Oil free screw compressor
US6287088A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 1999 |
| Grant date | Sep 11, 2001 |
| Priority date | — |
| Expiry date | Sep 16, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C2240/403
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An oil free screw compressor includes a compressor main body directly connected to a high speed motor via a drive side gear and a driven side gear having a uniform speed ratio. A bearing in a side of the high speed motor employs one having the same size as that of a bearing in a side of the compressor main body. The same material as a viscous seal provided at both end portions of a male rotor and a female rotor is used for a viscous seal provided at both end portions of a motor shaft. The high speed motor is driven by a high frequency type inverter. The electric motor side and the compressor main body side are made in a rotational shaft structure which is dummy symmetrical about a uniform gear portion. In the oil free screw compressor, a speed increasing apparatus for increasing an output of an electric motor and a suction throttle valve are not required. Then, parts in the compressor main body side and parts in the electric motor side are made common, and a structure is made simple.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.