烟腔无电机叶轮的空气放大式抽油烟机之机理

The mechanism of an air-amplifier-style ventilator with no motor rotor in its smoke cavity

标准空气放大器制成的烟腔无电机叶轮抽油烟机,虽能克服现有抽油烟机烟腔内的电机叶轮吸油结垢之缺陷和甩出油垢之弊端,但空气放大器本体的气隙易受油垢堵塞,而在本体增开油槽和油孔,即能自防气隙堵塞。该抽油烟机涉及附壁效应,而附壁效应在此的正解是:输入的压缩空气从气隙冲向本体的气腔上端乃至上方,形成空心状负压区,能强烈抽吸本体底端下方的油烟,形成实心气柱,从而实现抽吸油烟量远大于压缩空气输入量。

A ventilator with motor-rotorless cavity, forced by a standard air amplifier, nevertheless within the smoke cavity able to overcome both the defect that the motor toter covers oily while sucking and the disadvantage that oil dirt is splashed out, is however easy to get obstruction in the air gap of the amplifier. Since gutters and holes are added for oil discharge, the air amplifier itself is able to avoid obstruction. This ventilator refers to Coanda Effect which in this context shall be interpreted as： the inputting compressed air dashes from air gap to the amplifier itselves＇ upper Dart or even the overtopped part. There forms a hollow negative pressure that can strongly suck in the oily smoke below the bottom of the amplifier and builds a solid air column. As a result, that the oily smoke sucks much more considerable than the high-pressured air inputs is realized.