JPH0658157B2 - Refueling hose for gas stations - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an oil supply hose for gas stations, which comprises a plurality of layers of materials having different liquid permeabilities and has pores for preventing separation between layers.

[Prior Art] Generally, such a hose has an oil-resistant synthetic rubber (NB
R), the outer surface layer is a thermoplastic elastomer (TP) with weather resistance.
E), the intermediate layers of these two layers are made of different materials from the oil-resistant synthetic rubber (NBR) which has affinity for both layers, that is, adhesiveness. Between the inner surface layer and the intermediate layer, a synthetic fiber braid (for example, vinylon filament or the like) is provided as a reinforcing layer, and a metal braid such as stainless steel is provided as a ground wire.

By the way, the transmittance of liquid (including vapor) varies depending on the material, and in the above case, it is as shown in FIG.

Therefore, vapor is accumulated between the inner surface layer and the intermediate layer and between the intermediate layer and the outer surface layer for a long period of time, both layers are separated, and the refueling hose locally bulges.

Various multi-layer hoses are generally known. For example, Japanese Utility Model Laid-Open No. 61-6088 discloses a technique for forming a vent hole in an outer hose layer of a vehicle high-pressure hose including an inner hose layer, a reinforcing layer and an outer hose layer. It is disclosed.

However, in a fueling hose for a gas station, a ground wire is inserted into the fueling hose in order to remove static electricity and ensure safety. If the earth wire is cut, the entire oil supply hose will be replaced. Therefore, the ground wire is buried in a position where it is difficult to cut.

However, when the fine holes are formed, the drilling work is usually performed after the oil supply hose is completed, but the ground wire may be cut during the drilling work. However, it is difficult to prepare a pre-drilled outer layer and coat it.

[Problem to be solved] Therefore, an object of the present invention is to provide an oil supply hose for a gas supply station, which is capable of forming a hole without cutting the ground wire.

[Means for Solving the Problems] According to the present invention, in a refueling hose for a gas station, which is composed of a plurality of layers having different liquid permeabilities and has pores for preventing separation between layers, a layer having a large liquid permeation rate. A metal braided ground wire is provided in a spiral shape on the outer surface of the inner surface of the outer surface of the layer, and pores reach the inside of the layer with low liquid permeability provided outside the layer with high liquid permeability. ing.

[Explanation of Action and Effect] Therefore, a ground wire is embedded in advance in the outer surface of a layer having a high liquid permeability, then a layer having a low liquid permeability is formed thereon, and then pores are formed. However, at that time, the needle for perforating the pores stops between the layers and does not reach the ground wire. Therefore, the ground wire is not cut when the fine holes are formed.

Also, since the ground wire is made of metal braid,
Even if a part of the braid is damaged, the entire conductive state can be maintained.

Therefore, it is possible to prevent vapor from accumulating in the fueling hose as a fueling hose for a gas station, protect the ground wire, and provide a long service life.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

1 and 2, a main body 2 of a refueling hose generally designated by 1 is an inner layer 3 of oil-resistant synthetic rubber (NBR), a reinforcing layer 4 of synthetic fiber braid of vinylon filament, and a weather-resistant synthetic rubber. It is formed of an intermediate layer 5 of (NBR) and an outer surface layer 6 of thermoplastic elastomer (TPE). As shown in the drawing, a ground wire 7 made of, for example, a metal braid of stainless steel is spirally wound on the outer surface of the inner surface layer 3, and is located inside the outer surface of the inner surface layer 3. And the inner layer 3,
The liquid permeability (g / day) of the intermediate layer 5 and the outer surface layer 6 is, for example, 0.3, 0.25 and 0.
It is 1. Therefore, between the inner surface layer 3 and the intermediate layer 5 A
The vapor accumulates in the space B between the intermediate layer 5 and the outer surface layer 6, the layers are separated, and the hose body 2 bulges locally.

On the other hand, in the present invention, the plurality of pores 8 are provided from the outer surface of the inner surface layer 3 to the outer surface of the outer surface layer 6 in the innermost layer whose transmittance is larger than the outer layer. Pore 8
The inner diameter of is, for example, 0.5 mm, and in the illustrated example, the pitch P is arranged at equal intervals of 4 on the circumference of 4 mm. Therefore, layer A
Both the vapor and the vapor between layers B are escaped to the atmosphere through the pores 8. As a result, the vapor is accumulated and the layers A and B are peeled off, and the peeled portion of the hose body 2 is sure to swell. To be prevented.

FIG. 4 shows an embodiment of the present invention in which the outer surface layer 6 has a polygonal shape, in which pores 8 are formed in the thinned portion of the outer surface layer 6, that is, on all sides of the polygon to prevent bulging. is there.

FIG. 5 shows still another embodiment of the present invention. In a hose body 2a having a five-layer structure in which intermediate one, two and three layers 5a, 5b and 5c are provided between an inner surface layer 3 and an outer surface layer 6. In the case where the liquid permeability is highest in the intermediate bilayer 5b, the pores 8a are provided from the outer surface of the outer surface layer 6 to the outer surface of the intermediate bilayer 5b. In this embodiment, the vapor accumulates in the interlayer C, but the vapor is escaped from the pores 8a to the atmosphere, so that the local swelling of the hose body 2a due to the separation of the interlayer C is prevented.

FIG. 6 shows still another embodiment of the present invention. In the hose body 8b having the same five-layer structure as in FIG. 4, when the liquid permeability is large in the intermediate layer 5a and the intermediate three layers 5c, the inner intermediate layer is formed. This is an example in which the pores 8b are provided up to the outer surface of the single layer 5a. In this embodiment, the vapor accumulates in the interlayers D and E, but both the pores 8b
To the atmosphere, so that the local bulging of the hose body 2b due to the peeling of the layers D and E is prevented.

In any of the above embodiments, the ground wire is wound in the same manner as shown in FIGS. 1 and 2.

Therefore, the ground wire 7 is wound around the inner surface layer 3, and the reinforcing layer 4 or the intermediate layer or the like is formed thereon, and finally the outer surface layer is formed thereon, which is completed. Since the ground wire is not damaged when drilling, a refueling hose with a long life can be obtained.

As described above, according to the present invention, it is easy to form pores,
Also, it does not damage the ground wire and prevents bulging due to vapor. Moreover, even if a part of the metal braid is damaged, the overall conductivity is secured. Therefore, it has a long life and high reliability as an oil supply hose for gas stations.

[Brief description of drawings]

FIG. 1 is a side view showing a cross section of one half of an embodiment of the present invention, FIG. 2 is a cross sectional view taken along the line XX of FIG. 1, FIG. FIG. 5 is a sectional view showing another embodiment of the present invention, and FIGS. 5 and 6 are explanatory views combining drawings corresponding to FIGS. 2 and 3 showing different embodiments of the present invention. is there. 1 ... Refueling hose 2, 2a, 2b ... Hose body, 3
...... Inner layer, 5 ... Middle layer, 5a ... Middle layer, 5b ...
… Middle two layers, 5c …… Middle three layers, 6 …… Outer surface layer, 7 ……
Ground wire, 8, 8a, 8b ... Pore

Continuation of the front page (56) References Open 55-147584 (JP, U) Open 55-147583 (JP, U) Open 61-6088 (JP, U) Open 52-103143 (JP) , U) Tokukou Sho 47-11920 (JP, B1) Tokukou Sho 47-25049 (JP, Y1) Tokukou Sho 52-47134 (JP, Y2)

Claims (1)

[Claims] 1. A plurality of layers of materials having different liquid permeability,
In a refueling hose for a gas station, which is provided with pores for preventing separation between layers, a metal braided ground wire is spirally provided at a position within the outer surface of a layer having a large liquid permeability, A refueling hose for a gas station, wherein pores extend to the inside of a layer having a low liquid permeability provided outside a layer having a high permeability.