Zhejiang University

Sumitomo Heavy Industries, Ltd.

Limin Qiu

Xiao Jiang

Zhihua Gan

Bo Wang

Zui Ri

Kai Fang

Longyi Wang

Bingyan Fan

A refrigerator includes a regenerator, a low-temperature end heat exchanger, a pulse tube, a high-temperature end heat exchanger, and a phase adjustment mechanism, connected in that order. A draft tube is provided inside the regenerator, paralleling the regenerator's axis, and the draft tube can extend into the low-temperature end heat exchanger.

Pulse-tube refrigerator

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 pulse tube cryocooler modulating phase via an inertance tube and an acoustic amplifier (A, A) provided in the pulse tube cryocooler are disclosed. The acoustic power amplifier (A, A) is made of a metal pulse tube (PT, PT) filled with regenerative materials, which are located at a distance of X from the hot end of the pulse tube. The length of the regenerative materials is L which meets the requirement of X&#x2212;L&#x3e;0. The acoustic power amplifier (A, A) can be used not only in a single-stage pulse tube cryocooler, but also in a multi-stage pulse tube cryocooler thermally coupled or gas coupled. The regenerative materials may be any cold storage materials applicable at low temperatures, such as stainless steel wire mesh, lead pellet, lead thread et al. The acoustic power amplifier (A, A) can increase the acoustic power at the hot end of the pulse tube (PT, PT), which is advantageous to the phase modulation of the inertance tube, thereby the properties of the pulse tube cryocooler can be enhanced.

Pulse tube cryocooler modulating phase via inertance tube and acoustic power amplifier thereof

Growing community of inventors

Hangzhou, China

Limin Qiu