Axial flow fan blade, axial flow fan and air conditioner

Abstract

The invention provides an axial flow fan blade, an axial flow fan and an air conditioner. The axial flow fan blade comprises a plurality of blades and a hub, the plurality of blades are arranged at intervals in the circumferential direction of the hub, each blade comprises a front edge, an outer edge, a rear edge and an inner edge, and each rear edge comprises a connecting line AB, a connecting line BE, a connecting line EC and a connecting line CD which are sequentially connected end to end. A plane passing through the rotating axis of the blade is set as a first plane, and the blade is circumferentially projected to the first plane in the rotating direction of the blade to form a first contour line. On the first contour line, a point A, a point B and a point C are located on a same straight line L1, and the included angle theta 1 is formed between the straight line L1 and the rotating axis of the blade and is larger than or equal to 75 degrees and smaller than or equal to 120 degrees; and the projection of the connecting line EC is a line segment, the line segment is located on a straight line L2, and the included angle between L2 and L1 is theta 2, and theta 2 is larger than 0 degree and smaller than or equal to 30 degrees. According to the axial flow fan blade, turbulence of the tail edge of the axial flow fan blade can be improved and reduced, aerodynamic noise of the fanblade can be reduced, and the efficiency of the fan can be improved.

Description

technical field [0001] The present application relates to the technical field of air conditioning, and in particular to an axial fan blade, an axial fan and an air conditioner. Background technique [0002] Axial-flow fan blades are widely used in air-conditioning products due to their large air volume and low noise. The working efficiency of axial-flow fan blades and air ducts in air-conditioning has an important impact on the energy efficiency and comfort of air-conditioning capabilities. The low air volume of the fan blades will make the heat transfer on the heat exchanger side of the air conditioner worse, reduce the heat transfer capacity of the air conditioner, and cause the system power on the refrigerant side to increase; energy consumption. Therefore, the air volume and efficiency of the axial flow fan blades and air ducts in the air conditioner have a significant impact on the performance of the air conditioner. [0003] Generally, when the axial-flow fan blade i...

AI Technical Summary

Problems solved by technology

Due to the centrifugal force of the rotation, the pressure gradient change in the radial direction, and the influence of the flow guide structure in the air duct, the airflow flows radially inward or radially outward. The radial air flow is disturbed, which affects the efficiency of the fan. The turbulence generated by this disturbance is relatively large, which is prone to noise and affects comfort.

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