IMPELLER FOR CENTRIFUGAL TYPE AIR BLOWER CONTAINING BLADE OF IMPROVED SHAPE

摘要

PURPOSE: An impeller for a centrifugal typed air blower containing a blade of an improved shape is provided to contain every advantages of a sirocco typed impeller while not generating a surging zone. CONSTITUTION: An impeller(100) for a centrifugal typed air blower containing plural blades(110) comprises:each blade containing an inner arc unit and an outer arc unit being distinguished by an inflection point in a transverse section; the center of a curvature radius of the inner arc unit being arranged in the front direction of the inner arc unit while being seen from the rotary direction of the impeller; the center of the curvature radius of the outer arc unit being arranged in the rear direction of the outer arc unit; and the outer side end of the blade being arranged in the front direction of the rotary direction of the impeller before a first normal line penetrating the rotary center of the impeller and the inner side end of the blade. The impeller can contain plural blades like the traditional sirocco typed impeller(10) without generating a surging zone while not requiring an extra vein or an enlargement of the size of the blade.