Gas mixer for medical laboratory

The invention belongs to the technical field of medical experiment equipment, and particularly relates to a gas mixer for a medical laboratory, which comprises a base, a gas mixing cavity is fixed on the upper side of the base, a driving mechanism is arranged in the base, the output of the driving mechanism is connected with two connecting plates, and a double-helix fan blade is arranged in the mixing cavity. The two ends of the double-spiral fan blade are rotationally connected with the mixing cavity through connecting shafts, gas pumping assemblies are arranged on a pair of side walls of the mixing cavity, the two connecting plates are connected with movable parts in the gas pumping assemblies respectively, and one connecting shaft penetrates out of the mixing cavity and is connected with the two connecting plates through transmission parts. The driving mechanism is used for achieving synchronous work of the gas pumping assembly and the double-spiral fan blades, and a gas circulation conveying assembly is f