Centrifugal machine on-line oxygen content detection and nitrogen protection device

The utility model discloses a centrifugal machine on-line oxygen content detection and nitrogen protection device which comprises a pump and a PLC control module. A sampled gas filter, a flowmeter, a filter, and an oxygen sensor are orderly connected between the inner part of the centrifugal machine and the pump through pipelines. A sample gas outlet opening is arranged at the other end of the pump. An electric control valve and a pressure-reducing valve are orderly connected between a nitrogen inlet opening and a nitrogen inflation opening through pipelines, wherein the nitrogen inlet opening leads to the inner part of the centrifugal machine. The pipeline between the nitrogen inlet opening and the electric control valve is provided with a pressure gauge, signal output ends of the pressure gauge and the oxygen sensor respectively access a signal input end of the PLC control module, a signal output end of the PLC control module is connected with an oxygen control instrument and an alarm device, and the signal