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Superflow helium low-temperature system
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A technology for cryogenic systems and subsystems, used in fluid circulation arrangements, lighting and heating equipment, compressors, etc., to solve problems such as increasing system complexity, damage, and increased maintenance costs
Active Publication Date: 2018-04-27
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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Problems solved by technology
Since the lubricating oil of the negative pressure room temperature pump (pump set) has different viscosity requirements from the lubricating oil used in the room temperature compressor (set), special treatment is required for the lubricating oil, and additional degreasing must be used in large-scale low-temperature refrigeration systems. The device is used to remove the lubricating oil of the negative pressure room temperature pump (pump set) to avoid damage to the low temperature system caused by the formation of particles of oil molecules after cooling down, which will inevitably increase the complexity of the system; at the same time, the pump oil of the negative pressure room temperature pump (pump set) is required Perform regular replacement, increasing maintenance costs
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Embodiment 1
[0039] Please refer to figure 2 , Example 1 is a superfluid helium cryogenic system based on the Claude cycle.
[0040] The superfluid helium cryogenic system includes a room temperature compressor 210, a gas management subsystem 290, a helium liquefaction unit 120, a liquid helium cryogenic pipeline 217, a first storage tank 240, a first cryogenic return gas pipeline 219, a liquid helium transmission pipeline 241, Superfluid helium cryogenic pipeline 251, second storage tank 250, second cryogenic gas return pipeline 253, superfluid helium refrigerator 260, heater 270, oil-free negative pressure room temperature pump unit 280, bypass valve 285, high pressuregas pipeline 211 and low-pressure gas pipeline 215.
[0041] The gas management subsystem 290 includes a first pipeline and a second pipeline connected in parallel with the outlet and inlet of the room temperature compressor 210, the first pipeline is provided with a first valve 212, and the second pipeline is connected ...
Embodiment 2
[0045] Please refer to image 3 , Embodiment 2 is a closed superfluid helium cryogenic system based on the modified Crowder cycle using an oil-free negative pressure room temperature pump unit.
[0046] The superfluid helium cryogenic system includes a room temperature compressor 310, a gas management subsystem 390, a helium liquefaction unit 320, a liquid helium cryogenic pipeline 317, a first storage tank 340, a first cryogenic return gas pipeline 319, a liquid helium transmission pipeline 341, Superfluid helium cryogenic pipeline 351, second storage tank 350, second cryogenic gas return pipeline 353, superfluid helium refrigerator 360, heater 370, oil-free negative pressure room temperature pump unit 380, bypass valve 385, high-pressure gas pipeline 311 and low-pressure gas pipeline 315.
[0047] In Embodiment 2, the structure of the gas management subsystem 390 is the same as that in Embodiment 1, and will not be repeated here.
[0051] Please refer to Figure 4 , Embodiment 3 is a closed superfluid helium cryogenic system using an oil-free negative pressure room temperature pump unit based on a two-stage turbine Collins cycle.
[0052] The cryogenic system includes a room temperature compressor 410, a gas management subsystem 490, a helium liquefaction unit 420, a liquid helium cryogenic pipeline 417, a first storage tank 440, a first cryogenic return gas pipeline 419, a liquid helium transmission pipeline 441, a superfluid helium Cryogenic pipeline 451, second storage tank 450, second low-temperature gas return pipeline 453, superfluid helium refrigerator 460, heater 470, oil-free negative pressure room temperature pump unit 480, bypass valve 485, high-pressure gas pipeline 411 and low-pressure Gas line 415 .
[0053] In Embodiment 3, the structure of the gas management subsystem 490 is the same as that in Embodiment 1, and will not be repeated here.
[0054] The helium liquefaction unit 420 is a C...
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Abstract
The invention discloses a superflow helium low-temperature system. An outlet of a compressor unit communicates with a first inlet of a helium liquefying unit, and a first outlet of the helium liquefying unit communicates with an inlet of a first storage tank. A first outlet of the first storage tank communicates with a second inlet of the helium liquefying unit. A second outlet of the helium liquefying unit communicates with an inlet of the compressor unit. A second outlet of the first storage tank communicates with a first inlet of a superflow helium refrigerator. A first outlet of the superflow helium refrigerator communicates with an inlet of a second storage tank. An outlet of the second storage tank communicates with a second inlet of the superflow helium refrigerator. A second outletof the superflow helium refrigerator communicates with an inlet of a heater. An outlet of the heater communicates with an inlet of an oilless negative-pressure room temperature pump unit, and an outlet of the oilless negative-pressure room temperature pump unit communicates with the inlet of the compressor unit. The oilless negative-pressure room temperature pump unit is adopted in the superflowhelium low-temperature system, running without maintenance can be achieved for a long term, an additional oil removing device is not needed, complexity of the superflow helium system is reduced, and system damage caused by oil particle guiding-in is reduced.
Description
technical field [0001] The invention relates to the technical field of cryogenic refrigeration, in particular to a superfluid helium cryogenic system. Background technique [0002] Because superfluid helium has the advantages of lower temperature, extremely small viscosity and high thermal conductivity, the French National Research Center and the Institute of the Atomic Energy Agency, the Jefferson Laboratory in the United States, the German ElectronSynchrotron DESY, and the Japanese High Energy Accelerator Research Institute KEK , European Nuclear Center CERN, etc. have successively established large-scale cryogenic refrigeration systems in the superfluid helium temperature zone to support the long-term stable operation of superconducting accelerators and superconducting colliders composed of various large superconducting magnets and superconducting radio frequency cavities. [0003] Since the late 1980s, French researchers have used the 300W@1.8K cryogenic system develope...
Claims
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Application Information
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