JP6880591B2 - hose - Google Patents

Description

The present invention relates to a hose, and more particularly to a hose capable of preventing a problem that the gas that has entered between the constituent members of the hose expands and the layers swell when a gas or a liquid containing the gas is flowed. is there.

In rubber hoses and the like, a reinforcing layer is embedded for reinforcement (see, for example, Patent Document 1). When a gas or a liquid containing a gas is passed through such a hose, the gas may permeate the inner layer. The gas that has passed through the inner surface layer enters between the constituent members of the hose (interlayers), and when the internal pressure of the hose decreases, the gas is depressurized and expands between the layers. The expansion of this gas causes a problem that the layers expand. This defect may make the hose unusable.

Japanese Unexamined Patent Publication No. 2001-56073

An object of the present invention is to provide a hose capable of preventing a problem that the gas that has entered between the constituent members of the hose expands and the layers swell when a gas or a liquid containing the gas is flown.

Hose of the present invention for achieving the above object, between the inner surface layer and outer layer laminated coaxially in a hose in which a plurality of reinforcing layers consisting of reinforcing material is laminated coaxially, said inner surface The layer and the outer surface layer are made of resin or vulcanized rubber, and between the layers of the reinforcing layers adjacent to each other in the radial direction, the layers adjacent to each other are joined to each other and serve as a cushioning material for the respective reinforcing layers. The rubber is interposed, and there is a portion where the interlayer rubber is present and a portion where the interlayer rubber is not present between the layers, so that a void path for allowing gas to flow out to the outside of the hose is formed. The interlayer rubber and the reinforcing layer exposed in the portion where the interlayer rubber does not exist between the interlayers form a void road wall that surrounds and partitions the gap path .

According to the present invention, since a gap path for allowing gas to flow out to the outside of the hose is provided between layers of hose components adjacent to each other in the radial direction, the gas that has passed through the inner surface layer is allowed to pass through the gap path to the outside of the hose. Can be leaked to. As a result, it is possible to prevent the problem of swelling between layers due to the expanded gas.

It is a side view which illustrates the embodiment of the hose of this invention by making a part incision. It is a cross-sectional view of the hose of FIG. FIG. 5 is a side view illustrating another embodiment of the hose with a partial incision. It is explanatory drawing which illustrates the deformation example of the winding direction of the void path of FIG. FIG. 5 is a side view illustrating still another embodiment of the hose with a partial incision. It is explanatory drawing which illustrates the deformation example of the winding direction of the void path of FIG.

Hereinafter, the hose of the present invention will be described based on the embodiment shown in the figure.

As illustrated in FIGS. 1 and 2, in the hose 1 of the present invention, the inner surface layer 2 and the reinforcing layer 3 (first layer 3a, second layer 3b, third layer 3c, fourth layer) are arranged in this order from the inner peripheral side. 3d), the outer surface layer 5 has a structure in which the outer surface layers 5 are laminated coaxially. The alternate long and short dash line CL in the drawing indicates the hose axis.

The fluid (gas A or liquid containing gas A) flowing through the hose 1 comes into direct contact with the inner surface layer 2 arranged on the innermost circumference of the hose 1. Therefore, for the inner surface layer 2, an appropriate material is selected according to the flowing fluid, and an appropriate layer thickness is set. For the inner surface layer 2, for example, various vulcanized rubbers and resins can be used, but in order to suppress the permeation of the gas A flowing through the hose 1, it is preferable to use a thermoplastic resin. When the fluid flowing through the hose 1 is hydrogen gas, nylon (nylon 6, nylon 66, nylon 11, etc.), polyacetal, ethylene vinyl alcohol copolymer, or the like is used for the inner surface layer 2.

For the reinforcing layer 3, an appropriate material, structure, or the like is selected based on the pressure resistance performance, bending performance, and the like required for the hose 1. The number of layers of the reinforcing layer 3 is also set to an appropriate number or a plurality of layers based on the performance required for the hose 1.

In this embodiment, four reinforcing layers 3 are provided, and the reinforcing layer 3 has a spiral structure in which a reinforcing material 4 made of a steel wire is spirally wound around a hose axis CL. .. In each reinforcing layer 3, the winding direction of the reinforcing material 4 is alternately different in the stacking order. As the structure of the reinforcing layer 3, in addition to the spiral structure, a blade structure in which the reinforcing member 4 is braided can be used.

As the reinforcing material 4, a metal such as a steel wire can be used. The outer diameter of the reinforcing material 4 is, for example, 0.2 mm or more and 0.8 mm or less.

Interlayer rubbers 6 (6a, 6b, 6c) are interposed between the reinforcing layers 3 which are laminated next to each other. The interlayer rubber 6 joins the reinforcing layers 3 to each other and serves as a cushioning material between the reinforcing materials 4 adjacent to each other. Air gaps 7 (7a, 7b, 7c) are formed in each of the interlayer rubbers 6. That is, the hose 1 has a gap path 7 between layers of reinforcing layers 3 adjacent to each other in the radial direction. As will be described later, the void path 7 has a function of allowing the gas A between the layers to flow out of the hose 1. A gap path 7 may be provided between the inner surface layer 2 and the first layer 3a and between the fourth layer 3d and the outer surface layer 5.

In this embodiment, in each of the interlayer rubbers 6, the gap paths 7 are arranged at three positions at equal intervals in the circumferential direction. Further, the positions in the circumferential direction of the gap paths 7 arranged in the respective interlayer rubbers 6 are the same. When the circumferential positions of the gap paths 7 are the same, the gas A between the layers can easily flow out to the outside of the hose 1.

The circumferential positions of the gap paths 7 arranged in the respective interlayer rubbers 6 can be shifted without matching. If the circumferential positions of the gap paths 7 are the same, the range corresponding to the gap path 7 may be easily deformed locally due to the existence of the gap path 7, but the circumferential direction This problem can be avoided by shifting the position.

The number of the gap paths 7 arranged in one interlayer rubber 6 can be set to a single number or a plurality of arbitrary numbers, but in the case of the gap paths 7 extending linearly in the longitudinal direction of the hose 1, a plurality of gap paths 7 can be set. It is preferable to use, for example, 3 to 8 lines. When a plurality of gap paths 7 are provided in one interlayer rubber 6, it is preferable to arrange them at equal intervals in the circumferential direction.

For the outer surface layer 5 arranged on the outermost circumference of the hose 1, an appropriate material is selected and an appropriate layer thickness is set based on the performance required for the hose 1, the usage environment, and the like. For the outer surface layer 5, for example, various vulcanized rubbers and resins can be used, but it is preferable to use a thermoplastic resin such as polyurethane or polyester in consideration of weather resistance, abrasion resistance, flexibility and the like.

In this embodiment, the outer surface layer 5 is provided with a through hole 5a penetrating in the thickness direction. The diameter of the through hole 5a is, for example, 0.2 mm or more and 1 mm or less. The through holes 5a may be evenly arranged so as to cover the entire range of the outer surface layer 5. If the through hole 5a is provided at a position corresponding to the gap path 7, the gas A between the layers can be easily discharged to the outside of the hose 1.

A major feature of the hose 1 of the present invention is that it has a gap path 7. When gas A or a liquid containing gas A flows inside the inner surface layer 2, if the fluid pressure becomes high, the gas A may permeate the inner surface layer 2 and enter between the constituent members of the hose 1. is there. Therefore, in this hose 1, the gas A between the layers is allowed to flow out of the hose 1 through the gap path 7.

The gap path 7 extends linearly in the longitudinal direction of the hose, for example. In this embodiment, the gap path 7 extends continuously and linearly to one end or both ends in the longitudinal direction of the hose 1. The width of the void 7 is, for example, 1 mm or more and 10 mm or less, and the thickness is, for example, 0.1 mm or more and 1 mm or less.

When a high-pressure gas A or a liquid containing the gas A flows inside the inner surface layer 2 and the gas A permeates the inner surface layer 2 and enters the layers of the constituent members of the hose 1, the gas A passes through the void path 7. It flows. For example, as shown in FIG. 1, the gas A flows in the longitudinal direction of the hose 1 through the gap path 7a and flows out from the hose end to the outside of the hose 1. Alternatively, as shown in FIG. 2, the gas A sequentially passes from the gap 7a through the second layer 3b, the gap 7b, the third layer 3c, the gap 7c, the fourth layer 3d, and the through hole 5a, and the hose 1 It leaks to the outside of. In the process in which the gas A flows from the inner peripheral side to the outer peripheral side of the hose 1 in this way, a small proportion of the gas A flows out from the hose end to the outside of the hose 1 through the respective void paths 7a, 7b, and 7c. There is also.

In the hose 1 of the present invention, the gas A that has passed through the inner surface layer 2 can be discharged to the outside of the hose 1 through the gap path 7, so that the gas A remains between the layers of the constituent members of the hose 1. It becomes difficult. Therefore, even if the internal pressure of the hose 1 is lowered, the gas A does not expand between the layers, or even if it expands, it is sufficient. Therefore, it is possible to prevent the occurrence of a problem that the layers expand due to the gas A that expands between the layers.

Moreover, in the present invention, only the gap path 7 is provided in order to allow the gas A that has passed through the inner surface layer 2 to flow out to the outside of the hose 1, and no special member is added. Since only the void path 7 that becomes a cavity is added, the flexural rigidity of the hose 1 does not increase and the flexibility does not decrease.

In order to allow the gas A between the layers to flow out of the hose 1, the path through which the gas A flows from the inner peripheral side to the outer peripheral side of the hose 1 is shorter than the path through which the gas A flows in the longitudinal direction of the hose 1. Therefore, by providing the through hole 5a in the outer surface layer 5 to form a path through which the gas A flows from the inner peripheral side to the outer peripheral side of the hose 1, the gas A between the layers can easily flow out to the outside of the hose 1. ..

As illustrated in FIG. 3, the gap path 7 can be spirally extended with respect to the hose axis CL. In this embodiment, the spiral winding directions of the void paths 7 (7a, 7b, 7c) are alternately different in the stacking order. The winding direction of each of the void paths 7a, 7b, and 7c is the same as the winding direction of the reinforcing member 4 forming the reinforcing layer 3 (3a, 3b, 3c) adjacent to the inner peripheral side thereof. ing. The spiral winding direction of all the gap paths 7 can be the same. The inclination angle of the gap path 7 with respect to the hose axis CL is, for example, 30 ° or more and 80 ° or less, and is set to an appropriate inclination angle.

As illustrated in FIG. 4, the winding direction of the respective void paths 7a, 7b, 7c is the winding direction of the reinforcing material 4 forming the reinforcing layer 3 (3b, 3c, 3d) adjacent to the outer peripheral side thereof. The specifications can be the same as the direction. The gas A flowing through the void 7 is pushed from the inner peripheral side to the outer peripheral side by the internal pressure acting on the hose 1 and flows. Therefore, by adopting this specification, it becomes easy for the gas A flowing through the gap path 7 to smoothly pass along the reinforcing member 4 existing on the outer peripheral side.

Further, at the time of manufacturing the hose, the unvulcanized rubber forming the respective interlayer rubbers 6 tends to flow to the outer peripheral side, and therefore, along the reinforcing material 4 forming the reinforcing layer 3 adjacent to the outer peripheral side. Flow. Therefore, there is also an advantage that it is easy to form a gap path 7 wound in the same direction as the winding direction of the reinforcing material 4 forming the reinforcing layer 3 adjacent to the outer peripheral side.

In the gap path 7 extending linearly in the longitudinal direction of the hose 1, a plurality of gap paths 7 are required if the gap paths 7 are to be arranged so as to cover the entire range of the respective interlayer rubbers 6. However, when the gap paths 7 are spirally extended in this way, even a single gap path 7 can be arranged so as to substantially cover the entire range of the respective interlayer rubbers 6.

On the other hand, in the gap path 7 extending linearly in the longitudinal direction of the hose 1, the manufacturing operation thereof becomes easy. For example, in the manufacturing process of the hose 1, a band-shaped rubber sheet to be the interlayer rubber 6 is arranged straight in the hose axial direction on the outer peripheral surface of the hose component formed into a cylindrical shape, and each band-shaped rubber sheet is placed in the circumferential direction. It may be arranged at intervals. This interval then becomes the void path 7. In order to manufacture the spiral gap path 7, for example, in the manufacturing process of the hose 1, a band-shaped rubber sheet to be the interlayer rubber 6 is placed on the outer peripheral surface of the hose component formed in a cylindrical shape in the hose axial direction. And spirally wind and arrange.

As illustrated in FIG. 5, both the linearly extending void path 7 and the spirally extending void path 7 can be used in combination. In the embodiment of FIG. 5, the gap paths 7a and 7c extending spirally are arranged on the interlayer rubbers 6a and 6c, and the gap paths 7b extending linearly are arranged on the interlayer rubber 6b. The winding direction of each of the gap paths 7a and 7c is the same as the winding direction of the reinforcing member 4 forming the reinforcing layer 3 adjacent to the inner peripheral side thereof. Which interlayer rubber 6 is arranged on each of the linearly extending void passage 7 and the spirally extending void passage 7 is not limited to the combination shown in this embodiment, and can be appropriately determined.

As illustrated in FIG. 6, the winding direction of each of the gap paths 7a and 7c shall be the same as the winding direction of the reinforcing material 4 forming the reinforcing layer 3 adjacent to the outer peripheral side thereof. You can also. The merits of this specification are as described above.

The gap path 7 does not have to extend to the end of the hose as long as the gas A that has passed through the inner surface layer 2 can flow out to the outside of the hose 1. Further, the gap paths 7 can be arranged not only continuously in the extending direction without division but also intermittently in the extending direction.

When the hose internal pressure (fluid pressure) becomes high, the gas A flowing inside the inner surface layer 2 easily permeates the inner surface layer 2. Therefore, the present invention is effective, for example, when applied to a hose having an internal working pressure of 10 MPa or more, and more effective when applied to a hose having an internal working pressure of 20 MPa or more.

1 Hose 2 Inner surface layer 3 Reinforcing layer 3a First layer 3b Second layer 3c Third layer 3d Fourth layer 4 Reinforcing material 5 Outer surface layer 5a Through hole 6 (6a, 6b, 6c) Interlayer rubber 7 (7a, 7b, 7c) ) Void A gas CL hose axis

Claims (8)

In a hose in which a plurality of reinforcing layers made of reinforcing materials are coaxially laminated between an inner layer and an outer layer which are coaxially laminated.
The inner surface layer and the outer surface layer are made of resin or vulcanized rubber , and the adjacent reinforcing layers are joined to each other between the layers of the reinforcing layers adjacent to each other in the radial direction, and the cushioning material of the respective reinforcing layers is bonded to each other. Interlayer rubber is interposed, and there is a portion where the interlayer rubber is present and a portion where the interlayer rubber is not present between the layers, thereby forming a void path for allowing gas to flow out to the outside of the hose. The hose is characterized in that the interlayer rubber and the reinforcing layer exposed in a portion where the interlayer rubber does not exist between the layers form a void road wall that surrounds and partitions the gap path. The hose according to claim 1, wherein the gap path extends linearly in the longitudinal direction of the hose. The hose according to claim 1 or 2, wherein the gap path extends spirally with respect to the axis of the hose. The hose according to claim 3, wherein the gap paths are provided between the plurality of different layers, and the spiral winding directions of the gap paths are alternately different in the stacking order between the layers. The hose according to claim 4, wherein the winding direction of each of the gap paths is the same as the winding direction of the reinforcing material forming the reinforcing layer adjacent to the outer peripheral side of each of the gap paths. The hose according to any one of claims 2 to 5, wherein the gap paths are continuously arranged in the extending direction without division. The hose according to any one of claims 2 to 5, wherein the gap path is intermittently arranged in the extending direction. The hose according to any one of claims 1 to 7 , wherein the outer surface layer has a through hole penetrating in the thickness direction.

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