Evaporator generated foam control of compression systems

Details Evaporator generated foam control of compression systems Evaporator generated foam control of compression systems

1999-02-05

2000-11-07

Tanner, Harry B.

Refrigeration

Automatic control

Refrigeration producer

62222, 62505, F25B 4902

Patent

active

06141980&

ABSTRACT:
A system for controlling the amount of foam ingested to a compressor of a cooling system is presented. The present invention utilizes a heated thermistor to control an electrically positioned expansion valve feeding liquid refrigerant to a system evaporator. The thermistor is controlled to be a few degrees warmer than the discharge saturation temperature of the refrigerant exiting the compressor. The saturation temperature corresponding to the compressor discharge pressure is calculated by a microprocessor and compared to the thermistor temperature. If the difference is greater or less than desired, the microprocessor will send the proper signals to the electrically positioned expansion valve thereby controlling the rate of foam ingested by the compressor.

REFERENCES:
patent: 4261180 (1981-04-01), Nozawa et al.
patent: 4620424 (1986-11-01), Tanaka et al.
patent: 4706469 (1987-11-01), Oguni et al.
patent: 5224354 (1993-07-01), Ito et al.
patent: 5709094 (1998-01-01), Ooyabu et al.
patent: 5816055 (1998-10-01), Ohman

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