US Patent 10975883 Centrifugal rotary machine

A flow path includes a return bend portion which guides a working fluid to an inside in the radial direction by reversing the working fluid discharged to an outside in a radial direction from an upstream-side impeller, and a guiding flow path which is connected to a downstream side of the return bend portion and leads the working fluid to the inside in the radial direction so as to guide the working fluid to the downstream-side impeller. In a return vane which is provided in the guiding flow path, a trailing edge is formed such that a second end portion on a second side in an axial direction is positioned closer to an inside in a radial direction than a first end portion on a first side in the axial direction.