Patent ID: 7862301

Claim:
A laminated impeller comprising an impeller seat, a plurality of blades connected on said impeller seat to form a single impeller body, wherein a plurality of said single impeller bodies being connected in succession to form said laminated impeller, each said impeller seat being provided with a connecting mechanism for connecting adjacent said single impeller body; said connecting mechanism is a bell and spigot coupler on a rim of said impeller seat, the spigot on one end face and the bell on the other end face; said impeller seats are divided into a main impeller seat with a boss-shaped shaft hole and auxiliary impeller seats, the boss-shaped shaft hole is connected with the rim by supporting ribs, said main impeller seat and said auxiliary impeller seat are connected with each other; said bell and said spigot are positioned in staggered arrangement, a reinforcing sheath is mounted around said boss-shaped shaft hole, a recess provided with radial through hole opened in the outer fringe and a nut pre-mounted in the recess and a screw set on said nut.