Control system for helical screw compressor
US4052135A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 1976 |
| Grant date | Oct 4, 1977 |
| Priority date | — |
| Expiry date | May 11, 1996 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C28/125
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A helical screw air compressor unit has a rotary capacity control valve, a compressor inlet throttling valve, and a pressure relief valve for venting the compressor discharge conduit. A control circuit senses pressure in the compressed air supply system downstream of the compressor and operates the capacity control valve, inlet throttling valve, and pressure relief valve in a predetermined sequence to provide an improved power consumption characteristic for variable demand compressor applications. The control circuit includes a hydraulic control valve and an actuator for operating the rotary capacity control valve to regulate compressor throughput to maintain a predetermined pressure without overpressuring the supply system during operation at conditions of reduced demand for compressed air.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.