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冬季,车用柴油发动机起动比较困难。主要原因是进入发动机的空气温度比较低,压缩后的气体达不到着火温度。为保证柴油发动机冷起动迅速可靠,常采用预热装置对进入气缸的空气进行预热。汽车上最常用的是电热塞式预热装置,电热塞的发热体中装有由镍铬丝合金制成的加热线圈,四周填充有耐热及传热性好的氧化镁绝缘物。这种预热装置具有耐热、耐腐蚀、发热量大等优点,应用最为广泛。 电热塞通过外壳的螺纹拧在气缸盖上,电热塞数目
Winter, diesel engine starting more difficult. The main reason is that the temperature of the air entering the engine is relatively low and the compressed gas can not reach the ignition temperature. In order to ensure the diesel engine cold starting quickly and reliably, often using preheating device to preheat the air entering the cylinder. The most commonly used car is the glow plug preheating device, glow plug heating element is equipped with a heating coil made of nichrome wire alloy, surrounded by a good heat and heat transfer of magnesium oxide insulation. This preheating device has the advantages of heat resistance, corrosion resistance, heat and so on, the most widely used. Glow plugs through the shell thread screwed on the cylinder head, the number of glow plugs