The invention relates to a fluid compression apparatus (1) comprising a sealed enclosure (13) intended to contain a bath (16) of cryogenic fluid, a first (3) and a second (4) compression chambers, an intake system (2) for admission into the first chamber (3), a system (6) for transfer from the first (3) to the second (4) chamber, the apparatus (1) further comprising a communicating discharge orifice (7) for compressed fluid to leave the second chamber, the apparatus (1) further comprising a discharge orifice provided with a valve (9) for discharge from the first compression chamber (3) to the bath (16) so as to let surplus liquid leave during compression of fluid in the first chamber (3), the discharge orifice communicating with the enclosure (13) via at least one flow retarder (10) configured to attenuate the speed and/or intensity of the discharged liquid flow by limiting its pressure drop.

A hydrogen fueling station includes a cryogenic pump with a hydrogen piston at least partially positioned within a hydrogen pump cylinder. A variable volume working chamber is defined at least in part by the hydrogen piston, a seal extending around the piston, and an end portion of the hydrogen pump cylinder opposite the first end portion of the first hydrogen pump cylinder. The hydrogen pump cylinder is coupled with a coupler to a thermal decoupling cylinder. The seal provides hydrogen leakage at a first pressure in the variable volume working chamber to an area beneath the seal. A blow by seal mounted to the first coupler provides hydrogen leakage to the thermal decoupling cylinder. A relief valve provides hydrogen leakage out of the thermal decoupling cylinder. The first hydrogen pressure is greater than the second hydrogen pressure, and the second hydrogen pressure is greater than the third hydrogen pressure.

A hydrogen fueling station includes a hydrogen supply header, a hydrogen pump cylinder, and a hydrogen piston, the hydrogen piston including a piston seal. The hydrogen pump cylinder is configured to receive hydrogen from the hydrogen supply header. The hydrogen piston, the piston seal, and the hydrogen pump cylinder define at least in part a variable working chamber. The hydrogen piston is configured to provide a stroke length of greater than 310 mm.

A hydrogen fueling station includes a cryogenic pump hydraulic system with two hydraulic cylinders including hydraulic pistons with piston seals separating low pressure portions of the hydraulic cylinders above the piston seals from high pressure portions of the hydraulic cylinders beneath the piston seals. At least one first hydraulic volume source is configured to selectively communicate fluid between the first high pressure portion and the second high pressure portion. A first controllable valve is configured to selectively place the first and second low pressure portion in fluid communication with at least one low-pressure line. A second controllable valve is configured to selectively place at least one second hydraulic volume source in fluid communication with the first high pressure portion. A third controllable valve is configured to selectively place the at least one second hydraulic volume source in fluid communication with the second high pressure portion.

A hydrogen fueling station includes a cryogenic pump with a hydraulic cylinder including a hydraulic piston. The hydraulic piston includes a piston seal separating a low pressure portion of the hydraulic cylinder above the piston seal from a high pressure portion of the hydraulic cylinder beneath the piston seal. A thermal decoupling rod is fixedly coupled to an upper end of the first hydraulic piston. A hydrogen piston within a first hydrogen pump cylinder is located above the thermal decoupling rod and aligned with an upper end of the thermal decoupling rod.

Device for pumping liquid hydrogen including, arranged in series between an inlet for fluid to be compressed and an outlet for compressed fluid, a first compression member with a piston forming a first compression stage and a second compression member with a piston forming a second compression stage. The first compression member compresses the liquid hydrogen to a supercritical state. The second compression member compresses the supercritical hydrogen from the first compression member to an increased pressure, in particular, between 200 and 1000 bar.

A pump arrangement for providing a saturated or subcooled liquid includes a tank for saturated liquid, a heat exchanger for cooling the saturated liquid, a pump, an expansion valve, and an output for feeding saturated or subcooled liquid to a consumer. A tank outlet is in fluid communication with a liquid inlet of the heat exchanger, such that saturated liquid stored inside the tank can flow into the heat exchanger designed to sub-cool the saturated liquid. A liquid outlet of the heat exchanger is in fluid communication with a pump inlet. The expansion valve outlet is in fluid communication with a coolant inlet of the heat exchanger. An expansion valve inlet is arranged for receiving and expanding a fraction of liquid flowing through the pump arrangement and routing it into the coolant input to at least partially evaporate and receive evaporation enthalpy of the liquid to be subcooled.

The invention relates to a fluid compression device comprising a compression chamber accommodating a piston that is able to move between first and second ends of the compression chamber, the device comprising a regeneration circuit connecting the first and second ends of the compression chamber and having a regenerator, the supply pipe comprising a set of one or more valves, the device comprising at least one compressed-fluid discharge pipe comprising an upstream end connected to the compression chamber and a downstream end intended to be connected to a receiver of the compressed fluid, the device comprising a bypass pipe comprising an upstream end connected to the regeneration circuit and a downstream end connected to a recovery member, the bypass pipe being configured to draw a fluid fraction during a regeneration phase during which the piston is moved from the second end towards the first end of the compression chamber.

The invention relates to a fluid compression apparatus and method comprising first and second compression chambers, an intake system into the first chamber, a transfer system from the first chamber to the second chamber, a piston for ensuring the compression of the fluid in the first and second chambers, and an orifice for discharging the compressed fluid, the intake system comprising one or more valves, the apparatus further comprising a discharge orifice allowing communication between the first compression chamber and the bath to allow surplus liquid trapped in the first compression chamber to leave during a compression movement of the piston in the first compression chamber, the apparatus comprising a discharge valve configured to control the discharge of liquid via the discharge orifice and to prevent fluid from entering the compression chamber via the discharge orifice.

A hydraulic cylinder, in particular for a hydrogen tank pressurization installation, including a cylindrical body of longitudinal axis having a first low-pressure cylindrical body portion and a second high-pressure cylindrical body portion, a piston being mounted in the first cylindrical body portion and being mounted at a first end of a piston rod slidably extending in the second cylindrical body portion. A second end of the rod opposite the first end carries a removable cartridge slidably sealed in the second part of the cylindrical body, the second part of the cylindrical body being sealed by a removable shutter member arranged longitudinally opposite the removable cartridge.