Sealing in helical trochoidal rotary machines
US10844859B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 29, 2020 |
| Grant date | Nov 24, 2020 |
| Priority date | — |
| Expiry date | Feb 29, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K21/28
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Sealing in rotary positive displacement machines based on trochoidal geometry that comprise a helical rotor that undergoes planetary motion within a helical stator is described. Seals can be mounted on the rotor, the stator, or both. The rotor can have a hypotrochoidal cross-section, with the corresponding stator cavity profile being the outer envelope of the rotor as it undergoes planetary motion, or the stator cavity can have an epitrochoidal cross-section with the corresponding rotor profile being the inner envelope of the trochoid as it undergoes planetary motion. In some embodiments, the geometry is offset in a manner that provides advantages with respect to sealing in the rotary machine. In multi-stage embodiments, the rotor-stator geometry remains substantially constant or varies along the axis of the rotary machine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.