Heat leakage test system for low-temperature transmission pipeline

Abstract

The utility model discloses a heat leakage test system for a low-temperature transmission pipeline, which is characterized by comprising a data processing unit, a main valve box, a rear connecting box, an exhaust measuring device and a test sample section, the main valve box is hermetically connected with the exhaust measuring device through the test sample section; low-temperature working medium input and output pipelines and cold shield medium input and output pipelines are arranged in the main valve box; a low-temperature valve, a heater, a pressure transmitter, a temperature sensor and a safety valve are arranged on the low-temperature working medium input pipeline; the low-temperature transmission pipeline to be subjected to heat leakage test in the test sample section and the low-temperature working medium loop pipeline in the rear connecting box form a low-temperature working medium transmission channel; a cold shield medium transmission channel is arranged to provide a cold shield for the low-temperature working medium transmission channel; the low-temperature working medium output pipeline is connected with the recycling air bag through the exhaust measuring device and is used for recycling the low-temperature working medium; the data processing unit calculates the enthalpy of the low-temperature working medium at the outlet and the enthalpy of the inlet of the low-temperature transmission pipeline according to the temperature and the pressure, and obtains the heat leakage value through the enthalpy difference.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of low temperature engineering, more particularly to a kind of low temperature transmission pipeline heat leakage test system. BACKGROUND

[0002] Low temperature transmission pipeline is widely used in various low temperature systems, to transmit cryogenic working medium, and its main feature is that heat leakage is small. There is temperature difference between low temperature working medium and environment, and heat transfer is carried out through conduction, thermal radiation and other mechanisms. The design of low temperature transmission pipeline is mainly to effectively reduce heat leakage by reducing heat transfer, and the size of heat leakage is one of important indexes for evaluating low temperature transmission pipeline. Accurate measurement of the heat leakage of low temperature transmission pipeline helps to optimize the process design of low temperature system, system layout and selection of core equipment, so the measurement of low temperature pipeline heat leakage is particularly important.

[0003] Low temperature transmission pipeline is mainly divided into single-channel transmission pipeline and multi-channel transmission pipeline, and the working medium transmitted generally includes low temperature liquid and low temperature gas, and the working medium state mainly includes supercooled state, saturated state, two-phase flow and gaseous state. Different working medium phases have different heat leakages when flowing in multi-channel transmission pipeline. In addition, compared with single-channel transmission pipeline, the inner tube layout, temperature gradient distribution, heat insulation material wrapping and cold screen arrangement in multi-channel transmission pipeline also affect the heat leakage of pipeline, so the measurement of low temperature pipeline heat leakage helps the fluid working medium distribution and structure design of low temperature transmission pipeline.

[0004] Due to the importance of low temperature transmission pipeline heat leakage test, it is necessary to provide a set of low temperature transmission pipeline heat leakage test system which is accurate, easy to operate and widely applicable. UTILITY MODEL CONTENT

[0005] In view of the above analysis, the utility model aims at providing a kind of low temperature transmission pipeline heat leakage test system to solve the problems in the above background technology introduction.

[0006] The technical scheme of the utility model is:

[0007] A kind of low temperature transmission pipeline heat leakage test system, characterized by, including data processing unit, main valve box 001, rear connection box 002, exhaust measuring device 003, test sample section 004;The main valve box 001 is connected with the exhaust measuring device 003 by the test sample section 004 in airtight connection;

[0008] The main valve box 001 is provided with a low-temperature working medium input pipeline, a low-temperature working medium output pipeline, a cold screen medium input pipeline and a cold screen medium output pipeline; the low-temperature valve 005 is arranged on the low-temperature working medium input pipeline, which is used to control the flow rate q of the low-temperature working medium transmitted in the low-temperature transmission pipeline; the heater 006 is arranged on the low-temperature working medium input pipeline, which is used to control the temperature of the low-temperature working medium transmitted in the low-temperature transmission pipeline; the pressure transmitter 007 is arranged on the low-temperature working medium input pipeline, which is used to measure the pressure P of the low-temperature working medium transmitted in the low-temperature transmission pipeline; the temperature sensor 008 is arranged on the low-temperature working medium input pipeline, which is used to measure the temperature T of the low-temperature working medium transmitted in the low-temperature transmission pipeline;

[0009] The test sample section 004 is provided with two low-temperature transmission pipelines for testing heat leakage, and the rear connecting box 002 is provided with a low-temperature working medium loop pipeline; one end of each of the two low-temperature transmission pipelines is connected with the low-temperature working medium input pipeline and the low-temperature working medium output pipeline respectively, and the other end of each of the two low-temperature transmission pipelines is connected with two ends of the low-temperature working medium loop pipeline respectively, so as to form a low-temperature working medium transmission channel; the two ends of each of the low-temperature transmission pipelines are provided with the temperature sensor 008, which is used to measure the temperature difference of the low-temperature working medium in the low-temperature transmission pipeline; the heater 006 is arranged in the rear connecting box 002, which is used to control the temperature of the low-temperature working medium transmitted in the low-temperature working medium loop pipeline;

[0010] The test sample section 004 is provided with two low-temperature transmission pipelines for testing heat leakage, and the rear connecting box 002 is provided with a low-temperature working medium loop pipeline; one end of each of the two low-temperature transmission pipelines is connected with the low-temperature working medium input pipeline and the low-temperature working medium output pipeline respectively, and the other end of each of the two low-temperature transmission pipelines is connected with two ends of the low-temperature working medium loop pipeline respectively, so as to form a low-temperature working medium transmission channel; the two ends of each of the low-temperature transmission pipelines are provided with the temperature sensor 008, which is used to measure the temperature difference of the low-temperature working medium in the low-temperature transmission pipeline; the heater 006 is arranged in the rear connecting box 002, which is used to control the temperature of the low-temperature working medium transmitted in the low-temperature working medium loop pipeline;

[0011] The low-temperature working medium output pipeline is connected with the recovery airbag 014 through the exhaust measuring device 003, which is used to realize the recovery of the low-temperature working medium;

[0012] The data processing unit is used to obtain the enthalpy h of the low-temperature working medium at the outlet of the low-temperature transmission pipeline according to the temperature T and the pressure P of the low-temperature working medium in the low-temperature transmission pipeline out , and the enthalpy h of the low-temperature working medium at the inlet of the low-temperature transmission pipeline in , and the heat leakage value Q of the low-temperature transmission pipeline is calculated through the formula .

[0013] Further, the safety valve 009 is arranged on the low-temperature working medium input pipeline, which is used to start when the pressure P reaches the take-off pressure threshold value, so as to realize the safety protection of the low-temperature transmission pipeline heat leakage test.

[0014] Further, the cold screen medium input pipeline is provided with a low temperature valve 005, a heater 006, a pressure transmitter 007, a temperature sensor 008.

[0015] Further, the main valve box 001 is provided with a standby input pipeline and a standby output pipeline; the standby input pipeline is provided with a low temperature valve 005, a heater 006, a pressure transmitter 007, a temperature sensor 008 and a safety valve 009; the test sample section 004 is provided with two standby transmission pipelines, and the rear connection box 002 is provided with a standby loop pipeline; one end of the two standby transmission pipelines can be connected with the standby input pipeline and the standby output pipeline through corrugated pipes respectively, and the other end of the two standby transmission pipelines can be connected with two ends of the standby loop pipeline through corrugated pipes respectively, forming a standby transmission channel.

[0016] Further, the exhaust measuring device 003 contains an exhaust pipeline, and the exhaust pipeline is provided with a heater 006, a pressure transmitter 007, a temperature sensor 008, a normal temperature valve 013 and a flow controller 010.

[0017] Further, the cold screen medium transmitted in the cold screen medium input pipeline is two-phase flow or gaseous nitrogen working medium; and the low temperature working medium is low temperature gaseous helium working medium.

[0018] Further, the heater 006 in the rear connection box 002 is arranged on the low temperature working medium loop pipeline; and the cold screen medium loop pipeline is provided with a heater 006 for controlling the temperature of the cold screen medium transmitted in the cold screen medium loop pipeline.

[0019] Further, the main valve box 001 and the rear connection box 002 are vacuum containers.

[0020] Further, one end of the two low temperature transmission pipelines is connected with the low temperature working medium input pipeline and the low temperature working medium output pipeline through corrugated pipes respectively, and the other end of the two low temperature transmission pipelines is connected with two ends of the low temperature working medium loop pipeline through corrugated pipes respectively, forming a low temperature working medium transmission channel; one end of the two cold screen medium transmission pipelines is connected with the cold screen medium input pipeline and the cold screen medium output pipeline through corrugated pipes respectively, and the other end of the two cold screen medium transmission pipelines is connected with two ends of the cold screen medium loop pipeline through corrugated pipes respectively, forming a cold screen medium transmission channel.

[0021] The low temperature transmission pipeline heat leakage test system of the application comprises a data processing unit, a main valve box 001, a rear connection box 002, an exhaust measuring device 003 and a test sample section 004; the main valve box 001 is in sealed connection with the exhaust measuring device 003 through the test sample section 004.

[0022] The main valve box 001 is used for integrating pipelines, low-temperature valves 005, heaters 006, pressure transmitters 007, temperature sensors 008 and safety valves 009 to realize the transmission and flow, temperature (T) and pressure (P) control of low-temperature working medium.

[0023] The main valve box 001 is provided with three low-temperature valves 005 for adjusting the flow and pressure of low-temperature fluid in each pipeline.

[0024] The main valve box 001 is provided with heaters 006 for adjusting and controlling the inflow temperature of low-temperature fluid in the pipeline.

[0025] The main valve box 001 is provided with pressure transmitters 007 and temperature sensors 008 for monitoring the pressure and temperature of low-temperature fluid in the pipeline.

[0026] The main valve box 001 is provided with safety valves 009 for taking off when the pressure of low-temperature fluid in the pipeline reaches the take-off pressure threshold to realize the safety protection of the system.

[0027] The main valve box 001 is provided with an injection port 012 for filling the corresponding low-temperature working medium input pipeline of cold screen medium; the cold screen medium input pipeline adopts a pipeline with a specification of DN20, the input port inputs liquid nitrogen (LN2) mainly as the cold screen of the test sample section, the cold screen medium output pipeline adopts a pipeline with a specification of DN40, the outlet is empty, the low-temperature working medium input pipeline for testing heat leakage is a pipeline with a specification of DN32, and the low-temperature working medium output pipeline is a pipeline with a specification of DN50, which is connected to the exhaust measurement device 003.

[0028] The main valve box 001 is provided with a standby injection port 011, which adopts a standby input pipeline and a standby output pipeline with a specification of DN50, whether to use is determined according to the structure of the test sample section.

[0029] The rear connection box 002 is used to connect the test sample section 004, and the built-in heater 006 is used to control the back gas temperature; the rear connection box 002 is provided with a heater 006 for adjusting and controlling the backflow temperature of low-temperature fluid in the pipeline.

[0030] The exhaust measurement device 003 is used to integrate the back gas pipeline, the heater 006, the pressure transmitter 007, the temperature sensor 008, the flow controller 010 and the normal-temperature valve 013 to realize the control of the outlet fluid.

[0031] The data processing unit is used to obtain the enthalpy h out of the low-temperature working medium at the outlet of the low-temperature transmission pipeline and the enthalpy h in of the low-temperature working medium at the inlet of the low-temperature transmission pipeline according to the temperature T and the pressure P of the low-temperature working medium in the low-temperature transmission pipeline, and calculate the heat leakage value Q of the low-temperature transmission pipeline through the formula .

[0032] The exhaust measuring device 003 is provided with a heater 006 for heating the discharged low-temperature fluid to ensure that the exhaust temperature is greater than zero degrees.

[0033] The exhaust measuring device 003 is provided with a pressure transmitter 007 and a temperature sensor 008 for monitoring the pressure and temperature of the exhaust.

[0034] The exhaust measuring device 003 is provided with a flow controller 010 and a normal-temperature valve 013 for measuring, adjusting and controlling the flow of fluid in the pipeline.

[0035] The outlet pipeline of the exhaust measuring device 003 is connected to a recovery airbag 014 for realizing helium recovery.

[0036] The test sample section 004 is internally provided with a low-temperature transmission pipeline to be tested for heat leakage as a core pipeline, which is provided with a temperature sensor 008 for measuring the temperature difference of the fluid in the pipeline to facilitate calculation of the pipeline heat leakage.

[0037] The test sample section 004 is further provided with a cold screen medium input pipeline, which plays a cold screen role to reduce the heat leakage of the core pipeline.

[0038] The test sample section 004 is further provided with two standby transmission pipelines.

[0039] Further, the main valve box 001 is a vacuum container that can control the temperature and flow of the low-temperature fluid.

[0040] Further, the rear connection box 002 is a vacuum container that can control the backflow temperature of the low-temperature fluid.

[0041] Further, the exhaust measuring device 003 can ensure that the exhaust temperature is greater than zero degrees to avoid icing and condensation, and can also cooperatively control the flow of fluid in the pipeline.

[0042] Further, the heat leakage of the low-temperature transmission pipeline to be tested for heat leakage is measured by measuring the temperature and pressure to obtain the enthalpy of the fluid, and the heat leakage of the low-temperature transmission pipeline is obtained by the enthalpy and mass flow of the fluid.

[0043] Further, to protect the system safety, the safety valve 009 has a trip pressure threshold of 4.5 bara. Considering the flow range and measurement accuracy of the low-temperature transmission pipeline, the control range of the flow controller is 0-10 g / s.

[0044] Further, the temperature control range of the main valve box 001 is 5-60K, and the temperature control range of the rear connection box is 40-90K. When the temperature of the main valve box 001 is greater than 5K, the low-temperature fluid is generally gaseous, and there is no phase change in the transmission process, which is easy to measure; when the temperature is too high, for example, greater than 90K, it is not meaningful to measure the heat leakage.

[0045] Further, the outlet pipeline of the main valve box 001 and the rear connection box 002 is provided with a bellows, which facilitates pipeline connection and can also compensate for cold shrinkage.

[0046] Further, the low-temperature transmission pipeline heat leakage test system can test up to six channels of low-temperature pipelines and at least one channel of low-temperature pipelines.

[0047] Further, the low-temperature pipeline transmission heat leakage test system realizes helium recovery during the entire test process.

[0048] In a preferred embodiment of the utility model, the heater 006 can effectively adjust and control the inlet temperature, return temperature and exhaust temperature of the fluid.

[0049] In a preferred embodiment of the utility model, the low-temperature valve 005, the normal-temperature valve 013 and the flow controller 010 can effectively control and adjust the flow of the fluid.

[0050] In a preferred embodiment of the utility model, the enthalpy difference is obtained according to the pressure and temperature difference of the low-temperature fluid in the low-temperature transmission pipeline to be tested in the measurement test section 004, and then the heat leakage of the low-temperature transmission pipeline to be tested in the measurement test section is obtained by calculation combined with the mass flow of the low-temperature fluid.

[0051] In a preferred embodiment of the utility model, the pipeline interfaces of the main valve box 001 and the rear connection box 002 are all flange live interfaces sealed by indium wires, and can connect 1-6 channels of low-temperature test sections 004.

[0052] In a preferred embodiment of the utility model, the main valve box is provided with a mechanical safety valve 009, which can jump and quickly release pressure when the pressure in the pipeline is greater than 4.5bara, thereby ensuring the safety of the system.

[0053] In a preferred embodiment of the utility model, pressure transmitters 007 and temperature sensors 008 are arranged at key nodes of the entire pipeline system.

[0054] Compared with the prior art, the low-temperature transmission pipeline heat leakage test system has the following advantages:

[0055] First, the heater 006 can effectively adjust and control the inlet temperature, return temperature and exhaust temperature of the fluid; second, the low temperature valve 005, the normal temperature valve 013 and the flow controller 010 can effectively control and adjust the flow of the fluid;

[0056] Third, according to the pressure and temperature difference of the low temperature fluid in the low temperature transmission pipeline of the test sample section 004 to be tested for heat leakage, the enthalpy difference is obtained, and then combined with the flow of the low temperature fluid, the heat leakage of the low temperature transmission pipeline in the test sample section can be obtained by calculation, which is more accurate than the conventional static evaporation heat leakage measurement.

[0057] Fourth, the heater 006 is arranged on the exhaust measuring device, so that the low temperature fluid discharged from the main valve box 001 is heated to 0℃ or above, so as to prevent the pipeline from being frozen and frosted, and then affect the performance of the flow controller 010 and the normal temperature valve 013.

[0058] Fifth, the pipeline interfaces of the main valve box and the rear connecting box are all flange live interfaces sealed by indium wire, which can connect 1-6 channels of low temperature test sample sections.

[0059] Sixth, the main valve box is provided with a mechanical safety valve, which can jump and quickly release pressure when the pressure in the pipeline is greater than 4.5bara, so as to ensure the safety of the system.

[0060] Seventh, the test return gas is connected to the recovery airbag, which can be purified by the recovery purification system and recycled. BRIEF DESCRIPTION OF DRAWINGS

[0061] Figure 1 It is a schematic diagram of the low temperature transmission pipeline heat leakage test system.

[0062] Reference: 001-main valve box, 002-rear connecting box, 003-exhaust measuring device, 004-test sample section, 005-low temperature valve, 006-heater, 007-pressure transmitter, 008-temperature sensor, 009-safety valve, 010-flow controller, 011-back-up injection port, 012-injection port, 013-normal temperature valve, 014-recovery airbag. DETAILED DESCRIPTION

[0063] In order to more clearly illustrate the technical scheme of the present application, the embodiments of the present application will be further described below in combination with the drawings. Obviously, the embodiments in the following drawings are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to the drawings without creating any creative labor.

[0064] Reference Figure 1The utility model discloses a low temperature transmission pipeline heat leakage test system of first embodiment provides, including main valve box 001, its inside contains three cryogenic valves 005, for control pipeline fluid's flow and pressure.Three heaters 006, for control fluid's temperature.Three fluid passageway's pipe all set up pressure transmitter 007 and temperature sensor 008, to detect passageway fluid's pressure and temperature.Pipeline both ends have the passageway of valve and set up safety valve 009 in, prevent the dangerous of pressure rise to system under accidental condition.The rear -mounted connection box 002 contains heater 006, for control export fluid's temperature, has reached the purpose of testing low temperature transmission pipeline heat leakage under different temperature.Exhaust measuring device 003 contains heater 006, pressure transmitter 007, temperature sensor 008, normal temperature valve 013, flow controller 010, for detecting back gas's pressure and flow, and guarantee the low temperature fluid temperature of exhaust to recovery airbag 014 is higher than 0 DEG C.Test sample section 004 is equipped with the low temperature transmission pipeline sample section of measuring heat leakage, can contain 1-6 channels, and the import and export position of pipe in the sample section to be tested all set up temperature sensor 008, to measure fluid's temperature, and calculate low temperature transmission pipeline heat leakage in combination with fluid's pressure and mass flow.

[0065] In the embodiment, first install the test sample section of helium path that has installed temperature sensor, connect main valve box 001 and rear -mounted connection box 002, establish adiabatic vacuum and leak detection, ensure that there is no leakage and vacuum degree is less than 5x10 -3 After starting to cool down, the corresponding valve is opened, liquid nitrogen is filled through the liquid nitrogen filling inlet, the nitrogen path is cooled, after liquid nitrogen is sprayed out from the nitrogen outlet, it is considered that cooling is in place, the valve opening degree of the path can be controlled to ensure that the temperature of the path is maintained in the liquid nitrogen temperature zone.

[0066] In the embodiment, the heat leakage measurement of the helium path in the test sample section 004 is mainly carried out, after the liquid nitrogen path is cooled in place, the valve of the helium path is opened, liquid helium (LHe) is filled through the liquid helium filling inlet 012 to cool down, the cooling speed is controlled through the valve opening degree and the heater, after the temperature is reduced to the temperature zone to be measured, the valve and the flow controller 010 are adjusted to the required flow, whether the system is stable is judged through the pressure, temperature and flow curve.

[0067] In the embodiment, for the stable system, the pressure P, the temperature T and the flow value q are recorded, the enthalpy h out of the low temperature working medium at the outlet of the low temperature transmission pipeline, the enthalpy h in of the low temperature working medium at the inlet of the low temperature transmission pipeline are obtained through the property parameter library of helium, and then the heat leakage value Q is calculated through the following formula, and h is the enthalpy of the working medium corresponding to the pressure and the temperature.

[0068]

[0069] In the embodiment, a set of temperature zones and flow rate heat leakage measurement is completed, the valve opening and the flow rate controller 010 are adjusted to change the flow rate, the power of the heater 006 is adjusted to change the heat leakage test under different temperature zones, and a plurality of sets of data measurement results are compared to evaluate the heat leakage of the low-temperature transmission pipeline.

[0070] In the embodiment, a plurality of shapes of low-temperature transmission pipelines can be measured, including straight pipe sections and angled bend sections of different lengths.

[0071] In the embodiment, from the start of helium cooling, the heater 006 in the gas return measurement device 003 is turned on and the outlet temperature is automatically controlled to ensure that the outlet is above 0 DEG C to prevent icing and dewing of the normal-temperature pipeline.

[0072] In the embodiment, after the test is completed, the rewarming operation needs to be completed, the nitrogen path is warmed by normal-temperature nitrogen, and the helium path is warmed by normal-temperature helium, and during the whole process from the start of cooling to the end of rewarming, the helium in the helium path enters the recovery airbag 014 for recovery and purification.

[0073] The above is only used to illustrate the technical scheme of the utility model, and does not limit the utility model, although the above embodiment is described in detail, but the person skilled in the art can replace, modify and simply change it without departing from the range of the technical scheme, and these replacement, modification and simple change cannot make the essence of the corresponding technical scheme deviate from the range of the utility model embodiment.

Claims

1. A cryogenic transfer line heat leak test system, comprising: It comprises a data processing unit, a main valve box (001), a rear connection box (002), an exhaust measuring device (003), and a test sample section (004); the main valve box (001) is in airtight connection with the exhaust measuring device (003) through the test sample section (004); The main valve box (001) is provided with a low-temperature working medium input pipeline, a low-temperature working medium output pipeline, a cold screen medium input pipeline, and a cold screen medium output pipeline; the low-temperature working medium input pipeline is provided with a low-temperature valve (005) for controlling the flow rate q of the low-temperature working medium transmitted in the low-temperature transmission pipeline; the low-temperature working medium input pipeline is provided with a heater (006) for controlling the temperature of the low-temperature working medium transmitted in the low-temperature transmission pipeline; the low-temperature working medium input pipeline is provided with a pressure transmitter (007) for measuring the pressure P of the low-temperature working medium transmitted in the low-temperature transmission pipeline; The low-temperature working medium input pipeline is provided with a temperature sensor (008) for measuring the temperature T of the low-temperature working medium transmitted in the low-temperature transmission pipeline; The test sample section (004) is provided with two low-temperature transmission pipelines for testing heat leakage, and the rear connection box (002) is provided with a low-temperature working medium loop pipeline; one end of each of the two low-temperature transmission pipelines is connected with the low-temperature working medium input pipeline and the low-temperature working medium output pipeline respectively, and the other end of each of the two low-temperature transmission pipelines is connected with two ends of the low-temperature working medium loop pipeline respectively, forming a low-temperature working medium transmission channel; Each low-temperature transmission pipeline is provided with temperature sensors (008) at both ends for measuring the temperature difference of the low-temperature working medium in the low-temperature transmission pipeline; the rear connection box (002) is provided with a heater (006) for controlling the temperature of the low-temperature working medium transmitted in the low-temperature working medium loop pipeline; The test sample section (004) is provided with two cold screen medium transmission pipelines, and the rear connection box (002) is provided with a cold screen medium loop pipeline; one end of each of the two cold screen medium transmission pipelines is connected with the cold screen medium input pipeline and the cold screen medium output pipeline respectively, and the other end of each of the two cold screen medium transmission pipelines is connected with two ends of the cold screen medium loop pipeline respectively, forming a cold screen medium transmission channel to provide cold screen for the low-temperature working medium transmission channel; The low-temperature working medium output pipeline is connected with a recovery airbag 014 through the exhaust measuring device (003) to realize recovery of the low-temperature working medium; The data processing unit is configured to obtain the enthalpy h of the cryogen at the outlet of the cryogenic transmission pipeline according to the temperature T and the pressure P of the cryogen in the cryogenic transmission pipeline out , and the enthalpy h of the cryogen at the inlet of the cryogenic transmission pipeline in , and to obtain the heat leakage value Q of the cryogenic transmission pipeline by using the following formula .

2. The cryogenic transfer line heat leak test system of claim 1, wherein, The low-temperature working medium input pipeline is provided with a safety valve (009) for jumping when the pressure P reaches a take-off pressure threshold, thereby realizing safety protection for the heat leakage test of the low-temperature transmission pipeline.

3. The cryogenic transfer line heat leak test system of claim 1, wherein, The cold screen medium input pipeline is provided with a low-temperature valve (005), a heater (006), a pressure transmitter (007), and a temperature sensor (008).

4. The cryogenic transfer line leak heat test system of claim 1, wherein, The main valve box (001) is provided with a standby input pipeline, a standby output pipeline; the standby input pipeline is provided with a low temperature valve (005), a heater (006), a pressure transmitter (007), a temperature sensor (008) and a safety valve (009); the test sample section (004) is provided with two standby transmission pipelines, and the rear connection box (002) is provided with a standby loop pipeline; one end of the two standby transmission pipelines is connected with the standby input pipeline and the standby output pipeline through corrugated pipes respectively, and the other end of the two standby transmission pipelines is connected with two ends of the standby loop pipeline through corrugated pipes respectively, forming a standby transmission channel.

5. The cryogenic transfer line leak heat test system of claim 1, wherein, The exhaust measuring device (003) contains an exhaust pipeline, and the exhaust pipeline is provided with a heater (006), a pressure transmitter (007), a temperature sensor (008), a normal temperature valve (013) and a flow controller (010).

6. The cryogenic transfer line leak test system of any of claims 1-5, wherein, The cold screen medium input pipeline transmits two-phase flow or gaseous nitrogen working medium; the low temperature working medium is low temperature gaseous helium working medium.

7. The cryogenic transfer line leak test system of any of claims 1-5, wherein, The heater (006) in the rear connection box (002) is arranged on the low temperature working medium loop pipeline; the cold screen medium loop pipeline is provided with a heater (006) for controlling the temperature of the cold screen medium transmitted in the cold screen medium loop pipeline.

8. The cryogenic transfer line leak test system of any of claims 1-5, wherein, The main valve box (001) and the rear connection box (002) are vacuum containers.

9. The cryogenic transfer line leak test system of any of claims 1-5, wherein, One end of the two low temperature transmission pipelines is connected with the low temperature working medium input pipeline and the low temperature working medium output pipeline through corrugated pipes respectively, and the other end of the two low temperature transmission pipelines is connected with two ends of the low temperature working medium loop pipeline through corrugated pipes respectively, forming a low temperature working medium transmission channel; One end of the two cold screen medium transmission pipelines is connected with the cold screen medium input pipeline and the cold screen medium output pipeline through corrugated pipes respectively, and the other end of the two cold screen medium transmission pipelines is connected with two ends of the cold screen medium loop pipeline through corrugated pipes respectively, forming a cold screen medium transmission channel.

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