Air outlet protection hood of fan, fan and air conditioner outdoor machine

Abstract

The invention provides an air outlet protection hood of a fan, the fan and an air conditioner outdoor machine. The air outlet protection hood of the fan comprises a parallel circle ring and strip sheets which are arranged in the radial direction of the parallel circle ring. The curved segments of wing-shaped windward sides of the strip sheets are smooth curved segments, wherein each smooth curved segment is composed of at least one arc line segment. The included angle between the wing-shaped chord line of each strip sheet and the axis of a rotation shaft of the fan ranges from 0 to 23 degrees. According to the air outlet protection hood of the fan, the included angle between the wing-shaped chord line of each strip sheet and the axis of the rotation shaft of the fan ranges from 0 to 23 degrees, so that circumferential rotation flow generated by rotation of the fan is converted into axial flow to the maximum, the axial blowing-in effect of the fan is improved and meanwhile, high-temperature skipping stopping of an air conditioner is easily relieved. The curved segments of the wing-shaped windward sides of the strip sheets are designed to be smooth curved segments. Losses of dynamic pressure are easily reduced when the circumferential rotation flow of the fan is converted into the 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.

Images