Outlet protective cover of fan, outdoor unit of fan and air conditioner

Abstract

The invention provides an air outlet protection cover of a fan, a fan and an outdoor unit of an air conditioner. The wind outlet protective cover of the fan includes a weft ring and warp strips arranged radially along the weft ring, and the curved section on the windward side of the warp strip airfoil is a smooth curved section composed of at least one arc line segment, and The included angle between the chord line of the sliver airfoil and the axis of the rotating shaft of the fan is 0°-23°. In the air outlet protective cover of the fan provided by the present invention, the included angle between the chord line of the airfoil and the axis of the fan's rotating shaft is 0° to 23°, so as to maximize the circumferential rotating flow generated by the fan rotation. Converting to axial flow improves the axial air supply effect of the fan; at the same time, it helps to reduce the high-temperature trip phenomenon of the air conditioner; by designing the curve section on the windward side of the warp airfoil into a smooth curve section, it is beneficial to reduce The dynamic pressure loss when the fan's circumferential rotating flow is converted to axial flow.

Description

technical field [0001] The present invention relates to the field of electric appliances, and more specifically, relates to an air outlet protective cover of a fan, a fan including the air outlet protective cover, and an outdoor unit of an air conditioner including the fan. Background technique [0002] At present, the fan used for the outdoor unit of the air conditioner is generally a propeller fan, and the propeller fan is equipped with blades on the outer periphery of the hub, and can use the lift generated by the rotation of the blades to send air. At this time, compared with the vicinity of the hub on the blowing side, the spiral flow generated on the outer peripheral side of the blowing side of the propeller fan in the same direction as the fan rotation increases. If the spiral flow cannot be converted into the axial flow of the fan, that is, the axial flow , the dynamic pressure energy is lost, and the aerodynamic performance of the propeller fan is reduced. At the sa...

AI Technical Summary

Problems solved by technology

[0005] In the first method, since there are no concentric strips in the safety protection grille, in order to prevent foreign matter from entering the propeller fan from the outside, many radially extending strips are required, and the safety protection grille is designed However, due to the dense design of the safety protection grille, the rotating flow from the propeller fan will lose a lot of dynamic pressure when passing through the safety protection grille

[0006] In the second method, the safety protection grille is in a lattice shape composed of concentric strips and radially extending strips, but the lattice strips extend downstream parallel to the direction of the rotation axis of the propeller fan, Therefore, the swirling flow cannot be turned in the direction of the rotary axis, resulting in loss of dynamic pressure energy and degradation of aerodynamic performance.

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