Rotary kinetic fluid motors or pumps – With shaft connected fluid abutment member in sealing fluid...
Patent
1996-04-01
1999-02-02
Verdier, Christopher
Rotary kinetic fluid motors or pumps
With shaft connected fluid abutment member in sealing fluid...
415111, 415112, 415113, 4151682, 4151711, 415176, 277 14R, 277 67, 277133, F04D 2910
Patent
active
058655972
ABSTRACT:
A pump incorporates a housing with a pump chamber and an internal bore communicating with the pump chamber, and a power driven impeller shaft supported in the housing by at least one bearing in the internal bore. The impeller shaft has an impeller in the pump chamber. A seal mechanism is in the internal bore between the bearing and the pump chamber providing a seal between the impeller shaft and the wall surface of the internal bore. The internal bore has a stepped configuration with small and large diameter portions and a vertical wall defined therebetween. The large diameter portion defines an intermediate chamber between the bearing and the pump chamber and that chamber connects with the pump chamber. The intermediate chamber contains liquid with air being trapped in the remaining portion of the intermediate chamber. The bearing and the seal mechanism are located in the small diameter portion. A partition wall member in the intermediate chamber divides the chamber into a first compartment adjacent the pump chamber and a second compartment adjacent the seal mechanism. The first and second compartments are connected at the upper and radially outer peripheral portion of the intermediate chamber. A device provided on the impeller shaft forces the liquid in the second compartment when the impeller shaft rotates, so as to displace into the first compartment, while the air concentrates in the second compartment around the impeller shaft, thereby excluding liquid from the sealing mechanism.
REFERENCES:
patent: 3731940 (1973-05-01), Spruiell
patent: 4426088 (1984-01-01), Ernst
patent: 4521151 (1985-06-01), Frater et al.
McDonald, D.P.; "Hydrodynamic Seals--Joints Hydrodynamiques"; Pumps-Pompes-Pumpen; pp. 110-114.
European Search Report for EP 96 10 4897, Jul. 1996.
Aisin Seiki Kabushiki Kaisha
Verdier Christopher
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