Two-stage submersible propulsor unit for water vehicles

Details Two-stage submersible propulsor unit for water vehicles Two-stage submersible propulsor unit for water vehicles

1990-08-23

1994-02-22

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 87, 310 90, 440 38, 440 80, 384 97, H02K 1600, B63H 510, B63H 11103, F04D 1902

Patent

active

052890686

ABSTRACT:
A two-stage submersible propulsor unit comprises a shroud having a water inlet and a water outlet, a shaft assembly centrally mounted within the shroud, an upstream and a downstream propeller, each of which includes a separate hub rotatably mounted on the shaft assembly, first and second electric motors separately rotating the upstream and the downstream propellers. Each motor includes a rotor mounted around the outer periphery of one of the propellers and a stator mounted around the shroud, and first and second thrust bearing assemblies for absorbing the thrust load generated between the hubs of the first and second propellers and the shaft assembly. Both thrust bearing assemblies are contained within a housing located on the downstream end of the shaft assembly. The shaft assembly includes a stationary outer shaft where the first and the second propellers are rotatably mounted, and a rotatable inner shaft which is connected to the hub of the upstream propeller for transferring thrust from the upstream propeller to the first thrust bearing assembly located in the downstream end of the shaft assembly. The foregoing arrangement advantageously avoids positioning a thrust bearing assembly in front of the upstream propeller which in turn would interfere with the smooth flow of water into the unit, and create noise.

REFERENCES:
patent: 1996195 (1933-05-01), Ferguson
patent: 2537310 (1951-01-01), Lapp
patent: 3143972 (1964-08-01), Smith et al.
patent: 3708251 (1973-01-01), Pierro
patent: 4360751 (1982-11-01), Arnold, Jr. et al.
patent: 4389197 (1983-06-01), Ballantine
patent: 4459087 (1984-01-01), Barge
patent: 4831297 (1989-05-01), Taylor et al.
patent: 4876492 (1989-10-01), Lester et al.
patent: 4993848 (1991-02-01), John et al.
Brochure of Jastram-Werke GmbH KG entitled "Jastram Forschung-From the Idea to the Marketable Product" dated Aug. 1988.

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