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Cold Compression Pulse Tube Refrigerator and Precooled Refrigerator System
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A pulse tube refrigerator, compression technology, applied in refrigerators, compressors, compressors, etc., can solve the problems of large flow resistance and difficult realization of regenerators, and achieve the goal of improving work efficiency and improving the efficiency of regenerators. Effect
Active Publication Date: 2020-07-28
TONGJI UNIV
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Problems solved by technology
However, the flow resistance of the regenerator at low pressure is very large, which is more difficult to achieve than high charging pressure
Method used
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Embodiment 1
[0054] like figure 1 Shown is a cold compression pulse tube refrigerator. The pulse tube refrigerator includes a compressor work transfer pipe and a cold head, the compressor is connected to the cold head through the work transfer pipe, and the work transfer pipe transfers the compression work of the compressor to the cold head to realize low-temperature compression.
[0055] Described compressor comprises motor 111, compression piston 112, compression chamber 113, and compression chamber 113 is connected with work transfer pipe 132 by connecting pipe 12; Tube cold end gas homogenizer 133;
[0056] The cold head includes a radiator 211, a first regenerator 212, a precooling heat exchanger 213, a second regenerator 214, a cooling heat exchanger 215, a pulse tube 232, and a phase modulator 240 connected in sequence . The top of the pulse tube 232 is provided with a gas homogenizer 233 at the hot end of the pulse tube, and the gas homogenizer 231 at the cold end of the pulse t...
Embodiment 2
[0064] like figure 2 Shown is a cold compression pulse tube refrigerator. On the basis of Embodiment 1, the pulse tube refrigerator cancels the compressor connecting pipe 12, so that the original compressor's compression chamber 113 and the work transmission pipe 132 are connected in space, and the upper end of the compression piston 112 is at room temperature. A temperature gradient from room temperature to low temperature. The heat sink 211 is maintained at a low temperature, such as 77K. All the other structures are the same as in Example 1.
Embodiment 3
[0066] like image 3 Shown is a cold compression pulse tube refrigerator. This pulse tube refrigerator is an improvement on the basis of Embodiment 2. For the convenience of adjustment, the hot end of the pulse tube 232 is placed at the room temperature end, so the bypass 24, the No. 1 bypass valve 241, the No. 2 bypass valve 242, the gas reservoir 236, the connecting pipe 235 and the valve 234 are moved to the room temperature environment .
[0067] The thermal bridge 201 is used to connect the heat sink 211 and the middle part of the vessel 232 together, so that the temperature of the middle part of the vessel 232 decreases, thereby reducing the axial heat transfer to the cold head.
[0068] All the other structures are identical with embodiment 2.
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Abstract
The invention relates to a cold compression type pulse tube refrigerator and a pre-refrigerating type refrigerator system. The cold compression type pulse tube refrigerator comprises a compressor, a refrigerating head and a work transmission tube; the compressor is connected with the refrigerating head through the work transmission tube, and the work transmission tube transmits compression work of the compressor to the refrigerating head, so that low-temperature compression is achieved. The pre-refrigerating type refrigerator system adopting the cold compression type pulse tube refrigerator comprises the cold compression type pulse tube refrigerator and a pre-refrigerating system, and the pre-refrigerating system is connected with the cold compression type pulse tube refrigerator to supply pre-refrigerating refrigerating capacity to the refrigerating head of the cold compression type pulse tube refrigerator. Compared with the prior art, the pulse tube refrigerator can adopt the inflating pressure lower than the critical pressure, therefore, the theoretical efficiency of a heat regenerator is improved, and the refrigerator can achieve high efficiency at the liquid helium temperature or the lower temperature.
Description
technical field [0001] The invention relates to the technical field of pulse tube refrigerators, in particular to a pulse tube refrigerator using a cold compressor. Background technique [0002] The cryogenic refrigerator in the liquid helium temperature zone plays an extremely important role in the fields of low-temperature superconductivity, low temperature physics and medical treatment. Therefore, the cryogenic refrigeration technology in the liquid helium temperature zone has important research significance. [0003] Pulse tube refrigerators do not have any moving parts at low temperatures, and have significant advantages such as simple structure, small mechanical vibration, long life, and high reliability. However, at present, the technology of pulse tube refrigerators in the liquid helium temperature zone is still immature. The chiller system is complex and inefficient. [0004] The 4K pulse tube refrigerator is a refrigerator that can work in the liquid helium temper...
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