| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the leak flow at the outer peripheral end of a blade and contrive the increase of air volume by a method wherein the outer diameter of a propeller fan, superposed with a mouth ring in the axial direction of the same, is made larger than at least one maximum outer diameter of upstream or downstream side while the part of inner diameter of the mouth ring, corresponding to the part, is made larger than the maximum inner diameter in the upstream and downstream of the mouth ring. SOLUTION: The outdoor unit 1 of an air conditioner is provided with a heat exchanger 2 therein while air is passed through the heat exchanger 2 by the rotation of a propeller fan arranged in the downstream side of the heat exchanger whereby heat exchange is effected. In this case, a part 8, whereat the outer diameter 2D of the propeller fan 6 is increased locally, is formed at a part, whereat the trailing rim side of the propeller fan 6 is superposed axially with a mouth ring 5, while another part 7, whereat the inner diameter becomes larger locally than the inner diameter 2Db of the mouth ring 5, is formed at a part whereat the mouth ring 5 is superposed axially with the propeller fan 6. The diameters of the propeller fan 6 and the mouth ring 5 are changed locally in such a manner whereby a projected clearance S can be reduced and the amount of leakage can be reduced.</p> |
