Device and method for detecting dissolved gas in oil through synchronous degassing and continuous sample injection

The invention discloses a synchronous degassing and continuous sample injection dissolved gas detection device and method in oil. The device comprises an injector module, a three-way valve, a quantitative tube, a chromatographic detection module, a nitrogen cylinder, a positioning module and a control module, the injector module comprises N injectors; insulating oil samples to be analyzed are filled in needle cylinders of the injectors, and the end parts of piston core rods of the injectors are connected with the positioning module; outlets of the N injectors are respectively connected with a nitrogen cylinder and a quantitative tube through a three-way valve; when each piston core rod is positioned at a first position by the positioning module, the volume of an oil sample in each injector is V1, and when each piston core rod is positioned at a second position, the volume of nitrogen added into each needle cylinder is Vg; the control module controls the positioning module to synchronously move from a first po