Cryogenic submersible pump system and cryogenic liquid storage

Abstract

The invention relates to a cryogenic submersible pump system for conveying and transferring a cryogenic liquid (8), as well as to a cryogenic liquid storage device containing the submersible pump system. The cryogenic submersible pump system comprises a cryogenic piston pump (1) with an electrodynamic linear motor as a drive, which can be installed within a storage container (7) containing the cryogenic liquid (8) and can be operated while immersed in the cryogenic liquid (8). The cryogenic submersible pump system and the cryogenic liquid storage device are particularly suitable for conveying and transferring low-boiling cryogenic liquids (8), for example, liquid hydrogen or liquid helium.

Description

The invention relates to a submersible pump system for conveying and transferring liquid cryogenic media and to a cryogenic liquid reservoir containing the submersible pump system. The cryogenic submersible pump system and the cryogenic liquid reservoir are particularly suitable for the delivery and transfer of low boiling cryogenic liquids, for example liquid hydrogen or liquid helium.Low-boiling cryogenic liquids, such as helium and hydrogen, which are liquefied with high energy input, tend to evaporate during the delivery and transfer even with low energy input, for example by rapid rotor or piston movements or by small pressure changes. Thus, after liquefaction, liquid helium is stored in large storage containers at a slight overpressure at usually 100 mbar to 200 mbar overpressure and, according to the boiling line, at a slightly elevated temperature and is transferred from these into transportable storage containers, in which the liquid helium is stored at atmospheric pressure, i.e. without overpressure. Due to the pressure drop during the transfer, the medium cools down in boiling, a large amount of evaporated helium (so-called flash gas) is produced, which must subsequently be re-liquefied again with high energy expenditure. In many other systems, too, a slight overpressure is frequently built up in the cryogenic initial storage container relative to the cryogenic target container in order to replenish the liquefied cryogenic medium, although a large amount of flash gas is also produced in these cases.One possible solution for bypassing the pressure drop is to store the liquefied cryogenic medium under atmospheric pressure without overpressure and to transfer it by means of a pump. Here, a pump is to be selected which generates no or only small amounts of flash gas. This, viewed over the entire value-drawing and supply chain, makes it possible to clearly save the energy required for providing the liquid cryogenic medium to the end user.Since there is fundamentally the intention of keeping the thermal connection from the pump low in the warmer surrounding area of the storage container, i.e. avoiding massive components with high thermal conductivity, for example metallic piston rods, in the connecting and transition areas, the use of pumps completely immersed in the cryogenic medium represents the most common solution.In this case, there is the possibility of using so-called cryogenic centrifugal pumps, as are used for transferring liquefied natural gas (engl. Liquid natural gas, LNG for short) can be used as standard. The use of centrifugal pumps for conveying and transferring cryogenic media leads to a high evaporation rate during the conveying process due to the high rotational speed of the impellers, which introduce significant amounts of mechanical and consequently thermal energy into the cryogenic medium, in particular with the low-boiling media helium and hydrogen. In addition, centrifugal pumps have the disadvantage that they always require a minimum suction pressure, i.e. they require a slight overpressure in the medium to be conveyed or supercooling of the medium to be conveyed, which in turn leads to the formation of flash gas. As a result, the use of a centrifugal pump is virtually unnecessary at low to moderate delivery rates, since the delivery can also be achieved-without the use of a pump-by merely increasing the pressure in the cryogenic initial storage container relative to the cryogenic target container.As an alternative to centrifugal pumps, DE 10 2008 011 456 A1 and DE 10 2008 011 456 B4 disclose a piston pump for conveying cryogenic liquids, which pump has an electrodynamic linear motor as drive. In order to ensure the functionality of the piston pump, correct installation in the storage container is required; this can be problematic, in particular in the case of storage containers with narrow container openings.It is the object of the invention to provide a cryogenic submersible pump system with a piston pump driven by an electrodynamic linear motor, which enables the piston pump to be properly installed in a storage container serving for receiving a cryogenic liquid in the simplest possible manner. In addition, a cryogenic liquid reservoir with the cryogenic submersible pump system is to be provided as the overall system.This object is achieved by a cryogenic submersible pump system having the features according to claim 1 and a cryogenic liquid reservoir according to claim 11 or 12. Practical further developments of the invention are set out in claims 2 to 10.According to the invention, the cryogenic submersible pump system for installation in a storage container serving for receiving a cryogenic liquid, i.e. a storage container for the cryogenic liquid, comprises a cryogenic piston pump with an electrodynamic linear motor as drive. The piston pump has a cylinder housing and a freely oscillating piston mounted in the cylinder housing so as to be displaceable along the longitudinal direction of the cylinder.The piston pump itself is preferably designed according to DE 10 2008 011 456 A1 and DE 10 2008 011 456 B4.It is provided that at least one permanent magnet is integrated in the piston and at least one drive coil is integrated in the cylinder wall, wherein the axis of the drive coil and the dipole axes of the permanent magnet run parallel. The piston is mounted in the cylinder housing so as to be displaceable parallel to the spool axis. The piston is moved back and forth exclusively by an alternating magnetic field generated with the aid of the drive coil. The drive thus formed is a linear motor in the so-called "moving magnet construction".Alternatively, a linear motor in the so-called "moving coil construction" is also conceivable as a drive, in which the magnetic field-generating drive coil is integrated in the piston and the magnet or the magnets are integrated in the cylinder wall.In an embodiment of the invention of the cryogenic piston pump as a double-acting pump, which is distinguished by a particularly high degree of efficiency, pump chambers are adjacent to both end face sides of the piston, the volumes of which pump chambers are alternately increased and decreased by the movement of the piston. Each pumping chamber has an inlet and an outlet. Both in the inlet and in the outlet there is a non-return valve which in each case allows the cryogenic liquid to pass through in the conveying direction and blocks flows counter to the conveying direction. As a result, in each case when the volume of the pump chambers is increased, the cryogenic liquid is sucked in via the inlet, and when the volume is decreased, the liquid is pushed out of the pump chamber and into the outlet. The piston pump, which is constructed as a double-acting pump, has a symmetrical construction with respect to the center position of the piston in the cylinder housing.Alternatively, the cryogenic piston pump can also be designed as a single-acting pump, in which a pump chamber adjoins only one end face of the piston. The pumping operation is analogous to the double acting pump, but using only one pumping chamber. However, the construction of such a piston pump is more complicated. The drive motor must act on a load with an asymmetric force characteristic. The center position of the oscillator becomes load-dependent and must be tracked electronically. The pump output is halved, the efficiency remains the same, the delivery regime becomes discontinuous.According to the invention, the cryogenic piston pump described is designed as a tube-like unit which extends along the cylinder longitudinal direction and is dimensioned in such a way that the cryogenic piston pump can be introduced into the storage container at least in one orientation through a container opening of the storage container which serves for filling or removing the cryogenic liquid. That is, the cryogenic piston pump only has to fit through the container opening in one orientation, that is to say, for example, through the passage of a container opening designed as a neck tube.The cryogenic submersible pump system in some embodiments comprises an inlet line connected to the cryogenic piston pump, namely to each inlet of the cryogenic piston pump, for aspirating the cryogenic liquid from the storage container, and an outlet line connected to the cryogenic piston pump, namely to each outlet of the cryogenic piston pump, for delivering the cryogenic liquid from the storage container. The inlet line, if designed in this way, has at least one suction connection which dips into the cryogenic liquid. According to the invention, the outlet line has an outlet line section which can be bent at a variable angle. The variably bendable outlet line section can be designed as a flexibly deformable line, for example as a so-called flex line, or as a pipe swivel joint.Furthermore, the cryogenic submersible pump system according to one embodiment has an electronic control and regulating unit attached to the cryogenic piston pump for controlling and regulating the cryogenic piston pump, and at least one energy supply line for supplying the cryogenic piston pump and the control and regulating unit with electrical energy.According to the invention, the submersible pump system also has a lead-through element which can be installed in the container opening of the storage container and serves for the lead-through of the energy supply line through the container opening of the storage container.According to the invention, the cryogenic submersible pump system is designed such that only the outlet line and the lead-through element with the energy supply line are led out of the storage container.Finally, the cryogenic submersible pump system comprises an installation cable for suspending and holding the cryogenic piston pump when it is introduced into or removed from the storage container. The installation cable is attached to the cryogenic piston pump at a suitable suspension point. The installation cable can remain within the storage container after installation of the cryogenic piston pump, for example for permanent mounting of the cryogenic piston pump; the installation cable can, however, also be removed completely. Preferably, the suspension point for the installation cable is located at one of the axial end regions of the cryogenic piston pump, so that the cryogenic piston pump is oriented approximately vertically with respect to the cylinder longitudinal direction, suspended freely from the installation cable; the outlet line leading to the lead-through element with the outlet line portion which can be bent at a variable angle branches off as far as possible at the opposite axial end region of the cryogenic piston pump.The cryogenic submersible pump system enables a quick installation of the cryogenic piston pump in the storage container even with a small container opening, i.e. with spatially limited access, such as for example in a liquid helium pot with a narrow neck tube. In its preferred embodiment, the cryogenic piston pump is installed as a double-acting pump with a symmetrical structure and with the shortest possible suction connection with respect to its longitudinal direction of the cylinder, preferably horizontally within the storage container. The cryogenic submersible pump system makes it possible to insert the cryogenic piston pump, aligned longitudinally with the container opening, in the storage container with a narrow container opening and to bring it into its functional position within the storage container. The installation cable and optionally the outlet line are usable for positioning in the storage container.The cryogenic submersible pump system is provided in particular for conveying and transferring cryogenic liquids down to a temperature of 4 K, i.e. in addition to, for example, liquid nitrogen, oxygen, argon, neon, methane or natural gas, also for conveying liquid hydrogen or liquid helium.The problems occurring in centrifugal pumps are avoided by the cryogenic submersible pump system, since the proposed piston pump, which does not require a minimum suction pressure, introduces only small amounts of mechanical and thereby thermal energy into the cryogenic liquid due to the slow piston movement, as compared to centrifugal pumps. Likewise, the reduced connections to the warmer environment ensure the introduction of thermal energy into the cryogenic liquid. The cryogenic submersible pump system thus enables the transfer of the cryogenic liquid between two containers at the same pressure level without appreciable formation of flash gas.According to the invention, the cryogenic liquid reservoir comprises, in addition to the described cryogenic submersible pump system, also the storage container and the cryogenic liquid accommodated in the storage container, wherein the cryogenic piston pump, which can be installed in the storage container, is submerged in the cryogenic liquid at least with the suction connection or connections of the inlet line and the control and regulating unit which is attached to the cryogenic piston pump in one embodiment. The control and regulation unit can in principle also be installed at room temperature. The introduction of the control and regulating unit into the cryogenic liquid improves the efficiency due to the greatly decreasing specific resistance of electrical conductor materials in the cryogenic temperature range.The cryogenic piston pump may include unslotted piston seals for sealing between the cylinder housing and the piston. The piston seals may be both unreinforced and spring-reinforced.The cryogenic piston pump can furthermore be designed in such a way that a specific axial parking position is provided for the piston along the cylinder longitudinal axis, which the piston assumes during the cooling-in process. When piston seals are used, the axial parking position of the piston sealed against the cylinder housing by means of the piston seals is, for example, a position of the piston in the cylinder housing at which there is freedom of contact between the piston seals and the cylinder housing. This prevents the piston seals from deforming mechanically during the cooling-in process.Furthermore, it can be provided that at least one intake connection of the inlet line of the cryogenic piston pump has in each case one intake valve which is controlled passively by springs or actively by the control and regulation unit.The power supply line and / or the electrodynamic linear motor, in particular the drive coil of the piston pump, can be constructed from conventional conductor material, for example from copper, or from a superconducting conductor material, for example a material based on bismuth strontium calcium copper oxide, yttrium barium copper oxide or niobium titanium.According to one embodiment, the cryogenic submersible pump system has a holding and tilting mechanism for holding the cryogenic piston pump in the storage container and for changing the pump orientation when the cryogenic piston pump is installed in the storage container, wherein the holding and tilting mechanism comprises the installation cable and a tilting rod. The installation cable is articulated to one axial end region of the cryogenic piston pump, while the tilting rod is articulated to the other axial end region of the cryogenic piston pump. The installation cable is attached together with the tilting rod in an articulated manner at a suspension point on the lead-through element. The lead-through element can in turn be connected to an attachment in the region of the container opening of the storage container. The installation cable and the tilting rod form a triangular suspension of the cryogenic piston pump. The installation cable is fastened at the suspension point on the lead-through element in a length-variable manner, so that by actuation of the installation cable, i.e. by pulling or lowering, the installation cable section within the triangular suspension can be enlarged or reduced. The holding and tilting mechanism allows the cryogenic piston pump to be folded in and out relative to the outlet line by the installation cable actuation; the holding and tilting mechanism is therefore also referred to as a fold-out mechanism. The variably bendable outlet line section is preferably arranged on the side of the end region of the cryogenic piston pump connected to the tilting rod. During folding and unfolding, the variably adjustable outlet line section enables the adaptation of the rigid areas of the outlet line. After installation of the cryogenic piston pump in the storage container, the triangular suspension also serves for the permanent, contact-free mounting of the cryogenic piston pump in the storage container.As already described, the outlet line section which can be bent at a variable angle can be designed as a flexibly deformable line or as the pipe swivel joint, which in the present case is also understood to mean designs such as, for example, rotary feedthroughs or swivel joint scissors. Since flexibly deformable lines can only be bent up to a minimum permissible bending radius, this embodiment requires a minimum volume in the storage container. If, on the other hand, there is a small amount of space available in the storage container, the variably adjustable outlet line section can be designed as a pipe swivel joint.The pipe swivel joint (also referred to as pipe swivel joint) preferably comprises two hollow screw stubs which can be rotated relative to one another in scissors-like manner and which are connected by means of a screw connection and are sealed by means of a movable seal. The movable seal is located between the two hollow screw stubs; the hollow screw stubs are joined together, for example, by means of a screw which is sealed on both sides. Two rigid pipe pieces of the outlet line adjoin the pipe swivel joint, so that the outlet line is designed to be flexible, media-tight and fluid-line-capable in the outlet line section that can be bent variably through the pipe swivel joint.Furthermore, it can be provided that the cryogenic submersible pump system or the cryogenic liquid reservoir has a pump receiving adapter which is geometrically matched to the container bottom of the reservoir container and can be detachably connected to the cryogenic piston pump. The pump receiving adapter can be anchored, for example, to a shaping of the container base, adapt to the container base due to gravity or can already be fixedly installed by the storage container manufacturers. The cryogenic piston pump is suspended from the installation cable during installation, i.e. regularly in the vertical position, and is stranded off through the container opening of the storage container and locked at a suitable coupling point in the storage container with the aid of the pump receiving adapter.The invention is explained in more detail below on the basis of exemplary embodiments and with reference to the schematic drawings, wherein identical or similar features are provided with identical reference numerals; in this regard, FIG. 1 shows an embodiment of the cryogenic submersible pump system in a side view with a partial perspective illustration, FIG. 2 : the cryogenic liquid reservoir with the cryogenic submersible pump system in a sectional illustration and a partial side view, FIG. 3 : the cryogenic piston pump in a longitudinal sectional illustration, FIG. 4 : a first installation variant with pump receiving adapter in a sectional illustration, FIG. 5 shows a second installation variant with pump receiving adapter in a sectional illustration, and FIG. 6 : a third installation variant with pump receiving adapter in a sectional illustration.The cryogenic submersible pump system according to FIG. 1 comprises the cryogenic piston pump 1, which is designed as a double-acting pump and on the two axial end regions of which the intake connections 2.1 of the inlet line 2 are attached. These each have a suction valve with spring-assisted control. The outlet line 3 is attached to the cryogenic piston pump 1 on both sides in the form of partial strings; the two partial strings of the outlet line 3 are joined together upstream of the outlet line section which can be bent at a variable angle. The outlet line section which can be bent at a variable angle is formed by the flexibly deformable line in the form of the flexible line 3.1 shown in the main illustration of FIG. 1. As an alternative to the flex line 3.1, the outlet line section which can be bent at a variable angle can be realized by the rotary pipe joint 3.2.The installation cable 4 and the tilting rod 5 form a triangular suspension for the cryogenic piston pump 1. The lead-through member 6, to the lower end of which the installation cable 4 and the tilting rod 5 are attached, exclusively guides the unillustrated power supply line.FIG. 2 illustrates the cryogenic submersible pump system configured according to FIG. 1 after being introduced into the storage container 7. the cryogenic piston pump 1 is completely submerged in the cryogenic liquid 8, such that the cryogenic liquid 8 can be sucked in for transfer via the inlet line 2 and can be conveyed out of the storage container 7 via the outlet line 3. The cryogenic piston pump 1 is folded in for insertion or removal-as described under FIG. 1-so that it can be guided in a vertically hanging manner through the container opening 7.1 in the region of the neck tube of the storage container 7.The cryogenic piston pump 1-see FIG. 3-basically has the structure known from the prior art according to DE 10 2008 011 456 A1 or DE 10 2008 011 456 B4, shown here as a double-acting pump. It comprises the cylinder housing 11, in which the piston 10 is mounted movably in the cylinder longitudinal direction. A plurality of permanent magnets 10.1 are embedded in the piston 10 with an exact fit and without a protrusion, wherein the dipole axes of all permanent magnets 10.1 run parallel to the longitudinal direction of the cylinder. The cylinder housing 11 is of one-piece construction, and its inner sides form the liners. The outside of the cylinder housing 11 serves as a support for the drive coil 11.1. For this purpose, a circumferential recess is made in the outer side, in which recess the drive coil 11.1 is located.On each end face of the cylinder housing 11 there is a respective cylinder head cover 16. The piston 10 encloses a pump chamber 12 with the liner and the respective cylinder head cover 16. In the cylinder head cover 16 there is a pump chamber opening 13 which serves for the inflow and outflow of the cryogenic liquid 8 to be delivered.On the cylinder head cover 16 there is located in each case the inlet line 2 with an inlet check valve 14 connected in the inflow direction and the outlet line 3 with an outlet check valve 15 connected in the outflow direction.FIGS. 4 to 6 show different variants of the introduction of the cryogenic piston pump 1 into the storage container 7 by means of the pump receiving adapter 9. The cryogenic piston pump 1 is lowered in a vertical orientation through the container opening 7.1 of the storage container 7 from above by means of the installation cable 4 and locked at a suitable coupling point in the storage container 7 with the aid of the pump receiving adapter 9. The installation cable 4 can be removed from the container if necessary after the cryogenic piston pump 1 is placed down or latched in, if the cryogenic piston pump 1 is intended to remain permanently in the storage container 7.Numerous storage containers 7 do not have a flat container base; for example, a curved elevation 7.2 is found centrally on the container base in conventional, transportable 1000-liter liquid helium pots. According to FIG. 4, this curved elevation 7.2 on the container bottom of the storage container 7 is used as a latching point for tilting and positioning the cryogenic piston pump 1 or the pump receiving adapter 9.A further embodiment shown in FIG. 5 is to adapt the external shape of the cryogenic piston pump 1 to the container base of the storage container 7 by means of the pump receiving adapter 9. For example, the pump receiving adapter 9 can correspond to the curvature of the container bottom, so that the cryogenic piston pump 1 automatically moves into position by gravity with the aid of the pump receiving adapter 9 after it has been laid down onto the container bottom of the storage container 7.Furthermore, as shown in FIG. 6, the pump receiving adapter 9, which is adapted to the cryogenic piston pump 1, in particular its pump contour, can be pre-mounted in the storage container 7 on the manufacturer side, for example in the form of a half shell which serves for fixing the cryogenic piston pump 1.List of reference characters1 Piston pump 2 inlet line 2.1 inlet connection 3 outlet line 3.1 flex line 3.2 pipe pivot joint 4 installation cable 5 tilting rod 6 passage element 7 storage container 7.1 container opening 7.2 curved elevation 8 cryogenic liquid 9 pump receiving adapter 10 piston 10.1 permanent magnet 11 cylinder housing 11.1 drive coil 12 pump chamber 13 pump chamber opening 14 inlet non-return valve 15 outlet non-return valve 16 cylinder head coverReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedDE 10 2008 011 456 A1 [0006, 0010, 0037]DE 10 2008 011 456 B4 [0006, 0010, 0037]

Claims

Cryogenic submersible pump system for installation in a storage container (7) serving for receiving a cryogenic liquid (8), which container has a container opening (7.1) for filling or removing the cryogenic liquid (8), wherein the cryogenic submersible pump system comprises: - a cryogenic piston pump (1) with an electrodynamic linear motor as drive, wherein the cryogenic piston pump (1) comprises a cylinder housing (11) and a freely oscillating piston (10) mounted in the cylinder housing (11) such that it can be displaced along the cylinder longitudinal direction, and wherein the cryogenic piston pump (1) is designed as a tube-like unit extending along the cylinder longitudinal direction, which unit is dimensioned such that the cryogenic piston pump (1) can be introduced into the storage container (7) at least in one orientation through the container opening (7.1), at least one energy supply line for supplying the cryogenic piston pump (1) with electrical energy, - an outlet line (3) connected to the cryogenic piston pump (1) for conveying the cryogenic liquid (8) from the storage container (7), and - an inlet line (2) connected to the cryogenic piston pump (1) for aspirating the cryogenic liquid (8) from the storage container (7), characterized in that - the outlet line (3) has an outlet line section which can be bent in a variable manner, - the inlet line (2) has at least one intake connection (2.1) which dips into the cryogenic liquid (8), - the cryogenic immersion pump system has a passage element (6) which can be installed in the container opening (7.1) of the storage container (7) for passing through the energy supply line, wherein the cryogenic immersion pump system is designed such that, exclusively the outlet line (3) and the feed-through element (6) with the power supply line are guided out of the storage container (7), and - the cryogenic submersible pump system has an installation cable (4) for suspending and holding the cryogenic piston pump (1) when it is introduced into or removed from the storage container (7).Cryogenic submersible pump system according to claim 1, characterized in that the cryogenic piston pump (1) further comprises an electronic control and regulation unit attached to the cryogenic piston pump (1) for controlling and regulating the cryogenic piston pump (1).Cryogenic submersible pump system according to claim 2, characterised in that the cryogenic piston pump (1) has unslotted piston seals for sealing between the cylinder housing (11) and the piston (10).Cryogenic submersible pump system according to claim 3, characterised in that the cryogenic piston pump (1) is designed in such a way that the piston (10) sealed against the cylinder housing (11) by means of piston seals has at least one axial parking position along the cylinder longitudinal direction at which there is freedom of contact between the piston seals and the cylinder housing (11).Cryogenic submersible pump system according to one of Claims 1 to 4, characterized in that the energy supply line and / or the electrodynamic linear motor has a superconducting conductor material.Cryogenic submersible pump system according to one of claims 1 to 5, characterised in that the cryogenic submersible pump system has a holding and tilting mechanism for holding the cryogenic piston pump (1) in the storage container (7) and for changing the pump orientation when the cryogenic piston pump (1) is installed in the storage container (7), wherein the holding and tilting mechanism comprises the installation cable (4) and a tilting rod (5), and wherein the installation cable (4) is fastened in an articulated manner at one axial end region of the cryogenic piston pump (1), the tilting rod (5) is fastened in an articulated manner at the other axial end region of the cryogenic piston pump (1) and the installation cable (4) together with the tilting rod (5) is fastened in an articulated manner at a suspension point on the feed-through element (6), such that the installation cable (4) and the tilting rod (5) form a triangular suspension of the cryogenic piston pump (1), wherein the installation cable (4) is fastened at the suspension point on the lead-through element (6) in such a way that the length of the installation cable section within the triangular suspension can be enlarged or reduced by actuating the installation cable (4).Cryogenic submersible pump system according to claim 6, characterised in that the variably adjustable outlet line section is arranged on the side of the axial end region of the cryogenic piston pump (1) connected to the tilting rod (5).Cryogenic submersible pump system according to any one of claims 1 to 7, characterised in that the variably bendable outlet line section is a flexibly deformable line.Cryogenic submersible pump system according to one of claims 1 to 8, characterised in that the outlet line section, which can be bent in a variable manner, has a pipe swivel joint (3.2), wherein the pipe swivel joint (3.2) has two hollow screw stubs which can be rotated relative to one another in a scissors-like manner and which are connected by means of a screw connection and are sealed off by means of a movable seal.Cryogenic submersible pump system according to one of Claims 1 to 9, characterized in that it furthermore has a pump receiving adapter (9) which is geometrically matched to the container base of the storage container (7) and can be detachably connected to the cryogenic piston pump (1).Cryogenic liquid store with a cryogenic submersible pump system according to one of Claims 1 to 10, wherein the cryogenic liquid store comprises, in addition to the cryogenic submersible pump system, also the storage container (7) and the cryogenic liquid (8) accommodated in the storage container (7), characterized in that the cryogenic piston pump (1), which can be installed in the storage container (7), is submerged in the cryogenic liquid (8) after installation in the storage container (7), at least with the suction connection piece or pieces (2.1) of the inlet line (2) and the suction connection piece or pieces (2.1) of the inlet line (2) at the cryogenic piston pump (1).Cryogenic liquid store with a cryogenic submersible pump system according to one of Claims 2 to 10, wherein the cryogenic submersible pump system has the control and regulating unit according to Claim 2, and wherein the cryogenic liquid store comprises, in addition to the cryogenic submersible pump system, also the storage container (7) and the cryogenic liquid (8) accommodated in the storage container (7), characterized in that the cryogenic piston pump (1), which can be installed in the storage container (7), is submerged in the cryogenic liquid (8) after installation in the storage container (7), at least with the suction connection piece or pieces (2.1) of the inlet line (2) and the control and regulating unit attached to the cryogenic piston pump (1).

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