F - Mech Eng,Light,Heat,Weapons – 04 – D
Patent
F - Mech Eng,Light,Heat,Weapons
04
D
277/12, 103/120
F04D 29/08 (2006.01) F04D 29/16 (2006.01)
Patent
CA 1064770
ABSTRACT OF THE DISCLOSURE A flushing liquid system for an improved wearing ring in a centrifugal pump which wearing ring has spaced flushing li- quid inlet and outlet chambers, has a first control assembly for supplying flushing liquid to the flushing liquid inlet chamber and a second control assembly for returning or draining at least a portion of the flushing liquid through the flushing liquid out- let chamber, with respective first and second control assemblies either having a predetermined setting or operatively responsive to signals from sensory devices for sensing at least one or more operating conditions of the centrifugal pump to that the operation of the first and second control devices can act to minimize flush- ing liquid requirements of the wearing ring and minimize dilution by the flushing liquid of the process fluid or mixture being pumped by the centrifugal pump. Additionally, the improved wear- ing ring for use in said flushing liquid system having a first groove of the outer surface thereof operative to form the flush- ing liquid inlet chamber connected to the source of flushing li- quid, a second groove on the outer surface of the wearing ring dis- posed a spaced distance from said first groove operative to pro- vide the flushing liquid outlet chamber, a plurality of first and second passages to communicate the respective first groove and second groove with the leakage joint formed by said wearing ring with the impeller for said centrifugal pump, said first groove and second groove operative to permit at least a portion of the flushing liquid delivered from said first groove to be returned or drained through the second grove. Additionally, means formed in the leakage joint between the improved wearing ring and the impeller of the centrifugal pump to resist axial flow of the pro- cess fluid being pumped by the centrifugal pump into the leakage joint from either direction.
256657
Karassik Igor J.
Thaw Charles H.
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