IMPELLER WASHING DEVICE FOR ROTARY MACHINE HAVING IMPELLER

PURPOSE:To eliminate dust stuck on an impeller without stopping operation of a rotary machine by providing a washing liquid injection nozzle on the intake side of the impeller, and setting, a drain separator for taking in a mixture including the dusts and the washing liquid on the discharging side of the impeller. CONSTITUTION:When a two shaft four step type isothermal compressor is operated, the vibration amount of a rotor 5 by which first and second step impellers 1, 2 are connected to each other, is monitored by a shaft vibration meter 27. When the vibration amount of the rotor 5 exceeds a set value, solenoid valves 22, 24 are opened by a controller 28, and washing liquid supplied from a wash supplying line 21 is injected from the intake side of air toward the first step impeller 1 by an injection nozzle 20 so as to eliminate dust stuck on the impeller 1. The dust is mixed into mist of the washing liquid and compressed air, and supplied to an intercooler 13. The dust collides with a blade fin shaped nest and a collide type separator inside thereof, to be stuck thereon and then corrected. On the other hand, the washing liquid is recovered on the bottom part in the intercooler 13 and reused.