Integrated centrifugal pump and motor
US5158440A · kind A · utility
169Cited by
17References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 8, 1991 |
| Grant date | Oct 27, 1992 |
| Priority date | — |
| Expiry date | Nov 8, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D29/186
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An integrated centrifugal pump and motor is provided by an impeller disk which contains permanent magnets and functions as the rotor for a brushless DC motor. The rotor is supported by non-contacting radial bearings and is hydrodynamically balanced against any axial thrust so that there is no contact between rotating and stationary elements during operation. Since the impeller disk is also the motor rotor, there is no need for a shaft, in the ordinary sense, which would penetrate the case and, thus, require seals. The resulting pump is compact and can be operated electronically at variable speeds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.