JPS5973684A - Structure of high-pressure hose - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a high-pressure hose, and more specifically, the present invention relates to the structure of a high-pressure hose, and more specifically, a wire braided layer is directly applied to the outer periphery of the inner tube without applying a cloth or yarn braided layer, and a wire spiral layer is applied to the outer periphery. The present invention relates to a structure of a high-pressure hose that is free from peeling of the inner tube due to retention of fluid that has passed through the inner tube and has excellent impulse resistance.

As shown in FIG. 4, a conventional high-pressure hose has an inner tube 1', a cloth or yarn braided layer 2', and a wire spiral reinforcing layer 6'.

4', 5', 6', a cover layer 8', and a "wall insulation layer 9'" were laminated, so there were the following drawbacks.In other words, in the manufacturing process, the first wire spiral layer 3' In order to prevent the wire from digging into the inner tube, a cloth or thread braid 2' is placed around the outer circumference of the inner tube, so when a high water content hydraulic fluid is used, moisture or gas that has passed through the inner tube will The disadvantage is that fluid accumulates in the fabric or yarn braided layer 2', causing separation between the inner tube and the cloth or between the inner tube and the yarn braid, and premature tube cut due to repeated internal pressure fluctuations of the high pressure hose.

The present inventor has conducted repeated studies to eliminate the drawbacks of such conventional high-pressure hoses, and as a result, has arrived at the present invention.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a high-pressure hose structure that is free from peeling of the inner tube due to retention of fluid that has passed through the inner tube and has excellent impulse resistance.

That is, the present invention provides a high-pressure hose comprising a plurality of wire spiral layers on the outer periphery of an inner tube, in which a wire braided layer is provided on the outer periphery of the inner tube, and a wire spiral layer is provided on the outer periphery of the wire braided layer. The gist of this article is the structure of the high-pressure hose.

In the present invention, the inner tube is made of a rubber material that is difficult for fluid to pass through. It is essential to apply a wire braided layer on the outer periphery and further apply a wire spiral layer on the outer periphery, but there is no space between the inner tube and the wire braided layer, and the inner tube is directly coated with the wire braided layer. Coating is preferred. Conventional high-pressure hoses have a cloth or thread grease layer between the inner tube and the wire spiral layer in order to prevent the wires of the wire spiral layer from digging into the inner tube. The permeated fluid remained here, causing inner tube separation. However, in the present invention, since the inner tube is covered with a wire braided layer,
The fluid that has passed through the inner tube passes through the wire braided layer and the wire spiral layer without stagnation, and then reaches the outer layer. Since the wire is braided in the trench, the rubber of the inner tube gets stuck in the intersecting eyes of the pongee braid, creating an anchoring effect and making the inner tube stick tightly together.

In the present invention, it is preferable to provide insulation between the wire braided layer and the wire braided layer. This insulation prevents the wires between each layer from coming into contact and breaking. Moreover, it is preferable to provide a plurality of wire spiral layers, and it is preferable to interpose insulation between each layer.

Braid angle α of the wire braid layer. The relationship between and the spiral angle α1 (see FIGS. 2 and 3) of the first wire spiral layer, which is the next layer, is α. <It is preferable to set it to α1. Also,
When multiple wire spiral layers are provided, the spiral angle should be smaller for the inner layer, and the spiral angle should be smaller than 54.75° for the part near the inner pipe and 54.75° or more for the part near the outer pipe cover. It is preferable to

Furthermore, it is preferable that the cutting elongation of the wires in the wire braided layer is greater than the cutting elongation of the wires in the wire spiral layer. By doing so, the impulse resistance of the hose is significantly improved. Further, it is preferable that the wire used in the wire braided layer has a diameter smaller than that of the wire in the first wire spiral layer. This will improve the arrangement of the wires in the wire spiral layer and increase its strength.

In the present invention, it is preferable to apply a thread resin layer to the outer periphery of the outermost wire spiral layer, and to apply a cover having prickly puffer holes penetrated to the outer periphery.

As a result, fluids such as water and gas that have passed through the inner tube reach the filamentous layer, and from there are released into the atmosphere through the Buritsukifugu hole.

It is generally said that a high pressure hose with a wire braided structure has inferior impulse resistance than a high pressure hose with a wire spiral structure. In other words, in the inner tube 10-wire braid + wire spiral structure, the wires dig into the wire spiral layer and
Even if the adhesion between the inner tube and the wire braid is good, there is a risk that the impulse pressure during use will cause the wires in the wire braid to break earlier than the wires in the wire spiral layer, creating a hole in the tube. structure was not used.

The present invention takes such impulse resistance into consideration, and as mentioned above, the burden of the internal pressure of the high-pressure hose is hardly borne by the wire braided layer on the outer periphery of the inner tube, but is borne by the wires of the wire spiral layer. The wires in the wire braided layer do not break, making this high-pressure hose fully capable of demonstrating the impulse resistance that is a feature of the wire spiral structure.

In addition, the effect of braiding wires with wires that are thinner than the wire diameter of the wire spiral layer is to ensure that the wires of the first wire spiral layer are arranged well in the manufacturing process of forming the wire spiral layer in a spiral shape. This design is designed to prevent holes from forming in the inner tube in the event that the wires in the wire braided layer break.

Hereinafter, the present invention will be specifically described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which 1 is an inner tube, 2 is a wire braided layer, 3 is a first wire spiral layer, 4 is a second wire spiral layer, 5 is a third wire spiral layer, and 6 is a wire braided layer. 4th wire spiral layer, 7 a cotton yarn braided layer, 8 a cover,
Reference numeral 9 indicates an incinerator, 11 a wire with a wire diameter of 0.25, 12 a wire with a wire diameter of 04, and 10 a cover prick hole.

The inner tube 1 is made of a rubber material that can withstand internal fluid. The wire braided layer 2 uses a plus plated wire with a wire diameter φ0.25 and a cutting elongation of 2.7%, which is thinner than the first wire spiral layer wire diameter and has a greater cutting elongation. This is an example in which the spiral angle is smaller than that of the wire spiral layer and smaller than 54.75''.

First wire spiral layer 6, second wire spiral layer 4
, the third wire spiral layer 5, and the fourth wire spiral layer 6 are reinforcing layers to withstand the internal pressure of the high-pressure hose, and have a wire diameter of φ.
0°4 wire was used. Each insulation/9 is
Prevents wire breakage due to contact of each wire spiral layer.

The preassembled resin layer 7 covers the inner tube 1 and each wire spiral layer 3, 4.
．． It functions to collect the gas that has passed through 5.6 and release it into the atmosphere through the Pritski puffer hole 10.

The cover rubber 8 protects each wire spiral layer 3.4, 5.6, etc., which is a reinforcing layer against external conditions.

As explained above, the high-pressure hose of the present invention has a structure in which a wire braided layer is applied to the outer periphery of the inner tube, and a wire spiral layer is further applied to the outer periphery of the wire braided layer, which has the drawbacks of conventional hoses of this type. High water content operation has significantly improved the disadvantages of reduced adhesion between the inner tube and the wire spiral layer, and moisture or gas that has passed through the inner tube and accumulated between the inner tube and the wire spiral layer, causing the inner tube to separate. Suitable for use in piping systems for working fluids mixed with liquids (soluble type, solution type, emulsion type, etc.) or gas.

Hereinafter, the present invention will be explained in detail with reference to Examples.

Example Braiding angle of the wire braided layer: 50°, spiral angle of the first wire spiral layer: 52°, braided wire cutting elongation: 2.7
Regarding this, a high-pressure hose shown in FIG. 1 was prepared with a spiral wire cutting elongation of 2.0%, and the following tests were conducted.

(1) Inner tube peeling test with high water content hydraulic fluid using normal pressure 210Kgf/7 and hose diameter φ19 After filling the hose with 1 K9f/1 N2 gas, fill in 95% soluble oil solution and 7 hours 210 ”V
After applying the loads c and i, the pressure was released for one hour, and the test was continued by changing the load. The temperature was 80°C. As a result, the hose of the present invention showed no abnormality even after 840 hours, but in the conventional high-pressure hose used for comparison, inner tube cut due to inner tube separation occurred after 168 hours.

(2) High temperature impulse test test conditions Pressure Base pressure crab 210 Kgf/d
i, oil temperature 100°C pressure peak pressure crab 315 #
Bend 250mm Pressure Waveform: JIS Waveform Results As mentioned above, the hose of the present invention has impulse resistance equivalent to conventional high-pressure hoses, and is a high-pressure hose that is effective in preventing inner tube cut due to high water content hydraulic fluid. I understand that.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional front view of the hose of the present invention, Fig. 2 is an explanatory view of the wire braiding angle, Fig. 3 is an explanatory view of the first wire spiral angle, and Fig. 4 is a cross-sectional front view of the conventional hose. . DESCRIPTION OF SYMBOLS 1... Inner tube, 2... Wire braided layer, 3-6... Wire spiral layer, 7... Preassembled fat layer, 8... Cover, 9... Insulation, 10. ...Pritski puffer hole. Agent: Patent Attorney Shin Ogawa − Patent Attorney Ken Noguchi Teru Patent Attorney Kazuhiko Saishita

Claims (1)

[Claims] A high-pressure hose comprising a plurality of wire spiral layers on the outer periphery of an inner tube, characterized in that a wire braided layer is provided on the outer periphery of the inner tube, and a wire spiral layer is provided on the outer periphery of the wire braided layer. structure.