JPS5836236B2 - hose - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to suction and discharge hoses used for conveying liquids and slurries such as oil, water, petroleum, sand and gravel slurries, dredging waste and the like.

This type of commonly used hose usually has an inner diameter of 5 to 75 crrL (2 to 30 inches) and consists of a rubber lining or tube, a rubber cover, and a reinforcement or pressure reinforcement inserted between them. and a metal wire spirally wound around the metal wire.

This type of hose must not only withstand pressure work as well as vacuum work, but also be able to resist kinks or kinks that occur when the hose is bent, while also being able to withstand relatively small radii. It must be able to bend sufficiently, and yet be sufficiently flexible that even if the hose is crushed for any reason, it will immediately return to its original circular cross-section when the applied force is removed. It must also have good resilience.

As an example of this type of hose with reinforcing material,
8-8632 discloses a rubber discharge hose.

A woven fabric layer, an intermediate rubber layer, an exterior woven fabric tube, and an external rubber layer are sequentially layered around the outer periphery of the rubber tube inside this discharge rubber hose +-3, and brass plating is applied to the intermediate rubber layer. Two reinforcing stranded iron wires are made by twisting a large number of fine iron wires, one of which is wrapped in a spiral shape on the inside, and the other is wrapped in a spiral shape in the opposite direction so as to intersect on the outside. It is wrapped.

However, in this discharge rubber hose, the outer and inner stranded iron wires are buried throughout the entire thickness of the intermediate rubber layer, and nothing is provided between these two layers of stranded iron wires. Since these stranded iron wires are in direct contact with each other, the amount of rubber material in the intermediate rubber layer is extremely small, and there is a drawback that the recovery property of this intermediate rubber layer is small.

Furthermore, since these two layers of twisted iron wire are in direct contact,
It also has the disadvantage that when the hose expands, contracts, or deforms, these twisted iron wires rub against each other and wear out, causing damage to the hose.

Also, although it is not intended for transporting oil or dredging waste,
A hose-like curved structural member having a reinforcing material inserted therein is disclosed in Japanese Patent Publication No. 42-9071.

This curved structural member is a hose-like body with a hollow part made of a flexible material such as rubber or soft plastic.
A pair of flexible fiber materials that intersect with each other are spirally wound and buried, and a flexible but non-stretchable cord is provided on one side of this hose-like body. When pressurized fluid flows into the hollow part of the body, the non-stretchable cord side cannot stretch, and only the other side stretches, causing this hose-like body to curve, so it cannot be used as a curved structure. be.

In this hose-like body, a pair of intersecting fibers are simply embedded in a flexible material such as soft plastic.

Therefore, this hose-like body shows some resistance to external pressure, but cannot show much resistance to large internal pressure.At the same time, once it is crushed, it returns to its original circular cross-section. It has shortcomings such as low recovery performance.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to obviate the drawbacks of the prior art mentioned above and to obtain a relatively lightweight hose which effectively resists internal and external pressures and which has excellent swell recovery properties. be.

The hose according to the invention has an inner tube of elastic material and at least two radially spaced reinforcing turns of monofilament provided on the outside of said inner tube, these turns forming a part of the hose. 6. spirally wound in opposite directions at an angle of about 5060 degrees with respect to the axis of the hose; a layer of elastic material between said monofilament turns having a thickness not less than 5 mm (3A inches); a cover of elastic material surrounding the outer surface of the hose; and said inner tube and cover. at least one woven layer made of high tensile strength yarn disposed within the wall of the hose adjacent at least one of the monofilament turns; A layer of elastic adhesive is provided between the tensile strength fabric layer and has the effect of adhering therebetween when vulcanized together.

Since the hose of the present invention has such a configuration, it can effectively resist bursting due to an increase in internal pressure, generation of vacuum during suction operation, collapse due to external pressure, etc.

Further, the hose according to the present invention has a characteristic that even if it is crushed for some reason, it quickly returns to its original circular cross section.

Furthermore, the hose according to the invention is lightweight and exhibits very little kinking or kinking.

Although polyester single fibers such as polyethylene terephthalate are preferred as the above-mentioned single fibers, other polymers such as nylon can also be used.

In addition, the high tensile strength yarn mentioned above is made of alumamide. It can also be made with (aramid).

Fabrics made of such aluminous yarns may be either cord or square weave, either of which may be coated with a suitable rubbery material adhesive on one side and the hose vulcanized. The monofilament wrap and the high tensile strength fabric layer are bonded together during the process.

The fabric layer can also be bonded to one of the monofilament layers with a rubber adhesive layer such that the fabric layer is placed between the two monofilament layers.

In such a case, the order of the layers is, for example, monofilament, adhesive material, fabric, rubber, monofilament.

Of course, in each case these multiple layers are contained within the inner lining and outer cover.

Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a hose constructed with an innermost rubber lining or tube 1, a pressure reinforcement 2 and a rubber cover 3. FIG.

The pressure reinforcement 2 consists of a fabric made of natural or synthetic textile material or a layer of steel wire cord.

A heavy metal wire helix 4 is wrapped around the reinforcement 2 and thus contained within the rubber force bar layer 3.

Although such hoses resist pressures that would cause them to collapse, they are relatively dense and require a large amount of associated flotation material in order for them to be able to float on water.

FIG. 2 shows a cross section of a hose wall according to the invention.

This is in order: a innermost lining or tube 5 made of natural or synthetic rubber, b a layer 6 of reinforced fabric made of alumamide spun - this reinforcement has its main axis aligned 5 with the axis of the hose.
Applied at an angle of 5° - C rubber adhesive layer γ, d
A first layer of monofilament 8 - also with its axis aligned with the axis of the hose 5
wrapped at an angle of 5°, e with a layer of body rubber 9, f with a second layer of monofilament 10 applied at 55° to the hose axis (usually opposite to the first layer), and g with a rubber cover. It is composed of one layer 11.

If necessary, a breaker fabric (not shown) can be incorporated inside and/or on the outside.

FIG. 3 shows a hose configuration in which the configuration of the individual layers is similar to that described above with respect to FIG. 2, but the order of the layers is different.

So the layers are applied in the order 5, 8, 7, 6, 9, 10 and 11.

FIG. 4 also shows a cross-section of a hose wall with the same components arranged in a further different order.

In this case, the precepts are arranged in the order of 5, 8, 9, 10, 7, 6, and 11.

Although the alumamide-spun reinforcement fabric layer 6 and the monofilament layers 8 and 10 are shown as one layer for illustrative purposes, in many cases each of these layers will
It is a multi-layer consisting of layers 2, 4, 6 or 8 with the cord applied at a 5° angle, and each layer is applied in the opposite direction to the previous layer in sequence.

Although the fabric is generally applied at a 55° angle,
Angles other than 55° can be used for some or all of the monofilament and/or alumamide layers for specific purposes such as flexibility and kink resistance.

Those skilled in the art will appreciate that the relative thicknesses of the layers and the relative thicknesses of the hose walls to the hose diameter are not necessarily as shown, but these thicknesses and proportions are similar to those common in the art. It should be done.

The rubber layer 9 generally has a thickness of 5 to 10% of the hose diameter and 6
．． It is noted that it is not thinner than 5 mm (% inch).

Although Applicant does not intend to be limited by the theoretical explanation of the invention, the layer of monofilament, which is preferably a polyester monofilament, resists collapsing under vacuum, and It is clear that the layer resists internal pressure.

Additionally, the hose is relatively lightweight since all of its components are organic in nature, unconventional with metal reinforcements.

The hose is also softer than ordinary metal wire reinforced hoses.
It is also more resistant to crushing and has better recovery from any crushing that should occur.

The layer 6 of the aluminous fiber fabric can be composed of, for example, a spun yarn with a tensile strength of 221 per denier and an elongation at break of 2 to 4%.

This yarn can be made as a cord or square weave fabric and has a weight of, for example, 1000 to 2000 denier.

The monofilaments range from 100 to 1500 denier and are preferably based on 1000 to 10,000 denier spun yarns comprised of individual monofilaments having a strength of at least 6 grams per denier.

Table 1 gives the properties of monofilament and alumamide spuns compared to other materials used for hose reinforcement.

This proves the advantageous properties of alumamide fibers in terms of tensile strength and weight.

The advantageous stiffness of monofilaments has not been demonstrated due to the lack of suitable tests.

The preferred construction is that shown in FIG. 2 as this makes best use of the relative strength and stiffness of the components.

Table 2 compares the properties of hoses made with the construction shown in FIG.

These hoses are suitable for oil intake and discharge and are particularly suitable for use as flotation hoses used for this purpose.

(e) By combining the wall thickness and specific gravity as described above, the volume (or weight) of flotation material that must be added to make the hose float with 33% retained buoyancy is the same as for any previous hose. In comparison, it is greatly reduced in the case of monofilament/alamide hose.

The volume of the flotation material is, for the materials listed in the first two columns of Table 2, greater than the volume of the hose body, for example by 100% to 200%, so both the purchase of the flotation material and the application of it to the hose are difficult. The prices involved have been found to be substantial.

In contrast, in the last column of Table 2, since the amount of flotation material is reduced, both the susceptibility of the flotation material to breakage and the significance of its loss are reduced.

As described above, the hose according to the present invention effectively resists internal and external pressures, has good recovery from swells, and is relatively lightweight.

Although some representative examples and details have been shown to illustrate the invention, it will be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a wall section of a hose of a known type, and FIGS. 2, 3 and 4 are corresponding sectional views of a wall section of various embodiments of a hose according to the invention. 1... Lining, 2... Pressure-resistant reinforcing material, 3... Rubber cover, 4... Spiral,
5... Lining, 6... Layer, 7...
...Adhesive layer, 8...First layer, 9...
・Rubber layer, 10... Second layer, 11...
Cover one layer.

Claims (1)

[Claims] 1. A hose of elastic material with reinforcement, comprising an inner tube of elastic material and at least two radially spaced reinforcing turns of monofilament provided on the outside of said inner tube; The windings are about 50-60 in relation to the axis of the hose.
It is spirally wound in opposite directions at a degree angle, and furthermore,
6.571L7rL (y
a layer of elastic material disposed between said monofilament turns having a thickness not less than 4 inches; a cover of elastic material surrounding the outer surface of the hose; and said inner tube and cover. at least one woven layer made of high tensile strength yarn disposed in the wall of the hose adjacent to at least one of said monofilament turns; A hose having an elastic adhesive layer provided between the fabric layer and having the effect of adhering the fabric layer when vulcanized together.