Patent ID: 11971042
Assignee: EDWARDS JAPAN LIMITED
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  G | IPC F  G

Claim 0:
1. A vacuum pump capable of determining timing of rotor blade replacement, the vacuum pump comprising:
a rotor blade which is provided in a vacuum pump main body;
at least two sensors disposed in the vacuum pump main body and configured to measure physical quantities related to the rotor blade, wherein a first sensor of the at least two sensors is a temperature measurement means for measuring a temperature of the rotor blade and a second sensor of the at least two sensors is a current amount measurement means for measuring a current amount of an electrical current flowing through a motor which drives the rotor blade;
physical quantity extraction means for extracting two or more physical quantities which are measured during an operation of the vacuum pump, wherein the two or more physical quantities include the temperature of the rotor blade measured by the first sensor and the current amount of the electrical current flowing through the motor measured by the second sensor;
a time acquisition means for acquiring total time of each of a plurality of stages when the physical quantity belongs to the stage during the operation of the vacuum pump and total time of all of the stages,
wherein each stage comprises a range of current value as measured by the current amount measurement means, and
wherein the total time of each stage comprises the total time for which the current value is within the range of current values associated with each stage;

a storage means for storing the total time of each stage and the total time of all of the stages acquired by the time acquisition means; and
a control device configured to determine a ratio of the total time of each stage to the total time of all of the stages based on the stored total time of each stage and the total time of all of the stages.