Hybrid sealing structure applied in high-pressure-difference environments

A hybrid sealing structure applied in high-pressure-difference environments is disclosed and is used under conditions of short axial dimensions to control high-pressure fluid leakage hazards in a sealed environment. The hybrid sealing structure comprises a main shaft body, and a lip-shaped seal ring and a blowing ring which are arranged between a working head disposed at the shaft end of the mainshaft body and a bearing arranged on the main shaft body, the lip-shaped seal ring and the blowing ring are disposed in a left-right direction the outside of the lip-shaped seal ring and the blowing ring is provided with end covers, and the end covers, lip-shaped seal ring, the blowing ring and the main shaft body enclose an annular air cavity. A first through hole is arranged in each end cover, and a blowhole is arranged in the blowing ring for communicating the first through holes with the annular air cavity. The hybrid sealing structure is well sealed, realizes air sealing by cleaning non-contaminated compressed ai