IMPELLER AND CENTRIFUGAL FAN INCLUDING THE SAME

An impeller includes a hub, an extension disc connected to the hub, and blades disposed annularly around the hub. Each blade has a bottom edge connected to the extension disc. An air guiding cover is connected to top edges of the blades and includes an air inlet edge encircling and delimiting an air inlet. Air outlets are formed between an air outlet edge of the air guiding cover and an outer edge of the extension disc and are separated from each other by the blades. The air guiding cover includes an inner face having grooves. Each two adjacent blades have at least one groove therebetween. Each groove has a widt decreasing from the respective air outlet towards the air inlet. 本发明提供一种离心扇轮及具有该离心扇轮的离心风扇，用以解决现有离心风扇运作噪音不易再降低的问题。该离心扇轮包括：一轮毂；一延伸盘，连接该轮毂；多个扇叶，环设于该轮毂的外周，多个扇叶的底缘连接该延伸盘；及一导风盖，连接多个扇叶的顶缘，该导风盖的入风缘圈围形成一入风口，该导风盖的出风缘与该延伸盘的外缘之间由多个扇叶分隔出多个出风口，该导风盖的内表面在任两个相邻扇叶之间都具有至少一凹槽，该凹槽由该出风口往该入风口延伸，且该凹槽的槽宽由该出风口往该入风口递减。