Patent ID: 6599108
Filing Date: 2003-07-29
Classification: F04D,F05D

Abstract:
A vacuum pump comprising:a pump case having an interior space; a rotor disposed in the interior space of the pump case; a thread stator disposed in the interior space of the pump case and opposite to an outer peripheral surface of the rotor; a thread groove formed in one of the thread stator and the rotor; at least one heater disposed in the thread stator for heating the interior space of the pump case; send-out means for sending out a parameter constituting a factor for determining a temperature of the rotor; a memory for storing a database containing information corresponding to a relationship between the parameter sent out from the send-out means and a preselected temperature of the heater; and control means for inputting the parameter sent out by the send-out means and for selecting from the database stored in the memory the preselected temperature of the heater in accordance with the input parameter.