F - Mech Eng,Light,Heat,Weapons – 25 – B
Patent
F - Mech Eng,Light,Heat,Weapons
25
B
62/143, 137/80
F25B 13/00 (2006.01) F25B 41/06 (2006.01)
Patent
CA 1038178
ABSTRACT OF THE DISCLOSURE An expansion device for use in a reversible vapor compression refrigeration cycle for producing, upon demand, either heating or cooling. Two devices are mounted in opposed relationship in a supply line carrying refrigerant between a first heat exchanger and a second heat exchanger. Each expansion device includes a body having a flow passage therein opening into an expanded chamber. A free-floating piston is slidably mounted in the chamber and ismoved to a first position when refrigerant is passed through the line in a first direction and to a second position when the direction of flow is reversed. A centrally located metering port passes through the piston while fluted channels are formed in its outer periphery. When in the first position, the fluted channels are closed against one side wall of the chamber and refrigerant is throttled through the metering port from the high pre sure exchanger (condenser) into the low pressure ex- changer (evaporator). Reversing the direction of re- frigerant flow causes the piston to be moved into the second position wherein the fluted channels are opened to the supply line to allow an unrestricted flow of refrigerant about the piston.
254842
Duell Richard J.
Ferrel John A.
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