Screw-type rotary fluid machine including rotors having treated surfaces
US5314321A · kind A · utility
18Cited by
5References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 28, 1992 |
| Grant date | May 24, 1994 |
| Priority date | — |
| Expiry date | Oct 28, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12944
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A screw-type rotary fluid machine such as a compressor or a vacuum pump has male and female rotors which rotate within a casing, with or without mutual contact. At least one of the male and female rotors being surface-treated to have a treated surface structure. The treated surface structure is a multi-layered structures composed of a plurality of layers including a non-electrolytic Ni plating layer and at least one covering layer of organic resin. The organic resin may be one or more kinds selected from a group of engineering plastics, so as to improve mechanical strength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.