Centrifugal pump assembly
US4130374A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 10, 1977 |
| Grant date | Dec 19, 1978 |
| Priority date | — |
| Expiry date | Aug 10, 1997 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D29/20
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a centrifugal pump assembly in which an impeller is mounted to a motor shaft without the need for precision machining of the shaft and in which the proper spacing is automatically achieved between the impeller and the pump housing. An end of the motor shaft projects toward an impeller chamber in which a rotary impeller is situated. The impeller hub has a bore therein through which a threaded fastening means passes. The threaded fastening means mates with a threaded well in the end of a motor shaft. However, a coil spring which surrounds the fastening means abuts the shaft end and also abuts the impeller hub. The spring biases the impeller away from the wall of the pump housing and toward the interior of the impeller chamber. The spring prevents the impeller from abutting against the housing wall and the bias of the spring may be adjusted to compensate for variations in the shaft length. Further, the head of the fastening means resides within a recess in the impeller hub, the depth of which is equal to the predetermined spacing required between the impeller and the impeller housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.