| 摘要 |
Defining γ as the inner angle formed when connecting an inside reference point (Q1), a blade tip (71) and an outside reference point (Q2) in that order with straight lines, it holds for this propeller fan that 12≤γ/n≤17; defining Ln as the length along an arc which is a section of a circumscribed circle (CR) and is formed between a first point (P1) and an intermediary portion (P4), it holds that 0.4≤Ln/Lm≤0.7; and, defining R1 as the length of the line segment connecting the center of the circumscribed circle (CR) and the blade tip (71) and R0 as the radius of the circumscribed circle (CR), it holds that 0.8≤R1/R0≤0.95. |
