| 主权项 |
1. A tunable pulse tube refrigerator for cryogenic cooling, comprising:
a pulse tube having a cold end and a hot end, for containing a working fluid; a cold heat exchanger for accepting heat from an external heat source, being in fluid communication with the cold end; a hot heat exchanger for rejecting heat from the pulse tube refrigerator, being in fluid communication with the hot end; a pressure wave generator for generating pressure waves in the working fluid; an inertance tube and a fluid reservoir for causing a phase shift between pressure waves and mass flow in the working fluid, with the inertance tube having a proximal end for fluidly communicating with the hot heat exchanger and including an aperture being in a state comprised of either a closed state or an open state, with the open state being for fluidly communicating the inertance tube with the fluid reservoir; the inertance tube being coiled in a spiral around an axis; and a bypass mechanism comprised of a plurality of elongated curved tubes, which are also wound around the axis and are rotatable about the axis, for sliding over different sections of the inertance tube, respectively, when the curved tubes are rotated about the axis relative to the inertance tube, for changing the state of the aperture, whereby the inertance tube has an effective length which can be changed, to thereby change an inertance value which is a function of the effective length. |
