spiral wound layer. 7. The water supply / hot water supply hoe according to claim 1, wherein an outer surface layer for protecting the reinforcing layer is provided on the outer periphery of the reinforcing layer.
Su.