Expander

Details Expander Expander

2005-04-12

2005-04-12

Jiang, Chen Wen (Department: 3744)

Refrigeration

Refrigeration producer

Evaporator, e.g., heat exchanger

C062S498000, C062S087000, C418S268000

Reexamination Certificate

active

06877340

ABSTRACT:
It is an object of the present invention to reduce the constraint that the density ratio is constant as small as possible, and to obtain high power recovering effect in a wide operation range by using an expander which is operated in accordance with a flowing direction of refrigerant. An expander used in a refrigeration cycle uses carbon dioxide as refrigerant and has a compressor, an outdoor heat exchanger and an indoor heat exchanger. The expander comprises a cylindrical cylinder, a rotor which rotates in the cylinder, a vane which divides an expansion space formed between an inner peripheral surface of the cylinder and an outer peripheral surface of the rotor into a plurality of spaces, and a vane groove provided in the rotor for accommodating the vane therein. The vane groove is provided with a back pressure chamber which pushes the vane against the inner peripheral surface of the cylinder, and the refrigerant in the supercritical state is introduced into the back pressure chamber.

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Robinson et al., “Efficiencies of transcritical CO2cycles with and without an expansion turbine”,Int. J. Refrig., vol. 21, No. 7, pp. 577-589, 1998.
Douglas M. Robinson et al. “Efficiencies of transcritical CO2cycles with and without an expansion turbine”; International Journal of Refrigeration, vol. 21, No. 7, Nov. 1998 (pp. 577-589).

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