JPH0435661Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) This invention relates to an improvement of an exposed wire type laminate hose in which metal wires are spirally provided inside and outside the laminate.

(Prior Art) As a hose for transporting fluids such as liquids and gases, open-wire laminate hoses are used, in which metal wires are spirally provided on the inner and outer peripheries of a laminate made of cloth or the like.
That is, as shown in FIG. 3, the laminate hose 1 is made of a laminate 2 made of synthetic resin films such as polypropylene, nylon, and polyester, and cloth such as glass fibers and stainless steel fibers, and metal on the inner and outer peripheries of the laminate 2. It has a structure in which the wires 3 and 3a are exposed and spirally wound. A coupling fitting 4 is attached to the laminate hose 1 having the above structure. The fitting 4 has a nipple 5 having a flange 5a at one end.
and a sleeve 6 that fits over the nipple 5. After removing the metal wires 3, 3a near the ends of the hose 1, the hose is inserted between the nipple 5 and the sleeve 6 and fixed by caulking. , nipple 5
The thick part 5 on the side of the flange 5a provides a sealing property and is held in place.

(Problems to be Solved by the Invention) However, the exposed wire type laminate hose having the above structure has the following problems in practical use.

That is, although the metal wire 3 on the outer periphery is wound so as to press down the laminate 2, a force (repulsion force) is always acting on the metal wire 3 that tends to spread outward. For this reason, the following phenomenon occurs when the laminated hose 1 is bent or twisted, and when the fitting is attached.

First, regarding bending and twisting of the laminated hose 1,
So-called wire collapse occurs. That is, since the outer circumferential metal wire 3 has a repulsive force acting in an outward direction, when the laminated hose 1 is bent, the metal wire 3 loosens on the outside thereof, and when it is twisted, the entire outside metal wire 3 loosens. For this reason, the tightening force of the outer metal wire 3 may be lost, and the pitch may shift, and in extreme cases, the inner metal wire 3a may be climbed over. When the tightening force of the outer metal wire 3 is lost in this way, the inner metal wire 3a may fall down one after another. This kind of wire collapse causes the hose to collapse.

Further, when attaching the joint fitting, there is a problem in that the outer peripheral metal wire meanders at the joint fitting portion or is pushed out from the joint fitting portion.

That is, when the end of the hose 1 is inserted between the nipple 5 and the sleeve 6 and fixed by caulking, the winding diameter of the outer metal wire 3 becomes somewhat smaller. When the winding diameter becomes smaller, the relief portion becomes meandering.
When the outer metal wire 3 meanders, it may bite the laminate 2 between itself and the inner metal wire 3a, causing the laminate 2 to be cut or damaged. Furthermore, if the excess portion created by reducing the winding diameter of the outer metal wire 3 during caulking is successively pushed out to the outside of the fitting, meandering will not occur, but in the portion adjacent to the fitting, the metal The winding diameter of the wire 3 will expand. In this way, the loosening of the outer wire 3 at the most important part adjacent to the metal fittings not only causes the wire to fall, but also greatly affects the durability of the hose itself.

Furthermore, the following problems arose due to the use of metal wire on the outer periphery. The weight of the laminate hose 1 as a whole is heavy, making it difficult to work with, and the exposed metal poses a risk of sparks. Prevention of sparks has been a problem with these types of hoses used to transport hazardous materials such as gas and chemicals. Also, it may cause damage to floors, machinery, etc. There was a problem with durability due to rust.

This invention was made in view of the current situation, and the purpose of this invention is to provide a laminate hose that is free from wire collapse, has excellent durability, and is lightweight and easy to handle.

(Means for Solving the Problems) The structure of this invention is as follows in order to achieve the above object.

That is, in an open-wire laminate hose made of a laminate made of synthetic resin film or the like, with spiral metal wires wound around the inner and outer peripheries with a half pitch shift, the outer periphery metal wire is made of a synthetic material having flexibility and high tensile strength. Abrasion-resistant rubber on the outer periphery of the fibrous core material,
Alternatively, the rope is characterized by being provided with a plastic cover layer. Preferably, the core material of the rope is made of aromatic polyamide fiber or polyester fiber, and the cover layer is made of urethane.

(Example) Hereinafter, this invention will be described in detail based on an illustrative example.

FIG. 1 is a sectional front view of a laminate hose according to this invention, and FIG. 2 is an enlarged sectional view of a rope.

In the drawing, 10 is a laminate hose, 11 is a laminate, 12 is a spiral metal wire provided on the inner periphery of the laminate 11, and 13 is a rope spirally wound around the outer periphery of the laminate 11. It is.

The laminate 11 is formed by laminating synthetic resin films such as polypropylene, nylon, and polyester, and cloth such as glass fiber and stainless steel fiber, as in the prior art.

The rope 13 is formed from a core material 14 and a cover layer 15 provided outside the core material 14.
The core material 14 is a synthetic fiber having flexibility and high tensile strength.
For example, it is preferable to use aromatic polyamide fibers, polyester fibers, etc. In addition, cover layer 1
5 is rubber, synthetic resin, etc. (for example, urethane,
PVC, etc.) is an elastic material with wear resistance.

The rope 13 is wound with a half pitch offset from the metal wire 12, and the tightening force of the rope 13 prevents the metal wire 12 from falling.

In this way, the core material 1 has flexibility and high tensile strength.
4 covered with an elastic cover layer 15
If the structure is such that the laminate is wound with a metal wire, all of the problems associated with the conventional method of winding the outer periphery with a metal wire are solved. That is, there is no outward repulsive force, and since the cover layer 15 is an elastic body, a strong tightening force can be maintained. Furthermore, since the cover layer 15 is an elastic body, it fits well with the laminate and does not loosen even when bent or twisted. Furthermore, the problem of meandering in the joint metal part due to caulking or extrusion from the joint metal part is solved.

Coupling fitting 1 of laminate hose 10 according to the above configuration
To explain the connection structure with 7, joint fitting 1
7 consists of a nipple 18 and a sleeve 19, and the tip of the nipple 18 is provided with a flange 18a. The nipple 18 is formed with a smooth seal part 18b to prevent fluid leakage and a grip part 18d with a spiral groove 18c into which the metal wire 12 is fitted to improve the pulling force. Further, the metal wire 12 and rope 13 are removed from the tip of the laminated hose 10, and an elastic sealing material 20 such as rubber or synthetic resin is fitted therein.

To connect the laminate hose 10 to the coupling fitting 17, the end portion fitted with the elastic sealing material 20 is inserted between the nipple 18 and the sleeve 19, and the mandrel previously inserted into the nipple 18 is inserted. Either the sleeve 19 may be pulled out to expand the inner diameter of the nipple toward the outer circumferential direction and fixed by crimping, or the sleeve 19 may be crimped from the outside.

Next, test results will be shown in which the laminate hose having the above configuration was compared with a conventional product.

First, the exposed wire laminate hose had the following structure.

(Example) Metal wire with a wire diameter of 2.6 m/m and an inner diameter of 76 m/m
wrapped in a spiral, with a synthetic resin film on the outside,
Cloths are layered to form a laminate with a thickness of 3 m/m, and on the outer periphery of this laminate, a core material of Kevlar 49 (registered trademark, manufactured by Dupont) and a urethane cover layer with a wall thickness of 0.7 m/m are placed. A rope provided with the metal wire was wound spirally with a half pitch offset from the metal wire to form an exposed wire laminate hose.

Comparative Example The structure was similar to that of the example, but instead of the rope, a metal wire having the same wire diameter as that used for the inner periphery of the laminate was used.

The test method for these laminate hoses is shown in FIG. That is, metal fittings are attached to both ends of each laminate hose. Apply a pressure of 0 to 20 kg/ ^cm2 inside the hose, and reduce the pressure to 0 kg/cm2 as shown in Figure 4A.
The bending radius at cm ² is approximately 150 m/m, and Fig. 4 B
The bending radius when the pressure is 20Kg/cm ² is approximately
800m/m (almost straight line), pressure 0Kg/
One cycle of raising the weight from cm ² to 20 Kg/cm ² and lowering it again to 0 Kg/cm ² was 30 seconds. We observed the disorder in the wire due to this repetition. As a result, in the case of the comparative example, disturbances occurred in the wire after 10,000 cycles, but in the case of the example, no abnormality was observed even after 20,000 cycles.

(Effects of the invention) As is clear from the above description, according to this invention, metal wires are spirally arranged on the inner and outer peripheries of the laminate in an open-wire laminate hose, and the outer metal wire has flexibility and high tensile strength. Since the rope is made of a synthetic fiber having a core material and covered with an elastic cover layer having abrasion resistance, the following specific effects can be achieved.

(1) Unlike metal wires, there is no outward spreading force (repulsion), so the wires will not fall even if the laminated hose is bent or twisted.

(2) The rope is flexible even when tightening the joint fittings, and the cover layer is an elastic material, so it adapts well even when the diameter is small and does not meander. Therefore, unlike metal wires, the laminate will not be damaged due to engagement with the inner peripheral metal wires.

(3) Since the rope remains flexible when tightening the fittings, it will not be pushed out to the outside of the fittings. Therefore, unlike conventional metal wires, there is no loosening at the part adjacent to the metal fittings, and it is possible to prevent the inner peripheral metal wires from falling down, and it is possible to maintain a strong tightening force.

(4) Since the rope is flexible, it is easy to wind, and a high winding force can be obtained.

(5) Since the core material of the rope is synthetic fiber, the weight of the entire laminate hose can be reduced, making it easy to transport and handle.

(6) Since no metal is exposed on the outside, there is no danger of sparks, and this type of hose can be safely used to transport hazardous materials such as gas and chemicals.

(7) Since the rope has a cover layer made of rubber or synthetic resin, unlike metal wire, it does not damage floors, machinery, etc., and also solves the problem of rust.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional front view of a laminate hose according to this invention, FIG. 2 is an enlarged cross-sectional view of a rope, FIG. 3 is a cross-sectional front view of a conventional product, and FIG. 4 is an explanatory diagram showing a test method. 10 is a laminate hose, 11 is a laminate, 12 is a metal wire, 13 is a rope, 14 is a core material, 15 is a cover layer, 17 is a fitting, 18 is a nipple, 1
8a is a flange, 18b is a seal portion, 18c is a spiral groove, 18d is a grip portion, 19 is a sleeve,
20 is an elastic sealing material.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In an open-wire laminate hose made of a laminate made of synthetic resin film, etc., with spiral metal wires wound around the inner and outer peripheries of the laminate with a half pitch shift, the outer periphery metal wire is 1. A dew-type laminate hose characterized in that the rope is formed by providing a cover layer made of abrasion-resistant rubber or plastic around the outer periphery of a synthetic fiber material core material having flexibility and high tensile strength. (2) The core material of the rope is aromatic polyamide fiber,
Alternatively, the exposed wire type laminate hose according to claim 1, wherein the cover layer is formed of polyester fiber and urethane.