BLOWER, HEAT EXCHANGE UNIT AND REFRIGERATOR USING BLOWER

PROBLEM TO BE SOLVED: To provide a blower, a heat exchange unit and a refrigerator which control deterioration of airblasting performance of an impeller and an increase in airblasting noise by controlling turbulance generated at the time of confluence of an air current on the pressure surface side and an air current on the negative pressure surface side at the rear edge. SOLUTION: The air current is deflected axially by a recess 12 on the pressure surface 5 side, and the speed of the air current discharged in the axial direction is increased on the outer peripheral 4f side of the impeller 4. Furthermore, the negative pressure surface 16 side of a projection 14 part is finally made negative pressure in the rotating direction by partially lengthening a chord length by the projection 14 on the rear edge 4b side. Then the flow adheres on the negative pressure surface 16 side by the air current going around and accelerating, and the exfoliation of the air current is controlled. Thus an increase in a shearing stress caused by speed difference is controlled at the time of the confluence of the air current on the pressure surface 5 side and the air current on the negative pressure surface 6 side from the rear edge 4b, and the turbulence generated is controlled. COPYRIGHT: (C)2005,JPO&NCIPI