Cryogenic liquid storage equipment and liquid level measuring device

Abstract

The invention discloses low-temperature liquid storage equipment and a liquid level measuring device. The cryogenic liquid storage apparatus includes: a storage container configured to contain a cryogenic liquid; a housing member disposed in the storage container and configured to define a vacuum space spatially separated from an internal space of the storage container; and a temperature sensor disposed in the vacuum space and in contact with an inner surface of the housing member, and sensing a signal to detect a liquid level of the cryogenic liquid.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0108577 filed in the Korean Intellectual Property Office on August 18, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to a cryogenic liquid storage device and a liquid level measuring device, and more particularly, to a cryogenic liquid storage device and a liquid level measuring device capable of accurately detecting the amount of stored cryogenic liquid and improving stability and reliability. Background Art

[0004] A fuel cell system refers to a system that generates electric energy through a redox reaction between hydrogen and oxygen. As an alternative solution that can solve global environmental problems, research and development of fuel cell systems has been ongoing.

[0005] Recently, in order to increase the energy storage density per unit volume of fuel (e.g., hydrogen) used in a fuel cell system, various attempts have been made to store liquid hydrogen (LH2) in a storage container at low temperatures (e.g., 20 to 33 K) and supply the hydrogen (LH2 or GAS hydrogen) stored in the storage container to a fuel cell stack. Summary of the invention

[0006] The present disclosure is directed to providing a cryogenic liquid storage device and a liquid level measuring apparatus capable of accurately detecting the amount of stored cryogenic liquid and improving stability and reliability.

[0007] In particular, the present disclosure is directed to accurately measuring the level of cryogenic liquid and accurately and precisely managing (regulating) the amount of vaporized cryogenic liquid stored in a storage vessel and the pressure in the storage vessel.

[0008] Furthermore, the present disclosure is directed to detecting the liquid level of the cryogenic liquid based on a signal sensed by a temperature sensor, preventing the temperature sensor from being directly exposed to the cryogenic liquid and minimizing deformation and damage of the temperature sensor.

[0009] The present disclosure also seeks to minimize the amount of heat transferred to the cryogenic liquid from outside the storage container.

[0010] In addition, the present disclosure is directed to ensuring durability and safety, minimizing hydrogen loss (hydrogen exhaust amount) and delaying the hydrogen loss point as much as possible (extending hydrogen loss-free storage period).

[0011] Objects to be achieved by the embodiments are not limited to the above-mentioned objects, but also include objects or effects that can be understood from the following solutions or embodiments.

[0012] An exemplary embodiment of the present disclosure provides a cryogenic liquid storage device, which includes: a storage container, configured to contain a cryogenic liquid; a shell member, disposed in the storage container and configured to define a vacuum space separated from an internal space of the storage container; and a temperature sensor, disposed in the vacuum space and in contact with an inner surface of the shell member, and configured to sense a signal to detect a liquid level of the cryogenic liquid.

[0013] According to an exemplary embodiment of the present disclosure, a storage container may include: an inner container configured to contain a cryogenic liquid; an outer container surrounding the inner container; and a vacuum insulation layer defined between the inner container and the outer container, and a vacuum space may be communicated with the vacuum insulation layer.

[0014] According to an exemplary embodiment of the present disclosure, the shell component may include: a shell body; a sealing portion that seals one end of the shell body; and an opening portion that is arranged at the other end of the shell body, and the opening portion can be connected to an inner port arranged in the inner container and communicated with the vacuum insulation layer.

[0015] According to an exemplary embodiment of the present disclosure, the cryogenic liquid storage device may include: a blocking member blocking a gap between the other end of the housing body and the inner port.

[0016] According to an exemplary embodiment of the present disclosure, a temperature sensor may include: a sensing element disposed in contact with an inner surface of a housing member and configured to sense a temperature of a cryogenic liquid through the housing member; and a sensor substrate supporting the sensing element.

[0017] According to an exemplary embodiment of the present disclosure, a cryogenic liquid storage device may include: a support portion supporting a temperature sensor so that the temperature sensor is in close contact with an inner surface of a housing member in a vacuum space.

[0018] According to an exemplary embodiment of the present disclosure, the support portion may include a spring member elastically supporting the temperature sensor so that the temperature sensor elastically comes into close contact with an inner surface of the housing member.

[0019] According to an exemplary embodiment of the present disclosure, the support portion may include a guide plate accommodated in the housing member and configured to support the spring member.

[0020] According to an exemplary embodiment of the present disclosure, the spring member may be supported by the guide plate together with the temperature sensor and accommodated in the housing member.

[0021] According to an exemplary embodiment of the present disclosure, a cryogenic liquid storage device may include: an external port disposed in an outer container; a port cover configured to seal the external port; and a cable penetration piece disposed in the port cover so that a cable electrically connected to a temperature sensor passes through the cable penetration piece.

[0022] According to an exemplary embodiment of the present disclosure, a cryogenic liquid storage device may include: a heat transfer medium interposed between a temperature sensor and an inner surface of a housing member.

[0023] According to an exemplary embodiment of the present disclosure, the temperature sensor may be provided as a plurality of temperature sensors spaced apart from each other in a longitudinal direction of the housing member.

[0024] According to an exemplary embodiment of the present disclosure, the housing member may be disposed in the gravity direction.

[0025] According to an exemplary embodiment of the present disclosure, the housing member may be disposed to be inclined with respect to the direction of gravity.

[0026] According to an exemplary embodiment of the present disclosure, a cryogenic liquid storage device may include a protruding housing portion protruding from an outer surface of a housing member, being integrally formed with the housing member, and defining an accommodation space for accommodating a temperature sensor.

[0027] According to an exemplary embodiment of the present disclosure, a cryogenic liquid storage device may include a thermally conductive member surrounding a temperature sensor and disposed in surface contact with an inner surface of a housing member.

[0028] According to an exemplary embodiment of the present disclosure, a cryogenic liquid storage device may include: a first planar contact portion, which is arranged on an inner surface of a shell member and is arranged to be in surface contact with one surface of the heat-conducting member; and a second planar contact portion, which is arranged on the inner surface of the shell member and is arranged to be in surface contact with another surface of the heat-conducting member.

[0029] According to an exemplary embodiment of the present disclosure, the thermal conduction member may have a triangular cross-sectional shape.

[0030] Another exemplary embodiment of the present disclosure provides a liquid level measuring device, which is configured to measure the liquid level of a cryogenic liquid contained in a storage container, the liquid level measuring device comprising: a shell member, which is disposed in the storage container and is configured to define a vacuum space spatially separated from an internal space of the storage container; and a temperature sensor, which is disposed in the vacuum space and in contact with an inner surface of the shell member, and is configured to sense a signal to detect the liquid level of the cryogenic liquid.

[0031] According to an exemplary embodiment of the present disclosure, a storage container may include: an inner container configured to contain a cryogenic liquid; an outer container surrounding the inner container; and a vacuum insulation layer defined between the inner container and the outer container and communicating with a vacuum space.

[0032] As discussed, the methods and systems suitably employ a controller or processor.

[0033] In another embodiment, a vehicle is provided that includes the apparatus disclosed herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a view for explaining a cryogenic liquid storage apparatus according to an exemplary embodiment of the present disclosure.

[0035] Figure 2 1 is a view for explaining a housing member of a cryogenic liquid storage device according to an embodiment of the present disclosure.

[0036] Figure 3 1 is a view for explaining a liquid level detector and a support portion of a cryogenic liquid storage device according to an embodiment of the present disclosure.

[0037] Figure 4 1 is a view for explaining a fitting part of a cryogenic liquid storage device according to an embodiment of the present disclosure.

[0038] Figure 5 and Figure 6 1 is a view for explaining an assembling process of a liquid level detector of a cryogenic liquid storage device according to an embodiment of the present disclosure.

[0039] Figure 7 1 is a view for explaining a temperature sensor of a cryogenic liquid storage device according to an embodiment of the present disclosure.

[0040] Figure 8 1 is a view for explaining a protruding case portion of a cryogenic liquid storage device according to an embodiment of the present disclosure.

[0041] Fig. 9 2 is a view for explaining a heat conduction member of a cryogenic liquid storage apparatus according to an embodiment of the present disclosure.

[0042] Description of Reference Numerals

[0043] 10: Cryogenic liquid storage equipment 100: Storage container

[0044] 110: inner container 112: inner port

[0045] 120: Outer container 122: Outer port

[0046] 124: Port cover 126: Cable penetration

[0047] 130: vacuum insulation layer 200, 200': shell member

[0048] 200a': first plane contact portion 200b': second plane contact portion

[0049] 202: vacuum space 210: shell body

[0050] 220: Sealing part 230: Opening part

[0051] 240: protruding housing portion 242: storage space

[0052] 250: blocking member 252: accessory part

[0053] 300: Liquid level detector 310: Temperature sensor

[0054] 312: Sensing element 313: Cable

[0055] 314: sensor substrate 320: heat transfer medium

[0056] 400: Supporting part 410: Spring member

[0057] 420: guide plate 500: heat conduction member

[0058] 600: Guide rod DETAILED DESCRIPTION

[0059] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0060] However, the technical spirit of the present disclosure is not limited to some embodiments described herein, but can be implemented in various forms. Within the scope of the technical spirit of the present disclosure, one or more of the constituent elements in the embodiments can be selectively combined and replaced for use.

[0061] In addition, unless otherwise specifically and clearly defined and explained, the terms (including technical terms and scientific terms) used in the embodiments of the present disclosure can be interpreted as the meanings that are generally understood by ordinary technicians in the field to which the present disclosure belongs. The meanings of common terms such as terms defined in dictionaries can be interpreted in consideration of the contextual meanings of the relevant technology.

[0062] In addition, the terms used in the embodiments of the present disclosure are for explaining the embodiments but are not for limiting the present disclosure.

[0063] It is understood that the term "vehicle" or "vehicular" or other similar terms as used herein generally include motor vehicles, such as passenger vehicles including sport utility vehicles (SUVs), buses, trucks, various commercial vehicles, watercraft including various ships and boats, aircraft, etc., and include hybrid vehicles, electric vehicles, plug-in hybrid vehicles, hydrogen-powered vehicles, and other alternative fuel (e.g., fuels derived from resources other than petroleum) vehicles. As referred to herein, a hybrid vehicle is a vehicle having two or more power sources, such as a gasoline and electric dual-power vehicle.

[0064] The terms used herein are only used for the purpose of describing specific embodiments and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "the" as used herein are also intended to include plural forms. These terms are only intended to distinguish one component from another component, and these terms do not limit the properties, order or sequence of the components. It will be further understood that the terms "including" and / or "comprising" when used in this specification illustrate the existence of the features, integers, steps, operations, elements and / or components, but do not exclude the existence or addition of one or more other features, integers, steps, operations, elements, components and / or their groups. The term "and / or" as used herein includes any one and all combinations of one or more related listed items. Throughout the specification, unless there is a clear contrary description, the word "including" and variants such as "including" or "comprising" will be understood to imply the inclusion of the elements, but do not exclude any other elements. In addition, the terms "unit", "-device", "-piece" and "module" described in the specification refer to units for processing at least one function and operation, and can be implemented by hardware components or software components and combinations thereof.

[0065] Although the exemplary embodiments are described as using multiple units to perform the exemplary processes, it is understood that the exemplary processes can also be performed by one or more modules. In addition, it is understood that the term controller / control unit refers to a hardware device including a memory and a processor, and is specifically programmed to perform the processes described herein. The memory is configured to store these modules, and the processor is specifically configured to run the modules to perform one or more processes described further below.

[0066] In addition, the control logic of the present disclosure may be implemented as non-transitory computer-readable media on a computer-readable medium containing executable program instructions executed by a processor, controller, etc. Examples of computer-readable media include, but are not limited to, ROM, RAM, compact disk (CD)-ROM, magnetic tape, floppy disk, flash drive, smart card, and optical data storage device. The computer-readable medium may also be distributed in a networked computer system so that the computer-readable medium is stored and executed in a distributed manner, for example, by a telematics server or a controller area network (CAN).

[0067] Unless specifically stated or apparent from the context, as used herein, the term "about" is understood to be within the normal tolerance range in the art, such as within 2 standard deviations of the mean. "About" may be understood to be within 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, 0.5%, 0.1%, 0.05%, or 0.01% of the stated value. Unless otherwise clear from the context, all numerical values ​​provided herein are modified by the term "about".

[0068] In this specification, unless otherwise specifically stated, a singular form may also include a plural form. The expression "at least one (or one or more) of A, B, and C" may include one or more of all combinations that can be obtained by combining A, B, and C.

[0069] In addition, terms such as first, second, A, B, (a), and (b) may be used to describe constituent elements of the embodiments of the present disclosure.

[0070] These terms are used only for the purpose of distinguishing one constituent element from another constituent element, and the nature, order or sequence of the constituent elements is not limited by these terms.

[0071] In addition, when a constituent element is described as being “connected,” “coupled” or “attached” to another constituent element, the one constituent element may be directly connected, coupled or attached to the other constituent element, or connected, coupled or attached to the other constituent element by means of another constituent element interposed between the one constituent element and the other constituent element.

[0072] In addition, the expression "one constituent element is disposed or arranged above (upper) or below (lower) another constituent element" includes not only the case where the two constituent elements are in direct contact with each other but also the case where one or more other constituent elements are disposed or arranged between the two constituent elements. The expression "above (upper) or below (lower)" may refer to not only the upward direction based on one constituent element but also the downward direction based on one constituent element.

[0073] Reference Figures 1 to 9According to an embodiment of the present disclosure, a cryogenic liquid storage device 10 may include: a storage container 100, configured to accommodate a cryogenic liquid; a shell member 200, disposed in the storage container 100 and configured to define a vacuum space 202 spatially separated from an internal space of the storage container 100; and a liquid level detector 300, including a temperature sensor 310, which is disposed in the vacuum space 202 and in contact with an inner surface of the shell member 200, and the liquid level detector 300 is configured to detect the liquid level of the cryogenic liquid based on a signal sensed by the temperature sensor 310.

[0074] This allows accurate detection of the amount of stored cryogenic liquid (liquid hydrogen) and improves stability and reliability.

[0075] That is, in order to effectively operate the fuel cell stack, it may be necessary to accurately adjust the amount of vaporized cryogenic liquid (liquid hydrogen) stored in the storage container 100 and the pressure in the storage container 100 in response to the operating conditions of the fuel cell stack. To this end, it is necessary to accurately detect the amount of stored cryogenic liquid.

[0076] However, in the prior art, it may be difficult to accurately detect the amount of stored cryogenic liquid stored in the storage container, which leads to the following problem: it is difficult to accurately adjust the amount of vaporized cryogenic liquid (liquid hydrogen) stored in the storage container and the pressure in the storage container in response to the operating conditions of the fuel cell stack.

[0077] In particular, below a critical pressure (about 13 bar), the cryogenic liquid stored in the storage container can be divided into liquid (liquid hydrogen) and gas (gas hydrogen). If the phase of the cryogenic liquid is divided into two phases (liquid phase and gas phase), it is necessary to detect the amount of the stored cryogenic liquid by measuring the liquid level of the cryogenic liquid. However, since the cryogenic liquid has a low temperature (e.g., 20 to 33K), when a sensor configured to detect the liquid level of the cryogenic liquid is directly exposed to the cryogenic liquid, the sensor is deformed and damaged, which leads to the problem of difficulty in accurately detecting the liquid level of the cryogenic liquid.

[0078] In addition, in order to install a sensor configured to detect the liquid level of cryogenic liquid in a storage container, a cable electrically connected to the sensor needs to pass through the storage container, which may cause a problem of unnecessary heat being transferred to the cryogenic liquid through the cable.

[0079] In particular, when the pressure in the storage container increases as heat is applied to the storage container (the pressure increases due to vaporization of liquid hydrogen), there may be a problem in which the amount of hydrogen discharged from the storage container (the amount of hydrogen loss) increases and the hydrogen loss-free storage period (dormant period) is shortened.

[0080] In addition, the gap between the cable electrically connected to the sensor and the port (or hole) through which the cable passes in the storage container may need to be sealed by a non-metallic material such as epoxy resin. However, the non-metallic material may be easily damaged by hardening in a low-temperature environment (at the low temperature of the cryogenic liquid), which leads to the problem of reduced thermal insulation and sealing properties of the storage container.

[0081] However, according to an embodiment of the present disclosure, the liquid level of the cryogenic liquid can be detected based on the signal sensed by the temperature sensor 310, and the temperature sensor 310 is disposed in the vacuum space 202 defined in the housing member 200 and isolated from the cryogenic liquid without being directly exposed to the cryogenic liquid. Therefore, since the temperature sensor 310 is not directly exposed to the cryogenic liquid, it is possible to obtain an advantageous effect of stably ensuring the detection stability and accuracy of the liquid level detector and preventing deformation and damage of the temperature sensor 310 that may be caused when the temperature sensor 310 is directly exposed to the cryogenic liquid.

[0082] In addition, according to an embodiment of the present disclosure, the cable 313 electrically connected to the temperature sensor 310 can be arranged along the vacuum space 202 without being directly exposed to the cryogenic liquid. Therefore, it is possible to obtain the advantageous effect of eliminating the need to use a sealant made of a non-metallic material (a sealant for sealing the hole through which the cable passes) and minimizing (blocking) the heat transferred to the storage container 100 (cryogenic liquid) along the cable 313.

[0083] Therefore, it is possible to suppress unnecessary temperature rise and excessive vaporization of the cryogenic liquid (liquid hydrogen) due to heat applied (transferred) from the outside of the storage container 100. Therefore, it is possible to obtain advantageous effects of suppressing excessive pressure rise in the storage container 100, minimizing the amount of hydrogen discharged from the storage container 100 (the amount of loss of discarded hydrogen), and delaying the time point of loss of hydrogen to the maximum (extending the hydrogen loss-free storage period).

[0084] For reference, the cryogenic liquid storage device 10 according to the embodiment of the present disclosure can be used to store various objects that meet the required conditions and design specifications. The present disclosure is not limited or restricted by the type and characteristics of the object.

[0085] For example, the cryogenic liquid storage device 10 according to an embodiment of the present disclosure can be used to store fuel (e.g., liquid hydrogen) used by motor vehicles such as fuel cell electric vehicles (e.g., passenger cars or commercial vehicles), ships, and aircraft that use fuel cell systems.

[0086] The storage container 100 may be provided to store liquid hydrogen (cryogenic liquid hydrogen) used by a fuel cell stack (not shown).

[0087] Hereinafter, an example will be described in which the cryogenic liquid storage apparatus 10 includes only a single storage container 100. According to another embodiment of the present disclosure, the cryogenic liquid storage apparatus may include a plurality of storage containers configured to independently store cryogenic liquid.

[0088] The storage container 100 may have various structures capable of storing liquid hydrogen (eg, at −253° C. based on atmospheric pressure). The present disclosure is not limited or restricted by the type and structure of the storage container 100 .

[0089] Reference Figure 1 According to an exemplary embodiment of the present disclosure, a storage container 100 may include: an inner container 110 having a holding space for holding a cryogenic liquid (e.g., liquid hydrogen); an outer container 120 configured to surround the periphery of the inner container 110; and a vacuum insulation layer 130 defined between the inner container 110 and the outer container 120.

[0090] The inner container 110 and the outer container 120 constituting the storage container 100 may be variously changed in structure and material according to required conditions and design specifications. The present disclosure is not limited or restricted by the structure and material of the inner container 110 and the outer container 120 .

[0091] For example, the inner container 110 may be made of a typical thermally conductive material (eg, metal) having thermal conductivity. According to another embodiment of the present disclosure, the inner container may be made of a multi-layer thin film insulation material (multi-layer insulation material (MLI)) or other materials.

[0092] A vacuum insulation layer 130 for ensuring vacuum insulation (vacuum insulation) may be provided between the inner container 110 and the outer container 120. Therefore, an advantageous effect of sufficiently ensuring insulation performance (low-temperature insulation performance) and minimizing evaporation (vaporization) of liquid hydrogen caused by heat inflow can be obtained.

[0093] Reference Figures 1 to 3 and Figure 7 , the housing member 200 may be disposed in the storage container 100 to define a vacuum space 202 spatially separated from the inner space of the storage container. The vacuum space may be completely separated (isolated) from the cryogenic liquid.

[0094] The housing member 200 may have various structures having the vacuum space 202. The present disclosure is not limited or restricted by the structure and shape of the housing member 200.

[0095] Hereinafter, an example in which the housing member 200 is provided in the form of a straight rod having a length greater than a width will be described. According to another embodiment of the present disclosure, the housing member may have a curved shape or other shapes.

[0096] According to an exemplary embodiment of the present disclosure, the vacuum space 202 may be connected and communicated with the vacuum insulation layer 130 .

[0097] For example, the shell member 200 may include: a shell body 210; a sealing portion 220 configured to seal one end of the shell body 210; and an opening portion 230 disposed at the other end of the shell body 210. The shell member 200 may be disposed in the form of a substantially straight rod with an opening at one end. The opening portion 230 may be connected to the inner port 112 disposed in the inner container 110 and communicate with the vacuum insulation layer 130.

[0098] The end of the housing body 210 directly exposed to (directly immersed in) the cryogenic liquid (based on Figure 1 The lower end of the housing body 210 can be completely sealed by the sealing portion 220, and the other end of the housing body 210 (based on Figure 1 The upper end of the shell body 210 is connected to the vacuum insulation layer 130, so that a vacuum space 202 isolated from the cryogenic liquid can be defined in the shell body 210.

[0099] The housing member 200 may be made of various materials according to required conditions and design specifications. The present disclosure is not limited or restricted by the material of the housing member 200 .

[0100] According to an exemplary embodiment of the present disclosure, the housing member 200 may be made of stainless steel (eg, SUS316L) in consideration of the brittleness of cryogenic liquid (liquid hydrogen).

[0101] For reference, the inner port 112 may have various structures capable of penetrating the inner container 110. The present disclosure is not limited or restricted by the structure and shape of the inner port 112.

[0102] For example, the inner port 112 may penetrate a wall surface (eg, an upper wall surface) of the inner container 110 and have an approximately circular cross-section.

[0103] The housing member 200 may be disposed in the storage container 100 in various postures according to required conditions and design specifications. The present disclosure is not restricted or limited by the posture and position of the housing member 200.

[0104] Hereinafter, the housing member 200 in the gravity direction (based on Figure 1 An example in which the container 110 is vertically arranged in the upward / downward direction).

[0105] According to another embodiment of the present disclosure, the housing member 200 may be disposed to be inclined relative to the gravity direction. The present disclosure is not limited or restricted by the disposition angle (inclination angle relative to the gravity direction) of the housing member 200 relative to the storage container 100 .

[0106] According to an exemplary embodiment of the present disclosure, the cryogenic liquid storage apparatus 10 may include a blocking member 250 configured to block a gap between the other end of the housing body 210 and the inner port 112 .

[0107] The blocking member 250 is configured to stably maintain (seal) the vacuum state of the vacuum insulation layer 130 and the vacuum space 202 and prevent the cryogenic liquid from entering the vacuum space 202 (vacuum insulation layer).

[0108] The blocking member 250 may be made of various materials and has the other end (based on the material) capable of blocking the inner port 112 and the housing body 210. Figure 1 The present disclosure is not limited or restricted by the structure and material of the blocking member 250.

[0109] In particular, since the blocking member 250 may be exposed to the cryogenic liquid, the blocking member 250 may be made of a material other than a non-metallic material (eg, stainless steel) in consideration of the brittleness of the cryogenic liquid (liquid hydrogen).

[0110] For example, refer to Figure 4 , can be at the other end of the housing body 210 (based on Figure 1 The fitting part 252 having a cross-sectional area greater than that of the housing body 210 is integrally provided (for example, fixed by welding) with the housing body 210. The blocking member 250 having a hollow annular shape can be coupled to completely surround the periphery of the gap between the fitting part 252 and the inner port 112 in a state where the fitting part 252 is placed at the upper end of the inner port 112.

[0111] Reference Figures 1 to 3 and Figure 7 The liquid level detector 300 may include a temperature sensor 310 disposed in the vacuum space 202 and in contact with the inner surface of the housing member 200. The liquid level detector 300 is configured to detect the liquid level of the cryogenic liquid based on a signal sensed by the temperature sensor 310.

[0112] The temperature sensor 310 may be configured to sense the temperature of each position (height) on the housing member 200 according to the change of the liquid level of the cryogenic liquid. The temperature sensor 310 may detect the liquid level of the cryogenic liquid based on a signal sensed by the temperature sensor 310.

[0113] That is, the cryogenic liquid in the storage container 100 is divided into liquid (liquid hydrogen) and gas (gas hydrogen). Since the temperatures of the liquid (liquid hydrogen) and the gas (gas hydrogen) are different, the liquid level of the cryogenic liquid can be detected by sensing the temperature of each position (height) on the housing member 200.

[0114] In particular, according to an exemplary embodiment of the present disclosure, the temperature sensor 310 may be provided as a plurality of temperature sensors 310, and the plurality of temperature sensors 310 are arranged in the longitudinal direction of the housing member 200 (based on Figure 1 are spaced apart from each other at a preset interval in the upward / downward direction).

[0115] The number of the temperature sensors 310 and the intervals between the temperature sensors 310 may be variously changed according to required conditions and design specifications. The present disclosure is not limited or restricted by the number of the temperature sensors 310 and the intervals between the temperature sensors 310 .

[0116] The temperature sensor 310 may have various structures capable of measuring the temperature of the housing member 200 that may transfer heat to or receive heat from the cryogenic liquid. The present disclosure is not limited or restricted by the type and structure of the temperature sensor 310 .

[0117] According to an exemplary embodiment of the present disclosure, the temperature sensor 310 may include: a sensing element 312, which is arranged to contact the inner surface of the shell member 200 and is configured to sense the temperature of the cryogenic liquid through the shell member 200; and a sensor substrate 314, which is configured to support the sensing element 312.

[0118] Various temperature sensing elements capable of sensing the temperature of the cryogenic liquid through the housing member 200 may be used as the sensing element 312. The present disclosure is not limited or restricted by the type and characteristics of the temperature sensing element.

[0119] For example, a silicon diode based cryogenic sensing element (eg, DT-670 from Lakeshore) may be used as the sensing element 312 in view of accuracy and precision.

[0120] The sensor substrate 314 may be configured to support the sensing element 312 , and an arrangement state of the sensing element 312 may be stably maintained by the sensor substrate 314 .

[0121] The sensor substrate 314 may have various structures capable of supporting the sensing element 312. The present disclosure is not limited or restricted by the structure and shape of the sensor substrate 314.

[0122] For example, the sensor substrate 314 may be provided in the form of a planar quadrangular substrate. When the sensing element 312 is mounted on the upper surface of the sensor substrate 314, the sensing element 312 may contact the inner surface of the housing member 200. According to another embodiment of the present disclosure, the sensor substrate may have a circular plate shape or other shapes.

[0123] The sensor substrate 314 can be made of various materials according to the required conditions and design specifications. The present disclosure is not limited or restricted by the material of the sensor substrate 314.

[0124] According to an exemplary embodiment of the present disclosure, the sensor substrate 314 may be made of a material capable of minimizing the influence (temperature sensing error) of heat conduction on the sensing element 312. For example, the sensor substrate 314 may be made of a SUS-based metal or a polymer material such as PTFE having low thermal conductivity.

[0125] According to an exemplary embodiment of the present disclosure, the cryogenic liquid storage device 10 may include a support portion 400 configured to support the temperature sensor 310 such that the temperature sensor 310 is in close contact with the inner surface of the housing member 200 in the vacuum space 202 .

[0126] The support portion 400 may be provided so that the temperature sensor 310 is in close contact with the inner surface of the housing member 200 , thereby minimizing an increase in contact thermal resistance between the housing member 200 and the temperature sensor 310 .

[0127] This is based on the fact that when the temperature sensor 310 is not in close contact with the inner surface of the housing member 200 and a gap is generated between the temperature sensor 310 and the housing member 200, the contact thermal resistance increases, which reduces the sensing accuracy of the temperature sensor 310. According to an embodiment of the present disclosure, since the support portion 400 brings the temperature sensor 310 into close contact with the inner surface of the housing member 200, an advantageous effect of stably ensuring the sensing accuracy of the temperature sensor 310 can be obtained.

[0128] The support portion 400 may have various structures that enable the temperature sensor 310 to be in close contact with the inner surface of the housing member 200. The present disclosure is not restricted or limited by the structure of the support portion 400.

[0129] According to an exemplary embodiment of the present disclosure, the support portion 400 may include a spring member 410 configured to elastically support the temperature sensor 310 so that the temperature sensor 310 elastically comes into close contact with the inner surface of the housing member 200 .

[0130] Various springs may be used according to required conditions and design specifications as the spring member 410. The present disclosure is not restricted or limited by the type of the spring member 410. For example, a coil spring made of a SUS-based material having low thermal conductivity may be used as the spring member 410.

[0131] On the other hand, the temperature sensor 310 may be attached to the inner surface of the housing member 200 by an adhesive instead of the spring member 410 .

[0132] However, typical adhesives may harden and damage in low temperature environments, which leads to the problem of increased contact thermal resistance. In addition, since the interior of the housing member 200 is in a vacuum state (vacuum space), the adhesive cannot fully achieve attachment. Therefore, if a gap is generated between the temperature sensor 310 and the housing member 200, the temperature sensor 310 cannot sense the temperature (because heat can only be transferred by conduction in a vacuum space). Therefore, the temperature sensor 310 can be in close contact with the inner surface of the housing member 200 through the elastic force applied by the spring member 410.

[0133] According to an exemplary embodiment of the present disclosure, the cryogenic liquid storage equipment 10 may include a guide plate 420 that is received in the housing member 200 and configured to support the spring member 410 .

[0134] The guide plate 420 may be configured to stably maintain the arrangement state (arrangement interval) of the plurality of temperature sensors 310 and the plurality of spring members 410 and allow the plurality of temperature sensors 310 and the plurality of spring members 410 to smoothly enter the housing member 200 .

[0135] The guide plate 420 may have various structures according to required conditions and design specifications. The present disclosure is not limited or restricted by the structure of the guide plate 420 .

[0136] For example, the guide plate 420 may be provided in the form of a straight plate having a width corresponding to that of the housing member 200 .

[0137] The guide plate 420 may be made of various materials according to required conditions and design specifications. The present disclosure is not limited or restricted by the material of the guide plate 420 .

[0138] According to an exemplary embodiment of the present disclosure, the guide plate 420 may be made of a material having sufficient structural rigidity and low thermal conductivity. For example, the guide plate 420 may be made of a SUS-based metal (eg, SUS304).

[0139] According to an exemplary embodiment of the present disclosure, the spring member 410 may be accommodated in the housing member 200 in a state in which the spring member 410 is supported by the guide plate 420 together with the temperature sensor 310 .

[0140] For example, refer to Figure 5 , a plurality of temperature sensors 310 and a plurality of spring members 410 may be mounted on the upper surface of the guide plate 420, and then the guide plate 420 together with the guide rod 600 may be guided by the guide rod 600 (based on Figure 5 in the downward direction) under compression (based on Figure 5 and inserted into the shell member 200 in the left direction.

[0141] In addition, the state in which the temperature sensor 310 and the spring member 410 are disposed on the guide plate 420 by an adhesive made of an epoxy-based material may be temporarily maintained. Alternatively, the spring member and the temperature sensor may be disposed on the guide plate without using a separate adhesive.

[0142] Next, if Figure 6 As shown, after the guide plate 420 is fully inserted, it is possible (based on Figure 6 The guide rod 600 is withdrawn to the outside of the shell member 200 (in the right direction), so that the temperature sensor 310 can be elastically in close contact with the inner surface of the shell member 200 through the restoring force (elastic force) of the spring member 410.

[0143] According to an exemplary embodiment of the present disclosure, the cryogenic liquid storage equipment 10 may include a heat transfer medium 320 interposed between the temperature sensor 310 and the inner surface of the housing member 200 .

[0144] As described above, according to the embodiment of the present disclosure, the heat transfer medium 320 having high thermal conductivity can be provided between the temperature sensor 310 and the inner surface of the housing member 200. Therefore, the advantageous effects of sufficiently ensuring the thermal contact area between the temperature sensor 310 and the housing member 200 and improving the heat transfer efficiency can be obtained.

[0145] Various media may be used as the heat transfer medium 320 according to the required conditions and specifications. The present disclosure is not limited or restricted by the type and characteristics of the heat transfer medium 320.

[0146] For example, low-temperature vacuum grease (eg, Apiezon-N) may be used as the heat transfer medium 320 .

[0147] For reference, before the temperature sensor 310 and the spring member 410 are inserted into the housing member 200 together with the guide plate 420, the heat transfer medium 320 may be pre-coated on the surface of the temperature sensor 310. After the guide plate 420 is fully inserted into the housing member 200, the guide rod 600 (based on Figure 6 The temperature sensor 310 is withdrawn to the outside of the shell member 200 (in the right direction), so that the temperature sensor 310 can be elastically in close contact with the inner surface of the shell member 200 through the restoring force (elastic force) of the spring member 410, and the part between the temperature sensor 310 and the inner surface of the shell member 200 can be filled with the heat transfer medium 320.

[0148] According to an exemplary embodiment of the present disclosure, the cryogenic liquid storage device 10 may include: an external port 122, which is arranged in the outer container 120; a port cover 124, which is configured to seal the external port 122; and a cable penetration 126, which is arranged in the port cover 124, so that the cable 313 electrically connected to the temperature sensor 310 can pass through the cable penetration 126.

[0149] The outer port 122 may have various structures capable of penetrating the outer container 120. The present disclosure is not limited or restricted by the structure and shape of the outer port 122.

[0150] For example, the outer port 122 may penetrate a wall surface (eg, an upper wall surface) of the outer container 120 corresponding to the inner port 112 and have an approximately circular cross section. In particular, the size of the outer port 122 may allow the housing member 200 to be easily inserted and withdrawn.

[0151] The port cover 124 may be fastened to the outer container 120 to seal the outer port 122. The present disclosure is not limited or restricted by the type and structure of the port cover 124. In particular, a sealing member (not shown) may be provided in the gap between the outer port 122 and the port cover 124.

[0152] The cable penetration 126 may be configured to connect the cable 313 electrically connected to the temperature sensor 310 to a data acquisition system DAQ or a controller disposed outside the storage container 100 .

[0153] Various cable penetrations 126 capable of passing the cable 313 through and maintaining the vacuum state of the vacuum insulation layer 130 (vacuum space) may be used as the cable penetration 126. The present disclosure is not restricted or limited by the type and structure of the cable penetration 126.

[0154] As described above, according to an embodiment of the present disclosure, the cable 313 electrically connected to the temperature sensor 310 can pass through the outer container 120 through the vacuum space 202 and the vacuum insulation layer 130 without being directly exposed to the cryogenic liquid, thereby eliminating the need to provide a separate hole or port through which the cable 313 passes in the inner container 110. Therefore, an advantageous effect of stably maintaining the thermal insulation and sealing properties of the inner container 110 can be obtained.

[0155] In addition, according to an embodiment of the present disclosure, since there is no need to provide a separate hole or port in the inner container 110 for the cable 313 to pass through, it is not necessary to use non-metallic sealing materials (non-metallic sealing materials that are susceptible to low temperature environments) to seal the hole or port.

[0156] Reference Figure 8According to an exemplary embodiment of the present disclosure, the cryogenic liquid storage device 10 may include a protruding shell portion 240 that protrudes from the outer surface of the shell member 200, is integrally formed with the shell member 200, and is configured to define an accommodating space 242 for accommodating a temperature sensor 310.

[0157] The protruding housing portion 240 may be integrally formed with the housing member 200 and define an accommodation space 242 in which the temperature sensor 310 and the spring member 410 are accommodated.

[0158] The protruding housing portion 240 may have various structures capable of defining the accommodation space 242. The present disclosure is not restricted or limited by the structure and shape of the protruding housing portion 240.

[0159] For example, the protruding housing portion 240 may be provided in the form of an approximately quadrangular box. In particular, the protruding housing portion 240 may have a cross-sectional area corresponding to the temperature sensor 310.

[0160] The protruding housing portion 240 may be manufactured in various ways according to required conditions and design specifications. The present disclosure is not limited or restricted by the manufacturing method of the protruding housing portion 240 .

[0161] For example, the protruding housing portion 240 may be integrally formed with the housing member 200 by partially processing (eg, pressing) a portion of the housing member 200. According to another embodiment of the present disclosure, the protruding housing portion may be manufactured separately from the housing member and then integrally connected with the housing member.

[0162] As described above, according to an embodiment of the present disclosure, a plurality of protruding housing portions 240 may be provided on the housing member 200, and the temperature sensor 310 and the spring member 410 may be accommodated in the accommodation space 242 defined in the protruding housing portion 240. Therefore, an advantageous effect of more stably maintaining the arrangement state of the temperature sensor 310 and the spring member 410 may be obtained.

[0163] In addition, a plurality of temperature sensors 310 can be accommodated in the accommodation spaces 242 of different protruding housing portions 240, so that the heat conduction path between adjacent temperature sensors 310 can be further lengthened. Therefore, the advantageous effect of minimizing the influence of heat conduction on adjacent temperature sensors 310 (temperature sensing error) and further improving the sensing stability and reliability of the temperature sensors 310 can be obtained.

[0164] On the other hand, in the embodiment of the present disclosure illustrated and described above, an example is described in which the temperature sensor 310 is in direct contact with the inner surface of the housing member 200. However, according to another embodiment of the present disclosure, the temperature sensor may be in surface contact with the inner surface of the housing member through a thermal conductive member.

[0165] Reference Fig. 9 According to an exemplary embodiment of the present disclosure, the cryogenic liquid storage device 10 may include a thermally conductive member 500 configured to surround the periphery of the temperature sensor 310 and disposed in surface contact with the inner surface of the housing member 200 ′.

[0166] The thermal conductive member 500 may be made of a typical thermal conductive material having thermal conductivity (eg, copper). The present disclosure is not limited or restricted by the material of the thermal conductive member 500 .

[0167] The heat conduction member 500 may have various structures capable of making surface contact with the inner surface of the case member 200 ′. The present disclosure is not restricted or limited by the structure of the heat conduction member 500 .

[0168] For example, the thermally conductive member 500 may have a triangular cross-sectional shape. According to another embodiment of the present disclosure, the thermally conductive member may have a quadrangular cross-sectional shape or other cross-sectional shapes.

[0169] As described above, according to the embodiment of the present disclosure, the temperature sensor 310 can be in contact with the surface of the housing member 200' through the heat-conducting member 500 configured to surround the periphery of the temperature sensor 310, so that the mutual contact area between the temperature sensor 310 and the housing member 200' can be further increased. Therefore, the advantageous effect of further improving the sensing accuracy of the temperature sensor 310 can be obtained.

[0170] Reference Fig. 9 According to an exemplary embodiment of the present disclosure, the cryogenic liquid storage device 10 may include: a first planar contact portion 200a', which is disposed on the inner surface of the shell member 200' and is configured to be in surface contact with one surface of the heat-conducting member 500; and a second planar contact portion 200b', which is disposed on the inner surface of the shell member 200' and is configured to be in surface contact with another surface of the heat-conducting member 500.

[0171] The case member 200 ′ may have various structures having the first planar contact portion 200 a ′ and the second planar contact portion 200 b ′.

[0172] According to an exemplary embodiment of the present disclosure, the shell member 200' may be provided in the form of a straight rod having a triangular cross-sectional shape. The first planar contact portion 200a' may be defined on one side of the inner surface of the shell member 200', and the second planar contact portion 200b' may be defined on the other side of the inner surface of the shell member 200'.

[0173] Hereinafter, an example in which the first planar contact portion 200 a ′ and the second planar contact portion 200 b ′ jointly define an approximate “V” shape will be described.

[0174] As described above, according to the embodiment of the present disclosure, the heat conducting member 500 can be in surface contact with the first planar contact portion 200a' and the second planar contact portion 200b', so that the mutual contact area between the temperature sensor 310 and the housing member 200' can be more fully ensured. Therefore, the advantageous effect of further improving the sensing accuracy of the temperature sensor 310 can be obtained.

[0175] In the embodiment of the present disclosure illustrated and described above, an example in which the housing member 200 ′ includes two planar contact portions is described. However, according to another embodiment of the present disclosure, the housing member may include three or more planar contact portions.

[0176] As described above, according to the embodiments of the present disclosure, it is possible to obtain advantageous effects of accurately detecting the amount of stored cryogenic liquid and improving stability and reliability.

[0177] In particular, according to the present disclosure, it is possible to obtain advantageous effects of accurately measuring the liquid level of the cryogenic liquid and accurately and precisely managing (adjusting) the amount of vaporized cryogenic liquid stored in the storage container and the pressure in the storage container.

[0178] Furthermore, according to the embodiments of the present disclosure, advantageous effects of detecting the liquid level of the cryogenic liquid based on the signal sensed by the temperature sensor, preventing the temperature sensor from being directly exposed to the cryogenic liquid, and minimizing deformation and damage of the temperature sensor can be obtained.

[0179] In addition, according to the embodiments of the present disclosure, an advantageous effect of minimizing the amount of heat transferred from the outside of the storage container to the cryogenic liquid can be obtained.

[0180] In addition, according to the embodiments of the present disclosure, advantageous effects of ensuring durability and safety, minimizing hydrogen loss (hydrogen discharge amount), and delaying the hydrogen loss point to the maximum (extending the hydrogen loss-free storage period) can be obtained.

[0181] In addition, according to the embodiments of the present disclosure, it is possible to obtain advantageous effects of suppressing an excessive increase (expansion) in pressure of a storage container and improving safety and reliability.

[0182] Although the embodiments are described above, these embodiments are illustrative only and are not intended to limit the present disclosure. It will be appreciated by those skilled in the art that various modifications and applications not described above may be made to the present embodiment without departing from the inherent characteristics of the present embodiment. For example, each constituent element specifically described in the embodiment may be modified and then implemented. In addition, it should be explained that the differences associated with the modifications and applications are included within the scope of the present disclosure as defined by the appended claims.

Claims

1. A cryogenic liquid storage device, comprising: Storage containers, containing cryogenic liquids; a housing member disposed in the storage container and defining a vacuum space separated from an inner space of the storage container; as well as A temperature sensor is disposed in the vacuum space and in contact with an inner surface of the housing member, and senses a signal to detect a liquid level of the cryogenic liquid.

2. The cryogenic liquid storage device according to claim 1, wherein: The storage container comprises: an inner container containing the cryogenic liquid; an outer container surrounding the inner container; and A vacuum heat insulating layer is defined between the inner container and the outer container, and the vacuum space communicates with the vacuum heat insulating layer.

3. The cryogenic liquid storage device according to claim 2, wherein: The housing member comprises: Shell body; a sealing portion for sealing one end of the housing body; and An opening is provided at the other end of the housing body, and The opening portion is connected to an inner port provided in the inner container and communicates with the vacuum insulation layer.

4. The cryogenic liquid storage device according to claim 3, further comprising: A blocking member blocks a gap between the other end of the housing body and the inner port.

5. The cryogenic liquid storage device according to claim 1, wherein: The temperature sensor comprises: a sensing element disposed in contact with an inner surface of the housing member and sensing a temperature of the cryogenic liquid through the housing member; and The sensor substrate supports the sensing element.

6. The cryogenic liquid storage device according to claim 1, further comprising: A support portion supports the temperature sensor so that the temperature sensor is in close contact with the inner surface of the housing member in the vacuum space.

7. The cryogenic liquid storage device according to claim 6, wherein: The support portion comprises: The spring member elastically supports the temperature sensor so that the temperature sensor elastically comes into close contact with the inner surface of the housing member.

8. The cryogenic liquid storage device according to claim 7, wherein: The support portion further comprises: A guide plate is accommodated in the housing member and supports the spring member.

9. The cryogenic liquid storage device according to claim 8, wherein: The spring member is supported by the guide plate together with the temperature sensor and is accommodated in the housing member.

10. The cryogenic liquid storage device according to claim 2, further comprising: an external port disposed in the outer container; a port cover, sealing the external port; as well as A cable penetration piece is provided in the port cover so that a cable electrically connected to the temperature sensor passes through the cable penetration piece.

11. The cryogenic liquid storage device according to claim 1, further comprising: A heat transfer medium is interposed between the temperature sensor and the inner surface of the shell member.

12. The cryogenic liquid storage device according to claim 1, wherein: The temperature sensor is provided as a plurality of temperature sensors which are spaced apart from each other in the longitudinal direction of the housing member.

13. The cryogenic liquid storage device according to claim 1, wherein: The housing member is disposed in the direction of gravity.

14. The cryogenic liquid storage device according to claim 1, wherein: The housing member is disposed to be inclined relative to a direction of gravity.

15. The cryogenic liquid storage device according to claim 1, further comprising: The protruding housing portion protrudes from the outer surface of the housing member, is formed integrally with the housing member, and defines an accommodation space for accommodating the temperature sensor.

16. The cryogenic liquid storage device according to claim 1, further comprising: The heat conductive member surrounds the temperature sensor and is disposed in surface contact with the inner surface of the housing member.

17. The cryogenic liquid storage device according to claim 16, further comprising: a first planar contact portion, disposed on the inner surface of the housing member and arranged to be in surface contact with one surface of the heat conducting member; as well as The second planar contact portion is disposed on the inner surface of the housing member and is configured to be in surface contact with the other surface of the heat conducting member.

18. The cryogenic liquid storage device according to claim 16, wherein: The thermally conductive member has a triangular cross-sectional shape.

19. A liquid level measuring device, the liquid level measuring device being used to measure the liquid level of a cryogenic liquid contained in a storage container, the liquid level measuring device comprising: a housing member disposed in the storage container and defining a vacuum space separated from an inner space of the storage container; as well as A temperature sensor is disposed in the vacuum space and in contact with an inner surface of the housing member, and senses a signal to detect a liquid level of the cryogenic liquid.

20. The liquid level measuring device according to claim 19, wherein: The storage container comprises: an inner container containing the cryogenic liquid; an outer container surrounding the inner container; and A vacuum insulation layer is defined between the inner container and the outer container and communicates with the vacuum space.

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