Device for testing gas tightness and internal gas flow performance of low-temperature heat insulation module

Abstract

A device for testing gas tightness and internal gas flow performance of a low-temperature heat insulation module, comprising a gas inlet / liquid inlet module (200), a gas discharging / liquid discharging module (100), and a heat insulation module (1). The gas inlet / liquid inlet module (200) comprises an inner-layer space liquid nitrogen inlet valve (6), an outer-layer space liquid nitrogen inlet valve (13), a low-pressure pressure control module, an inner-layer space high-pressure pressure control module, an outer-layer space high-pressure pressure control module, a buffer tank (34), a pressure reducing valve (14), and a filter (35) which are connected by means of pipes. The gas discharging / liquid discharging module (100) comprises a liquid nitrogen / nitrogen gas discharging valve (3), an inner-layer space gas discharging valve (4), and an outer-layer space gas discharging valve (5) which are connected by means of pipes. An outlet of the gas inlet / liquid inlet module (200) is connected to an inlet of the heat insulation module (1), and an inlet of the gas discharging / liquid discharging module (100) is connected to an outlet of the heat insulation module (1). The device can achieve tightness inspection and adaptability research and testing and research of internal space gas flow performance of the heat insulation module (1) under a low-temperature working condition and a normal-temperature working condition.

Description

Low-temperature insulation module air tightness and internal gas fluidity testing device Technical Field

[0001] The present invention relates to the technical field of low-temperature thermal insulation module testing, and in particular to a device for testing the air tightness and internal gas fluidity of a low-temperature thermal insulation module. Background Art

[0002] The innovative development of storage and transportation systems and equipment for cryogenic working fluids (such as liquefied natural gas, liquid oxygen, liquid nitrogen, liquid hydrogen, liquid helium, etc.) is inseparable from the continuous research and innovative improvement of various cryogenic technologies such as insulation material performance testing, insulation structure design, and cryogenic performance testing. Cryogenic containment system performance testing is the basis for the verification of key technologies and core systems. Related technical research, research and development, prototype manufacturing, and verification all require the support of a cryogenic containment system performance testing system. Sealing performance in a low-temperature environment is an important technical indicator of the insulation module and an important guarantee for the safety performance of the cryogenic containment system during operation. At the same time, the internal space of the insulation module needs to have good gas flow performance in specific areas and directions to ensure good replacement capabilities for non-inert gases such as water vapor and oxygen. The main purpose of the low-temperature insulation module air tightness and internal gas flow test device is to carry out tightness inspection and adaptability research of the insulation module in a low-temperature environment and test and study the gas flow performance of the internal space, and to examine the change law of the internal space dew point temperature and structural water content during inert gas replacement, to provide guidance for the structural design, processing and installation process of the insulation module, to improve the reliability of independent research and development results, and to provide a technical basis 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 properties of cryogenic insulation modules. Therefore, there is a lack of technology for testing the airtightness and internal gas flow properties of cryogenic enclosure insulation modules under both low-temperature and normal-temperature conditions. To improve the level of testing and the reliability of test results for cryogenic enclosure system airtightness and internal gas flow properties, expand multi-condition testing capabilities, increase testing efficiency, and reduce testing costs, higher requirements are being placed on the development of testing equipment suitable for cryogenic insulation module airtightness and internal gas flow properties.

[0004] Therefore, technicians in this field are committed to developing a device suitable for testing the air tightness and internal space gas flow of low-temperature insulation modules, which can meet the needs of conducting tightness inspections and adaptability research and internal space gas flow performance testing and research on low-temperature insulation modules under low-temperature and normal temperature conditions.

[0005] Summary of the Invention

[0006] In view of the above-mentioned defects of the prior art, the technical problems to be solved by the present invention are:

[0007] 1. There is still a lack of testing technology for the tightness of the insulation module system of the low-temperature enclosure system under low-temperature conditions and normal temperature conditions, as well as the gas flow performance of the internal space;

[0008] 2. Testing the system tightness and internal gas flow performance of the insulation module of the cryogenic enclosure system under low-temperature and normal-temperature conditions requires multiple pressure gradients and independent pressure control;

[0009] 3. The enclosure system insulation module system tightness and internal space gas flow performance test includes -196℃ low temperature conditions;

[0010] 4. The test of the system tightness of the enclosure system insulation module and the gas flow performance of the internal space includes a combination of multiple test targets and multiple test conditions;

[0011] 5. The insulation modules of the enclosure system have many specifications and sizes, and the interface positions are different.

[0012] To achieve the above-mentioned objectives, the present invention provides a device for testing the air tightness and internal gas fluidity of a low-temperature insulation module, comprising an air intake / liquid intake module, an exhaust / liquid discharge module, and an insulation module, wherein the air intake / liquid intake module comprises an inner space liquid nitrogen inlet valve, an outer space liquid nitrogen inlet valve, a low-pressure pressure control module, an inner space high-pressure pressure control module, an outer space high-pressure pressure control module, a buffer tank, a pressure reducing valve, and a filter connected by a pipeline, the exhaust / liquid discharge module comprises a liquid nitrogen / nitrogen discharge valve, an inner space exhaust valve, and an outer space exhaust valve connected by a pipeline, the outlets of the inner space liquid nitrogen inlet valve, the low-pressure pressure control module, and the inner space high-pressure pressure control module are connected in parallel to the inlet of the inner space of the insulation module, the outer space high-pressure pressure control module, the The outlet of the outer space liquid nitrogen inlet valve is connected in parallel and connected to the inlet of the outer space of the insulation module; the inlets of the low-pressure pressure control module, the inner space high-pressure pressure control module, and the outer space high-pressure pressure control module are connected in parallel, and are sequentially connected to the buffer tank, the pressure reducing valve, and the filter, and then connected to the nitrogen inlet interface; 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 interface, the inner space outlet of the insulation module is connected to the inlet of the inner space exhaust valve, and 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 interface via the liquid nitrogen / nitrogen discharge valve.

[0013] Furthermore, the exhaust / liquid discharge module also includes a negative pressure exhaust valve, and 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 exhaust interface through the negative pressure exhaust valve.

[0014] Furthermore, the low-pressure pressure control module includes a low-pressure pressure controller outlet valve, a low-pressure pressure controller inlet valve, and a low-pressure pressure controller connected through the pipeline, the outlet of the low-pressure pressure controller outlet valve serves as the outlet of the low-pressure pressure control module, the low-pressure pressure controller outlet valve is connected to the outlet of the low-pressure pressure controller inlet valve via the low-pressure pressure controller, and the inlet of the low-pressure pressure controller inlet valve serves as the inlet of the low-pressure pressure control module.

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

[0016] Furthermore, the outer space high-pressure pressure control module includes an outer space high-pressure pressure controller outlet valve, an outer space high-pressure pressure controller inlet valve, and an outer space high-pressure pressure controller connected through the pipeline, the outlet of the outer space high-pressure pressure controller outlet valve serves as the outlet of the outer space high-pressure pressure control module, the outer space high-pressure pressure controller outlet valve is connected to the outlet of the outer space high-pressure pressure controller inlet valve via the outer space high-pressure pressure controller, and the inlet of the outer space high-pressure pressure controller inlet valve serves as the inlet of the outer space high-pressure pressure control module.

[0017] Furthermore, the outlets of the inner space liquid nitrogen inlet valve, the low-pressure pressure control module, and the inner space high-pressure pressure control module are connected in parallel, and are connected to the inlet of the inner space of the insulation module via a first pipeline and an inner space inlet metal hose; the outlets of the outer space high-pressure pressure control module and the outer space liquid nitrogen inlet valve are connected in parallel, and are connected to the inlet of the outer space of the insulation module via a second pipeline and an outer space inlet metal hose.

[0018] 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.

[0019] Furthermore, the outlet of the inner space exhaust valve is connected to one end of a fifth pipe, the outlet of the outer space exhaust valve is connected to one end of a sixth pipe, and the other end of the fifth pipe and the other end of the sixth pipe are connected in parallel.

[0020] Furthermore, the first pipeline is provided with an inner space inlet pressure sensor and an inner space inlet temperature sensor; the second pipeline is provided with an outer space inlet pressure sensor and an outer space inlet temperature sensor.

[0021] Furthermore, the first pipeline is provided with an inner space inlet safety valve, and the second pipeline is provided with an outer space inlet safety valve.

[0022] Furthermore, the third pipeline is provided with an inner space outlet safety valve, and the fourth pipeline is provided with an outer space outlet safety valve.

[0023] Furthermore, the fifth pipeline is provided 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 pipeline is provided with an outer space outlet temperature sensor, an outer space outlet oxygen content sensor, and an outer space outlet dew point thermometer.

[0024] Furthermore, the negative pressure exhaust 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 pressure controller outlet valve, the inner space high pressure pressure controller outlet valve, the outer space high pressure pressure controller outlet valve, and the outer space liquid nitrogen inlet valve are low-temperature valves with an operating temperature of -196°C.

[0025] Furthermore, the inner space exhaust valve, the outer space exhaust valve, the inner space liquid nitrogen inlet valve, the low-pressure pressure controller outlet valve, the inner space high-pressure pressure controller outlet valve, the outer space high-pressure pressure controller outlet valve, and the outer space liquid nitrogen inlet valve are pneumatic valves.

[0026] Furthermore, the negative pressure exhaust valve, the liquid nitrogen / nitrogen gas discharge valve, the low-pressure pressure controller air intake valve, the inner space high-pressure pressure controller air intake valve, and the outer space high-pressure pressure controller air intake valve are solenoid valves.

[0027] Furthermore, the negative pressure exhaust 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 pressure controller outlet valve, the low pressure pressure controller inlet valve, the inner space high pressure pressure controller outlet valve, the inner space high pressure pressure controller inlet valve, the outer space high pressure pressure controller outlet valve, the outer space high pressure pressure controller inlet valve, and the outer space liquid nitrogen inlet valve are fixed to the pipeline by welding.

[0028] Furthermore, the low-pressure pressure controller, the inner-space high-pressure pressure controller, the outer-space high-pressure pressure controller and the pipeline are fixed via a vacuum coupling radius (VCR) sealing interface.

[0029] Furthermore, the inner space outlet oxygen content sensor, the inner space outlet dew point thermometer, the outer space outlet oxygen content sensor, the outer space outlet dew point thermometer and the pipeline are fixed via a vacuum connection radial sealing interface.

[0030] 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 via threaded connection.

[0031] Furthermore, the first pipeline, the second pipeline, the third pipeline, and the fourth pipeline are stainless steel pipes.

[0032] 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 through 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.

[0033] Furthermore, the inner space and the outer space are continuous channels with sealed boundaries formed by seams of thermal insulation modules.

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] (1) Complete the establishment of testing technology for tightness and internal space gas flow performance under low temperature conditions (liquid nitrogen temperature zone) and normal temperature conditions (room temperature zone). The principle of low temperature fluid transportation process control is used to realize the system tightness and internal space gas flow performance testing of the low temperature containment system insulation module under different processes and test conditions. This fills the gap in the testing technology for tightness and internal space gas flow performance of the low temperature containment system insulation module under low temperature conditions (liquid nitrogen temperature zone) and normal temperature conditions (room temperature zone).

[0036] (2) Introducing a hierarchical precision pressure control technology, pressure control is achieved by connecting a pressure reducing valve in series with three sets of pressure controllers. The pressure reducing valve is connected in series with a high-precision pressure controller, and precise pressure control is achieved after the first stage of pressure reduction. The input pressures of low-temperature and normal-temperature fluids can also be independently controlled. This allows for independent and precise pressure control of the inner and outer spaces of the insulation module of the cryogenic enclosure system.

[0037] (3) Introducing liquid nitrogen input and process control technology. -196℃ liquid nitrogen flows directly into the insulation module of the enclosure system, and uses its own latent heat to exchange heat and cool the insulation module of the enclosure system. 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.

[0038] (4) Use a combination of valves and pressure controllers in parallel. By using valves to control the flow direction of the fluid, 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 carry out different test contents, improving test efficiency and reducing test costs.

[0039] (5) The main connection method of the low-temperature insulation module airtightness and internal gas flow test device is the type of metal hose and vacuum connection radial sealing interface. The space compensation characteristics of the metal hose are used to achieve compatibility with different enclosure system insulation module specifications and interface positions. The detachability of the VCR sealing interface is used to achieve the replacement of internal components of the device. It can realize the airtightness and internal space gas flow performance testing of low-temperature enclosure system insulation modules of different sizes and specifications, and the replacement of low-temperature enclosure system insulation module specimens is convenient and the disassembly and assembly are efficient.

[0040] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] FIG1 is a system composition diagram of an embodiment of the present invention;

[0042] FIG2 is a schematic structural diagram of an exhaust / drain module according to an embodiment of the present invention;

[0043] FIG3 is a schematic structural diagram of an air / liquid inlet module according to an embodiment of the present invention;

[0044] FIG4 is a schematic structural diagram of a thermal insulation module according to an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The following describes preferred embodiments of the present invention with reference to the accompanying drawings to make the present invention clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0046] In the drawings, components with the same structure are denoted by the same numerical numerals, and components with similar structure or function are denoted by similar numerical numerals.

[0047] This embodiment provides a system that can be used to test the air tightness and internal space gas flow performance of a low-temperature enclosure system.

[0048] Negative pressure exhaust valve 2, liquid nitrogen / nitrogen discharge valve 3, inner space exhaust valve 4, outer space exhaust valve 5, inner space liquid nitrogen inlet valve 6, low pressure pressure controller outlet valve 7, low pressure pressure controller inlet valve 8, inner space high pressure pressure controller outlet valve 9, inner space high pressure pressure controller inlet valve 10, outer space high pressure pressure controller outlet valve 11, outer space high pressure pressure controller inlet valve 12, outer space liquid nitrogen inlet valve 13, pressure reducing valve 14, inner space outlet pressure sensor 15, outer space outlet pressure sensor 16. The inlet pressure sensor 16, the inner space inlet pressure sensor 17, the outer space inlet pressure sensor 18, the inner space outlet temperature sensor 19, the outer space outlet temperature sensor 20, the inner space inlet temperature sensor 21, the outer space inlet temperature sensor 22, the inner space outlet oxygen content sensor 23, the outer space outlet oxygen content sensor 24, the inner space outlet dew point thermometer 25, the outer space outlet dew point thermometer 26, the low pressure pressure controller 27, the inner space high pressure pressure controller 28, the outer space high pressure pressure controller 29, the inner space outlet safety valve 30, the outer space outlet safety valve 31, the inner space inlet safety valve 32, the outer space inlet safety valve 33, the buffer tank 34, and the filter 35 are respectively connected by pipelines as shown in Figures 1 to 4, and then connected to the insulation module 1 through the inner space outlet metal hose 36, the outer space outlet metal hose 37, the inner space inlet metal hose 38, and the outer space inlet metal hose 39. 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; 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, outer-space liquid nitrogen inlet valve 13, low-pressure control module, inner-space high-pressure control module, outer-space high-pressure control module, buffer tank 34, pressure reducing valve 14, and filter 35 form an air / liquid inlet module 200; the negative pressure exhaust valve 2, liquid nitrogen / nitrogen gas discharge valve 3, inner-space exhaust valve 4, and outer-space exhaust valve 5 form an exhaust / liquid discharge module 100. The outlet of the air / liquid inlet module 200 is connected to the inlet of the thermal insulation module 1 , and the inlet of the air / liquid discharge module 100 is connected to the outlet of the thermal insulation module 1 .

[0049] The outlets of the low-pressure pressure controller outlet valve 7, the inner-space liquid nitrogen inlet valve 6, and the inner-space high-pressure pressure controller outlet valve 9 are connected in parallel to a first pipeline 40. The first pipeline 40 is connected to the inlet of the inner space 46 via an inner-space inlet metal hose 38. The outlets of the outer-space high-pressure 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, the other end of which is connected to the inlet of the inner-space exhaust valve 4 via a third pipeline 42. The outlet of the inner-space exhaust valve 4 is connected to the negative pressure exhaust valve 2 and the liquid nitrogen / nitrogen gas discharge valve 3 via a fifth pipeline 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, and the outlet of the outer space exhaust valve 5 is connected to the negative pressure exhaust valve 2 and the liquid nitrogen / nitrogen discharge valve 3 through the sixth pipe 45.

[0050] All valves and pipelines are fixed by welding, all pressure controllers, all dew point thermometers, all oxygen content sensors and pipelines are fixed by VCR sealing interfaces, all pressure sensors, temperature sensors and pipelines are fixed by threaded connections, all metal hoses and insulation modules are fixed by VCR sealing interfaces, and all metal hoses and pipelines are fixed by welding.

[0051] Negative pressure exhaust valve 2, liquid nitrogen / nitrogen discharge valve 3, inner space exhaust valve 4, outer space exhaust valve 5, inner space liquid nitrogen inlet valve 6, low pressure pressure controller outlet valve 7, inner space high pressure pressure controller outlet valve 9, outer space high pressure pressure controller outlet valve 11, and outer space liquid nitrogen inlet valve 13 are low-temperature valves with an operating temperature of -196°C.

[0052] The inner space exhaust valve 4, outer space exhaust valve 5, inner space liquid nitrogen inlet valve 6, low pressure pressure controller outlet valve 7, inner space high pressure pressure controller outlet valve 9, outer space high pressure pressure controller outlet valve 11, and outer space liquid nitrogen inlet valve 13 are pneumatic valves, and the negative pressure exhaust valve 2, liquid nitrogen / nitrogen discharge valve 3, low pressure pressure controller inlet valve 8, inner space high pressure pressure controller inlet valve 10, and outer space high pressure pressure controller inlet valve 12 are solenoid valves.

[0053] This embodiment can realize at least five working processes:

[0054] a. Low temperature enclosure system insulation module normal temperature (room temperature zone) tightness test mode:

[0055] By opening the low-pressure controller outlet valve 7 and the low-pressure controller inlet valve 8 and closing the inner space exhaust valve 4, the nitrogen passes through the filter 35 and is reduced in pressure by the pressure reducing valve 14. It then enters the buffer tank 34 to stabilize the flow. After precise pressure control by the low-pressure controller 27, it enters the inner space of the insulation module 1. After the pressure stabilizes, the system pressure changes are monitored via the inner space outlet pressure sensor 15 and the inner space inlet pressure sensor 17. Subsequently, the value of the low-pressure controller 27 is adjusted to change the system pressure, and repeated tests with multiple values ​​are conducted to obtain the room-temperature tightness test results of the low-temperature enclosure system insulation module.

[0056] b. Pre-cooling mode of thermal insulation module of low temperature enclosure system:

[0057] 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, closing the low-pressure pressure controller outlet valve 7, the inner space high-pressure pressure controller outlet valve 9, the outer space high-pressure pressure controller outlet valve 11, and the negative pressure exhaust valve 2, and adjusting the opening of the inner space liquid nitrogen inlet valve 6 and the outer space liquid nitrogen inlet valve 13, liquid nitrogen is slowly introduced into the insulation module 1, and 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 indicated by the inner space outlet temperature sensor 19 and the outer space outlet temperature sensor 20 reach the liquid nitrogen temperature zone, it can be considered that the pre-cooling of the enclosure system insulation module is completed.

[0058] c. Low temperature (liquid nitrogen temperature zone) tightness test mode of low temperature enclosure system insulation module:

[0059] After pre-cooling of the insulation module 1 is complete, the low-pressure controller outlet valve 7 and the low-pressure controller inlet valve 8 are opened, and the inner space exhaust valve 4, the inner space liquid nitrogen inlet valve 6, and the outer space liquid nitrogen inlet valve 13 are closed. Nitrogen passes through the filter 35 and is reduced in pressure by the pressure reducing valve 14. It then enters the buffer tank 34 to stabilize the flow. After precise pressure control by the low-pressure controller 27, it enters the inner space of the insulation module 1. Once the pressure stabilizes, the pressure changes within the system are monitored by the inner space outlet pressure sensor 15 and the inner space inlet pressure sensor 17. Subsequently, the value of the 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 cryogenic enclosure system.

[0060] d. Test mode for gas flow performance in the inner space of the insulation module of the low-temperature enclosure system:

[0061] By opening the liquid nitrogen / nitrogen discharge valve 3, the inner space exhaust valve 4, the inner space high-pressure pressure controller outlet valve 9, and the inner space high-pressure pressure controller inlet valve 10, and closing the low-pressure pressure controller outlet valve 7, the outer space exhaust valve 5, the negative pressure exhaust valve 2, the inner space liquid nitrogen inlet valve 6, the outer space liquid nitrogen inlet valve 13, and the outer space high-pressure pressure controller outlet valve 11, and 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 precise pressure control of the inner space high-pressure pressure controller 28, constant pressure nitrogen is allowed to enter the inner space inside the insulation module 1. At the same time, the values ​​of the inner space outlet oxygen content sensor 23 and the inner space outlet dew point thermometer 25 are monitored to evaluate the changes in the structural water content during the gas flow process inside the insulation module 1. Subsequently, the setting value of the inner space high-pressure pressure controller 28 is adjusted to change the system pressure, and the nitrogen remaining inside the system is extracted by opening the negative pressure exhaust valve 2. Multiple value repeated tests are carried out to obtain the test results of the gas flow performance of the inner space inside the low-temperature enclosure system.

[0062] e. Test mode for gas flow performance in the outer space inside the insulation module of the cryogenic enclosure system:

[0063] By opening the outer space exhaust valve 5, the liquid nitrogen / nitrogen discharge valve 3, the outer space high-pressure pressure controller outlet valve 11, and the outer space high-pressure pressure controller inlet valve 12, and closing the inner space exhaust valve 4, the negative pressure exhaust valve 2, the inner space liquid nitrogen inlet valve 6, the low-pressure pressure controller outlet valve 7, the inner space high-pressure pressure controller outlet valve 9, and the outer space liquid nitrogen inlet valve 13, the nitrogen pressure entering the system is initially reduced by adjusting the pressure reducing valve 14 and stabilized by the buffer tank 34. Subsequently, by setting the outer space high-pressure pressure controller 29 for precise pressure control, constant pressure nitrogen is allowed to enter 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 changes in the structural water content during the gas flow process in the outer space inside the insulation module 1. Subsequently, the set value of the outer space high-pressure pressure controller 29 is adjusted to change the system pressure, and the nitrogen remaining inside the system is extracted by opening the negative pressure exhaust valve 2. Multiple value repeated tests are carried out to obtain the test results of the outer space gas flow performance inside the low-temperature enclosure system.

[0064] f. Parallel test mode for gas flow performance between the inner space inside the insulation module and the outer space inside the insulation module of the low-temperature enclosure system:

[0065] By opening the liquid nitrogen / nitrogen discharge valve 3, the inner space exhaust valve 4, the outer space exhaust valve 5, the inner space high-pressure pressure controller outlet valve 9, the inner space high-pressure pressure controller inlet valve 10, the outer space high-pressure pressure controller outlet valve 11, and the outer space high-pressure pressure controller inlet valve 12, closing the negative pressure exhaust valve 2, the inner space liquid nitrogen inlet valve 6, the low pressure 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 is carried out through the buffer tank 34. After the pressure stabilizes, precise pressure control is then performed by setting the inner space high-pressure pressure controller 28 and the outer space high-pressure pressure controller 29 to allow constant-pressure nitrogen to enter the inner space and the outer space of the insulation module. At the same time, the values ​​of the inner space outlet oxygen content sensor 23, the inner space outlet dew point thermometer 25, the outer space outlet oxygen content sensor 24, and the outer space outlet dew point thermometer 26 are monitored to evaluate the changes in the structural moisture content during the gas flow process in the inner space and the outer space of the insulation module 1. Subsequently, the values ​​set on the inner space high-pressure pressure controller 28 and the outer space high-pressure pressure controller 29 are adjusted to change the system pressure, and the nitrogen remaining in the system is extracted by opening the negative pressure exhaust valve 2. Multiple repeated tests are carried out to obtain the test results of the gas flow performance of the inner space and the outer space of the insulation module of the low-temperature enclosure system.

[0066] The above describes in detail the specific embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A test device for the airtightness and internal gas fluidity of a cryogenic insulation module, comprising an air inlet / liquid inlet module, an exhaust / drainage module, and an insulation module. The air inlet / liquid inlet module includes an inner space liquid nitrogen inlet valve, an outer space liquid nitrogen inlet valve, a low-pressure pressure control module, an inner space high-pressure pressure control module, an outer space high-pressure pressure control module, a buffer tank, a pressure reducing valve, and a filter connected by pipelines. The exhaust / drainage module includes a liquid nitrogen / nitrogen discharge valve, an inner space exhaust valve, and an outer space exhaust valve connected by pipelines. The outlets of the inner space liquid nitrogen inlet valve, the low-pressure pressure control module, and the inner space high-pressure pressure control module are connected in parallel and connected to the inlet of the inner space of the insulation module. The outlets of the outer space high-pressure 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. The inlets of the low-pressure pressure control module, the inner space high-pressure pressure control module, and the outer space high-pressure pressure control module are connected in parallel, and are sequentially connected to the buffer tank, the pressure reducing valve, and the filter, and then connected to the nitrogen inlet interface. 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 interface. The outlet of the inner space of the insulation module is connected to the inlet of the inner space exhaust valve, and 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 are connected to the liquid nitrogen / nitrogen discharge interface through the liquid nitrogen / nitrogen discharge valve.

2. The airtightness and internal gas fluidity testing device for the cryogenic insulation module according to claim 1, wherein, The exhaust / drainage module further includes a negative pressure air extraction valve. The outlets of the inner space exhaust valve and the outer space exhaust valve are connected in parallel through the pipeline and are connected to the negative pressure air extraction interface through the negative pressure air extraction valve.

3. The airtightness and internal gas fluidity testing device for the cryogenic insulation module according to claim 2, wherein, The low-pressure pressure control module includes a low-pressure pressure controller outlet valve, a low-pressure pressure controller inlet valve, and a low-pressure pressure controller connected by the pipeline. The outlet of the low-pressure pressure controller outlet valve serves as the outlet of the low-pressure pressure control module. The outlet of the low-pressure pressure controller outlet valve is connected to the outlet of the low-pressure pressure controller inlet valve through the low-pressure pressure controller. The inlet of the low-pressure pressure controller inlet valve serves as the inlet of the low-pressure pressure control module.

4. The low-temperature adiabatic module airtightness and internal gas fluidity test device according to claim 3, wherein, The inner space high-pressure pressure control module includes an inner space high-pressure pressure controller outlet valve, an inner space high-pressure pressure controller inlet valve, and an inner space high-pressure pressure controller connected by the pipeline. The outlet of the inner space high-pressure pressure controller outlet valve serves as the outlet of the inner space high-pressure pressure control module. The outlet of the inner space high-pressure pressure controller outlet valve is connected to the outlet of the inner space high-pressure pressure controller inlet valve through the inner space high-pressure pressure controller. The inlet of the inner space high-pressure pressure controller inlet valve serves as the inlet of the inner space high-pressure pressure control module.

5. The airtightness and internal gas fluidity test device for the cryogenic insulation module according to claim 4, wherein, The outer space high-pressure pressure control module includes an outer space high-pressure pressure controller outlet valve, an outer space high-pressure pressure controller inlet valve, and an outer space high-pressure pressure controller connected through the pipeline. The outlet of the outer space high-pressure pressure controller outlet valve serves as the outlet of the outer space high-pressure pressure control module. The outlet of the outer space high-pressure pressure controller outlet valve is connected to the outlet of the outer space high-pressure pressure controller inlet valve through the outer space high-pressure pressure controller. The inlet of the outer space high-pressure pressure controller inlet valve serves as the inlet of the outer space high-pressure pressure control module.

6. The airtightness and internal gas fluidity testing device for the cryogenic insulation module according to claim 1, wherein, The outlets of the inner space liquid nitrogen inlet valve, the low-pressure pressure control module, and the inner space high-pressure pressure control module are connected in parallel and are connected to the inlet of the inner space of the adiabatic module through the first pipeline and the inner space inlet metal hose; the outlets of the outer space high-pressure pressure control module and the outer space liquid nitrogen inlet valve are connected in parallel and are connected to the inlet of the outer space of the adiabatic module through the second pipeline and the outer space inlet metal hose.

7. The airtightness and internal gas fluidity testing device for the cryogenic insulation module according to claim 6, wherein, The outlet of the inner space of the adiabatic module is connected to the inlet of the inner space exhaust valve through the third pipeline and the inner space outlet metal hose, and the outlet of the outer space of the adiabatic module is connected to the inlet of the outer space exhaust valve through the fourth pipeline and the outer space outlet metal hose.

8. The airtightness and internal gas fluidity testing device for the cryogenic insulation module according to claim 1, wherein, The outlet of the inner space exhaust valve is connected to one end of the fifth pipeline, and the outlet of the outer space exhaust valve is connected to one end of the sixth pipeline. The other ends of the fifth pipeline and the sixth pipeline are connected in parallel.

9. The airtightness and internal gas fluidity testing device for the cryogenic insulation module according to claim 6, wherein, An inner space inlet pressure sensor and an inner space inlet temperature sensor are provided on the first pipeline; an outer space inlet pressure sensor and an outer space inlet temperature sensor are provided on the second pipeline.

10. The airtightness and internal gas fluidity testing device for the cryogenic insulation module according to claim 9, wherein, An inner space inlet safety valve is further provided on the first pipeline, and an outer space inlet safety valve is further provided on the second pipeline.

11. The airtightness and internal gas fluidity testing device for the cryogenic insulation module according to claim 7, wherein, An inner space outlet safety valve is provided on the third pipeline, and an outer space outlet safety valve is provided on the fourth pipeline.

12. The airtightness and internal gas fluidity testing device for the cryogenic insulation module according to claim 8, wherein, An inner space outlet temperature sensor, an inner space outlet oxygen content sensor, and an inner space outlet dew point thermometer are provided on the fifth pipeline, and an outer space outlet temperature sensor, an outer space outlet oxygen content sensor, and an outer space outlet dew point thermometer are provided on the sixth pipeline.

13. The airtightness and internal gas fluidity test device for the cryogenic insulation module according to claim 5, wherein, The negative pressure extraction 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 pressure controller outlet valve, the inner space high-pressure pressure controller outlet valve, the outer space high-pressure pressure controller outlet valve, and the outer space liquid nitrogen inlet valve are cryogenic valves with an operating temperature of -196°C.

14. The airtightness and internal gas fluidity testing device for the cryogenic insulation module according to claim 5, wherein, The inner space exhaust valve, the outer space exhaust valve, the inner space liquid nitrogen inlet valve, the low-pressure pressure controller outlet valve, the inner space high-pressure pressure controller outlet valve, the outer space high-pressure pressure controller outlet valve, and the outer space liquid nitrogen inlet valve are pneumatic valves.

15. The airtightness and internal gas fluidity test device for the cryogenic insulation module according to claim 5, wherein, The negative pressure air extraction valve, the liquid nitrogen / nitrogen discharge valve, the inlet valve of the low-pressure pressure controller, the inlet valve of the high-pressure pressure controller for the inner space, and the inlet valve of the high-pressure pressure controller for the outer space are solenoid valves.

16. The airtightness and internal gas fluidity test device for the cryogenic insulation module according to claim 5, wherein, The negative pressure air extraction valve, the liquid nitrogen / nitrogen discharge valve, the exhaust valve for the inner space, the exhaust valve for the outer space, the liquid nitrogen inlet valve for the inner space, the outlet valve of the low-pressure pressure controller, the inlet valve of the low-pressure pressure controller, the outlet valve of the high-pressure pressure controller for the inner space, the inlet valve of the high-pressure pressure controller for the inner space, the outlet valve of the high-pressure pressure controller for the outer space, the inlet valve of the high-pressure pressure controller for the outer space, and the liquid nitrogen inlet valve for the outer space are fixed to the pipeline by welding.

17. The airtightness and internal gas fluidity test device for the cryogenic insulation module according to claim 5, wherein, The low-pressure pressure controller, the high-pressure pressure controller for the inner space, and the high-pressure pressure controller for the outer space are fixed to the pipeline through vacuum connection radial sealing interfaces.

18. The airtightness and internal gas fluidity test device for the cryogenic insulation module according to claim 12, wherein, The oxygen content sensor at the outlet of the inner space, the dew point thermometer at the outlet of the inner space, the oxygen content sensor at the outlet of the outer space, and the dew point thermometer at the outlet of the outer space are fixed to the pipeline through vacuum connection radial sealing interfaces.

19. The airtightness and internal gas fluidity test device for the cryogenic insulation module according to claim 9, wherein, The pressure sensor at the inlet of the inner space, the temperature sensor at the inlet of the inner space, the pressure sensor at the inlet of the outer space, and the temperature sensor at the inlet of the outer space are fixed to the pipeline by threaded connection.

20. The airtightness and internal gas fluidity test device for the cryogenic insulation module according to claim 7, wherein, The metal hose at the inlet of the inner space, the metal hose at the inlet of the outer space, the metal hose at the outlet of the inner space, and the metal hose at the outlet of the outer space are fixed to the adiabatic module through vacuum connection radial sealing interfaces, and the metal hose at the inlet of the inner space, the metal hose at the inlet of the outer space, the metal hose at the outlet of the inner space, and the metal hose at the outlet of the outer space are fixed to the first pipeline, the second pipeline, the third pipeline, and the fourth pipeline by welding.

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