Filling, separating, purifying and recycling system and filling, separating, purifying and recycling method

Abstract

The invention provides a filling separation purification recovery system and a filling separation purification recovery method.The filling separation purification recovery system comprises a first gas filling device and a second gas filling device which are used for being communicated with a refrigerating system and are configured to fill a first gas and a second gas into the refrigerating system to form mixed gas; and the gas purification and recovery device is used for being communicated with the refrigerating system and is configured to separate out and store the first gas in the mixed gas. According to the filling, separating, purifying and recycling system, fixed-proportion mixed filling of 3He gas and 4He gas can be achieved, purification and impurity removal are conducted on the 3He gas under the condition of no leakage, the 3He gas is recycled to a 3He recycling bottle, and the problems of leakage and pollution caused by the fact that the 3He gas is stored in a refrigerating machine are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of low temperature refrigeration, and more specifically to a filling separation purification recovery system and a filling separation purification recovery method. Background Art

[0002] Under low temperature conditions, 3 The non-ideality of He gas is much smaller than 4 He gas, use 3 He gas or 3 He- 4 He mixed gas as a refrigerator working fluid can effectively improve the performance of the refrigerator. Therefore, in low temperature refrigeration technology 3 He is a very critical working fluid. 3 There are very high requirements for the purity of He gas. For example, a two-stage thermally coupled pulse tube refrigerator relies on heat exchange with heat recovery materials in micron-sized gaps to obtain cooling capacity; a throttling refrigerator relies on micron-sized throttling elements to throttle expansion to obtain cooling capacity, etc. If the internal gas is impure, the mixed impurities (including nitrogen, oxygen, hydrogen, water vapor, etc.) will turn into solids at low temperatures and clog key components of the refrigerator, such as heat recovery materials and throttling elements, thereby greatly affecting the performance of the refrigerator. Reducing the content of impurity gases and increasing the operating life of the refrigerator is a key technology in the field of low-temperature refrigeration. In addition, 3 He gas is very scarce and expensive. To avoid waste in the experiment, 3 He gas needs to be recovered in a tank independent of the refrigerator to avoid leakage or contamination. 3 He- 4 He mixed working medium refrigerator, in order to reduce 3 He recovery bottle volume, and ensure that when it is used again, 3 He- 4 The ratio of He mixed working fluid is accurate. In the purification and recovery process, not only the mixed impurities should be removed, but also 4 He gas, therefore, in order to ensure that the performance of the refrigerator is not affected, 3 The separation, purification and impurity removal of He gas is very important. Currently, there is no detailed information published at home and abroad. 3 He- 4 He mixed gas filling, separation, purification and recovery scheme. Summary of the invention

[0003] In view of the above problems, the present invention provides a filling separation purification recovery system and a filling separation purification recovery method to achieve 3 He gas and 4 He gas is mixed and filled in a certain proportion, and the 3 He gas is purified and impurities removed,3 He gas recovery to 3 He recycles the bottle to avoid 3 He gas stored in the refrigerator causes leakage and pollution problems.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] The present invention provides a filling, separation, purification and recovery system, comprising:

[0006] A first gas filling device and a second gas filling device connected to the refrigeration system are configured to respectively fill the first gas and the second gas into the refrigeration system to form a mixed gas; and a gas purification and recovery device connected to the refrigeration system is configured to separate and store the first gas in the mixed gas.

[0007] A preferred solution is that the gas purification and recovery device includes a cold trap, a circulation pump, a first compressor and a first recovery bottle which are connected in series through pipelines; the gas outlet end of the cold trap is connected to the gas inlet end of the circulation pump and the refrigeration system through branch pipelines.

[0008] A preferred embodiment is that the first gas filling device includes a first gas cylinder and a second compressor connected to the gas outlet end of the first gas cylinder through a pipeline; the gas outlet end of the second compressor is connected to the gas inlet end of the cold trap; and the gas outlet end of the first gas cylinder is connected to the gas inlet end of the cold trap.

[0009] A preferred embodiment is that the second gas filling device includes a second gas cylinder, an air cavity connected to the gas outlet end of the second gas cylinder through a pipeline, and a first pressure sensor for obtaining the gas pressure in the air cavity, and the gas outlet end of the air cavity is connected to the refrigeration system, the air inlet end of the circulation pump and the gas outlet end of the cold trap through branch pipelines.

[0010] A preferred solution is that the filling separation purification recovery system also includes a vacuum pump for evacuating the filling separation purification recovery system and the refrigeration system.

[0011] A preferred solution is that the filling, separation, purification and recovery system also includes a plurality of valves for controlling the on-off of pipelines.

[0012] The preferred solution is that the filling separation purification recovery system also includes a fifth pressure sensor for obtaining the gas pressure in the first recovery bottle, a second pressure sensor and a fourth pressure sensor for obtaining the pipeline pressure, and a third pressure sensor for obtaining the charging pressure of the refrigeration system.

[0013] The present invention also provides a filling separation purification recovery method based on the filling separation purification recovery system as described above, the method comprising the following steps:

[0014] Evacuate the charging separation purification recovery system and refrigeration system;

[0015] Filling the first gas and the second gas into the refrigeration system through the first gas filling device and the second gas filling device to form a mixed gas;

[0016] Separating, purifying and storing the first gas in the refrigeration system by a gas purification and recovery device;

[0017] The liquid helium and solid impurities in the filling separation purification recovery system are discharged by heating.

[0018] The preferred solution is that separating and purifying the first gas in the refrigeration system and storing it by the gas purification and recovery device further comprises: the gas purification and recovery device comprises a cold trap, a circulation pump, a first compressor and a first recovery bottle connected in series through a pipeline; cooling the cold trap so that the temperature at the bottom of the cold trap drops to the temperature of liquid helium;

[0019] Turn on the circulation pump and the first compressor to circulate the mixed gas along the pipeline, the second gas is liquefied at the cold trap, and other impurities form solid impurities at the cold trap, thereby completing the separation and purification of the first gas;

[0020] The power of the circulation pump and the first compressor is adjusted so that the separated and purified first gas enters the first recovery bottle through the pipeline via the circulation pump, thereby completing the recovery and storage of the first gas.

[0021] The preferred solution is that the discharge of the liquid helium and solid impurities in the filling separation purification recovery system by heating further comprises: heating the cold trap to convert the liquid helium and solid impurities in the cold trap into gaseous state and discharge them.

[0022] The beneficial effects of the present invention are:

[0023] The present invention designs a set of independent refrigerator 3 He- 4 He mixed gas filling separation purification recovery system; 3 He- 4 He mixed gas filling: 3 He gas and 4 He gas filling pipeline is separated, 3 There are two He gas filling pipelines, one is 3 He gas cylinders are directly charged to the refrigerator, one is 3 The He gas cylinder is pressurized and charged to the refrigerator by the second compressor. The pressure sensor is installed to monitor the charging pressure in real time. 3 He gas and 4 A fixed proportion of He gas is mixed and filled. 4 The establishment of He gas cavity can avoid 4 He gas filling4 The problem of contamination of gas cylinders.

[0024] exist 3 He- 4 He mixed gas separation and purification: Compared with the internal gas filter, the present invention avoids the problem of being placed inside the refrigerator to generate flow resistance to the working medium, and also avoids 3 He gas stored inside the refrigerator causes leakage and contamination. This invention uses liquid helium to purify 3 He, no porous adsorption material is used, avoiding the risk of releasing impurities into the refrigerator after the adsorption material is saturated, avoiding the problem of reactivation of the adsorption material, and the purification process can be continuously cycled for a long time, passing through the cold trap multiple times to completely remove 4 He and impurity gases (including nitrogen, oxygen, hydrogen, water vapor, etc.).

[0025] exist 3 He- 4 He mixed gas recovery: The main part of the recovery is to adjust the power of the circulation pump and the first compressor after the system purification is completed, so that the refrigerator, gas cavity and pipeline 3 He gas enters through the circulation pump 3 He recycled bottles; in addition, 3 After the He gas cylinder is pressurized by the second compressor to charge the refrigerator, 3 He gas is pure and can be directly recycled. The circulating pump and booster compressor used in the system are oil-free and will not introduce other impurities. 3 He gas recovery to 3 After the He is recovered in the bottle, it is convenient for the disassembly, assembly and transportation of the refrigerator. In addition, the present invention is connected with the refrigerator to build a vacuum pipeline for the entire system, which can complete the vacuuming, fixed-proportion mixing and inflation, separation, purification, recycling and storage of the entire system. 3 All his work. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The specific implementation modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] Figure 1 It is a schematic diagram of the cooperation between the present invention and a refrigeration system. DETAILED DESCRIPTION

[0028] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0029] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0030] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0031] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0032] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0033] by 3 He- 4 He mixed gas as an example, in order to prevent leakage 3 He gas is purified and impurities are removed, the present invention provides a method for 3 He- 4 He mixed gas filling separation purification recovery system. Figure 1 As shown, the filling separation purification recovery system specifically includes: a first gas filling device and a second gas filling device connected to the refrigeration system, which are configured to respectively 3 He gas and 4 He gas is injected into the refrigeration system to form a mixed gas, the refrigeration system comprising a refrigerator and a vacuum dewar (vacuum cover); and a gas purification and recovery device connected to the refrigeration system, configured to remove He gas from the mixed gas. 3 He gas is separated and stored. 3 He- 4 He mixed gas as the working fluid of various refrigerators filling separation purification recovery. In addition to completing the refrigerator vacuum, 4 He gas filling, 3 In addition to He gas filling, gas purification and recovery operations, it can also achieve high pressure in any proportion 3 He- 4 He mixed working medium refrigerator mixed charge, 3 Separation and purification of He gas, high purity 3 He gas recovery and storage. 3 He- 4 He mixed gas filling separation purification recovery system 3 He- 4The experimental system of the He mixed working medium refrigerator is combined to make the entire experimental system more efficient and more compact. 3 He- 4 He mixed working fluid refrigerator experiment and recovery, can also complete the single working fluid refrigerator ( 4 He refrigerator and 3 Experiment and recovery of He refrigerator).

[0034] Reference Figure 1 As shown, the present invention includes a first compressor, a second compressor, a circulation pump, a vacuum pump, a cold trap, a first recovery bottle, a first gas bottle, a second gas bottle, a gas cavity, five pressure sensors ①-⑤, a valve ap (including a needle valve f, pressure reducing valves i, k), and pipelines 1-32; the first recovery bottle is 3 He recovery bottle, the first gas bottle is 3 He gas cylinder, the second gas cylinder is 4 Heating cylinders.

[0035] In a specific embodiment, the gas purification and recovery device includes a cold trap, a circulation pump, a first compressor and a 3 The outlet of the cold trap is connected to the inlet of the circulating pump and the refrigeration system through branch pipes. The cold trap is filled with liquid helium. 3 The separation and purification of He provides a low-temperature environment; the purification coil is divided into a spiral coil and a condensation chamber. 3 He recovery bottles are used to store high-purity He after purification and impurity removal. 3 The volume of He gas is limited by two factors. Excessive volume leads to low pipeline pressure during purification, which makes 4 He condensation temperature is reduced, increasing complete condensation purification 4 He difficulty; small volume leads to high pipeline pressure, increasing the recovery process to fully recover 3 He difficulty, so it is necessary to calculate the appropriate 3 The volume and size of the recovery bottle.

[0036] Furthermore, the first gas filling device comprises 3 He gas cylinders and pipes 3 The gas outlet of the He gas cylinder is connected to a second compressor; the gas outlet of the second compressor is connected to the gas inlet of the cold trap; 3 The outlet of the He gas cylinder is connected to the inlet of the cold trap, which includes a purification coil and a condensation chamber. The first compressor and the second compressor are both booster compressors, which are oil-free linear valve compressors, the circulating pump is a mechanical dry pump, and the vacuum pump is composed of a mechanical dry pump and a molecular pump to avoid contaminating the pipeline and introducing impurities.

[0037] Furthermore, the second gas filling device comprises 4 He gas cylinder, through the pipeline and 4 The gas outlet of the He gas cylinder is connected to the gas cavity and the first pressure sensor ① for obtaining the gas pressure in the gas cavity. The gas outlet of the gas cavity is connected to the refrigeration system, the gas inlet of the circulation pump and the gas outlet of the cold trap through branch pipelines. 4 The air cavity on the He filling pipe can avoid 4 He filling 4 He gas cylinders 3 and gas pollution.

[0038] In a specific embodiment, the filling separation purification recovery system further includes a vacuum pump for evacuating the filling separation purification recovery system and the refrigeration system.

[0039] In a specific embodiment, the filling separation purification recovery system also includes a plurality of valves for controlling the on-off of the pipeline. Specifically, a needle valve is arranged in front of the circulation pump, and the pressure in front of the circulation pump is adjusted by adjusting the opening of the needle valve, which is beneficial to purifying the coil. 4 Separation and purification of He; other types of valves or flow resistance components can also be used instead of needle valves to control pipeline pressure.

[0040] In a specific embodiment, the filling, separation, purification and recovery system also includes a fifth pressure sensor ⑤ for obtaining the gas pressure in the first recovery bottle, a second pressure sensor ② and a fourth pressure sensor ④ for obtaining the pipeline pressure, and a third pressure sensor ③ for obtaining the charging pressure of the refrigeration system.

[0041] In addition, the present invention also provides a filling separation purification recovery method based on the filling separation purification recovery system as described above, the method comprising the following steps: evacuating the filling separation purification recovery system and the refrigeration system; respectively injecting the gas into the filling separation purification recovery system and the refrigeration system through the first gas filling device and the second gas filling device; 3 He gas and 4 He gas is injected into the refrigeration system to form 3 He- 4 He mixed gas; through the gas purification and recovery device to the refrigeration system 3 He gas is separated, purified and stored; liquid helium and solid impurities in the filling, separation, purification and recovery system are discharged by heating.

[0042] This invention is aimed at the internal working medium after the refrigerator is shut down. 3 The specific operation process of separation, purification and recovery of He is as follows:

[0043] Vacuum before the first experiment

[0044] Open valves a, b, c, d, e, f, g, h, j, l, m, n, o, p (all except i and k, where f is a needle valve) to allow the vacuum pump to evacuate the entire experimental system, which includes the charging separation purification recovery system and the refrigeration system. The vacuum pump evacuates the refrigerator vacuum cover through pipelines 27, 25, 24 and valve m; evacuates the cold trap through pipelines 27 and 26 and valve n; evacuates the cold trap through pipelines 28, 31, 32, 28, 29, 30 and 27, 25, 23, 22. 3 The He recovery bottle, the gas cavity and the entire experimental system were evacuated.

[0045] When the vacuum pump indication reaches the requirement, close valves a, b, c, d, e, f, g, h, j, l, o, and p, and keep valves m and n open, so that the vacuum pump can continuously evacuate the vacuum cover and cold trap of the refrigerator.

[0046] First experiment 3 He- 4 He mixed gas filling

[0047] 3 He gas filling

[0048] (1) If 3 If the pressure of the He gas cylinder is higher than the pressure required by the refrigerator, you only need to open valves i (pressure reducing valve), c, b, and a. 3 He gas reaches the refrigerator through pipelines 8, 7, 6, 5, 4, 3, 2, 1, and the third pressure sensor ③ monitors the refrigerator charging pressure in real time. After the charging is completed, valves i, c, b, and a are closed.

[0049] (2) If 3 If the pressure of the He gas cylinder is lower than the pressure required by the refrigerator, you need to open valves i (pressure reducing valve), d, e, b, and a. 3 He gas reaches the second compressor through pipelines 9 and 11, and after being pressurized by the second compressor, reaches the refrigerator through pipelines 12, 6, 5, 4, 3, 2, and 1. The third pressure sensor ③ monitors the inflation pressure of the refrigerator in real time. After inflation is completed, the second compressor and pipeline need to be 3 He recovery, at this time, the liquid helium is passed into the cold trap to reduce the temperature at the bottom of the purification coil to the liquid helium temperature, close valves i, d, a, open valves f, g, start the circulation pump and the first compressor, 3 He working fluid is recovered from the second compressor along pipelines 12, 6, 5, 4, 18, 17, 16, 15, 14, 13 to 3 In the He recovery bottle, the second pressure sensor ② monitors the pressure of the recovery pipeline in real time. After the recovery is completed, the circulation pump, booster compressor and valves e, b, f, and g are closed.

[0050] 4 He gas filling

[0051] Open valve k to 4 He gas from 4 He gas cylinder is filled into the air cavity through pipeline 21. After the air cavity is filled, valve k is closed and valves j and a are opened to make the air cavity 4 He is charged into the refrigerator through pipelines 20, 19, 3, 2, and 1. When the reading of the third pressure sensor ③ stabilizes, the charging is completed and valves j and a are closed.

[0052] Refrigerator and air chamber 3 Separation and purification of He gas

[0053] After the experiment is completed, open valves a, b, c, h, and j to make the refrigerator and the air chamber 3 He- 4 He mixed gas diffuses and fills the purification coil in the cold trap. 3 He recovery bottle and pipelines 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 13, 18, 19, 20. Liquid helium is passed into the cold trap to reduce the temperature at the bottom of the purification coil to the liquid helium temperature.

[0054] Start the circulation pump and the first compressor, slowly open the needle valve f so that the circulation pump inlet pressure meets its operating conditions, and the fourth pressure sensor ④ and the second pressure sensor ② respectively monitor the pressure of the pipeline before and after the needle valve in real time. At the same time, open valve g to 3 He- 4 He mixed working fluid along the first compressor, 3 After the purification coils of the He recovery bottle and cold trap are fully circulated, 4 After the He gas is liquefied at the cold trap and other impurities form solid impurities at the cold trap, the purification process ends and valve h is closed.

[0055] High purity 3 He gas recovery

[0056] After closing valve h, adjust the power of the circulating pump and booster compressor I, and at the same time adjust the opening of needle valve f to ensure that the circulating pump meets the use requirements, so that the pipeline 3 He gas enters through the circulation pump through pipelines 10, 9, 8, 7, 6, 5, 4, 18, and 17 3 He recovery bottle; inside refrigerator 3 He gas enters through pipelines 1, 2, 3, 18, and 17 through the circulation pump 3 He recovery bottle; in the air cavity 3 He gas enters through pipelines 20, 19, 18, and 17 through the circulation pump 3The fourth pressure sensor ④ and the second pressure sensor ② respectively monitor the pressure of the pipelines before and after the needle valve in real time. After the recovery is completed, all valves are closed, and then the circulation pump and the first compressor are closed.

[0057] Discharge of liquid helium and solid impurities in the purification coil

[0058] Purification 3 During the process, 3 A large amount of He mixed 4 Helium will liquefy and accumulate in the condensation chamber at the bottom of the purification coil; in addition, a small amount of oxygen, nitrogen and other impurities will condense into solid oxygen, solid nitrogen, etc. and deposit in the purification coil. The accumulation of liquid helium and solid impurities may block the pipeline. 3 After the He recovery is completed, it is necessary to discharge the He in the purification coil. 4 And working fluid and other impurities.

[0059] The specific operation is: open valves b and a to heat the purification coil, so that the liquid helium and solid impurities in the purification coil are converted into gaseous state and discharged from valve a through pipelines 5, 4, and 3.

[0060] Since the specific operation process of the vacuuming and mixed gas filling steps in the second and subsequent experiments is different from that in the first experiment, a detailed description is given below:

[0061] Vacuum before the second and subsequent experiments

[0062] Air cavity 4 The amount of He gas meets the experimental requirements

[0063] Open valves a, b, c, d, e, f, m, n, and o to allow the vacuum pump to 3 The experimental system outside the He recovery bottle and the gas cavity is evacuated. The vacuum pump evacuates the vacuum cover of the refrigerator through pipelines 27, 25, and 24, through valve m; evacuates the cold trap through pipelines 27 and 26, through valve n; and evacuates the experimental system through the path of pipelines 28, 29, and 30.

[0064] When the vacuum pump reading reaches the requirement, close valves a, b, c, d, e, f, and o, and keep valves m and n open, so that the vacuum pump can continuously evacuate the vacuum cover and cold trap of the refrigerator.

[0065] Air cavity 4 The amount of He gas does not meet the experimental requirements

[0066] Open valves a, b, c, d, e, f, j, l, m, n, o (all except i, k, h, g, p) to allow the vacuum pump to 3The entire experimental system outside the He recovery bottle is evacuated (including the air cavity). The vacuum pump evacuates the refrigerator vacuum cover through pipelines 27, 25, and 24 through valve m; evacuates the cold trap through pipelines 27 and 26 through valve n; and evacuates the air cavity and the experimental system through pipelines 28, 29, and 30 and 27, 25, 23, and 22.

[0067] When the vacuum pump indication reaches the requirement, close valves a, b, c, d, e, f, j, l, and o, and keep valves m and n open, so that the vacuum pump can continuously evacuate the vacuum cover and cold trap of the refrigerator.

[0068] Second and subsequent experiments 3 He- 4 He mixed gas filling

[0069] charge 3 He

[0070] First, pass liquid helium into the cold trap to reduce the temperature at the bottom of the purification coil to liquid helium temperature, open valves h, d, e, b, and a, and start the second compressor. 3 The He working fluid passes through the second compressor to the purification coil and is purified again before entering the refrigerator.

[0071] (1) When the reading of the third pressure sensor ③ reaches 3 When testing the filling pressure, close valves h, d, e, b, and a, and then close the second compressor.

[0072] (2) When the reading of the third pressure sensor ③ stabilizes, it does not reach 3 When the He test filling pressure is reached, close valve h and open valve i. 3 The He cylinder continues to inflate. When the third pressure sensor ③ reaches 3 When testing the filling pressure, close valves h, d, e, b, and a, and then close the second compressor.

[0073] charge 4 He

[0074] With the first experiment 4 The He filling operation is the same. Open valve K to 4 Why 4 He gas cylinder is filled into the air cavity through pipeline 21. After the air cavity is filled, valve k is closed and valves j and a are opened to make the air cavity 4 He is charged into the refrigerator through pipelines 20, 19, 3, 2, and 1. When the reading of the third pressure sensor ③ stabilizes, the charging is completed and valves j and a are closed.

[0075] In summary, the present invention designs a set of independent external refrigerator 3 He-4 He mixed gas filling separation purification recovery system; 3 He- 4 He mixed gas filling: 3 He gas and 4 He gas filling pipeline is separated, 3 There are two He gas filling pipelines, one is 3 He gas cylinders are directly charged to the refrigerator, one is 3 The He gas cylinder is pressurized and charged to the refrigerator by the second compressor. The pressure sensor is installed to monitor the charging pressure in real time. 3 He gas and 4 A fixed proportion of He gas is mixed and filled. 4 The establishment of He gas cavity can avoid 4 He gas filling 4 The problem of contamination of gas cylinders.

[0076] exist 3 He- 4 He mixed gas separation and purification: Compared with the internal gas filter, the present invention avoids the problem of being placed inside the refrigerator to generate flow resistance to the working medium, and also avoids 3 He gas stored inside the refrigerator causes leakage and contamination. This invention uses liquid helium to purify 3 He, no porous adsorption material is used, avoiding the risk of releasing impurities into the refrigerator after the adsorption material is saturated, avoiding the problem of reactivation of the adsorption material, and the purification process can be continuously cycled for a long time, passing through the cold trap multiple times to completely remove 4 He and impurity gases (including nitrogen, oxygen, hydrogen, water vapor, etc.).

[0077] exist 3 He- 4 He mixed gas recovery: The main part of the recovery is to adjust the power of the circulation pump and the first compressor after the system purification is completed, so that the refrigerator, gas cavity and pipeline 3 He gas enters through the circulation pump 3 He recycled bottles; in addition, 3 After the He gas cylinder is pressurized by the second compressor to charge the refrigerator, 3 He gas is pure and can be directly recycled. The circulating pump and booster compressor used in the system are oil-free and will not introduce other impurities. 3 He gas recovery to 3 After the He is recovered in the bottle, it is convenient for the disassembly, assembly and transportation of the refrigerator. In addition, the present invention is connected with the refrigerator to build a vacuum pipeline for the entire system, which can complete the vacuuming, fixed-proportion mixing and inflation, separation, purification, recycling and storage of the entire system. 3All his work.

[0078] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A filling, separation, purification and recovery system, It is characterized in that include: A first gas filling device and a second gas filling device connected to the refrigeration system are configured to respectively fill the first gas and the second gas into the refrigeration system to form a mixed gas; and a gas purification and recovery device connected to the refrigeration system is configured to separate and store the first gas in the mixed gas.

2. The filling, separation, purification and recovery system according to claim 1, It is characterized in that The gas purification and recovery device comprises a cold trap, a circulation pump, a first compressor and a first recovery bottle which are connected in series through pipelines; the gas outlet of the cold trap is respectively connected to the gas inlet of the circulation pump and the refrigeration system through branch pipelines.

3. The filling, separation, purification and recovery system according to claim 2, It is characterized in that The first gas filling device includes a first gas cylinder and a second compressor connected to the gas outlet of the first gas cylinder through a pipeline; the gas outlet of the second compressor is connected to the gas inlet of the cold trap; the gas outlet of the first gas cylinder is connected to the gas inlet of the cold trap.

4. The filling, separation, purification and recovery system according to claim 2, It is characterized in that The second gas filling device includes a second gas cylinder, an air cavity connected to the gas outlet end of the second gas cylinder through a pipeline, and a first pressure sensor for obtaining the gas pressure in the air cavity. The gas outlet end of the air cavity is connected to the refrigeration system, the gas inlet end of the circulation pump and the gas outlet end of the cold trap through branch pipelines.

5. The filling, separation, purification and recovery system according to claim 1, It is characterized in that The filling separation purification recovery system also includes a vacuum pump for evacuating the filling separation purification recovery system and the refrigeration system.

6. The filling, separation, purification and recovery system according to claim 2, It is characterized in that The filling, separation, purification and recovery system also includes a plurality of valves for controlling the on-off of pipelines.

7. The filling, separation, purification and recovery system according to claim 2, It is characterized in that The filling separation purification recovery system also includes a fifth pressure sensor for obtaining the gas pressure in the first recovery bottle, a second pressure sensor and a fourth pressure sensor for obtaining the pipeline pressure, and a third pressure sensor for obtaining the refrigeration system charging pressure.

8. A filling separation purification recovery method based on the filling separation purification recovery system according to any one of claims 1 to 7, It is characterized in that The method comprises the following steps: Evacuate the charging separation purification recovery system and refrigeration system; Filling the first gas and the second gas into the refrigeration system through the first gas filling device and the second gas filling device to form a mixed gas; Separating, purifying and storing the first gas in the refrigeration system by a gas purification and recovery device; The liquid helium and solid impurities in the filling separation purification recovery system are discharged by heating.

9. The filling, separation, purification and recovery method according to claim 8, It is characterized in that Separating, purifying and storing the first gas in the refrigeration system by a gas purification and recovery device further comprises: the gas purification and recovery device comprises a cold trap, a circulation pump, a first compressor and a first recovery bottle connected in series through a pipeline; Cooling the cold trap to reduce the temperature at the bottom of the cold trap to the temperature of liquid helium; Turn on the circulation pump and the first compressor to circulate the mixed gas along the pipeline, the second gas is liquefied at the cold trap, and other impurities form solid impurities at the cold trap, thereby completing the separation and purification of the first gas; The power of the circulation pump and the first compressor is adjusted so that the separated and purified first gas enters the first recovery bottle through the pipeline via the circulation pump, thereby completing the recovery and storage of the first gas.

10. The filling, separation, purification and recovery method according to claim 9, It is characterized in that The discharge of the liquid helium and solid impurities in the filling separation purification recovery system by heating further includes: heating the cold trap to change the liquid helium and solid impurities in the cold trap into gaseous state and discharge them.

Images