LUFTZUFUHRVORRICHTUNG

摘要

Improvement is made to the shape of blades of a fan assembly for sucking air into an annular wall through slits in the wall, in order to increase the aerodynamic performance and energy efficiency. In the fan assembly for sucking air in through slits provided in an annular wall (2), the blade tips of an axial fan (21) are bent in the rotating direction to smoothly take in air flowing in through the slits. The axial fan is formed so that the blades except the tips thereof are in a shape of a radial or a rearward tilting blade. The angle formed by the blade forward tilting angle near the blade tip of the axial fan and the slit angle is between -5 and 15 DEG , and the blade tip is bent in the wind blowout direction. This configuration improves the P-Q characteristic, reduces noise and improves energy efficiency.