Method and apparatus for controlling the operation of a centrifu

Details Method and apparatus for controlling the operation of a centrifu Method and apparatus for controlling the operation of a centrifu

1981-11-27

1983-09-20

Makay, Albert J.

Refrigeration

Processes

Lubricant handling

62193, 62217, 417 13, F25B 4302, F25B 3100

Patent

active

044048122

ABSTRACT:
A method and apparatus to prevent oil pump cavitation in a hermetically sealed vapor compression refrigeration system are disclosed. A hermetically sealed housing containing the refrigeration compressor transmission and oil supply reservoir is connected to the suction side of the compressor to equalize the pressure in the housing and the suction to the compressor is constructed with a restriction such as an orifice or a venturi to create a pressure drop or is of a size small enough to create a pressure drop when refrigerant flows through the line. The pressure drop is sensed by a pressure differential switch to anticipate sharp drops in pressure in the housing. The flow of refrigerant to the compressor is throttled in response to predetermined pressure drops to prevent a sharp drop in pressure within the transmission housing and thus prevent vigorous boiling of refrigerant from the oil reservoir. Prevention of vigorous boiling of the refrigerant from the oil prevents oil pump cavitation and loss of oil to the transmission and bearings of the compressor.

REFERENCES:
patent: 3149478 (1964-09-01), Anderson et al.
patent: 3200603 (1965-08-01), Wake et al.
patent: 3508416 (1970-04-01), Miller
patent: 4198860 (1980-04-01), King

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