Combination double screw rotor assembly
US6508639B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 2001 |
| Grant date | Jan 21, 2003 |
| Priority date | — |
| Expiry date | Sep 6, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C18/16
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A combination double screw rotor assembly includes a first and a second screw rotor arranged in parallel in a casing, two sets of bearings respectively mounted in the casing near the outlet to support the shafts, and a plurality of locking means respectively fastened to the shafts near the inlet. The first and the second screw rotor each has a low pressure screw rotor element, a high pressure screw rotor element, and a spiral thread formed of a first spiral thread segment at the high pressure screw rotor element and a second spiral thread segment at the low pressure screw rotor element, the first spiral thread segment having an uniform short pitch, the second spiral thread segment having an uniform long pitch, the first spiral thread segment and second spiral thread segment of the first and the second screw rotor being respectively meshed together.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.