Propeller fan, air-conditioning apparatus and ventilator

1. A propeller fan comprising:

a boss provided on a rotation axis; and

a blade provided at an outer circumferential portion of the boss, the blade including a leading edge and a trailing edge, the blade including a first area, a first sub-area located inward of the first area and a second sub-area located outward of the first area, the first area including a single notch formed in the trailing edge, each of the first sub-area and the second sub-area including plural notches continuously formed in the trailing edge, the single notch in the first area extends from an outward-most notch of the plural notches of the first sub-area to an inward-most notch of the plural notches of the second sub-area and divides wind flowing over the first area into lower velocity wind which flows over the first sub-area and the second sub-area in the trailing edge, the single notch in the first area being larger than each of the plural notches in each of the first sub-area and the second sub-area, each of the plural notches of the first sub-area have a same first width, and each of the plural notches of the second sub-area have a same second width, wherein width is defined as a distance between adjacent crest portions located on both sides of the respective notch,

wherein the single notch in the first area has a third width which is greater than the first width of each of the plural notches in the first sub-area and the second width of each of the plural notches in the second sub-area,

further comprising a second area formed inward of the first sub-area, the second area including plural notches continuously formed in the trailing edge, an outward-most notch of the plural notches of the second area extends to an inward-most notch of the plural notches of the first sub-area, the plural notches of the second area have a same fourth width which is greater than the first width and the second width and smaller than the third width, and

a relationship between velocities V 1 , V 2 and V 3 satisfies V 1 >V 3 >V 2 , where

V 1 is velocity of wind at a surface of the blade which flows toward the single notch,

V 2 is velocity of wind which flows over the second area in the trailing edge,

V 3 is velocity of wind which flows over the first sub-area and the second sub-area in the trailing edge after the wind having velocity V 1 is divided by the single notch.

2. The propeller fan of claim 1 , wherein the single notch in the first area has a depth which is greater than a depth of each of the plural notches in each of the first sub-area and the second sub-area.

3. The propeller fan of claim 1 , wherein a sum of a first width of the first sub-area in a radial direction of the propeller fan and a second width of the second sub-area in the radial direction is greater than or equal to a third width of the first area in the radial direction.

4. The propeller fan of claim 1 , wherein the first area is located outward of an intermediate portion of the blade in a radial direction of the propeller fan.

5. The propeller fan of claim 1 , wherein the single notch in the first area, the plural notches in the first sub-area and the plural notches in the second sub-area are continuously formed along the trailing edge.

6. The propeller fan of claim 1 , wherein

a pitch at which corresponding points on the plural notches of the first sub-area are located is equal to the first width of each of the plural notches of the first sub-area,

a pitch at which corresponding points on the plural notches of the second sub-area are located is equal to the second width of each of the plural notches of the second sub-area.

7. An air-conditioning apparatus comprising the propeller fan of claim 1 .

8. A ventilator comprising the propeller fan of claim 1 .