| 摘要 |
PROBLEM TO BE SOLVED: To protect a radiator and an axial flow fan. SOLUTION: A projection length B when a part 212b of a negative pressure surface 212a of a blade 212 from a proximity part P1 closest to a core surface 110a of a radiator core 110 to the front edge P2 of the blade 212 is projected on the core surface 110a is set longer than a size A between tubes 111. Thus, even if the blade 212 collides with the radiator core 110, the tip side of the blade 212 is prevented from sticking the tube 111. Break of the tube 111 and locking of the axial flow fan 210 can be prevented, so that the radiator 100 and an air blower 200 can be protected.
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