Document Type and Number:
Japanese Patent JPH0438918
Kind Code:
B2
Abstract:
A liquid ring pump with a conical or cylindrical port member has a vent-recirculation port in the port member in addition to the conventional intake and discharge ports. The vent-recirculation port communicates with the compression zone of the pump and is connected to a reservoir of pumping liquid maintained in the discharge portion of the pump head. When the pump is operating at relatively low compression ratios, the vent-recirculation port acts as a vent to prevent overcompression of the gas in the pump. At relatively high compression ratios, the vent-recirculation port recirculates pumping liquid from the reservoir, thereby increasing the maximum attainable compression ratio.
Application Number:
JP15944284A
Publication Date:
June 25, 1992
Filing Date:
July 31, 1984
Export Citation:
International Classes:
F04C19/00
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