Pushing piston and low-temperature refrigerator adopting same
A low-temperature refrigerator and piston technology, which is used in refrigerators, refrigeration and liquefaction, compressors, etc., can solve the problems of limited heat exchange area and difficult refrigerant gas cooling, so as to reduce the loss of cooling capacity and prevent the decline of cooling capacity. , the effect of improving performance
Pending Publication Date: 2019-10-22
CSIC PRIDE (NANJING) CRYOGENIC TECHNOLOGY CO LTD
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Problems solved by technology
However, for small cryogenic refrigerators, the size of the spiral groove on the piston is limited by the overall structure, and the heat exchange area between the refrigerant gas and the piston is limited, so it is difficult to fully cool the refrigerant gas leaking from the hot end of the piston to the cold end. Gas temperature in the expansion chamber
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[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0024] Such as Figure 1-5 Shown: a push piston, the push piston is cylindrical and has a cold storage material inside, the push piston is placed in the cylinder 13 and can reciprocate along the extension direction of the cylinder 13, thus in the cylinder 13 The compressed working fluid is expanded to generate cold; a concave spiral groove gas passage 4 is provided on the outer surface of the push piston, and a spiral groove gas passage 4 protruding from the spiral groove gas passage 4 is provided on the concave wall of the spiral groove gas passage 4 The protruding structures 5 on the surface of the concave wall are arranged continuously or discretely along the extending direction of the spiral groove gas passage 4 . The size of the envelope outer diameter 5c formed by the outer edge of the above-mentioned protruding structure 5 is smaller than the si...
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The invention discloses a pushing piston and a low-temperature refrigerator adopting the same, and belongs to the technical field of low-temperature refrigerators. The pushing piston is arranged in acylinder (13) and capable of reciprocating along the extending direction of the cylinder (13); a concave spiral groove gas passage (4) is arranged on the outer surface of the pushing piston; a convexstructure (5) protruding out of the surface of the concave wall of the spiral groove gas passage (4) is arranged on the concave wall of the spiral groove gas passage (4); the convex structure (5) isarranged continuously or discretely along the extending direction of the spiral groove gas passage (4); and the refrigerator comprises the push piston which is arranged in the cylinder (13) of the refrigerator. According to the pushing piston, heat exchange between refrigerant gas and the pushing piston can be fully carried out within the limited size range of the spiral groove gas passage, cold loss is reduced, and the performance of the refrigerator is improved.
Description
technical field [0001] The invention relates to the technical field of low-temperature refrigerators, in particular to a sliding piston capable of improving the performance of the refrigerator and reducing the loss of cooling capacity caused by gas leakage between the piston and the cylinder, and a low-temperature refrigerator using the sliding piston. Background technique [0002] Cold storage refrigerators include, for example, GM refrigerators and Stirling refrigerators. These refrigerators have a cylinder and a pusher piston that reciprocates inside it. If the seal between the cylinder and the piston is insufficient, the refrigerant gas may not be able to exhibit a desired cooling capacity. In order to prevent this problem, since the refrigerant gas flowing along the spiral groove passes through a longer path than when flowing parallel to the cylinder axis, sufficient heat exchange can be performed with the piston. Therefore, heat loss due to the refrigerant gas flowin...
Claims
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IPC IPC(8): F25B9/14
CPCF25B9/14
Inventor 李奥董文庆钱继峰李艳锋
Owner CSIC PRIDE (NANJING) CRYOGENIC TECHNOLOGY CO LTD