| 摘要 |
A variable cooling fan is provided to increase flow rate when the temperature of a coolant rises and reduce noise caused due to the rotation of the cooling fan when the temperature of the coolant falls. A variable cooling fan(100) includes a main blade(300), a first actuator, and a first auxiliary blade(400). The main blade is arranged on an outer surface of a housing(200) of the cooling fan, and has a first space formed therein and a first slot formed at an outer end of the first space. The first actuator is made of a shape memory alloy positioned in the first space. The first auxiliary blade has one end contacting the first actuator and the other end protruded to the first slot. The shape of the first actuator varies in accordance with the variation of temperature around the cooling fan such that the first auxiliary blade is extensible outwardly from the first slot. |
