Sumitomo Heavy Industries, Ltd.

Zhejiang University

Zui Ri

Tatsuo Koizumi

Limin Qiu

Zhihua Gan

Pengda Yan

Xiao Jiang

Kai Fang

In a cryogenic regenerator including a regenerator tube, a partitioning tube, whose tube wall is perforated by uniformly distributed through-holes, inside of which regenerator packing is provided, and having rib rings wrapped peripherally around its outer wall, is arranged coaxially inside the regenerator tube, with a buffer cavity between the regenerator-tube inner wall and the partitioning-tube outer wall. In a pulse-tube refrigerator including the regenerator and a gas reservoir, the regenerator, thanks to the designing of its reservoir and through-holes, draws in radial flows such that the form of heat exchange in the same regenerator cross-section goes from being simple thermal conduction to being heat exchange in which heat convection is coupled with thermal conduction, enhancing radial heat transfer and enabling rapid equilibration of temperature gradients along the regenerator periphery, and, by effectively keeping non-uniformity phenomena inside the regenerator under control, making improved refrigerator efficiency possible.

Cryogenic regenerator and cryogenic refrigerator

A cryogenic refrigerator includes a refrigerator having a cylinder and a displacer movably arranged in the cylinder. The displacer is operative to provide intake of an operating gas into the cylinder and exhaust of the gas out of the cylinder. The refrigerator includes a compressor for compressing the operating gas. The compressor includes a low-pressure side to receive the gas exhausted from the cylinder and a high-pressure side to discharge the gas compressed in the compressor into the cylinder. The refrigerator includes a medium-pressure buffer volume connected to a high-pressure side or a low-pressure side of the compressor. The compressor adjusts a pressure of the buffer volume. The buffer volume is also connected to the cylinder.

Cryogenic refrigerator and cooling method

A cooling system for cooling a superconducting device by a low-temperature fluid is provided. A flow generator for producing a flow in the low-temperature fluid is provided in the cooling system. The low-temperature fluid flowing through the superconducting device is heated. The flow generator is used to produce a flow in the heated low-temperature fluid. The low-temperature fluid is cooled and supplied to the superconducting device.

Cooling system and cooling method

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Tokyo, Japan

Zui Ri