Fluid compression device and filling station

Abstract

The invention relates to a fluid compression device comprising a compression chamber, a suction system in communication with the compression chamber, a piston comprising an axial body translationally movable in a longitudinal direction to compress fluid in the compression chamber, the piston being movable relative to a stationary structure of the device, the device comprises a discharge orifice communicating with the compression chamber and designed to discharge compressed fluid, the body of the piston comprising a tubular portion mounted around a stationary central guide connected to a stationary structure, the device comprising a sealing system formed between the central guide and the tubular portion of the piston, the compression chamber is delimited by a tubular portion of the piston and an end of a central guide connected to the stationary structure via a support member received in a longitudinal opening formed in the body of the piston and enabling relative longitudinal sliding of the piston around the support member. The invention also relates to a station for filling a tank or a line with pressurized gas.

Description

Technical Field

[0001] The invention relates to a fluid compression device and a filling station.

[0002] More specifically, the present invention relates to a fluid compression device, in particular a fluid compression device for cryogenic fluids, the fluid compression device comprising a compression chamber, a suction system connected to the compression chamber, a piston, the piston comprising an axial body capable of translating in a longitudinal direction to compress the fluid in the compression chamber, the piston being movable relative to a stationary structure of the device, the device comprising a discharge orifice connected to the compression chamber and designed to discharge the compressed fluid, the body of the piston comprising a tubular portion mounted around a stationary central guide connected to the stationary structure, the device comprising a sealing system formed between the central guide and the tubular portion of the piston, the compression chamber being defined by the tubular portion of the piston and the end of the central guide. Background Art

[0003] Known cryogenic pumps are relatively complex in construction and / or require a relatively large number of components and / or may result in premature wear of components.

[0004] In particular, the relative arrangement of the movable part (piston) and the stationary part (stationary structure) requires complex assembly. Known solutions use a plate forming a support for the piston. This plate is traversed by one or more shafts to transmit the force from the actuator (motor, which is usually in the upper part) to the sleeve or piston (usually in the lower part).

[0005] Document FR 3 107 573 A1 describes an exemplary pumping device of the prior art. Summary of the invention

[0006] It is an object of the present invention to alleviate some or all of the above-mentioned disadvantages of the prior art.

[0007] To this end, the essential feature of the device according to the invention, which is also described in the general definition given above in the preamble, is that the central guide is connected to the stationary structure via a bearing part received in a longitudinal opening formed in the body of the piston, so that the piston can slide longitudinally relative to the bearing part.

[0008] This arrangement is relatively simple and ensures very good alignment of the components. This increases the service life of the wearing parts (seals, wiper seals, guide rings).

[0009] This arrangement enables simple, reliable and reproducible assembly of all components.

[0010] In addition, embodiments of the present invention may have one or more of the following features:

[0011] - during the translational movement of the piston, the body of the piston slides around the support member without passing through the support member;

[0012] - the longitudinal opening of the piston is delimited by a forked portion of the body of the piston having a plurality of branches, the longitudinal opening being formed by the gaps between the branches;

[0013] - a support member extends transversely to the longitudinal direction between two lateral ends protruding beyond the body of the piston, each of the two lateral ends of the support member being connected to the structure;

[0014] - the central guide is rigidly connected to the support part by at least one of the following means: a threaded connection, a fitting connection and an elastically deformable connection, the support part being rigidly connected to the stationary structure, for example by a butting, a fitting, a clamping or a threaded connection;

[0015] - the support part is held longitudinally stationary in the structure between two longitudinal retaining stops located on both sides of the support part in the longitudinal direction;

[0016] - the structure comprises two tubular housing parts connected to each other longitudinally around the piston;

[0017] - at least one of the two tubular housing parts is formed with a longitudinal retaining stop at one longitudinal end of the support member;

[0018] - the device comprises a spacer mounted around the body of the piston, the spacer being arranged between the body of the piston and at least one of the two tubular housing parts, the spacer being formed with a longitudinal retaining stop at one longitudinal end of the support member;

[0019] - the support element is held stationary transversely to the longitudinal direction by a transverse retaining stop formed by the structure;

[0020] - said discharge orifice is located at the end / terminal end of said central guide, the device comprising a discharge circuit for compressed fluid comprising a first end connected to said discharge orifice and a second end opposite to said first end in said longitudinal direction, said discharge circuit for compressed gas passing through the body of said central guide and said support member;

[0021] - the body of the piston is made of a plurality of parts connected to each other in a detachable manner in the longitudinal direction;

[0022] - the tubular portion and the fork-shaped portion of the body of the piston are detachably connected to each other in the longitudinal direction, for example by a threaded connection;

[0023] - the device is a two-stage compression device and comprises a pre-compression chamber, a pre-suction system in communication with the pre-compression chamber, the pre-suction system being designed to allow fluid to enter the pre-compression chamber, the suction system in communication with the pre-compression chamber to enable compressed fluid in the pre-compression chamber to be transferred to the compression chamber for additional compression;

[0024] - the device comprises a fluid-tight housing connected to the structure, the housing being designed to contain a bath of a cryogenic fluid comprising a liquid phase and an expansion space, the compression chamber being located in the housing and immersed in the bath;

[0025] - in the longitudinal direction of the translational movement of the piston, the pre-suction system is located at a first end of the device, preferably at the lower end, and the discharge orifice is located at a second end of the device, preferably at the upper end, the pre-suction system comprising one or more ports which enable or prevent communication between the pre-compression chamber and the external bath depending on the longitudinal position of the piston;

[0026] the one or more ports are arranged so as to enable communication between the pre-compression chamber and the external bath when the piston moves beyond / above the ports, i.e. when the position of the piston is beyond / above at least a portion of the one or more ports, the one or more ports being designed to allow any gas in the pre-compression chamber to escape to the external bath via the one or more ports during the suction phase, i.e. when the volume of the pre-compression chamber is gradually increasing, so as to be replaced by liquid, the one or more ports being designed to allow excess liquid to be discharged and to meter the amount of liquid trapped in the pre-compression chamber to a determined value before it ceases to communicate with the first pre-compression chamber during the compression phase, i.e. when the piston is gradually reducing the volume of the pre-compression chamber;

[0027] The suction system comprises at least one of: one or more non-return valves, at least one flat disk valve or a plurality of valves designed to allow the fluid to be compressed to enter the compression chamber (pre-compression chamber) during the suction phase and to prevent the fluid from flowing out during the compression phase.

[0028] The invention also relates to a station for filling tanks or pipelines of pressurized gas, the station comprising: a source of liquefied gas, in particular liquefied hydrogen, an extraction circuit having a first end connected to said source and at least one second end intended to be connected to a tank to be filled, the extraction circuit comprising a pumping device or a fluid compression device according to any of the above or following characteristics.

[0029] The invention may also relate to any alternative device or method comprising any combination of the above or below features falling within the scope of the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Further specific features and advantages will become apparent from a reading of the following description provided with reference to the accompanying drawings, in which:

[0031] BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The invention will be better understood by reading the following description, which is given by way of example only and with reference to the accompanying drawings, in which:

[0033] Figure 1 is a schematic partial vertical sectional view taken in a first section of a fluid compression device according to a first embodiment;

[0034] Figure 2 is perpendicular to Figure 1 A schematic partial vertical cross-sectional view taken at a second section of a first section of a fluid compression device in FIG.

[0035] Figure 3 It is in disassembled state Figure 1 A schematic partial perspective view of a fluid compression device in FIG.

[0036] Figure 4 is a schematic partial vertical sectional view taken in a first section of a detail of a partially disassembled fluid compression apparatus;

[0037] Figure 5 is a schematic partial vertical cross-sectional view taken in a second section of a detail of a partially disassembled fluid compression apparatus;

[0038] Figure 6 is a schematic partial vertical sectional view taken in a first section of a fluid compression device according to a second embodiment;

[0039] Figure 7 is a partial schematic diagram of an example tank filling station.

[0040] The same reference numerals refer to the same elements throughout the drawings. DETAILED DESCRIPTION

[0041] In this detailed description, the following embodiments are examples. Although the description relates to one or more embodiments, this does not mean that these features only apply to a single embodiment. The various features of different embodiments may also be combined and / or interchanged to provide other embodiments.

[0042] Figure 6 The fluid compression device 1 shown in is an exemplary embodiment with one compression stage. The compression device 1 is, for example, a pump for pumping a cryogenic fluid, such as liquid hydrogen, preferably at high pressure (typically several hundred bar).

[0043] The compression device 1 comprises a compression chamber 4 , a suction system 6 communicating with the compression chamber 4 , and a piston 5 , the piston 5 comprising an axial body movable in translation along a longitudinal direction A, one end of which compresses the fluid in the compression chamber 4 .

[0044] The device 1 has a stationary structure 24, 25 carrying most of the stationary and movable parts and in particular a fluid-tight housing 13 connected to the structure 24, 25 and designed to contain a cryogenic fluid bath 16 comprising a liquid phase and an expansion space. The compression chamber 4 is located in the housing 13 so that it can be immersed in the bath 16.

[0045] As shown, the structure may comprise two tubular housing parts 24, 25 (or sleeves) which are connected to each other longitudinally around the piston 5 in a gas-tight and sealed manner, for example by a screw connection.

[0046] The piston 5 is movable in translation in the structure in a reciprocating manner along the longitudinal direction A. The piston 5 is moved, for example, by an actuator 21, optionally a motor associated with a motion conversion system. The actuator 21 is preferably located at the top of the device 1, for example mounted on the structure.

[0047] Any type of actuator 21 may be used: linear actuators such as hydraulic and electromechanical cylinders, ball screws, roller screws, or the rotary slider crank motion conversion system itself driven by a gear motor, motor and belt, or direct drive motor.

[0048] The compression device 1 comprises a discharge orifice 7 communicating with the compression chamber 4 and designed to enable the compressed fluid to be discharged. The body of the piston 5 comprises a tubular portion 15 mounted around a stationary central guide 8. The central guide 8, for example cylindrical, is connected to structures 24,25.

[0049] A sealing system 10 is provided between the central guide 8 and the tubular portion 15 of the piston 5. The sealing system comprises a set of gaskets, for example a set of O-rings, and may be associated with one or more guide rings guiding the tubular portion 15 relative to the central guide.

[0050] The compression chamber 4 is thus delimited by the tubular portion 15 of the piston 5 and the terminal end of the central guide 8 .

[0051] As shown, the entire compression chamber 4 may be contained within the tubular portion of the piston 5 .

[0052] As shown, when in the use position, the piston 5 is preferably vertical, with the suction system 6, the discharge orifice 7, the compressed fluid outlet and the actuator positioned in sequence from bottom to top.

[0053] The discharge orifice 7 is preferably located at the lower end of the central guide 8. The device 1 comprises a discharge circuit 11 for compressed fluid, comprising a first end connected to the discharge orifice 7 and a second end located opposite to the first end of the device 1. This discharge circuit 11 for compressed gas preferably passes through the interior of the body of the central guide 8 and through the support member 9 via a suitable channel.

[0054] In this non-limiting example embodiment, the fluid in the compression chamber 4 is compressed by the upward stroke (traction force) of the piston 5 .

[0055] As schematically shown, the central guide 8 is connected to the stationary structure 24 , 25 via a bearing member 9 which is received in a longitudinal opening 50 formed in the body of the piston 5 , 15 and enables the piston 5 to slide longitudinally relative thereto while surrounding / enclosing the bearing member 9 .

[0056] During the translational movement of the piston 5 , the body of the piston 5 slides around / encompasses the support member 9 , preferably without passing through the support member 9 .

[0057] This is also Figure 1 , Figure 2 and Figure 3 , which show another embodiment with two compression stages. Figure 1 , Figure 2 and Figure 3 The examples in Figure 6 The embodiment in FIG. 1 differs only in that it has two compression stages. Identical elements are denoted by the same reference numerals and are not described again. The embodiment with two compression stages comprises a pre-compression chamber 3 and a pre-inhalation system 2 connected to the pre-compression chamber 3, which is designed to allow the fluid in the bath 16 to enter the pre-compression chamber 3.

[0058] In this configuration, the pre-compression chamber 3 is delimited at its lower end, for example, by a lower flange 12 (or gate / flap) which transversely closes the tubular portion at its lower end. This flange 12 may include the pre-inhalation system 2 (one or more suitable valves). This lower flange 12 may also include an overflow valve designed to limit the pressure increase in the pre-compression chamber 3. This lower flange 12 may optionally be used to center the cold end (here all the mechanical parts of the assembly) relative to the housing 13. This can ensure alignment between the housing 13 and the cold end of the pre-compression chamber (and limit any vibrations) by means of a member for holding the cold end relative to the housing 13.

[0059] The suction system 6 of the compression chamber 4 is in communication with the pre-compression chamber 3 so that the compressed fluid in the pre-compression chamber 3 (first compression stage) can be transferred to the compression chamber 4 for additional compression (second compression stage).

[0060] In this example, a first compression stage is performed by a downward stroke of the piston 5 (piston compression), while a second compression stage is performed by an upward stroke of the piston 5 (traction increase), and so on.

[0061] Therefore, the lower end of the piston 5 is formed as a movable surface for compressing the fluid in the pre-compression chamber 3, and the tubular part of the piston 5 is formed as a movable sleeve, which cooperates with the end of the central guide 8 to form a system for compressing the fluid in the compression chamber 4, wherein the end of the central guide 8 is formed as a stationary piston.

[0062] Thus, the longitudinal direction A of the translation of the piston 5 is preferably vertical, the pre-inhalation system 2 being located at a first, lower end of the device 1 and the discharge orifice 7 being located at a second, upper end of the device 1 .

[0063] Preferably, the fluid pre-intake system in the pre-compression chamber includes one or more ports or slots (for simplicity, the ports are not shown) formed in the top of the wall defining the pre-compression chamber, which ports or slots enable or prevent communication between the pre-compression chamber 3 and the external bath 16 depending on the longitudinal position of the piston 5.

[0064] The one or more ports may be arranged longitudinally so as to enable communication between the pre-compression chamber 3 and the external bath 16 when the piston 5 moves beyond the ports, i.e. when the position of the piston 5 is beyond / above at least a portion of the one or more ports. The one or more ports are designed to allow any gas in the pre-compression chamber 3 to escape to the external bath 16 via the one or more ports during the suction phase, i.e. when the volume of the pre-compression chamber 3 is gradually increased, so as to be replaced by liquid. The one or more ports are designed to allow excess liquid to be discharged and the amount of liquid trapped in the pre-compression chamber 3 to be metered to a determined value before it stops communicating with the first pre-compression chamber 3 during the compression phase, i.e. when the piston 5 gradually reduces the volume of the pre-compression chamber 3.

[0065] The pre-inhalation system 2 and the intake system 6 may comprise at least one of the following: one or more check valves, at least one flat disc valve or a plurality of valves designed to allow the fluid to be compressed to enter the relevant chamber (compression chamber / pre-compression chamber) during the intake phase and to prevent the fluid from flowing out during the compression phase.

[0066] Especially Figure 2 As shown, the longitudinal opening 50 of the piston 5 accommodating the support member 9 may be delimited by a fork-shaped portion of the body of the piston 5 having two branches 125. Thus, the longitudinal opening 50 may be formed by the gaps between the parallel branches 125.

[0067] The support member 9 may then extend between two lateral ends protruding beyond the body of the piston 5 transversely to the longitudinal direction A. Each of the two lateral ends of the support member 9 may be connected or fastened to a structure 24 , 25 on both sides of the body of the piston 5 .

[0068] The support part 9 can be held longitudinally stationary in the structure 24, 25 between two longitudinal holding stops 123, 124 located on both sides of the support part 9 in the longitudinal direction A. For example, two tubular parts 24, 25 (or sleeves) are connected to each other longitudinally around the piston 5. This optimizes the force transmission between the parts 8, 9, 24, 25.

[0069] One of the tubular housing parts (eg, the lower part 24 ) may be formed with a longitudinal retaining stop 124 which receives a longitudinal end (eg, a lower end) of the support member 9 .

[0070] As shown, a spacer 23 (e.g. a tubular spacer) can be mounted around the body of the piston 5 between the body of the piston 5 and one of the two tubular housing parts 24, 25 (e.g. in the lower tubular part 24). The upper end of the spacer 23 abuts, for example, a shoulder formed by the upper tubular part 25. The lower end of the spacer 23 abuts, for example, an upper part of the support member 9. The support member 9 is thus longitudinally blocked between the spacer 23 and the lower tubular part 24 by the structures 24, 25.

[0071] The spacer 23 is thus located above the support element 9 and is able to hold the support element 9 and, moreover, to provide a reaction force to keep the central guide 8 stationary.

[0072] The force is thus transmitted to the upper housing part 25. The spacer 23 also ensures a central alignment between the upper housing part 25 and the lower housing part 24.

[0073] In the example shown, the spacer 23 is tubular. Naturally, the spacer may have any other geometric shape, such as an overall annular shape, for example between the support member and one or the other of the housing parts 24, 25.

[0074] Likewise, the spacer 23 can be removed. In this case, the top of the support member 9 can be longitudinally blocked by the tubular housing portion 24, for example.

[0075] The support member 9 is blocked transversely to the longitudinal direction A, for example by a tubular housing portion 24 of the structure surrounding it.

[0076] Thus, the support part 9 can be rigidly connected to the stationary structure 24, 25, although eg mounting, clamping and screwing are possible.

[0077] As described in detail below, the central guide 8 may be rigidly connected to the support member 9 by at least one of the following means: threaded connection, fitting, and elastic deformation.

[0078] like Figure 3 and Figure 4 and Figure 5 As shown, the body of the piston 5 may be made of a plurality of parts which are longitudinally connected to each other in a detachable manner, for example by threading.

[0079] For example, the lower tubular portion 15 and the forked upper portion of the main body of the piston 5 are connected to each other longitudinally in a detachable manner, for example, by a threaded connection. Similarly, the connection between the forked portion and the upper integral portion can be connected in a detachable manner.

[0080] This structure requires relatively few parts and ensures reliable operation while being easy to assemble and disassemble.

[0081] Reference below Figure 3 An example assembly describing the major components.

[0082] In a first step, the support element 9 can be inserted transversely into the longitudinal opening 50 of the piston 5 .

[0083] The support member 9 may be provided with a sliding plate (eg a copper plate with a PTFE coating) mounted on its outer surface and have sufficient play relative to the longitudinal opening 50 to ensure relative sliding between the two members 125 and 9 .

[0084] This structure enables good alignment of the components in the longitudinal direction, which ensures and guarantees good sealing and good durability of the seal 10 .

[0085] The bearing member 9 is preferably also mounted with play in the lower housing part 24 to ensure optimal alignment between the two longitudinal ends of the piston 5 during assembly.

[0086] The upper end of the central guide 8 can be rigidly connected to the component 9, for example by a threaded connection, passing through a passage (e.g. a hole) formed at the lower end of the forked portion of the piston 5. Then, the tubular portion 15 forming the lower end of the piston can be mounted around the central guide 8 and fastened to the forked upper portion of the piston 5.

[0087] Naturally, the upper and lower parts of the piston can be fastened in different ways and at different longitudinal points. For example, the two parts of the piston 5 can be separated at the bottom of the tubular part 15 (sleeve), for example by a threaded base. Similarly, the piston 5 can be a single component / integral piece. Similarly, the piston 5 can be made of more than two parts / components that are detachably connected together. For example, the upper end can be made of a plurality of separable parts, and in particular of three parts.

[0088] The assembly with the support member 9 can be located in the lower tubular housing portion 24 of the structure. In this case, the spacer 23 can be mounted around the piston 5.

[0089] The obtained assembly can then be arranged on top of the upper tubular housing part 25 of the structure. The upper end of the piston 5 is inserted into the upper tubular housing part 25 (the top of the structure). The two parts 24, 25 of the structure can be connected to each other, for example by threaded connections, at both ends, for example comprising assembly flanges.

[0090] Alternatively, the spacer 23 may be mounted above the support member 9 and then the upper end of the piston 5 may be inserted into the upper housing part 25 of the structure. The lower housing part 24 may then be joined to the upper housing part 25.

[0091] Alternatively, the assembly does not comprise the spacer 23 .

[0092] The top of the piston 5 is preferably guided in the upper housing part 25 forming the sleeve. This guidance can be provided by one or more inserted guide rings in contact with the piston 5. The guide rings can be made of a material with a low coefficient of friction, such as PTFE and bronze or PTFE and carbon.

[0093] The piston 5 can also be guided longitudinally in the lower housing part 24 around the tubular section 15 (optionally also with one or more rings).

[0094] A set of seals / sealing parts (eg, multiple segments) carried on the bottom of the tubular portion of the piston may be used to form a seal with the lower housing portion 24. This set of seals also assists in longitudinal guidance.

[0095] The support member 9 may comprise an outlet 105 for the pressurized fluid coming from the compression chamber 4, which has passed through the central guide 8, the discharge orifice 7 and through the body of the support member 9. A line of the discharge circuit 11 may be connected to this fluid outlet 105 to collect the compressed fluid and convey it to the outlet of the compression device 1.

[0096] like Figure 2As shown, the lower housing part 24 may include a lateral opening to allow the pipeline 11 and in particular its connection end to the support member 9 to pass. This fastening of the pipeline to the fluid outlet 105 can be performed, for example, using a threaded connection, which can be associated with a seal, such as a metal energized seal. Naturally, any other type of conical, NPT or other high-pressure fluid connection can be used.

[0097] The upper housing part 25 is stationary and may be rigidly connected to or be part of the housing 13 containing the cryogenic fluid bath to be pumped. In particular, the top of the stationary structure may include or constitute an upper mounting flange of the housing 13.

[0098] The actuator 21 (motor and related mechanisms, if applicable) of the piston 5 can be mounted on this upper structural part 25. The actuator 21 can be mechanically coupled to the upper end of the piston 5 to move the piston 5 in translation and transmit the forces required for the different suction and compression phases of the fluid.

[0099] During compression (traction) in the compression chamber 4, the main mechanical force generated by the piston 5 (fork-shaped part and tubular part delimiting the compression chamber) is absorbed by the piston end forming the compression chamber. This force is transmitted to the support part 9 and then to the spacer 23 and the upper part 25 of the structure.

[0100] The above-described arrangement and its assembly / disassembly enable the components of the mechanism to be guided and aligned.

[0101] The number of parts is limited and assembly / disassembly is simple.

[0102] The absorption of forces, especially traction forces, is optimized. This helps to extend the service life of the various seals.

[0103] Of course, the present invention is not limited to the above examples. For example, the spacer 23 may be a part of the upper housing portion 25 (an integral piece / single piece or other).

[0104] Similarly, the support member 9 and at least a portion of the central guide 8 may be a one-piece component, as long as the resulting component is insertable through the longitudinal opening 50 .

[0105] This type of compression device 1 (or a plurality of them connected in series or in parallel) can be used in any cryogenic system in which it is necessary to pump or compress a cryogenic fluid. For example, a station for filling a pressurized gas (e.g. hydrogen) tank may comprise a liquefied gas source 17, an extraction circuit 18 having a first end connected to the source and at least one second end intended to be connected to a tank 190 to be filled, the extraction circuit 18 comprising such a pumping device 1. The pumped fluid may be vaporized in a downstream exchanger 19 and optionally stored in one or more pressurized buffer tanks 20.

Claims

1. A fluid compression device (1), in particular a fluid compression device for cryogenic fluids, comprising a compression chamber (4), an intake system (6) connected to the compression chamber (4), a piston (5, 15), the piston comprising an axial body capable of translational movement in a longitudinal direction (A) to compress the fluid in the compression chamber (4), the piston (5) being movable relative to a stationary structure (24, 25) of the device (1), the device (1) comprising a discharge orifice (7) connected to the compression chamber (4) and designed to discharge the compressed fluid, the body of the piston (5) comprising a central stationary portion connected to the stationary structure (24, 25) and a central portion connected to the stationary structure (24, 25) The device (1) comprises a sealing system (10) formed between the central guide (8) and the tubular portion (15) of the piston (5), the compression chamber (4) being delimited by the tubular portion (15) of the piston (5) and the end of the central guide (8), the central guide (8) being connected to the stationary structure (24, 25) via a support member (9) and enabling the piston (5) to slide longitudinally relative to the support member (9), the support member being received in a longitudinal opening (50) formed in the body of the piston (5, 15), characterized in that During the translational movement of the piston (5), the body of the piston (5) slides around the support member (9) without passing through the support member (9).

2. The device (1) according to claim 1, characterized in that The longitudinal opening (50) of the piston (5, 15) is delimited by a fork-shaped portion of the body of the piston (5) having a plurality of branches (125), the longitudinal opening (50) being formed by the gaps between the branches (125).

3. The device (1) according to claim 1 or 2, characterized in that The support member (9) extends transversely to the longitudinal direction (A) between two lateral ends protruding beyond the body of the piston (5), each of the two lateral ends of the support member (9) being connected to the structure (24, 25).

4. The device (1) according to any one of claims 1 to 3, characterized in that The central guide (8) is rigidly connected to the support component (9) by at least one of the following means: a threaded connection, a fitting connection and an elastic deformation connection, and the support component (9) is rigidly connected to the stationary structure (24, 25), for example, the support component is rigidly connected to the stationary structure by a butt connection, a fitting connection, a clamping connection or a threaded connection.

5. The device (1) according to any one of claims 1 to 4, characterized in that The support part (9) is held longitudinally stationary in the structure (24, 25) between two longitudinal retaining stops (123, 124) located on both sides of the support part (9) in the longitudinal direction (A).

6. The device (1) according to any one of claims 1 to 5, characterized in that The structure comprises two tubular housing parts (24, 25) connected to each other in the longitudinal direction around the piston (5).

7. The device (1) according to claims 5 and 6, characterized in that At least one of the two tubular housing parts (24, 25) is formed with a longitudinal retaining stop at one longitudinal end of the support member (9).

8. The device (1) according to claim 6 or 7, characterized in that The device comprises a spacer (23) mounted around the body of the piston (5), the spacer (23) being arranged between the body of the piston (5) and at least one of the two tubular housing parts (24, 25), the spacer (23) being formed with a longitudinal retaining stop at one longitudinal end of the support member (9).

9. The device (1) according to any one of claims 1 to 8, characterized in that The support element (9) is held stationary transversely to the longitudinal direction (A) by a transverse retaining stop (24) formed by the structures (24, 25).

10. The device (1) according to any one of claims 1 to 9, characterized in that The discharge orifice (7) is located at the end of the central guide (8), the device (1) comprises a discharge circuit (11) for compressed fluid, the discharge circuit comprising a first end connected to the discharge orifice (7) and a second end opposite to the first end in the longitudinal direction (A), the discharge circuit (11) for compressed gas passing through the body of the central guide (8) and the support member (9).

11. The device (1) according to any one of claims 1 to 10, characterized in that The main body of the piston (5) is made of a plurality of parts which are detachably connected to each other in the longitudinal direction.

12. The device (1) according to claims 2 and 11, characterized in that The tubular portion (15) and the fork-shaped portion of the main body of the piston (5) are detachably connected to each other in the longitudinal direction, for example, by a threaded connection.

13. The device (1) according to any one of claims 1 to 12, characterized in that The device is a two-stage compression device and comprises a pre-compression chamber (3), a pre-suction system (2) connected to the pre-compression chamber (3), the pre-suction system (2) being designed to allow fluid to enter the pre-compression chamber (3), and the suction system (6) being connected to the pre-compression chamber (3) so that the compressed fluid in the pre-compression chamber (3) can be transferred to the compression chamber (4) for additional compression.

14. The device (1) according to any one of claims 1 to 13, characterized in that The device comprises a fluid-tight housing (13) connected to the structure (24, 25), the housing being designed to contain a bath (16) of a cryogenic fluid in liquid phase and an expansion space, the compression chamber (4) being located in the housing (13) and immersed in the bath (16).

15. A station for filling a tank or pipeline with pressurized gas, the station comprising: A source (17) of liquefied gas, in particular liquefied hydrogen, an extraction circuit (18) having a first end connected to the source and at least one second end intended to be connected to a tank (190) to be filled, the extraction circuit (18) comprising a pumping device (1) or a fluid compression device (1) according to any one of claims 1 to 14.

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