Apparatus for thrust compensation on shaft of rotary pump
US5613831A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 7, 1995 |
| Grant date | Mar 25, 1997 |
| Priority date | — |
| Expiry date | Jun 7, 2015 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2360/44
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A pressure compensation system for a rotary pump prevents axial displacement of the pump shaft. The pump includes a shaft rotatable about a major axis extending centrally of the shaft, at least one impeller attached to the shaft, and a pump housing for enclosing the shaft and at least one pump impeller for generating fluid pressure for pumping upon rotation of the shaft and the at least one impeller. In these pumps, the fluid pressure can exert an axial thrust along the major axis of the shaft. Therefore, such pumps include means for thrust compensation during rotation of the shaft. The improvement in the means for thrust compensation includes a first set of permanent magnets arrayed around and attached to the shaft and a second set of permanent magnets arrayed on the pump housing. The second set of permanent magnets magnetically attracts the first set of permanent magnets to hold the shaft and the at least one impeller at a fixed position along the major axis of the shaft with respect to the pump housing. Upon rotation of the shaft generating the axial thrust along the major axis of the shaft, the first set of permanent magnets and the second set of permanent magnets oppose moveme…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.