Abstract: This disclosure provides an internal circulation heat dissipation fan having a stator and an impeller. The impeller has a hub and multiple fan blades arranged around the hub, the hub having an inner shell and an outer shell sheathing the inner shell, the stator is accommodated in the inner shell, an internal flow channel is defined between the inner shell and the outer shell, the internal flow channel has a side communicated to a space in the inner shell and another side communicated to outside of the outer shell, multiple heat dissipation blades are arranged in the internal flow channel and annually disposed. Each heat dissipation blade has two opposite edges respectively connected to the inner shell and the outer shell.

Abstract: A fan module is provided, including a hub, a plurality of blades connected to the hub, and a plurality of longitudinal members. Each of the blades includes a base side connected to the hub, an end side opposite to the base side, a windward side, a leeward side opposite to the windward side, a windward surface, and a leeward surface opposite to the windward surface. The windward and leeward sides are connected to the base side and the end side. Each of the longitudinal members is disposed on the leeward surface of each of the blades, connected to the end side, and has a first end, a second end, and a tapered structure. The first and second ends face the leeward and windward sides respectively. The height of the first end is the maximum height of the longitudinal member. The tapered structure is connected to the second end.

Abstract: A fan module is provided, including a hub, a plurality of blades connected to the hub, and a plurality of longitudinal members. Each of the blades includes a base side connected to the hub, an end side opposite to the base side, a windward side, a leeward side opposite to the windward side, a windward surface, and a leeward surface opposite to the windward surface. The windward and leeward sides are connected to the base side and the end side. Each of the longitudinal members is disposed on the leeward surface of each of the blades, connected to the end side, and has a first end, a second end, and a tapered structure. The first and second ends face the leeward and windward sides respectively. The height of the first end is the maximum height of the longitudinal member. The tapered structure is connected to the second end.