JP3300506B2 - Hydrogen supply system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydrogen supply system for supplying hydrogen to a vehicle running on hydrogen as a fuel, that is, a vehicle equipped with a hydrogen engine.

[0002]

2. Description of the Related Art In recent automobiles, to prevent environmental pollution by exhaust gas and to diversify fuels,
2. Description of the Related Art There has been proposed an automobile that runs on hydrogen as a fuel, that is, an automobile equipped with a hydrogen engine operated on hydrogen as a fuel (see Japanese Patent Application Laid-Open No. 62-279264).

There are several points to be solved when a hydrogen vehicle is put into practical use. Among them, the most important point in terms of explosion prevention is that the fuel tank is constructed using a hydrogen storage alloy, that is, the engine The problem is solved by storing hydrogen supplied to the hydrogen storage alloy in a form in which it is stored in a hydrogen storage alloy.

[0004]

By the way, in order to spread hydrogen vehicles widely, a hydrogen supply system for supplying, that is, replenishing, hydrogen to the hydrogen vehicles is required. As part of this hydrogen supply system, It is necessary to devise a structure of a hydrogen vehicle suitable for a hydrogen supply station or a hydrogen supply system corresponding to a gas station.

The present invention has been made in view of the above circumstances, and is suitable for replenishing hydrogen to the fuel tank when a fuel tank for a hydrogen vehicle is constructed using a hydrogen storage alloy. It is intended to provide a simple hydrogen supply system.

[0006]

In order to achieve the above object, the hydrogen supply system according to the present invention has the following configuration. That is, a hydrogen vehicle that runs on hydrogen as a fuel includes a fuel tank filled with a hydrogen storage alloy, and a hydrogen supply station for supplying hydrogen to the hydrogen vehicle is connected to the fuel tank. A hydrogen supply system for supplying hydrogen to the hydrogen storage alloy in the tank, a cooling liquid supply system connected to the fuel tank and supplying a cooling liquid for cooling the hydrogen storage alloy in the fuel tank; A hydrogen supply system provided at the hydrogen supply station includes a hose having an inner / outer double structure of an inner hose and an outer hose, and the inner hose is provided with the fuel tank. To supply hydrogen to the fuel tank, and the outer hose is connected to a suction pump to remove air near the connection between the inner hose and the fuel tank. Air suction to suck There is a, some such as configuration.

[0007]

According to the hydrogen supply system of the present invention, hydrogen can be supplied while the fuel tank filled with the hydrogen storage alloy, which is considerably heavy, can be supplied while being mounted on the hydrogen vehicle, so that the operation of supplying hydrogen is easy. In addition, since the hydrogen is supplied while cooling the hydrogen storage alloy, the hydrogen supply time can be shortened while the hydrogen is sufficiently supplied to the fuel tank. In addition to the above, the air suction from the outer hose is preferable from the viewpoint of explosion proof when supplying hydrogen.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, a hydrogen vehicle A has a hydrogen engine 1 mounted on the front of a vehicle body and operated by using hydrogen as a fuel, and a radiator 2 disposed in front of the engine 1. Further, a fuel tank 3 is provided at a lower position in a rear portion of the vehicle body. The fuel tank 3 stores hydrogen using a hydrogen storage alloy filled therein.

FIG. 2 shows a connection system between the engine 1 and the fuel tank 3 and a connection system for supplying hydrogen to the fuel tank 3. In FIG. 2, a portion shown by a dashed line indicates an outer surface of the vehicle body 4 of the hydrogen vehicle, and each device shown outside the vehicle body 4 is mounted on the hydrogen supply station S. Of course, the hydrogen supply station S has a stop space in which the hydrogen vehicle A is stopped for hydrogen supply, as in the conventional gas station. FIG. 2 shows the hydrogen vehicle A as the stop space. Shows a state in which the vehicle is stopped and supplied with hydrogen.

In FIG. 2, a fuel tank 3 filled with a hydrogen storage alloy contains heated engine cooling water (warming liquid).
The cooling water inlet is denoted by reference numeral 3a, the cooling water outlet is denoted by reference numeral 3b, and the hydrogen discharge port is denoted by reference numeral 3c. The inlet 3 and the outlet 3b are connected via a heat transfer tube (not shown) disposed in the fuel tank 3,
The internal heat transfer tube has a long distance so that heat can be efficiently transferred to the hydrogen storage alloy throughout.

A cooling water outlet 1a provided in the engine 1 includes a passage 11, a temperature-sensitive switching valve 12, a passage 13, a pump 14,
The passage 15 is connected to a cooling water inlet 3 a of the fuel tank 3. A cooling water outlet 3b of the fuel tank 3 is connected to a cooling water return port 1b of the engine 1 through a passage 17, and a passage 18 branched from the passage 17 is connected to the switching valve 12
It is connected to the. The switching valve 12 has a passage 17, 18.
When the temperature of the cooling water is equal to or lower than the predetermined temperature, the passage 13 is communicated only with the passage 11 to supply the high-temperature heat medium from the engine 1 to the main fuel tank 3. In addition, passage 17, that is, 1
When the cooling water temperature of 8 is equal to or higher than the predetermined temperature, the passage 13 is communicated only with the passage 18. In this way, the temperature of the cooling water supplied to each fuel tank 3 is controlled so as to be in an optimum temperature range for releasing hydrogen.

The hydrogen discharge port 3c of the fuel tank 3 is connected to the passage 2
1 is connected to a fuel injection valve (not shown) provided in the engine 1. A safety valve 22, which is closed at a predetermined pressure or higher in order from the fuel tank 3 side,
An electromagnetic on-off valve 23, which is closed when the ignition switch is turned off, is connected.

An electromagnetic opening / closing valve 31 and an electromagnetic air release valve 32 (which is always in communication with the atmosphere) are connected to the cooling water supply path 15. Also, the cooling water outlet passage 17
Is connected to an electromagnetic on-off valve 33. The cooling water outlet passage 17 has a bypass passage 34 that bypasses the electromagnetic on-off valve 33, and a suction pump 35 is connected to the bypass passage 34.

Below the engine 1 is disposed a tank 36 for storing water generated by the combustion of hydrogen (liquefied water vapor in the exhaust system), and an outlet of a pipe 37 extending from the tank 36 is provided. The connecting portion 37a is connected to the outside of the vehicle body. A manual switch 38 that is turned on when hydrogen is supplied (supplied) to the fuel tank 3 and a warning lamp 39 that indicates completion of hydrogen supply are provided in the vehicle interior.

The fuel tank 3 has three pipes 41-41.
43 is connected, the pipe 41 is for supplying hydrogen, the pipe 42 is for supplying coolant, and the pipe 43 is for discharging coolant. The outlets of the pipes 41 to 43 are connection portions 41a to 43a to the outside of the vehicle body.
The pipes 42 and 43 for supplying and discharging the coolant are connected to each other by a heat transfer pipe made of a material having excellent heat conductivity. The heat transfer pipe is connected to the hydrogen storage alloy in the fuel tank 3. The fuel tank 3 is disposed throughout the fuel tank 3 so that heat is sufficiently transferred.

The hydrogen vehicle A further includes the connecting portion 4
A ventilation fan 44 for forcibly blowing air toward 1a is provided. As a drive source of the ventilation fan 44, a brushless motor or an air motor is used from the viewpoint of explosion protection. It should be noted that the pumps 14 and 35 and the respective valves 12, 22,
23, 31 to 33 are unitized as shown by reference numeral Y in FIG. 1 and mounted on the vehicle body.

On the other hand, the hydrogen supply station S has a hydrogen supply system K1, a water discharge device K2, and a coolant supply device K3.
And is equipped with. The hydrogen supply system K1 includes a tank 51 for storing hydrogen gas buried underground, and a tank 51 for storing hydrogen gas.
And a hydrogen supply hose 53 is connected to the flow meter 52. The hydrogen supply hose 53 is detachably connected to (the connection part 41a of) the pipe 41.

The water discharger K2 has a tank 55, a pipe 56 extending from the tank 55, and a suction pump 57 connected to the pipe 56. The pipe 56 is attached to and detached from (the connection portion 37a of) the pipe 37. Connected freely.

The coolant supply device K3 uses a stock solution of an engine coolant (coolant) as the coolant. The cooling liquid supply device K3 has a cooling liquid generation device for lowering the cooling liquid to a sufficiently low temperature. In FIG. 2, the cooling liquid generation device includes a tank 61 for storing the generated cooling liquid. Representatively shown. This tank 61
Is connected to a coolant supply pipe 62, and the supply pipe 62 is connected to a supply pump 63 and an electromagnetic air release valve 64. The supply pipe 62 is detachably connected to (the connection part 42a of) the pipe 42.

The cooling liquid supply device K3 has an electromagnetic three-way switching valve 65, and piping 66 to 67 is connected to the switching valve 65. The pipes 66 to 67 constitute a cooling liquid discharge path, and the pipe 66 is detachably connected to (the connection part 43a of) the pipe 43. In addition, piping 6
Reference numerals 7 and 68 serve as branch pipes of the pipe 66, each of which is connected to the tank 61. One of the branch pipes 68 is connected to a suction pump 69.

In the hydrogen supply station S, pipes 41 to
Ventilation fan 7 for forcibly blowing air to connection portions 41a to 43a of 43 (particularly, connection portion 41a for supplying hydrogen).
1 is provided. As a drive source of the ventilation fan 71, a brushless motor or an air motor is used from the viewpoint of explosion protection.

Next, the operation of the above configuration will be described.
That is, a case where hydrogen is supplied to the fuel tank 3 will be described. First, the switch 38 is turned on with the ignition switch turned off and the electromagnetic valve 23 closed. As a result, each of the electromagnetic on-off valves 31 and 33 is closed, and the air release valve 32 makes the passage 15 open to the atmosphere. Thereafter, after a lapse of a predetermined time, that is, a time when each of the valves 31 to 33 is switched to the above state, the pump 35 is operated and the high-temperature warming liquid in the fuel tank 3 is discharged from the engine 1
Discharged to the side. After the pump 35 has been operated for a predetermined time, that is, after the time required for draining all the heating liquid in the fuel tank 3 has elapsed, the operation of the pump 35 is stopped and the lamp 39 is turned on. You.

After confirming the lighting of the lamp 39, the corresponding hoses and pipes 53, 56, 62, 66 are connected to the respective connecting portions 37a, 41a to 43a as shown in FIG. . At this time, the operation of each of the ventilation fans 44 and 71 is started (the operation of the ventilation fans 44 and 71 may be automatically performed by detecting the connection of the hose 53 to the pipe connection portion 41a). it can).

In the above connection state, in the water discharging device K1, the water stored in the tank 36 of the hydrogen vehicle A is discharged to the tank 55 by operating the pump 57. Further, in the hydrogen supply system K1, the pump in the flow meter 52 is operated so that the hose 5 is operated.
3. Hydrogen (hydrogen gas) is supplied into the fuel tank 3 via the pipe 41.

In the cooling liquid supply device K3, the pump 6
By operating the fuel tank 3, the coolant in the tank 61 is supplied to the fuel tank 3 (the hydrogen storage alloy therein) via the pipes 62 and 42, and the coolant after cooling the fuel tank 3 is supplied to the pipe 66. , 67 to the tank 61. To form such a coolant circulation path, the atmosphere release valve 64 is in a state of being cut off from the atmosphere (the tank 61 and the pipe 42 are in communication), and the three-way switching valve 65 is a pipe 66
And 67 are communicated with each other, and the pump 69 is stopped.

After the supply of hydrogen to the fuel tank 3 is completed, the supply of hydrogen from the hydrogen supply system K1 is, of course, stopped. Is discharged. That is, the operation of the supply pump 63 is stopped, the atmosphere release valve 64 is switched to the atmosphere release state, and the three-way switching valve 65 makes the pipes 66 and 68 communicate. In this state, the suction pump 69 is operated, and the coolant in the fuel tank 3 is entirely discharged to the tank 61.

When the above operation is completed, the switch 38
Is turned off, the electromagnetic on-off valves 31 and 33 are opened, and the atmosphere opening valve 32 is switched to a state of not communicating with the atmosphere.

FIG. 3 shows another embodiment of the present invention, in which hydrogen is supplied to the hydrogen vehicle A by replacing the fuel tank 3. That is, the fuel tank 3 mounted on the hydrogen vehicle A is removed, and the fuel tank 3 filled with hydrogen (having sufficient hydrogen stored in the hydrogen storage alloy) is mounted instead. .

For this reason, the hydrogen vehicle A has the fuel tank 3 mounted on the passenger compartment floor 5 in a slidable manner so as to be detachable, and the state shown by the solid line in FIG. The state shown by the dashed line in FIG. 3 is a state where the fuel tank 3 is moved to the replacement position. Floor 5 of the prime car A
Has an opening 6 formed so that the fuel tank 3 can be taken out from below at the replacement position. And, in order to indicate the position of the fuel tank 3 at the regular tower mounting position, the hydrogen vehicle A is provided with an index 8 formed by, for example, combining the N pole and the S pole of a permanent magnet in a predetermined relationship.

The above-described movement of the fuel tank 3 for replacement is performed by a cylinder device 7 mounted on the hydrogen vehicle A. The cylinder device 7 moves the fuel tank 3 to the position of the opening 6 ( For example, an electromagnetic magnet 7a is provided at the tip of the picton rod, and a plate made of a magnetic material is fixed to a surface of the fuel tank 3 facing the magnet 7a. To bring the fuel tank 3 at the replacement position to the regular tower mounting position, the cylinder device 7 presses the fuel tank 3.

On the other hand, the hydrogen supply station S is a hydrogen vehicle A
Has an endless transport conveyor 76 disposed so as to be continuous with the traveling road surface 75. This conveyor 76
Is composed of a left and right pair of a left conveyor on which the left wheel of the hydrogen vehicle A is mounted and a right conveyor on which the right wheel is mounted. In addition, at a predetermined position near the transport conveyor 76,
A position detection sensor 77 for confirming the position of the index 8
Is provided.

A lifter 78 is provided between the pair of right and left conveyors 76 so as to be able to move up and down. The lifter 78 is driven up and down by using a hydraulic cylinder device 79 as a drive source. For the lifter 78 in the lowered position,
The supply conveyor 80 and the discharge conveyor 81 are connected.

In the above configuration, when replacing the fuel tank, the hydrogen-powered vehicle A is mounted on the traveling road surface 7 on the right side of FIG.
5 is moved onto the conveyor 76. Thereafter, the transport conveyor 76 is driven such that the index 8 is at a position detected by the sensor 77. When the index 8 reaches the position detected by the sensor 78, the transport conveyor 76 is stopped. Thereafter, the lifter 78 is raised, and the lifter 78 is positioned at the same height as the floor surface 5 and facing the opening 6.

The fuel tank 3 at the regular column position shown in the solid line in FIG. 3 is drawn out to the position of the opening 6 by the cylinder device 7, and the drawn out fuel tank 3 is transferred onto the lifter 78. . The lifter 78 on which the fuel tank 3 has been transferred is lowered to be connected to the respective conveyors 80 and 81. In this state, the fuel tank 3 transported by the supply conveyor 80 pushes the fuel tank 3 on the lifter 78 and is transferred onto the lifter 78. The fuel tank 3 transported by the supply conveyor 80 is
Fully filled with hydrogen. The lifter 78
The fuel tank 3 which has been pushed away from the hydrogen car A until now is pushed out to the discharge conveyor 81.

The hydrogen-filled fuel tank 3 newly transferred onto the lifter 78 is lifted by the lifter 78 and positioned at the opening 6. In this state, the cylinder device 7 pushes the fuel tank 3 on the lifter 78, and the fuel tank 3 is moved to the proper position on the hydrogen vehicle A.

The fuel tank 3 in which the amount of hydrogen pushed out to the discharge conveyor 81 has been reduced or emptied is supplied with hydrogen at a predetermined place, and then the hydrogen-filled fuel tank is conveyed by the supply conveyor 80. Used as The supply of hydrogen to the fuel tank 3 can be performed at the hydrogen supply station S using the hydrogen supply hose 53 shown in FIG. The hydrogen car A after the replacement of the fuel tank is moved to the traveling road surface 75 on the left side of FIG.

When the fuel tank is replaceable, the fuel tank 3 can be mounted on the trunk room 9 of the hydrogen vehicle A. In this case, the fuel tank 3 is replaced from above with the trunk lid 10 opened. For this purpose, a lifter 82 having a pair of gripping arms 82a that are driven to open and close is provided, and the lifter 82 is suspended via a winding drum 84 from a driving wire 83 extending in the horizontal direction. Has been down. The driving wire 83 is wound around a drum 85, and is reciprocated by a motor (not shown). As in the case where the conveyor 76 is used, the position where the index 8 is detected by the sensor 77 may be set as the exchange position. For example, the index 8 is attached to an appropriate position of the trunk room 9 while the sensor 77 is lifted. 82 so that the sensor 77 detects the index 8
The lifter 82 may be moved (the drive wire 83 is driven and controlled).

When replacing the fuel tank, the fuel tank 3 is first removed (lifted up) from the hydrogen vehicle A by the lifter 82, and the removed fuel tank 3 is transferred to a predetermined collection station. Is done. After this,
The lifter 82 moves to the supply station where the hydrogen-filled fuel tank 3 is integrated, holds the hydrogen-filled fuel tank 3, and transfers it above the trunk room 9. 3 is lowered and transferred to the hydrogen vehicle A.

The hydrogen supply station S has a roof 89 that covers above the fuel tank replacement place. The roof 89 has an air opening 86 that is open to the atmosphere, and the lower surface of the roof 89 is inclined so as to gradually increase toward the air opening 86. An explosion-proof ventilator 87 is provided at the tournament opening 86. Also,
The air opening 86 is prevented from entering rainwater by a cover member 88 set to be gradually higher toward the periphery.
Is fixed to the roof 89 via a stay or the like. As a result, the hydrogen leaked in the event of replacement of the fuel tank is extremely light and immediately reaches the lower surface of the roof 85, and thereafter rises along the lower surface of the roof 89, and finally reaches the atmosphere opening 8
6 to the atmosphere.

FIG. 4 shows a preferred configuration example of the hydrogen supply hose 53 in the example shown in FIG. That is, the hose 53 is formed as an inner / outer double structure of an inner hose 53A and an outer hose 53B, and the inner hose 53A is
To the connecting portion 41a of the pipe 41 extending from the connecting portion 41a. Also, the outer hose 53B (the inner hose 53A)
A suction pump 91 is connected to the passage between the inner hose 53B and the outer hose 53B, and its tip is open to the atmosphere as a trumpet shape surrounding the tip of the inner hose 53A. Thereby, when supplying hydrogen to the fuel tank 3, by operating the pump 91, air near the connecting portion 41a is sucked, and hydrogen (hydrogen gas) leaking from the connecting portion 41a is safely removed. Is released to the atmosphere.

As an explosion-proof measure for the hydrogen vehicle A, as shown in FIG. 1, a ventilation hole 92 is formed in the upper part of the cabin so that hydrogen leaking into the cabin is discharged from the ventilation hole 92 to the atmosphere. You may make it open immediately. This ventilation hole 92
Can be configured to be closed at all times and open only when supplying hydrogen (for example, in conjunction with the switch 38).
In addition, it is preferable to provide an earth line 93 as shown in FIG. 1 in order to release static electricity of the hydrogen vehicle A, especially the fuel tank 3. In this case, as shown in FIG. 2, a connecting portion 93a is formed in the earth line 93 to connect to an earth line 94 having a sufficient earth function provided in the hydrogen supply station S when supplying hydrogen. You can also connect.

Although the embodiment has been described above, for example, the following configuration can be adopted. (1) A fuel tank exchange system as shown in FIG. 3 can be attached to a hydrogen supply station as shown in FIG. In this case, hydrogen can be supplied from the hydrogen supply hose 53 shown in FIG. 2 to the fuel tank 3 removed from the hydrogen vehicle A. (2) Fuel tank 3 filled with hydrogen for next replacement
May be stored while being cooled using a cooling liquid supply device K3 as shown in FIG. That is, a fuel tank storage case 95 is provided at a position where hydrogen can be supplied from the hydrogen supply hose 53, and a coolant circulation path 97 to which a pump 96 is connected is connected to the storage case 95. You may make it. (3) The pump 35 for discharging the heated liquid shown in FIG. 2 may be provided on the hydrogen supply stand S side. In this case, the heating liquid discharged from the fuel tank 3 may be returned from the pump 35 to the engine 1 side. However, the heating liquid is temporarily stored in a tank provided on the hydrogen supply stand S side, After the supply is completed, the heating liquid in the tank may be returned to the hydrogen vehicle A. (4) The storage tank 51 installed in the hydrogen supply station S for storing a large amount of hydrogen may store hydrogen in a system called hydrogen storage using a hydrogen storage alloy. . In this case, a tank for storing a small amount of hydrogen gas is connected to the large tank 51 filled with the hydrogen storage alloy so that hydrogen is supplied to the hydrogen vehicle A from the small tank. Can also. (5) The hydrogen supply system shown in FIG. 2 shows a case where the hydrogen supply system is a so-called ground-mounted system. Good.

[Brief description of the drawings]

FIG. 1 is a simplified partial side view showing an example of a hydrogen vehicle to which the present invention is applied.

FIG. 2 is an overall system diagram showing an embodiment for supplying hydrogen with a fuel tank mounted on a hydrogen vehicle.

FIG. 3 is an overall side view showing an embodiment in which hydrogen is supplied by replacing a fuel tank.

FIG. 4 is a sectional view showing a structure of a hydrogen supply hose suitable for use in the hydrogen supply system shown in FIG. 2;

[Explanation of symbols]

 1: Engine 3 3: Fuel tank 3a: Heating liquid inlet 3b: Heating liquid outlet 5: Floor surface 6: Opening (for fuel tank replacement) 7: Cylinder device (for fuel tank replacement) 8: Index (fuel tank position) 9) Trunk room 10: Trunk lid 15: Heating liquid supply passage 17: Heating liquid discharge passage 31: Solenoid on-off valve (shutoff valve) 34: Bypass passage 35: Pump (for heating liquid discharge) 41: Hydrogen supply pipe 42: Coolant supply pipe 43: Coolant outlet pipe 44: Ventilation fan 51: Hydrogen storage tank 52: Flow meter (built-in hydrogen supply pump) 53: Hydrogen supply hose 53A: Inner hose 53B: Outer hose -S 61: Coolant storage tank (coolant generating device) 63: Pump (for coolant supply) 69: Pump (for coolant discharge) 71: Ventilation fan 76: Transport conveyor 77: Sensor (fuel tank position detection) 78: Lifter 80: Supply conveyor (for transporting filled fuel tanks) 81: Discharge conveyor (for transporting empty fuel tanks) 82: Lifter 83: Drive wire 91: Pump (for air suction) 93: Earth wire 95 : Fuel tank storage case A: Hydrogen vehicle S: Hydrogen supply station K1: Hydrogen supply system K3: Coolant supply device

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshinori Toyohara 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Inside Mazda Co., Ltd. (72) Shigenfumi Hirabayashi 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda (56) References JP-A-58-183853 (JP, A) JP-A-5-254353 (JP, A) JP-A-2-141401 (JP, A) JP-A-63-306367 (JP, A A) JP-A-3-164527 (JP, A) JP-A-62-279264 (JP, A) JP-A-58-144763 (JP, U) JP-A-61-89741 (JP, U) JP-A-59 136 161 (JP, U) Fully open sho 59-92030 (JP, U) Full open hei 2-126930 (JP, U) Full open sho 62-16518 (JP, U) (58) Fields surveyed (Int. Cl) . ^7, DB name) B60S 5/02 B60K 15/00 - 15/10 B67D 5/00 - 5/70

Claims (1)

(57) [Claims] 1. A hydrogen vehicle that runs on hydrogen as a fuel, has a fuel tank filled with a hydrogen storage alloy, and a hydrogen supply station for supplying hydrogen to the hydrogen vehicle is connected to the fuel tank. A hydrogen supply system for supplying hydrogen to the hydrogen storage alloy in the fuel tank, and a coolant connected to the fuel tank and supplying a coolant for cooling the hydrogen storage alloy in the fuel tank comprising a feed system, a hydrogen supply system provided in the supply of hydrogen stand,
A hose having an inner / outer double structure of an inner hose and an outer hose is used.
Wherein the inside host - scan is connected to the fuel tank, the fuel data
The outer hose is connected to a suction pump to supply the inner hose with hydrogen .
Air suction that sucks air near the connection between the
A hydrogen supply system , which is cited .