Rotary kinetic fluid motors or pumps – Bearing – seal – or liner between runner portion and static part – Means to seal radial flow pump runner inlet from outlet
Patent
1995-11-13
1999-02-23
Verdier, Christopher
Rotary kinetic fluid motors or pumps
Bearing, seal, or liner between runner portion and static part
Means to seal radial flow pump runner inlet from outlet
4151701, 4151742, 415106, 2940202, 29888021, 298891, F04D 2916
Patent
active
058736972
ABSTRACT:
The method includes replacing conventional wear rings between a centrifugal pump casing inlet and the rotatable impeller having a plurality of circumferentially spaced blades. A substitute wear ring is formed of a thermoplastic polymer, POLY-ETHER-ETHER-KETONE (PEEK) which is thermally stable and self lubricating over a range of temperatures of from zero to 600.degree. F. Because the thermal coefficient of expansion of PEEK is substantially different from the pump casing metal and the impelled metal, the use of the PEEK allows the efficiency of the pump to be increased by correctly calculating the diameters for construction of the wear ring for operation over a selected range of temperatures of the pumped fluid. The process reduces the clearance between the surfaces of the three elements to substantially improve pump efficiency while at the same time vibration and wear are reduced substantially.
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Chevron U.S.A. Inc.
Verdier Christopher
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