JP2022184418A - Gas supply device - Google Patents

Abstract

To provide a gas supply device capable of improving accuracy in detecting gas leakage.SOLUTION: A gas supply device 1 includes: a double-structure gas filling hose 10 having an inner hose 101 and an outer hose 102; and a leakage gas flow passage 103 constituted of a clearance between the inner hose 101 and the outer hose 102 so that the gas leaking in the clearance flows to a gas detection sensor 7. The outer hose 102 is composed of a metallic material. The leakage gas flow passage 103 is spirally formed along a longitudinal direction of the gas filling hose 10.SELECTED DRAWING: Figure 2

Description

The present invention relates to a gas supply device.

2. Description of the Related Art As a conventional gas supply device, there is known one having a double structure gas filling hose having an inner hose and an outer hose, as described in Patent Document 1 below. In the gas supply device described in Patent Document 1, the end of the outer hose is communicated with a gas detection sensor, and gas leaked from the inner hose to the gap between the inner hose and the outer hose is detected to detect the gas filling hose. gas leakage can be prevented.

JP-A-9-196295

However, since the above-mentioned gas-filled hose is often made of a resin material, the resin material may swell due to repeated pressurization and depressurization of the gas, deterioration over time, etc. It may adhere to the outer hose. As a result, the gap between the inner hose and the outer hose is reduced, making it difficult for the gas that has leaked into the gap to flow to the gas detection sensor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a gas supply apparatus capable of improving the detection accuracy of gas leakage.

The gas supply device according to the present invention is composed of a double structure gas filling hose having an inner hose and an outer hose, and a gap between the inner hose and the outer hose, and the gas leaking into the gap is discharged. and a leaked gas flow passage for circulating to a gas detection sensor, wherein the outer hose is made of a metal material, and the leaked gas flow passage spirals along the longitudinal direction of the gas filling hose. It is characterized by being formed

In the gas supply device according to the present invention, since the outer hose is made of a metal material, it is possible to suppress the reduction of the gap between the inner hose and the outer hose and secure the leakage gas flow path. In addition, since the leaked gas flow path is spirally formed along the longitudinal direction of the gas filling hose, it is possible to smoothly guide the flow of the leaked gas to the gas detection sensor. As a result, it is possible to improve the detection accuracy of gas leakage.

In the gas supply device according to the present invention, it is preferable that the outer hose has a spiral projection formed by subjecting a metal pipe to spiral drawing. In this way, the spiral leakage gas flow passage can be easily formed.

ADVANTAGE OF THE INVENTION According to this invention, the detection accuracy of gas leakage can be improved.

1 is a schematic configuration diagram showing a gas supply device according to an embodiment; FIG. FIG. 4 is a partial cross-sectional view showing a gas filling hose of the gas supply device; FIG. 3 is a cross-sectional view taken along line AA of FIG. 2; FIG. 11 is a partial cross-sectional view showing a modification of the gas filling hose; FIG. 11 is a partial cross-sectional view showing a modification of the gas filling hose;

An embodiment of a gas supply device according to the present invention will be described below with reference to the drawings. Here, an example in which the gas supply device is applied to a hydrogen station will be described, but the gas supply device of the present invention is not limited to the hydrogen station, and can be used for the transfer of high-pressure hydrogen, compressed natural gas (CNG), and the like. ), natural gas charging, and other manufacturing and energy industries that handle high-pressure hydrogen.

FIG. 1 is a schematic configuration diagram showing a gas supply device according to an embodiment. The gas supply device 1 of the present embodiment is, for example, a hydrogen station employing an on-site system, and fills (in other words, supplies) compressed hydrogen gas to a vehicle M such as a fuel cell vehicle or a fuel cell bus. It is a device for As shown in FIG. 1, a gas supply device 1 is installed between a hydrogen production device 2 for producing hydrogen, a dispenser 6 for filling a vehicle M with hydrogen, and between the hydrogen production device 2 and the dispenser 6. It has a gas supply line 11 , and a compressor 3 , an accumulator 4 and a precooler 5 provided in the gas supply line 11 .

Compressor 3 compresses the hydrogen sent from hydrogen generator 2 . For example, the compressor 3 pressurizes the hydrogen sent from the hydrogen production device 2 to a pressure that can fill the vehicle tank of the vehicle M. The accumulator 4 is a pressure accumulator that stores high-pressure hydrogen. The precooler 5 cools the hydrogen to about -40°C, for example, by circulating the refrigerant.

A gas detection sensor 7 is provided inside the dispenser 6 to detect gas leakage. The gas detection sensor 7 is electrically connected to the control section 12 and transmits detection results to the control section 12 .

The control unit 12 includes, for example, a CPU (Central Processing Unit) that executes calculations, a ROM (Read Only Memory) as a secondary storage device that records programs for calculations, and storage of calculation progress and temporary control variables. It is composed of a microcomputer combined with a RAM (random access memory) as a temporary storage device for storing .

For example, when receiving a signal that the emergency disconnection coupler 8 (described later) is disconnected, the control unit 12 activates the alarm device 13 to inform the surroundings. Further, when receiving the detection result of gas leakage from the gas detection sensor 7, the control unit 12 activates the alarm device 13 and controls to close the gas supply valve 14 attached to the gas supply pipe line 11. do.

As shown in FIG. 1, dispenser 6 is connected to gas filling hose 10 via emergency disconnect coupler 8 . The emergency detachment coupler 8 prevents ejection of high-pressure hydrogen by separating the coupling portion and shutting off the gas supply when a strong tensile force acts on the gas filling hose 10 or the like. Therefore, if the vehicle M starts while the hydrogen gas is being charged, the emergency detachment coupler 8 is disengaged to prevent the hydrogen gas from blowing out and to maintain the safety of the gas supply device 1 .

The gas filling hose 10 is a tube having a double structure, one end of which is connected to the emergency release coupler 8 and the other end of which is connected to the filling nozzle 9 . The filling nozzle 9 is connected to a filling port (not shown) leading to a hydrogen gas tank of the vehicle M when the vehicle M is filled with hydrogen.

Below, the gas filling hose 10 will be described in detail with reference to FIGS. 2 is a partial cross-sectional view showing a gas filling hose of the gas supply device, and FIG. 3 is a cross-sectional view taken along line AA of FIG. The gas filling hose 10 is a double structure tube having an inner hose 101 and an outer hose 102 . The inner hose 101 is a resin hose in which a flow path through which hydrogen flows is formed. The outer hose 102 is made of a metal material and surrounds the inner hose 101 .

The inner hose 101 and the outer hose 102 are arranged with a gap therebetween. A gap between the inner hose 101 and the outer hose 102 constitutes a leaked gas flow passage 103 for circulating the gas leaking in the gap to the gas detection sensor 7 . The end of the leakage gas flow passage 103 on the filling nozzle 9 side is sealed, and the end on the side opposite to the filling nozzle 9 is connected to the gas detection sensor 7 . That is, the gas detection sensor 7 communicates with the gap between the inner hose 101 and the outer hose 102 (in other words, the leaked gas flow passage 103). As a result, even if the hydrogen gas leaks at any part of the inner hose 101, the leaked hydrogen gas flows to the gas detection sensor 7 through the leaked gas flow passage 103, so that the leak can be detected.

As shown in FIG. 2 , the leakage gas flow passage 103 is spirally formed along the longitudinal direction of the gas filling hose 10 .

In this embodiment, the outer hose 102 is a metal flexible pipe formed by spirally drawing a metal pipe. As a result, the outer hose 102 has a spiral protrusion 104 on its outer peripheral surface. The outer hose 102 has substantially the same pipe wall over its entire length.

In the gas supply device 1 of the present embodiment, the outer hose 102 is made of a metal material, so it is possible to suppress a decrease in the gap between the inner hose 101 and the outer hose 102 and secure the leakage gas flow passage 103. can. In addition, since the leaked gas flow passage 103 is spirally formed along the longitudinal direction of the gas filling hose 10 , it is possible to smoothly guide the flow of leaked gas to the gas detection sensor 7 . As a result, it is possible to improve the detection accuracy of gas leakage.

As for the gas filling hose 10, in addition to the contents described above, various modified examples are conceivable.

For example, as shown in FIG. 4, a plurality of struts 105 are provided between the inner hose 101 and the outer hose 102 to maintain the space of the leaked gas flow passage 103 . The strut 105 is formed integrally with the inner hose 101, for example. Further, the struts 105 are not provided over the entire length or the entire circumference of the inner hose 101, but are arranged, for example, at predetermined length intervals so as not to block the flow of the leaked gas in the leaked gas flow passage 103. By providing the struts 105 in this manner, the leakage gas flow passage 103 can be secured more reliably.

Also, as shown in FIG. 5, the outer hose 102 has a smooth outer wall and a spiral groove 106 is formed in the inner wall. In this way, the spiral leakage gas flow passage 103 can be easily formed.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the invention described in the claims. Changes can be made.

1 Gas supply device 2 Hydrogen production device 3 Compressor 4 Accumulator 5 Precooler 6 Dispenser 7 Gas detection sensor 8 Emergency release coupler 9 Filling nozzle 10 Gas filling hose 11 Gas supply line 12 Control unit 13 Alarm device 14 Gas supply valve 101 Inner hose 102 Outer hose 103 Leakage gas flow passage 104 Convex portion 105 Strut 106 Groove

Claims (2)

Leakage gas circulation is composed of a double structure gas filling hose having an inner hose and an outer hose, and a gap between the inner hose and the outer hose, and circulates the gas leaking in the gap to the gas detection sensor. and a gas supply device comprising:
The outer hose is made of a metal material,
The gas supply device, wherein the leaked gas flow passage is spirally formed along the longitudinal direction of the gas filling hose. 2. The gas supply device according to claim 1, wherein said outer hose has a spiral projection formed by subjecting a metal pipe to spiral drawing.

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