JPS5669496A - Two-stage turbine pump - Google Patents

Abstract

PURPOSE: To shorten a rotary shaft, to reduce impeller axial thrust, and to reduce pressure applied on a shaft sealing device while maintaining high efficiency by providing two-stage impellers with their back faces facing to each other through a retainer to make the device double suction type.

CONSTITUTION: By arranging two back face shrouds of the first and the second impellers 5, 22 face to each other through a retainer 7, they can be fitted on one impeller boss 18 which can be shortened, and at the same time, an axial thrust of the first impeller 5 and that of the second impeller 22 can be firmly fixed each by a bolt 43 and a stopper of the impeller boss 18. Also, as an inlet direction of the first impeller 5 is deviated by 180° from an inlet direction of the second impeller 22, both axial thrusts are canceled. Furthermore, a shaft sealing device 30 is provided on a delivery side of the first impeller 5 and the first guide blade 1 so that only a pressure of a pump at the second stage before increased is applied and the applied pressure can be reduced.

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