Flow noise suppression for electronic valves

Details Flow noise suppression for electronic valves Flow noise suppression for electronic valves

1988-06-06

1989-10-17

Tanner, Harry B.

Refrigeration

Automatic control

Time or program actuator

62222, F25B 4104

Patent

active

048738360

ABSTRACT:
A method for minimizing or eliminating the audible flow noise which accompanies the short initial period of compressor operation in an air-conditioning or refrigeration system which system utilizes an electrically-actuated expansion valve. The method is comprised of two steps used singly or in combination, said steps being (a) maintaining said valve in a closed or non-operative mode for a short period of time after the compressor is energized; and, (b) pulsing said valve at a higher-than-normal frequency for a short period of time commencing when the compressor is energized or shortly thereafter.

REFERENCES:
patent: 3537272 (1970-11-01), Hales et al.
patent: 4459819 (1984-07-01), Hargraves
patent: 4499739 (1985-02-01), Matsuoka et al.
patent: 4506518 (1985-03-01), Yoshikawa et al.
patent: 4523435 (1985-06-01), Lord
patent: 4548047 (1985-10-01), Hayashi et al.
patent: 4571951 (1986-02-01), Szymaszek
patent: 4677830 (1987-07-01), Sumikawa et al.
patent: 4697431 (1987-10-01), Alsenz
patent: 4766735 (1988-08-01), Gotou

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