Brush type sealing device with pressure limiting protection function

The invention provides a brush type sealing device with a pressure limiting protection function, and belongs to the technical field of aero-engine sealing. The brush type sealing device comprises a pressure limiting shell, a pressure limiting block, a pressure adjusting spring, a fastening block, a pressing plate, a front plate, brush wires, a back plate and a runway; the pressure limiting shell is provided with a stepped hole and a pressure relief hole communicated with the stepped hole; the pressure limiting block is arranged in the stepped hole and limited in the stepped hole through the pressure adjusting spring and the fastening block. The front plate, the back plate and the brush wires form a brush sealing assembly, and the brush sealing assembly is fixed to the pressure limiting shell through the pressing plate and forms a sealing device with the runway. And when the preset pressure difference exists on the two sides of the brush sealing assembly, the air flow pushes the pressure limiting block to move