Diagonal flow fan and air conditioner equipped with the diagonal flow fan

Abstract

The invention provides a diagonal flow fan and an air conditioner equipped with the diagonal flow fan. The diagonal flow fan comprises a rotatably drive wheel hub (4B) and a plurality of blades (4A) arranged around the wheel hub (4B). Each of the blades is equipped with a leading edge (41) and a trailing edge (42). The leading edge (41) has a bending part (Lc) and a radially external linear leading edge extending radially and outwardly from the bending part (Lc) and substantially parallel to the trailing edge (42) of an adjacent blade (4A). The distance between the leading edge (41) and the trailing edge (42) of an adjacent blade (4A) is set to be greater than the wheel hub at the radial external direction. The diagonal flow fan reduces noises especially the sound caused by the rotation of the blades (4A), and improves the air supply balance of the blades (4A) so as to improve the air supply performance. Meanwhile, the productivity of the fan is increased.

Description

technical field [0001] The present invention generally relates to a diagonal flow fan installed in an outdoor unit or an indoor unit of an air conditioner, and particularly but not exclusively relates to a lightweight diagonal flow fan with improved efficiency and increased air volume. The present invention also relates to an air conditioner having such a diagonal flow fan. Background technique [0002] Figure 7 A conventional diagonal flow fan is shown, which includes a rotating shaft 13 , a hub 14 fixed on the rotating shaft 13 , and a plurality of blades 11 rigidly fixed to or integrally formed with the hub 14 on the outer periphery of the hub 14 . Each blade 11 has a curved leading edge 11a and a curved trailing edge 11b (see, for example, Japanese Patent No. 3608038). [0003] However, in this conventional oblique flow fan, if the interval between the leading edge 11a and the trailing edge 11b of the adjacent blade is not properly designed, the trailing edge vortex ge...

AI Technical Summary

Problems solved by technology

[0003] However, in this conventional oblique flow fan, if the interval between the leading edge 11a and the trailing edge 11b of the adjacent blade is not properly designed, the trailing edge vortex generated from the trailing edge 11b will interfere with the downstream blade 11, resulting in increased noise

In particular, if considerable turbulence hits the downstream blades 11, the sound of the blades turning will increase significantly, which results in an unpleasant noise at a certain frequency (rotational speed of the shaft 13 x number of blades 11)

Also, in a turbulent flow field, the blades 11 cannot function sufficiently to provide the original air volume or the required pressure increase, resulting in reduced performance

[0004] In addition, since the leading edge 11a and the trailing edge 11b of each blade 11 are formed in a curved shape, it is not easy to mold using, for example, resin in the manufacturing process of the fan, resulting in a decrease in productivity.

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