Japanese Patent JPS6239278

B2

A two-stage liquid ring pump (10) comprises a suction end casing (12), a first stage body portion (14), first and second stage centre plates (16) and (18), second stage body portion (20) and discharge end casing (22), these parts being clamped together by bolts (32). End bearing housings (40,42) journal a shaft (48) which is eccentrically mounted with respect to the cylindrical first and second stage pumping chambers (54) and (56) and carries first and second stage impellers (58) and (60). A suction inlet (24) directs fluid into a suction manifold which connects with suction ports located at both ends of the first stage pumping chamber (54) and the first stage impeller (58) discharges this fluid under pressure from first stage discharge ports such as (72) into discharge manifold (28) which directs the fluid into section stage suction ports such as (80) located at both ends of the second stage pumping chamber (56). The second stage impeller (60) drives the fluid admitted to second stage pumping chamber (56) through discharge ports such as (88) into discharge plenum (86) and thence to discharge outlet (30). For the purpose of reducing noise and vibration in the pump whilst maintaining ease of manufacture of the impellers, the impellers each are formed with a prime number of equally spaced blades and, to appreciably reduce peak noise levels, the two impellers (58) and (60) have different numbers of blades.

JEEMUSU BAA FUITSUCHI

JP15734179A

August 21, 1987

December 04, 1979

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GEN SIGNAL CORP

F04C7/00; F01C21/08; F04C11/00; F04C19/00; F04C23/00; F04C29/06

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