Patent ID: 11889595
Assignee: EDWARDS JAPAN LIMITED
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC H  F | IPC F  H

Claim 0:
1. A vacuum pump that exhausts gas by rotation of a rotating body, the vacuum pump comprising:
an exhaust flow path for exhausting the gas; and
a heating means for heating the exhaust flow path, wherein:
the heating means includes a plurality of resistance heating elements connected in parallel to a pair of wiring lines, wherein each respective resistance heating element of the plurality of resistance heating elements connects to the pair of wiring lines,
the plurality of resistance heating elements are arranged at intervals around the rotating body,
each respective resistance heating element of the plurality of resistance heating elements have respective connectors, configured to be attached and detached,
the pair of wiring lines and the respective resistance heating element is coupled by the respective connectors, and

a control means configured to:
control an operation of the vacuum pump, and
determine that heater maintenance is not necessary and continue the operation of the vacuum pump when a number of respective resistance heating element failures is smaller than a predetermined reference failure number.