Vacuum pump adapter for interchanging two vacuum pumps with different sizes

The utility model relates to a vacuum pump adapter substitute for interchanging two vacuum pumps with different sizes, and belongs to the technical field of solar cell manufacturing. Comprising a first inner welding flange, a second inner welding flange and a transition pipeline, the first inner welding flange is used for being connected with an outlet flange of a pumping pipeline during use, the second inner welding flange is used for being connected with an inlet flange of a designated vacuum pump during use, and the designated vacuum pump is a vacuum pump with the smaller size in a first vacuum pump and a second vacuum pump. The two ends of the transition pipeline are welded to the first inner welding flange and the second inner welding flange respectively, and the end face height difference between the first inner welding flange and the second inner welding flange is the height difference between the outlet flange of the pumping pipeline and the inlet flange of the designated vacuum pump. After two vacuum