Air conditioners, axial fans and their axial fans

Abstract

The invention provides an axial propeller which comprises a hub and blades. The tail edges of the blades are bent towards the front edges of the blades in a mode of being perpendicular to a projection contour line of the axis plane of the hub. Each blade comprises a first curve ab and a second curve bc, wherein the intersection point of the two curves is the point farthest from the connection line ac; the connection line ac is the connection line of the first end point a and the second end point c; the center of the hub serves as the circle center o, the diameter of a located circle passing any point on the projection contour line serves as d, the arc length, cut by the connection line ac and the first curve ab or the second curve bc, of the located circle serves as the concavity depth delta, the concavity depth delta which passes the first curve ab increases along with increasing of d, the concavity depth delta which passes the second curve bc decreases along with increasing of the d, delta divided by d makes epsilon, and epsilon is larger than or equal to zero but smaller than or equal to 0.2. As the effect of improving flowing of air flow at the tail edges of the blades can be achieved within the variation range, air feeding noise of the axial propeller is lowered, resistance to the blades from the air flow can be reduced, and power dissipation of an axial fan can be reduced. The invention further provides the axial fan comprising the axial propeller, and an air conditioner.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to an air conditioner, an axial flow fan and axial flow blades thereof. Background technique [0002] With the continuous development of economic construction, air-conditioning technology has also made significant progress. Most of the outdoor units of air conditioners use axial flow fans for heat dissipation, and axial flow fans, as an important part of air conditioners, rely on their high-speed rotation to make the gas flow directionally under the action of the blades to produce heat dissipation. [0003] Please refer to figure 1 , figure 1 It is a structural schematic diagram of an axial-flow fan blade in the prior art. [0004] At present, its basic structure includes a hub and two or more blades 02 arranged on the hub 01 at equal or unequal intervals. The blade trailing edge of the blade 02 of the axial flow fan blade is mostly flat, convex or large concave shape, ...

AI Technical Summary

Problems solved by technology

The blade trailing edge of the blade 02 of the axial flow fan blade is mostly flat, convex or large concave shape, and when working, the blade 02 of the blade trailing edge of this type of blade vibrates due to high-speed rotation and air flow, thereby producing relatively large Large noise, at the same time, due to the effect of air flow, it will generate certain resistance to the rotation of the blades, which will increase the power consumption of the rotation of the blades 02, so that the axial flow fan needs higher rotation power to meet the needs of air output and heat dissipation

Images