Pump
US3981628A · kind A · utility
Inventor
Key dates
| Filing date | Apr 8, 1974 |
| Grant date | Sep 21, 1976 |
| Priority date | — |
| Expiry date | Apr 8, 1994 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF17C2227/0178
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Submersible electric motor driven inducer equipped centrifugal pump units, especially suitable for the pumping of cryogenic fluids or fluids at their boiling point, and capable of maintaining full flow under low submergence conditions are provided by disconnecting the inducers from co-rotation with the main impeller shaft while still retaining the main shaft for support and are powered by a source in the unit such as a slip coupling, a hydraulic turbine driven by pumpage from the pump impeller, or a separate electric motor. These power sources drive the inducer at speeds slower than the pump impeller to develop the desired suction head for the impeller without drawing excessive power or producing undesirable thrusts and reduce pump-out time for the last few feet of cargo. A hydraulic or magnetic clutch coupling with the main electric motor drive may be used in combination with the turbine power source for the inducer to start the pumping action. The inducers preferably have two spiral blades and are preferably driven at about one-half to two-thirds the speed of the main impeller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.