PURPOSE: To enable oil supply without possibility of mixing into a compression chamber by arranging an oil supply nozzle which is opened to an accelerator and communicates with an oil header at a position of height between the oil header and a lower most oil supply nozzle.
CONSTITUTION: When a compressor is stopped, an oil pump 6 is simultaneously stopped, for suspending oil supply to a low pressure stage compressor 1 and a high pressure stage compressor 2. Afterward, lubricating oil in each oil supply passage is returned in an oil header 9 by siphon function, and discharged into an accelerator 3 from an oil supply nozzle 35 provided on an upper portion of the oil header 9. Since the oil supply nozzle 35 is formed on an upper side of the oil header 9, however, the lubricating oil in the oil header is not discharged and held thereinside. Possibility of mixing of the lubricating oil into a compression chamber over the seal of a compressor body is eliminated. When the compressor is restarted, oil supply to a bearing and a gear is restarted only by filling the oil supply pipe 10 and the oil supply passages with the lubricating oil in the oil header 9.
| WO/2008/029759 | SCREW PUMP AND SCREW ROTOR |
| JPH08312552 | ROTOR FOR FLUID MACHINERY |
OSADA YOSHIRO
NISHIMURA HITOSHI
Next Patent: SCREW MACHINE