High pressure gas storage device and method of storing high pressure gas

Abstract

To suppress discharge of vaporized gas within a tank into the ambient air and prevent the tank from breaking.SOLUTION: A high pressure gas storage device 10 includes a tank 20 which stores high pressure gas including vaporized gas, an outer shell 30 arranged to make a reservation space S between itself and an outer face of a tank 20 and surrounding the tank 20, and an open / close valve 40 which switches between a valve opening state in which the vaporized gas is allowed to flow from the reservation space S into the tank 20 and a valve closing state in which the vaporized gas is blocked to flow from the reservation space S into the tank 20. When an inner pressure of the reservation space S is larger than an inner pressure of the tank 20, the open / close valve 40 switches from the valve closing state to the valve opening state.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a high-pressure gas storage device and a method for storing high-pressure gas. [Background technology]

[0002] Patent Document 1 discloses a double-shell tank having an inner tank for storing liquefied gas and an outer tank covering the inner tank. The double-shell tank is provided with a discharge line connecting the inter-tank region between the inner tank and the outer tank and a discharge tower. The double-shell tank is provided with a pressure relief device that is provided in the discharge line and opens when the pressure in the inter-tank region exceeds a predetermined inter-tank allowable value. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2021-160619 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the double-shell tank of Patent Document 1, the gas released through the discharge line by the pressure relief device is finally discharged into the atmosphere. If there is a concern that the gas may be discharged into the atmosphere, it is possible to consider not providing a configuration such as the pressure relief device. However, while the strength of a capsule-shaped tank is generally high against internal pressure, it is not high against external pressure. Therefore, if the pressure in the inter-tank region increases due to an increase in the external temperature, etc., there is a risk of damage to the tank constituting the inner tank.

[0005] The present invention was developed in light of the above-mentioned circumstances, and has an object to prevent damage to the tank while suppressing the release of vaporized gas in the tank into the atmosphere. [Means for solving the problem]

[0006] The high pressure gas storage device of the present invention comprises: A tank for storing high-pressure gas including vaporized gas; An outer shell surrounding the tank, the outer shell being disposed to leave a storage space between the outer shell and the outer surface of the tank; an on-off valve that switches between an open state that allows the vaporized gas to flow from the reserve space into the tank and a closed state that blocks the vaporized gas from flowing from the reserve space into the tank; Equipped with The on-off valve switches from the closed state to the open state when the internal pressure of the reserve space becomes greater than the internal pressure of the tank.

[0007] The method for storing high-pressure gas of the present invention comprises the steps of: A method for storing high-pressure gas using a high-pressure gas storage device comprising: a tank for storing high-pressure gas including vaporized gas; and an outer shell surrounding the tank, the outer shell being disposed to leave a storage space between the outer shell and the tank, the method comprising: the high-pressure gas storage device includes an on-off valve that switches between an open state that allows the vaporized gas to flow from the reserve space into the tank and a closed state that blocks the vaporized gas from flowing from the reserve space into the tank; storing an inert gas in the holding space; storing a high-pressure gas including the vaporized gas in the tank; When the internal pressure of the reserve space becomes greater than the internal pressure of the tank, the on-off valve is switched from the closed state to the open state. Effect of the Invention

[0008] With this configuration, it is possible to prevent vaporized gas in the tank from being released into the atmosphere while also preventing damage to the tank. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is an explanatory diagram showing a schematic diagram of a high-pressure gas storage device according to a first embodiment. [Diagram 2] FIG. 1 is an explanatory diagram illustrating a valve support portion and an on-off valve of a tank according to a first embodiment. [Diagram 3] FIG. 10 is an explanatory diagram showing a schematic diagram of a high-pressure gas storage device according to a second embodiment. [Figure 4] FIG. 11 is a block diagram illustrating an example of the electrical configuration of a high-pressure gas storage device according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The tank has a valve port that communicates the inside of the tank with the reserve space, the on-off valve has a valve body that displaces between an open position that opens the valve port and a closed position that closes the valve port, and a biasing member that biases the valve body toward the closed position, and the valve body displaces from the closed position to the open position against the bias of the biasing member when the internal pressure of the reserve space becomes greater than the internal pressure of the tank. With this configuration, a sensor or the like that detects the internal pressure of the tank or the pressure of the reserve space in order to open and close the on-off valve is not required, and the configuration of the device can be simplified.

[0011] The apparatus includes a first pressure sensor that detects the pressure in the tank, a second pressure sensor that detects the pressure in the reserve space, and a control unit that switches the on-off valve between the open state and the closed state based on the detection results of the first pressure sensor and the detection results of the second pressure sensor. With this configuration, the open / closed state of the on-off valve can be accurately controlled based on the pressure value in the tank and the pressure value in the reserve space.

[0012] The holding space is filled with an inert gas. With this configuration, it is possible to prevent air from flowing into the holding space from the outside. Since the gas stored in the holding space is an inert gas, there is no risk of impairing the function of the high-pressure gas stored in the tank or the holding space.

[0013] <Example 1> A first embodiment of the present invention will be described below with reference to Fig. 1 and Fig. 2. In the following description, the F direction in Fig. 1 is defined as the front with respect to the front-rear direction, and the H direction in Fig. 1 is defined as the top with respect to the up-down direction.

[0014] (Configuration of high pressure gas storage device) A high-pressure gas storage device 10 according to the first embodiment is shown in Fig. 1. The high-pressure gas storage device 10 is mounted on, for example, a vehicle. The high-pressure gas storage device 10 supplies high-pressure gas to, for example, an internal combustion engine (engine, etc.).

[0015] The high-pressure gas storage device 10 is configured to include a tank 20 and an outer shell 30 that surrounds the tank 20. The tank 20 and the outer shell 30 are arranged, for example, inside the vehicle (e.g., in the luggage compartment) or outside the vehicle (under the floor of the body). The tank 20 is an airtight storage tank for storing high-pressure gas (high-pressure liquefied gas and vaporized gas). Liquefied gas is a gas that is in the vapor phase at room temperature and atmospheric pressure and is phase-transitioned to the liquid phase by pressurization and cooling. High-pressure vaporized gas is a gas produced by evaporation of the liquefied gas.

[0016] The high-pressure gas stored in the tank 20 is, for example, ammonia. Since ammonia is a harmful substance, an outer shell body 30 is provided as a measure in case the high-pressure gas (ammonia gas) in the tank 20 leaks out of the tank 20. The outer shell body 30 surrounds the tank 20 while leaving a storage space S for temporarily storing the high-pressure gas open.

[0017] 1, the tank 20 has, for example, one tube portion 21 and a pair of dome portions 22, and is capsule-shaped as a whole. The tube portion 21 is a cylindrical portion with its axis oriented horizontally (front-rear direction). The pair of dome portions 22 are approximately hemispherical portions and are arranged so as to close the openings at both ends of the tube portion 21. For example, the tube portion 21 and the pair of dome portions 22 are made of metal members manufactured as separate parts, and are airtightly joined together by welding to form an integrated unit.

[0018] For example, the tank 20 is supported by the outer shell 30 via a plurality of legs (not shown). The plurality of legs (not shown) extend downward from the cylindrical portion 21, for example.

[0019] The outer shell 30 is a capsule-shaped member that airtightly surrounds the entire tank 20 with a gap therebetween. The space between the outer surface of the tank 20 and the inner surface of the outer shell 30 functions as a retention space S for temporarily storing high-pressure gas (vaporized gas) that leaks from the tank 20. The entire outer surface area of ​​the tank 20 and the entire inner surface area of ​​the outer shell 30 face the retention space S.

[0020] The outer shell 30 has, for example, one tubular member 31 and a pair of dome-shaped members 32, and is capsule-shaped as a whole. The tubular member 31 is a cylindrical member with its axis oriented horizontally (front-rear direction), and is disposed coaxially with the tubular portion 21 of the tank 20. The pair of dome-shaped members 32 are portions each having a substantially hemispherical shape, and are disposed so as to close the openings at both ends of the tubular member 31.

[0021] The outer shell 30 (the cylindrical member 31 and the dome-shaped member 32) is configured to include, for example, a metal base member (not shown) and a reinforcing layer attached to the outer surface of the base member. The reinforcing layer is configured by attaching a plurality of elongated reinforcing sheets made of, for example, carbon fiber reinforced plastic (CFRP) in layers to the outer surface of the base member.

[0022] For example, a tube side flange (not shown) provided on the opening edge of the tubular member 31 and a dome side flange (not shown) provided on the opening edge of the dome-shaped member 32 are fastened to each other, thereby integrating the tubular member 31 and the dome-shaped member 32.

[0023] 1, the high-pressure gas storage device 10 further includes a fuel pump 23. The fuel pump 23 is attached to the tank 20. The fuel pump 23, for example, pressure-feeds high-pressure gas (liquefied gas or vaporized gas) in the tank 20 to the internal combustion engine via a fuel path (not shown). The fuel pump 23 is provided, for example, at the upper end (ceiling) of the cylindrical portion 21 of the tank 20. The fuel pump 23 may also be provided at the lower end (bottom) of the cylindrical portion 21 of the tank 20.

[0024] 1, the high-pressure gas storage device 10 further includes a safety valve 24, a safety valve 33, and an introduction portion 34. The safety valve 24 is provided in the tank 20. The safety valve 33 is provided in the outer shell body 30. The introduction portion 34 is provided in the outer shell body 30.

[0025] The safety valve 24 is disposed so as to face the inside of the tank 20 and the retention space S. The primary side opening of the safety valve 24 faces the inside of the tank 20. The secondary side opening of the safety valve 24 faces the retention space S. The safety valve 24 automatically opens when the pressure inside the tank 20 excessively increases (when it reaches or exceeds a certain value), and automatically closes as the pressure inside the tank 20 drops.

[0026] The safety valve 33 is disposed so as to face the retention space S and the outside of the shell body 30. The primary side opening of the safety valve 33 faces the retention space S. The secondary side opening of the safety valve 33 faces the outside of the shell body 30. The safety valve 33 automatically opens when the pressure in the retention space S rises excessively (when it reaches or exceeds a certain value), and automatically closes as the pressure in the retention space S drops.

[0027] The introduction part 34 functions as a part that introduces a gas into the retention space S. The introduction part 34 has, for example, an opening (not shown) provided in the outer shell body 30 and a valve that opens and closes this opening. For example, an inert gas (e.g., nitrogen, etc.) is introduced into the retention space S via the introduction part 34 and stored therein.

[0028] (Configuration of on-off valve) As shown in FIG. 1, the high-pressure gas storage device 10 further includes an on-off valve 40. The on-off valve 40 is provided in the tank 20. The on-off valve 40 switches between an open state that allows the vaporized gas to flow from the holding space S into the tank 20 and a closed state that blocks the vaporized gas from flowing from the holding space S into the tank 20. The on-off valve 40 switches between an open state and a closed state based on the differential pressure between the internal pressure of the tank 20 and the internal pressure of the holding space S. Specifically, the on-off valve 40 is in the open state when the internal pressure of the holding space S becomes higher than the internal pressure of the tank 20. The timing for switching the on-off valve 40 to the open state also includes the time when the internal pressure of the holding space S becomes higher than the internal pressure of the tank 20 to a certain degree. The on-off valve 40 is in a closed state when the internal pressure of the holding space S and the internal pressure of the tank 20 are approximately the same, and when the internal pressure of the holding space S is greater than the internal pressure of the tank 20.

[0029] The on-off valve 40 is attached to the tank 20 as shown in FIG. 2. The tank 20 has a valve support part 50 to which the on-off valve 40 is attached. The valve support part 50 has a tube part 51, a ventilation part 52, and a support part 53. The tube part 51 protrudes from a predetermined position on the upper end part (ceiling part) of the tube part 21 of the tank 20 toward the reserve space S. The tube part 51 surrounds an opening 51A provided in the tube part 21. The tube part 51 has a cylinder part 51B on the tip side (outside). The tube part 51 has an opening 51C on the opposite side to the opening 51B across the support part 53 described later. The opening 51C is connected to the reserve space S.

[0030] Ventilation section 52 is adjacent to opening 51A. Ventilation section 52 is box-shaped and has opening 52A and valve port 52B. Opening 52A is connected to the inside of tank 20. Valve port 52B is connected to retention space S. Valve port 52B connects the inside of tank 20 to retention space S. Support section 53 is a wall connected to cylinder section 51 and ventilation section 52. Support section 53 has hole 53A connecting cylinder section 51B side to ventilation section 52 side.

[0031] The on-off valve 40 has a valve body 60 and an urging member 70. The valve body 60 is displaced between an open position where the valve port 52B is opened and a closed position where the valve port 52B is closed. FIG. 2 shows the valve body 60 in a closed position. The valve body 60 has an axis portion 61, a blocking portion 62, and a pressure receiving portion 63. The axis portion 61 is rod-shaped and passes through the hole 53A. The blocking portion 62 is provided at one end of the axis portion 61. The blocking portion 62 is a lid body having a larger diameter than the hole 53A. The blocking portion 62 moves within the ventilation portion 52. The blocking portion 62 is trapezoidal in a side view. The pressure receiving portion 63 is provided at the other end of the axis portion 61. The pressure receiving portion 63 is, for example, disc-shaped and moves within the cylinder portion 51B while airtightly blocking the cylinder portion 51B.

[0032] The biasing member 70 is an elastic body. The biasing member 70 is, for example, a compression coil spring. The biasing member 70 is housed in the ventilation section 52. One end of the biasing member 70 contacts the wall surface on the opening 52A side of the ventilation section 52. The other end of the biasing member 70 contacts the tip surface of the valve body 60. In a contracted state, the biasing member 70 contacts the valve body 60 in the closed position. The biasing member 70 biases the valve body 60 toward the closed position.

[0033] The internal pressure of the tank 20 is applied to the inner surface (surface exposed to the tank 20) ​​of the pressure receiving portion 63 of the valve body 60. The internal pressure of the retention space S is applied to the outer surface (surface exposed to the retention space S) of the pressure receiving portion 63. When the internal pressure of the retention space S becomes larger than the internal pressure of the tank 20 to a certain extent, the valve body 60 is displaced from the closed position to the open position against the biasing force of the biasing member 70. Then, the valve port 52B is opened, and the vaporized gas in the retention space S flows into the tank 20 via the opening 51C, the valve port 52B, and the opening 52A.

[0034] (Function of high pressure gas storage device) Next, the operation of the high-pressure gas storage device 10 of the present embodiment 1 will be described. The tank 20 that stores high-pressure gas is entirely surrounded by an airtight shell body 30. A retention space S is provided between the tank 20 and the shell body 30 to temporarily store vaporized gas that leaks from the tank 20. As a result, even if the high-pressure gas in the tank 20 leaks outside the tank 20, the leaked vaporized gas remains in the retention space S.

[0035] The on-off valve 40 switches from a closed state to an open state when the internal pressure of the holding space S becomes larger than the internal pressure of the tank 20 due to a relatively high outside air temperature or the like, from a state in which the internal pressure of the holding space S is smaller than or equal to the internal pressure of the tank 20. This allows the gas in the holding space S (nitrogen, vaporized gas leaked from the tank 20, etc.) to flow from the holding space S into the tank 20. Therefore, the internal pressure of the holding space S can be made to be equal to or lower than the internal pressure of the tank 20. This can prevent damage to the tank 20 caused by the internal pressure of the holding space S becoming larger than the internal pressure of the tank 20. Therefore, the high-pressure gas storage device 10 can prevent the vaporized gas in the tank 20 from being released into the atmosphere.

[0036] The on-off valve 40 switches from an open state to a closed state when the internal pressure of the holding space S becomes smaller than or approximately the same as the internal pressure of the tank 20 from a state in which the internal pressure of the holding space S is larger than the internal pressure of the tank 20. This allows the on-off valve 40 to be automatically changed to a closed state when there is no longer any risk of damage to the tank 20.

[0037] The on-off valve 40 has a valve element 60 that is displaceable between an open position where the valve port 52B is opened and a closed position where the valve port 52B is closed, and a biasing member 70 that biases the valve element 60 toward the closed position. When the internal pressure of the retention space S becomes greater than the internal pressure of the tank 20, the valve element 60 is displaced from the closed position to the open position against the bias of the biasing member 70. With this configuration, sensors that detect the internal pressure of the tank 20 or the pressure of the retention space S to open and close the on-off valve are not required, and the configuration of the device can be simplified.

[0038] An inert gas is stored in the holding space S. This makes it possible to prevent air from flowing into the holding space S from the outside. Since the gas stored in the holding space S is an inert gas, there is no risk of impairing the functions of the tank 20 or the high-pressure gas stored in the holding space S.

[0039] (Method of storing high pressure gas) A method for storing high-pressure gas using the high-pressure gas storage device 10 will be described. First, an inert gas (e.g., nitrogen) is stored in the holding space S. Next, a high-pressure gas (e.g., ammonia) including a vaporized gas is stored in the tank 20. Then, when the internal pressure of the holding space S becomes higher than the internal pressure of the tank 20, the on-off valve 40 is switched from a closed state to an open state. Specifically, when the internal pressure of the holding space S becomes higher than the internal pressure of the tank 20, the valve body 60 is displaced from a closed position to an open position against the bias of the biasing member 70. This makes it possible to make the internal pressure of the holding space S equal to or lower than the internal pressure of the tank 20, and thus to suppress damage to the tank 20. Furthermore, since the inert gas is stored in the holding space S, it is possible to suppress the inflow of air from the outside into the holding space S, and there is no risk of impairing the function of the high-pressure gas.

[0040] <Second embodiment> The high-pressure gas storage device 210 of the second embodiment is different from the first embodiment in that the on-off valve 240 is controlled by the control unit 81, but is otherwise common to both embodiments. Note that the same components as those of the first embodiment are given the same reference numerals and detailed description thereof will be omitted.

[0041] (Configuration of high pressure gas storage device) A high-pressure gas storage device 210 of this embodiment 2 is shown in Fig. 3. As shown in Fig. 3, the high-pressure gas storage device 210 includes a first pressure sensor 225, a second pressure sensor 235, and an on-off valve 240.

[0042] The first pressure sensor 225 is provided in the tank 20 (more specifically, the upper end of the cylindrical portion 21). The first pressure sensor 225 detects the pressure inside the tank 20. The detection result of the first pressure sensor 225 (pressure value inside the tank 20) ​​is input to the control unit 281 described later.

[0043] The second pressure sensor 235 is provided in the outer shell 30 (more specifically, the upper end of the cylindrical member 31). The second pressure sensor 235 detects the pressure in the holding space S. The detection result of the second pressure sensor 235 (pressure value of the holding space S) is input to the control unit 281 described later.

[0044] The on-off valve 240 is provided in the tank 20. The on-off valve 240 switches between an open state that allows the vaporized gas to flow from the retention space S into the tank 20 and a closed state that blocks the vaporized gas from flowing from the retention space S into the tank 20. Specifically, the on-off valve 240 is in the open state when the internal pressure of the retention space S is greater than the internal pressure of the tank 20. The on-off valve 240 is in the closed state when the internal pressure of the retention space S and the internal pressure of the tank 20 are approximately the same, and when the internal pressure of the retention space S is greater than the internal pressure of the tank 20.

[0045] The on-off valve 240 is configured as, for example, a solenoid valve. The on-off valve 240 is switched between a closed state and an open state under the control of a control unit 281 described later. The on-off valve 240 is disposed so as to face the inside of the tank 20 and the reserve space S. An opening on the primary side of the on-off valve 240 faces the inside of the tank 20. An opening on the secondary side of the on-off valve 240 faces the reserve space S. The on-off valve 240 sends out the vaporized gas from the tank 20 to the reserve space S under the control of the control unit 281 based on the detection results of the first pressure sensor 225 and the detection results of the second pressure sensor 235. This makes it possible to precisely control the open / close state of the on-off valve 240 based on the pressure value in the tank 20 and the pressure value in the reserve space S.

[0046] (Electrical configuration of high pressure gas storage device) Fig. 4 is a block diagram illustrating a schematic example of the electrical configuration of the high-pressure gas storage device 210. As shown in Fig. 4, the high-pressure gas storage device 210 includes a first pressure sensor 225, a second pressure sensor 235, an on-off valve 240, a control unit 281, and a notification unit 282.

[0047] The control unit 281 is an information processing device having an information processing function and the like. The control unit 281 is mainly configured with, for example, a microcomputer, and has an arithmetic device such as a CPU (Central Processing Unit), and a memory such as a ROM (Read Only Memory) or a RAM (Random Access Memory). The control unit 281 controls the entire high-pressure gas storage device 210. The control unit 281 controls the first pressure sensor 225, the second pressure sensor 235, the on-off valve 240, and the notification unit 282. The detection results of the first pressure sensor 225 and the second pressure sensor 235 are input to the control unit 281.

[0048] The notification unit 282 is, for example, a warning lamp or a speaker that emits an alarm sound. The notification unit 282 may be disposed on the outer surface of the outer shell body 30 or in the vicinity of the outer shell body 30. When the high-pressure gas storage device 210 is mounted on a vehicle, the notification unit 282 is, for example, a warning lamp displayed on the instrument panel of the vehicle or a speaker that emits an alarm sound inside the cabin of the vehicle. The notification unit 282 operates based on a control signal (abnormality detection signal) from the control unit 281. The notification unit 282 performs a notification operation, for example, when the internal pressure of the tank 20 or the internal pressure of the reserve space S becomes equal to or higher than a predetermined value, when the internal pressure of the reserve space S becomes higher than the internal pressure of the tank 20, etc.

[0049] (Function of high pressure gas storage device) When the internal pressure of the reserve space S (detection value of the second pressure sensor 235) becomes higher than the internal pressure of the tank 20 (detection value of the first pressure sensor 225), the control unit 281 switches the on-off valve 240 from a closed state to an open state. This allows the gas in the reserve space S (nitrogen, vaporized gas leaked from the tank 20, etc.) to flow from the reserve space S into the tank 20. Therefore, the internal pressure of the reserve space S can be made equal to or lower than the internal pressure of the tank 20. This can prevent damage to the tank 20 caused by the internal pressure of the reserve space S becoming higher than the internal pressure of the tank 20. Therefore, the high-pressure gas storage device 10 can prevent the vaporized gas in the tank 20 from being released into the atmosphere.

[0050] On the other hand, when the internal pressure of the reserve space S (detection value of the second pressure sensor 235) is greater than the internal pressure of the tank 20 (detection value of the first pressure sensor 225) and becomes smaller than or approximately equal to the internal pressure of the tank 20, the control unit 281 switches the on-off valve 240 from an open state to a closed state. In this way, the high-pressure gas storage device 210 can accurately control the open / close state of the on-off valve 240 based on the pressure value in the tank 20 and the pressure value of the reserve space S.

[0051] <Other Examples> The present invention is not limited to the embodiments described above and illustrated in the drawings, and the following embodiments are also included within the technical scope of the present invention. The present invention can also be applied to cases where the liquefied gas stored in the tank 20 is liquefied petroleum gas (LPG) used as a gas fuel for engines, liquid hydrogen used as a gas fuel for fuel cells, or an energy carrier that is a storage means for a gas (e.g., hydrogen) that serves as a gas fuel. In the first and second embodiments, liquefied gas and vaporized gas are stored in the tank 20, but the tank 20 may store only high-pressure vaporized gas. This high-pressure vaporized gas is not a gas generated by evaporation of the liquefied gas, but a gas that maintains its gas phase in the same manner as under atmospheric pressure during the pressurization process. A specific example of a high-pressure vaporized gas that maintains its gas phase is compressed natural gas (CNG), etc. In the first and second embodiments, the gas stored in the retaining space S may have a smaller specific gravity than the vaporized gas. In the first and second embodiments, the inert gas is stored in the holding space S, but the holding space S may be kept in a vacuum state. This makes it possible to prevent air or the like from flowing into the tank 20 from the holding space S when the on-off valve is in an open state. In the first embodiment, a compression coil spring is exemplified as the biasing member 70 of the on-off valve 40, but other materials such as a rubber material or a foam material may also be used. In the second embodiment, the on-off valve 240 is controlled to open and close based on the detection results of the first pressure sensor 225 and the second pressure sensor 235, but it may be controlled to open and close based on the detection result of either the first pressure sensor 225 or the second pressure sensor 235. For example, the on-off valve 240 may be controlled to an open state by the control unit 281 when the detection value of the second pressure sensor 235 (the internal pressure of the reserve space S) exceeds a threshold value. In this case, the high pressure gas storage device 10 does not need to include the first pressure sensor 225. In the second embodiment, a concentration sensor or a temperature sensor may be used instead of a pressure sensor to control the open / close state of the on-off valve 240. For example, a concentration sensor may be used to detect the concentration of the vaporized gas in the holding space S, and when the concentration exceeds a threshold, the on-off valve 240 may be controlled to an open state. For example, a temperature sensor may be used to detect the temperature of the holding space S, and when the temperature exceeds a threshold, the on-off valve 240 may be controlled to an open state. [Explanation of symbols]

[0052] 10: High pressure gas storage device 20: Tank 21: Cylinder part 22: Dome section 23: Fuel pump 24: Safety valve 30: Exoskeleton 31: Cylindrical member 32: Dome-shaped member 33: Safety valve 34: Introduction 40: On-off valve 50: Valve support 51: Cylinder part 51A: Aperture 51B: Cylinder section 51C: Aperture 52: Ventilation section 52A: Aperture 52B: Valve mouth 53: Support part 53A: Hole 60: Valve body 61: Shaft 62: Occlusion 63: Pressure receiving part 70: Pressurizing member 81: Control section 210: High pressure gas storage device 225: First pressure sensor 235: Second pressure sensor 240: On-off valve 281: Control section 282: Information Department S: Holding space

Claims

1. A tank for storing high-pressure gas including vaporized gas; An outer shell surrounding the tank, the outer shell being disposed to leave a storage space between the outer shell and the outer surface of the tank; an on-off valve that switches between an open state that allows the vaporized gas to flow from the reserve space into the tank and a closed state that blocks the vaporized gas from flowing from the reserve space into the tank; Equipped with A high-pressure gas storage device in which the on-off valve switches from the closed state to the open state when the internal pressure of the storage space becomes greater than the internal pressure of the tank.

2. The tank has a valve port that communicates between the inside of the tank and the retention space, The on-off valve is a valve body that is displaceable between an open position that opens the valve port and a closed position that closes the valve port; a biasing member that biases the valve body toward the closed position; having 2. The high-pressure gas storage device according to claim 1, wherein the valve body is displaced from the closed position to the open position against the bias of the biasing member when the internal pressure of the storage space becomes greater than the internal pressure of the tank.

3. A first pressure sensor for detecting a pressure in the tank; A second pressure sensor for detecting a pressure in the holding space; a control unit that switches the on-off valve between the open state and the closed state based on a detection result by the first pressure sensor and a detection result by the second pressure sensor; The high pressure gas storage device according to claim 1 .

4. The high-pressure gas storage device according to claim 1 , wherein an inert gas is stored in the storage space.

5. A method for storing high-pressure gas using a high-pressure gas storage device comprising: a tank for storing high-pressure gas including vaporized gas; and an outer shell surrounding the tank, the outer shell being disposed to leave a storage space between the outer shell and the tank, the method comprising: the high-pressure gas storage device includes an on-off valve that switches between an open state that allows the vaporized gas to flow from the reserve space into the tank and a closed state that blocks the vaporized gas from flowing from the reserve space into the tank; storing an inert gas in the holding space; storing a high-pressure gas including the vaporized gas in the tank; A method for storing high-pressure gas, which switches the on-off valve from the closed state to the open state when the internal pressure of the storage space becomes greater than the internal pressure of the tank.

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