JPS5828098A - Cryogenic fuel tank used together with engine, etc. - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION In the past, various types of cryogenic fuel tanks have been developed with the intention of containing highly volatile fuels such as liquid natural gas using acceptable pressures and limited emissions. has been used. In all cases 2, design emphasis has been placed on reducing the flow of heat from the environment to the tank through artistic thermal insulation.

In the tank 2 disclosed in U.S. Pat. No. 2,795,937, when the engine is using fuel, a second fluid is cooled by the evaporating fuel. The behavior of the US patent tank during storage is the same as that of an ordinary thermally insulated tank.

No matter how good the insulation, it is impossible to completely eliminate the heat flux from the environment to the reserve fuel, so all current designs of cryogenic fuel tanks require either partial or total evacuation of the fuel. the undesirable characteristics of leakage and uncontrollable fluctuations in the fuel pressure inside the tank, said undesirable characteristics having the potential to pose a hazard or reduce the proper performance of the engine. There is. A secondary cryogenic liquid is used to absorb heat flow from the surrounding environment, and the secondary fluid is cooled below the temperature of the secondary fuel with the aid of a cooling device operating between the secondary liquid and the reserve fuel. By virtue of the present invention, which is maintained at a low temperature, the above-mentioned drawbacks have been eliminated.

It is an object of the present invention to provide an efficient and safe to operate cryogenic fuel tank for motor vehicle transportation and the use of very low boiling point fuels such as liquid natural gas.

The cryogenic fuel tank of the present invention consists of two containers, one for the cryogenic fuel reservoir and the other for the secondary cryogenic liquid, between which a cooling cycle operates; and is isolated from the surrounding environment to prevent heat leakage to the secondary fluid.

Since it is not possible to completely eliminate heat leakage, during long storage periods the pressure inside the container may tend to increase. In order to maintain the pressure inside the fuel container at a suitably constant level, the invention uses a cooling device and a heat transfer bridge between the two containers. During engine operation, when fuel is being extracted from the tank, the cooling system operates between the fuel as its heat sink and the secondary fluid as its cooled medium. In this way, the temperature of the secondary fluid is reduced. The heat rejected into the fuel causes some of the fuel to evaporate. However, because fuel is being continuously extracted from the tank for use inside the engine, the pressure inside the fuel container does not increase. Then, during the storage period, a heat transfer bridge between the two containers transfers heat from the fuel to the cold two under controlled conditions so that the pressure inside the fuel container is maintained at a constant level. Can flow to the next fluid.

The cooling cycle may be a gas cycle or a steam cycle or a Bertier effect cycle, with the high temperature heat exchanger embedded in the preliminary fuel and the low temperature heat exchanger embedded in the secondary fluid. The exchanger is preferably mounted at the bottom of the corresponding container so that whatever the liquid level, said exchanger is submerged in the liquid.

The heat transfer bridge between the two vessels may consist of a metal rod loop that allows the secondary fluid to flow into and out of the fuel vessel. In this way, heat is transferred from the fuel to the secondary fluid, which boils back to the secondary fluid container where it condenses again. The heat transfer bridge may be provided with a valve controlled by the pressure inside the fuel container. If you don't need to keep the fuel pressure at a constant level, alternatively,
A heat transfer bridge may simply consist of a metal conductive rod joining two containers.

When using a gas refrigeration cycle, the refrigeration system may include a compressor and an expander, both of which may be piston-type and straddle-Perot types. The working fluid for the refrigeration cycle is selected to remain a gas over a range of pressures and temperatures. For example, when using liquid natural gas as the cryogenic fuel and liquid nitrogen as the secondary fluid, the working fluid may be hydrogen. A Perot type compressor/expander would be preferred because it can be completely sealed to prevent loss of working fluid.

Good thermal insulation of the tank is desirable to reduce the size and power level of the cooling system. This is the state of the ar.
t) can be achieved with cryogenic insulators. The insulator may consist of a vacuum container in which both the fuel container and the secondary fluid container are housed. The evacuated interspace is filled with a multilayer radiating insulator. moreover,
Structural supports and all external connections are designed to minimize heat transfer. Compressor/expander equipment is
Preferably, it is mounted on the outside of the tank housing, with the connections to the fuel container and the secondary fluid container passing through the tank insulation. The tank outer joint also includes a fuel inlet, a secondary fluid inlet, a gaseous fuel outlet, and a liquid fuel outlet. In order to minimize heat leakage via the tank connection, the length of the connection tube is significantly extended between the outer part and the corresponding tank vessel. The fuel container and secondary fluid container are supported inside the insulating housing by low thermal conductivity spacers or high tensile strength metal wire.

These and other objects of the invention will become readily apparent from reading the following description with reference to the accompanying drawings in which the same reference numbers are used in different drawings.

There are eight fuel tanks, each consisting of a cryogenic fuel container 10 and a secondary fluid container 12. In a preferred embodiment,
The cryogenic fuel 16 contained within the fuel container 10 is liquid natural gas. 2 housed inside the secondary fluid container 12
The next fluid 18 is liquid nitrogen. The cryogenic fuel container 10 is formed by a tubular member 10a and corresponding hemispherical or dish-shaped ends 10b, 10C attached by welding or the like to their respective ends of the tubular member 10a.

The secondary fluid container 12 includes a tubular member 12a and a tubular member 12.
- and corresponding hemispherical or dish-shaped end portions 12b, 12C attached to their respective ends by welding or the like. Secondary fluid container 12, fuel container 10, and σ
It is made of materials commonly used at cryogenic temperatures, such as aluminum, nickel steel, etc. An insulator 46 is located around the exterior of the fuel container 10 and secondary fluid container 12, said insulator 46 being made from a laminate of aluminum foil and fiberglass commonly referred to as multilayer insulation. Become one. An outer shell 14 encloses the container 10.12 and the insulation 46. The outer shell 14 consists of a tubular member 14a and corresponding hemispherical or dish-shaped ends 14b, 14C. Container 10.12 is held in place inside barrel 14 using high tensile strength wire 44.

The wire 44 is attached to the container 1 in the block 41 for attaching the support.
0.12 at each end and then secured to the container support frame 42 at location 43.

For attachment, the Zoroku 41 is attached to each end by welding or the like. Support wire 44 is made of a material that exhibits adequate tensile strength at cryogenic temperatures, such as nickel steel. Other methods may be used to support the container 10.12 inside the shell 14.

That is, methods such as using several ring spacers made of nylon or other low thermal conductivity Silasnac material around each container may be used. To help create an effective thermal barrier, the void space between the container 10.12 and the shell 14 is evacuated.

A gas cooling system consisting of a compressor 30, an expander 28, a high temperature heat exchanger 22, and a low temperature heat exchanger 24 is employed. The high temperature exchanger 22 is located inside the cryogenic fuel container 10 near the bottom of said cryogenic fuel container 10 . It consists of a single tubular member 22 with an inlet 22a and an outlet 22b. To maintain the integrity of container 10, inlet end 22a and outlet end 22b are joined to the entry point of container 10, such as by welding. Both inlet end 22a and outlet end 22b of tube 22 extend significantly in length within the space between container 10 and barrel 14. This is accomplished by coiling both of the elongated ends around the outside of the container 10. tube 2
Both ends 22L and 22b of 2 pass through the shell 14 and are sealed, such as by welding, to maintain the integrity of the shell 14 at the entry point. A cryogenic exchanger 24 is located inside the secondary fluid container 12 near the bottom of said secondary fluid container 12 . It consists of a single tubular member 24 with an inlet 24a and an outlet 24b. To maintain the integrity of the container 12, the inlet end 24- and the exit end 24b are joined to the entry point of the container 12, such as by welding. Both the inlet end 24a and the outlet end 24t) of the tube 24 extend significantly in length within the space between the container 12 and the barrel 14. This is accomplished by coiling both of the elongated ends of tube 24 around the exterior of container 12. Both ends 24a and 24t) of tube 24 pass through shell 14 and are sealed, such as by welding, to maintain the integrity of shell 14 at the entry point.

Ends 22a, 22b of tube 22 and end 24a24 of tube 24
and b, respectively, when leaving the container 14, are thermally insulated tubes 22
C, 22d and thermal insulation tubes 24C, 24d. These pipes go from the fuel tank 8 to the cooling unit 26. The cooling unit 26 essentially consists of a compressor 30, an expander 28, and a drive motor 32. Compressor 30
consists of a metal bellows 30a, a gas population valve 30b, and a gas outlet valve 30C. The material of the metal bellows 30- may be nickel steel or other metallic materials that ensure proper functioning at cryogenic temperatures. Valves 30b, 30C are mechanically controlled. The gas inlet 30b and the gas outlet 30C are
The extended portion of 6b is coupled to the cooling unit body 26a and sealed, such as by welding, to maintain the integrity of the cooling unit body 26&. The expander 28 includes a metal bellows 28-, a gas inlet valve 28b, and a gas outlet valve 28C.
It consists of The material of the metal bellows 28a may be nickel steel or other metal materials that ensure proper functioning at cryogenic temperatures. Valves 28b, 28C are mechanically controlled. Gas port 28b and gas outlet 28C are coupled to cooling unit shell 76a at an extended portion of shell 26b and sealed, such as by welding, to maintain the integrity of cooling unit shell 26-. When the gas inlets 30k) and 28b and the gas outlet 3110.28C exit the cooling unit body 26-, they are connected to the thermally insulating tubes 24d and 22d and the thermally insulating tube 2, respectively.
Combines with 2C and 24C. The bellows compressor 30 and the Perot expander 28 are actuated by an actuating rod 31, the actuating rod 31, the compressor 302, the expander 28, and the bellows 260 forming an integral part of the cooling unit body 26. combined with both. The actuating rod 31 is actuated by a bellows 26c, said bellows 260 being connected to a crank assembly 3 coupled to an electric motor 32.
It works according to 3. Electric motor 32 and crank assembly 33
is housed outside the cooling unit body 26-.

cooling unit)26. ! : The space between the body 26- is filled with a multilayer insulator 46. This cavity is evacuated to ensure proper thermal insulation is achieved. In a preferred embodiment, the working fluid 25 of the cooling cycle is:
Hydrogen was chosen. Hydrogen has the advantage of remaining as a gas over the entire pressure and temperature range of the refrigeration cycle. Hydrogen is advantageous because it generally retains high specific heat values within the cryogenic range of the cycle.

Although in this preferred embodiment a Perot-type compressor-expander arrangement is selected, it can be appreciated that any suitable cooling device, piston-type or Peltier-effect type or other types, may be used. .

6 The heat exchange portion 20c of the heat exchange bridge 20 is connected to the fuel container 1.
0 near the bottom of the fuel container 10 inside the fuel container 10.

The heat exchanger 20C consists of a single tubular member, the single tubular member having an inlet end 20- that enters near the bottom of the fuel container 10 and an outlet end 20b that exits near the top of the container 10. and. During the storage period, secondary fluid 18 may fill heat exchanger 211C when valve 48 is opened. In exchanger 20C, heat is absorbed by secondary fluid 18 which evaporates and returns to secondary fluid tank 12 via outlet end 20b. Valve 48 is thus controlled by the pressure inside fuel container 10 being maintained at a constant predetermined level. To maintain the integrity of container 10, inlet end 20- and outlet end 20b are sealed, such as by welding, at their points of entry. End 20 of bridge 20
a enters the secondary fluid container 12 near the bottom of said secondary fluid container 12 . The end 20b of the bridge 20 enters the secondary fluid container 12 near the top of said secondary fluid container 12. To preserve the integrity of the container 12, both ends 2na- and 20b are sealed, such as by welding, at their point of entry into the container 12. The solenoid valve 48 is positioned at the pipe end 20a at a position immediately after the pipe end 20a exits the secondary fluid container 12.

The electromagnetic valve 48 is operated in a static manner by the electric line 481k. Said electrical line 48a has a significantly extended length in the space between the container 10.12 and the outer circumference 14.

The electrical line 4B& exits the outer circumference 14 via an electrical feedthrough in an elongated portion 148 of the outer circumference.

Gaseous fuel extraction tube 36 extends outwardly through the top of fuel container 10 . To maintain the integrity of the fuel container 10, the tube 36 is sealed at its exit point, such as by welding. By arranging the tube 361-t exiting the container 10 in a coiled manner around the outside of the fuel container 10, the length of the tube 361-t is significantly increased. Gaseous fuel extraction pipe 36
passes through the outer periphery 14 at the extended outer periphery 14Q, and in order to maintain the integrity of the shell 14, the extended outer periphery 14eKs is sealed by welding or the like.

The limb extraction tube 34 passes through the bottom of the fuel container 10 and extends to the outside. To preserve the integrity of the fuel container 10,
34 pipes are placed at their exit points and sealed by welding or the like. The pipe 34 exiting the container 10 connects the pipe 34 to the fuel container 10.
The length is significantly increased by placing it in a coil around the outer part of the ↑4. 34 liquid fuel extraction tubes pass through the outer periphery 14 into the extended portion 14e of the shell and are connected to the shell 14.
In order to preserve the integrity of the elongated portion 1 of said torso
4e and sealed by welding or the like. Gaseous fuel pipe 3
Upon exiting the shell 14, both the fuel tubes 6 and the liquid fuel tubes 34 are coupled to thermally insulated tubes 36a, 34a, respectively, which convey fuel to the engine.

The fuel charge tube 40 extends upwardly through the bottom of the fuel container 10 to near the top of the fuel container 10 . To maintain the integrity of the fuel container 10, the charge tube 40 is sealed, such as by welding, at its point of entry. The pipe 40 exiting the fuel container 10 is
By arranging it in a coil around the outside of the fuel container 10, the length is significantly increased.

A fuel charge tube 40 passes through the outer circumference 14 at the extended portion 14f of the shell to maintain the integrity of the shell 14.
The extended portion 14f of the front H1 body is sealed by welding or the like. Fuel charging line 40 (-1', outer circumference 14
After passing through, it connects to a fuel charging valve 55 and a pressure relief valve 54.

Secondary fluid charge tube 38 extends upwardly through the bottom of secondary fluid container 12 to near the top of container 12 . 2
To maintain the integrity of the fluid container 12, the tube 38 is
The entry point is sealed by welding or the like. The tube 38 exiting the secondary fluid container 12 connects said tube 38 to the secondary fluid container 1.
The length is significantly extended by coiling around the outer part of the 2. The secondary fluid charge tube 38 passes through the barrel 14 at the extended section 14g of the barrel to maintain the integrity of the barrel 14.
It is sealed by welding etc. Secondary fluid charging pipe 38
After passing through shell 14 , it connects to secondary fluid charge valve 57 and pressure relief valve 56 .

Two sensors 51 , 50 also enter the interior of the fuel container 10 . The sensor 51 is a pressure temperature sensor, and the sensor 51 is a pressure temperature sensor.
0 is the fuel level sensor.

The sensor is joined to the fuel container 10 by welding, etc. to maintain the integrity of the fuel container 10.

The sensor holder is connected to the outside by a sensor line 51, 50&, and the sensor line 51a.

50a has a significantly extended length in the space between fuel container 10 and outer circumference 14. Sensor line 51. ．． 5n& exits the barrel 14 via an electrical feed'-through in the extended portion i4e of the barrel.

Two sensors 53 , 52 also enter the interior of the secondary fluid container 12 . Sensor 53 is a pressure temperature sensor and sensor 52 is a liquid level sensor. Secondary fluid container 1
Sensors 53.52u are joined to the secondary fluid container 12 by welding or the like to maintain the integrity of the fluid container 12. The sensor cages are connected to the outside by sensor lines 53a, 52a, which have a length that extends significantly into the space between the container 12 and the outer shell 14. Sensor line 53a, 5? There is an electrical feedthrough in the extended section 14e of the torso.
-through) Escape from the torso 14 via f.

The cryogenic fuel tank of the present invention has two different operating modes: a fuel storage mode and a fuel supply mode.

In the fuel storage mode of operation, 16 cryogenic fuels are being stored for later use.

A primary objective of the present invention is to provide long-term storage of highly volatile cryogenic fuels by avoiding fuel vapor pressure build-up and the need for venting. Cryogenic fuels are highly volatile, so when the engine is not using fuel, even a small amount of heat leaking from the surrounding environment into the interior of the fuel container can cause a rapid pressure rise that can exceed safe levels. This requires evacuation, and the need for this evacuation has been designed to date. In the cryogenic fuel tank according to the present invention, b.
By periodically flowing the cooled secondary fluid 18 from the secondary fluid container 12 through the heat exchanger bridge 2° inserted inside the fuel container 10, pressure build-up and subsequent discharge are eliminated. . The secondary fluid 18 that has entered the interior of the heat exchange bridge 2° is boiled by the heat absorbed from the reserve fuel, returns to the vessel 12 as a vapor, and condenses there again. Thus, during the storage mode, heat is continuously extracted from the reserve fuel 16 and dumped into the secondary fluid 18. As a result, the entire amount of heat leaked away from the surrounding environment will be transferred into the secondary fluid 18. During the storage mode, 2
Although the fluid temperature increases, the temperature (and pressure) inside the fuel container does not change during the storage period.

In the fueling mode of operation, fuel is being released from the fuel container 10 and consumed by the engine, etc., while a cooling system is operating between the containers 10 and 12 to remove heat from the secondary fluid container 12. The heat is removed and the heat is dissipated into the interior of the fuel container 10. The heat thus applied to the fuel container 10 serves to evaporate a portion of the fuel and to maintain the capacity necessary for a proper supply of fuel to the engine. The heat extracted from the secondary fluid 18 serves to restore the initially cold state of the secondary fluid 18 required for the next storage period.

Of course, since the secondary fluid temperature cannot be lowered infinitely and is preferably not lower than the freezing point of the secondary fluid, the length of the storage period will ultimately The amount of secondary fluid 18 is determined by the amount of secondary fluid 18. nevertheless,
For most practical applications, even if the secondary fluid is relatively small, the length of the storage period without evacuation of the secondary fluid 18 or fuel 16 will be long enough, e.g. For the preferred embodiment described, 75.706 liters (20 gallons) of liquid natural gas as the fuel and 37.853 liters (10 gallons) of liquid nitrogen as the secondary fluid.
A well-insulated tank capable of containing fuel can be stored for periods longer than one month without draining the fuel. If the storage period exceeds a time interval determined by the total heat capacity of the secondary fluid 18, the pressure inside the secondary fluid container 12 will increase above a predetermined safe level and a certain amount of the secondary Fluid 18 is automatically discharged via outlet 56. This process continues until all secondary fluid 18 is drained or the operating mode is changed. All secondary fluids 1
After 8 has been discharged, if the tank is in the dead storage mode,
The pressure inside fuel container 10 increases above a predetermined safe level and a quantity of gaseous fuel is automatically expelled via outlet 54 . This process continues until all fuel is drained or the operating mode is changed. If any secondary fluid 18 is lost due to drainage during storage, the lost portion of the secondary fluid 18,
must be compensated. Before the secondary fluid 18 is even slightly discharged, an alarm may be activated by the pressure sensor 53 inside the secondary fluid container 12 to warn the operator of the remaining pressure. In fuel supply mode 2, fuel is being supplied from the tank in both gaseous and liquid form.

Gaseous fuel escapes via gaseous fuel pipe 36 that connects to gaseous fuel line 36a and gaseous fuel control valve 37. Liquid fuel escapes via liquid fuel pipe 34 that connects to thermally insulated liquid fuel line 34a and liquid fuel control valve 35.

The pressure inside the fuel container 10 monitored by the sensor 51 is controlled by actuating the cooling unit 26 and the valve 37 depending on the fuel consumption rate.

Cryogenic fuel container 10 is filled to the appropriate level with cryogenic fuel 16 via fuel charge pipe 40 coupled to fuel charge valve 55 . Fuel level is monitored by sensor 50. The secondary fluid container 12 includes a secondary fluid charging valve 5.
Via 7, the secondary cryogenic fluid 18 is filled to the appropriate level.

The level of secondary fluid 18 is monitored by sensor 52.

Various modifications may be made to the cryogenic fuel tank of this preferred embodiment without departing from the spirit and scope of the invention as defined by the appended claims.

[Brief explanation of drawings]

Fig. 1 is a diagram showing a vertical cross section of the fuel tank and a cross section of the cooling device, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 6 shows the fuel container and FIG. 6 is a vertical cross-sectional view of the secondary fluid container. 8... Cryogenic fuel tank, 10... Fluid-tight cryogenic fuel container, 10b... First end of fluid-tight cryogenic fuel container, 10c... Second end of fluid-tight cryogenic fuel container Part, 12
... Fluid-tight secondary cryogenic fluid container, 12b... First end of fluid-tight secondary cryogenic fluid container, 12c... Fluid-tight 2
second end of cryogenic fluid container, 14... fluid can outer body, 14b... first end of fluid can outer shell, 14C...
Second end of fluid can outer shell, 16...Cryogenic fuel, 18
...Secondary cryogenic fluid, 20...Heat exchanger bridge,
22... High temperature heat exchanger, 24... Low temperature heat exchanger, 2
5... Cooling working fluid, 26c... Metal Perot, 28
... Expander, 3o... Compressor, 31... Operating 8 rod, 32... Electric motor, 33... Crank operation assembly, 34... The cryogenic fuel is transferred to the cryogenic fuel container 36... A device for extracting the cryogenic fuel from the cryogenic fuel container, 38... A device for filling the secondary cryogenic fluid container with the secondary cryogenic fluid, 40...
- A device for filling the cryogenic fuel into the cryogenic fuel container;
42... Metal frame attached to the outer periphery, 43...
- Attachment is at point 44...A device for supporting the cryogenic fuel container and the secondary cryogenic fluid container inside the outer shell, 4
6...A device for thermally insulating the cryogenic fuel container and the secondary cryogenic fluid container, 50...A device for monitoring the liquid level of the cryogenic fuel and the secondary cryogenic fluid, 51.
...A device for monitoring the pressure and temperature of the cryogenic fuel container and the secondary cryogenic fluid container, 52...Monitoring the liquid level of the cryogenic fuel and the secondary cryogenic fluid. device for monitoring the pressure and temperature of the cryogenic fuel container and the secondary cryogenic fluid container, 54.
... a device for discharging the cryogenic fuel from the cryogenic fuel container; 56... a device for discharging the secondary cryogenic fluid from the secondary cryogenic fluid container; Agent: Akira Asamura Continuation of page 1) Applicant: Nicolas Archer Sanders 1022 Twenty-Seventh Avenue Southeast, Minneapolis, Minnesota, United States of America Procedural Amendment (Salmon) Patent Office Director-General 1, Indication of the case, Patent Application No. 125144 filed in 1980, Cryogenic Fuel Tank 3, Person making the amendment, Relationship to the case, Patent Applicant 4, Attorney 5, Date of the amendment order, Month, Day 6, 1939, Amendment Number of inventions increased by 8, contents of amendment as attached

Claims (1)

[Scope of Claims] (1) A fluid-tight cryogenic fuel container having a first end and a second end and containing a certain amount of cryogenic fuel; and a cooling device having a fluid-tight secondary cryogenic fluid container containing a certain amount of secondary cryogenic fluid, a high temperature heat exchanger, a low temperature heat exchanger, a compressor, an expander, and a cooling working fluid; a high temperature heat exchanger is located within the cryogenic fuel container and is part of the cooling system; and a low temperature heat exchanger is located within the secondary cryogenic fluid container and is part of the cooling system. a heat exchanger bridge passing through the cryogenic fuel container and coupled to the secondary cryogenic fluid container; having a first end and a second end; a fluid can outer shell enclosing and accommodating the secondary fluid container; a device for supporting the cryogenic fuel container and the secondary cryogenic fluid container inside the outer shell; an apparatus for filling fuel; an apparatus for extracting the cryogenic fuel from the cryogenic fuel container; an apparatus for filling the secondary cryogenic fluid container; a device for discharging the secondary cryogenic fluid from the container; and a device for discharging the secondary cryogenic fluid from the container;
A cryogenic fuel that can be used together with an engine or the like that consumes cryogenic fuel during operation, comprising a device for discharging a secondary cryogenic fluid container, and a device for thermally insulating the cryogenic fuel container and the secondary cryogenic fluid container. tank. r2+ 'I? A cryogenic fuel tank according to claim 1, characterized in that said cryogenic fuel is liquid natural gas. (3) The cryogenic fuel tank according to claim 2, wherein the secondary cryogenic fluid is liquid nitrogen. (4) The cryogenic fuel tank according to claim 2, wherein the cooling working fluid is hydrogen. (5) A cryogenic fuel tank according to claim 1, wherein the cryogenic fuel is liquid hydrogen. (6) Percentage of cryogenic fuel according to claim 5. 2. A cryogenic fuel tank, wherein the secondary cryogenic fluid is liquid hydrogen. (Power) The cryogenic fuel tank according to claim 6, wherein the cooling working fluid is hydrogen. (8) The cryogenic fuel tank according to claim 5, wherein the cooling working fluid is hydrogen. In the cryogenic fuel tank, the secondary cryogenic fluid is liquid helium. (9) In the cryogenic fuel tank according to claim 8, the cooling working fluid is A cryogenic fuel tank characterized by being made of helium. (10) In the cryogenic fuel tank according to claim 1, the cryogenic fuel tank is characterized in that the cooling device utilizes a gas cooling cycle. (1υ) The cryogenic fuel tank according to claim 1, wherein the cooling device utilizes a vapor cooling cycle. The cryogenic fuel tank according to claim 1, wherein the heat exchange bridge comprises a metal tube through which the secondary cryogenic fluid flows.f13) Claim according to claim 12. A cryogenic fuel tank characterized in that the heat exchange bridge further includes a device for controlling the flow of the secondary cryogenic fluid. A cryogenic fuel tank according to claim 1, characterized in that said heat exchange bridge comprises a thermally conductive metal rod. , the support device comprises high tensile strength wire stretched from an end of the cryogenic fuel container and an end of the secondary cryogenic fluid container to a metal frame attached to the outer shell; (16) In the cryogenic fuel tank according to claim 1, the thermal insulation device is arranged between the cryogenic fuel container and the outer shell and between the secondary electrode. extending the length of all tubes coupled between cryogenic fluid containers and the outer shell by coiling the tubes around the outer portions of their respective containers; (17) The cryogenic fuel tank according to claim 1, wherein the compressor and the expander are of a piston-cylinder type. Low-temperature fuel tank. (Country) The cryogenic fuel tank according to claim 1, characterized in that it is constituted by the compressor, the expander, and a metal bellow. (1'J) In the cryogenic fuel tank according to claim 1, the compressor and the expander are housed in a fluid-tight thermally insulating container and located outside the thermally insulating container. A cryogenic fuel tank according to claim 1, characterized by a device for monitoring the pressure and temperature of the crank actuating assembly and the electric motor through the actuating rod and the metal perot. 21) The cryogenic fuel tank according to claim 1, characterized by a device for monitoring the liquid levels of the cryogenic fuel and the secondary cryogenic fluid. A cryogenic fuel type according to claim 1, characterized by a device for controlling the pressure. A cryogenic fuel tank characterized by comprising a valve. (2. The cryogenic fuel tank according to claim 1 is provided with a Peltier effect cooling unit in place of the compressor and the expander. A cryogenic fuel tank characterized in that a cryogenic fuel tank is used (two cryogenic fuel tanks described in the specification and disclosed in the drawings).