Fan

The invention relates to a fan. The fan comprises a fan frame, an impeller and a supporting piece. The fan frame comprises a bottom plate and a cover plate spaced from the bottom plate, the bottom plate and the cover plate jointly define a first containing space, an air inlet is formed in the axial position of the cover plate, and at least one air outlet is formed in the side edge of the fan frame; the impeller is arranged in the first accommodating space and comprises a hub and fan blades; the sectional area of the hub is gradually increased in the direction from the cover plate to the bottom plate to form a cone shape, the fan blades are annularly arranged on the outer periphery of the hub, the supporting piece is arranged between the bottom plate and the cover plate and used for supporting the cover plate, and the thickness of the section of each fan blade of the impeller is uneven. 本发明涉及风扇。所述风扇包括扇框、叶轮、及支撑件；扇框包括底板以及与底板相间隔的盖板，底板与盖板共同限定出第一容置空间，盖板于轴向位置上设置有入风口，扇框的侧边设置有至少一出风口；叶轮设置于第一容置空间内，并包括轮毂以及扇叶；轮毂的截面积自盖板往底板