ROTOR FOR PUMP

摘要

The present invention relates to a rotor for a vacuum pump 150 having a roots pumping mechanism, the rotor comprising at least two hollow lobes 160, 162, 164, 166, each lobe having an outer wall 208 which defines a lobe profile, a hollow cavity 210 generally inward of the outer wall, and at least one strengthening rib 226 located in the cavity to resist stress on the lobes generated during rotation.

主权项

1. A vacuum pump rotor for use in a vacuum pump having a roots pumping mechanism, the rotor comprising:
a shaft; and at least two hollow lobes, each respective hollow lobe comprising:
a respective outer wall which defines a lobe profile, anda respective hollow cavity generally inward of the respective outer wall, wherein:
each respective hollow lobe comprises respective means for fixing the respective hollow lobe to the shaft,the shaft defines at least a portion of an outer surface of the rotor, andthe at least two hollow lobes and the shaft are shaped so that the outer surface of the rotor includes a generally continuous profile between the at least two hollow lobes and the shaft.