JP5704100B2 - Multi-tank gas supply system - Google Patents

Description

  The present invention relates to a gas supply device, and more particularly to a multi-tank type gas supply device having a plurality of high-pressure tanks for storing gas.

  In fuel cell vehicles and hydrogen gas engine vehicles, a multi-tank type gas supply device is mounted, hydrogen gas as fuel is stored in each high-pressure tank, and hydrogen gas is supplied from a plurality of high-pressure tanks when the vehicle is running. It is supplied to a fuel cell and a hydrogen gas engine through a supply system.

  Each high-pressure tank is connected to a gas filling system and a gas supply system in parallel with each other via valve devices. Each valve device includes a gas filling passage connecting a gas filling system and a corresponding high-pressure tank, a gas supply passage connecting a gas supply system and a corresponding high-pressure tank, and an electromagnetic on-off valve provided in the gas supply passage. Have.

  For filling hydrogen gas, a gas filling system receptacle is connected to a hydrogen gas supply source installed in a gas station or the like, and hydrogen gas is replenished from the gas filling system to each high-pressure tank via a gas filling passage of each valve device. Is done. The hydrogen gas is supplied by opening the electromagnetic on-off valve of each valve device and releasing the hydrogen gas from each high-pressure tank through the gas supply passage to the gas supply system.

  In the multi-tank type gas supply device, when a difference occurs in the internal pressures of the plurality of high-pressure tanks, hydrogen gas flows into a high-pressure tank having a lower internal pressure than a high-pressure tank having a higher internal pressure. Therefore, a reverse differential pressure acts on the open / close valve of the valve device of the low-pressure tank, or hydrogen gas passes through the open / close valve in the reverse direction, which tends to cause a decrease in durability or failure of the open / close valve. .

  In order to solve such a problem, for example, in Patent Document 1, the gas supply system has a pipe part common to each high-pressure tank and a branch pipe part corresponding to each high-pressure tank, and each branch pipe part is more common than the high-pressure tank. A structure is described in which a check valve is provided that allows only the flow of gas toward the tube. According to this structure, even when there is a difference in the internal pressure of multiple high-pressure tanks when supplying gas from the gas supply device, the reverse differential pressure acts on the open / close valve of the high-pressure tank with a low internal pressure, or the hydrogen gas opens and closes It is possible to prevent the valve from passing in the reverse direction.

JP 2002-206696 A

[Problems to be Solved by the Invention]
However, in the structure described in Patent Document 1 above, since hydrogen gas always passes through a check valve provided in the branch pipe portion when hydrogen gas is supplied, pressure loss caused by passing through the check valve Is inevitable. Therefore, the pressure in the high-pressure tank must be higher than the pressure on the downstream side of the check valve. Therefore, it is inevitable that hydrogen gas remains in the high-pressure tank.

The present invention has been made in view of the above-described problems in a multi-tank type gas supply apparatus having a plurality of high-pressure tanks. The main problem of the present invention is that even if a difference occurs in the internal pressures of a plurality of high-pressure tanks, a reverse differential pressure does not act on the on-off valve, and there is no pressure loss when gas is supplied from the gas supply device. Is to provide a multi-tank gas supply device.
[Means for Solving the Problems and Effects of the Invention]

  According to the present invention, the main problem described above has a plurality of high-pressure tanks, and each high-pressure tank is connected to a gas filling system and a gas supply system in parallel to each other via a valve device, and each valve The apparatus includes a gas filling passage connecting the gas filling system and a corresponding high pressure tank, a gas supply passage connecting the gas supply system and a corresponding high pressure tank, an on-off valve provided in the gas supply passage, In the multi-tank type gas supply apparatus, the high-pressure tank that has the lowest internal pressure when the gas supply apparatus supplies gas by discharging gas from the plurality of high-pressure tanks is defined as at least a specific high-pressure tank. The valve device corresponding to the specific high-pressure tank includes a bypass passage that bypasses the on-off valve and connects the gas supply system and the high-pressure tank, and the gas supply provided in the bypass passage. More is accomplished by a plurality tanks Gas supply device for a check valve which allows only the flow of gas toward the high-pressure tank, characterized by having a (the first aspect).

  According to the above configuration, even when there is a difference in the internal pressures of the plurality of high-pressure tanks when the gas supply device supplies gas, the valve device corresponding to the specific high-pressure tank having the lowest internal pressure is opposite to the on-off valve. It is possible to prevent the differential pressure from acting. That is, the check valve is opened by the reverse differential pressure, and the high-pressure gas on the gas supply system side flows into the specific high-pressure tank through the bypass passage. Gas does not pass through the on-off valve in the reverse direction. Therefore, it is possible to effectively prevent the deterioration and failure of the on-off valve due to these.

  Further, according to the above configuration, even in the valve device corresponding to a specific high-pressure tank, the check valve that allows only the gas flow from the high-pressure tank to the gas supply system is not provided in the gas supply passage. Therefore, it can be avoided that the hydrogen gas passes through the check valve when the hydrogen gas is supplied and the pressure loss due to this occurs, as in the case of the structure described in the above-mentioned Patent Document 1, and therefore a specific high pressure is generated. It can be avoided that hydrogen gas remains in the tank.

  Furthermore, according to the above configuration, since the high-pressure gas on the gas supply system side flows into the specific high-pressure tank through the bypass passage, compared to the case where the gas cannot flow into the specific high-pressure tank, The internal pressure of a plurality of high-pressure tanks can be made the same pressure at an early stage. Therefore, when the gas supply is intermittently performed, the possibility that the gas supply is resumed at the same internal pressure of the plurality of high-pressure tanks can be increased.

  Further, according to the present invention, in order to effectively achieve the main problems described above, in the above configuration, the specific high pressure tank is configured to be a high pressure tank having the largest capacity among the plurality of high pressure tanks. (Structure of claim 2).

  According to the above configuration, even if the capacities of the plurality of high pressure tanks are different and the internal pressures of the high pressure tanks are different even if the gas filling to the plurality of high pressure tanks is started at the same time, the durability of the on-off valve is reduced. It is possible to effectively prevent the gas from remaining in the tank.

  According to the present invention, in order to effectively achieve the main problems described above, in the above-described configuration, the specific high-pressure tank has a plurality of high-pressure tanks when the gas supply device supplies gas. It is comprised so that it may be a high pressure tank which starts discharge | release of gas earliest among these (structure of Claim 3).

  According to the above configuration, even when a difference occurs in the internal pressure of the high-pressure tank due to selective gas discharge from a plurality of high-pressure tanks, it effectively prevents a deterioration or failure of the on-off valve. The gas can be prevented from remaining in the tank.

  According to the present invention, in order to effectively achieve the main problems described above, in the above configuration, the valve device corresponding to the high pressure tank other than the specific high pressure tank includes a bypass passage and a check valve. It is comprised so that it may not have (structure of Claim 4).

According to said structure, compared with the case where the valve apparatus corresponding to high pressure tanks other than a specific high pressure tank also has a bypass passage and a non-return valve, the structure of a gas supply apparatus is simplified and cost is reduced. Can do.
[Preferred embodiment of problem solving means]

  According to one preferable aspect of the present invention, the on-off valve is configured to be an electromagnetic on-off valve that is opened and closed by a control device.

  According to another preferred embodiment of the present invention, each valve device is configured to have a check valve that allows only gas flow from the gas filling system to the corresponding high pressure tank.

It is a schematic block diagram which shows 1st embodiment of the multiple tank type gas supply apparatus by this invention comprised as an unequal capacity multiple tank type gas supply apparatus. It is an illustration expansion partial sectional view showing the 1st valve device. It is an illustrative enlarged partial sectional view showing a second valve device. In the first embodiment, when the first and second high pressure tanks are filled with hydrogen gas from the empty state, the pressures P1, P2 in the first and second high pressure tanks and their pressures are filled. It is a graph which shows an example of a change of difference ΔP. It is a schematic block diagram which shows 2nd embodiment of the multiple tank type gas supply apparatus by this invention comprised as an equal capacity multiple tank type gas supply apparatus.

The present invention will now be described in detail with reference to a few preferred embodiments with reference to the accompanying drawings.
[First embodiment]

  FIG. 1 is a schematic configuration diagram showing a first embodiment of a multi-tank gas supply device according to the present invention configured as an unequal capacity multi-tank gas supply device, and FIGS. 2 and 3 are first and second diagrams, respectively. It is an illustration expansion partial sectional view showing a valve device of.

  In FIG. 1, reference numeral 10 generally indicates a multi-tank gas supply apparatus according to the first embodiment. The gas supply apparatus 10 includes a first high-pressure tank 12 for storing hydrogen gas and a second high-pressure tank. And a tank 14. The high-pressure tanks 12 and 14 are connected to the gas filling system 20 and the gas supply system 22 in parallel with each other via a first valve device 16 and a second valve device 18, respectively. In the first embodiment, the first high-pressure tank 12 is a large-capacity tank and has a larger capacity than the second high-pressure tank 14.

  The gas filling system 20 includes a pipe line 24 common to the high-pressure tanks 12 and 14 and branch pipe portions 26A and 26B corresponding to the high-pressure tanks 12 and 14. The common pipe 24 can be connected to a gas supply source installed in a gas station or the like not shown in FIG. 1 by a receptacle 28 provided at one end thereof, and is connected to the other end via a filling manifold 30. Are connected to one ends of the branch pipe portions 26A and 26B. Although not shown in FIG. 1, the receptacle 28 incorporates a check valve that allows only the flow of gas toward the filling manifold 30. When the receptacle 28 is connected to the gas supply source, the check valve is opened by a differential pressure between the pressure of the gas supply source and the pressure in the pipe line 24.

  Similarly, the gas supply system 22 includes a pipe line 34 common to the high-pressure tanks 12 and 14 and branch pipe portions 36A and 36B corresponding to the high-pressure tanks 12 and 14. The common pipe 34 is connected at one end thereof to a hydrogen gas consuming device 38 such as a fuel cell or a hydrogen gas engine not shown in the figure, and at the other end via a supply manifold 40 a branch pipe section. It is connected to one end of 36A and 36B.

  As shown in FIG. 2, the first valve device 16 includes a gas filling passage 42 that connects the gas filling system 20 and the first high-pressure tank 12, a gas supply system 22, and the first high-pressure tank 12. And a gas supply passage 44 for connecting the two. The gas filling passage 42 is provided with a check valve 46 that allows only the gas flow from the gas filling system 20 toward the first high-pressure tank 12, and the gas supply passage 44 is provided with a normally closed electromagnetic on-off valve 48. ing.

  Further, the first valve device 16 is provided with a bypass passage 50 that bypasses the electromagnetic on-off valve 48 and communicates and connects the gas supply passages 44 on both sides of the electromagnetic on-off valve. The bypass passage 50 is provided with a check valve 52 that allows only gas flow from the gas supply system toward the first high-pressure tank 12.

  As shown in FIG. 3, the second valve device 18 includes a gas filling passage 62 that connects the gas filling system 20 and the second high-pressure tank 14, a gas supply system 22, and the second high-pressure tank 14. And a gas supply passage 64 for connecting the two. The gas filling passage 62 is provided with a check valve 66 that allows only the flow of gas from the gas filling system 20 toward the second high-pressure tank 14, and the gas supply passage 64 is provided with a normally closed electromagnetic on-off valve 68. ing. The second valve device 18 is not provided with a bypass passage and a check valve corresponding to the bypass passage 50 and the check valve 52 provided in the first valve device 16.

  The filling manifold 30 and the supply manifold 40 are provided with pressure sensors 70 and 72 for detecting pressures Pin and Pout in the common pipe lines 24 and 34, respectively. The first valve device 16 and the second valve device 18 are provided with pressure sensors 74 and 76 for detecting the pressures P1 and P2 in the first high-pressure tank 12 and the second high-pressure tank 14, respectively. Yes. The outputs of these pressure sensors are input to a vehicle control device not shown in the figure.

  When the gas supply device 10 is filled with hydrogen gas, the receptacle 28 is connected to a hydrogen gas supply source installed in a gas station or the like not shown in FIG. 1, and the supply valve of the gas supply source is opened. The As shown by solid arrows in each drawing, high-pressure hydrogen gas passes through the receptacle 28, the common conduit 24, the filling manifold 30, the branch pipe portions 26A and 26B, and the valve devices 16 and 18, and the high-pressure tank. 12 and 14. When a predetermined amount of hydrogen gas is filled in the high-pressure tanks 12 and 14, the supply valve of the gas supply source is closed, and the connection between the receptacle 28 and the gas supply source is released.

  Further, when hydrogen gas is supplied from the gas supply device 10 to the hydrogen gas consumption device 38, the electromagnetic on-off valves 48 and 68 are opened by the vehicle control device. As indicated by broken arrows in each figure, the high-pressure hydrogen gas in the high-pressure tanks 12 and 14 is supplied from the valve devices 16 and 18, the branch pipe portions 26A and 26B, the supply manifold 40, and the common pipe line. 34 is discharged to the hydrogen gas consuming device 38.

  As shown in FIG. 4, when there is a difference in capacity between the first high-pressure tank 12 and the second high-pressure tank 14, the filling of hydrogen gas into the two empty tanks is started simultaneously. However, there is a difference between the pressures P1 and P2 in the high pressure tanks 12 and 14. That is, the pressure P1 in the high-pressure tank 12 having the larger capacity is lower than the pressure P2 in the high-pressure tank 14 having the smaller capacity (P1 <P2). The difference ΔP (P2−P1) between the pressures P1 and P2 becomes larger when the filling amount of the high-pressure tank is lower than when the filling amount is high.

  When the supply of hydrogen gas is started by opening the solenoid valves 48 and 68 in a situation where the difference ΔP between the pressures P1 and P2 is relatively large, the first valve of the first high-pressure tank 12 is started. A differential pressure ΔP acts on the electromagnetic on-off valve 48 of the device 16 in the opposite direction. That is, the pressure P1e (= P2) on the supply side with respect to the electromagnetic switching valve 48 is higher than the pressure P1t (= P1) on the supply side with respect to the electromagnetic switching valve 48.

  Therefore, in the conventional gas supply device in which the bypass device 50 and the check valve 52 are not provided in the valve device, the reverse pressure difference ΔP acts on the valve device of the tank having the lower internal pressure. As a result, the durability of the electromagnetic on-off valve is likely to deteriorate or break down.

  Further, as in the structure described in Patent Document 1, when the check valves that allow only the flow of hydrogen gas from the high-pressure tanks 12 and 14 to the supply manifold 40 are provided in the branch pipe portions 26A and 26B, respectively, Pressure loss is unavoidable when hydrogen gas passes through the check valve. Therefore, the pressure P1 in the high-pressure tank 12 must be higher than the pressure on the downstream side of the check valve, so that the hydrogen gas in the high-pressure tank 12 cannot be released completely, It is inevitable that the gas remains.

  On the other hand, according to the first embodiment, when the supply of hydrogen gas is started in a situation where the differential pressure ΔP is relatively large, the check valve 52 is opened by the differential pressure. Therefore, the hydrogen gas in the gas supply passage 44 on the downstream side of the electromagnetic opening / closing valve 48 flows to the high pressure tank 12 through the bypass passage 50, and the pressure P1 in the high pressure tank 12 increases. Therefore, it is possible to effectively suppress a large differential pressure ΔP acting on the electromagnetic on-off valve 48 of the first valve device 16 in the reverse direction or hydrogen gas passing through the electromagnetic on-off valve 48 in the reverse direction. As a result, it is possible to effectively reduce the durability of the electromagnetic on-off valve and the possibility of failure.

If the high pressure tanks 12 and 14 are sufficiently filled with hydrogen gas when the gas supply device 10 is filled, the differential pressure ΔP becomes a very small value, so that the check valve 52 is opened by the differential pressure. It will never be done. Therefore, a large differential pressure ΔP acts on the electromagnetic on-off valve 48 of the first valve device 16 in the reverse direction and hydrogen gas does not pass through the electromagnetic on-off valve 48 in the reverse direction. It is discharged to the gas supply system 22 through the electromagnetic on-off valve 48.
[Second Embodiment]

  FIG. 5 is a schematic configuration diagram showing a second embodiment of a multi-tank gas supply device according to the present invention configured as an equal-capacity multi-tank gas supply device. In FIG. 5, the same members as those shown in FIG. 1 are denoted by the same reference numerals as those shown in FIG.

  The gas supply apparatus 10 of the second embodiment is the same as the first embodiment described above except that the first high-pressure tank 12 and the second high-pressure tank 14 have the same capacity. It is configured. Therefore, although not shown in the drawing, the first valve device 16 is provided with the bypass passage 50 and the check valve 52, but the second valve device 18 is not provided with the bypass passage and the check valve. Absent.

  Also in the second embodiment, when the gas supply device 10 is filled with hydrogen gas, the same operation as in the first embodiment is performed. Therefore, the pressure P1 in the first high-pressure tank 12 and the pressure P2 in the second high-pressure tank 14 at the stage where the filling of hydrogen gas is completed are the same.

However, when hydrogen gas is supplied from the gas supply device 10 to the hydrogen gas consuming device 38 immediately after filling with hydrogen gas, only the electromagnetic on-off valve 48 is opened by the control device of the vehicle. Thus as shown In Figure 5 by a broken line arrow, high-pressure hydrogen gas in the high pressure tank 12, the valve device 16, branch pipe portion 3 6A, the supply manifold 40, through a common conduit 34 It is discharged to the hydrogen gas consuming device 38.

  Further, the release of hydrogen gas reduces the pressure P1 in the first high-pressure tank 12, and the difference ΔP between the pressure P1 in the first high-pressure tank 12 and the pressure P2 in the second high-pressure tank 14 is the reference value ΔPc. When the value is equal to or greater than (a positive constant), the electromagnetic on / off valve 68 is also opened by the vehicle control device.

  Therefore, since the electromagnetic on-off valves 48 and 68 are opened in a situation where the difference ΔP between the pressures P1 and P2 is relatively large, the electromagnetic on-off valve 48 of the first valve device 16 of the first high-pressure tank 12 is opened. The differential pressure ΔP acts in the opposite direction. That is, the pressure P1e (= P2) on the supply side with respect to the electromagnetic switching valve 48 is higher than the pressure P1t (= P1) on the supply side with respect to the electromagnetic switching valve 48.

  Therefore, according to the second embodiment, as in the case of the first embodiment, the check valve 52 is opened by the differential pressure ΔP, and the hydrogen gas in the gas supply passage 44 on the downstream side of the electromagnetic opening / closing valve 48. Flows to the high-pressure tank 12 through the bypass passage 50, and the pressure P1 in the high-pressure tank 12 rises. Therefore, it is possible to effectively suppress a large differential pressure ΔP acting on the electromagnetic on-off valve 48 of the first valve device 16 in the reverse direction or hydrogen gas passing through the electromagnetic on-off valve 48 in the reverse direction. As a result, it is possible to effectively reduce the durability of the electromagnetic on-off valve and the possibility of failure.

  In the second embodiment, the pressures P1 and P2 when the gas supply device 10 starts supplying hydrogen gas are substantially the same, and the differential pressure ΔP is substantially zero. Alternatively, the electromagnetic on-off valves 48 and 68 may be opened simultaneously.

  In the first and second embodiments, when the pressure P1 increases and the pressure P2 decreases, the differential pressure ΔP becomes equal to or lower than the pressure required to open the check valve 52. The valve 52 is closed. Accordingly, the hydrogen gas quickly flows into the high-pressure tank 12 through the electromagnetic on-off valve 48 until the pressures P1 and P2 are equal to each other. At this stage, the differential pressure ΔP acting in the opposite direction on the electromagnetic on-off valve 48 is very small, so that the electromagnetic on-off valve 48 is hardly affected by the differential pressure ΔP. When the pressures P1 and P2 are equal to each other, the hydrogen gas in the high-pressure tank 12 is also discharged to the branch pipe portion 36A through the gas supply passage 44 and the electromagnetic on-off valve 48.

  In addition, according to the first and second embodiments, the check valve 52 is provided not in the gas supply passage 44 but in the bypass passage 50. Therefore, no pressure loss is caused by the check valve 52 when the hydrogen gas in the high-pressure tank 12 is supplied through the gas supply passage 44. Therefore, the hydrogen gas in the high-pressure tank 12 can be released until the hydrogen gas in the high-pressure tank 12 is completely exhausted, and remains in the high-pressure tank 12 as compared with the structure described in Patent Document 1. Hydrogen gas can be greatly reduced.

  Further, the high-pressure tank whose internal pressure is lowered when hydrogen gas is supplied is the high-pressure tank 12 having the larger capacity in the first embodiment, and the supply is first performed in the second embodiment. High pressure tank 12 to be started. Therefore, according to the first and second embodiments, the bypass passage 50 and the check valve 52 need only be provided in the first valve device 16. Therefore, the structure of the gas supply device 10 can be simplified and its cost can be reduced as compared with the case where the second valve device 18 is also provided with a bypass passage and a check valve.

  Furthermore, according to the first and second embodiments, when the electromagnetic on-off valve 68 is opened in a situation where the differential pressure ΔP is relatively large, the hydrogen gas in the second high-pressure tank 14 having a high internal pressure is reduced. It flows into the high-pressure tank 12 having a low internal pressure. Therefore, the pressures P1 and P2 can be set to the same pressure at an early stage as compared with the structure described in Patent Document 1 in which hydrogen gas cannot flow into the high-pressure tank 12. Therefore, when the supply of hydrogen gas is intermittently performed, the possibility that the supply of hydrogen gas is resumed at the same pressure P1 and P2 can be increased.

  Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to the above-described embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art.

  For example, in each of the embodiments described above, there are two high-pressure tanks, but the present invention may be applied to a gas supply device having three or more high-pressure tanks. In that case, a bypass passage and a check valve may be provided in a valve device of a high-pressure tank other than the high-pressure tank that has the highest internal pressure when the gas is supplied.

  In the first and second embodiments described above, the bypass device and the check valve are not provided in the valve device of one of the high-pressure tanks. A check valve may be provided. In that case, since the internal pressure of any high-pressure tank may become the lowest at the time of supply of gas, the freedom degree of filling and supply of gas can be made high.

  Further, the specific high-pressure tank is the first tank 12 having a large capacity in the first embodiment, and in the second embodiment, the first tank 12 from which gas discharge is started first. It is. However, the specific high-pressure tank may be a tank that has a large capacity and gas discharge is started first, and may be a tank that has a small capacity as long as the internal pressure is the lowest when the gas is supplied.

  Further, in each of the embodiments described above, the gas supply device 10 is a hydrogen gas supply device mounted on a vehicle, but the gas may be a gas other than hydrogen. The present invention may be applied to a gas supply device mounted on a moving body other than a vehicle, and may be applied to a gas supply device that is fixedly installed.

  DESCRIPTION OF SYMBOLS 10 ... Multiple tank type gas supply apparatus, 12 ... 1st high pressure tank, 14 ... 2nd high pressure tank, 16 ... 1st valve apparatus, 18 ... 2nd valve apparatus, 20 ... Gas filling system, 22 ... Gas Supply system, 24 ... Common pipe, 26A, 26B ... Branch, 28 ... Receptacle, 30 ... Filling manifold, 34 ... Common pipe, 36A, 36B ... Branch, 38 ... Hydrogen gas consuming device, 40 DESCRIPTION OF SYMBOLS ... Supply manifold, 42 ... Gas filling passage, 44 ... Gas supply passage, 46 ... Check valve, 48 ... Electromagnetic switching valve, 50 ... Bypass passage, 52 ... Check valve, 62 ... Gas filling passage, 64 ... Gas supply passage , 66 ... check valve, 68 ... electromagnetic on-off valve, 70 to 76 ... pressure sensor

Claims (4)

  A plurality of high-pressure tanks, and each high-pressure tank is connected to a gas filling system and a gas supply system in parallel with each other via a valve device, and each valve device has a high-pressure tank corresponding to the gas filling system; In a multi-tank type gas supply apparatus, comprising: a gas filling passage to be connected; a gas supply passage for connecting the gas supply system to a corresponding high-pressure tank; and an on-off valve provided in the gas supply passage. A valve device corresponding to at least the specific high-pressure tank is a high-pressure tank having a lowest internal pressure when the gas supply device supplies gas by discharging gas from a plurality of high-pressure tanks. A bypass passage that bypasses the on-off valve and connects the gas supply system and the high-pressure tank; and a gas flow that is provided in the bypass passage and that travels from the gas supply system to the high-pressure tank. Multiple tanks Gas supply apparatus characterized by having a check valve that allows.   The multi-tank gas supply device according to claim 1, wherein the specific high-pressure tank is a high-pressure tank having the largest capacity among the plurality of high-pressure tanks.   2. The multi-tank type according to claim 1, wherein the specific high-pressure tank is a high-pressure tank that starts gas discharge earliest among the plurality of high-pressure tanks when the gas supply device supplies gas. Gas supply device.   The multi-tank gas supply according to any one of claims 1 to 3, wherein a valve device corresponding to a high-pressure tank other than the specific high-pressure tank does not include a bypass passage and a check valve. apparatus.

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