Gas cylinder surface sealing device with cantilever support and spiral chute

The invention discloses a gas cylinder surface sealing device with a cantilever support and a spiral chute. The device comprises a sealing retainer, a rotor journal, a floating sealing ring and a cantilever supporting plate, wherein a dynamic pressure cylindrical sealing area is formed between the cylindrical sealing interface of the floating sealing ring and the cylindrical surface of the rotor journal, a high-pressure area and a low-pressure area are respectively arranged on two sides of the floating sealing ring, and the rotor journal and the floating sealing ring rotate relatively; and the floating sealing ring is supported by a plurality of cantilever sheets which are distributed circumferentially, and the cantilever sheets are fixed by the sealing retainer. The cylindrical surface gas film sealing device realizes non-contact and small-leakage sealing while adapting to the deformation in position sealing work process through the flexibility of the support and a dynamic pressure gas film, and is adaptive to the installation space requirement on non-shaft end position sealing through the cylindrical surface structure.