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(11) | EP 2 597 314 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Axial-flow fan |
(57) An axial-flow fan 100 includes an impeller 10 mounted on a rotating shaft 21 of a
rotary drive device 20 and a venture casing 30 surrounding an outer periphery of the
impeller 10 in a radial direction and including a suction port 41 and a discharge
port 42 facing each other in an axial direction of the rotating shaft 21. An inner
surface of the venture casing 30 includes a suction-side slant part 31 expending the
suction port 41 outward in the radial direction of the impeller 10, a linear part
32 continuing from the suction-side slant part 31 and forming an axial flow of a fluid
with the impeller 10, a discharge-side slant part 34 expanding the discharge port
42 outward in the radial direction of the impeller 10, and a curved part 33 connecting
the linear part 32 and the discharge-side slant part 34.
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