简述汽车空调系统内平衡式膨胀阀的作用及工作原理?

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使用及工作原理: 当蒸发器出口温度增加, 感温包即可感知包内和毛细管内的气体膨胀,推动膨胀阀中的膜片向下移动,推动推力杆、球阀克服弹簧压力,打开阀门,使制冷剂流量增加,离开蒸发器的制冷剂流量增加时,其温度下降,感温包感知后,内部气体膜片上的压力减小,使阀门关闭。

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