Patent ID: 8257043

Claim:
A multiblade impeller comprising a main plate, a side plate having a suction port at a center thereof, and a plurality of blades that are provided between the main plate and the side plate and extend in a radial direction in an arc form, wherein the main plate and the side plate each have a plurality of ridge portions extending in the radial direction in an arc form so as to coincide with the shape of the blades extending in the radial direction in an arc form; and end portions of the blades are inserted in grooves formed inside the ridge portions of the main plate and the side plate, and are fixed to the ridge portions by being bent, wherein a hub is provided at a central portion of the main plate, caulking convex portions are provided in the hub, slits are provided in the main plate, the main plate is press fitted into the caulking convex portions of the hub and the caulking convex portions are crushed so that the hub and the main part is joined.