Fluid compression apparatus and filling station

Abstract

To provide a fluid compression apparatus tha is relatively simple, ensures very good alignment of parts, and improves the service life of wearing parts.SOLUTION: A fluid compression apparatus comprises a compression chamber (4), an intake system (6), a piston (5) capable of translational motion in a longitudinal direction (a) within the compression chamber (4) relative to a static structure (24, 25), and a discharge orifice (7) that is in communication with the compression chamber (4) and through which compressed fluid egresses. The piston (5) comprises a tubular portion (15) that is mounted about a static central guide (8) connected to the static structure (24, 25). The compression chamber (4) is delimited by the tubular portion (15) of the piston (5) and a terminal end of the central guide (8). The central guide (8) is connected to the static structure (24, 25) via a support part (9) of a longitudinal opening (50) that is formed in the body of the piston (5), and enables relative longitudinal sliding of the piston (5) about the support part (9).SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] The present invention relates more specifically to a fluid compression device, in particular for cryogenic fluids, comprising a compression chamber, an intake system in communication with the compression chamber, and a piston with a shaft capable of longitudinal translation to compress the fluid in the compression chamber, the piston being movable relative to a stationary structure of the device, the device comprising an outlet orifice in communication with the compression chamber and designed to allow the compressed fluid to exit, 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 terminal end of the tubular portion of the piston and the central guide. [Background technology]

[0003] Known cryogenic pump architectures may be relatively complex and / or require a relatively large number of parts and / or result in premature wear of the parts.

[0004] In particular, the relative positioning of the moving part (piston) and the stationary part (stationary structure) requires complex assembly. A known solution uses a plate that forms a support for the piston, across which one or more shafts transmit the force from the actuator (motor) (usually in the upper part) to the sleeve or piston (usually in the lower part).

[0005] Document FR3107573A1 describes an exemplary pumping device from the prior art. Summary of the Invention

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

[0007] For this purpose, the device according to the invention is essentially characterised in that the central guide is connected to the stationary structure via a support received in a longitudinal opening formed in the body of the piston, allowing relative longitudinal sliding of the piston around the support, as otherwise described in the general provisions given in the preamble above.

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

[0009] This arrangement allows for easy, reliable and reproducible assembly of all parts.

[0010] Further, an embodiment of the present invention comprises: - during the translational movement of the piston, the body of the piston slides around the support without passing through it, - the longitudinal opening of the piston is defined by a fork-shaped portion of the body of the piston having several branches, the longitudinal opening being formed by the spacing between the branches, - the support extends transversely to the longitudinal direction between two lateral ends that protrude beyond the body of the piston, each of the two lateral ends of the support being connected to a structure; - the central guide is rigidly connected to the support by at least one of screwing, interlocking and elastic deformation, and the support is rigidly connected to the stationary structure, for example by butting, interlocking, clamping or screwing; - the support is held stationary longitudinally within the structure between two longitudinal retention stops located on either side of the support in the longitudinal direction; - the structure comprises two tubular housing parts joined longitudinally to each other around the piston, - at least one of the two tubular housing parts forms a longitudinal retention stop at one longitudinal end of the support, - 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 forming a longitudinal retention stop at one longitudinal end of the support; - the support is held stationary transversely to the longitudinal direction by lateral retention stops formed by the structure, - the discharge orifice is located at the end of the central guide, the device comprises a discharge circuit for compressed fluid having a first end connected to the discharge orifice and a second end located opposite the first end in the longitudinal direction, and a discharge circuit for compressed gas passes through the body and the support of the central guide, - the body of the piston is made from several parts joined together longitudinally in a disassemblable manner, - the tubular part and the fork-shaped part of the body of the piston are longitudinally joined to one another in a disassemblable manner, for example by screwing, - the apparatus is a two-stage compression apparatus, comprising a pre-compression chamber, a pre-intake system in communication with the pre-compression chamber designed to allow fluid to enter the pre-compression chamber, the intake system in communication with the pre-compression chamber to allow compressed fluid in the pre-compression chamber to be transferred to the compression chamber for further compression, - the device comprises a fluid-tight housing connected to the structure and designed to contain a reservoir of cryogenic fluid including an expansion space and a liquid phase, the compression chamber being located within the housing so as to be immersed in the reservoir; - 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 allow or prevent communication between the pre-compression chamber and the external reservoir depending on the longitudinal position of the piston, - the one or more ports are arranged to allow communication between the pre-compression chamber and the external reservoir when the piston moves past said port, i.e. when the piston is located at least partially past the one or more ports, and during the suction phase, when the volume of the pre-compression chamber is increasing, the one or more ports are designed to allow any gas in the pre-compression chamber to escape through the one or more ports to the external reservoir and to replace it with liquid, and during the compression phase, when the piston is decreasing the volume of the pre-compression chamber, the one or more ports are designed to allow excess liquid to escape and to meter the volume of liquid stored in the pre-compression chamber up to a determined value before terminating communication with the first pre-compression chamber, The intake system may have one or more of the following characteristics: it comprises at least one of one or more check valves, at least one flat disc valve, designed to allow the fluid to be compressed to enter the compression chamber (pre-compression chamber) during the intake phase and to prevent the fluid from leaving during the compression phase.

[0011] The invention also relates to a station for filling tanks or lines of pressurized gas, comprising a source of liquefied gas, in particular liquefied hydrogen, and a withdrawal circuit having a first end connected to the source and at least one second end intended to be connected to the tank to be filled, the withdrawal circuit comprising a pumping device or a fluid compression device according to any one of the above or below characteristics.

[0012] The invention may also relate to any alternative device or method comprising any combination of the above-mentioned or below-mentioned features falling within the scope of the claims. Further particular features and advantages will become apparent upon reading the following description, provided with reference to the drawings.

[0013] The invention will be better understood on reading the following description, given purely by way of example with reference to the accompanying drawings, in which: [Brief description of the drawings]

[0014] [Figure 1]1 is a schematic partial vertical cross-sectional view of a fluid compressing device according to a first embodiment, as viewed from a first cross-sectional plane. [Diagram 2] 2 is a schematic partial longitudinal cross-sectional view of the fluid compressing device of FIG. 1, taken from a second cross-sectional plane perpendicular to the first cross-sectional plane. [Diagram 3] 2 is a schematic, partially perspective view of the fluid compression device of FIG. 1 in an exploded state; [Figure 4] FIG. 2 is a schematic partial longitudinal cross-sectional view from a first cross-sectional plane of a detail of a partially exploded fluid compression device. [Diagram 5] FIG. 2 is a schematic partial longitudinal cross-sectional view from a second cross-sectional plane of a detail of a partially exploded fluid compression device. [Figure 6] 6 is a schematic partial vertical cross-sectional view of a fluid compressing device according to a second embodiment, as viewed from a first cross-sectional plane. FIG. [Figure 7] FIG. 2 is a partial schematic diagram of an exemplary tank filling station. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Like numbers refer to like elements throughout the drawings.

[0016] In this detailed description, the following embodiments are examples. Although the description refers to one or more embodiments, this does not mean that the features apply only to a single embodiment. Individual features of different embodiments may be combined and / or substituted to provide other embodiments.

[0017] The fluid compression device 1 illustrated in Fig. 6 is an exemplary embodiment having one compression stage, for example a pump for pumping a cryogenic fluid, for example liquid hydrogen, preferably at high pressure (typically several hundred bar).

[0018] The compression device 1 comprises a compression chamber 4, a suction system 6 communicating with the compression chamber 4, and a piston 5 having a shaft translatable in a longitudinal direction A, one end of the piston 5 compressing the fluid in the compression chamber 4.

[0019] The device 1 comprises a stationary structure 24, 25 carrying the majority of the stationary and moving parts, and a fluid-tight housing 13 connected to the structures 24, 25 and designed in particular to contain an expansion space and a bath 16 of cryogenic fluid containing a liquid phase. The compression chamber 4 is placed in the housing 13 so as to be immersed in the bath 16.

[0020] As illustrated, the structure may comprise two tubular housing parts 24, 25 (or sleeves) gas-tightly joined to one another longitudinally around the piston 5, for example by screwing.

[0021] The pistons 5 are translatable in an alternating motion in a longitudinal direction A within the structure. The pistons 5 are moved, for example, by an actuator 21 (a motor, optionally associated with a motion conversion system). The actuator 21 is preferably located at the top of the device 1, for example attached to the structure.

[0022] Any type of actuator 21 may be used, for example, hydraulic cylinders, electromechanical cylinders, ball screws, roller screws, or linear actuators such as rotary slider crank motion conversion systems that are themselves driven by gear motors, motors and belts, or direct drive motors.

[0023] The compression device 1 comprises an outlet orifice 7, communicating with the compression chamber 4, designed to allow the compressed fluid to exit. The body of the piston 5 comprises a tubular portion 15 mounted around a stationary central guide 8. The central guide 8, which is for example cylindrical, is connected to structures 24, 25.

[0024] Between the central guide 8 and the tubular portion 15 of the piston 5 a sealing system 10 is provided. This sealing system may comprise a set of gaskets, for example a set of O-rings, associated with one or more guide rings which guide the tubular portion 15 relative to the central guide.

[0025] The compression chamber 4 is thus defined by the tubular portion 15 of the piston 5 and the terminal end of the central guide 8 .

[0026] As illustrated, the entire compression chamber 4 may be housed within a tubular portion of the piston 5 .

[0027] As illustrated, when in the use position, the piston 5 is preferably vertical, with the suction system 6, discharge orifice 7, compressed fluid outlet and actuator positioned from bottom to top, in that order.

[0028] 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, which has a first end connected to the discharge orifice 7 and a second end located opposite the first end of the device 1. This discharge circuit 11 for compressed gas preferably passes inside the body of the central guide 8 and through the support 9 via suitable channels.

[0029] In this non-limiting exemplary embodiment, the fluid in the compression chamber 4 is compressed by the upstroke (traction force) of the piston 5 .

[0030] As shown diagrammatically, the central guide 8 is connected to the stationary structures 24, 25 via supports 9 received in longitudinal openings 50 formed in the bodies of the pistons 5, 15, allowing relative longitudinal sliding of the pistons 5 around the supports 9.

[0031] During the translational movement of the piston 5 , the body of the piston 5 slides around the support 9 , preferably without passing through it.

[0032] This is also illustrated in figures 1, 2 and 3 which illustrate another embodiment having two compression stages. The embodiment of figures 1, 2 and 3 differs from the embodiment of figure 6 only in that it has two compression stages. The same elements are indicated by the same reference numbers and will not be described a second time. The embodiment with two compression stages comprises a pre-compression chamber 3 and a pre-suction system 2 communicating with the pre-compression chamber 3 and designed to allow the fluid in the tank 16 to enter the pre-compression chamber 3.

[0033] In this configuration, the pre-compression chamber 3 is defined at its lower end by, for example, a lower flange 12 (or shutter) that laterally closes the tubular part at its lower end. This flange 12 may contain the pre-suction system 2 (suitable valve or valves). This lower flange 12 may also contain an overflow valve designed to limit the pressure build-up in the pre-compression chamber 3. This lower flange 12 may optionally be used to center the cold end (all of the mechanical parts assembled here) relative to the housing 13. This may be done to ensure alignment of the housing 13 and the cold end of the pre-compression chamber (and to limit any vibrations) via a member for holding the cold end relative to the housing 13.

[0034] The intake system 6 of the compression chamber 4 communicates with the pre-compression chamber 3, allowing compressed fluid in the pre-compression chamber 3 (first compression stage) to be transferred to the compression chamber 4 for further compression (second compression stage).

[0035] The first compression stage is in this example performed by the downward stroke of the piston 5 (piston compression), the second compression stage is performed by the upward stroke of the piston 5 (traction increase), and so on.

[0036] Thus, the lower end of the piston 5 forms a moving surface for compressing the fluid in the pre-compression chamber 3, while the tubular part of the piston 5 forms a moving sleeve which cooperates with the terminal end of the central guide 8 to form a system for compressing the fluid in the compression chamber 4, the terminal end of the central guide 8 forming a stationary piston.

[0037] Thus, the longitudinal direction A of translation of the piston 5 is preferably vertical, the pre-suction system 2 is located at a first, lower end of the device 1 and the discharge orifice 7 is located at a second, upper end of the device 1 .

[0038] Preferably, the fluid pre-suction system in the pre-compression chamber comprises one or more ports or slots (ports not shown for simplicity) formed in the upper part of the wall defining the pre-compression chamber, allowing or preventing communication between the pre-compression chamber 3 and the external reservoir 16 depending on the longitudinal position of the piston 5.

[0039] The port or ports may be longitudinally arranged to allow communication between the pre-compression chamber 3 and the external reservoir 16 when the piston 5 moves past said port, i.e. when the piston 5 is located at least partially past the port or ports. During the intake phase, when the volume of the pre-compression chamber 3 is increasing, the port or ports are designed to allow any gas in the pre-compression chamber 3 to escape through the port or ports to the external reservoir 16 and be replaced by liquid. During the compression phase, i.e. when the piston 5 is decreasing the volume of the pre-compression chamber 3, the port or ports are designed to allow excess liquid to escape and meter the volume of liquid accumulated in the pre-compression chamber 3 to a determined value before terminating communication with the first pre-compression chamber 3.

[0040] The pre-intake system 2 and the intake system 6 may comprise one or more check valves, at least one flat disc valve, designed to allow the fluid to be compressed to enter the associated chamber (compression / pre-pressure) during the intake phase and to prevent the fluid from leaving during the compression phase.

[0041] 2, the longitudinal opening 50 of the piston 5 that receives the support 9 may be defined by a fork-shaped portion of the body of the piston 5 having two branches 125. The longitudinal opening 50 may thus be formed by the spacing between the parallel branches 125.

[0042] The support 9 may then extend between two lateral ends that protrude beyond the body of the piston 5 transversely to the longitudinal direction A. Each of the two lateral ends of the support 9 may be connected or fixed to structures 24, 25 on either side of the body of the piston 5.

[0043] The support 9 may be held stationary longitudinally in the structure 24, 25 between two longitudinal retention stops 123, 124 located on either side of the support 9 in the longitudinal direction A. For example, the two tubular parts 24, 25 (or sleeves) are joined to each other longitudinally around the piston 5. This optimizes the transmission of forces between the parts 8, 9, 24, 25.

[0044] One of the tubular housing portions (eg, lower portion 24 ) may form a longitudinal retention stop 124 that receives a longitudinal end (eg, lower end) of the support 9 .

[0045] As illustrated, a spacer 23, e.g. a tubular spacer, may 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. the lower tubular part 24). The upper end of the spacer 23 abuts, e.g., a shoulder formed by the upper tubular part 25. The lower end of the spacer 23 abuts, e.g., an upper part of the support 9. The support 9 is thus longitudinally blocked by the structures 24, 25 between the spacer 23 and the lower tubular part 24.

[0046] Thus, the spacer 23 is placed above the support 9 and can hold down the support 9 and also provide a reaction force to hold the stationary central guide 8 .

[0047] Thus, the force is transmitted to the upper housing part 25. This spacer 23 also ensures centering between the upper housing part 25 and the lower housing part 24.

[0048] In the illustrated example, the spacer 23 is tubular in shape. Of course, this spacer may have any other geometric shape, for example a general ring shape, for example interposed between the support and one or the other of the housing parts 24, 25.

[0049] Likewise, the spacer 23 may be omitted. In this case, the upper part of the support 9 may be blocked longitudinally, for example, by a portion 24 of the tubular housing.

[0050] The support 9 is blocked transversely to the longitudinal direction A, for example by a tubular housing part 24 of the structure which surrounds it.

[0051] Thus, the support 9 may be rigidly connected to the stationary structures 24, 25, however, for example snap-on, clamped and screwed are all possible.

[0052] As will be described in more detail below, the central guide 8 may be rigidly connected to the support 9 by at least one of screwing, fitting, and elastic deformation.

[0053] As illustrated in figures 3, 4 and 5, the body of the piston 5 can be made of several parts that are joined to one another longitudinally in a disassemblable manner, for example by screwing.

[0054] For example, the lower tubular part 15 and the fork-shaped upper part of the body of the piston 5 are longitudinally joined to one another in a disassemblable manner, for example by screwing. Similarly, the connection between the fork-shaped part and the upper full part can be joined in a separable manner.

[0055] Such an architecture requires relatively few parts and ensures reliable operation while allowing for easy assembly and disassembly.

[0056] One example of assembly of the main components is described below with reference to FIG.

[0057] In a first step, the support 9 can be inserted laterally into the longitudinal opening 50 of the piston 5 .

[0058] This support 9 is mounted with a sliding plate (e.g. a copper plate with a PTFE coating) on ​​its outer surface and may have sufficient play with respect to the longitudinal opening 50 to ensure relative sliding between the two parts 125 and 9.

[0059] The architecture allows for good alignment of the parts in the longitudinal direction, which ensures and guarantees a good seal and good durability of the seal 10.

[0060] The support 9 is also preferably mounted with play in the lower housing part 24 to ensure optimal alignment between the two longitudinal ends of the piston 5 during assembly.

[0061] The upper end of the central guide 8 may be rigidly connected to the part 9, for example by screwing through a passage (e.g. a bore) formed in the lower end of the fork-shaped portion of the piston 5. The tubular part 15 forming the lower end of the piston may then be fitted around the central guide 8 and fixed to the fork-shaped upper part of the piston 5.

[0062] Naturally, the upper and lower parts of the piston may be fixed in different ways and at different longitudinal points. For example, the two parts of the piston 5 may be separable at the bottom of the tubular part 15 (sleeve), for example via a threaded base. Likewise, the piston 5 may be a single part. Likewise, the piston 5 may consist of more than two parts detachably joined together. For example, the upper end may be made of several separable parts, in particular three parts.

[0063] The assembly with this support 9 may be installed in the lower tubular housing part 24 of the structure. In this case, a spacer 23 may be fitted around the piston 5.

[0064] The resulting assembly may then be placed 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 (top of the structure). The two parts 24, 25 of the structure may be joined to each other, for example by screwing, at the two ends which comprise, for example, assembly flanges.

[0065] Alternatively, a spacer 23 may be mounted above the support 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.

[0066] Alternatively, the assembly does not include the spacer 23 .

[0067] The upper part of the piston 5 is preferably guided in an upper housing part 25 forming a sleeve. This guidance may be provided by one or more intervening guide rings in contact with the piston 5. The guide rings may be made of a material with a low coefficient of friction (for example PTFE and bronze, or PTFE and carbon).

[0068] The piston 5 may also be guided longitudinally around the tubular portion 15 in the lower housing part 24 (if necessary also with the aid of one or more rings).

[0069] A seal set (e.g. segments) carried on the bottom of the tubular part of the piston may be used to provide a seal with the lower housing part 24. This seal set may also contribute to longitudinal guidance.

[0070] The support 9 may include an outlet 105 for the pressurized fluid coming from the compression chamber 4, having passed through the body of the support 9, through the central guide 8, the discharge orifice 7. A line of the discharge circuit 11 may be connected to this fluid outlet 105 in order to collect and convey the compressed fluid to the outlet of the compression device 1.

[0071] 2, the lower housing portion 24 may include a side opening to allow this line 11, and in particular its connection end, to pass to the support 9. The fastening of this line to the fluid outlet 105 may be performed using a threaded connection, which may be associated with a seal, such as a metal energized seal, for example. Of course, any other type of conical, NPT, or other high pressure fluid connection may be used.

[0072] The upper housing portion 25 is stationary and may be rigidly connected to or part of the enclosure 13 which contains the reservoir of cryogenic fluid to be pumped. In particular, the upper portion of this stationary structure may comprise or consist of the upper mounting flange of the enclosure 13.

[0073] The actuator 21 (motor and associated mechanism, if applicable) of the piston 5 may be mounted on this superstructure portion 25. The actuator 21 may be mechanically coupled to the upper end of the piston 5 in order to translate the piston 5 and transmit the forces required for the different intake and compression phases of the fluid.

[0074] The main mechanical force generated by the piston 5 (the tubular and fork-shaped parts defining the compression chamber) during compression (traction) in the compression chamber 4 is absorbed by the ends of the piston which form the compression chamber. This force is transmitted to the support 9, then to the spacer 23 and to the upper part 25 of the structure.

[0075] The above described arrangement and its assembly / disassembly makes it possible to guide and align the parts of the mechanism.

[0076] The number of parts is kept to a minimum, making assembly / disassembly easy.

[0077] The absorption of forces, especially traction forces, is optimized, which helps to increase the service life of the different seals.

[0078] Of course, the invention is not limited to the above examples: for example, the spacer 23 may be part of the upper housing part 25 (integral or otherwise).

[0079] Likewise, the support 9 and at least a portion of the central guide 8 may be an integral part, provided that the resulting part can be inserted into the longitudinal opening 50 .

[0080] This type of compressor 1 (or several compressors in series or parallel) can be used in any cryogenic installation requiring pumping or compression of a cryogenic fluid. For example, a station for filling tanks of pressurized gas (e.g. hydrogen) may comprise a source 17 of liquefied gas and a withdrawal circuit 18 having a first end connected to the source and at least one second end intended to be connected to the tank 190 to be filled, the withdrawal circuit 18 comprising such a pumping device 1. The pumped fluid can 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 for a cryogenic fluid, comprising a compression chamber (4), a suction system (6) communicating with said compression chamber (4), and a piston (5, 15) with a shaft translatable in a longitudinal direction (A) for compressing said cryogenic fluid in said compression chamber (4), said piston (5) being movable relative to a stationary structure (24, 25) of said fluid compression device (1), The fluid compression device (1) comprises an outlet orifice (7) communicating with the compression chamber (4) and designed to allow the compressed fluid to leave, the body of the piston (5) comprising a tubular portion (15) mounted around a stationary central guide (8) connected to the stationary structure (24, 25), The fluid compression device (1) comprises a seal system (10) formed between the stationary central guide (8) and the tubular portion (15) of the piston (5), the compression chamber (4) being defined by the tubular portion (15) of the piston (5) and an end portion of the stationary central guide (8), the stationary central guide (8) being connected to the stationary structure (24, 25) via a support (9) received in a longitudinal opening (50) formed in a body of the piston (5, 15), allowing relative longitudinal sliding of the piston (5) around the support (9), A fluid compression device (1), characterized in that during translational movement of the piston (5), the body of the piston (5) slides around the support (9) without passing through the support (9).

2. 2. A fluid compression device (1) according to claim 1, characterized in that the longitudinal opening (50) of the piston (5, 15) is defined by a fork-shaped portion of the body of the piston (5) having several branch passages (125), the longitudinal opening (50) being formed by the spacing between the branch passages (125).

3. 3. A fluid compression device (1) according to claim 1 or 2, characterized in that the support (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 (9) being connected to the stationary structure (24, 25).

4. The fluid compression device (1) according to any one of claims 1 to 3, characterized in that the stationary central guide (8) is rigidly connected to the support (9) by at least one of screwing, fitting and elastic deformation, and the support (9) is rigidly connected to the stationary structure (24, 25), for example by butting, fitting, clamping or screwing.

5. The fluid compression device (1) according to any one of claims 1 to 4, characterized in that the support portion (9) is held stationary in the longitudinal direction in the stationary structure (24, 25) between two longitudinal holding stops (123, 124) located on either side of the support portion (9) in the longitudinal direction (A).

6. A fluid compression device (1) according to any one of claims 1 to 5, characterised in that the stationary structure comprises two tubular housing parts (24, 25) joined to each other longitudinally around the piston (5).

7. A fluid compression device (1) according to claim 6 dependent on claim 5, characterized in that at least one of the two tubular housing parts (24, 25) forms a longitudinal retention stop at one longitudinal end of the support part (9).

8. 8. A fluid compression device (1) according to claim 6 or 7, characterized in that the fluid compression 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) forming a longitudinal retention stop at one longitudinal end of the support part (9).

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

10. 10. The fluid compression device (1) according to claim 1, characterized in that the discharge orifice (7) is located at the terminal end of the stationary central guide (8), the fluid compression device (1) comprises a discharge circuit (11) for the compressed fluid having a first end connected to the discharge orifice (7) and a second end located opposite the first end in the longitudinal direction (A), the discharge circuit (11) for the compressed fluid passing through the body of the stationary central guide (8) and the support part (9).

11. Fluid compression device (1) according to any one of the preceding claims, characterized in that the body of the piston (5) is made from several parts joined longitudinally to one another in a disassemblable manner.

12. A fluid compression device (1) according to claim 11 dependent on claim 2, characterized in that the tubular portion (15) and the fork-shaped portion of the body of the piston (5) are longitudinally joined to one another in a disassemblable manner, for example by screwing.

13. 13. A fluid compression device (1) according to any one of claims 1 to 12, characterized in that the fluid compression device is a two-stage compression device, comprising a pre-compression chamber (3), a preceding suction system (2) in communication with the pre-compression chamber (3) designed to allow fluid to enter the pre-compression chamber (3), and a suction system (6) in communication with the pre-compression chamber (3) to allow compressed fluid in the pre-compression chamber (3) to be transferred to the compression chamber (4) for further compression.

14. The fluid compression device (1) according to any one of claims 1 to 13, characterized in that the fluid compression device comprises a fluid-tight housing (13) connected to the stationary structure (24, 25) and designed to accommodate a tank (16) of cryogenic fluid comprising an expansion space and a liquid phase, the compression chamber (4) being installed in the fluid-tight housing (13) so as to be immersed in the tank (16).

15. A station for filling tanks or lines with pressurized gas, said station comprising a source (17) of liquefied gas, in particular liquefied hydrogen, and a withdrawal circuit (18) having a first end connected to said source and at least one second end intended to be connected to a tank (190) to be filled, said withdrawal 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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