Patent ID: 7815418

Claim:
A rotary vane wheel comprising: multiple blade portions; and a hub having the multiple blade portions provided on its outer circumferential surface, wherein, in the case where, of both edges of the outer circumferential surface in an axial direction of a rotation axis of the hub, one edge is an upstream side end portion and the other edge is a downstream side end portion, the outer circumferential surface has an inclined portion inclined against the rotation axis in a direction to be further away from the rotation axis as directed from the upstream side end portion to the downstream side end portion and a parallel portion formed along the rotation axis, the parallel portion is formed between a connecting portion connecting the blade portion to the outer circumferential surface and the downstream side end portion, and positioned more inward in a radial direction of the rotation axis than an extended inclined portion which is a virtual extended portion of the inclined portion continued from the inclined portion between the connecting portion and the downstream side end portion, and a rear edge side of the parallel portion at a rear edge side of the blade portion is formed from a rear edge of the blade portion to the downstream side end portion at an angle substantially equal to an inclination angle of the connecting portion of the blade portion inclined with respect to a circumferential direction centering on the rotation axis.