Thermal load testing device of multi-channel low-temperature transmission line

Abstract

The utility model relates to a thermal load testing device of a multi-channel low-temperature transmission line, which comprises a cold source and a flow measuring device, the multi-channel low-temperature transmission line comprises a container and a first pipeline, and the first pipeline is provided with a first port and a second port; the cold source is connected with the container through a first pipe and a second pipe, the first port is connected with the first pipe through a third pipe, and the second port is connected with the second pipe through a fourth pipe; a first valve is arranged on the first pipe, a second valve is arranged on the second pipe, a third valve is arranged on the third pipe, and a fourth valve is arranged on the fourth pipe; the flow measuring device is connected with the cold source, the second pipe and the fourth pipe and used for measuring thermal loads of the container and the first pipeline. The thermal load testing device of the multi-channel low-temperature transmission line can measure the thermal load of the multi-channel low-temperature transmission line before the multi-channel low-temperature transmission line is installed, so that whether the thermal load of the multi-channel low-temperature transmission line meets design requirements or not can be confirmed in time.

Description

Technical Field

[0001] This utility model relates to the field of cryogenic liquid transport technology, and more specifically to a thermal load testing device for a multi-channel cryogenic transport line. Background Technology

[0002] Liquid helium has important applications in aerospace, nuclear magnetic resonance, and superconducting accelerators. To minimize losses during transport, multi-channel cryogenic transport lines are often used, and thermal load is a key indicator for evaluating the transport efficiency of multi-channel cryogenic transport lines.

[0003] However, existing technology lacks a device for measuring the thermal load of multi-channel cryogenic transmission lines before installation. This makes it impossible to measure the thermal load of multi-channel cryogenic transmission lines before installation, resulting in many multi-channel cryogenic transmission lines experiencing thermal loads that are 1-2 orders of magnitude higher than the design value during actual use. Since they are already in use, the cost of retrofitting is extremely high, making upgrades impossible. Utility Model Content

[0004] The purpose of this invention is to provide a thermal load testing device for multi-channel cryogenic transmission lines, so as to measure the thermal load of the multi-channel cryogenic transmission lines before installation, thereby confirming in a timely manner whether the thermal load meets the design requirements.

[0005] To achieve the above objectives, this utility model provides a heat load testing device for a multi-channel cryogenic transmission line, comprising a cold source and a flow measurement device. The multi-channel cryogenic transmission line includes a container and a first pipeline. The first pipeline includes a first vertical section, a first horizontal section, a second vertical section, a second horizontal section, and a third vertical section connected in sequence. The end of the first vertical section away from the first horizontal section forms a first port, and the end of the third vertical section away from the second horizontal section forms a second port. The cold source is connected to the container through the first pipe and the second pipe. One end of the first pipe is connected to the first outlet of the cold source, and the other end of the first pipe is connected to the inlet of the container. One end of the second pipe is connected to the first inlet of the cold source, and the other end of the second pipe is connected to the outlet of the container. The first port is connected to the container through the third pipe. The first pipe is connected to the second pipe, and the connection point of the third pipe to the first pipe is located between the first outlet of the cold source and the inlet of the container; the second port is connected to the second pipe via a fourth pipe, and the connection point of the fourth pipe to the second pipe is located between the first inlet of the cold source and the outlet of the container; a first valve is provided on the first pipe, and the first valve is located between the inlet of the container and the connection point of the third pipe and the first pipe; a second valve is provided on the second pipe, and the second valve is located between the outlet of the container and the connection point of the second pipe and the fourth pipe; a third valve is provided on the third pipe, and a fourth valve is provided on the fourth pipe; the flow measurement device is connected to the third inlet of the cold source, the second pipe, and the fourth pipe respectively, and is used to measure the heat load of the container and the first pipe.

[0006] Optionally, the flow measurement device includes a fifth pipe, one end of which is connected to the third inlet of the cold source, the other end of which is connected to one end of a sixth pipe, and the other end of the sixth pipe is connected to the second pipe. The connection point between the sixth pipe and the second pipe is located between the second valve and the outlet of the container. The fifth pipe is provided with a heater, a first thermometer, a fifth valve, a flow meter, and a sixth valve arranged sequentially towards the third inlet of the cold source. The fifth pipe also has a first bypass pipe, one end of which is connected to the fifth pipe between the third inlet of the cold source and the sixth valve, and the other end of which is connected to the fifth pipe between the fifth valve and the first thermometer. The first bypass pipe has a seventh valve. The sixth pipe has an eighth valve and a second bypass pipe, one end of which is connected to the sixth pipe, with the connection point located between the eighth valve and the connection point of the sixth and fifth pipes. The other end of the second bypass pipe is connected to the fourth pipe, with the connection point located between the fourth valve and the second port. The second bypass pipe has a ninth valve.

[0007] Optionally, the first pipeline further includes a connecting pipe, one end of which is connected to the first vertical section, and the other end of which is connected to the third vertical section; the connecting pipe is located below the first port and the second port.

[0008] Optionally, the cross-section of the connecting pipe is at least one-third smaller than the smaller value of the cross-sections of the first vertical section and the third vertical section.

[0009] Optionally, the container includes a horizontal section and a vertical section. A second thermometer is provided on the vertical section of the container, and a third thermometer and a fourth thermometer are provided on the horizontal section of the container. The third thermometer is located at the top of the horizontal section of the container, and the fourth thermometer is located at the bottom of the horizontal section of the container.

[0010] A fifth thermometer is provided at the connection point between the first horizontal segment and the second vertical segment, a sixth thermometer is provided at the connection point between the second vertical segment and the second horizontal segment, and a seventh thermometer is provided on the third vertical segment;

[0011] The first tube is equipped with an eighth thermometer, which is located between the first valve and the inlet of the container; the third tube is equipped with a ninth thermometer, which is located between the third valve and the first port.

[0012] Optionally, the multi-channel further includes a second conduit, which includes a fourth vertical section, a fourth horizontal section, a fifth vertical section, a fifth horizontal section, and a sixth vertical section connected in sequence. The end of the fourth vertical section away from the fourth horizontal section forms a third port, and the end of the sixth vertical section away from the fifth horizontal section forms a fourth port. The third port is connected to the second outlet of the cold source through a seventh pipe, and the fourth port is connected to the second inlet of the cold source through an eighth pipe. A tenth valve is provided on the seventh pipe, and an eleventh valve is provided on the eighth pipe.

[0013] Optionally, a tenth thermometer is provided on the fifth vertical section, an eleventh thermometer is provided on the seventh tube, the eleventh thermometer is located between the tenth valve and the third port, and a twelfth thermometer is provided on the eighth tube, the twelfth thermometer is located between the eleventh valve and the fourth port.

[0014] Optionally, the multi-channel cryogenic transmission line further includes a cold shield, which forms a containment space. The container, the first pipeline, and the second pipeline are all located within the containment space, and at least a portion of the cold shield is fixed to the second pipeline.

[0015] Optionally, it also includes a valve box, wherein portions of the first pipe, the second pipe, the third pipe, the fourth pipe, the sixth pipe, the second bypass pipe, the seventh pipe, the eighth pipe, the first valve, the second valve, the third valve, the fourth valve, the eighth valve, the ninth valve, the tenth valve, the eleventh valve, the ninth thermometer, the eighth thermometer, the eleventh thermometer, and the twelfth thermometer are all located inside the valve box.

[0016] Optionally, the thermal load testing device has an initial state, a liquid accumulation state, and a test state, and can switch between the initial state, the liquid accumulation state, and the test state. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the thermal load testing device for a multi-channel low-temperature transmission line according to an embodiment of the present invention. Detailed Implementation

[0018] The preferred embodiments of this utility model are given below with reference to the accompanying drawings and described in detail. In the description, the structural positions of the various components, such as upper, lower, top, bottom, etc., are not absolute but relative. These directional descriptions are appropriate when the various components are arranged as shown in the figures, but they also change accordingly when the positions of the components in the figures change.

[0019] like Figure 1As shown, this utility model embodiment provides a heat load testing device for a multi-channel cryogenic transmission line, which includes a cold source 100 and a flow measurement device 300. The multi-channel cryogenic transmission line 400 includes a container 410 and a first pipeline 420. The first pipeline 420 includes a first vertical section 421, a first horizontal section 422, a second vertical section 423, a second horizontal section 424, and a third vertical section 425 connected in sequence. The end of the first vertical section 421 away from the first horizontal section 422 is formed as a first port 4211. The end of the third vertical section 425 away from the second horizontal section 424 is formed as a first port 4211. The first vertical section 421 is formed as a second port 4251; the cold source 100 forms a first circuit with the container 410 through the first pipe 210 and the second pipe 220. One end of the first pipe 210 is connected to the first outlet of the cold source 100, and the other end of the first pipe 210 is connected to the inlet of the container 410. One end of the second pipe 220 is connected to the first inlet of the cold source 100, and the other end of the second pipe 220 is connected to the outlet of the container 410; the first port 4211 of the first vertical section 421 is connected to the first pipe 210 through the third pipe 230, and the connection point between the third pipe 230 and the first pipe 210 is located at... Between the first outlet of the cold source 100 and the inlet of the container 410; the second port 4251 of the third vertical section 425 is connected to the second pipe 220 via the fourth pipe 240, and the connection point between the fourth pipe 240 and the second pipe 220 is located between the first inlet of the cold source 100 and the outlet of the container 410; the cold source 100, a portion of the first pipe 210, a portion of the second pipe 220, the third pipe 230, the fourth pipe 240, and the first pipe 420 form a second loop; a first valve 211 is provided on the first pipe 210, and the first valve 211 is located between the inlet of the container 410 and the third pipe Between the connection point of the first pipe 210 and the second pipe 220; the second pipe 220 is provided with a second valve 221, which is located between the outlet of the container 410 and the connection point of the second pipe 220 and the fourth pipe 240; the third pipe 230 is provided with a third valve 231, and the fourth pipe 240 is provided with a fourth valve 241; the flow measuring device 300 is connected to the third inlet of the cold source 100, the second pipe 220 and the fourth pipe 240 respectively, and is used to measure the amount of helium evaporation in the container 410 and the first pipe 420, thereby obtaining the heat load of the container 410 and the first pipe 420.

[0020] In some embodiments, the flow measurement device 300 includes a fifth pipe 310, one end of which is connected to the third inlet of the cold source 100, and the other end of which is connected to one end of a sixth pipe 250. The other end of the sixth pipe 250 is connected to a second pipe 220, and the connection point between the sixth pipe 250 and the second pipe 220 is located between the second valve 221 and the outlet of the container 410. The fifth pipe 310 is provided with a heater 311, a first thermometer 312, a fifth valve 313, a flow meter 314, and a sixth valve 315 arranged sequentially toward the third inlet of the cold source 100. The fifth pipe 310 is also provided with a first bypass pipe 320, one end of which is connected to the fifth pipe 310. The connection point is located between the third inlet of the cold source 100 and the sixth valve 315. The other end of the first bypass pipe 320 is connected to the fifth pipe 310 between the fifth valve 313 and the first thermometer 312. The first bypass pipe 320 is equipped with a seventh valve 321. The sixth pipe 250 is equipped with an eighth valve 251 and a second bypass pipe 260. One end of the second bypass pipe 260 is connected to the sixth pipe 250, and the connection point is located between the eighth valve 251 and the connection point of the sixth pipe 250 and the fifth pipe 310. The other end of the second bypass pipe 260 is connected to the fourth pipe 240, and the connection point is located between the fourth valve 241 and the second port 4251. The second bypass pipe 320 is equipped with a ninth valve 261.

[0021] In some embodiments, the first conduit 420 may further include a connecting pipe 426, the two ends of which are connected to the first vertical section 421 and the third vertical section 425 respectively, and the connecting pipe 426 is located below the first port 4211 and the second port 4251.

[0022] In some embodiments, the container 410 includes a horizontal section and a vertical section. A second thermometer 411 is provided on the vertical section, and a third thermometer 412 and a fourth thermometer 413 are provided on the horizontal section. The third thermometer 412 and the fourth thermometer 413 may be located at the top and bottom of the horizontal section, respectively.

[0023] A fifth thermometer 4231 is provided at the connection point between the first horizontal segment 422 and the second vertical segment 423, a sixth thermometer 4232 is provided at the connection point between the second vertical segment 423 and the second horizontal segment 424, and a seventh thermometer 4252 is provided on the third vertical segment 425.

[0024] The first tube 210 is equipped with an eighth thermometer 212, which is located between the first valve 211 and the inlet of the container 410; the third tube 230 is equipped with a ninth thermometer 232, which is located between the third valve 231 and the first port 4211.

[0025] In some embodiments, the multi-channel cryogenic transmission line 400 further includes a second conduit 430, which includes a fourth vertical section 431, a fourth horizontal section 432, a fifth vertical section 433, a fifth horizontal section 434, and a sixth vertical section 435 connected in sequence. The end of the fourth vertical section 431 away from the fourth horizontal section 432 is formed as a third port 4311, and the end of the sixth vertical section 435 away from the fifth horizontal section 434 is formed as a fourth port 4351. The third port 4311 is connected to the second outlet of the cold source 100 through a seventh pipe 270, and the fourth port 4351 is connected to the second inlet of the cold source 100 through an eighth pipe 280. A tenth valve 271 is provided on the seventh pipe 270, and an eleventh valve 281 is provided on the eighth pipe 280. The second conduit 430, the seventh pipe 270, the eighth pipe 280, and the cold source 100 form a third circuit. The fifth vertical section 433 is equipped with a tenth thermometer 4331, the seventh tube 270 is equipped with an eleventh thermometer 272, the eleventh thermometer 272 is located between the tenth valve 271 and the third port 4311, and the eighth tube 280 is equipped with a twelfth thermometer 282, the twelfth thermometer 282 is located between the eleventh valve 281 and the fourth port 4351. The multi-channel cryogenic transmission line 400 also includes a cold shield 440, which forms a containment space 441. The container 410, the first pipeline 420, and the second pipeline 430 are all located within the containment space 441. At least a portion of the cold shield 440 is fixed to the second pipeline 430, for example, it can be welded to the fifth horizontal section 434 of the second pipeline 430. The cold source 100 can provide cooling to the second pipeline 430, and the cooling is conducted to the cold shield 440. In this way, a lower temperature environment can be formed within the containment space 441, preventing the container 410, the first pipeline 420, and the second pipeline 430 from being affected by external heat radiation.

[0026] In some embodiments, the heat load testing apparatus may further include a valve housing 200, within which portions of the first tube 210, the second tube 220, the third tube 230, the fourth tube 240, the sixth tube 250, the second bypass tube 260, the seventh tube 270, the eighth tube 280, the first to fourth valves 211-241, the eighth valve 251, the ninth valve 261, the tenth valve 271, the eleventh valve 281, the ninth thermometer 232, the eighth thermometer 212, the eleventh thermometer 272, and the twelfth thermometer 282 are all located. The valve housing 200 is used to provide a vacuum environment to reduce the loss of cold air from the various tubes within it. Some of the tubes need to extend through the valve housing 200, and the connections between these tubes and the valve housing 200 are sealed.

[0027] The thermal load testing device for the multi-channel cryogenic transmission line of this utility model embodiment has an initial state, a liquid accumulation state, and a test state. By controlling the opening and closing of each valve, the thermal load testing device can be switched between the states.

[0028] In the initial state, all valves are closed, and flow meter 314 and heater 311 are closed.

[0029] The process of switching from the initial state to the liquid accumulation state is as follows: Open the tenth valve 271 and the eleventh valve 281. The cold energy (e.g., liquid helium) of the cold source 100 is transferred to the second pipeline 430 through the seventh pipe 270. The helium gas evaporated in the second pipeline 430 returns to the cold source 100 through the eighth pipe 280. The temperature of the third circuit 430 is detected by the twelfth thermometer 282, the eleventh thermometer 272 and the tenth thermometer 4331. When the temperature of each thermometer drops to its respective target value, the opening of the tenth valve 271 is adjusted to keep the temperature stable. Simultaneously, the first valve 211 and the second valve 221 can be opened, and the liquid helium supplied by the cold source 100 enters the container 410 through the first pipe 210, thereby accumulating liquid in the container 410. The helium gas evaporated in the container 410 returns to the cold source 100 through the second pipe 220. During the liquid accumulation process, the temperature of the container 410 is detected by the second thermometer 411, the third thermometer 412, and the fourth thermometer 413. When the temperature drops to the target value, the opening of the first valve 211 is adjusted to keep the temperature stable. In order to perform a heat load test on the container 410 in the future, the liquid helium in the container 410 needs to reach the target liquid level. Whether the liquid helium in the container 410 has reached the target liquid level can be determined by the second thermometer 411. Specifically, when the liquid helium comes into contact with the second thermometer 411, its temperature will drop rapidly. Therefore, when the temperature of the second thermometer 411 drops rapidly, it means that the liquid helium in the container 410 has reached the target liquid level. Simultaneously, the third valve 231 and the fourth valve 241 can be opened, allowing liquid helium supplied by the cold source 100 to enter the first pipe 420 through the first pipe 210 and the third pipe 230, thereby accumulating liquid in the first pipe 420. The evaporated helium gas returns to the cold source 100 through the fourth pipe 240 and the second pipe 220. The connecting pipe 426 is used to transfer the helium gas in the first vertical section 421 to the third vertical section 425, and then to the cold source 100 via the fourth pipe 240 and the second pipe 220. During the liquid accumulation process, the fifth thermometer 4231 and the sixth thermometer can be used to monitor the process. 4232. The seventh thermometer 4252 detects the temperature. When the temperature reaches the target value, the opening of the third valve 231 can be adjusted to keep the temperature stable. In order to perform a heat load test on the first pipeline 420 in the future, the liquid helium in the first pipeline 420 needs to reach the target level. Whether the liquid helium in the first pipeline 420 has reached the target level can be determined by the seventh thermometer 4252. Specifically, when the temperature of the seventh thermometer 4252 drops rapidly, it means that it has come into contact with the liquid helium, and it can be determined that the liquid helium in the first pipeline 420 has reached the target level.

[0030] The heat load testing device can perform heat load tests on container 410 and the first pipeline 420 respectively. Therefore, the test states include container test state and first pipeline test state. In the container test state, the heat load test is performed on container 410, and in the first pipeline test state, the heat load test is performed on the first pipeline 420. Before the test, container 410 and the first pipeline 420 need to reach the target liquid level. When testing container 410, the seventh valve 321 and heater 311 can be opened first, then the first valve 211 and the second valve 221 can be closed, and then the eighth valve 251 can be slowly opened until it is fully open. According to the reading of the first thermometer 312, when its temperature is higher than 260K, the flow meter 314 can be opened first, then the fifth valve 313 and the sixth valve 315 can be opened, and finally the seventh valve 321 can be closed. At this time, the amount of helium gas evaporated from container 410 can be measured by the flow meter 311, and then the heat load of container 410 can be calculated.

[0031] When testing the first pipeline 420, the seventh valve 321 and heater 311 can be opened first, then the third valve 231 and fourth valve 241 can be closed, and then the ninth valve 261 can be slowly opened until it is fully open. According to the reading of the first thermometer 312, when its temperature is higher than 260K, the flow meter 314 can be opened first, then the fifth valve 313 and sixth valve 315 can be opened, and finally the seventh valve 321 can be closed; at this time, the amount of helium gas evaporated from the first pipeline 420 can be measured by the flow meter 311, and then the heat load of the first pipeline 420 can be calculated.

[0032] In some embodiments, container 410 may be formed of a tube with a larger diameter. A first tube 210 may be inserted into container 410 and is limited to not contacting the highest liquid helium level inside container 410; a second tube 220 is not inserted into container 410 and is only connected to its outlet end.

[0033] In some embodiments, the cross-section of the connecting pipe 426 is at least one-third smaller than the smaller value of the cross-sections of the first vertical section 421 and the third vertical section 425.

[0034] The thermal load testing device for multi-channel low-temperature transmission lines according to this utility model can measure the thermal load of multi-channel low-temperature transmission lines before installation, thereby confirming in a timely manner whether the thermal load meets the design requirements.

[0035] In this document, terms such as “first” and “second” are not used to specify the order of events or the number of components, unless otherwise stated.

[0036] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various variations can be made to the above embodiments of this utility model. That is, all simple and equivalent changes and modifications made based on the claims and description of this utility model application fall within the protection scope of the claims of this utility model patent. Any aspects of this utility model not described in detail are conventional technical content.

Claims

1. A thermal load testing apparatus for a multi-channel cryogenic transfer line, the apparatus comprising: The multi-channel low-temperature transfer line comprises a container and a first pipeline, the first pipeline comprises a first vertical section, a first horizontal section, a second vertical section, a second horizontal section and a third vertical section connected in sequence, one end of the first vertical section is formed into a first port away from the first horizontal section, one end of the third vertical section is formed into a second port away from the second horizontal section; The cold source is connected with the container through a first pipe and a second pipe, one end of the first pipe is connected with a first outlet of the cold source, the other end of the first pipe is connected with an inlet of the container, one end of the second pipe is connected with a first inlet of the cold source, the other end of the second pipe is connected with an outlet of the container; The first port is connected with the first pipe through a third pipe, the connection point of the third pipe with the first pipe is located between the first outlet of the cold source and the inlet of the container; the second port is connected with the second pipe through a fourth pipe, the connection point of the fourth pipe with the second pipe is located between the first inlet of the cold source and the outlet of the container; a first valve is arranged on the first pipe, the first valve is located between the inlet of the container and the connection point of the third pipe with the first pipe; a second valve is arranged on the second pipe, the second valve is located between the outlet of the container and the connection point of the second pipe with the fourth pipe; a third valve is arranged on the third pipe, a fourth valve is arranged on the fourth pipe; the flow measuring device is connected with a third inlet of the cold source, the second pipe and the fourth pipe respectively, and is used for measuring the heat load of the container and the first pipeline.

2. The thermal load testing apparatus for a multi-channel cryogenic transfer line of claim 1, wherein, The flow measuring device comprises a fifth pipe, one end of the fifth pipe is connected with the third inlet of the cold source, the other end of the fifth pipe is connected with one end of a sixth pipe, the other end of the sixth pipe is connected with the second pipe, the connection point of the sixth pipe with the second pipe is located between the second valve and the outlet of the container; a heater, a first thermometer, a fifth valve, a flow meter and a sixth valve are arranged on the fifth pipe in sequence towards the third inlet of the cold source; a first bypass pipe is further arranged on the fifth pipe, one end of the first bypass pipe is connected with the fifth pipe at a connection point located between the third inlet of the cold source and the sixth valve, the other end of the first bypass pipe is connected with the fifth pipe at a connection point located between the fifth valve and the first thermometer; a seventh valve is arranged on the first bypass pipe; an eighth valve and a second bypass pipe are arranged on the sixth pipe, one end of the second bypass pipe is connected with the sixth pipe at a connection point located between the eighth valve and the connection point of the sixth pipe with the fifth pipe, the other end of the second bypass pipe is connected with the fourth pipe at a connection point located between the fourth valve and the second port; a ninth valve is arranged on the second bypass pipe.

3. The thermal load testing apparatus for a multi-pass cryogenic transfer line of claim 1, wherein, The first pipeline further comprises a connecting pipe, one end of the connecting pipe is connected with the first vertical section, the other end of the connecting pipe is connected with the third vertical section; the connecting pipe is located below the first port and the second port.

4. The thermal load testing apparatus for a multi-pass cryogenic transfer line of claim 3, wherein, The cross section of the connecting pipe is at least one third of the smaller of the cross sections of the first vertical section and the third vertical section.

5. The thermal load testing apparatus for a multi-pass cryogenic transfer line of claim 2, wherein, The container comprises a horizontal section and a vertical section, a second thermometer is arranged on the vertical section of the container, a third thermometer and a fourth thermometer are arranged on the horizontal section of the container, the third thermometer is located at the top of the horizontal section of the container, and the fourth thermometer is located at the bottom of the horizontal section of the container. A fifth thermometer is arranged at the connecting point of the first horizontal section and the second vertical section, a sixth thermometer is arranged at the connecting point of the second vertical section and the second horizontal section, and a seventh thermometer is arranged on the third vertical section. An eighth thermometer is arranged on the first pipe, and the eighth thermometer is located between the first valve and the inlet of the container; a ninth thermometer is arranged on the third pipe, and the ninth thermometer is located between the third valve and the first port.

6. The thermal load testing apparatus for a multi-pass cryogenic transfer line of claim 5, wherein, The multi-channel further comprises a second pipe line, the second pipe line comprises a fourth vertical section, a fourth horizontal section, a fifth vertical section, a fifth horizontal section and a sixth vertical section connected in sequence, one end of the fourth vertical section away from the fourth horizontal section is formed into a third port, one end of the sixth vertical section away from the fifth horizontal section is formed into a fourth port, the third port is connected with the second outlet of the cold source through a seventh pipe, and the fourth port is connected with the second inlet of the cold source through an eighth pipe; a tenth valve is arranged on the seventh pipe, and an eleventh valve is arranged on the eighth pipe.

7. The thermal load testing apparatus for a multi-channel cryogenic transfer line of claim 6, wherein, A tenth thermometer is arranged on the fifth vertical section, an eleventh thermometer is arranged on the seventh pipe, the eleventh thermometer is located between the tenth valve and the third port, a twelfth thermometer is arranged on the eighth pipe, and the twelfth thermometer is located between the eleventh valve and the fourth port.

8. The thermal load testing apparatus for a multi-pass cryogenic transfer line of claim 6, wherein, The multi-channel low-temperature transmission line further comprises a cold screen, the cold screen surrounds a containing space, the container, the first pipe line and the second pipe line are located in the containing space, and at least part of the cold screen is fixed on the second pipe line.

9. The thermal load testing apparatus for a multi-pass cryogenic transfer line of claim 7, wherein, A valve box is further included, parts of the first pipe, the second pipe, the third pipe, the fourth pipe, the sixth pipe, the second bypass pipe, parts of the seventh pipe and the eighth pipe, the first valve, the second valve, the third valve, the fourth valve, the eighth valve, the ninth valve, the tenth valve, the eleventh valve, the ninth thermometer, the eighth thermometer, the eleventh thermometer and the twelfth thermometer are located in the valve box.

10. The thermal load testing apparatus for a multi-pass cryogenic transfer line of claim 1, wherein, The heat load test device has an initial state, a liquid accumulation state and a test state, and can be switched between the initial state, the liquid accumulation state and the test state.

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