Axial-flow type surging-prevention metro fan impeller

The utility model discloses an axial-flow type surging-prevention metro fan impeller, comprising a blade; a blade shank connected with a wheel hub is arranged at the root part of the blade, the blade is connected with the wheel hub by the blade shank, and a concave hole is arranged on the top end surface of the blade; the technical proposal is that: a surging-prevention area is formed by matching a plurality of small holes at the top end of the blade and a fan shell, the small holes at the top end of the impeller are matched with the fan shell, an annular sinking surging-prevention area is formed in the operating process of the fan to inhibit the development of impeller entrance vortex, prevent the back flow of air flow at the root part of the fan and avoid the surging phenomenon of the fan. In the operating process of the fan, an original surging-prevention ring structure is discarded by the fan in the improved proposal, the structure of the fan is not only simplified, the manufacturing process is optimized,