CN114405572A - Helium low-temperature experiment test platform and method under multi-working-condition operation mode - Google Patents
Helium low-temperature experiment test platform and method under multi-working-condition operation mode Download PDFInfo
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- CN114405572A CN114405572A CN202111508780.7A CN202111508780A CN114405572A CN 114405572 A CN114405572 A CN 114405572A CN 202111508780 A CN202111508780 A CN 202111508780A CN 114405572 A CN114405572 A CN 114405572A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L7/00—Heating or cooling apparatus; Heat insulating devices
- B01L7/50—Cryostats
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/18—Means for temperature control
- B01L2300/1838—Means for temperature control using fluid heat transfer medium
- B01L2300/185—Means for temperature control using fluid heat transfer medium using a liquid as fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
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- B01L2300/1894—Cooling means; Cryo cooling
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Abstract
The invention belongs to the low-temperature superconducting technology, and particularly relates to a helium low-temperature experiment test platform and a method under a multi-working-condition operation mode. The platform and the method can provide multi-working-condition running conditions such as a supercritical helium refrigeration mode, a two-phase forced flow cooling helium liquefaction mode, a mixed mode and the like, meet the test range of a wide temperature zone, can detect low-temperature users on line or off line, and have high flexibility and strong testability.
Description
Technical Field
The invention belongs to a low-temperature superconducting technology, and particularly relates to a helium low-temperature experiment test platform and a helium low-temperature experiment test method under a multi-working-condition operation mode.
Background
In recent years, the low-temperature superconducting technology is widely applied to basic subject research, the development of low-temperature engineering is greatly promoted, and a large-scale magnetic confinement tokamak device, a superconducting accelerator device and a superconducting maglev train are matched with a large-scale helium low-temperature system.
At present, helium liquefiers with liquefying capacity from 0.5L/h to thousands of L/h and helium refrigerators with refrigerating capacity from dozens of watts to dozens of kilowatts exist in the world.
The cooling user of the cryogenic system mainly comprises a superconducting magnet, a superconducting coil, a cryogenic pump, a charging and injecting system and the like, and the refrigerating capacity and the liquefaction rate of a refrigerator determine the scale of the cryogenic system.
In a large scientific device, the use of low-temperature users in a conventional low-temperature system is often accompanied with the progress of related experiments, so that the parameter performance test of the low-temperature users is greatly limited.
For example, low temperature users are based on material performance tests, and most materials often exhibit different physical behaviors at low temperatures. The physical phenomenon of the material along with the temperature change can be known only by obtaining the physical property data of the material at each temperature point in the low-temperature area, so that the rules of different physical behaviors of the material at low temperature can be further deeply explored and understood, and the method has important significance.
Disclosure of Invention
The invention aims to provide a helium low-temperature experiment test platform under a multi-working-condition operation mode, which can generate large-flow liquid helium or supercritical helium by depending on a low-temperature system refrigerator, and can perform performance test on a low-temperature user when the low-temperature system is stopped or fails.
The technical scheme of the invention is as follows:
a helium low-temperature experiment test platform in a multi-working-condition operation mode comprises a cryostat, a helium tank and a sample cavity which are arranged in the cryostat, a heat exchanger arranged in the helium tank, a liquid helium Dewar connected with the helium tank through a pipeline, and a refrigerator connected with the helium tank through a pipeline;
four pipelines are arranged between the helium tank and the refrigerator and are respectively a helium normal-temperature transmission pipeline, a forced flow liquid helium fluid transmission pipeline, a helium low-temperature transmission pipeline and a supercritical helium fluid transmission pipeline; the supercritical helium fluid transmission pipeline is connected with the inlet of the heat exchanger;
three pipelines are arranged between the helium tank and the sample cavity and respectively comprise a sample cavity low-temperature fluid transmission pipeline, a forced flow liquid helium sample cavity transmission pipeline and a supercritical helium sample cavity transmission pipeline;
two pipelines are arranged between the helium tank and the liquid helium dewar, namely a liquid helium dewar transmission pipeline and a liquid helium dewar return pipeline.
The helium normal-temperature transmission pipeline transmits the normal-temperature helium gas d in the helium tank to the normal-temperature end of the refrigerator;
the forced flow liquid helium fluid transmission pipeline transmits the forced flow liquid helium generated by throttling of the refrigerator to the helium tank;
the helium low-temperature transmission pipeline transmits the low-temperature helium gas c in the helium tank to the low-temperature end of the refrigerator;
the supercritical helium fluid transmission pipeline transmits supercritical helium b generated by the refrigerator to the helium tank;
the sample cavity low-temperature fluid transmission pipe transmits forced flow liquid helium a or low-temperature helium c in the sample cavity to the helium tank;
the forced flow liquid helium sample cavity transmission pipeline transmits forced flow liquid helium a in the helium tank to the sample cavity;
the supercritical helium b in the helium tank is transmitted to the sample cavity by the supercritical helium sample cavity transmission pipeline;
the liquid helium Dewar type transmission pipeline is used for pressure-feeding forced flow liquid helium a stored in the liquid helium Dewar type into a helium tank in a self-pressurization mode;
and the liquid helium Dewar backflow pipeline transmits the low-temperature helium gas c in the helium tank into the liquid helium Dewar.
The cold shield is arranged outside the cryostat and is connected with the liquid nitrogen storage tank through a pipeline, and the pipeline between the cold shield and the liquid nitrogen storage tank is a liquid nitrogen transmission pipeline.
The cold shield is connected with a nitrogen evacuation pipeline.
The upper end of the cold shield is provided with an exhaust port which is communicated with the atmosphere through the exhaust port.
The sample cavity is provided with a sample injection port.
The helium low-temperature experiment testing method under the multi-working-condition operation mode is based on the testing system, and the refrigerator can provide forced flow liquid helium a or supercritical helium b which are respectively marked as a liquefaction mode and a refrigeration mode.
In the liquefaction mode, the refrigerating machine transmits helium which generates gas phase and liquid phase through the forced flow liquid helium fluid transmission pipeline and stores the helium in the helium tank; the helium tank transmits liquid helium to the sample cavity through a forced flow liquid helium sample cavity transmission pipeline.
In a refrigeration mode, the refrigerator transmits the generated supercritical helium b to a helium tank in a cryostat with a cold screen through a supercritical helium fluid transmission pipeline; supercritical helium b in the helium tank exchanges heat through a heat exchanger and is transmitted into the sample cavity through a supercritical helium sample cavity transmission pipeline; and the forced flow liquid helium a after the low-temperature user is performed in the sample cavity is transmitted into the helium tank through the low-temperature fluid transmission pipe of the sample cavity.
In the process that forced flow liquid helium a after low-temperature user is carried out in the sample cavity is transmitted into the helium tank through the low-temperature fluid transmission pipe of the sample cavity, low-temperature helium gas c passes through the low-temperature helium transmission pipeline in the helium tank to the low-temperature low-pressure end of the refrigerator, is subjected to gradual heat exchange through the refrigerator and then becomes normal-temperature helium gas d, and then returns to the normal-temperature end inlet of the refrigerator; and the normal-temperature helium gas d in the helium tank is directly transmitted to the normal-temperature end of the refrigerator through a helium normal-temperature transmission pipeline.
The two modes of the refrigerator are performed simultaneously.
When the refrigerator breaks down, the liquid helium dewar injects liquid into the helium tank through the liquid helium dewar transmission pipeline, and at the moment, only a liquid helium experiment can be carried out in the sample cavity.
The forced flow liquid helium a in the helium tank is transmitted into the sample cavity through a forced flow liquid helium sample cavity transmission pipeline; after low-temperature user experiments, liquid helium is converted into low-temperature helium gas c, then the low-temperature helium gas is conveyed into the helium tank through the sample cavity low-temperature fluid conveying pipe, and finally the low-temperature helium gas is conveyed back into the liquid helium Dewar through the liquid helium Dewar backflow pipeline.
The invention has the following remarkable effects:
the device can provide multi-working-condition running conditions such as a supercritical helium refrigeration mode, a two-phase forced flow cooling helium liquefaction mode, a mixed mode and the like, meets the test range of a 4.5K-300K wide temperature area, has a sample space within 0-500mm, can detect low-temperature users on line/off line by utilizing the low-temperature test experiment platform, has the advantages of high flexibility, strong testability, wide test range and the like, and can basically meet the test requirements of all low-temperature components and small-sized sample pieces.
According to the platform, liquid helium and supercritical helium provided by the refrigerator in different modes are firstly stored in the helium tank and then are transmitted into the sample cavity through the connected cryogenic pipeline and the valve. Meanwhile, the low-temperature helium flow returning from the sample cavity is transmitted into the helium tank and returns to different low-pressure side inlets of the refrigerator according to the difference of return gas temperature in the helium tank.
The experiment platform is more economical by adopting liquid nitrogen precooling than without liquid nitrogen precooling, and convection heat transfer is reduced under the liquid nitrogen precooling.
Both supercritical helium and forced liquid helium that can be produced within the sample chamber can be used for low temperature user performance testing. Supercritical helium pressure and temperature fluctuation are uniform, but flow rate is small, forced flow liquid helium pressure and temperature fluctuation are large, and flow rate is also large.
When the system of the refrigerator has a fault, the liquid helium can be conveyed into the helium tank by adopting a liquid helium Dewar pressure conveying mode, and only a liquid helium experiment can be carried out in the sample cavity at the moment.
In addition, under the normal operation condition, the liquid helium conveyed by the liquid helium dewar can be regulated to keep the liquid level in the helium tank stable.
Drawings
FIG. 1 is a schematic view of a helium low-temperature experimental test platform under a working condition operation mode;
in the figure: 1. a refrigerator; 2. a cryostat; 3. a helium tank; 4. a heat exchanger; 5. a sample chamber; 6. liquid helium Dewar 7. liquid nitrogen storage tank; 8. cooling the screen; 9. atmospheric air; 10. a sample injection port;
wherein the fluid state is as follows: a. forced flow liquid helium b, supercritical helium c, low-temperature helium d, normal-temperature helium e, liquid nitrogen f and nitrogen;
the fluid transport pipeline and the process are as follows:
1-3a. a forced flow liquid helium fluid transmission pipeline, which transmits the forced flow liquid helium a generated by throttling of the refrigerator 1 to a helium tank 3;
1-3b, a supercritical helium fluid transmission pipeline, which transmits the supercritical helium b generated by the refrigerator 1 to a helium tank 3;
3-5a. a forced flow liquid helium sample cavity transmission pipeline, which transmits the forced flow liquid helium a in the helium tank 3 to the sample cavity 5;
3-5b, a supercritical helium sample cavity transmission pipeline, which transmits the supercritical helium b in the helium tank 3 to the sample cavity 5 through the heat exchanger 4;
6-3a. a liquid helium Dewar transmission pipeline, which is used for pressure-feeding forced flow liquid helium a stored in the liquid helium Dewar 6 into the helium tank 3 in a self-pressurization mode;
5-3a. a sample cavity low-temperature fluid conveying pipe;
according to the heat exchange effect in the sample cavity 5, the helium flow property in the cavity can be simultaneously the forced flow liquid helium a or the low-temperature helium c, and the forced flow liquid helium a or the low-temperature helium c in the sample cavity 5 is transmitted to the helium tank 3;
3-1c, a helium low-temperature transmission pipeline, which transmits the low-temperature helium gas c in the helium tank 3 to the low-temperature end of the refrigerator 1;
3-1d, a helium normal-temperature transmission pipeline, which transmits the normal-temperature helium gas d in the helium tank 3 to the normal-temperature end of the refrigerator;
3-6c, a liquid helium Dewar backflow pipeline, which is used for transmitting the low-temperature helium gas c in the helium tank 3 to the liquid helium Dewar 6;
7-8e, a liquid nitrogen transmission pipeline, which transmits liquid nitrogen e from the liquid nitrogen storage tank 7 to the cold screen 8 of the cryostat 2;
8-9f nitrogen evacuation line to evacuate nitrogen f to atmosphere 9 at the exit of cold shield 8 in cryostat 2.
Detailed Description
The invention is further illustrated by the accompanying drawings and the detailed description.
As shown in fig. 1, a helium cryogenic experiment test platform under a multi-operating-condition operation mode comprises a cryostat 2, a helium tank 3 and a sample chamber 5 which are arranged in the cryostat 2, a heat exchanger 4 arranged in the helium tank 3, a liquid helium dewar 6 connected with the helium tank 3 through a pipeline, and a refrigerator 1 connected with the helium tank 3 through a pipeline;
four pipelines are arranged between the helium tank 3 and the refrigerator 1, namely a helium normal-temperature transmission pipeline 3-1d, a forced flow liquid helium fluid transmission pipeline 1-3a, a helium low-temperature transmission pipeline 3-1c and a supercritical helium fluid transmission pipeline 1-3 b;
the supercritical helium fluid transmission pipeline 1-3b is connected with an inlet of the heat exchanger 4;
three pipelines are arranged between the helium tank 3 and the sample cavity 5, namely a sample cavity low-temperature fluid transmission pipeline 5-3a, a forced flow liquid helium sample cavity transmission pipeline 3-5b and a supercritical helium sample cavity transmission pipeline 3-5 a;
two pipelines are arranged between the helium tank 3 and the liquid helium dewar 6, namely a liquid helium dewar transmission pipeline 6-3a and a liquid helium dewar return pipeline 3-6c.
The cold screen 8 is arranged outside the cryostat 2, the cold screen 8 is connected with the liquid nitrogen storage tank 7 through a pipeline, and the pipeline between the cold screen 8 and the liquid nitrogen storage tank 7 is a liquid nitrogen transmission pipeline 7-8e.
The cold screen 8 is connected with a nitrogen evacuation pipeline 8-9 f;
the upper end of the cold shield 8 is provided with an exhaust port which is communicated with the atmosphere 9;
the sample chamber 5 is provided with a sample injection port 10.
First, a sample is put into the sample chamber 5 through the sample injection port 10. The liquid nitrogen storage tank 7 transmits liquid nitrogen to the cold screen 8 of the cryostat 2 through liquid nitrogen transmission pipelines 7-8e for precooling, so that the heat exchange of the whole experiment platform is reduced, and after the liquid nitrogen is converted into nitrogen, the nitrogen is discharged into the atmosphere 9 from an air outlet at the upper end of the cold screen 8 through nitrogen discharge pipelines 8-9 f;
in the liquefaction mode, the refrigerator 1 can provide gas-liquid mixed two-phase forced flow cooling liquid helium, called forced flow liquid helium a for short. A core equipment refrigerating machine 1 in the cryogenic system generates gas-liquid two-phase helium at an outlet through a throttling valve and stores the helium in a helium tank 3 in a cryostat 2 with a cold screen 8 through a forced flow liquid helium mass transmission pipeline 1-3a after multi-stage heat exchange and turbo expansion, the property of the forced flow liquid helium a is about 1.3bar @4.5K, and the helium tank 3 transmits the liquid helium to a sample cavity 5 through a forced flow liquid helium sample cavity transmission pipeline 3-5 a;
in the cooling mode, the refrigerator 1 can supply single-phase fluid supercritical helium, hereinafter referred to as supercritical helium b. Supercritical helium b generated by the refrigerator 1 is transmitted into a helium tank 3 in a cryostat 2 with a cold screen 8 through a valve regulation and through supercritical helium fluid transmission pipelines 1-3b, the property of the supercritical helium b is about 3.5bar @5.5K, and the supercritical helium b in the helium tank 3 is subjected to heat exchange through a heat exchanger 4 and is transmitted into a sample cavity 5 through supercritical helium sample cavity transmission pipelines 3-5b. After the experiment of the low-temperature user in the sample cavity 5, the returned forced flow liquid helium a is transmitted into the helium tank 3 through the sample cavity low-temperature fluid transmission pipe 5-3a. After heat exchange, the temperature of helium in the helium tank 3 is different (4.5K-300K) due to the difference of reflux temperature. The low-temperature helium gas c passes through a helium low-temperature transmission pipeline 3-1c in the helium tank 3 to reach a low-temperature low-pressure end of the refrigerator 1, is changed into normal-temperature helium gas d after being subjected to gradual heat exchange by the refrigerator 1 by utilizing recovered cold quantity, and then returns to a normal-temperature end inlet of the refrigerator 1. The normal temperature helium gas d in the helium tank 3 is directly transmitted to the normal temperature end of the refrigerator 1 through a helium normal temperature transmission pipeline 3-1d.
When the refrigerator 1 is in the mixed mode of the two states, the refrigerator can generate forced flow liquid helium through the throttle valve and can also generate supercritical helium through the regulating valve. Both processes can be performed simultaneously.
The test platform can completely and independently operate, and when the refrigerator 1 breaks down, the liquid helium Dewar 6 fills liquid into the helium tank 3 through the liquid helium Dewar transmission pipeline 6-3 a;
at this time, only the liquid helium test and not the supercritical helium test can be performed in the sample chamber 5.
At the moment, the forced flow liquid helium a in the helium tank 3 is transmitted into the sample cavity 5 through a forced flow liquid helium sample cavity transmission pipeline 3-5 a; after low-temperature user experiments, liquid helium is converted into low-temperature helium gas c, then the low-temperature helium gas is conveyed into the helium tank 3 through the sample cavity low-temperature fluid conveying pipe 5-3a/c, and finally the low-temperature helium gas is conveyed back into the liquid helium Dewar 6 through the liquid helium Dewar backflow pipeline 3-6c.
Depending on the heat exchange within the sample chamber 5, the properties of the helium flow within the chamber may be present as forced liquid helium a or cryogenic helium c.
The fluid can only pass through 6-3 a-3-5 a-5-3 a-3-6 c.
The liquid nitrogen system belongs to an auxiliary external fluid input system and can work independently. In order to ensure effective experiment development, a set of liquid nitrogen system can be preferably configured. In a liquid nitrogen system, a liquid nitrogen transmission pipeline 7-8e transmits liquid nitrogen e from a liquid nitrogen storage tank 7 to a cold screen 8 of a cryostat 2; the nitrogen evacuation pipes 8 to 9f evacuate the nitrogen f at the outlet of the cold screen 8 to the atmosphere 9.
Claims (13)
1. The utility model provides a helium low temperature experiment test platform under multiplex condition operational mode which characterized in that: comprises a cryostat (2), a helium tank (3) and a sample cavity (5) which are arranged in the cryostat (2), a heat exchanger (4) which is arranged in the helium tank (3), a liquid helium Dewar (6) which is connected with the helium tank (3) through a pipeline, and a refrigerator (1) which is connected with the helium tank (3) through a pipeline;
four pipelines are arranged between the helium tank (3) and the refrigerator (1), and are respectively a helium normal-temperature transmission pipeline, a forced flow liquid helium fluid transmission pipeline, a helium low-temperature transmission pipeline and a supercritical helium fluid transmission pipeline; the supercritical helium fluid transmission pipeline is connected with an inlet of the heat exchanger (4);
three pipelines are arranged between the helium tank (3) and the sample cavity (5), and are respectively a sample cavity low-temperature fluid transmission pipeline, a forced flow liquid helium sample cavity transmission pipeline and a supercritical helium sample cavity transmission pipeline;
two pipelines are arranged between the helium tank (3) and the liquid helium dewar (6), and are respectively a liquid helium dewar transmission pipeline and a liquid helium dewar return pipeline.
2. The helium cryogenic experiment test platform under the multi-working condition operation mode as claimed in claim 1, characterized in that:
the helium normal-temperature transmission pipeline transmits the normal-temperature helium gas d in the helium tank (3) to the normal-temperature end of the refrigerator (1);
the forced flow liquid helium fluid transmission pipeline transmits the forced flow liquid helium generated by throttling the refrigerator (1) to the helium tank (3);
the helium low-temperature transmission pipeline transmits low-temperature helium c in the helium tank (3) to the low-temperature end of the refrigerator (1);
the supercritical helium fluid transmission pipeline transmits supercritical helium b generated by the refrigerator (1) to the helium tank (3);
the sample cavity low-temperature fluid transmission pipe transmits forced flow liquid helium a or low-temperature helium c in the sample cavity (5) to the helium tank (3);
the forced flow liquid helium sample cavity transmission pipeline transmits forced flow liquid helium a in the helium tank (3) to the sample cavity (5);
the supercritical helium sample cavity transmission pipeline transmits the supercritical helium b in the helium tank (3) to the sample cavity (5);
the liquid helium Dewar transmission pipeline is used for pressure-feeding forced flow liquid helium a stored in the liquid helium Dewar (6) into the helium tank (3) in a self-pressurization mode;
the liquid helium Dewar backflow pipeline transmits low-temperature helium gas c in the helium tank (3) to the liquid helium Dewar (6).
3. The helium cryogenic experiment test platform under the multi-working condition operation mode as claimed in claim 2, characterized in that: the low-temperature thermostat (2) outside be equipped with cold screen (8), cold screen (8) pass through pipe connection liquid nitrogen storage tank (7), the pipeline between cold screen (8) and liquid nitrogen storage tank (7) is liquid nitrogen transmission pipeline.
4. The helium cryogenic experiment test platform under the multi-working condition operation mode as claimed in claim 3, characterized in that: the cold shield (8) is connected with a nitrogen evacuation pipeline.
5. The helium cryogenic experiment test platform under the multi-working condition operation mode as claimed in claim 3, characterized in that: and an exhaust port is arranged at the upper end of the cold shield (8) and is communicated with the atmosphere (9) through the exhaust port.
6. The helium cryogenic experiment test platform under the multi-working condition operation mode as claimed in claim 1, characterized in that: the sample cavity (5) is provided with a sample injection port (10).
7. A helium low-temperature experiment testing method in a multi-working-condition operation mode, which is based on the testing system as claimed in claim 1, and is characterized in that: the refrigerator (1) can provide forced flow liquid helium a or supercritical helium b which are respectively marked as a liquefaction mode and a refrigeration mode.
8. The helium cryogenic experiment testing method under the multi-working-condition operation mode as claimed in claim 7, characterized in that: in the liquefaction mode, the refrigerator (1) transmits and stores helium which generates gas phase and liquid phase through the forced flow liquid helium fluid transmission pipeline in the helium tank (3); the helium tank (3) transmits liquid helium to the sample cavity (5) through a forced flow liquid helium sample cavity transmission pipeline.
9. The helium cryogenic experiment testing method under the multi-working-condition operation mode as claimed in claim 7, characterized in that: in a refrigeration mode, the refrigerator (1) transmits the generated supercritical helium b to a helium tank (3) in a cryostat (2) with a cold screen (8) through a supercritical helium fluid transmission pipeline; supercritical helium b in the helium tank (3) exchanges heat through a heat exchanger (4) and is transmitted into a sample cavity (5) through a supercritical helium sample cavity transmission pipeline; the forced flow liquid helium a after low-temperature user is carried out in the sample cavity (5) is transmitted into the helium tank (3) through the low-temperature fluid transmission pipe of the sample cavity.
10. The helium cryogenic experiment testing method under the multi-working-condition operation mode as claimed in claim 9, characterized in that: in the process that forced flow liquid helium a subjected to low-temperature user in the sample cavity (5) is transmitted into the helium tank (3) through the sample cavity low-temperature fluid transmission pipe, low-temperature helium gas c passes through a helium low-temperature transmission pipeline in the helium tank (3) to the low-temperature low-pressure end of the refrigerating machine (1), is subjected to gradual heat exchange by the refrigerating machine (1) to become normal-temperature helium gas d, and then returns to the normal-temperature end inlet of the refrigerating machine (1); and the normal-temperature helium gas d in the helium tank (3) is directly transmitted to the normal-temperature end of the refrigerator (1) through a helium normal-temperature transmission pipeline.
11. The helium cryogenic experiment testing method under the multi-working-condition operation mode as claimed in claim 7, characterized in that: the two modes of the refrigerator (1) are performed simultaneously.
12. The helium cryogenic experiment testing method under the multi-working-condition operation mode as claimed in claim 7, characterized in that: when the refrigerator (1) breaks down, the liquid helium Dewar (6) fills the helium tank (3) with liquid through the liquid helium Dewar transmission pipeline, and at the moment, only a liquid helium experiment can be carried out in the sample cavity (5).
13. The helium cryogenic experiment testing method under the multi-working-condition operation mode as claimed in claim 12, characterized in that: the forced flow liquid helium a in the helium tank (3) is transmitted into the sample cavity (5) through a forced flow liquid helium sample cavity transmission pipeline; after low-temperature user experiments, liquid helium is converted into low-temperature helium gas c, the low-temperature helium gas is conveyed into the helium tank (3) through the sample cavity low-temperature fluid conveying pipe, and finally the low-temperature helium gas is conveyed back into the liquid helium Dewar (6) through the liquid helium Dewar backflow pipeline.
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