Compression device and filling station comprising such a device

Abstract

The present invention relates to a device for compressing cryogenic fluids in at least one compression stage, the device comprising at least one sleeve and at least one piston defining at least one compression chamber, a rod capable of translational movement along a longitudinal axis, the rod being connected to the piston or the sleeve and capable of alternating movement in two opposite directions to ensure a compression stage of the fluid and an inlet stage of the fluid into at least one compression chamber by moving at least one piston and at least one sleeve in a relative manner, the rod comprising in the longitudinal direction a portion with a reduced cross-section that separates two adjacent portions of the rod, the rod further comprising at least one connecting element made of a material having a lower thermal conductivity than the material constituting the rod, the two ends of the at least one connecting element being respectively connected to two adjacent portions of the rod. The present invention also relates to a station for filling a pressurized gas storage tank.

Description

Field of the Invention

[0001] The present invention relates to a compression device, in particular a compression device for cryogenic fluids, and to a filling station comprising such a device.

[0002] More specifically, the present invention relates to a device for compressing cryogenic fluids in at least one compression stage, the device comprising at least one sleeve defining at least one compression chamber and at least one piston, a rod displaceable in translational movement along a longitudinal axis, said rod being connected to said at least one piston or to said at least one sleeve and being displaceable alternately in two opposite directions to ensure a compression phase of the fluid and an inlet phase of the fluid into said at least one compression chamber by moving said at least one piston and said at least one sleeve in a relative manner.

[0003] The density of cryogenic fluids is much higher than that of gaseous fluids. Thus, cryogenic pumps (in contrast to gas compressors) provide a higher mass flow rate, a smaller footprint, consume less energy and require less maintenance. Accordingly, cryogenic pumps are used in many fields such as units for separating gases from air, reformers, filling stations, the maritime sector.

[0004] The fluids under discussion generally include oxygen, nitrogen, natural gas, argon, helium or hydrogen. These compression devices (or pumps) have the function of pressurizing cryogenic fluids to a target flow rate. The present invention particularly relates to a device for compressing or pumping cryogenic gases and / or liquids.

[0005] Hereinafter, in particular, the terms "compression device" and "pump" may be used interchangeably, and the terms "pumping" and "compressing" may also be used interchangeably. Specifically, the device which is the subject of the present invention is a device for pumping and / or compressing liquid and / or gaseous and / or supercritical cryogenic fluids.

[0006] For example, cryogenic piston pumps can be placed directly in line at the outlet of a cryogenic source reservoir or directly in a dedicated cryogenic bath (also called a "sump") located next to the main storage tank and fed directly by the main storage tank.

[0007] For various reasons, particularly for ease of maintenance and design, cryogenic pumps generally exhibit alternating movements and are inserted into storage tanks so as to be immersed in the cryogenic fluid to be pumped.

[0008] The inlet pressure of cryogenic pumps is generally from 1 bar to 20 bar and the outlet pressure is generally from 20 bar to 1000 bar, depending on the application. The pump may have one or more compression stages using reciprocating movement.

[0009] Pumps for high pressure and medium flow rates often exhibit an alternating movement in two phases: one phase for intake (in one direction) and one phase for delivery (in the other direction). Check valves (usually two per compression stage: one for the inlet or intake and one for the outlet or delivery) enable the volume of a fixed amount of fluid to be reduced by relative translational movement between the piston and the sleeve, thereby increasing the pressure of the fixed amount of fluid. Background Art

[0010] Regarding the mechanical power and force required for movement, the two translational strokes have different design requirements. The intake stroke is typically at a pressure of 1 bar to 20 bar, while the compression stroke can be as high as 1000 bar. Therefore, these two strokes are subject to very different mechanical and pressure stresses.

[0011] Therefore, the material and cross-section of the shaft connecting the cold head of the cryogenic pump to the actuating mechanism (motor, etc.) are designed for the maximum stress experienced by the shaft, i.e., for the most demanding / requirement-rich stroke (in the case shown here, the high-pressure compression).

[0012] For cryogenic applications, the heat conducted through the shaft should be minimized to limit the thermal impact on the main compression chamber. Limiting the conduction through the shaft also limits the heat input between the ambient temperature and the cryogenic temperature of the liquefied gas when the pump is stopped or in the "standby" state. This reduction in the conduction of the shaft reduces the heat input to the liquid bath whether the pump is in operation or not, and thus reduces the evaporation of the liquefied gas.

[0013] Therefore, the main characteristics of the shaft of a cryogenic pump with alternating movement are: the ability to transfer a large amount of force and power from the actuating mechanism to the cold head and the ability to minimize the heat input into the cold head.

[0014] It is difficult to meet these two conditions.

[0015] Currently, the moving drive shaft is formed by long metal rods, which increase the space requirements, wear, and complexity of guidance in the axial direction. Summary of the Invention

[0016] The object of the present invention is to remedy all or some of the drawbacks of the prior art presented above.

[0017] To this end, the compression device according to the invention and also according to its general definition given in the preamble above is mainly characterized in that: the shaft rod includes a portion with a reduced cross-section in the longitudinal direction, the portion with the reduced cross-section separates two adjacent portions of the shaft rod, the shaft rod further includes at least one connecting element, the at least one connecting element is made of a material with a lower thermal conductivity than the material of the shaft rod, the at least one connecting element is made of a composite material in particular, and two ends of the at least one connecting element are respectively connected to the two adjacent portions of the shaft rod.

[0018] Therefore, the present invention makes it possible to limit the heat input through the movable shaft rod of the cryogenic pump.

[0019] In addition, embodiments of the present invention may include one or more of the following features:

[0020] - Compared with the cross-sectional area of the rest of the shaft rod, the cross-sectional area of the shaft rod in the portion with the reduced cross-section is reduced by 30% to 85% and preferably by 65% to 80%.

[0021] - The at least one connecting element includes a cable.

[0022] - The device includes a plurality of cables arranged around the portion with the locally reduced cross-section.

[0023] - The size of the portion with the reduced cross-section is set such that when the shaft rod moves in a first direction, a given compressive load is transmitted between the two adjacent portions, and the size of the at least one connecting element and possibly also the portion with the locally reduced cross-section is set such that when the shaft rod moves in a second direction opposite to the first direction, a given tensile load is transmitted between the two adjacent portions, and the compressive load is less than the tensile load.

[0024] - The compressive load is 1% to 50% of the tensile load, preferably 2% to 25%.

[0025] - The two adjacent portions of the shaft rod are separated from each other.

[0026] - The device has an insulating material layer inserted between the two adjacent portions.

[0027] - The connecting element is made of at least one of the following materials: Kevlar fiber, fiberglass, epoxy resin with carbon fiber.

[0028] - The device is of the single compression stage type and includes: a housing that houses a single compression chamber; an inlet system that communicates with the compression chamber and is configured to allow the fluid to be compressed to enter the compression chamber; a movable piston for ensuring the compression of the fluid in the compression chamber. The device further includes a discharge orifice that is configured to allow the compressed fluid to be discharged from the compression chamber.

[0029] - The device is of the two compression stage type and includes: a first compression chamber; a second compression chamber; an inlet system that communicates with the first compression chamber and is configured to allow the fluid to be compressed to enter the first compression chamber; a delivery system that communicates with the first compression chamber and the second compression chamber and is configured to allow the fluid to be delivered from the first compression chamber to the second compression chamber; a movable piston for ensuring the compression of the fluid in the first compression chamber and the second compression chamber. The device further includes a discharge orifice that communicates with the second compression chamber and is configured to allow the compressed fluid to be discharged. The second compression chamber is defined by a part of the body of the piston and a fixed wall of the device. The inlet system is located at a first end of the device, the discharge orifice is located at a second end of the device, and the delivery system is located between the inlet system and the discharge orifice.

[0030] - The device is housed in a sealed enclosure containing a cryogenic cooling fluid bath.

[0031] The present invention also relates to a station for filling a pressurized gas storage tank, the station including a source of liquefied gas (in particular liquefied hydrogen) and an extraction circuit that includes a first end connected to the source of liquefied gas and at least a second end intended to be connected to the storage tank to be filled. The extraction circuit includes a device for compressing a fluid or a pumping device according to one of the above or below features.

[0032] The present invention may also relate to any alternative device / installation or method including any combination of the above or below features that fall within the scope of the claims. Description of the Drawings

[0033] Other specific features and advantages will become apparent by reading the following description with reference to the accompanying drawings, in which:

[0034] Figure 1 A schematic partial view is shown that shows an example of a filling station where a compression device can be used;

[0035] Figure 2 is a schematic partial cross-sectional view along the longitudinal and vertical directions showing the structure of a first exemplary embodiment of the compression device according to the present invention;

[0036] Figure 3is a schematic partial cross-sectional view along the longitudinal and vertical directions showing the structure of a second exemplary embodiment of a compression device according to the present invention;

[0037] Figure 4 is a schematic partial cross-sectional view along the longitudinal and vertical directions showing details of an example of the structure of a shaft of a compression device according to the present invention;

[0038] Figure 5 shows Figure 4 a perspective view of the details in Detailed Description

[0039] The present invention can be applied to any device for compressing cryogenic fluids having at least one compression stage.

[0040] In Figure 2 the example in , the compression device 1 belongs to the single compression stage type. The device 1 includes a single compression chamber 3 and an inlet system 2 communicating with the compression chamber 3, and the inlet system 2 is configured to allow the fluid to be compressed to enter the compression chamber 3.

[0041] The inlet system 2 can include, for example, at least one of the following: one or more check valves, one or more orifices or holes, at least one plate valve, or any other device or valve that allows the fluid to be compressed to enter the compression chamber 3 during the inlet stage and blocks the fluid from flowing out during the compression stage. In particular, the inlet system 2 opens when there is a given pressure difference between its two ends. Additionally, the compression chamber 3 can optionally be equipped with a pressure relief valve or some other safety element configured to limit the pressure in the compression chamber below a given safety threshold.

[0042] The compression chamber 3 is defined by a part of the body of the piston 5 and the fixed wall of the device. The piston 5 is capable of translational movement in the longitudinal direction A.

[0043] The piston 5 can have a tubular portion mounted around a fixed central guide 8 at its first end.

[0044] As shown, the compression chamber 3 can be formed in a tubular cavity or a fixed chamber in the piston 5, and the cavity or chamber is closed at this first end. The compression chamber 3 can thus be defined at its lower part by the closed tubular lower end of the piston 5. The inlet system 2 can be located at the front end of the piston 5.

[0045] The rear end of the piston 5 can be mounted to slide relative to a fixed transverse plate held by longitudinal columns. The structure of the piston 5 is designed to allow a part (the rear part) of the piston 5 to slide in the plate (or other support).

[0046] For example, the lower part of the piston 5 is tubular (and forms the compression chamber 3), while the opposite part (upper part) of the piston 5 is designed to allow sliding relative to the support plate. For example, the upper part of the piston 5 has one or more openings for the passage of plates or supports. The piston 5 can be made as a single piece or as multiple pieces joined / fixed together.

[0047] The first end of the central guide 8 can form a fixed wall that defines the second end of the compression chamber 3. The remainder of the compression chamber 3 is defined by a sealing system 10 (sections, etc.) formed between the central guide 8 and the piston 5.

[0048] In other words, the tubular part of the piston 5 forms an enclosure around the entire compression chamber 3. Thus, the compression chamber 4 can be fully accommodated within the tubular part of the piston 5. Thus, the piston 5 can constitute the housing of the compression chamber 3. As described below, this structure enables the compression chamber 3 to be confined within the piston 5, the walls of which can be effectively thermally insulated (i.e., kept cold).

[0049] The device 1 also includes a discharge orifice 7 configured to allow the compressed fluid to discharge from the compression chamber 3.

[0050] The discharge orifice 7 can be provided with a check system, which can be of the same type as the inlet system 2 (e.g., closing as long as the pressure difference between the compression chamber 3 and the outside is below a given threshold).

[0051] The piston 5 is fixed to a shaft 15, for example a metal shaft, which is capable of translational movement along the longitudinal axis A.

[0052] The shaft 15 and thus the piston 5 are capable of alternating movement in two opposite directions to ensure the compression phase (in this example, the shaft 15 is subjected to a tensile load) and the phase of fluid entry into the chamber 3 (the shaft 15 is subjected to a compressive load).

[0053] According to an advantageous specific feature, the shaft 15 includes a portion 151 with a locally reduced cross-section longitudinally located between two adjacent portions 153, 154 of the shaft 15 and at least one connecting element 155 made of a material with poor thermal conductivity, the two end portions of which are respectively joined to the two adjacent portions 153, 154 of the shaft 15.

[0054] In particular, the dimensions of the portion 151 with a reduced cross-section can be determined such that a given compressive load is transmitted between two adjacent portions 153, 154 when the shaft 15 moves in the first direction, while the partial dimension (or dimensions) of the at least one connecting element 155 (and possibly the portion 151 with a locally reduced cross-section) is set such that a given tensile load is transmitted between two adjacent portions 153, 154 when the shaft 15 moves in the second direction opposite to the first direction. The compressive load can be significantly less than the tensile load.

[0055] Preferably, the cross-section of the shaft 15 is reduced to a value equal to or greater than a minimum value at which the stress borne by the shaft 15 does not exceed the maximum allowable stress on the material from which it is made.

[0056] This causes the cross-section of the shaft 15 to be at least locally dimensionally reduced in order to reduce heat conduction in the axial direction. Specifically, the reduced cross-section and the structure of the connecting element 155 are such that heat conduction between the relatively cold parts and the relatively hot parts of the device 1 can be reduced.

[0057] By means of the connecting element 155, this reduction in cross-section does not weaken the mechanical properties of the shaft 15, which connecting element 155 at least partially bears the greater tensile load (tension on the shaft) during the compression phase. The composite structure of the connecting element 155, for example, also promotes lower heat transfer along the shaft 15. For example, the at least one connecting element 155 can be made of at least one of the following materials: Kevlar fiber, fiberglass, epoxy resin with carbon fiber, or any other material that can withstand tensile loads and has a lower thermal conductivity than the metals or alloys commonly used for manufacturing shafts.

[0058] Thus, the upper and lower parts of the shaft 15 can be connected by cables 155, wires, composite braids, and can be simply in contact by joining the cables 155 to their metallic parts. This results in additional thermal insulation.

[0059] The advantage of these materials is that they have a greater breaking strength and a lower thermal conductivity than metals. These composite materials have a very high tensile strength and a lower compressive strength. However, according to the arrangement of the present invention, these connecting elements basically all or only bear loads during tensioning. During the compressive load phase of the shaft, the portion 151 with a locally reduced cross-section bears all or most of the load or stress. This is because the structure of the rod or cable 155 does not allow the cable to bear compressive loads (for example, through the slack or relative flexibility of the cable 155). In addition, it is conceivable (although not a preferred embodiment) that during tensioning, two adjacent portions 153, 154 of the shaft 15 move away from each other during tensioning and abut against each other during compression.

[0060] For example, during the compressive movement of the shaft rod (e.g., upward compression when the device is vertically oriented), the shaft rod 15 is pulled upward by the upper portion 153 connected to the motor 21. The connecting element 155 is tensioned under the pull and thus transmits the force to the lower portion 154. During the downward stroke, when only a small part of the upward / downward force is required, the upper portion 153 moves downward and pushes the lower portion 154. A smaller contact surface is sufficient to transmit the compressive load downward.

[0061] Compared with the cross-sectional area of the rest of the shaft rod 15, the cross-sectional area of the shaft rod 15 in the portion 151 with reduced cross-section is reduced by 30% to 85%, preferably by 65% to 80%. In other words, compared with the normal size of the shaft rod 15 in the prior art embodiments, the present invention allows for a local reduction in the effective size, which reduces heat conduction but does not endanger the requirements for the mechanical integrity of the passage of loads, especially tensile loads.

[0062] The portion 151 with reduced cross-section may be formed along a short length, for example, up to 5% of the length of the shaft rod 15.

[0063] For example, the reduction of the cross-section is suitable for the load during entry, which may account for 1% to 50% of the tensile load, preferably 2% to 25%.

[0064] The at least one connecting element 155 may include a plurality of cables 155 or rods, and the two ends of the cables or rods are respectively fixed to two adjacent portions 153, 154 of the shaft rod 15 (e.g., the upper portion and the lower portion respectively).

[0065] As shown in the figure, the cables 155 may be distributed around the portion 151 with locally reduced cross-section.

[0066] The two adjacent portions 153, 154 of the shaft rod 15 located on both sides of the portion 151 with reduced cross-section may be an integral piece or may be separate pieces (these separate pieces having the same composition or different compositions).

[0067] As in Figure 4 shown, at least one layer of thermal insulation material layer 156 may be interposed between the two adjacent portions 153, 154 (e.g., at the portion 151 with locally reduced cross-section). This layer may include, for example: glass fiber, hard steel or chrome steel, polymers of the PTFE type, etc.

[0068] As Figure 3 shown, such a special feature structure may also be applied to a compression device having two compression stages.

[0069] This non-limiting example of the compression device 1 includes a first compression chamber 3, a second compression chamber 4, and an inlet system 2 in communication with the first compression chamber 3. The inlet system 2 is configured to allow the fluid to be compressed to enter the first compression chamber 3 (for possible implementations of the inlet system 2, see above). The device 1 also includes a delivery system 6 in communication with the first compression chamber 3 and the second compression chamber 4. The delivery system 6 is configured to allow the fluid to be delivered from the first compression chamber 3 to the second compression chamber 4 (the type of the delivery system 6 may be the same as that of the delivery system of the above inlet system).

[0070] The device also includes a movable piston 5 for ensuring the compression of the fluid in the first compression chamber 3 and the second compression chamber 4. The device 1 also includes an outlet orifice 7 in communication with the second compression chamber 4. The outlet orifice is configured to allow the compressed fluid to be discharged. The discharge system may have the same type of valve system as described above.

[0071] As shown in the figure, the second compression chamber 4 may be defined by a part of the body of the piston 5 and the fixed wall of the device. In addition, the piston 5 may have a tubular portion mounted around a fixed central guide 8. The end of the central guide 8 may form a fixed wall that defines a part of the second compression chamber 4. The device 1 includes a sealing system 10 formed between the central guide 8 and the piston 5. The inlet system 2 is located at the first end of the device 1, the outlet orifice 7 is located at the opposite second end of the device, and the delivery system 6 is preferably located between the inlet system 2 and the exhaust orifice 7.

[0072] More generally, the present invention can be applied to any compression device including a shaft 15 driven by a drive member 21 and connected to a (piston / sleeve) mechanism for compressing a fluid, particularly a cryogenic fluid.

[0073] As shown in the figure, the compression system and preferably the compression device 1 can be accommodated in a thermally insulated sealed housing 130 that contains a cryogenic cooling fluid bath 16.

[0074] In particular, the first compression chamber 3 and / or the second compression chamber 4 can be immersed in the liquid phase. The upper part of the housing 16 may have a gas headspace that collects any leaks in the device 1.

[0075] Therefore, the cold head of the device 1 can be vertically immersed in the cryogenic bath (sometimes referred to as a "sump").

[0076] In the case of two compression stages, the first compression stage collects the low-pressure fluid and then moves the fluid along the longitudinal axis A towards the second compression stage by compression. The high-pressure fluid then exits the second compression stage upwards (when the axis A is not horizontal).

[0077] Thus, the present invention enables the use of a metal rod or shaft 15 with an improved thermal barrier. The composite or equivalent material is preferably used under tension during high-pressure travel, while the metal section is used under compression.

[0078] The dimensions of the cross-section of the shaft can be determined to transmit the necessary force / power during the entry stroke, and thus, its cross-section is much smaller compared to the dimensions determined for the load during the fluid compression stroke.

[0079] Compared with the prior art, this can reduce the length of the shaft 15 while improving the thermal performance when the shaft 15 is subjected to large thermal gradients.

[0080] This type of compression device 1 (or multiple devices in series or parallel) can be used in any cryogenic facility that requires pumping or compressing cryogenic fluids.

[0081] For example, a station for filling a pressurized gas storage tank (the pressurized gas being, for example, hydrogen) may include a source 17 of liquefied gas, an extraction circuit 18, a first end of the extraction circuit 18 being connected to the source and at least one second end being intended to be connected to the storage tank 190 to be filled, the extraction circuit 18 including such a pumping device 1. The fluid being pumped can evaporate in a downstream exchanger 19 and optionally can be stored in one or more pressurized buffer storage tanks 20.

Claims

1. An apparatus (1) for compressing a cryogenic fluid in at least one compression stage, the apparatus comprising at least one sleeve (13, 14) defining at least one compression chamber (3, 4) and at least one piston (5, 8), a rod (15) capable of translational movement along a longitudinal axis (A), the rod (15) being connected to the at least one piston or the at least one sleeve and being capable of alternating movement in two opposite directions to ensure a compression stage of the fluid and an inlet stage of the fluid into the at least one compression chamber (3, 4) by moving the at least one piston (5) and the at least one sleeve (13, 14) in a relative manner, the rod (15) comprising, along the direction of the longitudinal axis (A), a portion (151) with a reduced cross-section, the portion (151) with a reduced cross-section separating two adjacent portions (153, 154) of the rod (15), the rod (15) further comprising at least one connecting element (155) made of a material having a lower thermal conductivity than the material constituting the rod (15), the two ends of the at least one connecting element (155) being respectively connected to the two adjacent portions (153, 154) of the rod (15), characterized in that, The cross-sectional area of the shaft (15) in the portion (151) where the cross-section is reduced is reduced by 30% to 85% compared to the cross-sectional area of the rest of the shaft (15).

2. The device according to claim 1, characterized in that, The at least one connecting element (155) includes a cable.

3. The device according to claim 2, wherein, The device includes a plurality of cables arranged around the portion (151) where the cross-section is reduced.

4. The device according to any one of claims 1 to 3, characterized in that The dimensions of the portion (151) where the cross-section is reduced are set such that when the shaft (15) moves in a first direction, a given compressive load is transmitted between the two adjacent portions (153, 154), and the dimensions of the at least one connecting element (155) or the dimensions of the at least one connecting element (155) and the portion (151) where the cross-section is reduced are set such that when the shaft (15) moves in a second direction opposite to the first direction, a given tensile load is transmitted between the two adjacent portions (153, 154), and the compressive load is less than the tensile load.

5. The device according to claim 4, characterized in that, The compressive load is 1% to 50% of the tensile load.

6. The device according to claim 5, wherein The compressive load is 2% to 25% of the tensile load.

7. The device according to any one of claims 1 to 3 and 5 to 6, characterized in that, The two adjacent portions (153, 154) of the shaft (15) are separated from each other.

8. The device according to claim 7, wherein, The device has a layer of thermal insulation material (156) interposed between the two adjacent portions (153, 154).

9. The device according to any one of claims 1 to 3, 5 to 6 and 8, characterized in that, The connecting element (155) is made of at least one of the following materials: Kevlar fiber, glass fiber, epoxy resin with carbon fiber.

10. The device according to any one of claims 1 to 3, 5 to 6 and 8, characterized in that The device is of the type of a single compression stage, and the device includes: a housing that houses a single compression chamber (3); an inlet system (2) that communicates with the compression chamber (3) and is configured to allow a fluid to be compressed to enter the compression chamber (3); a movable piston (5) for ensuring the compression of the fluid in the compression chamber (3), and the device (1) further includes a discharge orifice (7) that is configured to allow the compressed fluid to be discharged from the compression chamber (3).

11. The device according to any one of claims 1 to 3, 5 to 6 and 8, characterized in that The device is of the type of two compression stages, and the device (1) includes: a first compression chamber (3); a second compression chamber (4); an inlet system (2) that communicates with the first compression chamber (3) and is configured to allow a fluid to be compressed to enter the first compression chamber (3); a delivery system (6) that communicates with the first compression chamber (3) and the second compression chamber (4) and is configured to allow the fluid to be delivered from the first compression chamber (3) to the second compression chamber (4); a movable piston (5) for ensuring the compression of the fluid in the first compression chamber (3) and the second compression chamber (4), and the device (1) further includes a discharge orifice (7) that communicates with the second compression chamber (4) and is configured to allow the discharged compressed fluid, and the second compression chamber (4) is defined by a part of the body of the piston (5) and the fixed wall of the device, the inlet system (2) is located at a first end of the device (1), the discharge orifice (7) is located at a second end of the device, and the delivery system (6) is located between the inlet system (2) and the discharge orifice (7).

12. The device according to any one of claims 1 to 3, 5 to 6 and 8, characterized in that, The device is housed in a sealed enclosure (130) containing a cryogenic cooling fluid bath (16).

13. The device according to any one of claims 1 to 3, 5 to 6 and 8, characterized in that, The cross-sectional area of the shaft (15) in the portion (151) where the cross-section is reduced is reduced by 65% to 80% compared to the cross-sectional area of the remainder of the shaft (15).

14. A station for filling a pressurized gas storage tank, the station comprising a source (17) of liquefied gas and an extraction circuit (18) having a first end connected to the source (17) of liquefied gas and at least one second end intended to be connected to a storage tank (19) to be filled, the extraction circuit (18) comprising a device (1) for compressing a cryogenic fluid in at least one compression stage according to any one of claims 1 to 13.

15. The station according to claim 14, characterized in that, The liquefied gas is liquefied hydrogen.

Images