US Patent 9874219 Impeller and fluid machine

Provided is an impeller and a fluid machine which have an annular hub (21) and a plurality of blades (22) radially arranged along an outer peripheral surface of the hub (21). On a pressure surface (P1) of the blade (22), there are provided a first pressure surface (31) extending from the hub (21) side at an angle of 90 degrees or less with respect to the forward direction of the rotation direction (A), and a second pressure surface (32) extending from the first pressure surface (31) at an angle of more than 90 degrees with respect to the forward direction of the rotation direction (A). This configuration reduces a low-energy fluid stagnating on a suction surface side of the blade, achieving higher impeller efficiency.