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内燃机运转时,与高温燃气相接触的零件强烈受热,如果得不到适当的冷却会使内燃机过热,导致充气系数下降,燃烧不正常(爆燃、早燃等),机油变质和烧损,零件的摩擦和磨损加剧。使内燃机的动力性、经济性、可靠性和耐久性全面恶化。在起重机、装载机、推土机、汽车等施工机械中,发动机温度过高的故障时有发生。某施工单位有一台解放牌汽车吊,进厂大修时发动机温度正常,大修后,每当运行10分钟左右,冷却水总是“开锅”,致使该车迟迟不能出厂。汽车在使用过程中,冷却系统发生故障
During operation of the internal combustion engine, parts that come into contact with high-temperature combustion gases are strongly heated. If proper cooling is not obtained, the internal combustion engine will overheat, resulting in a decrease in the air-intake coefficient, an abnormal combustion (deflagration, premature combustion, etc.), deterioration and burn-in of engine oil, and the Friction and wear increase. The overall deterioration of the engine’s power, economy, reliability and durability. In construction machines such as cranes, loaders, bulldozers, and automobiles, engine temperature overshoots occur at times. A construction company has a liberated brand automobile crane. When the engine is overhauled, the temperature of the engine is normal. After the overhaul, the cooling water is always “opened” whenever it is run for about 10 minutes, causing the car to be delayed. The cooling system malfunctions during the use of the car