JP2001056073A - Very high pressure hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability by providing a very high pressure hose formed by an inner pipe of polyketone resin, and plural reinforcing layers formed on the outer periphery of the inner pipe, and further forming a covering. SOLUTION: An inner pipe 10 is formed by polyketone resin such as polyeter ketone, polyaryl eterketone, polyketone and the like, and a high tension steel wire 11 is wound in six layers 11a, 11b, 12a, 12b, 13a, 13b on the inner pipe 10. Further, on the surface where the high tension steel wires 11a, 11b, 12a, 12b, 13a, 13b are stacked, a nylon resin layer as a covering 14 is formed to obtain a very high pressure hose. Thus, breaking strength, fatigue resistance to deformation due to elongation at the time of breaking and repetition of pressurization, strength to deformation due to caulking, and resistance for water pollution can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrahigh pressure hose and an inner tube material of a high pressure hose used for fluid water and gas.

[0002]

2. Description of the Related Art An ultra-high pressure hose usually has a structure in which a steel wire is spirally wound on a resin inner tube. The number of reinforcing layers depends on the specifications of the hose. Four to eight layers.

In such an ultra-high pressure hose, since the pressure applied to the hose is high, the inner pipe used needs to have a certain strength to prevent a pinhole generated from a gap between the reinforcing wires. However, demanding high strength for the inner tube made of a resin material generally leads to an increase in hardness, which leads to a decrease in elongation at break. Therefore, a high-strength material cannot withstand deformation due to the crimping of the metal fittings in particular, so that the assembly performance (the performance of the crimping portion of the metal fittings) cannot be secured, and the bending rigidity of the hose itself also increases, resulting in poor usability. In addition, deformation due to repeated actual use pressurization, that is, a small crack called fatigue crack occurs due to expansion of the inner diameter of the inner tube, fluid leaks from the crack, and it tends to be broken not by the life of the reinforcing layer but by the life of the inner tube Is high.

For the above reasons, it is important to select an inner tube material in an ultrahigh pressure hose, and a polyoxymethylene resin material (POM) is generally used. However, such a POM resin still has a problem which cannot be said to have solved the conventional problem. That is, although it is satisfactory in terms of the strength of the inner tube, it is currently used under the potential problems of assembly performance, increase in bending stiffness, generation of fatigue cracks, and the like. In the case where a POM resin is used, the life under actual use pressure is about 500 hours.

[0005] In addition, even in the case of a high-pressure hose using fluid water and gas other than ultrahigh pressure, there is a problem in that the inner tube made of rubber has a problem of permeation of the inner tube of the fluid. Deterioration by water and gas and permeation of gas may occur.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the drawbacks of conventional ultra-high pressure hoses and high pressure hoses for fluid water and gas, and select a special resin material for the inner tube material. This solves the problem.

[0007]

The present invention has the following configuration to solve the above problems. That is, an ultrahigh pressure hose in which an inner tube and a plurality of reinforcing layers are formed on the outer periphery of the inner tube, and furthermore, an outer cover is formed, wherein a polyketone resin (PK) is used as an inner tube material. It involves a super high pressure hose. As the reinforcing layer of the ultrahigh pressure hose, preferably, four or more steel wire layers are wound. In the definition of the present invention,
The ultra-high pressure hose includes a high pressure hose used for transferring fluid water and gas as described above.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The inner tube used for an ultra-high pressure hose is an aromatic or aliphatic PK resin, and the polyketone resin includes polyetheretherketone (PEEK.
VICTREX), polyallyl ether ketone (P
EAK / BASF), polyketone (PK / AMOC)
O, SHELL).

For example, in the case of polyetheretherketone (PEEK), which is a typical example of PK resin, heat resistance,
Excellent in chemical resistance, injection moldability, high rigidity, and high elongation. By using this resin for the inner tube of an ultra-high pressure hose, it can withstand breaking strength, elongation at break, and fatigue resistance to deformation due to repeated pressurization. Properties, strength against deformation due to caulking, and an inner pipe with excellent resistance to water alteration.In addition, by using the inner pipe of a high-pressure hose that uses fluid water and gas, water alteration resistance, An inner tube having gas barrier resistance can be provided.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The ultra high pressure hose of the present invention will be described in more detail with reference to embodiments. FIG. 1 is a partially cut perspective view of an ultra-high pressure hose of the present invention, in which an aliphatic polyketone is used as an example of a PK resin, and high tension steel wires-1a, 1b, 2a, 2b, 3a are provided on an inner tube 10. 3b (six layers) was wound, and a nylon resin layer was formed as a jacket 11 on the surface to obtain an ultrahigh pressure hose. Although not shown, a polyester resin layer was wound as an intermediate layer between the respective layers.
The structure of such an ultra-high pressure hose is as follows: inner pipe size: inner diameter 8.5 m
m, outer diameter 10.5 mm, wire diameter of reinforcing layer: 0.3
8 mm and the outer diameter of the hose was 17.3 mm.

(Test 1 to Impulse test) The ultrahigh pressure hose was attached to a tester with a minimum bending radius, and a predetermined pressure was repeatedly applied to measure the number of times of occurrence of an abnormality such as breakage or fluid leakage. That is, by performing an attachment test with a minimum bending radius, the performance of the hose body inner tube is repeatedly confirmed by pressurization in a state where the minimum bending is applied, and at the same time, the condition of the caulking portion inner tube is checked. As a result, in the ultrahigh-pressure hose of the present invention, there was no abnormality in the inner tube of the hose, the main body, the caulked portion, and the like, and the reinforcing layer was broken by fatigue.

[0012] The impulse test is a test in which the hose is repeatedly pressurized.
Test conditions for a hose of 0 kgf / cm2 (24.5 MPa) are as follows: repetition pressure: 2500 kgf / cm2, repetition cycle: 15 times / min, temperature: 50 ° C., hose installation: bending at the minimum bending radius of the hose.

(Test 2 to Sealing Pressure Test) Specifically, red colored water is sealed in a hose, sealed and pressurized at the maximum operating pressure, and the state of the inner tube after 1000 hours has passed is checked. The occurrence of fatigue cracks in the tube was confirmed. As a result, in the ultrahigh-pressure hose of the present invention, there was no abnormality such as fatigue crack in the inner pipe after 1000 hours. On the other hand, the current ultra high pressure hose using POM resin for the inner tube is 50
At about 0 hours, fatigue cracks occurred.

(Test 3-Deformation due to crimping) After the core metal fitting is inserted into the hose, the outer periphery of the hose is tightened with a fastener to join the hose and the metal fitting. In such a metal core, serrations are formed on the outer peripheral surface in order to maintain the pulling force of the hose and ensure leak resistance, and the inner tube forming the innermost layer of the hose is deformed along the concave and convex shape of the metal core.

As described above, when the crimping is performed by the clamp, the inner tube bites into the unevenness of the surface of the metal core and deforms. However, the current POM resin inner tube having a high hardness and a low elongation at break is used. Cannot withstand this deformation, and cracks may occur during use under pressure. On the other hand, in the case of the inner tube made of the PK resin in the present invention, no crack was generated even in long-term actual use and various tests.

[0016]

According to the present invention, the ultra high pressure hose including the high pressure hose used for transferring fluid water and gas, which employs the structure of the present invention, has a remarkably improved durability compared with the conventional hose. You can see that. That is, by using PK resin instead of the current POM resin as the inner tube material of the ultra-high pressure hose, it was possible to solve the conventional problems and improve the actual service life.

Further, it is excellent in hydrolysis resistance in terms of material properties and can be used not only as an ultra-high pressure hose but also as a tube material in a hose using a fluid. Furthermore, PK resin has excellent gas barrier properties, and thus can be used as a tube material in hoses using gas.

[Brief description of the drawings]

FIG. 1 is a structural view of an ultra-high pressure hose having six reinforcing layers.

[Explanation of symbols]

 10 ‥ (resin) inner tube, 11, 12, 13 ‥ steel wire layer, 14 ‥ (resin) jacket.

Claims (3)

[Claims] An ultra-high pressure hose comprising an inner tube and a plurality of reinforcing layers formed on the outer periphery of the inner tube, and further comprising an outer cover,
An ultra-high pressure hose using a polyketone resin as an inner tube material. 2. The ultra-high pressure hose according to claim 1, wherein the polyketone resin is an aromatic polyketone resin or an aliphatic polyketone resin. 3. The ultra-high pressure hose according to claim 1, wherein four or more steel wire layers are wound as the reinforcing layer.