FI921970A - Dual propeller shock resistant submersible propulsion unit - comprises shroud having water inlet and water outlet, shaft assembly centrally mounted within shroud, and up and down-stream propellers - Google Patents
Dual propeller shock resistant submersible propulsion unit - comprises shroud having water inlet and water outlet, shaft assembly centrally mounted within shroud, and up and down-stream propellers Download PDFInfo
- Publication number
- FI921970A FI921970A FI921970A FI921970A FI921970A FI 921970 A FI921970 A FI 921970A FI 921970 A FI921970 A FI 921970A FI 921970 A FI921970 A FI 921970A FI 921970 A FI921970 A FI 921970A
- Authority
- FI
- Finland
- Prior art keywords
- shroud
- propellers
- shaft assembly
- upstream
- downstream
- Prior art date
Links
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The high-thrust, shock-resistant submersible propulsor unit comprises of a shroud having a water inlet and a water outlet, a shaft assembly centrally mounted within the shroud, and an upstream and a downstream propeller, each of which includes a separate hub rotatably mounted on the shaft assembly, first and second electric motors for independently 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 on the shroud around the rotor, and first and second bearing assemblies, each of which includes a thrust bearing disposed within the hubs of the upstream and downstream propellers in the shaft assembly. The thrust bearings associated with the first and second bearing assemblies are located on opposite ends of the shaft assembly. Each of the bearing assemblies includes a removable cover which affords easy and separate access to the bearing contained in each. The pitch of the upstream and downstream propellers is different so that they may be counter-rotated to produce torque free thrust. In the preferred mode of operation, the propellers are rotated at different speeds such that the upstream propeller supercharges the downstream propeller.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI921970A FI109679B (en) | 1992-04-30 | 1992-04-30 | Dual propeller shock resistant submersible propulsion unit - comprises shroud having water inlet and water outlet, shaft assembly centrally mounted within shroud, and up and down-stream propellers |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI921970 | 1992-04-30 | ||
FI921970A FI109679B (en) | 1992-04-30 | 1992-04-30 | Dual propeller shock resistant submersible propulsion unit - comprises shroud having water inlet and water outlet, shaft assembly centrally mounted within shroud, and up and down-stream propellers |
Publications (3)
Publication Number | Publication Date |
---|---|
FI921970A0 FI921970A0 (en) | 1992-04-30 |
FI921970A true FI921970A (en) | 1993-10-31 |
FI109679B FI109679B (en) | 2002-09-30 |
Family
ID=8535205
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FI921970A FI109679B (en) | 1992-04-30 | 1992-04-30 | Dual propeller shock resistant submersible propulsion unit - comprises shroud having water inlet and water outlet, shaft assembly centrally mounted within shroud, and up and down-stream propellers |
Country Status (1)
Country | Link |
---|---|
FI (1) | FI109679B (en) |
-
1992
- 1992-04-30 FI FI921970A patent/FI109679B/en active
Also Published As
Publication number | Publication date |
---|---|
FI921970A0 (en) | 1992-04-30 |
FI109679B (en) | 2002-09-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5185545A (en) | Dual propeller shock resistant submersible propulsor unit | |
CA2137607C (en) | Waterjet propulsor powered by an integral canned electric motor | |
US2509442A (en) | Inverse rotor | |
US5078628A (en) | Marine propulsor | |
US3112610A (en) | Constant pressure shrouded propeller | |
US2714866A (en) | Device for propelling a ship | |
US20080089786A1 (en) | Counter-Rotating Integrated Propeller Assembly | |
EP0169682A2 (en) | Fluid machine | |
US3405526A (en) | Multiple stage, hydraulic jet propulsion apparatus for water craft | |
EP2432683B1 (en) | Support of propeller unit for a vessel | |
US2652505A (en) | Inverse rotor | |
JPH0698951B2 (en) | A unit having a ship propulsion unit screw and a guide impeller installed after the unit. | |
US6435120B2 (en) | Thruster | |
FI921970A (en) | Dual propeller shock resistant submersible propulsion unit - comprises shroud having water inlet and water outlet, shaft assembly centrally mounted within shroud, and up and down-stream propellers | |
RU2119875C1 (en) | Shipboard propeller-engine plant, type swivel column | |
KR930021494A (en) | Impact resistant underwater propulsion system with double propeller | |
RU2136539C1 (en) | Hydrodynamic propulsor | |
Holt et al. | High efficiency, counter-rotating ring thruster for underwater vehicles | |
RU184128U1 (en) | Biirotative electromotive steering column | |
US5509830A (en) | Marine propulsor cooling and lubricating system | |
GB2160618A (en) | Ship's propeller arrangement | |
JPH06263092A (en) | Electric driving device for contra-rotating propeller | |
SU1766780A1 (en) | Electrical driver-propeller unit | |
SU1766608A1 (en) | Withdrawal of casting | |
KR930021497A (en) | Marine propulsion unit with integrally formed motor |