| 摘要 |
<p>Provided is a highly efficient and quiet construction machine, wherein a heat exchanger has a satisfactory wind speed distribution and impact by air flowing out from an axial flow fan on an engine can be avoided. In a construction machine provided with an axial flow fan (2) having a plurality of rotor blades (2a), a fan ring (3) for leading air flow to the axial flow fan, a heat exchanger (1) disposed upstream or downstream in the air flow from the axial flow fan, and a structural body (4) disposed downstream in the air flow from the axial flow fan, the fan ring has an intake-side R-shaped part (3a) for constricting an intake-side flow channel and a discharge-side R-shaped part (3b) for expanding a discharge-side flow channel, the rotor blades are inclined at an angle of advance theta in the rotational direction from the axial center and are attached so as to be inclined forward toward the intake side, and when the axial flow fan is attached to the inner side of the fan ring, first intersection points (P) where the rear edges and outer peripheral edges of the rotor blades meet are positioned within a range the width of the discharge-side R-shaped part.</p> |
