Stepping type unloading system for helical screw rotary compressor
US4388048A · kind A · utility
24Cited by
1References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 10, 1981 |
| Grant date | Jun 14, 1983 |
| Priority date | — |
| Expiry date | Mar 10, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C28/125
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A stepping piston is projected into the path of a slide valve drive piston to limit piston movement and thus the slide valve towards maximum unload position determined by piston bottoming out against the cylinder wall. The slide valve main drive piston stroke is also correlated to desired slide valve positions along the intermeshed helical screw rotors of the helical screw rotary compressor to provide, for example, stepped unloading at compressor full load, two-thirds full load, and one-third full load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.