Air feeder vane wheel

Abstract

The oblique flow blower impeller of the present invention focuses on improving fan efficiency and reducing noise, and improves these performances by improving the structure of the fan. An impeller (1) of a diagonal flow blower is formed by arranging a plurality of thin blades (6) on a roughly truncated cone-shaped hub (4), and the front edge (2) of the blades (6) is formed in the following shape: On the meridian surface of the blade (6), a concave curve is formed on the upper side of the outer peripheral side near the midpoint (BB) of the blade tip (5) of the hub (4) and the blade (6) relative to the wind. The more hub side near the point is formed as a convex curve relative to the upper side of the wind, and the radial cross-sectional shape of the blade (6) is formed as follows: the more blade tip (5) side near the midpoint is formed as a concave curve relative to the upper side of the wind , the more hub (4) side near the midpoint is formed as a convex curve relative to the upper side of the wind. And, the leading edge (2) is formed by a helical curve.

Description

(1) Technical field [0001] The present invention relates to a blower impeller used in an outdoor unit of an air conditioner, and more particularly to a structure for improving the static pressure efficiency and reducing noise of the blower. (2) Background technology [0002] In the prior art, Patent Document 1 (Japanese Patent Application Laid-Open No. 11-294389 ) describes an impeller for a diagonal flow blower formed by arranging a plurality of thin blades on a substantially truncated cone-shaped hub. [0003] Figure 13 , Figure 14 , Figure 15 A conventional oblique flow blower impeller described in Patent Document 1 is shown. Figure 13 , Figure 14 , Figure 15 Among them, the oblique flow blower impeller 30 is provided with a plurality of thin blades 35 on a substantially frusto-conical hub 33 . The leading edge 31 of the blade 35 is formed in the following shape: on the meridian plane of the blade 35, a concave curve is formed on the outer peripheral side near t...

AI Technical Summary

Problems solved by technology

In this case, the point of intersection between the leading edge 31 and the blade tip 34 becomes a point that defines the generation state of the blade tip vortex. The stripping of the negative pressure surface of the blade end vortex control, that is, the flow control will be limited, of course, this will limit the improvement of noise and fan efficiency.

In addition, when the leading edge 31 is a forward-inclined straight line, although it is possible to stagger the cut-off time of the air, it is also limited, and the improvement of noise and fan efficiency in flow control is also limited.

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