Cryogenic container

Abstract

The utility model provides a low-temperature container which comprises an outer shell, an inner shell, a liquid guide pipe, a liquid collector and an air return pipe. The liquid guide pipe is provided with two opposite ends, the two ends of the liquid guide pipe are the liquid inlet end and the liquid outlet end respectively, the liquid inlet end is located in the containing cavity, the liquid outlet end sequentially penetrates through the inner shell and the outer shell to extend out of the outer shell, the liquid outlet end is lower than the liquid inlet end in the vertical direction, and a medium at the preset liquid level in the containing cavity can flow from the liquid inlet end to the liquid outlet end through the gravity of the medium. The liquid collector is arranged outside the outer shell and communicated with the liquid outlet end of the liquid guide pipe so as to collect the medium flowing out of the containing cavity through the liquid guide pipe. One end of the gas return pipe is communicated with the liquid collector, and the other end of the gas return pipe is communicated with the part, above the preset liquid level, in the containing cavity and used for enabling gas formed after medium vaporization to flow back into the containing cavity. According to the low-temperature container, the medium filling process can be monitored more safely, and environmental pollution caused by medium discharging is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to low temperature medium storage and transportation technical field, especially in low temperature container. BACKGROUND

[0002] The low temperature container is mainly used for storing liquefied natural gas, liquid oxygen and other frozen liquefied medium below-100 DEG C, and usually adopts double-layer vacuum insulation structure. The interlayer space of the inner shell and the outer shell needs to maintain high vacuum degree to ensure the insulation performance. The upper limit of liquid level needs to be accurately controlled during the filling process to avoid overfilling, which may cause the inner shell to expand and deform, vacuum failure or abnormal pressure rise and other safety hazards.

[0003] During the filling operation, the traditional liquid level meter is easily interfered by frosting and gas-liquid phase change due to the limitation of the container sealing structure and the characteristics of the low temperature medium, and it is difficult to realize real-time and accurate monitoring of the liquid level. The operator needs to rely on experience to predict the filling progress, which may easily lead to overfilling risk.

[0004] In the prior art, to prevent overfilling, an overflow pipe is arranged in the inner shell, and the overflow pipe is led out to the outside of the outer shell. An overflow valve is arranged on the overflow pipe. When the predicted liquid level reaches the filling liquid level, the overflow valve outside is opened. The medium flows out through the overflow pipe and the overflow valve. The filling condition of the medium in the container is judged by observing the outflowing medium. However, when the overflow valve is opened, the inside of the container is connected with the atmosphere regardless of whether the medium reaches the filling liquid level or not, which causes the medium to be discharged, resulting in medium loss and environmental pollution. In addition, the medium is very low in temperature, and when it is sprayed out of the overflow valve, it is easy to cause harm to personnel and cause safety accidents. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a low temperature container, which can more safely monitor the medium filling process and avoid environmental pollution caused by medium discharge.

[0006] To solve the above technical problems, the utility model provides a low temperature container, which comprises:

[0007] An outer shell;

[0008] An inner shell is arranged in the outer shell in a spaced manner. The inner shell is internally provided with a hollow container cavity. The container cavity is used for accommodating the medium.

[0009] A liquid guide pipe has two opposite ends. The two ends of the liquid guide pipe are a liquid inlet end and a liquid outlet end, respectively. The liquid inlet end is located in the container cavity and is flush with the preset liquid level of the container cavity. The liquid outlet end sequentially penetrates the inner shell and the outer shell to the outside of the outer shell. The liquid outlet end is vertically lower than the liquid inlet end. The medium at the preset liquid level in the container cavity can flow from the liquid inlet end to the liquid outlet end by relying on its own gravity.

[0010] A liquid collector is arranged outside the outer shell and is in communication with the liquid outlet end of the liquid guide pipe to collect the medium flowing out of the container cavity through the liquid guide pipe;

[0011] A gas return pipe is in communication with the liquid collector at one end and is in communication with the portion above the preset liquid level in the container cavity at the other end to return the gas formed after the medium vaporization to the container cavity.

[0012] In an exemplary embodiment of the present disclosure, the liquid guide pipe comprises a liquid inlet pipe, a sandwich pipe and a liquid outlet pipe connected in sequence, the liquid inlet pipe is arranged in the container cavity, the sandwich pipe is arranged in the sandwich space between the inner shell and the outer shell, the liquid outlet pipe is arranged outside the outer shell, one end of the liquid inlet pipe away from the sandwich pipe forms the liquid inlet end, and one end of the liquid outlet pipe away from the sandwich pipe forms the liquid outlet end.

[0013] The outer surface of the sandwich pipe is covered with a heat insulation layer to form a heat insulation pipe.

[0014] In an exemplary embodiment of the present disclosure, the sandwich pipe comprises a first pipe segment, an upwardly inclined pipe segment and a downwardly extended pipe segment connected in sequence, the first pipe segment is connected to the liquid inlet pipe, the upwardly inclined pipe segment is inclined upwardly and has a low end and a high end, the low end is connected to the first pipe segment, the high end is connected to the downwardly extended pipe segment, one end of the downwardly extended pipe segment is connected to the high end, and the other end extends downwardly.

[0015] The sandwich pipe comprises a connecting pipe segment arranged at the bottom end of the downwardly extended pipe segment, the connecting pipe segment extends in the horizontal direction and is connected to the liquid outlet pipe.

[0016] The liquid outlet pipe is provided with a first valve for controlling the opening and closing of the liquid outlet pipe.

[0017] In an exemplary embodiment of the present disclosure, the liquid outlet pipe comprises a second pipe segment and a third pipe segment, the second pipe segment extends in the vertical direction, the third pipe segment extends in the horizontal direction, and the third pipe segment is connected to the bottom end of the second pipe segment.

[0018] The gas return pipe is provided with a second valve for controlling the opening and closing of the gas return pipe, and the second valve is located outside the outer shell.

[0019] In an exemplary embodiment of the present disclosure, the inner shell is provided with a mounting hole in the peripheral wall.

[0020] The low-temperature container further comprises a mating head mounted in the mounting hole, the mating head is provided with a mounting channel in the axial direction of the mounting hole, and the liquid inlet pipe and the sandwich pipe respectively extend into the mounting channel and are in abutting communication.

[0021] In an exemplary embodiment of the present disclosure, the low-temperature container further comprises a liquid collecting connector, the liquid collecting connector having a top-opened liquid collecting cavity, a cross-sectional area of the liquid collecting cavity gradually decreasing in a direction from a top to a bottom of the liquid collecting cavity, the liquid inlet end being connected to the bottom of the liquid collecting connector and communicating with the bottom of the liquid collecting cavity, and a top surface of the liquid collecting connector being flush with the preset liquid level.

[0022] In an exemplary embodiment of the present disclosure, the low-temperature container further comprises a mounting bracket fixed to an inner wall of the inner shell, the mounting bracket being fixedly connected with the liquid collecting connector.

[0023] In an exemplary embodiment of the present disclosure, the peripheral wall of the outer shell is provided with a first through hole.

[0024] The low-temperature container comprises an insulation device, the insulation device being arranged on the peripheral wall of the outer shell and covering the first through hole, the insulation device being provided with a second through hole, the liquid outlet end of the liquid guide pipe sequentially passing out of the first through hole and the second through hole to the outside of the outer shell, the liquid guide pipe having a spacing with the hole wall of the first through hole and being connected with the hole wall of the second through hole.

[0025] In an exemplary embodiment of the present disclosure, the low-temperature container further comprises a temperature sensor, the temperature sensor being arranged on the liquid collector and used for detecting a temperature in the liquid collector.

[0026] In an exemplary embodiment of the present disclosure, the low-temperature container further comprises a filling pipeline, a filling valve and a control system, the filling pipeline being in communication with the container cavity and used for filling a medium into the container cavity, the filling valve being located outside the outer shell and arranged on the filling pipeline and used for controlling opening and closing of the filling pipeline, and the control system being connected with the temperature sensor and the filling valve and used for controlling opening and closing of the filling valve according to a measured value of the temperature sensor.

[0027] According to the above technical solution, the low-temperature container has the following advantages:

[0028] In the present application, the liquid inlet end of the liquid guide pipe is flush with the preset liquid level by arranging the liquid guide pipe, the liquid collector and the gas return pipe, so that when the medium filling reaches the preset liquid level, the medium can flow to the liquid collector arranged outside by using its own gravity, the filling condition of the medium in the container cavity can be determined by observing the frosting condition of the surface of the liquid collector, and the gas formed after the medium vaporizes under the external environment is returned to the container cavity through the gas return pipe, so that the medium is prevented from being discharged, thereby improving the safety of the monitoring process and preventing the medium from polluting the environment. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structural schematic diagram of a low-temperature container in some embodiments.

[0030] Figure 2 Figure 1 is a local enlarged view at A in the middle.

[0031] Figure 3 is a local structural schematic diagram of a low-temperature container in some embodiments.

[0032] The reference signs are explained as follows:

[0033] outer shell 1, interlayer space 10, first through hole 11, temperature sensor 12, filling pipeline 13, filling valve 14, control system 15, inner shell 2, container cavity 20, liquid guide pipe 3, liquid inlet pipeline 30, interlayer pipeline 31, first pipe section 310, upwardly curved pipe section 311, downwardly extended pipe section 312, connecting pipe section 313, liquid outlet pipeline 32, first valve 320, second pipe section 321, third pipe section 322, liquid collector 4, gas return pipe 5, second valve 50, butt joint 6, mounting channel 60, liquid collection joint 7, liquid collection cavity 70, mounting bracket 8, heat insulation device 9. DETAILED DESCRIPTION

[0034] The typical embodiments embodying the features and advantages of the present application will be described in detail in the following description. It should be understood that the present application can have various changes in different embodiments, which do not deviate from the scope of the present application, and the description and drawings in essence are used for description, not for limiting the present application.

[0035] In the description of the present application, it should be understood that in the embodiments shown in the drawings, the indications of direction or position relationship (such as up, down, left, right, front and back, etc.) are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated devices or elements must have a particular orientation, be constructed and operated in a particular orientation. When the positions of these elements are changed, the indications of these directions are also changed accordingly.

[0036] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0037] In the prior art, in order to prevent overfilling, an overflow pipe is usually arranged in the inner shell, and the overflow pipe is led out of the outer shell, and an overflow valve is arranged on the overflow pipe. When the liquid level is expected to reach the filling liquid level, the external overflow valve is opened, and the medium flows out through the overflow pipe and the overflow valve, and the filling condition of the medium in the container is determined by observing the outflowing medium. However, when the overflow valve is opened, the inside of the container is connected with the atmosphere, regardless of whether the medium reaches the filling liquid level, which causes the medium to be discharged, resulting in medium loss and environmental pollution, and because the temperature of the medium is very low, the medium sprayed from the overflow valve can easily cause harm to personnel and cause safety accidents. In order to solve this problem, the embodiment of the present application provides a low-temperature container.

[0038] Referring to Figures 1 to 3 The embodiment of the present application provides a low-temperature container, which comprises an outer shell 1, an inner shell 2, a liquid guide pipe 3, a liquid collector 4 and a gas return pipe 5. The outer shell 1 is the outer shell part of the low-temperature container, which is hollow inside and is used for accommodating other components. The inside of the outer shell 1 is in a vacuum state to avoid heat conduction and keep the inside of the outer shell 1 at a low temperature.

[0039] In some embodiments, the inner shell 2 is arranged in the outer shell 1 in a spaced manner. The inner shell 2 is provided with a hollow container cavity 20 inside, which is used for accommodating the medium. The medium can be various frozen liquefied gases, such as liquefied natural gas, liquid oxygen, liquid nitrogen and other frozen liquefied media that need to be stored at a low temperature below-100 degrees. The interlayer space 10 between the inner shell 2 and the outer shell 1 is a vacuum thermal insulation interlayer, which ensures the thermal insulation performance by maintaining a high vacuum degree.

[0040] In some embodiments, the low-temperature container can comprise a filling pipeline 13, one end of the filling pipeline 13 extends into the outer shell 1 and the inner shell 2 in sequence, the filling pipeline 13 is in communication with the container cavity 20, and the other end of the filling pipeline 13 is connected with a filling device, which is used for filling the medium into the container cavity 20. The filling pipeline 13 can be in communication with the bottom of the inner shell 2, and the filling device is used to transfer the external medium to be stored into the container cavity 20.

[0041] In some embodiments, a filling valve 14 can be arranged on the filling pipeline 13. The filling valve 14 is located outside the outer shell 1 and is arranged on the filling pipeline 13, which is used to control the opening and closing of the filling pipeline 13. When the filling valve 14 is opened, the external medium can be filled into the container cavity 20 through the filling pipeline 13, and when the filling valve 14 is closed, the medium filling is completed. The filling valve 14 can be an electromagnetic on-off valve or a manually controlled on-off valve.

[0042] In the filling process, in order to avoid overfilling and to monitor the filling amount of the medium in real time, in the embodiment, the medium reaching the preset liquid level is guided out of the outer shell 1 through the liquid guide pipe 3 to observe the filling process. The liquid guide pipe 3 has two opposite ends, and the medium can flow through the liquid guide pipe 3. The two ends of the liquid guide pipe 3 are the liquid inlet end and the liquid outlet end. The liquid inlet end is located in the cavity 20 and is flush with the preset liquid level of the cavity 20. The preset liquid level indicates that the medium needs to be stopped when it is filled to this level. The preset liquid level can be set manually according to the design standard of the container. The preset liquid level of different specifications of the container may be different, and it can also be adjusted according to the actual need of the filling amount.

[0043] In some embodiments, the liquid outlet end of the liquid guide pipe 3 passes through the inner shell 2 and the outer shell 1 in turn to the outside of the outer shell 1. The liquid outlet end is vertically lower than the liquid inlet end. The medium in the cavity 20 at the preset liquid level can flow from the liquid inlet end to the liquid outlet end by its own gravity, so that the medium reaching the preset liquid level can flow out of the outer shell 1 through the liquid guide pipe 3, to facilitate further observation of the filling condition.

[0044] In some embodiments, the liquid collector 4 is arranged outside the outer shell 1. The liquid collector 4 is in communication with the liquid outlet end of the liquid guide pipe 3 to collect the medium flowing out of the cavity 20 through the liquid guide pipe 3. By arranging the liquid collector 4, the medium exceeding the preset liquid level can be concentrated and collected in the liquid collector 4. The liquid collector 4 can collect more medium per unit time, which can facilitate observation of the medium. When the medium is collected in the liquid collector 4, the outer surface of the liquid collector 4 will quickly frost due to the relatively higher external environment temperature and the extremely low temperature of the medium collected in the liquid collector 4. Therefore, the frosting condition of the surface of the liquid collector 4 can be observed to determine whether the medium in the cavity 20 has reached the preset liquid level. The operator can stop the filling operation accordingly.

[0045] In some embodiments, the cross-sectional area of the liquid collector 4 is larger than that of the liquid guide pipe 3, so that the liquid collector 4 can collect more medium per unit time, and the surface of the liquid collector 4 can frost more easily due to the temperature difference between the inside and outside of the medium, which facilitates observation.

[0046] In some embodiments, one end of the gas return pipe 5 is in communication with the liquid collector 4, and the other end is in communication with the part above the preset liquid level in the cavity 20. The gas return pipe 5 is used to return the gas formed by the vaporization of the medium due to the higher external temperature to the cavity 20, to avoid the medium being discharged to the atmosphere, thereby improving the safety during the monitoring process and avoiding pollution of the environment by the medium.

[0047] In some embodiments, the gas return pipe 5 can be a single pipe connected to the container cavity 20, which is used to return the gas generated by the medium vaporization to the container cavity 20. Alternatively, the gas return pipe 5 can be connected to the liquid outlet pipe of the container, and the gas generated by the medium vaporization is returned to the container cavity 20 through the liquid outlet pipe, thereby avoiding drilling holes on the outer shell 1 and the inner shell 2 due to the setting of the gas return pipe 5. It should be noted that one end of the liquid outlet pipe is connected to the top of the container cavity 20, and the container discharges the medium in the container cavity 20 through the liquid outlet pipe for use.

[0048] In some embodiments, the low-temperature container further comprises a temperature sensor 12 arranged on the liquid collector 4, which is used to detect the temperature in the liquid collector 4. When the medium in the container cavity 20 flows into the liquid collector 4, the temperature inside the liquid collector 4 will decrease due to the extremely low temperature of the medium. The temperature value detected by the temperature sensor 12 can more accurately determine whether the medium is collected in the liquid collector 4, thereby prompting the operator that the medium in the container cavity 20 has been filled in place. In this case, the detection end of the temperature sensor 12 can be inserted into the liquid collector 4, and when the medium is collected in the liquid collector 4, the temperature sensor 12 can detect the temperature value more quickly.

[0049] Of course, the detection end of the temperature sensor 12 can also be in contact with the outer surface of the liquid collector 4, and the temperature of the liquid collector 4 can be detected to determine whether the medium is collected in the liquid collector 4. In this way, the hole for the detection end of the temperature sensor 12 to penetrate into the liquid collector 4 can be avoided.

[0050] In some embodiments, the temperature sensor 12 can also be built-in in the liquid collector 4, and the detected measurement value can be sent to the outside through wireless communication for the operator to determine the medium filling condition in the liquid collector 4.

[0051] In some embodiments, the surface of the liquid collector 4 can be provided with a transparent area, so that the operator can directly observe the medium collection condition in the liquid collector 4.

[0052] Referring to Figure 3In some embodiments, the cryogenic container further comprises a control system 15 connected with the temperature sensor 12 and the filling valve 14, and the measured value detected by the temperature sensor 12 can be transmitted to the control system 15, and the control system 15 controls the opening and closing of the filling valve 14 according to the measured value of the temperature sensor 12. For example, when the temperature sensor 12 detects that the temperature in the liquid collector 4 reaches the preset temperature, the control system 15 controls the filling valve 14 to close accordingly, so that the filling pipeline 13 is closed and the medium filling into the cavity 20 is stopped. When the temperature sensor 12 detects that the temperature in the liquid collector 4 is much higher than the preset temperature, the control system 15 can control the filling valve 14 to open, so that the filling pipeline 13 is turned on for medium filling. The control system 15 can be a PLC control system 15, an embedded control system 15 or a single-chip microcomputer control system 15, and will not be described here.

[0053] In some embodiments, the cryogenic container further comprises a liquid collecting connector 7 arranged in the inner shell 2 for improving the efficiency of medium entering the liquid guide pipe 3. The liquid collecting connector 7 has a top-opened liquid collecting cavity 70, and the top surface of the liquid collecting connector 7 is flush with the preset liquid level, so that the medium reaching the preset liquid level enters the liquid collecting cavity 70 from the top of the liquid collecting cavity 70.

[0054] In some embodiments, the cross-sectional area of the liquid collecting cavity 70 gradually decreases from the top to the bottom, so that the liquid collecting cavity 70 has a funnel shape as a whole, the top inlet is large, which facilitates the medium flowing into the liquid collecting cavity 70 from the top, and the medium collected from the top of the liquid collecting cavity 70 flows along the inner surface of the liquid collecting cavity 70 to the bottom. The liquid inlet end of the liquid guide pipe 3 is connected to the bottom of the liquid collecting connector 7 and communicates with the bottom of the liquid collecting cavity 70, so that the medium collected from the liquid collecting cavity 70 enters the liquid guide pipe 3 and then flows to the liquid collector 4.

[0055] In some embodiments, the liquid collecting connector 7 can have a cylindrical structure or a columnar structure, which is not limited here.

[0056] In some embodiments, the inner surface of the liquid collecting cavity 70 can be curved or inclined, as long as the cross-sectional area decreases from the top to the bottom.

[0057] In some embodiments, the cryogenic container further comprises a mounting bracket 8 fixed to the inner wall of the inner shell 2, which is fixedly connected with the liquid collecting connector 7 and used for fixing the liquid collecting connector 7. The mounting bracket 8 can include two mounting shafts spaced in the up-down direction, one end of each mounting shaft is fixedly connected with the inner wall of the inner shell 2, and the other end is fixedly connected with the outer surface of the liquid collecting connector 7, so that the liquid collecting connector 7 has a certain distance from the inner wall of the inner shell 2, thereby facilitating the medium flowing into the liquid collecting connector 7.

[0058] In some embodiments, the mounting bracket 8 and the inner wall of the inner shell 2 can be fixedly connected by welding or can be integrally formed with the inner wall of the inner shell 2.

[0059] In some embodiments, the outer shell 1 is provided with a first through hole 11 on the peripheral wall, and the shape of the first through hole 11 is indefinite, which can be a circular hole or a rectangular hole.

[0060] In some embodiments, the low-temperature container further comprises an insulation device 9. The insulation device 9 is arranged on the peripheral wall of the outer shell 1 and covers the first through hole 11 to form a seal, thereby preventing the vacuum degree of the interlayer space 10 inside the outer shell 1 from being reduced. The insulation device 9 is provided with a second through hole, and the liquid outlet end of the liquid guide pipe 3 passes out of the outer shell 1 through the first through hole 11 and the second through hole in sequence. The liquid guide pipe 3 has a spacing from the hole wall of the first through hole 11 so as not to contact the hole wall of the first through hole 11, while the liquid guide pipe 3 contacts the hole wall of the second through hole to achieve sealing. In this way, the liquid guide pipe 3 and the outer shell 1 are thermally isolated, and the ultra-low temperature of the liquid guide pipe 3 will not be directly transmitted to the outer shell 1, thereby preventing the outer shell 1 from being suddenly cooled and cracked due to contact with the ultra-low temperature.

[0061] In some embodiments, the insulation device 9 can be made of low-temperature resistant materials such as titanium alloy, nickel-based alloy, ceramic composite material, etc. The insulation device 9 can be a cover structure with an open end, which covers the peripheral wall of the outer shell 1 and covers the first through hole 11 therein. The edge of the insulation device 9 is sealingly connected to the peripheral wall of the outer shell 1.

[0062] Referring to Figure 2 and Figure 3 In some embodiments, the liquid guide pipe 3 comprises a liquid inlet pipe 30, an interlayer pipe 31 and a liquid outlet pipe 32 connected in sequence. The liquid inlet pipe 30 is arranged in the cavity 20, the interlayer pipe 31 is arranged in the interlayer space 10 between the inner shell 2 and the outer shell 1, and the liquid outlet pipe 32 is arranged outside the outer shell 1. One end of the liquid inlet pipe 30 away from the interlayer pipe 31 forms a liquid inlet end for communicating with the liquid collecting connector 7. One end of the liquid outlet pipe 32 away from the interlayer pipe 31 forms a liquid outlet end for communicating with the liquid collector 4.

[0063] In some embodiments, in order to reduce the heat transfer inside the liquid guide pipe 3 and isolate the low-temperature medium in the outer shell 1, an insulating layer is covered on the outer surface of the interlayer pipe 31 to form an insulating pipe. Specifically, the insulating layer can be formed by covering insulating paper on the outer surface of the interlayer pipe 31, or by winding flexible materials such as rock wool felt and glass wool tape on the interlayer pipe 31 to form the insulating layer, or by spraying polyurethane foam or ceramic slurry on the surface of the interlayer pipe 31 to form the insulating layer.

[0064] In some embodiments, the heat transfer length can be increased by lengthening the length of the interlayer pipe 31 to reduce the heat conduction of the interlayer pipe 31, for example, the interlayer pipe 31 can be arranged as much as possible in the up-down direction, the length of the interlayer space 10 in the vertical direction can be used as much as possible, and the interlayer pipe 31 can also be arranged in a meandering manner in the interlayer space 10.

[0065] In some embodiments, the inner shell 2 is provided with a mounting hole in the peripheral wall, and the low-temperature container comprises a butt joint 6 mounted in the mounting hole. The butt joint 6 is provided with a mounting channel 60 in the axial direction of the mounting hole, and the liquid inlet pipe 30 and the interlayer pipe 31 are respectively inserted into the mounting channel 60 and connected in abutment, so that the liquid inlet pipe 30 and the interlayer pipe 31 avoid direct mounting contact with the inner shell 2, thereby avoiding the generation of a large stress due to the difference in shrinkage at low temperature caused by the possible difference in thermal expansion coefficient between the material of the liquid guide pipe 3 and the inner shell 2, which can cause cracking at the connection. The butt joint 6 in the present embodiment can be made of a compatible material with the inner shell 2, and the two are welded together to reduce the interfacial stress. At the same time, the liquid inlet pipe 30 and the interlayer pipe 31 are connected through the butt joint 6, which can facilitate disassembly and installation, facilitate separation of the liquid guide pipe 3 and the container, and simplify the maintenance process.

[0066] In some embodiments, the liquid inlet pipe 30 and the interlayer pipe 31 and the butt joint 6 can be connected by flange connection, threaded connection and flexible connection to avoid leakage.

[0067] In some embodiments, the interlayer pipe 31 comprises a first pipe segment 310, an upwardly inclined pipe segment 311, a downwardly extending pipe segment 312 and a connecting pipe segment 313 connected in sequence. The first pipe segment 310 is connected to the liquid inlet pipe 30, the upwardly inclined pipe segment 311 is inclined upwardly and has a low end and a high end, the low end is connected to the first pipe segment 310, the high end is connected to the downwardly extending pipe segment 312, one end of the downwardly extending pipe segment 312 is connected to the high end, the other end extends downwardly, the connecting pipe segment 313 is arranged at the bottom end of the downwardly extending pipe segment 312 and connected thereto, and the connecting pipe segment 313 extends in the horizontal direction and is connected to the liquid outlet pipe 32. By arranging the first pipe segment 310, the upwardly inclined pipe segment 311, the downwardly extending pipe segment 312 and the connecting pipe segment 313, the interlayer pipe 31 can be arranged in a meandering manner in the interlayer space 10 to increase the length of the interlayer pipe 31.

[0068] In some embodiments, the liquid outlet pipeline 32 is provided with a first valve 320 for controlling the opening and closing of the liquid outlet pipeline 32. When the first valve 320 is opened, the liquid outlet pipeline 32 is open, and if the medium exceeds the preset liquid level, it will flow to the liquid collector 4 through the liquid outlet pipeline 32, so as to determine the filling condition of the medium in the cavity 20. When the filling is determined to be in place through the liquid collector 4, the first valve 320 is closed, the liquid outlet pipeline 32 is closed, and the filling operation is stopped. A closed space is formed in the interlayer pipeline 31, and the medium near the outer shell 1 vaporizes and rises to gather at the top of the upward tube segment 311 and the downward tube segment 312, thereby forming a gas seal structure to isolate the low-temperature medium from the external hot environment and reduce heat loss.

[0069] It should be noted that, in order to enable the medium to flow from the upward tube segment 311 to the downward tube segment 312, the high end of the upward tube segment 311 should be lower than the preset liquid level in the vertical direction.

[0070] In some embodiments, the liquid outlet pipeline 32 includes a second tube segment 321 and a third tube segment 322. The second tube segment 321 extends in the vertical direction and is connected to the connecting tube segment 313. The third tube segment 322 extends in the horizontal direction, and the bottom end of the third tube segment 322 is connected to the second tube segment 321, so that the medium flowing out of the interlayer pipeline 31 can flow into the liquid collector 4 through the second tube segment 321 and the third tube segment 322 in sequence under the influence of its own gravity.

[0071] In some embodiments, the gas return pipe 5 is provided with a second valve 50 for controlling the opening and closing of the gas return pipe 5. The second valve 50 is located outside the outer shell 1, which is convenient for control operation. During the filling process, the first valve 320 and the second valve 50 can be opened to enable the medium to flow into the liquid collector 4 for observation, and at the same time, the medium vaporized can flow back to the cavity 20 through the gas return pipe 5, thereby forming a closed loop circulation. After the filling is completed, the first valve 320 and the second valve 50 can be closed to avoid leakage of the medium.

[0072] In summary, in the present application, by providing the liquid guide pipe 3, the liquid collector 4 and the gas return pipe 5, the liquid inlet end face of the liquid guide pipe 3 is flush with the preset liquid level, so that when the medium filling reaches the preset liquid level, the medium can flow to the liquid collector 4 provided outside by using its own gravity, and the filling condition of the medium in the cavity 20 is determined by observing the frosting condition of the surface of the liquid collector 4. At the same time, the liquid collector 4 and the part above the preset liquid level in the cavity 20 are connected through the gas return pipe 5, so that the gas formed by the vaporization of the medium in the external environment flows back to the cavity 20, avoiding the discharge of the medium, thereby improving the safety of the monitoring process and avoiding pollution of the environment by the medium.

[0073] While the present application has been described with reference to several exemplary embodiments, it is understood that the words that have been used are words of description and illustration, rather than words of limitation. As mentioned above, the present application is capable of taking many forms of implementation and being practiced in various ways, and the above description is not intended to limit the application in any way, except as required by the appended claims and their equivalents.

Claims

1. A cryogenic vessel, characterized by, The low-temperature container comprises an outer shell, an inner shell, a liquid guide pipe, a liquid collector and a gas return pipe. The inner shell is arranged in the outer shell and has a hollow cavity inside for accommodating medium. The liquid guide pipe has opposite ends, i.e., a liquid inlet end and a liquid outlet end. The liquid inlet end is located in the cavity and is flush with a preset liquid level in the cavity. The liquid outlet end extends through the inner shell and the outer shell to the outside of the outer shell. The liquid outlet end is vertically lower than the liquid inlet end. The medium at the preset liquid level in the cavity can flow from the liquid inlet end to the liquid outlet end by gravity. The liquid collector is arranged outside the outer shell and is in communication with the liquid outlet end of the liquid guide pipe to collect the medium flowing out of the cavity through the liquid guide pipe. The gas return pipe is in communication with the liquid collector at one end and with the part of the cavity above the preset liquid level at the other end to return the gas formed by the vaporization of the medium into the cavity.

2. The low-temperature container of claim 1, wherein the liquid guide pipe comprises a liquid inlet pipe, a sandwich pipe and a liquid outlet pipe connected in sequence. The liquid inlet pipe is arranged in the cavity. The sandwich pipe is arranged in a sandwich space between the inner shell and the outer shell. The liquid outlet pipe is arranged outside the outer shell.

4. The cryogenic container of claim 2, wherein, The end of the liquid inlet pipe away from the sandwich pipe forms the liquid inlet end. The end of the liquid outlet pipe away from the sandwich pipe forms the liquid outlet end. The outer surface of the sandwich pipe is covered with a heat insulation layer to form a heat insulation pipe.

3. The low-temperature container of claim 2, wherein the sandwich pipe comprises a first pipe segment, an upwardly inclined pipe segment and a downwardly extended pipe segment connected in sequence. The first pipe segment is connected to the liquid inlet pipe. The upwardly inclined pipe segment is inclined upwardly and has a low end and a high end. The low end is connected to the first pipe segment. The high end is connected to the downwardly extended pipe segment. One end of the downwardly extended pipe segment is connected to the high end. The other end extends downwardly. The sandwich pipe comprises a connecting pipe segment arranged at the bottom end of the downwardly extended pipe segment. The connecting pipe segment extends horizontally and is connected to the liquid outlet pipe. A first valve is arranged on the liquid outlet pipe to control the opening and closing of the liquid outlet pipe. The liquid outlet pipe comprises a second pipe segment and a third pipe segment. The second pipe segment extends vertically. The third pipe segment extends horizontally and is connected to the bottom end of the second pipe segment. A second valve is arranged on the gas return pipe to control the opening and closing of the gas return pipe. The second valve is located outside the outer shell.

5. The low-temperature container of claim 2, wherein a mounting hole is arranged on the peripheral wall of the inner shell. The low-temperature container further comprises a butt joint. The butt joint is mounted in the mounting hole. The butt joint has a mounting channel in the axial direction of the mounting hole. The liquid inlet pipe and the sandwich pipe extend into the mounting channel and are butt-connected.

6. The low-temperature container of claim 1, wherein The low-temperature container further comprises a liquid collecting connector having a top-opened liquid collecting cavity, a cross-section area of the liquid collecting cavity gradually decreases from a top to a bottom of the liquid collecting cavity, the liquid inlet end is connected to the bottom of the liquid collecting connector and communicates with the bottom of the liquid collecting cavity, and a top surface of the liquid collecting connector is flush with the preset liquid level.

7. The low-temperature container according to claim 6, wherein, The low-temperature container further comprises a mounting bracket fixed to an inner wall of the inner shell, and the mounting bracket is fixedly connected with the liquid collecting connector.

8. The low-temperature container according to claim 1, wherein, The outer shell further comprises a first through hole formed in a peripheral wall of the outer shell; The low-temperature container further comprises an insulation device, the insulation device is arranged on the peripheral wall of the outer shell and covers the first through hole, the insulation device further comprises a second through hole, and the liquid outlet end of the liquid guide pipe sequentially passes through the first through hole and the second through hole to the outside of the outer shell, the liquid guide pipe has a spacing with a wall of the first through hole and is connected with a wall of the second through hole.

9. The low-temperature container according to claim 1, wherein, The low-temperature container further comprises a temperature sensor, the temperature sensor is arranged on the liquid collector and is used to detect a temperature in the liquid collector.

10. The low-temperature container according to claim 9, wherein, The low-temperature container further comprises a filling pipeline, a filling valve and a control system, the filling pipeline communicates with the container cavity and is used to fill a medium into the container cavity, the filling valve is arranged on the filling pipeline and is located outside the outer shell and is used to control opening and closing of the filling pipeline, and the control system is connected with the temperature sensor and the filling valve and is used to control opening and closing of the filling valve according to a measurement value of the temperature sensor.

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