JP3086205B2 - Pressure hose - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-resistant hose that is flexible, hard to be crushed, and hard to break.

[0002]

2. Description of the Related Art As a pressure-resistant hose which is flexible and hard to break, there is a hose h as shown in FIG. This hose h is placed outside the inner layer tube 11 made of polyamide resin.
A reinforcing layer 13 is formed by laminating a braid 12 formed by weaving polyester fibers, and an outer layer 14 of soft vinyl chloride is bonded and fixed to the outside of the reinforcing layer. This hose h
The pressure resistance is enhanced by providing the reinforcing layer 13 and the outer layer 14.

[0003]

SUMMARY OF THE INVENTION
Are satisfactory in pressure resistance and resistance to breakage, but are insufficient in flexibility or flexibility. The reason is as follows. In order to obtain the pressure resistance and the difficulty of breaking of the hose h, the blades 12 are double-layered or triple-layered. Therefore, the rigidity of the reinforcing layer 13 is increased, and the hose h is, of course, hardly bent. Even when the outer layer 14 is made of a soft resin, the outer layer 14 is bonded and fixed to the blade 12 which is difficult to extend, and is integrated. Therefore, the rigidity of the entire hose h is increased, and it is difficult to obtain sufficient flexibility or flexibility. In addition, if the thickness of the inner tube 11 and the outer tube 14 is reduced in order to improve flexibility, the inner tube 11 and the outer tube 14 are easily broken. Further, since the outer layer tube 14 of the hose h is made of a soft resin, the friction between the hose and the floor surface is large and the hose is less slippery. For this reason, the workability is poor when working by drawing a long hose or winding on a reel. An object of the present invention is to improve flexibility while maintaining pressure resistance and resistance to breakage of a pressure-resistant hose. Another object is to improve the workability by reducing the friction on the floor and the hose.

[0004]

The present invention provides an inner tube made of a soft synthetic resin, a reinforcing wire made of a hard synthetic resin spirally wound around the outer periphery of the inner tube,
The monofilament coated with a non-adhesive state on the outer circumference of the reinforcing wire member consists of a reinforcing layer braided like a cross, between the helical pitch of the reinforcing wire member, keeping the outer periphery of the inner tube is a state bulging outward, the inner tube Is high inside
When it swells due to pressure, it contacts the reinforcing outer layer and
It is characterized in that it is designed to hold down only. As described above, since the inner tube bulges outward between the pitches of the reinforcing wire and becomes slack, the flexibility is further increased. Also, when the pressure inside the hose becomes high, the inner tube swells further outward between the pitches of the reinforcing wire and comes into contact with the outer reinforcing layer. Therefore, the inner tube is reinforced by the reinforcing outer layer and can withstand high pressure.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pressure-resistant hose H of the embodiment shown in FIGS.
And a reinforcing outer layer 3 is further provided on the outside.
The inner tube 1 is made of a soft resin and has flexibility and elasticity. Then, between the pitches of the reinforcing wires 2, the inner tube 1 has a slack that swells slightly outward. The reinforcing wire 2 is made of a hard resin,
It is fixed to the inner tube. Further, the reinforcing outer layer 3
Is formed by knitting a monofilament 4 in a cross shape, and is in a non-adhered state with the reinforcing wire 2. The monofilament 4 is made of a synthetic resin and has a certain degree of rigidity and tensile strength.

[0006] Since the inner peripheral surface of the reinforcing outer layer 3 is in contact with the reinforcing wire 2 in a non-adhered state, slippage occurs between the inner surface of the reinforcing outer layer 3 and the reinforcing wire 2. Usually, the inner peripheral surface of the reinforcing outer layer 3 is not in contact with the inner tube 1 but is in contact with only the reinforcing wire 2. Therefore, the contact area is small,
The sliding property between the reinforcing outer layer 3 and the reinforcing wire 2 is good. As a result, the flexibility of the pressure-resistant hose H increases. Further, since the monofilaments 4 woven in a cross shape are also easily slipped from each other, when the pressure-resistant hose H bends, the stitches are displaced, so that the reinforcing outer layer 3 may bend along the bend of the pressure-resistant hose H. it can. That is, the reinforcing outer layer 3 does not hinder the flexibility of the pressure-resistant hose H. Furthermore, since the inner tube 1 has a higher flexibility due to the slack between the pitches of the reinforcing wires 2, the pressure-resistant hose H has a higher flexibility than the case without such a slack. Such a pressure-resistant hose H is excellent in that it is not easily broken due to the reinforcing wire 2 and the reinforcing outer layer 3. Furthermore, the provision of the spiral reinforcing wire 2 made it difficult to be crushed.

When the pressure inside the pressure-resistant hose H becomes high, as shown in FIG. 2, the portion 1a of the inner tube corresponding to the pitch of the reinforcing wire 2 extends and expands outward. At this time, since the inner tube 1 is sagged from the beginning between the pitches of the reinforcing wire 2, when the inside becomes high pressure and expands outward, the expanded portion 1 a immediately
Contact The reinforcing outer layer 3 has remarkable rigidity and tensile strength as compared with the inner tube 1. Therefore, high pressure resistance can be obtained by the reinforcing outer layer 3 pressing the inner tube 1 from the outside. The portion 1a between the pitches of the reinforcing wire 2 is easily stretched and, as it is, is a portion having insufficient pressure resistance such as being excessively stretched and bursting, but comes into contact with the reinforcing outer layer 3 before being excessively stretched and is provided with pressure resistance. You. Moreover,
Normally, since there is a hollow portion between the inner tube 1 and the reinforcing outer layer 3, the hose is lighter and more flexible than a hose having the same inner and outer diameters and having no hollow portion.

Further, since this pressure-resistant hose H is provided with the reinforcing outer layer 3 and the reinforcing wire 2 formed by making the monofilaments 4 into a cross shape, the outer cross-section maintains a perfect circle even if there is a hollow portion on the inner surface. become. The section of the pressure-resistant hose H is not deformed, and the contact area between the floor surface and the hoses does not increase. In addition, the reinforcing outer layer 3 is constituted by a monofilament 4 having a cross-sectional diameter of several hundred μm. Since the plurality of monofilaments 4 are formed in a cross shape, the outer peripheral surface of the reinforcing outer layer 3, that is, the outer peripheral surface of the pressure-resistant hose H is uneven as shown in FIG. For this reason, the contact between the floor surface and the hoses becomes a point contact, and a hose having a good sliding property is obtained. As described above, the pressure resistance can be improved by the reinforcing wire 2 and the reinforcing outer layer 3, so that the thickness of the inner layer tube 1 can be made smaller than that of the conventional tube. When the thickness of the inner tube 1 is reduced, the pressure-resistant hose H can be reduced in weight and the flexibility can be improved.

Although the monofilament 4 made of resin is used in this embodiment, the material is not limited to resin, and FRP wire, carbon fiber, or the like can be used. In particular, if a filament having high rigidity and high tensile strength is used, it is difficult to break and a pressure resistance can be obtained. In addition, the outer diameter, cross-sectional shape, cloth weaving method, and the like of the monofilament may be selected according to the working pressure, the inner tube diameter, and the like. That is, an optimum material and shape are selected in consideration of required performance, cost, and the like.

[0010]

The pressure-resistant hose of the present invention has sufficient resistance to breakage and pressure resistance due to the reinforcing wire and the reinforcing outer layer. When the inside of the hose becomes high pressure, the inner tube swells outward between the reinforcement wire pitches,
Because it comes into contact , it is reinforced by the reinforcing outer layer and its bulge
Can be held down and can withstand high pressure. In addition, the provision of the reinforcing wire results in a hose that is not easily crushed. For this reason, the thickness of the inner layer tube can be made thinner than before, and the flexibility and flexibility can be improved and the weight can be reduced while maintaining the resistance to breakage and pressure resistance. In particular, since the reinforcing outer layer is not bonded to the reinforcing wire, when the hose bends, slippage occurs between the reinforcing outer layer and the reinforcing wire. Therefore, flexibility is improved. Furthermore, the inner tube swells outward between the pitches of the reinforcing wire,
It is more flexible because it is sagging. Further, since the reinforcing outer layer is formed of a monofilament knitted in a cross shape, irregularities are formed on the outer peripheral surface, and the slipperiness of the hose is improved. Therefore, workability is good even when the hose is pulled on the floor surface or wound on a reel.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view illustrating a configuration of a pressure-resistant hose of the present embodiment.

FIG. 2 is a cross-sectional view of the present embodiment, showing a state in which the internal pressure is high.

FIG. 3 is a sectional view taken along line III-III of FIG. 1;

FIG. 4 is a sectional view of a conventional example.

[Explanation of symbols]

 H pressure-resistant hose 1 inner tube 2 reinforcing wire 3 reinforcing outer layer 4 monofilament

Claims (1)

(57) [Claims] An inner layer tube made of a soft synthetic resin,
A reinforcing wire made of a hard synthetic resin spirally wound around the outer periphery of the inner tube, and a reinforcing outer layer formed by knitting a monofilament that covers the outer periphery of the reinforcing wire in a non-adhesive state in a cross shape, and the spiral of the reinforcing wire Between pitches, maintain the state where the outer circumference of the inner tube swells outward, and when the inner tube swells due to high internal pressure,
The bulge is suppressed by contacting the reinforcing outer layer.
Pressure hose was.