Vacuum pump
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United States of America Patent
Stats
-
Nov 9, 2004
Grant Date -
May 22, 2003
app pub date -
Nov 14, 2002
filing date -
Nov 19, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention provides a vacuum pump which reduces a damaging torque produced when a rotor rotating at high-speed crashes into a screw stator or the like. The vacuum pump has a rigid ring disposed around the screw stator such that a shock load from the screw stator causes the rigid ring to rotate. When a brittle facture occurs in the rotor rotating at high-speed, for example, and a part of the rotor crashes into the screw stator, a rotating torque, i.e., a damaging torque causing the entire vacuum pump to rotate is likely to occur. However, this damaging torque is absorbed by the rotation of the rigid ring and eventually subsides.
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