| 摘要 |
A four-way cassette indoor unit comprises a turbo fan (1) provided with a cylindrical fan motor (8), a main plate (2) rotationally driven by the fan motor (8), a side plate (17) arranged opposite to the main plate (2), and blades (6) provided between the main plate (2) and the side plate (17), wherein the main plate (2) has a cylindrical convex part (3) protruding toward the side plate (17) in an axial direction at a central part thereof, and the fan motor (8) is accommodated inside the convex part (3), wherein an impeller (18) has an outer diameter D and the convex part (3) has a diameter L and a height H, the outer diameter D of the impeller (18) and the diameter L and the height H of the convex part (3) satisfying the relationship L/D ≤ 0.41 and the relationship H/D ≤ 0.23. |
