Static heat leakage testing device for liquid helium tank
By designing a static heat leakage test device and using cold source, heater and valve control, the gap in the static heat leakage test technology of the liquid helium tank box is solved, and accurate testing of the liquid helium tank box is achieved to ensure that it meets the use The requirements have promoted the research and development of liquid helium tank boxes.
Patent Information
- Application Number
- CN202421145523.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-05-23
AI Technical Summary
The prior art lacks a device for static heat leakage testing of liquid helium tanks, which makes it impossible to determine whether it can meet the usage requirements, affecting the loss management during liquid helium storage and transportation.
A static heat leakage test device including a cold source, a liquid helium tank box to be tested, a heater, purification and recycling equipment and a helium storage tank was designed, and the initial, liquid accumulation, test and re-temperature states were controlled by valves and pipelines. Switch between to realize static heat leakage test of liquid helium tank box.
The device can accurately measure the static heat leakage of liquid helium tank boxes, fill the gap in the existing technology, and enable designers to conduct effective testing during the development process, ensure that the liquid helium tank box meets the usage requirements, and promote the liquid helium tank box R&D progress.
Smart Images
Figure CN222232044U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of cryogenic liquid storage, and more specifically to a static heat leakage testing device for a liquid helium tank box. Background Art
[0002] With the development of science and technology and economy, the demand for helium resources in industrial production and scientific research continues to increase. Helium plays an extremely important role in rocket launches, nuclear magnetic resonance, superconducting magnet cooling, airships, optical fiber and semiconductor manufacturing, leak detection production and other fields.
[0003] In order to save transportation costs, helium is usually transported in the form of high-pressure helium and liquid helium. Liquid helium tanks are the main equipment for storing and transporting liquid helium. In order to enable it to store liquid helium for a long time and minimize the loss of liquid helium during storage and transportation, it is necessary to test the static heat leakage of liquid helium tanks during the development process so that it can meet the use requirements.
[0004] However, the prior art lacks a device for testing the static heat leakage of the liquid helium tank, which results in an inability to test the static heat leakage during the development process and an inability to determine whether it can meet the use requirements. Utility Model Content
[0005] The utility model aims to provide a static heat leakage test device for a liquid helium tank box, so as to perform a static heat leakage test on a liquid helium tank box to be tested during the development process, so as to make it meet the use requirements.
[0006] Based on the above purpose, the utility model provides a static heat leakage test device for a liquid helium tank box, comprising a cold source, a liquid helium tank box to be tested, a heater, a purification and recovery device and a helium storage tank, wherein the cold source is connected to the liquid helium tank box to be tested through a first pipeline, and a first valve and a second valve are respectively arranged on the first pipeline, the first valve is close to the cold source, and the second valve is close to the liquid helium tank box to be tested; a second pipeline and a third pipeline are sequentially connected between the liquid helium tank box to be tested and the heater, and a third valve is arranged on the second pipeline; the heater is connected to the purification and recovery device through a fourth pipeline, and a fourth valve is arranged on the fourth pipeline, The fourth pipeline is connected in parallel with a fifth pipeline, both ends of the fifth pipeline are connected to the fourth pipeline, the fourth valve is located between the two ends of the fifth pipeline, and the fifth pipeline is sequentially provided with a fifth valve, a flow meter and a sixth valve; the purification recovery equipment is connected to the helium storage tank through the sixth pipeline, the helium storage tank is connected to the cold source through the seventh pipeline, and the seventh pipeline is provided with a seventh valve; the liquid helium tank box to be tested is connected to the seventh pipeline through the eighth pipeline, and the connection point between the eighth pipeline and the seventh pipeline is located between the helium storage tank and the seventh valve; the eighth pipeline is provided with an eighth valve.
[0007] Furthermore, the device has an initial state, a fluid accumulation state, a test state and a rewarming state, and can switch among the initial state, the fluid accumulation state, the test state and the rewarming state.
[0008] Further, when in the initial state, the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the eighth valve, the flow meter and the heater are all in a closed state.
[0009] Further, when in the liquid accumulation state, the first valve, the second valve, the third valve, the fourth valve and the seventh valve are in an open state, the remaining valves are in a closed state, the flow meter is in a closed state, and the heater is in an open state.
[0010] Further, when in the test state, the first valve, the third valve, the fifth valve, the sixth valve and the seventh valve are in an open state, the remaining valves are in a closed state, and the flow meter and the heater are in an open state.
[0011] Further, when in the rewarming state, the second valve, the third valve, the fourth valve, the seventh valve and the eighth valve are in an open state, the remaining valves are in a closed state, the flow meter is in a closed state, and the heater is in an open state.
[0012] Furthermore, it also includes a liquid helium storage tank, which is connected to the first pipeline through a ninth pipeline, the connection point between the ninth pipeline and the first pipeline is located between the second valve and the liquid helium tank to be tested, and the ninth pipeline is provided with a ninth valve; the liquid helium storage tank is connected to the first pipeline through a tenth pipeline, the connection point between the tenth pipeline and the first pipeline is located between the first valve and the second valve, and the tenth pipeline is provided with a tenth valve;
[0013] When in the liquid accumulation state, the third valve, the fourth valve, the seventh valve and the ninth valve are in the open state, the remaining valves are in the closed state, the flow meter is in the closed state, and the heater is in the open state.
[0014] Furthermore, the liquid helium storage tank is connected to the third pipeline via a thirteenth pipeline, and a fourteenth valve is provided on the thirteenth pipeline.
[0015] Furthermore, it also includes an eleventh pipeline and a twelfth pipeline, one end of the eleventh pipeline is connected to the third pipeline, the other end of the eleventh pipeline is connected to one end of the heat exchanger in the cold source, the other end of the heat exchanger is connected to one end of the twelfth pipeline, the other end of the twelfth pipeline is connected to the third pipeline, the third pipeline is provided with an eleventh valve and a first thermometer, the eleventh valve is located between the connection point of the eleventh pipeline and the third pipeline and the connection point of the twelfth pipeline and the third pipeline, the first thermometer is located between the connection point of the eleventh pipeline and the third pipeline and the connection point of the second pipeline and the third pipeline, the eleventh pipeline is provided with a twelfth valve, and the twelfth pipeline is provided with a thirteenth valve.
[0016] Furthermore, a second thermometer is provided on the fourth pipeline, and the second thermometer is located between the heater and a connection point between the fifth pipeline and the fourth pipeline close to the heater.
[0017] The static heat leakage test device for the liquid helium tank container of the utility model embodiment can accurately measure the static heat leakage of the liquid helium tank container to be tested, fill the gap in the static heat leakage test technology and standards of the liquid helium tank container, and enable designers to perform static heat leakage tests on the liquid helium tank container to be tested during the development process to make it meet the use requirements, thereby promoting the research and development progress of the liquid helium tank container. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 The figure is a schematic structural diagram of a static heat leakage testing device for a liquid helium tank according to an embodiment of the utility model. DETAILED DESCRIPTION
[0019] The preferred embodiments of the present utility model are given below in conjunction with the accompanying drawings and described in detail.
[0020] like Figure 1As shown, the embodiment of the utility model provides a static heat leakage test device for a liquid helium tank box, comprising a cold source 100, a liquid helium tank box to be tested 200, a heater 300, a purification recovery device 400 and a helium storage tank 500, the cold source 100 is connected to the liquid helium tank box to be tested 200 through a first pipeline 110, the first pipeline 110 is respectively provided with a first valve 111 and a second valve 112, the first valve 111 is close to the cold source 100, and the second valve 112 is close to the liquid helium tank box to be tested 200, the liquid helium tank box to be tested 200 is connected to the heater 300 through a second pipeline 210 and a third pipeline 310, wherein one end of the second pipeline 210 is connected to the liquid helium tank box to be tested 200, the other end of the second pipeline 210 is connected to one end of the third pipeline 310, and the other end of the third pipeline 310 is connected to the heater 300; the second pipeline 210 is provided with a third valve 211, and the heater 300 is connected to the third pipeline 310 through the third pipeline 310. The fourth pipeline 320 is connected to the purification and recovery equipment 400, a fourth valve 321 is provided on the fourth pipeline 320, a fifth pipeline 330 is connected in parallel to the fourth pipeline 320, both ends of the fifth pipeline 330 are connected to the fourth pipeline 320, the fourth valve 321 is located between the two ends of the fifth pipeline 330, the fifth valve 331, a flow meter 332 and a sixth valve 333 are sequentially provided on the fifth pipeline 330, the purification and recovery equipment 400 is connected to the helium storage tank 500 through the sixth pipeline 410, the helium storage tank 500 is connected to the cold source 100 through the seventh pipeline 510, the seventh pipeline 510 is provided with a seventh valve 511, the liquid helium tank box 200 to be tested is connected to the seventh pipeline 510 through the eighth pipeline 220, and the connection point between the eighth pipeline 220 and the seventh pipeline 510 is located between the helium storage tank 500 and the seventh valve 511, and the eighth pipeline 220 is provided with an eighth valve 221.
[0021] The static heat leakage test device has an initial state, a liquid accumulation state, a test state and a rewarming state. By opening and closing each valve, the static heat leakage test device can be switched among the initial state, the liquid accumulation state, the test state and the rewarming state.
[0022] When the static heat leakage test device is in the initial state, all valves are in the closed state, and the heater 300 is in the closed state.
[0023] When the static heat leakage test device is in the liquid accumulation state, the first valve 111, the second valve 112, the third valve 211, the fourth valve 321 and the seventh valve 511 are in the open state, the other valves are in the closed state, the flow meter 332 is in the closed state, and the heater 300 is in the open state. At this time, the liquid helium in the cold source 100 can flow into the liquid helium tank box 200 to be tested through the first pipeline 110, and the flow rate of the liquid helium can be adjusted by the second valve 112. Since the liquid helium tank box 200 to be tested is at room temperature in the initial state, when the liquid helium is passed into the liquid helium tank box 200, the liquid helium will first pre-cool the liquid helium tank box 200, and part of the liquid helium will be heated to become helium. The helium will pass from the second pipeline 210 to the third pipeline 310, and then pass from the third pipeline 310 to the heater 300, and the heater 300 will heat the helium to make it become room temperature helium. The heated helium The helium enters the purification and recovery equipment 400 through the fourth pipeline 320, and the purification and recovery equipment 400 purifies and recovers the heated helium. The purified and recovered helium enters the helium storage tank 500 through the sixth pipeline 410, and then the helium enters the cold source 100 through the seventh pipeline 510, and the cold source 100 cools the helium to turn it into liquid helium, thereby realizing the recycling of helium; when the liquid level in the liquid helium tank box 200 to be tested reaches 95%, the liquid accumulation is completed, and the static heat leakage test device can be switched from the liquid accumulation state to the test state, and the static heat leakage test is performed in the test state.
[0024] When the static heat leakage test device is in the test state, the first valve 111, the third valve 211, the fifth valve 331, the sixth valve 333 and the seventh valve 511 are in the open state, the other valves are in the closed state, the flow meter 332 is in the open state, and the heater 300 is in the open state. At this time, the static heat leakage test of the liquid helium tank 200 to be tested can be carried out. Specifically, the helium gas after the liquid helium in the liquid helium tank 200 to be tested evaporates enters the heater 300 through the second pipeline 210 and the third pipeline 310, and the heater 300 heats the helium gas to a preset temperature (for example, 280-300K). The heated helium gas enters the flow meter 332, and the helium gas flow rate is measured by the flow meter 332. Then, the static heat leakage of the liquid helium tank 200 is obtained according to the measured helium gas flow rate. Specifically, the flow data measured by the flow meter 332 can be time-integrated and then divided by the total time to obtain an average flow rate, and then the average flow rate is multiplied by the latent heat of liquid helium to obtain the static heat leakage of the liquid helium tank 200 to be tested. After the test is completed, the static heat leakage test device can be switched from the test state to the rewarming state.
[0025] When the static thermal leakage test device is in the rewarming state, the second valve 112, the third valve 211, the fourth valve 321 and the seventh valve 511 are in the open state, the other valves are in the closed state, the flow meter 332 is in the closed state, and the heater 300 is in the open state. At this time, the internal heater of the liquid helium tank box 200 to be tested can be turned on to heat the liquid helium, so that the liquid helium evaporates into helium gas, and the evaporated helium gas passes through the heater 300 and the purification recovery device 400 in sequence and enters the helium storage tank 500 for storage; when the liquid level of the liquid helium tank box 200 to be tested is zero, the eighth valve 221 can be opened to allow the helium in the helium storage tank 500 to pass into the liquid helium tank box 200 to be tested, so that the inside of the liquid helium tank box 200 to be tested quickly returns to normal temperature; then all valves and the heater 300 can be closed to switch the static thermal leakage test device from the rewarming state to the initial state.
[0026] In some embodiments, the static heat leakage test device may further include a liquid helium storage tank 600, which is connected to the first pipeline 110 through a ninth pipeline 610, the connection point between the ninth pipeline 610 and the first pipeline 110 is located between the second valve 112 and the liquid helium tank 200 to be tested, and a ninth valve 611 is provided on the ninth pipeline 610; the liquid helium storage tank 600 is connected to the first pipeline 110 through a tenth pipeline 620, the connection point between the tenth pipeline 620 and the first pipeline 110 is located between the first valve 111 and the second valve 112, and a tenth valve 621 is provided on the tenth pipeline 620.
[0027] The liquid helium storage tank 600 is used to store liquid helium. For example, the first valve 111 and the tenth valve 621 can be opened to allow the liquid helium in the cold source 100 to flow into the liquid helium storage tank 600 through the first pipeline 110 and the tenth pipeline 620 for storage.
[0028] In some embodiments, the third valve 211, the fourth valve 321, the seventh valve 511 and the ninth valve 611 can also be opened, the other valves can be closed, the flow meter 332 can be closed, and the heater 300 can be opened, so that the static heat leakage test device is in a liquid accumulation state. At this time, the liquid helium in the liquid helium storage tank 600 can be passed into the liquid helium tank box 200 to be tested to complete the liquid accumulation.
[0029] In some embodiments, the static heat leakage testing device may further include an eleventh pipeline 710 and a twelfth pipeline 720, one end of the eleventh pipeline 710 is connected to the third pipeline 310, the other end of the eleventh pipeline 710 is connected to one end of the heat exchanger 120 in the cold source 100, the other end of the heat exchanger 120 is connected to one end of the twelfth pipeline 720, the other end of the twelfth pipeline 720 is connected to the third pipeline 310, the third pipeline 310 is provided with an eleventh valve 311 and a first thermometer 312, the eleventh valve 311 is located between the connection point between the eleventh pipeline 710 and the third pipeline 310 and the connection point between the twelfth pipeline 720 and the third pipeline 310, the first thermometer 312 is located between the connection point between the eleventh pipeline 710 and the third pipeline 310 and the connection point between the second pipeline 210 and the third pipeline 310, the eleventh pipeline 710 is provided with a twelfth valve 711, and the twelfth pipeline 720 is provided with a thirteenth valve 721. The eleventh pipeline 710 and the twelfth pipeline 720 are used to recover cold energy from helium in the liquid accumulation state and the rewarming state.
[0030] For example, in the liquid accumulation state and the rewarming state, the temperature of the helium here can be measured by the first thermometer 312. When the temperature is less than 120K, the twelfth valve 711 and the thirteenth valve 721 can be opened, and the eleventh valve 311 can be closed, so that the helium transmitted from the second pipeline 210 enters the heat exchanger 120 along the eleventh pipeline 710 to exchange heat with the high-temperature helium in the cold source 100. The helium after heat exchange returns to the third pipeline 310 along the twelfth pipeline 720, and then enters the heater 300, thereby realizing the cold recovery of the helium. When the temperature of the first thermometer 312 is greater than 120K, the twelfth valve 711 and the thirteenth valve 721 can be closed, and the eleventh valve 311 can be opened, so that the helium directly enters the heater 300.
[0031] In some embodiments, a second thermometer 322 may be provided on the fourth pipeline 320. The second thermometer 322 is located between the heater 300 and the connection point between the fifth pipeline 330 and the fourth pipeline 320 close to the heater 300. The second thermometer 322 is used to measure the temperature of the helium in the fourth pipeline 320. In the measuring state, the temperature measured by the second thermometer 322 is observed every preset time (for example, 5 minutes). If it reaches the preset temperature (for example, 280-300K), the count of the counter is increased by 1. If the preset temperature is not reached, the count of the counter is reset to zero. When the count of the counter reaches a preset number (for example, 10), the fifth valve 331 and the sixth valve 333 can be opened, and then the fourth valve 321 can be closed to allow the helium to flow through the fifth pipeline 330, and then the flowmeter 332 is opened to collect flow data.
[0032] In some embodiments, the liquid helium storage tank 600 can be connected to the third pipeline 310 through a thirteenth pipeline 630, and a fourteenth valve 631 is provided on the thirteenth pipeline 630. The connection point between the thirteenth pipeline 630 and the third pipeline 310 is located between the fourteenth valve 631 and the first thermometer 312. The thirteenth pipeline 630 is used to transport the helium generated during the injection process of the cold source 100 into the liquid helium storage tank 600 to the third pipeline 310 to achieve helium recovery. When injecting liquid helium, the fourteenth valve 631 is in an open state, and after the injection is completed, the fourteenth valve 631 is in a closed state.
[0033] In some embodiments, each valve 111, 112, 211, 311, 321, 611, 621, 631, 711, 721 may be a low-temperature valve, and the remaining valves 221, 511, 331, 333 may be normal temperature valves.
[0034] The method for using the static heat leakage test device of the liquid helium tank box of the utility model embodiment comprises the following steps:
[0035] S10: When the static heat leakage test device of the liquid helium tank is in the initial state, the heater 300, the first valve 111, the second valve 112, the third valve 211, the fourth valve 321 and the seventh valve 511 are opened, or the heater 300, the third valve 211, the fourth valve 321, the seventh valve 511 and the ninth valve 611 are opened, so that the static heat leakage test device is switched from the initial state to the liquid accumulation state, so that the cold source 100 or the liquid helium storage tank 600 passes liquid helium into the liquid helium tank 200 to be tested, so as to perform liquid accumulation;
[0036] S20: When the liquid level in the liquid helium tank 200 to be tested reaches the first liquid level (e.g., 95%), it can be considered that the liquid accumulation is completed, and then the second valve 112 can be closed (when the liquid helium is provided by the cold source 100) or the ninth valve 611 can be closed (when the liquid helium is provided by the liquid helium storage tank 600); then, at a preset time interval (e.g., 5 minutes), it is determined whether the temperature of the second thermometer 322 reaches the preset temperature (e.g., 280-330K). If so, the counter count is increased by 1, and if not, the counter count is reset to zero; when the counter count reaches a preset number (e.g., 10), first The fifth valve 331 and the sixth valve 333 are opened, and then the fourth valve 321 is closed, and then the flow meter 332 is opened to collect flow data, and the static heat leakage test device is switched from the liquid accumulation state to the test state, and then the test state is maintained until the liquid level of the liquid helium tank 200 to be tested is lower than the second liquid level (for example, 80%); then the time average flow rate is obtained by performing time integration according to the flow data of the flow meter 332 during this period of time and then dividing it by the total time, and then the time average flow rate is obtained, and then the time average flow rate is multiplied by the latent heat of the liquid helium to obtain the static heat leakage of the liquid helium tank 200 to be tested;
[0037] S30: When the liquid level of the liquid helium tank 200 to be tested is lower than the second liquid level, the fourth valve 321 may be opened first, and then the fifth valve 331 and the sixth valve 333 may be closed, and finally the flow meter 332 may be closed; then the internal heater of the liquid helium tank 200 to be tested may be opened to heat the liquid helium therein to evaporate the liquid helium into helium gas; when the liquid level of the liquid helium tank 200 to be tested is 0, the internal heater may be closed, and then the eighth valve 221 may be opened to allow the helium in the helium storage tank 500 to flow into the liquid helium tank 200 to be tested to accelerate its rewarming;
[0038] S40: When the temperature inside the liquid helium tank 200 to be tested reaches room temperature, all valves and the heater 300 are closed to return the static heat leakage test device to an initial state.
[0039] In steps S10 and S30, it can be determined at regular intervals (e.g., 10 minutes) whether the temperature of the first thermometer 312 is less than a preset temperature (e.g., 120K). If so, the twelfth valve 711 and the thirteenth valve 721 are opened first, and then the eleventh valve 311 is closed to achieve cold air recovery.
[0040] During the test phase in step S20 , the twelfth valve 711 and the thirteenth valve 721 need to be kept closed, and the eleventh valve 311 needs to be opened.
[0041] The static heat leakage test device for the liquid helium tank container of the embodiment of the utility model can accurately measure the static heat leakage of the liquid helium tank container 200 to be tested, fill the gap in the static heat leakage test technology and standards of the liquid helium tank container, and enable designers to perform static heat leakage tests on the liquid helium tank container 200 to be tested during the development process to make it meet the use requirements, thereby promoting the research and development progress of the liquid helium tank container.
[0042] The above is only a preferred embodiment of the utility model, and is not intended to limit the scope of the utility model. The above embodiments of the utility model can also be modified in various ways. That is, all simple, equivalent changes and modifications made according to the claims and the contents of the specification of the utility model application fall within the scope of protection of the claims of the utility model patent. The conventional technical contents are not described in detail in the utility model.
Claims
1. A static heat leakage test device for a liquid helium tank, characterized in that: The invention comprises a cold source, a liquid helium tank to be tested, a heater, a purification and recovery device and a helium storage tank, wherein the cold source is connected to the liquid helium tank to be tested through a first pipeline, a first valve and a second valve are respectively arranged on the first pipeline, the first valve is close to the cold source, and the second valve is close to the liquid helium tank to be tested; a second pipeline and a third pipeline are connected in sequence between the liquid helium tank to be tested and the heater, and a third valve is arranged on the second pipeline; the heater is connected to the purification and recovery device through a fourth pipeline, a fourth valve is arranged on the fourth pipeline, and a fifth pipeline is connected in parallel to the fourth pipeline, Both ends of the fifth pipeline are connected to the fourth pipeline, the fourth valve is located between the two ends of the fifth pipeline, and the fifth pipeline is provided with a fifth valve, a flow meter and a sixth valve in sequence; the purification recovery equipment is connected to the helium storage tank through the sixth pipeline, the helium storage tank is connected to the cold source through the seventh pipeline, and the seventh pipeline is provided with a seventh valve; the liquid helium tank box to be tested is connected to the seventh pipeline through the eighth pipeline, and the connection point between the eighth pipeline and the seventh pipeline is located between the helium storage tank and the seventh valve; the eighth pipeline is provided with an eighth valve.
2. The static heat leakage test device for liquid helium tank according to claim 1, characterized in that: The device has an initial state, a fluid accumulation state, a test state and a rewarming state, and can be switched among the initial state, the fluid accumulation state, the test state and the rewarming state.
3. The static heat leakage test device for liquid helium tank according to claim 2, characterized in that: When in the initial state, the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the eighth valve, the flow meter and the heater are all in a closed state.
4. The static heat leakage test device for liquid helium tank according to claim 2, characterized in that: When in the liquid accumulation state, the first valve, the second valve, the third valve, the fourth valve and the seventh valve are in the open state, the remaining valves are in the closed state, the flow meter is in the closed state, and the heater is in the open state.
5. The static heat leakage test device for liquid helium tank according to claim 2, characterized in that: When in the test state, the first valve, the third valve, the fifth valve, the sixth valve and the seventh valve are in an open state, the remaining valves are in a closed state, and the flow meter and the heater are in an open state.
6. The static heat leakage test device for liquid helium tank according to claim 2, characterized in that: When in the rewarming state, the second valve, the third valve, the fourth valve, the seventh valve and the eighth valve are in the open state, the remaining valves are in the closed state, the flow meter is in the closed state, and the heater is in the open state.
7. The static heat leakage test device for liquid helium tank according to claim 2, characterized in that: It also includes a liquid helium storage tank, which is connected to the first pipeline through a ninth pipeline, the connection point between the ninth pipeline and the first pipeline is located between the second valve and the liquid helium tank to be tested, and the ninth pipeline is provided with a ninth valve; the liquid helium storage tank is connected to the first pipeline through a tenth pipeline, the connection point between the tenth pipeline and the first pipeline is located between the first valve and the second valve, and the tenth pipeline is provided with a tenth valve; When in the liquid accumulation state, the third valve, the fourth valve, the seventh valve and the ninth valve are in the open state, the remaining valves are in the closed state, the flow meter is in the closed state, and the heater is in the open state.
8. The static heat leakage test device for liquid helium tank according to claim 7, characterized in that: The liquid helium storage tank is connected to the third pipeline via a thirteenth pipeline, and a fourteenth valve is disposed on the thirteenth pipeline.
9. The static heat leakage test device for liquid helium tank according to claim 1, characterized in that: It also includes an eleventh pipeline and a twelfth pipeline, one end of the eleventh pipeline is connected to the third pipeline, the other end of the eleventh pipeline is connected to one end of the heat exchanger in the cold source, the other end of the heat exchanger is connected to one end of the twelfth pipeline, the other end of the twelfth pipeline is connected to the third pipeline, an eleventh valve and a first thermometer are provided on the third pipeline, the eleventh valve is located between the connection point of the eleventh pipeline and the third pipeline and the connection point of the twelfth pipeline and the third pipeline, the first thermometer is located between the connection point of the eleventh pipeline and the third pipeline and the connection point of the second pipeline and the third pipeline, the eleventh pipeline is provided with a twelfth valve, and the twelfth pipeline is provided with a thirteenth valve.
10. The static heat leakage testing device for liquid helium tank according to claim 1, characterized in that: A second thermometer is disposed on the fourth pipeline, and the second thermometer is located between the heater and a connection point between the fifth pipeline and the fourth pipeline close to the heater.