Liquid oxygen low-temperature storage device

Abstract

The utility model relates to the technical field of liquid oxygen storage, and particularly discloses a low-temperature liquid oxygen storage device. Comprising a liner and a shell, a heat insulation cavity is formed between the inner container and the shell and wraps the inner container so that the low-temperature state of the liquid oxygen in the storage process can be guaranteed. A storage cavity is formed in the inner container; the storage chamber is wrapped by the heat insulation cavity to prevent heat transfer; a liquid pipe is arranged at the bottom of the inner container and penetrates through the heat insulation cavity to communicate the storage cavity with the external environment. The liquid pipe and the heat insulation cavity are sealed; the liquid pipe is arranged outside the shell in an extending manner and is communicated with the plurality of pipelines through valves; the interior of the heat insulation cavity is vacuum and is filled with a heat insulation layer; the liquid pipe is further connected with a pipeline assembly, and a supercharger assembly is arranged on the pipeline assembly. One end of the supercharger assembly is communicated with the liquid pipe, and the other end of the supercharger assembly is provided with a pressure regulating valve. The memory can meet different storage requirements without replacing equipment, and is more convenient and flexible to use.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid oxygen storage, in particular to a liquid oxygen low-temperature storage device. Background Art

[0002] Liquid oxygen cryogenic storage tanks, also known as liquid oxygen cryogenic storage tanks or cryogenic liquid oxygen tanks, are devices specifically designed for storing liquid oxygen. These devices fall under the category of pressure storage vessels and are primarily used to store liquid oxygen (LOX). They are widely used in various industries, including steel mills, hospitals, the food and beverage industry, and welding. As a crucial industrial equipment, liquid oxygen cryogenic storage tanks not only have a wide range of applications but also possess remarkable technical advantages. These advantages ensure the safe storage and efficient use of liquid oxygen, playing a vital role in various industries. Specifically, liquid oxygen cryogenic storage tanks are designed and manufactured to strict safety standards to ensure stable operation even in extremely low temperature conditions. Their specially designed internal structure effectively prevents leakage or volatilization of liquid oxygen during storage. Furthermore, liquid oxygen cryogenic storage tanks are typically equipped with advanced temperature control systems to maintain a low temperature environment, thereby ensuring the stability and purity of the liquid oxygen. These technical advantages enable liquid oxygen cryogenic storage tanks to reliably provide a stable supply of liquid oxygen across various industries, meeting the needs of various industrial production processes.

[0003] The patent "A New Type of Low-Temperature Liquid Oxygen Normal-Pressure Storage Tank" (publication number CN215569724U, hereinafter referred to as prior art 1) discloses a normal-pressure liquid oxygen storage tank. In prior art 1, a pressure regulating pump, a positioning sleeve, a reinforcing hoop and a lower side support are provided to ensure the stability of the liquid oxygen storage tank during movement, thereby improving the use effect of the liquid oxygen storage tank. At the same time, a storage cavity is also provided inside the storage tank. A column is fixedly installed on one side of the liquid oxygen storage tank above the base, and a uniformly distributed positioning sleeve is fixedly installed on the outer surface of the column. The positioning sleeve is movably connected to a reinforcing hoop at one end close to the liquid oxygen storage tank, and the reinforcing hoop is fixedly provided on the outer surface of the liquid oxygen storage tank. In addition, a vacuum cavity is provided on the outside of the storage cavity, and a thermal insulation material layer is provided on the outside of the vacuum cavity to realize normal-pressure storage of liquid oxygen.

[0004] Although this arrangement in Prior Art 1 enables liquid oxygen storage, its primary limitation is that it can only be stored at atmospheric pressure. It cannot store liquid oxygen under pressure, and thus cannot flexibly switch between pressurized and atmospheric pressures. This single storage method is clearly inconvenient and lacks flexibility, failing to meet the needs of diverse application scenarios. Utility Model Content

[0005] In view of this, an embodiment of the present invention provides a liquid oxygen cryogenic storage device to solve the problem of single storage method and lack of flexibility of liquid oxygen in the prior art.

[0006] An embodiment of the present invention provides a liquid oxygen low-temperature storage device, comprising an inner liner and an outer shell that wraps the inner liner; an insulating cavity is provided between the inner liner and the outer shell, the insulating cavity wraps the inner liner and is sealed to ensure that the liquid oxygen is in a low-temperature state during storage; the inner hollow interior of the inner liner forms a storage chamber for accommodating liquid oxygen; the storage chamber is wrapped by the insulating cavity to prevent heat transfer; a liquid pipe is provided at the bottom of the inner liner, the liquid pipe passes through the insulating cavity to connect the storage chamber with the external environment; the liquid pipe and the insulating cavity are sealed; the liquid pipe extends to the outside of the outer shell and is connected to multiple pipelines through a valve; the interior of the insulating cavity is vacuum-set and filled with an insulating layer; a pipeline assembly is also connected to the liquid pipe, and a booster assembly is provided on the pipeline assembly; one end of the booster assembly is connected to the liquid pipe, and the other end is provided with a pressure regulating valve.

[0007] Preferably, the liquid pipe is connected to a pipeline assembly; a gas phase port, a liquid level port, a vent port and a liquid inlet and outlet are provided through the pipeline assembly; the gas phase port and the liquid level port are provided on the supercharger assembly; the inner tank, liquid pipe and pipeline assembly are all made of austenitic stainless steel.

[0008] Preferably, the shell is made of Q235 material; the insulation cavity between the inner liner and the shell is filled with perlite as an insulation layer, or a coating material is used as an insulation layer to block heat conduction, and the insulation cavity is vacuum treated.

[0009] Preferably, the heat-insulating cavity is provided with a vacuum port; the vacuum port is provided at the top of the shell, and the vacuum port is connected to the heat-insulating cavity through the vacuum pipe.

[0010] Preferably, the vacuum degree of the insulation cavity should be maintained above 13.3 Pa. When the vacuum degree of the insulation cavity drops below 13.3 Pa, the insulation cavity is re-evacuated.

[0011] Preferably, the insulation cavity is also provided with a pressure relief port; the pressure relief port is connected to the inner tank via a pressure relief pipe passing through the insulation cavity; the maximum working pressure of the inner tank is 0.76MPa; when the maximum working pressure of the inner tank is close to 0.76MPa, the pressure relief port is opened for pressure reduction regulation.

[0012] Preferably, a liquid level gauge is further provided on the outer shell; the liquid level gauge is connected to the liquid level port and feeds back the liquid level through the liquid oxygen capacity in the inner tank.

[0013] Preferably, the liquid pipe is connected to the pipeline assembly through a low-temperature stop valve.

[0014] Preferably, a vacuum unit is provided on the shell, and the vacuum unit includes a vacuum pipe. The vacuum pipe passes through the shell and the insulation cavity and is connected with the vacuum space inside the insulation cavity, so that the insulation cavity maintains a vacuum state.

[0015] Preferably, the pipeline assembly is configured to place a small amount of liquid in the pipeline and blow away dust in the pipeline through the medium gas.

[0016] The liquid oxygen cryogenic storage device provided by the utility model has the following beneficial effects:

[0017] The insulation cavity between the inner liner and the outer shell of the liquid oxygen cryogenic storage is set to a vacuum structure and filled with an insulation layer, which can greatly reduce heat conduction and convection, greatly improve the thermal insulation performance, and ensure the stable storage of liquid oxygen at low temperatures. The set booster assembly can adjust the internal pressure of the storage through the pressure regulating valve to achieve pressurized storage, which is suitable for scenarios that require stable pressure oxygen supply. At the same time, the booster can also be turned off to achieve normal pressure storage to meet different application requirements. The pressure regulating valve flexibly controls the booster assembly and can flexibly switch between pressurized and normal pressure. Different storage requirements can be met without replacing equipment, making it more convenient and flexible to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work, and these are all within the scope of protection of the present invention.

[0019] Figure 1 It is a partial cross-sectional schematic diagram of a liquid oxygen cryogenic storage device;

[0020] Figure 2 It is a schematic diagram of the cross-sectional structure of a liquid oxygen cryogenic storage device;

[0021] Figure 3 It is a schematic diagram of a piping assembly of a liquid oxygen cryogenic storage device;

[0022] Parts and numbers in the picture:

[0023] 100- liner, 110- storage chamber, 120- liquid pipe, 130- low temperature stop valve;

[0024] 200-housing;

[0025] 300-insulation cavity, 310-insulation layer, 321-vacuum port, 322-vacuum pipe, 331-pressure relief port, 332-pressure relief pipe,

[0026] 400-pipeline assembly, 410-gas phase port, 420-liquid level port, 430-vent port, 440-liquid inlet and outlet, 450-booster assembly, 460-pressure regulating valve;

[0027] 500-Support components. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. Moreover, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, elements defined by the phrase "comprises..." do not exclude the presence of additional identical elements in the process, method, article, or device that includes the elements. If there is no conflict, the embodiments of the present invention and the various features therein may be combined with each other and are all within the scope of protection of the present invention.

[0029] Example 1

[0030] See Figure 1 The embodiment of the present invention provides a liquid oxygen cryogenic storage device, which mainly includes two main parts: an inner liner 100 and an outer shell 200. The main function of the inner liner 100 is to store liquid oxygen and ensure that the liquid oxygen is preserved in a safe environment. The outer shell 200 plays a dual role. On the one hand, it wraps the inner liner 100, providing physical protection for the inner liner 100 to prevent external impact and collision from causing damage to the inner liner 100; on the other hand, the outer shell 200 also has a heat insulation function. Through its own structure and material properties, it first isolates a part of the external heat, thereby reducing the heat load on the inner liner 100.

[0031] To improve the thermal insulation effect, an interlayer is provided between the inner liner 100 and the outer shell 200 for placing an insulation layer 310. In this way, the insulation layer 310 in the interlayer can effectively block the transfer of external heat, further reducing the evaporation or temperature rise of the liquid oxygen in the inner liner 100 due to changes in external temperature. In this way, the liquid oxygen can be stored for a long time in a relatively stable low-temperature environment, ensuring its quality and performance. This embodiment uses multi-layered insulation measures to protect the inner liner 100 from physical damage and effectively reduce heat transfer, thereby achieving long-term storage of liquid oxygen.

[0032] See Figure 1 An insulating cavity 300 is located within the cavity between the inner liner 100 and the outer shell 200. This insulating cavity 300 not only completely encloses the inner liner 100 but is also sealed, ensuring that the liquid oxygen remains at a low temperature during storage. This sealed insulating cavity 300 design effectively prevents the transfer of external heat, further improving the stability and safety of liquid oxygen storage.

[0033] The interior of the liner 100 is configured as a hollow structure, thereby forming a storage chamber 110 specifically for storing liquid oxygen; this storage chamber 110 is tightly wrapped by a layer of high-efficiency heat insulation chamber 300 to effectively prevent the transfer and penetration of external heat, so that the liquid oxygen stored in the storage chamber can maintain a low temperature state.

[0034] A liquid pipe is installed at the bottom of the inner liner 100. The liquid pipe needs to pass through the insulation cavity 300 to achieve communication between the storage chamber 110 and the external environment. Specifically, the main function of this liquid pipe is to ensure a smooth connection between the inner liner 100 and the external environment to facilitate necessary operations, such as the input or output of liquid oxygen. In this way, the liquid pipe not only ensures that the liquid substance inside the inner liner 100 can be effectively exchanged with the external environment, but also ensures the sealing and safety of the entire system.

[0035] See Figure 2, a sealing treatment is carried out between the liquid pipe and the insulation cavity 300 to ensure that there is no leakage between the two, thereby ensuring the stability and safety of the low-temperature storage of the entire system. This sealing treatment can not only prevent the liquid from leaking inside the liquid pipe, but also prevent the heat in the external environment from entering the liquid pipe through the insulation cavity 300, thereby ensuring that the liquid inside the liquid pipe is maintained at the optimal working temperature. In addition, the liquid pipe is also extended to the outside of the outer shell 200 to facilitate various operations and maintenance. This arrangement makes the length of the liquid pipe more flexible and can be adjusted according to actual needs to meet the needs of different application scenarios. At the same time, the liquid pipe is connected to multiple pipes through a valve, so that the liquid can flow freely between the pipes, thereby realizing efficient transmission and distribution of the liquid.

[0036] See Figure 2 The interior of the insulation chamber 300 is set to a vacuum environment and filled with a material with excellent thermal insulation properties. At the same time, the outer shell 200 is equipped with a vacuum unit specifically for maintaining the vacuum state. This vacuum unit primarily comprises a vacuum tube 322, which passes through the outer shell 200 and the insulation chamber 300 and directly communicates with the vacuum space within the insulation chamber 300. In this way, the vacuum tube 322 can effectively evacuate the air within the insulation chamber 300, thereby ensuring that the insulation chamber 300 can be continuously maintained in a vacuum state, thereby achieving its optimal thermal insulation effect.

[0037] In this embodiment, the liquid pipe is connected to the pipeline assembly 400 through a connecting device. Through this pipeline assembly 400, multiple functional interfaces are set, including a gas phase port 410, a liquid level port 420, a vent port 430, and a liquid inlet and outlet port 440. These interfaces are used to achieve different functions.

[0038] The gas phase port 410 is used to discharge or recover gas from the top of the storage. A small amount of gas may be generated during the storage of liquid oxygen. The gas phase port 410 can be used to discharge this gas through a pipeline to avoid overpressure, or to adjust the pressure inside the storage. During the storage of liquid oxygen, the liquid level can be monitored in real time, so that the operator can accurately understand the current amount of liquid oxygen used or the amount that needs to be added, so as to replenish or adjust it in time. This not only effectively avoids the problem of insufficient or excessive liquid oxygen storage, but also ensures the safe operation of the entire storage system. The gas phase port 410 is connected to the top of the inner liner 100 through a pipeline.

[0039] By monitoring the liquid level port 420, precise control of the liquid oxygen inventory can be achieved, thereby ensuring the safety of liquid oxygen storage and ensuring the stability and reliability of the entire system. The vent port 430 is used to discharge internal gas, releasing excess gas inside the storage or oxygen generated by the vaporization of liquid oxygen, so that it can be vented before operation or maintenance to ensure that the pressure in the storage tank is not too high and to ensure the safety of operation. The liquid inlet and outlet port 440 serves as the main inlet and outlet of liquid oxygen and is used for filling and transporting liquid oxygen. The liquid inlet and outlet port 440 can conveniently add liquid oxygen to the storage or transport it from the storage to other equipment through this interface.

[0040] In order to ensure the corrosion resistance of the entire system, the exterior of the housing 200 may be painted, and the anti-corrosion performance of the tank body may be improved by the anti-corrosion paint.

[0041] Furthermore, the inner liner 100, liquid pipe, and piping assembly 400 are all made of austenitic stainless steel. Due to its excellent corrosion resistance and high strength, austenitic stainless steel is widely used in various industrial fields, particularly in applications requiring high cleanliness and corrosion resistance. This material ensures the reliability and service life of the inner liner 100 and various piping systems, while also facilitating maintenance and cleaning.

[0042] In this embodiment, the shell 200 is made of Q235 material. Q235 is a high-quality carbon structural steel widely used in the industrial field, and belongs to the common low-carbon steel material specified in the Chinese national standard GB / T 700. The main components of Q235 are iron and a small amount of carbon, and usually contain a small amount of manganese, silicon, phosphorus, sulfur and other elements. Its chemical composition is relatively strictly controlled, and it has good plasticity, toughness and weldability, and can withstand certain pressure and impact. The choice of this material ensures that the shell 200 is sturdy and durable, and also has a certain corrosion resistance, so that it can maintain stable performance in various environments. The yield strength of Q235 is ≥235MPa, the tensile strength is 370-500MPa, and the elongation is ≥26% (when the thickness is less than 16mm).

[0043] For further information, see Figure 2 An insulating cavity 300 is provided between the inner liner 100 and the outer shell 200 for heat preservation. This insulating cavity 300 primarily blocks heat transfer between the inner and outer shells, thereby maintaining a stable temperature within the inner liner 100. To achieve optimal insulation, the insulating cavity 300 is filled with perlite as an insulating layer 310. Perlite is a naturally porous mineral with extremely low thermal conductivity, effectively preventing heat transfer through conduction. Furthermore, perlite is lightweight, environmentally friendly, and heat-resistant.

[0044] To further enhance the thermal insulation effect, the thermal insulation chamber 300 may also utilize a coating material as a thermal insulation layer 310. This coating material has excellent thermal insulation properties and can effectively block heat conduction. The coating material 310 may be a variety of high-performance thermal insulation materials, such as ceramic fiber and glass fiber. These materials maintain excellent thermal insulation properties in both high and low temperature environments.

[0045] Furthermore, in order to ensure that the thermal insulation effect of the thermal insulation cavity 300 is optimal, the thermal insulation cavity 300 has been subjected to a vacuum treatment. Vacuum treatment refers to the formation of a vacuum state inside the thermal insulation cavity 300. Since there are almost no gas molecules in a vacuum environment, heat cannot be transferred through convection and conduction of gas molecules. In this way, the thermal insulation effect of the thermal insulation cavity 300 is significantly improved, and the temperature inside the inner liner 100 can be more effectively maintained stable, thereby ensuring the thermal insulation performance of the entire storage device. Through this vacuum treatment, the thermal insulation performance of the thermal insulation cavity 300 is further optimized, so that it can maintain an excellent thermal insulation effect on the inner liner 100 even under low temperature conditions.

[0046] In the insulation cavity 300, an interface for vacuuming is also provided; this vacuum port 321 is provided at the upper end of the shell 200. In order to ensure the smooth progress of the vacuuming process, the vacuum port 321 is connected to the interior of the insulation cavity 300 through a special vacuum tube 322. In this way, through the coordinated use of the vacuum port 321 and the vacuum tube 322, the air inside the insulation cavity 300 can be effectively extracted, thereby achieving the purpose of reducing the internal pressure of the insulation cavity 300 and improving its thermal insulation performance. After the vacuuming is completed, the vacuum port 321 is sealed to isolate it from the outside.

[0047] The vacuum degree of the insulation cavity 300 should be maintained at a level of 13.3Pa (equivalent to 0.1Torr) or higher to ensure its good thermal insulation performance. When it is detected that the vacuum degree of the insulation cavity 300 drops below 13.3Pa, measures must be taken immediately to re-vacuum the insulation cavity 300 to restore its proper thermal insulation effect. In a vacuum environment, heat transfer mainly depends on the collision of gas molecules. When the vacuum degree drops below 13.3Pa, it means that there is a certain degree of leakage or gas penetration. As the vacuum degree decreases, the number of gas molecules in the container increases and the thermal conductivity increases accordingly. This will cause external heat to be more easily transferred to the storage medium (such as liquid oxygen) through the gas, thereby affecting the thermal insulation effect. Below 13.3Pa, the presence of gas will cause significant heat transfer, reducing the thermal insulation effect, so it needs to be re-vacuumed.

[0048] See Figure 1In the structure of the insulation cavity 300, a safety device, a pressure relief port 331, is also provided. These pressure relief ports 331 extend through the insulation cavity 300 to the interior of the inner liner 100 via a pressure relief pipe 332, ensuring connectivity between the inside and the outside. This design enables the inner liner 100 to effectively regulate pressure when it is subjected to pressure changes. Specifically, the maximum working pressure of the inner liner 100 is set to 0.76MPa, which is a safety threshold to ensure that the equipment will not be in danger due to excessive pressure during normal operation.

[0049] In order to further ensure the safety of the system, when the pressure in the inner tank 100 approaches the maximum working pressure, that is, 0.76MPa, the pressure relief port 331 will automatically open. This action will start the pressure reduction regulation mechanism, thereby quickly releasing excess gas or steam to maintain the pressure within a safe range. This automated pressure relief mechanism not only improves the reliability of the system, but also reduces the need for human intervention, ensuring the long-term stable operation of the equipment. In this way, the pressure relief port 331 and the pressure relief pipe 332 together constitute an effective pressure regulation system, which ensures the safety and stability of the inner tank 100 and the storage device under various working conditions.

[0050] A liquid level gauge is mounted on the housing 200. This level gauge, connected to the liquid level port 420 on the housing 200, monitors and provides real-time feedback on the liquid oxygen content in the inner tank 100, providing accurate liquid level information. This level gauge allows users to monitor the liquid oxygen storage status at all times, ensuring the proper operation of the device.

[0051] Furthermore, the liquid pipe is connected to the piping assembly 400 via a cryogenic shut-off valve 130. This valve is designed to ensure the tightness and safety of the liquid pipe in low-temperature environments, preventing liquid oxygen leakage and ensuring stable equipment operation. The inclusion of this valve enhances the reliability of the entire system and improves the safety of the equipment.

[0052] See Figure 1 and Figure 3 The pipeline assembly 400 is equipped with a booster assembly 450. One end of the booster assembly 450 is connected to the liquid pipe, ensuring smooth passage of liquid oxygen. The other end of the booster assembly 450 is equipped with a pressure regulating valve 460. By adjusting the pressure, it can effectively control the output pressure of the liquid oxygen and ensure stable operation of the system. The gas phase port 410 and the liquid level port 420 are also provided on the pipeline of the booster assembly 450.

[0053] In cryogenic liquid oxygen storage applications, boosters typically take the form of pumps. Booster pumps are specifically designed to increase the pressure of liquids or gases, ensuring that liquid oxygen can be transported or stored within the required pressure range, enabling pressurized or atmospheric storage. For example, in this embodiment, a CP-VS1 / VS6 series vertical suspended pump is used as a booster component. These pumps are suitable for cryogenic engineering, capable of handling liquids ranging from clean to corrosive, and exhibit excellent cavitation resistance. Furthermore, they comply with API 610 and ISO 13709 standards, emphasize hydraulic structure and mechanical seals, and are suitable for stable operation in cryogenic environments.

[0054] To ensure cleanliness within the pipeline, the pipeline assembly 400 undergoes pipeline cleaning before use. Specifically, a small amount of liquid is placed into the pipeline, and then dust and impurities are blown out with a medium gas. This process ensures internal cleanliness of the pipeline, preventing blockage or damage caused by dust and impurities, thereby improving the operating efficiency and service life of the equipment.

[0055] In the process of storing liquid oxygen, two different methods can be selected: normal pressure storage or pressurized storage. No matter which storage method is chosen, the key is to ensure that the main valve of the booster assembly 450 is in a closed state. Pressurized storage has its unique advantages. It can significantly reduce the evaporation loss of the storage medium, thereby improving storage efficiency. In addition, pressurized storage can effectively shorten the time for the next liquid extraction, so it is considered to be a more economical storage method. However, during pressurized storage, it is necessary to ensure that the pressure gauge is in normal working condition so that pressure changes can be monitored in real time. Due to the large temperature difference between the inside and outside of the storage device, the storage device will naturally increase pressure. Therefore, during pressurized storage, special attention must be paid to the changes in the pressure in the tank. In order to ensure safety, it is necessary to perform pressure relief or venting operations in a timely manner to prevent safety hazards caused by excessive pressure.

[0056] Furthermore, in order to fix the inner liner 100 , a supporting component 500 is provided between the inner liner 100 and the outer shell 200 , and the inner liner 100 is fixed to the outer shell 200 through the supporting component 500 .

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liquid oxygen cryogenic storage device, characterized in that: The invention comprises an inner liner (100) and an outer shell (200) enclosing the inner liner (100); a heat-insulating cavity (300) is provided between the inner liner (100) and the outer shell (200); the heat-insulating cavity (300) encloses the inner liner (100) and is sealed to ensure that the liquid oxygen is kept in a low-temperature state during storage; The inner hollow portion of the inner liner (100) is provided to form a storage chamber (110) for accommodating liquid oxygen; the storage chamber (110) is wrapped by the heat-insulating chamber (300) to prevent heat transfer; a liquid pipe (120) is provided at the bottom of the inner liner (100), and the liquid pipe (120) passes through the heat-insulating chamber (300) to connect the storage chamber (110) with the external environment; a sealing treatment is performed between the liquid pipe (120) and the heat-insulating chamber (300); The liquid pipe (120) is extended outside the shell (200) and is connected to a plurality of pipes through a valve; the interior of the heat-insulating cavity (300) is vacuum-set and filled with a heat-insulating layer (310); a pipeline assembly (400) is further connected to the liquid pipe (120), and a booster assembly (450) is provided on the pipeline assembly (400); one end of the booster assembly (450) is connected to the liquid pipe (120), and the other end is provided with a pressure regulating valve (460).

2. The liquid oxygen cryogenic storage device according to claim 1, characterized in that: The liquid pipe (120) is provided with a gas phase port (410), a liquid level port (420), a vent port (430), and a liquid inlet and outlet port (440) through the pipeline assembly (400); the gas phase port (410) and the liquid level port (420) are provided on the supercharger assembly (450); the inner liner (100), the liquid pipe (120), and the pipeline assembly (400) are all made of austenitic stainless steel.

3. The liquid oxygen cryogenic storage device according to claim 2, characterized in that: The outer shell (200) is made of Q235 material; at the same time, perlite is filled between the inner liner (100) and the outer shell (200) as an insulation cavity (300), or a coating material is used to block heat conduction, and the insulation cavity (300) has been vacuum treated.

4. The liquid oxygen cryogenic storage device according to claim 1, wherein: The heat-insulating cavity (300) is provided with a vacuum port (321); the vacuum port (321) is provided at the top of the housing (200), and the vacuum port (321) is communicated with the heat-insulating cavity (300) via a vacuum pipe (322).

5. The liquid oxygen cryogenic storage device according to claim 4, characterized in that: The vacuum degree of the heat-insulating cavity (300) should be maintained above 13.3 Pa. When the vacuum degree of the heat-insulating cavity (300) drops below 13.3 Pa, the heat-insulating cavity (300) is re-evacuated.

6. The liquid oxygen cryogenic storage device according to claim 5, characterized in that: The heat-insulating cavity (300) is further provided with a pressure relief port (331); the pressure relief port (331) passes through the heat-insulating cavity (300) and is in communication with the inner liner (100) via a pressure relief pipe (332); the maximum working pressure of the inner liner (100) is 0.76 MPa; when the maximum working pressure of the inner liner (100) approaches 0.76 MPa, the pressure relief port (331) is opened to perform pressure reduction regulation.

7. The liquid oxygen cryogenic storage device according to claim 2, characterized in that: A liquid level gauge is also provided on the housing (200); the liquid level gauge is connected to the liquid level port (420) and feeds back the liquid level through the liquid oxygen capacity in the inner tank (100).

8. The liquid oxygen cryogenic storage device according to claim 2, characterized in that: The liquid pipe (120) is connected to the pipeline assembly (400) via a low-temperature stop valve (130).

9. The liquid oxygen cryogenic storage device according to claim 1, characterized in that: A vacuum unit is provided on the housing (200), and the vacuum unit includes a vacuum pipe (322). The vacuum pipe (322) passes through the housing (200) and the insulation cavity (300) and is connected to the vacuum space inside the insulation cavity (300), so that the insulation cavity (300) maintains a vacuum state.

10. The liquid oxygen cryogenic storage device according to claim 9, characterized in that: The pipeline assembly (400) is configured to place a small amount of liquid in the pipeline and to blow away dust in the pipeline using a medium gas.

Images