Compressor control at voltage and frequency extremes of power supply
US6238188A · kind A · utility
73Cited by
13References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 15, 1998 |
| Grant date | May 29, 2001 |
| Priority date | — |
| Expiry date | Dec 15, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C2270/015
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method is presented to prevent compressor damage by reducing compressor load when operating speed either is too low or too high as can be the case at extremes of line frequency and voltage. The speed of the compressor is deduced from the knowledge of compressor load, frequency and voltage. If the compressor speed is too high or too low for a given suction and discharge pressure, the compressor load is reduced to boost the operating speed or to reduce force acting on the bearings. The compressor load reduction may be achieved by actuating an unloader valve, a suction throttling device, or some other load reduction mechanism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.