Axial flow fan blade and air conditioner outdoor unit

Abstract

The invention discloses an axial flow fan blade and an air conditioner outdoor unit, wherein the axial flow fan blade comprises a wheel hub and a plurality of blades; the plurality of blades are all arranged on the peripheral wall of the wheel hub at intervals along the circumferential direction of the wheel hub, wherein one blade is defined as a first blade, another blade adjacent to the first blade is defined as a second blade in the rotating direction of the axial flow fan blade, the most convex point on the front edge of the first blade, the most convex point on the front edge of the second blade and the center of the wheel hub form central angles as blade inclined angles, two adjacent blade included angles in the blade included angles formed by the three adjacent blades are alpha andbeta respectively, and alpha is not equal to beta. According to the axial flow fan blade and the air conditioner outdoor unit, superposition of the rotating noise of the current axial flow fan blade is reduced so as to avoid abnormal noise generated by the axial flow fan blade.

Description

technical field [0001] The invention relates to the technical field of refrigeration equipment, in particular to an axial flow blade and an air conditioner outdoor unit using the axial flow blade. Background technique [0002] The axial fan blades used in existing air-conditioning outdoor units are usually composed of a hub and several blades. The blades are evenly distributed along the circumference of the hub, and the geometric shapes and aerodynamic parameters of the blades are consistent. During operation, the blades slap the air, thereby generating periodic pressure pulsations and forming broadband rotational noise. When several blades are evenly distributed along the circumference of the hub, and the geometric shapes, aerodynamic parameters and other data of several blades are consistent, several blades During high-speed rotation, the air will be periodically slapped, and the fundamental frequency of the resulting rotational noise is proportional to the number of blade...

AI Technical Summary

Problems solved by technology

[0002] The axial fan blades used in existing air-conditioning outdoor units are usually composed of a hub and several blades. The blades are evenly distributed along the circumference of the hub, and the geometric shapes and aerodynamic parameters of the blades are consistent. During operation, the blades slap the air, thereby generating periodic pressure pulsations and forming broadband rotational noise. When several blades are evenly distributed along the circumference of the hub, and the geometric shapes, aerodynamic parameters and other data of several blades are consistent, several blades During high-speed rotation, the air will be periodically slapped, and the fundamental frequency of the resulting rotational noise is proportional to the number of blades and the rotational speed. Therefore, the coincidence of the fundamental frequency of the rotational noise with the fixed frequency of the fan blades will cause beating vibrations, which will result in excessive rotational noise. superimposed, resulting in abnormal noise

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