Refrigerant expansion device for optimizing cooling and defrost

Details Refrigerant expansion device for optimizing cooling and defrost Refrigerant expansion device for optimizing cooling and defrost

1990-06-27

1991-06-25

Bennett, Henry A.

Refrigeration

Reversible, i.e., heat pump

With flow control or compressor details

623241, 62222, 62528, 1374938, F25B 1300

Patent

active

050256408

ABSTRACT:
A refrigerant expansion device for use in a refrigeration system includes a body having a flow passage extending therethrough. A piston having a flow metering port therethrough is moveably mounted within the flow passage. A flow metering rod is supported within the housing and extends through the flow metering port. The flow metering rod and the flow metering port cooperate to define a flow metering passage between them. The flow metering rod is configured so that the cross sectional area of the metering passage varies relative to the axial position of the piston with respect to the rod. The piston is spring biased and the piston moves relative to the rod as a function of the pressure differential across the piston. The cross sectional area of the flow metering rod is configured to define a defrost metering zone which cooperates with the metering port to provide a defrost flow metering passage, at pressure differentials lower than the normal pressure differential for cooling operation of a system in which the device is to be installed. The defrost metering passage is substantially larger than the flow metering passage required for normal cooling operation of the refrigeration system.

REFERENCES:
patent: 3404542 (1968-10-01), Fineblum
patent: 4341090 (1982-09-01), Ramakrishnan

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