Control circuit particularly adapted for use with lubrication se

Details Control circuit particularly adapted for use with lubrication se Control circuit particularly adapted for use with lubrication se

1986-01-14

1987-06-09

Miska, Vit W.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

417 13, H01H 3518, F04B 4902

Patent

active

046722319

ABSTRACT:
A pressure sensor probe has a first port connectable to a relatively low pressure source in a compressor crankcase and a second port connectable to a relatively high pressure source at the output of an oil pump. A shuttle is slidably disposed in a bore and has a first end which closes the first port when the difference in pressure between the two ports indicative of normal operation exceeds a selected value determined by the relative areas of the shuttle exposed to the respective pressures and by a coil spring which biases the shuttle away from the first port. A passage is formed between the shuttle and the bore leading from the second port to a force receiving surface on the high pressure side of the shuttle. The length and cross sectional area of the passage is selected to provide a desired dampening or time delay between the high pressure source and the force receiving surface. A control circuit includes a reed switch whose state of actuation is dependent upon the position of the shuttle. The control circuit processes the input signal from the reed switch to control the energization of the compressor motor.

REFERENCES:
patent: 2793803 (1957-05-01), Yerger
patent: 3673811 (1972-07-01), Adams et al.
patent: 4000450 (1976-12-01), Nurnberg
patent: 4017778 (1977-04-01), Koch
patent: 4028593 (1977-06-01), Newell
patent: 4042966 (1977-08-01), Newell et al.
patent: 4551069 (1985-11-01), Gilmore

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