We Claim:
[Claim 1]
A propeller fan comprising:
a rotation-axis part that serves as a center of rotation of the propeller fan; and
5 a plurality of blades provided on an outer circumferential side of the rotation-
axis part, the plurality of blades each being joined at an leading edge of the blade to a trailing edge of an adjoining blade of the blades, the propeller fan having
a first rib provided on pressure surfaces of the plurality of blades, the first
10 rib projecting in a direction of the center of rotation of the rotation-axis part and
surrounding the rotation-axis part, and
second ribs provided on pressure surfaces of the plurality of blades, the
second ribs projecting in the axial direction of the rotation-axis part and extending
from the rotation-axis part toward the first rib, and
15 wherein, of ends of the second ribs in the axial direction of the rotation-axis
part, ends, distant from the pressure surfaces, of the second ribs project in a direction away from the pressure surfaces farther than an end of the first rib distant from the pressure surfaces, among the ends of the first rib in the axial direction of the rotation-axis part. 20
[Claim 2]
The propeller fan of Claim 1, further comprising closing ribs that close at least portions of spaces formed between the first rib and the second ribs.
25 [Claim 3]
The propeller fan of Claim 1 or 2, further comprising, on the pressure surfaces, third ribs projecting in the direction of the center of rotation and extending from the first rib toward the outer circumferential side.
30 [Claim 4]
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The propeller fan of any one of Claims 1 to 3,
wherein the first rib has, as viewed in the axial direction of the rotation-axis part, a circular outer circumferential surface.
5 [Claim 5]
The propeller fan of any one of Claims 1 to 3,
wherein the first rib includes a plurality of ribs having arc-shaped outer circumferential surfaces as viewed in the axial direction of the rotation-axis part, the plurality of ribs being configured to surround the rotation-axis part. 10
[Claim 6]
The propeller fan of any one of Claims 1 to 3, wherein the first rib has, as viewed in the axial direction of the rotation-axis part, a polygonal outer circumferential surface. 15
[Claim 7]
An outdoor unit comprising: the propeller fan of any one of Claims 1 to 6; and
a heat exchanger configured to exchange heat with air guided by the propeller
20 fan.
[Claim 8]
A refrigeration cycle apparatus comprising:
a refrigerant circuit having a condenser and an evaporator; and
25 the propeller fan of any one of Claims 1 to 6, which serves as a fan for guiding
air to the condenser or the evaporator.
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