| 摘要 |
PROBLEM TO BE SOLVED: To provide a compressed air supply device for air blow which can supply compressed air at a stable air flow rate and save energy. SOLUTION: An inverter part 28 provided at a motor 27 for driving a Roots blower 20, an output part for converting a detected pressure of a pressure sensor 15 provided at a pressure tank 10 to an electric signal, and a control device 30 provided with a setting part 31 for setting a target pressure value of compressed air are connected electrically, an output frequency to the motor for an optional pressure at the inverter part is determined in advance for storage and processing, electric power of the output frequency corresponding to a value obtained by comparing and calculating values of an electric signal of the target pressure value set at the setting part and the electric signal of the pressure detected by the pressure sensor is supplied to the motor, and the number of rotation of the Roots blower is automatically adjusted by driving control of the inverter part.
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