Fans and air conditioners equipped with them

Abstract

The fan comprises: a hub having a rotation center line extending in a front-to-back direction; a plurality of main blades, tilted forward in the rotation direction, and having a first outer peripheral end, a first trailing edge, and a first leading edge, the first leading edge extending forward from the hub toward the first outer peripheral end in a helical curve in the rotation direction; and auxiliary blades, the same number as the main blades, tilted forward in the rotation direction, and having a second outer peripheral end, a second trailing edge, and a second leading edge, the second leading edge extending forward from the hub toward the second outer peripheral end in a helical curve in the rotation direction. The second rotational direction gradient is greater than the first rotational direction gradient, the second rotational direction gradient being the ratio of the front-to-back length of the auxiliary blades to the rotational length of the second outer peripheral end, and the first rotational direction gradient being the ratio of the front-to-back length of the main blades to the rotational length of the first outer peripheral end.

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