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风扇系发动机冷却系统主要部件之一。风冷发动机直接采用空气作为冷却介质,并采用风扇使高速气流吹过散热表面,带走散出的热量进行强制冷却;水冷发动机以散热器散发热量,借助风扇强制通风进行冷却。一、风扇的结构形式与特点 1.轴流风扇用厚度为1～2mm钢板冲制而成,制造容易,叶片一般为4～6个,已用在功率为514.7kW的发动机中,是目前使用最多的风扇。有:(1)多叶高速式,各叶片夹角不等,能减少噪声;(2)叶片前端弯曲式,在相同结构参数下,可使风量、效率、噪声得到改善;(3)用塑料注塑或铝合金制造,其叶片形状合理、效率高,但工艺较复杂。
The fan is one of the main components of the engine cooling system. Air-cooled engines directly use air as the cooling medium, and use fans to blow high-speed air over the heat-dissipating surface, taking away the heat that has been dissipated for forced cooling. The water-cooled engine uses heat sinks to dissipate heat and is forced to cool with the aid of fans. First, the structure and characteristics of the fan 1. Axial fan with a thickness of 1 ~ 2mm punched steel plate, easy to manufacture, the blade is generally 4 to 6, has been used in the engine power of 514.7kW, is currently used Most fans. There are: (1) Multi-leaf high-speed type, with different blade angles, which can reduce noise; (2) Blade front-end bending type, which can improve wind volume, efficiency and noise under the same structural parameters; (3) use plastic Injection molding or aluminum alloy manufacturing, the blade shape is reasonable, high efficiency, but the process is more complex.