Device for expanding stable running area of centrifugal compressor and centrifugal compressor

The utility model discloses a device for expanding a stable running area of a centrifugal compressor. The device comprises a plurality of dynamic pressure sensors with high frequency response, a dynamic strain indicator with high frequency response, a signal conditioning device, a signal processing DSP (digital signal processer) module and an airflow jetting device, wherein the dynamic pressure sensors and the dynamic strain indicator are used for acquiring dynamic signals generated during the running of the compressor, the signal conditioning device is used for sending the dynamic signals to the DSP module, the DSP module is used for processing the dynamic signals and sending a demand to a controller for controlling the airflow jetting device to act. Through the adoption of the device disclosed by the utility model, the stable running area (stable work range) of the centrifugal compressor can be expanded, the damage of flowing unstability, namely stall and surging, can be eliminated or reduced. The utility model further discloses a centrifugal compressor equipped with the device for expanding the stable running area of the centrifugal compressor.