Cryogenic adiabatic module air tightness and internal gas flowability testing device

Abstract

A device for testing the airtightness and internal gas flow of a cryogenic insulation module includes an inlet / liquid inlet module, an outlet / liquid outlet module, and an insulation module. The inlet / liquid inlet module includes an inner space liquid nitrogen inlet valve, an outer space liquid nitrogen inlet valve, a low-pressure control module, an inner space high-pressure control module, an outer space high-pressure control module, a buffer tank, a pressure reducing valve, and a filter, all connected via pipes. The outlet / liquid outlet module includes a liquid nitrogen / nitrogen exhaust valve, an inner space exhaust valve, and an outer space exhaust valve, all connected via pipes. The outlet of the inlet / liquid inlet module is connected to the inlet of the insulation module, and the inlet of the outlet / liquid outlet module is connected to the outlet of the insulation module. This invention enables the airtightness testing and adaptability study of insulation modules under cryogenic and ambient temperature conditions, as well as the testing and research of internal gas flow performance.

Description

Technical Field

[0001] This invention relates to the field of cryogenic insulation module testing technology, and in particular to a device for testing the airtightness and internal gas flow of a cryogenic insulation module. Background Technology

[0002] The innovative development of cryogenic working fluid (such as liquefied natural gas, liquid oxygen, liquid nitrogen, liquid hydrogen, and liquid helium) storage and transportation systems and equipment relies on continuous research and innovative improvements in various cryogenic technologies, including insulation material performance testing, insulation structure design, and cryogenic performance testing. Cryogenic enclosure system performance testing is the foundation for verifying key technologies and core systems. Related technology breakthroughs, R&D, prototype manufacturing, and verification all require the support of a cryogenic enclosure system performance testing system. Sealing performance in cryogenic environments is a crucial technical indicator for insulation modules and a vital guarantee for the safety of cryogenic enclosure systems during operation. Simultaneously, the internal space of the insulation module needs good gas flow performance in specific areas and directions to ensure effective replacement of non-inert gases such as water vapor and oxygen. The main purpose of the cryogenic insulation module airtightness and internal gas flow test device is to conduct airtightness testing and adaptability research of insulation modules in cryogenic environments, as well as internal space gas flow performance testing and research. It also aims to investigate the changes in internal space dew point temperature and structural moisture content during inert gas replacement, provide guidance for the structural design, processing and installation of insulation modules, improve the reliability of independently developed results, and provide a technical foundation for practical applications such as large storage tanks and liquefied natural gas ships.

[0003] A search revealed no publicly available systems or similar testing systems for testing the airtightness and internal gas flow performance of cryogenic insulation modules. Therefore, testing technologies for the airtightness and internal gas flow performance of cryogenic enclosure system insulation modules under both cryogenic and ambient temperature conditions are lacking. To improve the testing level and reliability of test results for the airtightness and internal gas flow performance of cryogenic enclosure systems, expand multi-condition testing capabilities, increase testing efficiency, and reduce testing costs, higher demands are placed on the development capabilities of testing devices suitable for the airtightness and internal gas flow performance of cryogenic insulation modules.

[0004] Therefore, those skilled in the art are dedicated to developing a testing device for the airtightness and internal gas flow of cryogenic insulation modules, which can meet the needs of conducting airtightness testing and adaptability studies, as well as internal gas flow performance testing and research of cryogenic insulation modules under both cryogenic and ambient temperature conditions. Summary of the Invention

[0005] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is:

[0006] 1. There is still a lack of testing technologies for the airtightness of the insulation module system and the gas flow performance of the internal space of the low-temperature enclosure system under low-temperature and normal-temperature conditions.

[0007] 2. Testing the airtightness of the insulation module system and the gas flow performance of the internal space of the low-temperature enclosure system under low-temperature and normal-temperature conditions requires multiple pressure gradients and independent pressure control.

[0008] 3. The airtightness and internal space gas flow performance testing of the building envelope insulation module system includes a low temperature condition of -196℃;

[0009] 4. The testing of the airtightness of the thermal insulation module system and the gas flow performance of the internal space of the building envelope includes multiple test targets and multiple test conditions.

[0010] 5. There are many different specifications and sizes of insulation modules for the building envelope system, and the interface locations vary.

[0011] To achieve the above objectives, the present invention provides a testing device for the airtightness and internal gas flow of a cryogenic insulation module, comprising an inlet / liquid inlet module, an outlet / liquid outlet module, and an insulation module. The inlet / liquid inlet module includes an inner space liquid nitrogen inlet valve, an outer space liquid nitrogen inlet valve, a low-pressure control module, an inner space high-pressure control module, an outer space high-pressure control module, a buffer tank, a pressure reducing valve, and a filter, all connected via pipes. The outlet / liquid outlet module includes a liquid nitrogen / nitrogen exhaust valve, an inner space exhaust valve, and an outer space exhaust valve, all connected via pipes. The outlets of the inner space liquid nitrogen inlet valve, the low-pressure control module, and the inner space high-pressure control module are connected in parallel to the inlet of the inner space of the insulation module. The outlet of the outer space high-pressure control module... The outlet of the outer space liquid nitrogen inlet valve is connected in parallel to the inlet of the outer space of the insulation module; the inlets of the low-pressure control module, the inner space high-pressure control module, and the outer space high-pressure control module are connected in parallel and sequentially connected to the buffer tank, the pressure reducing valve, and the filter before being connected to the nitrogen inlet port; the inlets of the inner space liquid nitrogen inlet valve and the outer space liquid nitrogen inlet valve are respectively connected to the liquid nitrogen inlet port; the inner space outlet of the insulation module is connected to the inlet of the inner space exhaust valve; the outer space outlet of the insulation module is connected to the inlet of the outer space exhaust valve; the outlets of the inner space exhaust valve and the outer space exhaust valve are connected in parallel and connected to the liquid nitrogen / nitrogen discharge port via the liquid nitrogen / nitrogen discharge valve.

[0012] Furthermore, the exhaust / drainage module also includes a negative pressure suction valve. The outlets of the inner space exhaust valve and the outer space exhaust valve are connected in parallel through the pipeline and connected to the negative pressure suction port through the negative pressure suction valve.

[0013] Furthermore, the low-pressure control module includes a low-pressure controller outlet valve, a low-pressure controller inlet valve, and a low-pressure controller connected through the pipeline. The outlet of the low-pressure controller outlet valve serves as the outlet of the low-pressure control module. The low-pressure controller outlet valve is connected to the outlet of the low-pressure controller inlet valve via the low-pressure controller. The inlet of the low-pressure controller inlet valve serves as the inlet of the low-pressure control module.

[0014] Furthermore, the inner space high-pressure control module includes an inner space high-pressure controller outlet valve, an inner space high-pressure controller inlet valve, and an inner space high-pressure controller connected through the pipeline. The outlet of the inner space high-pressure controller outlet valve serves as the outlet of the inner space high-pressure control module. The inner space high-pressure controller outlet valve is connected to the outlet of the inner space high-pressure controller inlet valve via the inner space high-pressure controller. The inlet of the inner space high-pressure controller inlet valve serves as the inlet of the inner space high-pressure control module.

[0015] Furthermore, the outer space high-pressure control module includes an outer space high-pressure controller outlet valve, an outer space high-pressure controller inlet valve, and an outer space high-pressure controller connected through the pipeline. The outlet of the outer space high-pressure controller outlet valve serves as the outlet of the outer space high-pressure control module. The outer space high-pressure controller outlet valve is connected to the outer space high-pressure controller inlet valve outlet via the outer space high-pressure controller. The inlet of the outer space high-pressure controller inlet valve serves as the inlet of the outer space high-pressure control module.

[0016] Furthermore, the outlets of the inner space liquid nitrogen inlet valve, the low-pressure control module, and the inner space high-pressure control module are connected in parallel and connected to the inlet of the inner space of the insulation module via a first pipe and an inner space inlet metal hose; the outlets of the outer space high-pressure control module and the outer space liquid nitrogen inlet valve are connected in parallel and connected to the inlet of the outer space of the insulation module via a second pipe and an outer space inlet metal hose.

[0017] Furthermore, the inner space outlet of the insulation module is connected to the inlet of the inner space exhaust valve via a third pipe and an inner space outlet metal hose, and the outer space outlet of the insulation module is connected to the inlet of the outer space exhaust valve via a fourth pipe and an outer space outlet metal hose.

[0018] Furthermore, the outlet of the inner space exhaust valve is connected to one end of the fifth pipe, the outlet of the outer space exhaust valve is connected to one end of the sixth pipe, and the other ends of the fifth pipe and the sixth pipe are connected in parallel.

[0019] Furthermore, the first pipe is equipped with an inner space inlet pressure sensor and an inner space inlet temperature sensor; the second pipe is equipped with an outer space inlet pressure sensor and an outer space inlet temperature sensor.

[0020] Furthermore, the first pipeline is also equipped with an inner space inlet safety valve, and the second pipeline is also equipped with an outer space inlet safety valve.

[0021] Furthermore, an inner space outlet safety valve is installed on the third pipe, and an outer space outlet safety valve is installed on the fourth pipe.

[0022] Furthermore, the fifth pipe is equipped with an inner space outlet temperature sensor, an inner space outlet oxygen content sensor, and an inner space outlet dew point thermometer, and the sixth pipe is equipped with an outer space outlet temperature sensor, an outer space outlet oxygen content sensor, and an outer space outlet dew point thermometer.

[0023] Furthermore, the negative pressure suction valve, the liquid nitrogen / nitrogen discharge valve, the inner space exhaust valve, the outer space exhaust valve, the inner space liquid nitrogen inlet valve, the low pressure controller outlet valve, the inner space high pressure controller outlet valve, the outer space high pressure controller outlet valve, and the outer space liquid nitrogen inlet valve are cryogenic valves with an operating temperature of -196℃.

[0024] Furthermore, the inner space exhaust valve, the outer space exhaust valve, the inner space liquid nitrogen inlet valve, the low-pressure controller outlet valve, the inner space high-pressure controller outlet valve, the outer space high-pressure controller outlet valve, and the outer space liquid nitrogen inlet valve are pneumatic valves.

[0025] Furthermore, the negative pressure suction valve, the liquid nitrogen / nitrogen discharge valve, the low pressure controller inlet valve, the inner space high pressure controller inlet valve, and the outer space high pressure controller inlet valve are all solenoid valves.

[0026] Furthermore, the negative pressure suction valve, the liquid nitrogen / nitrogen discharge valve, the inner space exhaust valve, the outer space exhaust valve, the inner space liquid nitrogen inlet valve, the low pressure controller outlet valve, the low pressure controller inlet valve, the inner space high pressure controller outlet valve, the inner space high pressure controller inlet valve, the outer space high pressure controller outlet valve, the outer space high pressure controller inlet valve, and the outer space liquid nitrogen inlet valve are fixed to the pipeline by welding.

[0027] Furthermore, the low-pressure controller, the inner space high-pressure controller, the outer space high-pressure controller, and the pipeline are fixed together via a vacuum coupling radius (VCR) sealing interface.

[0028] Furthermore, the oxygen content sensor at the inner space outlet, the dew point thermometer at the inner space outlet, the oxygen content sensor at the outer space outlet, the dew point thermometer at the outer space outlet, and the pipeline are fixed together via a vacuum-sealed radial connection interface.

[0029] Furthermore, the inner space inlet pressure sensor, the inner space inlet temperature sensor, the outer space inlet pressure sensor, and the outer space inlet temperature sensor are fixed to the pipeline by threaded connection.

[0030] Furthermore, the first pipe, the second pipe, the third pipe, and the fourth pipe are stainless steel pipes.

[0031] Furthermore, the inner space inlet metal hose, the outer space inlet metal hose, the inner space outlet metal hose, and the outer space outlet metal hose are fixed to the insulation module via a vacuum connection radial sealing interface, and the inner space inlet metal hose, the outer space inlet metal hose, the inner space outlet metal hose, and the outer space outlet metal hose are fixed to the first pipe, the second pipe, the third pipe, and the fourth pipe by welding.

[0032] Furthermore, the inner space and the outer space are continuous channels with a boundary seal formed by the joints of the insulation modules.

[0033] Compared with the prior art, the present invention has the following main advantages:

[0034] (1) Establishment of testing techniques for the airtightness and internal space gas flow performance of cryogenic enclosure systems under both cryogenic (liquid nitrogen temperature range) and ambient (room temperature range) conditions. The principle of cryogenic fluid transport process control was applied to achieve testing of the airtightness and internal space gas flow performance of cryogenic enclosure system insulation modules under different processes and testing conditions. This fills the gap in testing techniques for the airtightness and internal space gas flow performance of cryogenic enclosure system insulation modules under cryogenic (liquid nitrogen temperature range) and ambient (room temperature range) conditions.

[0035] (2) A graded precision pressure control technology is introduced, which controls pressure through a pressure reducing valve connected in series with three sets of pressure controllers. The pressure reducing valve is connected in series with the high-precision pressure controllers, and precise pressure control is achieved after the first stage of pressure reduction. The input pressure of cryogenic and normal temperature fluids is also controlled independently. This enables independent and precise pressure control between the inner and outer spaces of the insulation module in the cryogenic enclosure system.

[0036] (3) Introduction of liquid nitrogen input and process control technology. Liquid nitrogen at -196℃ flows directly into the insulation module of the enclosure system, and cools the insulation module through its latent heat. This can achieve pre-cooling of the insulation module of the low-temperature enclosure system, thereby completing the tightness test of the insulation module of the low-temperature enclosure system under low-temperature conditions.

[0037] (4) A combination of valves and pressure controllers in parallel is adopted. By controlling the fluid flow direction using valves, different test objectives can be carried out synchronously or in parallel based on the test type and process. This allows the same test system to conduct different test contents, improving test efficiency and reducing test costs.

[0038] (5) The main connection method for the cryogenic insulation module airtightness and internal gas flow test device is the use of a radially sealed interface with a metal flexible hose connected to a vacuum. The spatial compensation characteristics of the metal flexible hose ensure compatibility with different insulation module specifications and interface positions for different enclosure systems. The removability of the VCR sealed interface allows for the replacement of internal components. This device can test the airtightness and internal gas flow performance of cryogenic enclosure system insulation modules of different sizes and specifications. Replacing cryogenic enclosure system insulation module specimens is convenient and efficient.

[0039] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0040] Figure 1 This is a system composition diagram of an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of the structure of an exhaust / drainage module according to an embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of the air / liquid intake module according to an embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of the structure of an insulation module according to an embodiment of the present invention. Detailed Implementation

[0044] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, which will make the invention clearer and easier to understand. The present invention can be embodied in many different forms, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0045] In the accompanying drawings, parts with the same structure are indicated by the same numerical designation, and components with similar structure or function are indicated by similar numerical designation.

[0046] This embodiment provides a system for testing the airtightness and internal gas flow performance of cryogenic enclosure systems.

[0047] 2. Negative pressure exhaust valve; 3. Liquid nitrogen / nitrogen exhaust valve; 4. Inner space exhaust valve; 5. Outer space exhaust valve; 6. Inner space liquid nitrogen inlet valve; 7. Low pressure controller outlet valve; 8. Low pressure controller inlet valve; 9. Inner space high pressure controller outlet valve; 10. Inner space high pressure controller inlet valve; 11. Outer space high pressure controller outlet valve; 12. Outer space high pressure controller inlet valve; 13. Outer space liquid nitrogen inlet valve; 14. Pressure reducing valve; 15. Inner space outlet pressure sensor; 16. Outer space outlet pressure sensor; 17. Inner space inlet pressure sensor; 18. Inner... The following components are listed: inner space outlet temperature sensor 19, outer space outlet temperature sensor 20, inner space inlet temperature sensor 21, outer space inlet temperature sensor 22, inner space outlet oxygen content sensor 23, outer space outlet oxygen content sensor 24, inner space outlet dew point thermometer 25, outer space outlet dew point thermometer 26, low-pressure controller 27, inner space high-pressure controller 28, outer space high-pressure controller 29, inner space outlet safety valve 30, outer space outlet safety valve 31, inner space inlet safety valve 32, outer space inlet safety valve 33, buffer tank 34, and filter 35. Figures 1 to 4The circuit is connected via pipes, and then via inner space outlet metal hose 36, outer space outlet metal hose 37, inner space inlet metal hose 38, and outer space inlet metal hose 39 to the insulation module 1. Specifically, the low-pressure controller outlet valve 7, low-pressure controller 27, and low-pressure controller inlet valve 8 are connected in series to form a low-pressure control module; the inner space high-pressure controller outlet valve 9, inner space high-pressure controller 28, and inner space high-pressure controller inlet valve 10 are connected in series to form an inner space high-pressure control module; and the outer space high-pressure controller outlet valve 11, outer space high-pressure controller 29, and outer space high-pressure controller inlet valve 12 are connected in series to form an outer space high-pressure control module. The inner space liquid nitrogen inlet valve 6, the outer space liquid nitrogen inlet valve 13, the low-pressure control module, the inner space high-pressure control module, the outer space high-pressure control module, the buffer tank 34, the pressure reducing valve 14, and the filter 35 constitute the air / liquid inlet module 200. The negative pressure suction valve 2, the liquid nitrogen / nitrogen discharge valve 3, the inner space exhaust valve 4, and the outer space exhaust valve 5 constitute the exhaust / liquid drain module 100. The outlet of the air / liquid inlet module 200 is connected to the inlet of the insulation module 1, and the inlet of the exhaust / liquid drain module 100 is connected to the outlet of the insulation module 1.

[0048] The outlets of the low-pressure controller outlet valve 7, the inner space liquid nitrogen inlet valve 6, and the inner space high-pressure controller outlet valve 9 are connected in parallel to the first pipe 40. The first pipe 40 is connected to the inlet of the inner space 46 via the inner space inlet metal hose 38. The outlets of the outer space high-pressure controller outlet valve 11 and the outer space liquid nitrogen inlet valve 13 are connected in parallel to the inlet of the outer space 47. The outlet of the inner space 46 is connected to one end of the inner space outlet metal hose 36, and the other end of the inner space outlet metal hose 36 is connected to the inlet of the inner space exhaust valve 4 via the third pipe 42. The outlet of the inner space exhaust valve 4 is connected to the negative pressure extraction valve 2 and the liquid nitrogen / nitrogen discharge valve 3 via the fifth pipe 44. The outlet of the outer space 47 is connected to one end of the outer space outlet metal hose 37, and the other end of the outer space outlet metal hose 37 is connected to the inlet of the outer space exhaust valve 5 through the fourth pipe 43. The outlet of the outer space exhaust valve 5 is connected to the negative pressure suction valve 2 and the liquid nitrogen / nitrogen discharge valve 3 through the sixth pipe 45.

[0049] All valves and pipes are fixed by welding; all pressure controllers, all dew point thermometers, and all oxygen sensors are fixed to pipes by VCR sealing interfaces; all pressure sensors and temperature sensors are fixed to pipes by threaded connections; all metal hoses and insulation modules are fixed by VCR sealing interfaces; and all metal hoses and pipes are fixed by welding.

[0050] The following valves are cryogenic valves with an operating temperature of -196℃: 2. Negative pressure suction valve; 3. Liquid nitrogen / nitrogen discharge valve; 4. Inner space exhaust valve; 5. Outer space exhaust valve; 6. Inner space liquid nitrogen inlet valve; 7. Low pressure controller outlet valve; 9. Inner space high pressure controller outlet valve; 11. Outer space high pressure controller outlet valve; and 13. Outer space liquid nitrogen inlet valve.

[0051] The inner space exhaust valve 4, outer space exhaust valve 5, inner space liquid nitrogen inlet valve 6, low pressure controller outlet valve 7, inner space high pressure controller outlet valve 9, outer space high pressure controller outlet valve 11, and outer space liquid nitrogen inlet valve 13 are pneumatic valves. The negative pressure suction valve 2, liquid nitrogen / nitrogen discharge valve 3, low pressure controller inlet valve 8, inner space high pressure controller inlet valve 10, and outer space high pressure controller inlet valve 12 are solenoid valves.

[0052] This embodiment can achieve at least five working processes:

[0053] a. Low-temperature enclosure system insulation module room temperature (room temperature range) airtightness test mode:

[0054] By opening the low-pressure controller outlet valve 7 and inlet valve 8, and closing the inner space exhaust valve 4, nitrogen gas passes through filter 35 and is then depressurized by pressure reducing valve 14 before entering buffer tank 34 to stabilize the airflow. After precise pressure control by low-pressure controller 27, it enters the inner space of insulation module 1. Once the pressure stabilizes, the system pressure changes are monitored by inner space outlet pressure sensor 15 and inner space inlet pressure sensor 17. Subsequently, the value of low-pressure controller 27 is adjusted to change the system pressure, and multiple repeated tests are conducted to obtain the room temperature tightness test results of the low-temperature enclosure system insulation module.

[0055] b. Pre-cooling mode for insulation modules of low-temperature enclosure system:

[0056] By opening the inner space liquid nitrogen inlet valve 6, the outer space liquid nitrogen inlet valve 13, the inner space exhaust valve 4, the outer space exhaust valve 5, and the liquid nitrogen / nitrogen discharge valve 3, and closing the low-pressure controller outlet valve 7, the inner space high-pressure controller outlet valve 9, the outer space high-pressure controller outlet valve 11, and the negative pressure extraction valve 2, liquid nitrogen is slowly introduced into the insulation module 1 by adjusting the opening of the inner space liquid nitrogen inlet valve 6 and the outer space liquid nitrogen inlet valve 13. The readings of the inner space outlet temperature sensor 19, the outer space outlet temperature sensor 20, the inner space inlet temperature sensor 21, and the outer space inlet temperature sensor 22 are monitored. When the temperatures shown by the inner space outlet temperature sensor 19 and the outer space outlet temperature sensor 20 reach the liquid nitrogen temperature range, the pre-cooling of the insulation module of the enclosure system can be considered complete.

[0057] c. Low-temperature (liquid nitrogen temperature range) tightness test mode for insulation modules of low-temperature enclosure systems:

[0058] After the insulation module 1 has been pre-cooled, the low-pressure controller outlet valve 7 and inlet valve 8 are opened, while the inner space exhaust valve 4, inner space liquid nitrogen inlet valve 6, and outer space liquid nitrogen inlet valve 13 are closed. Nitrogen gas passes through filter 35 and is then depressurized by pressure reducing valve 14 before entering buffer tank 34 to stabilize the airflow. After precise pressure control by low-pressure controller 27, the gas enters the inner space of insulation module 1. Once the pressure stabilizes, the pressure changes within the system are monitored by inner space outlet pressure sensor 15 and inner space inlet pressure sensor 17. Subsequently, the value of low-pressure controller 27 is adjusted to change the system pressure, and multiple repeated tests are conducted to obtain the low-temperature tightness test results of the insulation module of the low-temperature enclosure system.

[0059] d. Test mode for gas flow performance of the inner space of the insulation module of the low-temperature enclosure system:

[0060] By opening the liquid nitrogen / nitrogen exhaust valve 3, the inner space exhaust valve 4, the inner space high-pressure controller outlet valve 9, and the inner space high-pressure controller inlet valve 10, and closing the low-pressure controller outlet valve 7, the outer space exhaust valve 5, the negative pressure extraction valve 2, the inner space liquid nitrogen inlet valve 6, the outer space liquid nitrogen inlet valve 13, and the outer space high-pressure controller outlet valve 11, and by adjusting the pressure reducing valve 14, the nitrogen pressure entering the system is initially reduced and stabilized by the buffer tank 34. Then, by setting the inner space high-pressure controller 28 for precise pressure control, constant-pressure nitrogen enters the inner space of the insulation module 1. At the same time, the oxygen content sensor 23 and the dew point thermometer 25 at the inner space outlet are monitored to evaluate the change in structural water content during the gas flow process in the inner space of the insulation module 1. Subsequently, the set value of the high pressure controller 28 in the inner space was adjusted to change the system pressure, and the nitrogen gas remaining in the system was extracted by opening the negative pressure extraction valve 2. Multiple numerical repeated tests were carried out to obtain the test results of the gas flow performance of the inner space inside the low temperature enclosure system.

[0061] e. Test mode for gas flow performance of the inner and outer space of the insulation module of a low-temperature enclosure system:

[0062] By opening the outer space exhaust valve 5, liquid nitrogen / nitrogen exhaust valve 3, outer space high pressure controller outlet valve 11, and outer space high pressure controller inlet valve 12, and closing the inner space exhaust valve 4, negative pressure extraction valve 2, inner space liquid nitrogen inlet valve 6, low pressure controller outlet valve 7, inner space high pressure controller outlet valve 9, and outer space liquid nitrogen inlet valve 13, and by adjusting the pressure reducing valve 14, the nitrogen pressure entering the system is initially reduced and stabilized by the buffer tank 34. Subsequently, by setting the outer space high pressure controller 29 for precise pressure control, constant pressure nitrogen enters the outer space inside the insulation module 1. At the same time, the values ​​of the outer space outlet oxygen content sensor 24 and the outer space outlet dew point thermometer 26 are monitored to evaluate the change in structural water content during the gas flow process inside the outer space of the insulation module 1. Subsequently, the set value of the outer space high pressure controller 29 was adjusted to change the system pressure, and the nitrogen gas remaining in the system was extracted by opening the negative pressure extraction valve 2. Multiple numerical repeated tests were carried out to obtain the test results of the gas flow performance of the outer space inside the low temperature enclosure system.

[0063] f. Parallel testing mode of gas flow performance between the inner space and the outer space of the insulation module of the low-temperature enclosure system:

[0064] By opening the liquid nitrogen / nitrogen exhaust valve 3, the inner space exhaust valve 4, the outer space exhaust valve 5, the inner space high-pressure controller outlet valve 9, the inner space high-pressure controller inlet valve 10, the outer space high-pressure controller outlet valve 11, and the outer space high-pressure controller inlet valve 12, and closing the negative pressure extraction valve 2, the inner space liquid nitrogen inlet valve 6, the low-pressure controller outlet valve 7, and the outer space liquid nitrogen inlet valve 13, and by adjusting the pressure reducing valve 14, the nitrogen pressure entering the system is initially reduced, and then passed through the buffer tank 34. After stabilization, precise pressure control was achieved by setting the inner space high-pressure controller 28 and the outer space high-pressure controller 29 to allow constant-pressure nitrogen to enter both the inner and outer spaces of the insulation module. Simultaneously, the values ​​of the oxygen content sensor 23, the dew point thermometer 25, the oxygen content sensor 24, and the dew point thermometer 26 at the inner and outer spaces of the insulation module were monitored to evaluate the changes in structural moisture content during gas flow in both the inner and outer spaces of the insulation module. Subsequently, the set values ​​of the inner space high-pressure controller 28 and the outer space high-pressure controller 29 were adjusted to change the system pressure. The nitrogen remaining in the system was then extracted by opening the negative pressure extraction valve 2. Multiple repeated tests were conducted to obtain the test results of the gas flow performance in both the inner and outer spaces of the insulation module of the cryogenic enclosure system.

[0065] The specific embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A device for testing the airtightness and internal gas flow of a cryogenic insulation module, comprising an inlet / liquid inlet module, an outlet / liquid outlet module, and an insulation module. The inlet / liquid inlet module includes an inner space liquid nitrogen inlet valve, an outer space liquid nitrogen inlet valve, a low-pressure control module, an inner space high-pressure control module, an outer space high-pressure control module, a buffer tank, a pressure reducing valve, and a filter, all connected by pipes. The outlet / liquid outlet module includes a liquid nitrogen / nitrogen exhaust valve, an inner space exhaust valve, and an outer space exhaust valve, all connected by pipes. The outlets of the inner space liquid nitrogen inlet valve, the low-pressure control module, and the inner space high-pressure control module are connected in parallel to the inlet of the inner space of the insulation module. The outlets of the outer space high-pressure control module and the outer space... The outlet of the liquid nitrogen inlet valve is connected in parallel to the inlet of the outer space of the insulation module; the inlets of the low-pressure control module, the inner space high-pressure control module, and the outer space high-pressure control module are connected in parallel and sequentially connected to the buffer tank, the pressure reducing valve, and the filter before being connected to the nitrogen inlet port; the inlets of the inner space liquid nitrogen inlet valve and the outer space liquid nitrogen inlet valve are respectively connected to the liquid nitrogen inlet port; the outlet of the inner space of the insulation module is connected to the inlet of the inner space exhaust valve; the outlet of the outer space of the insulation module is connected to the inlet of the outer space exhaust valve; the outlets of the inner space exhaust valve and the outer space exhaust valve are connected in parallel and connected to the liquid nitrogen / nitrogen discharge port via the liquid nitrogen / nitrogen discharge valve. The exhaust / drainage module also includes a negative pressure suction valve. The outlets of the inner space exhaust valve and the outer space exhaust valve are connected in parallel through the pipe and connected to the negative pressure suction port through the negative pressure suction valve. The outlet of the inner space exhaust valve is connected to one end of the fifth pipe, the outlet of the outer space exhaust valve is connected to one end of the sixth pipe, and the other ends of the fifth pipe and the other ends of the sixth pipe are connected in parallel. The fifth pipe is equipped with an inner space outlet temperature sensor, an inner space outlet oxygen content sensor, and an inner space outlet dew point thermometer, while the sixth pipe is equipped with an outer space outlet temperature sensor, an outer space outlet oxygen content sensor, and an outer space outlet dew point thermometer.

2. The cryogenic insulation module airtightness and internal gas flow testing device as described in claim 1, wherein, The low-pressure control module includes a low-pressure controller outlet valve, a low-pressure controller inlet valve, and a low-pressure controller connected through the pipeline. The outlet of the low-pressure controller outlet valve serves as the outlet of the low-pressure control module. The low-pressure controller outlet valve is connected to the outlet of the low-pressure controller inlet valve via the low-pressure controller. The inlet of the low-pressure controller inlet valve serves as the inlet of the low-pressure control module.

3. The cryogenic insulation module airtightness and internal gas flow testing device as described in claim 2, wherein, The inner space high-pressure control module includes an inner space high-pressure controller outlet valve, an inner space high-pressure controller inlet valve, and an inner space high-pressure controller connected through the pipeline. The outlet of the inner space high-pressure controller outlet valve serves as the outlet of the inner space high-pressure control module. The inner space high-pressure controller outlet valve is connected to the outlet of the inner space high-pressure controller inlet valve via the inner space high-pressure controller. The inlet of the inner space high-pressure controller inlet valve serves as the inlet of the inner space high-pressure control module.

4. The test device for the airtightness and internal gas flow of a low-temperature insulation module as described in claim 3, wherein, The outer space high-pressure control module includes an outer space high-pressure controller outlet valve, an outer space high-pressure controller inlet valve, and an outer space high-pressure controller connected via the pipeline. The outlet of the outer space high-pressure controller outlet valve serves as the outlet of the outer space high-pressure control module. The outer space high-pressure controller outlet valve is connected to the outer space high-pressure controller inlet valve outlet via the outer space high-pressure controller. The inlet of the outer space high-pressure controller inlet valve serves as the inlet of the outer space high-pressure control module.

5. The test device for the airtightness and internal gas flow of a low-temperature insulation module as described in claim 1, wherein, The outlets of the inner space liquid nitrogen inlet valve, the low-pressure control module, and the inner space high-pressure control module are connected in parallel and connected to the inlet of the inner space of the insulation module via a first pipe and an inner space inlet metal hose; the outlets of the outer space high-pressure control module and the outer space liquid nitrogen inlet valve are connected in parallel and connected to the inlet of the outer space of the insulation module via a second pipe and an outer space inlet metal hose.

6. The cryogenic insulation module airtightness and internal gas flow testing device as described in claim 5, wherein, The inner space outlet of the insulation module is connected to the inlet of the inner space exhaust valve via a third pipe and an inner space outlet metal hose, and the outer space outlet of the insulation module is connected to the inlet of the outer space exhaust valve via a fourth pipe and an outer space outlet metal hose.

7. The cryogenic insulation module airtightness and internal gas flow testing device as described in claim 5, wherein, The first pipe is equipped with an inner space inlet pressure sensor and an inner space inlet temperature sensor; the second pipe is equipped with an outer space inlet pressure sensor and an outer space inlet temperature sensor.

8. The cryogenic insulation module airtightness and internal gas flow testing device as described in claim 7, wherein, The first pipeline is also equipped with an inner space inlet safety valve, and the second pipeline is also equipped with an outer space inlet safety valve.

9. The test device for the airtightness and internal gas flow of a cryogenic insulation module as described in claim 6, wherein, The third pipeline is equipped with an inner space outlet safety valve, and the fourth pipeline is equipped with an outer space outlet safety valve.

10. The cryogenic insulation module airtightness and internal gas flow testing device as described in claim 4, wherein, The negative pressure suction valve, the liquid nitrogen / nitrogen discharge valve, the inner space exhaust valve, the outer space exhaust valve, the inner space liquid nitrogen inlet valve, the low pressure controller outlet valve, the inner space high pressure controller outlet valve, the outer space high pressure controller outlet valve, and the outer space liquid nitrogen inlet valve are all cryogenic valves with an operating temperature of -196℃.

11. The cryogenic insulation module airtightness and internal gas flow testing device as described in claim 4, wherein, The inner space exhaust valve, the outer space exhaust valve, the inner space liquid nitrogen inlet valve, the low-pressure controller outlet valve, the inner space high-pressure controller outlet valve, the outer space high-pressure controller outlet valve, and the outer space liquid nitrogen inlet valve are all pneumatic valves.

12. The low-temperature insulation module airtightness and internal gas flow testing device as described in claim 4, wherein, The negative pressure extraction valve, the liquid nitrogen / nitrogen discharge valve, the low pressure controller inlet valve, the inner space high pressure controller inlet valve, and the outer space high pressure controller inlet valve are all solenoid valves.

13. The cryogenic insulation module airtightness and internal gas flow testing device as described in claim 4, wherein, The negative pressure suction valve, the liquid nitrogen / nitrogen discharge valve, the inner space exhaust valve, the outer space exhaust valve, the inner space liquid nitrogen inlet valve, the low pressure controller outlet valve, the low pressure controller inlet valve, the inner space high pressure controller outlet valve, the inner space high pressure controller inlet valve, the outer space high pressure controller outlet valve, the outer space high pressure controller inlet valve, and the outer space liquid nitrogen inlet valve are fixed to the pipeline by welding.

14. The cryogenic insulation module airtightness and internal gas flow testing device as described in claim 4, wherein, The low-pressure controller, the inner space high-pressure controller, the outer space high-pressure controller, and the pipeline are fixed together via a vacuum-connected radial sealing interface.

15. The cryogenic insulation module airtightness and internal gas flow testing device as described in claim 1, wherein, The oxygen content sensor at the inner space outlet, the dew point thermometer at the inner space outlet, the oxygen content sensor at the outer space outlet, the dew point thermometer at the outer space outlet, and the pipeline are fixed together by a vacuum-sealed radial interface.

16. The cryogenic insulation module airtightness and internal gas flow testing device as described in claim 7, wherein, The inner space inlet pressure sensor, the inner space inlet temperature sensor, the outer space inlet pressure sensor, and the outer space inlet temperature sensor are fixed to the pipeline by threaded connection.

17. The cryogenic insulation module airtightness and internal gas flow testing device as described in claim 6, wherein, The inner space inlet metal hose, the outer space inlet metal hose, the inner space outlet metal hose, and the outer space outlet metal hose are fixed to the insulation module via a vacuum connection radial sealing interface. The inner space inlet metal hose, the outer space inlet metal hose, the inner space outlet metal hose, and the outer space outlet metal hose are fixed to the first pipe, the second pipe, the third pipe, and the fourth pipe by welding.

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