Fingertip-brush type composite multi-stage low-hysteresis sealing structure

The invention relates to a fingertip-brush type composite multi-stage low-hysteresis sealing structure, and belongs to the technical field of aero-engine sealing. The device comprises a mounting seat, a fusion welding area I, a front baffle plate, a high-pressure fingertip sheet, a low-pressure fingertip sheet, a rear baffle plate I, a partition plate, a rear baffle plate II, a rear baffle plate III, a brush ring, a screw, a fusion welding area II, a brush wire bundle and a rotor, the front baffle, the high-pressure fingertip piece, the low-pressure fingertip piece and the rear baffle I form a fingertip sealing structure, a stepped groove is formed in the left side of the rear baffle I, a stepped cavity I is formed by the stepped groove of the rear baffle I and the right side of the low-pressure fingertip piece, and the brush ring is fixedly connected into the stepped cavity I of the rear baffle I through screws. The sealing structure has good self-adaptability, and the purpose of reducing the sealing leakage