JPH11280957A - Water supply and hot-water supply hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce occurrence of kink by providing a hose comprising an inner surface layer tube formed by at least one or more layers of synthetic resin or rubber elastic material with a spring embedded in the interior thereof, and a reinforcement layer surrounding the outer periphery thereof. SOLUTION: Thermoplastic elastomer is taken as an inner surface layer tube 1, a metallic spring 2 is continuously put in a head of an extruder, thermal elastomer material is extruded from the inside and the outside, and further a braided layer 3 of a stainless soft wire is provided on the outside. As the spring 2, mainly a metallic one is preferably used, and desirably the wire diameter ranges from 0.3 mm to 1.2 mm. Thus, the spiral, preferably metallic spring is embedded in the inner surface layer tube, whereby the circumferential rigidity of the hose is remarkably increased. Accordingly, the flexibility of the hose is not damaged, and even if the hose is bent, deformation of the hose can be prevented and occurrence of kink can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hose for water supply and hot water supply with reduced occurrence of kinks.

[0002]

2. Description of the Related Art Metal hoses and pipes have been used as hoses for water supply and hot water supply, and pipes partially made of resin have also been used. These metal pipes, resin pipes, and the like have a drawback that the material constituting them is hard and poor in flexibility, so that there is a problem that pipe workability is inferior.

In order to solve the problem of poor flexibility, a tube made of a material such as EPDM rubber or thermoplastic elastomer is used as an inner tube, and pressure is applied to water or hot water in a hose. In such a case, a structure in which a braided layer of a stainless wire, a multifilament fiber, and a monofilament fiber is arranged on the outer periphery of the tube is used.

However, when sufficient EPDM rubber or thermoplastic elastomer does not provide sufficient chlorine water resistance, for example, under a use condition such as passing high-temperature hot water continuously for a long time, a polyolefin resin or a thermoplastic resin is used. A material having excellent chlorine water resistance such as a fluorine resin is used for the water contact layer, and a flexible material such as a vulcanized rubber or a thermoplastic elastomer is used outside the tube, and two or more layers of tubes are used. Is preferred.

As described above, the hose having flexibility is excellent in piping workability. On the contrary, when the hose bends to some extent due to its flexibility, a kink (buckling) is formed. -A sharp bending phenomenon may occur. When the hose is in a kink state, the inner diameter of the hose becomes smaller, the required flow rate of water or hot water flowing in the hose cannot be obtained, and the pressure loss in the hose increases. Occurs. Since the kink portion is under stress, there is a problem in that the portion is deteriorated faster than the normal portion when used with the kink.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks of the conventional hose, and relates to a hose for water supply and hot water supply which has reduced kink generation and is flexible.

[0007]

SUMMARY OF THE INVENTION The gist of the present invention is to provide an inner layer tube made of at least one layer of a synthetic resin or rubber elastic material and having a spring embedded therein, and a reinforcing layer surrounding the outer layer tube. , Wherein the spring is usually made of metal, and the wire diameter of the spring is 0.3 to 1.2 mm.
Water supply / hot water supply hose.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The hose of the present invention is an inner surface layer tube having at least one layer of a material, in which a spring is helically embedded, and having a reinforcing layer outside. By embedding a helical spring in the inner layer tube, the spring can significantly increase the circumferential rigidity of the hose. Even if you bend this spring
This has the effect of preventing deformation of the fabric and preventing kink.

Although the above-mentioned spring is made of synthetic resin, a metal spring is preferably used, and its wire diameter is preferably in the range of 0.3 mm to 1.2 mm. If the wire diameter of the spring is less than this range, the kink preventing effect cannot be obtained because the circumferential rigidity of the hose cannot be sufficiently increased. On the other hand, if the wire diameter exceeds this range, the spring will be hard and will be insufficient as a hose. Flexibility cannot be obtained.

As the spiral spring material, it is preferable to use a spring steel material as shown in JIS G4801, but it is preferable to use a cold spring material such as a piano wire, a hard steel wire, a stainless steel wire, and an oil-tempered wire. A material having spring performance by cold working and heat treatment may be used.

As a material of the inner surface layer tube, EPDM is used.
A single-layer tube made of a rubber or a thermoplastic elastomer may be used, or a material having excellent water resistance to chlorine, such as a polyolefin resin or a fluororesin, may be used for the water-contacting layer, and flexibility may be provided on the outside. A tube having two or more layers using a material such as a vulcanized rubber or a thermoplastic elastomer may be used.

As a method of embedding the spring in the inner layer tube, the spring may be manufactured by extruding the inner layer material simultaneously from the inside and the outside of the spring by putting the spring into an extruder of a material forming the tube. It may be manufactured by extruding a part of the inner layer material, and then extruding the remaining inner layer material after winding a spring.

The reinforcing layer has a wire diameter of 0.2 to 0.4 m.
It is preferably provided as a braid layer of a soft or hard stainless steel thin wire having a thickness of m, but a multi-monofilament or monofilament of synthetic fibers may be used as the braid layer.

An outer layer may be further formed on the outer side of the reinforcing layer for the purpose of facilitating cleaning of the hose surface, making a colorful hose, and the like. −
It is possible to use the materials listed as the material of the metal or vinyl chloride resin.

According to the present invention, by embedding a metal spring, which is preferably in a spiral state, in the inner surface layer tube, the circumferential rigidity of the hose is significantly increased by such a spring. Therefore, even if the hose is bent without deteriorating the flexibility of the hose, the hose can be prevented from being deformed, and a kink can be prevented from being generated.

[0016]

The present invention will be described in more detail with reference to the following examples. FIG. 1 is a side view of a hose for water supply / hot water supply according to the present invention, wherein a part of the hose is cut away, 1 is an inner tube, and 2 is a helical metal spring embedded in the inner tube. , 3
Is a reinforcing layer surrounding the inner tube 1.

In Examples 1 to 3 and Comparative Examples 1 and 2, a thermoplastic elastomer (Santoprene 201-73 manufactured by AES Japan) was used as the inner surface layer tube 1. This tu
The inner diameter of the tube 1 was 9 mm, and the thickness of the tube 1 was 1.5 mm. The tube 1 was formed by continuously placing the metal spring 2 in the extruder head and extruding the thermoplastic elastomer material from the inside and outside of the metal spring 2. Further, a braided layer 3 of a soft stainless steel wire (Φ0.22 mm) was provided on the outside.

In Examples 4 to 6 and Comparative Examples 3 and 4, a polybutene resin (Bulon P5050 manufactured by Mitsui Chemicals, Inc.) was used as a material for forming the inner layer of the inner layer tube 1.
Thermoplastic elastomer is used as the material forming the outside
(Santoprene 201-73 manufactured by AES Japansha). The inner diameter of the tube 1 was 9 mm, the wall thickness was 0.2 mm, and the thickness of the outer layer was 1.3 mm. As a method for forming such a tube 1, a polybutene resin as an inner layer material is extruded, a metal spring 2 is wound thereon, and a thermoplastic elastomer of an outer layer is extruded to further extrude the inner layer tube. 1 was obtained. The other materials of the metal spring 2 and the reinforcing layer 3 were the same as those in the first and second embodiments.

A hose bending test was performed to examine hose flexibility, which is an index of the workability and installation workability of the hose. This means that the sample hose has a radius of 100 mm and 5 mm.
It is measured by a load sensor necessary when bending to 0 mm.

The following test was conducted to examine the kink properties of the hose. A sample having a hose free length of 90 mm is bent, and the bending radius and the bending force at that time are measured. The bending force increases as the bending radius decreases, but the bending force decreases when the hose kinks. In this way, it was confirmed that the kink measured from the bending force and the kink point visually observed coincided, and the bending radius (mm) at that time was evaluated as the kink point.

Tables 1 and 2 show the configurations of the hoses of the examples and comparative examples, and the results of the hose bending test (flexibility test) and the kink point measurement test.

[0022]

[Table 1]

[0023]

[Table 2]

The hose used for water supply and hot water supply needs to be bent to a bending radius of about 50 mm, and the bending force is preferably not more than 1000 g, and this was determined based on this. However, as can be seen from the table, in the case of Comparative Examples 2 and 4, the wire diameter of the metal spring 2 was larger than 1.2 mm, and it was found that the required flexibility as a hose could not be obtained.

The kink point of the hose for water supply / hot water supply is preferably a bending radius of 25 mm or less, which was used as a criterion. However, as in Comparative Examples 1 and 3, when the wire diameter of the metal spring 2 was If it is 0.3 mm or less, the kink bending radius becomes 30 mm, and it is understood that the kink preventing effect required as a hose cannot be obtained.

[0026]

The present invention has been described above. By inserting a metal spring into the inner layer tube, the circumferential rigidity of the hose is significantly increased by the spring. Even if the hose is bent without impairing the flexibility, the spring can prevent deformation of the hose and provide a hose having an effect of preventing kink.

[Brief description of the drawings]

FIG. 1 is a side view of a hose for water supply / hot water supply according to the present invention, with a part cut away.

[Explanation of symbols]

 1 ‥‥ inner tube tube, 2 ‥‥ spiral metal spring, 3 ‥‥ reinforcement layer surrounding the inner tube.

Claims (3)

[Claims] 1. A water supply / water supply system comprising at least one or more layers of a synthetic resin or rubber elastic material, an inner layer tube having a spring embedded therein, and a reinforcing layer surrounding the outer layer tube. Hot water supply hose. 2. The hose for supplying water and hot water according to claim 1, wherein the spring is made of metal. 3. The wire diameter of the spring is 0.3 to 1.2 mm.
The hose for supplying water / hot water according to claim 1, wherein