Dual flow variable area expansion device for heat pump system

Details Dual flow variable area expansion device for heat pump system Dual flow variable area expansion device for heat pump system

1990-07-26

1991-07-09

Bennett, Henry A.

Refrigeration

Reversible, i.e., heat pump

With flow control or compressor details

623241, 62222, 62528, 1374938, F25B 1300

Patent

active

050294547

ABSTRACT:
A flow metering device for use as an expansion valve in a heat pump system includes a body having a flow passage extending therethrough. A piston having a flow metering port extending therethrough is moveably positioned within the flow passage. An elongated member extends through the metering port of the piston and is axially and radially fixed within the body. The elongated member has a central portion which cooperates with the metering port to prevent flow through the port when axially aligned with it. The elongated member has flow metering configurations formed thereon on both sides of the central portion. The piston is spring biased into alignment with the central portion. Refrigerant flow in either direction through the device results in movement of the piston against a spring force into a flow metering relationship with one of the metering configurations. The size of the flow metering passages defined by the flow metering port and the metering configurations are a function of the position of the piston, which is, in turn, a function of the pressure differential across the device.

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

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