Vacuum pump
OwnerYoshihiro Yamashitainventor
Life of this patent
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Abstract
The present invention provides a vacuum pump having a small possibility of causing a damage of a rotor, excellent in working efficiency of the balancing of the rotor, and capable of keeping the balance during a long period of time. A ring shape groove is formed at a lower portion side internal surface of a rotor along the circumferential direction of the rotor. A weight for catching the balance of the rotor is fitted in and attached to the ring shape groove. Accordingly, there is no change of the section and no notch in the circumferential direction of the outer circumference of the rotor so that the stress concentration or the like is not caused and the maximum stress of the rotor is reduced, whereby the damage of the rotor is not easily caused.
Claims8
A vacuum pump comprising:
- a pump case forming an inlet port at an upper surface;
- a rotor provided rotatably in the pump case;
- rotor blades provided integrally with an outer circumferential surface of the rotor;
- stator blades positioned and arranged between the rotor blades or at the outside thereof;
- a driving motor for rotating the rotor;
- and
- a ring shape groove formed at an internal surface of a lower portion side of the rotor.
Dependencies are inferred from the claim text.