F - Mech Eng,Light,Heat,Weapons – 04 – D
Patent
F - Mech Eng,Light,Heat,Weapons
04
D
103/120
F04D 29/12 (2006.01) F04D 13/08 (2006.01) F16J 15/40 (2006.01)
Patent
CA 1172907
ABSTRACT OF THE DISCLOSURE: An underwater pump operable while immersed in a body of water comprising motor means driving an output shaft. The motor means is a water proof fluid-immersed motor having a motor fluid chamber, an impeller mounted on the output shaft, an impeller casing in which the impeller operates, and an interconnecting casing disposed about the output shaft and located between the motor fluid chamber and the impeller casing, the interconnecting casing defining an interconnect fluid chamber. A first shaft sealing means is disposed about the output shaft between the motor fluid chamber and the inter- connect fluid chamber, and a second shaft sealing means is disposed about the output shaft between the interconnect fluid chamber and the impeller casing. A pressure control mechanism is mounted on the underwater pump and is adapted to be immersed in the body of water with the underwater pump. The pressure control mechanism comprises pressure-sensitive means operable to sense the pressure of the body of water about the underwater pump and transmit this pressure to the motor fluid chamber and to said interconnect fluid chamber such that both the motor fluid chamber and the interconnect fluid chamber are at the same pressure corresponding to the pressure of the water about the outside of the underwater pump, whereby equalized pressure is provided on opposite sides of the first shaft sealing means for various operating depths of the under- water pump.
380608
Robic Robic & Associes/associates
Toyo Denki Kogyosho Co. Ltd.
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