High-performance axial-flow fan for extractor hood

Abstract

The invention provides a high-performance axial-flow fan for an extractor hood. The high-performance axial-flow fan comprises a housing and a centrifugal wind wheel which is mounted in the housing andis driven by a motor, wherein the centrifugal wind wheel at least consists of arc-shaped blades which are distributed in a radial direction, an air flue is formed between every two adjacent arc-shaped blades, and each air flue tilts towards an air exhaust hole of the fan from inside to outside. Through the inclined air flues, high-pressure air generated by the centrifugal wind wheel rebounds towards the air exhaust hole of the fan after colliding with the inner wall of the housing, and does not enter a centrifugal fan any more, so that turbulent flow between the outlet of each air flue of thecentrifugal wind wheel and the inner wall of the housing can be greatly reduced, and integral fluid power efficiency of the fan is improved, and therefore, motion wind resistance of the centrifugal fan is reduced; and the centrifugal fan can rotate at a high speed and can generate high-pressure air of 600 Pa or more, so that grease in oil fume can be condensed into small oil drops, and therefore,grease separating degree is improved.

Description

technical field [0001] The invention relates to a fan of a range hood. Background technique [0002] The range hood is a more commonly used household appliance in the kitchen. Among them, the core component is the fan, which generates negative pressure during high-speed rotation, sucks the oil fume into the fan, and at the same time throws the oil fume to the inner wall of the fan at high speed, so that the grease in the oil fume is separated, and the gas part passes through the range hood. The air duct discharges to the outside. In order to improve the separation degree of grease in the oil fume, it is necessary to increase the fan speed to generate high wind pressure. At present, the fan of the range hood generally adopts a planar wind wheel structure, and the inner wall of the fan and the wind direction generated by the rotation of the wind wheel are perpendicular to each other. This design is that the high-pressure wind flow generated by the wind rotor will generate a ...

AI Technical Summary

Problems solved by technology

In order to improve the separation degree of grease in the oil fume, it is necessary to increase the fan speed to generate high wind pressure. At present, the fan of the range hood generally adopts a planar wind wheel structure, and the inner wall of the fan and the wind direction generated by the rotation of the wind wheel are perpendicular to each other. This design is that the high-pressure wind flow generated by the wind rotor will generate a large turbulence between the wind rotor and the inner wall, and the turbulence will cause a large wind resistance to the wind rotor, which will affect the speed of the wind rotor, thereby reducing the wind generated by it. wind pressure

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