Closed loop compressed gas system with oil mist lubricated screw compressor
US4375156A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 3, 1980 |
| Grant date | Mar 1, 1983 |
| Priority date | — |
| Expiry date | Oct 3, 2000 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C29/023
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A rotary helical screw compressor for a refrigeration system employing a condensable refrigerant comprises intermeshed rotors mounted for rotation by way of anti-friction bearings, within a hermetic housing. A lubricating oil miscible in liquid refrigerant is supplied to the compressor in a mass ratio of between 0.25 and 12%, by weight of solution. Vaporized working fluid at discharge pressure and bearing oil mist is permitted to seep through the anti-friction bearings in closed loops, from the discharge side of the machine towards the suction side, for effective lubrication. Thus, the refrigeration system is oil pump free, oil sump free, and oil filter free. Liquid refrigerant oil solution may be bled from the condenser and injected into the compression chamber defined partially by the intermeshed rotors at a point in the compression process where the compression chamber is cut off from suction and discharge sides of the compressor, for cooling the rotors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.