Liquid helium filling and transfer device with cold energy recovery

Abstract

The application provides a liquid helium filling and transfer device with cold energy recovery, and particularly relates to the technical field of cold energy recovery.The liquid helium filling and transfer device with cold energy recovery comprises a liquid inlet unit, a cold energy recovery unit, a helium recovery unit, a switching unit and a storage unit.The liquid inlet unit comprises a liquid helium source.The storage unit comprises a first liquid helium storage tank, a second liquid helium storage tank and a third liquid helium storage tank.The helium recovery unit comprises a helium storage tank, a compression module and a recovery module.The switching unit is used for switching liquid helium or helium.The cold energy recovery unit comprises a heat exchanger group and an ejector.The helium recovery unit and the cold energy recovery unit can recycle cold energy, and the convenience of cold energy recovery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of spectral imaging cold energy recovery, and particularly relates to a liquid helium filling and transfer device with cold energy recovery. BACKGROUND

[0002] Helium is a non-renewable and scarce resource, and is very important in various fields, such as high-purity helium or liquid helium in many fields such as semiconductors and chips, nuclear magnetic resonance equipment in medical treatment, liquid helium can cool the superconducting coil inside the nuclear magnetic resonance equipment, and liquid helium is a key factor to realize the superconducting of the internal coil, and helium is an indispensable key resource for the development of high-tech industries.

[0003] Liquid helium has the characteristics of small latent heat, small density, good thermal conductivity and strong diffusivity. Since the temperature of liquid helium is low, a large amount of energy is consumed to liquefy helium. In the prior art, liquid helium is produced in a helium liquefier or a liquid helium factory, and then filled into a fixed liquid helium container or transferred from a fixed liquid helium container to a liquid helium tank container or a liquid helium Dewar. Therefore, only single filling or transfer operation can be realized, and part of the low-temperature helium gas evaporated during filling or transfer is recharged after being warmed up by a vaporizer. Since the low-temperature helium gas exchanges heat with the outside, the helium gas loses most of the cold energy. SUMMARY

[0004] In order to solve the problem that a large amount of cold energy of helium is lost when low-temperature helium gas generated by evaporation of liquid helium during liquid helium filling or transfer is recharged, the present application provides a liquid helium filling and transfer device with cold energy recovery.

[0005] The present application is realized by the following technical solutions:

[0006] The present application provides a liquid helium filling and transfer device with cold energy recovery, which comprises a liquid inlet unit, a cold energy recovery unit, a helium recovery unit, a switching unit and a storage unit, wherein:

[0007] The liquid inlet unit comprises a liquid helium source and a transmission pipeline;

[0008] The storage unit comprises a first liquid helium storage tank, a second liquid helium storage tank and a third liquid helium storage tank;

[0009] The helium recovery unit comprises a storage module, a compression module and a recovery module;

[0010] The switching unit is used to switch between liquid helium transfer and helium gas;

[0011] The cold energy recovery unit comprises a heat exchanger group and an ejector;

[0012] Liquid helium enters the transmission pipeline and then passes through the switching unit to the first liquid helium storage tank for storage. After the first liquid helium storage tank is filled with liquid helium, the liquid helium passes through the switching unit to the second liquid helium storage tank for storage until the second liquid helium storage tank is filled with liquid helium. During the transfer of liquid helium, the switching unit switches the liquid helium from the first liquid helium storage tank and the second liquid helium storage tank, passing through the switching unit and the cold energy recovery unit in sequence, and then entering the third liquid helium storage tank for storage. The cryogenic helium inside the first liquid helium storage tank and the second liquid helium storage tank passes through the switching unit, the heat exchanger group and the ejector in sequence, and flows into the recovery module, the compression module or the third liquid helium storage tank. The cryogenic helium in the third liquid helium storage tank passes through the heat exchanger group and the ejector in sequence, and finally flows into the recovery module or the compression module.

[0013] Furthermore, the liquid inlet unit also includes an inlet regulating valve, the two ends of which are respectively connected to the switching unit and the liquid helium source.

[0014] Furthermore, the switching unit includes a first filling regulating valve and a second filling regulating valve. The inlet regulating valve is connected to the first filling regulating valve and the second filling regulating valve respectively. One end of the first filling regulating valve and the second filling valve is connected to the first liquid helium storage tank and the second liquid helium storage tank respectively.

[0015] Furthermore, the switching unit also includes a first transfer regulating valve, a second transfer regulating valve, a third transfer regulating valve, and a fourth transfer regulating valve. One end of the first transfer regulating valve is connected to the first liquid helium storage tank, and the other end is connected to the third liquid helium storage tank and the heat exchanger assembly, respectively. The fourth transfer regulating valve is connected to the third liquid helium storage tank. One end of the second transfer regulating valve is connected to the first liquid helium storage tank, and the other end is connected to the third liquid helium storage tank and the heat exchanger assembly, respectively. The fourth transfer regulating valve is connected to the third liquid helium storage tank.

[0016] Furthermore, the switching unit also includes a first recovery valve and a second recovery valve. The first recovery valve is connected at both ends to the heat exchanger group and the first liquid helium storage tank, respectively, and the second recovery valve is connected at both ends to the heat exchanger group and the second liquid helium storage tank, respectively.

[0017] Furthermore, the cold energy recovery unit also includes a third refueling regulating valve, which is located between the first refueling regulating valve, the second refueling regulating valve, the third refueling regulating valve, the fourth refueling regulating valve and the pipeline to the heat exchanger group and the third liquid helium storage tank.

[0018] Furthermore, the cold energy recovery unit also includes a first return gas valve and a first bypass valve. One end of the third liquid helium storage tank is sequentially connected to the first bypass valve, the heat exchanger group, and connected to the pipeline between the first recovery valve, the second recovery valve, and the heat exchanger group.

[0019] Furthermore, the cold energy recovery unit also includes a first inlet valve and a second inlet valve. One end of the first inlet valve and the second inlet valve are connected to the compression module, and the other end is connected to the heat exchanger group and the ejector, respectively.

[0020] Furthermore, the helium recovery unit also includes a first inlet valve and a second return valve. The inlet end of the helium storage tank is connected to the first inlet valve, and the outlet end of the helium storage tank is connected to the second return valve. The helium recovery unit also includes a second bypass valve, with its two ends connected to the first inlet valve and the second return valve, respectively.

[0021] Furthermore, it also includes a purification unit, which includes a nitrogen replacement module, a helium replacement module, a vacuum pump group, and a purifier. The nitrogen replacement module is used to replace the cold energy in the device with nitrogen, the helium replacement module is used to replace the cold energy in the device with helium, the vacuum pump group is used to deliver helium and nitrogen, and the purifier is used to filter impurities.

[0022] The beneficial effects of this invention are:

[0023] (1) The liquid helium filling and transfer device with cold energy recovery proposed in this invention can transfer liquid helium to multiple other containers when filling liquid helium. Secondly, when transferring or filling liquid helium, liquid helium is converted into helium gas. The cold energy generated by the helium gas and the remaining cold energy of the helium gas can be recovered by the cold energy recovery unit. Furthermore, helium gas can also be recovered by the helium gas recovery unit, thereby making full use of cold energy and improving the convenience of cold energy recovery.

[0024] (2) The liquid helium filling and transfer device with cold energy recovery proposed in this invention can replace other gases in the entire device except for helium through the purification unit. Furthermore, this invention can also achieve intelligent control of the device through the control module by coordinating control hardware and control software. Attached Figure Description

[0025] Figure 1 This is a structural diagram of the liquid helium refueling and transfer device with cold energy recovery according to the present invention;

[0026] In the diagram: Liquid inlet unit 1, liquid helium source 11, inlet regulating valve 12, helium outlet 13, switching unit 2, first filling regulating valve 21, second filling regulating valve 22, first transfer regulating valve 23, second transfer regulating valve 24, third transfer regulating valve 25, fourth transfer regulating valve 26, first recovery valve 27, second recovery valve 28, third recovery valve 29, fourth recovery valve 210, cold energy recovery unit 3, heat exchanger assembly 31, ejector 32, third filling regulating valve 33, first inlet valve 34, first bypass valve 35, first return valve 36, etc. Gas valve 36, second inlet valve 37, helium recovery unit 4, storage module 41, helium storage tank 411, first inlet valve 412, second bypass valve 413, second return valve 414, recovery module 42, compression module 43, control unit 5, control hardware 51, control hardware 52, purification unit 6, vacuum pump group 61, purifier 62, helium replacement module 63, nitrogen replacement module 64, storage unit 7, first liquid helium storage tank 71, second liquid helium storage tank 72, third liquid helium storage tank 73, measuring device 8, safety accessory 9;

[0027] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] To more clearly and completely illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings.

[0029] Please refer to Figure 1 This invention proposes a liquid helium filling and transfer device with cold energy recovery, comprising a liquid inlet unit 1, a cold energy recovery unit 3, a helium recovery unit 4, a switching unit 2, and a storage unit 7, wherein:

[0030] Liquid inlet unit 1 includes a liquid helium source 11 and a transmission pipeline;

[0031] Storage unit 7 includes a first liquid helium storage tank 71, a second liquid helium storage tank 72, and a third liquid helium storage tank 73;

[0032] The helium recovery unit 4 includes a storage module 41, a compression module 43 and a recovery module 42. The storage module 41 includes a helium storage tank 411.

[0033] Switching unit 2 is used to switch between liquid helium or gas helium.

[0034] The cold energy recovery unit 3 includes a heat exchanger assembly 31 and an ejector 32;

[0035] Liquid helium enters the transmission pipeline and then passes through switching unit 2 to the first liquid helium storage tank 71 for storage. After the first liquid helium storage tank 71 is filled with liquid helium, the liquid helium passes through switching unit 2 to the second liquid helium storage tank 72 for storage until the second liquid helium storage tank 72 is filled with liquid helium. During the transfer of liquid helium, switching unit 2 switches the liquid helium from the first liquid helium storage tank 71 and the second liquid helium storage tank 72, passing through switching unit 2 and cold energy recovery unit 3 in sequence, and then entering the third liquid helium storage tank 73 for storage. The cryogenic helium inside the first liquid helium storage tank 71 and the second liquid helium storage tank 72 passes through switching unit 2, heat exchanger group 31 and ejector 32 in sequence, and flows into recovery module 42, compression module 43 or the third liquid helium storage tank 73. The cryogenic helium in the third liquid helium storage tank 73 passes through heat exchanger group 31 and ejector 32 in sequence, and finally flows into recovery module 42 or compression module 43.

[0036] In this embodiment:

[0037] Liquid inlet unit 1 is used to supply liquid helium;

[0038] Switching unit 2 is used to switch between transferring and injecting liquid helium;

[0039] Cold energy recovery unit 3 is used for helium heat exchange;

[0040] Helium recovery unit 4 is used to recover helium;

[0041] Storage unit 7 is used to store liquid helium;

[0042] Storage module 41 includes a helium storage tank 411 for storing helium;

[0043] Specifically, an inlet regulating valve 12 is connected to the outlet of the nitrogen source. The outlet of the inlet regulating valve 12 is connected to two liquid helium tank lines. The two liquid helium lines are respectively connected to the inlets of the first liquid helium storage tank 71 and the second liquid helium storage tank 72 and extend into them. The first liquid helium storage tank 71 and the second liquid helium storage tank 72 are each provided with two outlets. The pipelines on one outlet of the first liquid helium storage tank 71 and the second liquid helium storage tank 72 are respectively connected to a first transfer regulating valve 23 and a second transfer regulating valve 24. A third transfer regulating valve 25 and a fourth transfer regulating valve 26 are respectively connected in parallel to the first transfer regulating valve 23 and the second transfer regulating valve 24. The two pipelines finally converge and connect to the second transfer regulating valve. At the inlet of the three liquid helium storage tanks 73, a third filling regulating valve 33 is connected to the converging pipeline. A branch pipeline from the outlet of the third filling regulating valve 33 connects to one inlet of the heat exchanger assembly 31. Pipelines at the other outlets of the first liquid helium storage tank 71 and the second liquid helium storage tank 72 are respectively connected to a first recovery valve 27 and a second recovery valve 28. These two pipelines converge and connect to the second inlet of the heat exchanger assembly 31. The third liquid helium storage tank 73 has one outlet, which is connected to the third inlet of the heat exchanger assembly 31 via a pipeline. A first bypass valve 35 is connected to the pipeline at the first outlet of the heat exchanger assembly 31 and leads to the second inlet of the heat exchanger assembly 31. The inlet pipes form a bypass loop. The other outlet of the heat exchanger assembly 31 is connected to one inlet of the ejector 32. The interface on one side of the compression module 43 is connected to the fourth inlet of the heat exchanger assembly 31 via the first inlet valve 34. The other inlet of the ejector 32 is connected to the pipe connecting the heat exchanger assembly 31 to the compression module 43. A second inlet valve 37 is provided on the pipe connecting the heat exchanger assembly 31 to the compression module 43. The outlet of the ejector 32 is connected to a pipe with three branch pipes. The first branch pipe is connected to the first inlet valve 412 and is connected to the inlet of the helium storage tank 411. The second branch... The pipeline is sequentially connected to a second bypass valve 413 and a second return valve 414, and is connected to the outlet of the helium storage tank 411. A third branch pipeline is connected to the recovery module 42. Finally, another interface of the compression module 43 is connected to the pipeline between the second bypass valve 413 and the second return valve 414. The liquid helium filling and transfer device with cold energy recovery proposed in this invention can transfer liquid helium to multiple other containers when filling liquid helium. Secondly, when transferring or filling liquid helium, liquid helium is converted into helium gas. The cold energy generated by the helium gas and the remaining cold energy of the helium gas can be recovered through the cold energy recovery unit 3 to realize the full utilization of cold energy and improve the convenience of cold energy recovery.

[0044] In one embodiment, the liquid inlet unit 1 further includes a helium outlet 13, and the switching unit 2 further includes a third recovery valve 29 and a fourth recovery valve 210. The two helium pipelines on the first liquid helium storage tank 71 and the second liquid helium storage tank 72 also have two branch pipes that are respectively connected to the third recovery valve 29 and the fourth recovery valve 210. Opening the third recovery valve 29 and the fourth recovery valve 210 or opening the first recovery valve 27 and the second recovery valve 28 can allow helium to be discharged from the helium outlet 13 or transported to the heat exchanger group 31.

[0045] In one embodiment, the device further includes a control unit 5, which includes control hardware 5251 and control software. The control hardware 5251 and the control software work together to achieve intelligent regulation of the device.

[0046] In one embodiment, the first liquid helium storage tank 71, the second liquid helium storage tank 72, and the third liquid helium storage tank 73 are all equipped with a measuring device 8 and a safety accessory 9. The first liquid helium storage tank 71, the second liquid helium storage tank 72, and the third liquid helium storage tank 73 can be vertical liquid helium containers or horizontal liquid helium storage tanks.

[0047] Furthermore, the liquid inlet unit 1 also includes an inlet regulating valve 12, the two ends of which are respectively connected to the switching unit and the liquid helium source 11.

[0048] In this embodiment:

[0049] The inlet regulating valve 12 is used to regulate the flow rate of liquid helium;

[0050] Specifically, the liquid inlet unit 1 also includes an inlet regulating valve 12. Helium enters the switching unit 2 through the inlet regulating valve. The inlet regulating valve 12 regulates the flow rate of liquid helium and simultaneously opens and closes the liquid helium source 11.

[0051] Furthermore, the switching unit 2 includes a first filling regulating valve 21 and a second filling regulating valve 22. The inlet regulating valve 12 is connected to the first filling regulating valve 21 and the second filling regulating valve 22 respectively. One end of the first filling regulating valve 21 and the second filling regulating valve 22 is connected to the first liquid helium storage tank 71 and the second liquid helium storage tank 72 respectively.

[0052] In this embodiment:

[0053] The first filling regulating valve 21 and the second filling regulating valve 22 are used to control the flow of liquid helium into the first liquid helium storage tank 71 and the second liquid helium storage tank 72;

[0054] Specifically, the switching unit 2 includes a first filling regulating valve 21 and a second filling regulating valve 22. Liquid helium in the transmission pipeline enters the first liquid helium storage tank 71 and the second liquid helium storage tank 72 through the first filling regulating valve 21 and the second filling regulating valve 22, respectively. The first filling regulating valve 21 and the second filling regulating valve 22 are opened and closed to cut off the pipeline between the liquid helium source 11 and the first liquid helium storage tank 71 and the second liquid helium storage tank 72, so as to stop or fill liquid helium.

[0055] Furthermore, the switching unit 2 also includes a first transfer regulating valve 23, a second transfer regulating valve 24, a third transfer regulating valve 25, and a fourth transfer regulating valve 26. One end of the first transfer regulating valve 23 is connected to the first liquid helium storage tank 71, and the other end is connected to the third liquid helium storage tank 73 and the heat exchanger assembly 31, respectively. The fourth transfer regulating valve 26 is connected to the third liquid helium storage tank 73. One end of the second transfer regulating valve 24 is connected to the first liquid helium storage tank 71, and the other end is connected to the third liquid helium storage tank 73 and the heat exchanger assembly 31, respectively. The fourth transfer regulating valve 26 is connected to the third liquid helium storage tank 73.

[0056] In this embodiment:

[0057] The first transfer regulating valve 23, the second transfer regulating valve 24, the third transfer regulating valve 25 and the fourth transfer regulating valve 26 are used to control the flow of liquid helium from the first liquid helium storage tank 71 and the second liquid helium storage tank 72 into the third liquid helium storage tank 73.

[0058] Specifically, the switching unit 2 also includes a first transfer regulating valve 23, a second transfer regulating valve 24, a third transfer regulating valve 25, and a fourth transfer regulating valve 26. Liquid helium in the first liquid helium storage tank 71 enters the third liquid helium storage tank 73 for storage through the first transfer regulating valve 23 or the third transfer regulating valve 25. Liquid helium in the second liquid helium storage tank 72 enters the third liquid helium storage tank 73 for storage through the second transfer regulating valve 24 or the fourth transfer regulating valve 26. The first transfer regulating valve 23 and the third transfer regulating valve 25 are connected in parallel, and the second transfer regulating valve 24 and the fourth transfer regulating valve 26 are connected in parallel. When the first transfer regulating valve 23 and the third transfer regulating valve 25 fail, the second transfer regulating valve 24 and the fourth transfer regulating valve 26 serve as backup valves.

[0059] Furthermore, the switching unit 2 also includes a first recovery valve 27 and a second recovery valve 28. The two ends of the first recovery valve 27 are respectively connected to the heat exchanger group 31 and the first liquid helium storage tank 71, and the two ends of the second recovery valve are respectively connected to the heat exchanger group 31 and the second liquid helium storage tank 72.

[0060] In this embodiment:

[0061] The first recovery valve 27 and the second recovery valve 28 are used to control the flow of helium gas from the first liquid helium storage tank 71 and the second liquid helium storage tank 72 into the heat exchanger group 31.

[0062] Specifically, the switching unit 2 also includes a first recovery valve 27 and a second recovery valve 28. Helium gas in the first liquid helium storage tank 71 and the second liquid helium storage tank 72 enters the heat exchanger group 31 through the first recovery valve 27 and the second recovery valve 28, respectively. As the liquid helium absorbs external heat, the gas in the first liquid helium storage tank 71 and the second liquid helium storage tank 72 will be converted into gas, and the pressure will increase. The gas flows into the heat exchanger group 31 through the first recovery valve 27 and the second recovery valve 28 for heat exchange, thereby completing the cold energy recovery.

[0063] Furthermore, the cold energy recovery unit 3 also includes a third refueling regulating valve 33, which is located between the first refueling regulating valve 23, the second refueling regulating valve 24, the third refueling regulating valve 25, the fourth refueling regulating valve 26 and the pipelines to the heat exchanger group 31 and the third liquid helium storage tank 73.

[0064] In this embodiment:

[0065] The third filling regulating valve 33 is used to control the flow rate of liquid helium and helium gas;

[0066] Specifically, the cold energy recovery unit 3 also includes a third filling regulating valve 33. When transferring liquid helium, the liquid helium in the first liquid helium storage tank 71 and the second liquid helium storage tank 72 enters the heat exchanger group 31 through the third filling regulating valve 33. The outlet end of the third filling regulating valve 33 is connected to the heat exchanger group 31 and the third liquid helium storage tank 73 respectively. The liquid enters the liquid helium tank for storage, while the gas enters the heat exchanger group 31 for low-temperature rewarming, so as to recover helium.

[0067] Furthermore, the cold energy recovery unit 3 also includes a first return gas valve 36 and a first bypass valve 35. One end of the third liquid helium storage tank 73 is connected in sequence to the first bypass valve 35, the heat exchanger group 31, and connected to the pipeline between the first recovery valve 27, the second recovery valve 28 and the heat exchanger group 31.

[0068] In this embodiment:

[0069] The return valve is used to control the delivery of helium gas from the third liquid helium storage tank 73 to the heat exchanger assembly 31.

[0070] The first bypass valve 35 is used to control the return of helium gas after heat exchange to the heat exchanger assembly 31.

[0071] Specifically, the cold energy recovery unit 3 also includes a first return valve 36 and a first bypass valve 35. The low-temperature gas in the third liquid helium storage tank 73 enters the heat exchanger group 31 through the first bypass valve 35, and then enters the third liquid helium storage tank 73 again through the first return valve 36. The two ends of the return valve are connected to the heat exchanger group 31 and the third liquid helium storage tank 73 respectively. Opening the third liquid helium storage tank 73 can transport the helium gas evaporated inside to the heat exchanger group 31 for heat exchange and recover the cold energy of the helium gas. One end of the first bypass valve 35 is connected to the outlet of the heat exchanger, and the other end is connected to an inlet of the heat exchanger group 31, so that the helium gas is reheated at low temperature for easy recovery.

[0072] Furthermore, the cold energy recovery unit 3 also includes a first inlet valve 34 and a second inlet valve 37. One end of the first inlet valve 34 and the second inlet valve 37 are connected to the compression module 43, and the other end is connected to the heat exchanger group 31 and the ejector 32, respectively.

[0073] In this embodiment:

[0074] The first inlet valve 34 and the second inlet valve 37 are used to control the helium gas from the compression module 43 to enter the heat exchanger group 31 and the ejector 32, respectively.

[0075] Specifically, the cold energy recovery unit 3 also includes a first inlet valve 34 and a second inlet valve 37. After being compressed, the helium gas in the compression module 43 enters the heat exchanger group 31 and the ejector 32 through the first inlet valve 34 and the second inlet valve 37 respectively. After being compressed by the compression module 43, the helium gas is transported to the recovery module 42 through the ejector 32, or it is heat exchanged through the heat exchanger group 31 to complete the low temperature rewarming, so that the recovery module 42 can recover it.

[0076] Furthermore, the helium recovery unit 4 also includes a first inlet valve 412 and a second return valve 414. The inlet end of the helium storage tank 411 is connected to the first inlet valve 412, and the outlet end of the helium storage tank 411 is connected to the second return valve 414. The helium recovery unit 4 also includes a second bypass valve 413, with its two ends connected to the first inlet valve 412 and the second return valve 414, respectively.

[0077] In this embodiment:

[0078] The first inlet valve 412 and the second return valve 414 are used to control the entry and exit of helium into and out of the helium storage tank 411.

[0079] The first inlet valve 412 is used to control the connection between the inlet and outlet of the helium storage tank 411;

[0080] Specifically, the helium recovery unit 4 also includes a first inlet valve 412 and a second return valve 414. The helium in the ejector 32 enters the helium storage tank 411 through the first inlet valve 412 and is then transported to the compression module 43 through the second return valve 414. The helium recovery unit 4 also includes a second bypass valve 413. The helium in the helium storage tank 411 flows back to the helium storage tank 411 through the second return valve 414, the second bypass valve 413, and the first inlet valve 412 in sequence. The first inlet valve 412 and the second return valve 414 can control the opening and closing of the inlet and outlet of the helium storage tank 411, respectively. The bypass valve is used to connect the inlet and outlet of the storage tank to maintain pressure balance. The first inlet valve 412 and the second return valve 414 are opened and closed to store helium or to flow helium back to the compression module 43.

[0081] Furthermore, it also includes a purification unit 6, which includes a nitrogen replacement module 64, a helium replacement module 63, a vacuum pump group 61, and a purifier 62. The nitrogen replacement module 64 is used to replace the cold energy in the device with nitrogen, the helium replacement module 63 is used to replace the cold energy in the device with helium, the vacuum pump group 61 is used to transport helium and nitrogen, and the purifier 62 is used to filter impurities.

[0082] Specifically, the nitrogen replacement module 64, the helium replacement module 63, the vacuum pump group 61, and the purifier 62 are connected to a pipeline, which branches into two pipelines. One pipeline is connected between the regulating valve and the second filling valve, and the other pipeline is equipped with a shut-off valve and connected between the compression module 43 and the first inlet valve 34. The purification unit 6 is used to replace other gases inside the device except for helium.

[0083] In summary, during actual use, first open all valves inside the system to replace the internal gas through purification unit 6. Once the internal gas reaches the required level and the system purification mode is complete, adjust the flow rate of liquid helium using the regulating valve. Then, open the first filling regulating valve 21 in switching unit 2 to fill the first liquid helium storage tank 71 with liquid helium. After filling, open the second filling valve in switching unit 2 to fill the second liquid helium storage tank 72 with liquid helium. During liquid helium transfer, open one of the first transfer valve, the third transfer valve, and one of the second transfer valve, the fourth transfer regulating valve 26, to transfer the liquid helium from the first liquid helium storage tank 71. The liquid helium is transferred from the second liquid helium storage tank 72 to the third liquid helium storage tank 73. During the storage of liquid helium in the first liquid helium storage tank 71 and the second liquid helium storage tank 72, the first recovery valve 27 and the second recovery valve 28 can be opened to export helium to the cold energy recovery unit 3. The helium is then reheated through the heat exchanger group 31, and the helium input into the cold energy recovery unit 3 from the compression module 43 is cooled. Finally, the helium flows back to the recovery module 42 or the compression module 43 through the ejector 32. This invention can realize the transfer and filling of liquid helium, and at the same time, the cryogenic helium or liquid helium can be injected into the liquid helium tank to be cooled without pressurization.

[0084] Of course, the present invention may have many other embodiments. Based on this embodiment, other embodiments obtained by those skilled in the art without any creative effort are all within the scope of protection of the present invention.

Claims

1. A liquid helium refueling and transfer device with cold energy recovery, characterized in that, It includes a liquid inlet unit, a cold energy recovery unit, a helium recovery unit, a switching unit, and a storage unit, wherein: The liquid inlet unit includes a liquid helium source and a transmission pipeline; The storage unit includes a first liquid helium storage tank, a second liquid helium storage tank, and a third liquid helium storage tank; The helium recovery unit includes a storage module, a compression module, and a recovery module, and the storage module includes a helium storage tank. The switching unit is used to switch between liquid helium or gas helium. The cold energy recovery unit includes a heat exchanger assembly and an ejector. Liquid helium enters the transmission pipeline and then passes through the switching unit to the first liquid helium storage tank for storage. After the first liquid helium storage tank is filled with liquid helium, the liquid helium passes through the switching unit to the second liquid helium storage tank for storage until the second liquid helium storage tank is filled with liquid helium. During the transfer of liquid helium, the switching unit switches the liquid helium from the first liquid helium storage tank and the second liquid helium storage tank, passing through the switching unit and the cold energy recovery unit in sequence, and then entering the third liquid helium storage tank for storage. The cryogenic helium inside the first liquid helium storage tank and the second liquid helium storage tank passes through the switching unit, the heat exchanger group and the ejector in sequence, and flows into the recovery module, the compression module or the third liquid helium storage tank. The cryogenic helium in the third liquid helium storage tank passes through the heat exchanger group and the ejector in sequence, and finally flows into the recovery module or the compression module.

2. The liquid helium refueling and transfer device with cold energy recovery according to claim 1, characterized in that, The liquid inlet unit also includes an inlet regulating valve, the two ends of which are connected to the switching unit and the liquid helium source, respectively.

3. The liquid helium refueling and transfer device with cold energy recovery according to claim 2, characterized in that, The switching unit includes a first filling regulating valve and a second filling regulating valve. The inlet regulating valve is connected to the first filling regulating valve and the second filling regulating valve respectively. One end of the first filling regulating valve and the second filling regulating valve is connected to the first liquid helium storage tank and the second liquid helium storage tank respectively.

4. The liquid helium refueling and transfer device with cold energy recovery according to claim 3, characterized in that, The switching unit further includes a first transfer regulating valve, a second transfer regulating valve, a third transfer regulating valve, and a fourth transfer regulating valve. One end of the first transfer regulating valve is connected to the first liquid helium storage tank, and the other end is connected to the third liquid helium storage tank and the heat exchanger assembly, respectively. The fourth transfer regulating valve is connected to the third liquid helium storage tank. One end of the second transfer regulating valve is connected to the first liquid helium storage tank, and the other end is connected to the third liquid helium storage tank and the heat exchanger assembly, respectively. The fourth transfer regulating valve is connected to the third liquid helium storage tank.

5. The liquid helium refueling and transfer device with cold energy recovery according to claim 4, characterized in that, The switching unit further includes a first recovery valve and a second recovery valve. The first recovery valve is connected at both ends to the heat exchanger group and the first liquid helium storage tank, respectively. The second recovery valve is connected at both ends to the heat exchanger group and the second liquid helium storage tank, respectively.

6. The liquid helium refueling and transfer device with cold energy recovery according to claim 5, characterized in that, The cold energy recovery unit also includes a third refueling regulating valve, which is located between the first refueling regulating valve, the second refueling regulating valve, the third refueling regulating valve, the fourth refueling regulating valve and the pipeline to the heat exchanger group and the third liquid helium storage tank.

7. The liquid helium refueling and transfer device with cold energy recovery according to claim 6, characterized in that, The cold energy recovery unit also includes a first return gas valve and a first bypass valve. One end of the third liquid helium storage tank is connected in sequence to the first bypass valve and the heat exchanger group, and is connected to the pipeline between the first recovery valve, the second recovery valve and the heat exchanger group.

8. The liquid helium refueling and transfer device with cold energy recovery according to claim 1, characterized in that, The cold energy recovery unit also includes a first inlet valve and a second inlet valve. One end of the first inlet valve and the second inlet valve are connected to the compression module, and the other end is connected to the heat exchanger group and the ejector, respectively.

9. The liquid helium refueling and transfer device with cold energy recovery according to claim 1, characterized in that, The helium recovery unit further includes a first inlet valve and a second return valve. The inlet end of the helium storage tank is connected to the first inlet valve, and the outlet end of the helium storage tank is connected to the second return valve. The helium recovery unit also includes a second bypass valve, with its two ends connected to the first inlet valve and the second return valve, respectively.

10. The liquid helium refueling and transfer device with cold energy recovery according to claim 9, characterized in that, It also includes a purification unit, which includes a nitrogen replacement module, a helium replacement module, a vacuum pump group, and a purifier. The nitrogen replacement module is used to replace the cold energy in the device with nitrogen, the helium replacement module is used to replace the cold energy in the device with helium, the vacuum pump group is used to deliver helium and nitrogen, and the purifier is used to filter impurities.

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