Patent ID: 8245530

Claim:
An inlet guide vane that is turnably installed about an axis line at a suction port into which a fluid is drawn by rotation of an impeller in order to adjust a suction amount and flow direction of the fluid, the inlet guide vane comprising: a shaft that is turnably supported by inserting a round bar-shaped shaft main body portion thereof in a bearing sleeve; and a plate-shaped vane main body that is joined with the shaft and projects from an inner periphery surface of the suction port to a central portion of the suction port, the shaft including a flange portion that is provided at a distal end side in a direction of the axis line to join with the vane main body and that extends to an outside in a direction perpendicular to the axis line so as to be extended outward in a radial direction of the bearing sleeve, wherein a width of the flange portion in the direction perpendicular to the axis line is a size of at least 1.5 times an outer diameter of the shaft main body portion and/or at least ⅓ of a maximum width of the vane main body.