作者：西山云舞

这台洗车机2020年7月份买的。

但是今天他居然出故障了。本来水枪一关，马达会自动停，现在是水枪关了完了还是继续转，导致水压过高，喷枪开关都很难按下去。

卸下外壳顶部的4颗螺丝，拆开外壳。

机身中部的连接线。平时使用的时候水是淋不到的。右边的白色圆柱体是单相异步电机的相移电容。

泵头上有一个压力开关，判断就是这个开关的问题，导致了无法停泵。

拆下压力开关，中间有一个圆孔。

分解外壳，里面是一个微动开关和一个尼龙滑块。

泵头上面的压力感应阀的黄铜柱，插到压力开关的孔里面，推动尼龙滑块，控制微动开关的通断。压力感应阀的压力腔里面布满了铝合金泵壳的氧化物。

正常状态下，应该是喷枪关闭后，泵出口压力上升，压力感应阀的黄铜杆下降，微动开关断开电动机。但实际上，黄铜杆没有下降。

拆开泵头看能不能把压力阀拆下来寻找问题。下面是柱塞泵的斜盘，泡在机油里。

柱塞泵的推动柱。这边密封良好，没有任何生锈。

柱塞泵的泵腔。里面跟水接触的通路已经有明显的锈蚀。我用的都是清水。不过在两年时间里面，没有特意去清干净蹦里面的水。

咨询了官方，有可能是出口保压阀的问题。给了个维修视频。要拆开这个内卡簧，需要买一个卡簧钳。

天猫买了个最便宜的。

收到之后轻松拆下卡簧。

质量还行。

保压阀拆下来之后，没有任何问题。

最后判断应该不是结构损坏，而是长时间不用，铝合金泵体锈蚀，脱落的氧化物卡在黄铜板的摩擦面，摩擦力增大导致动作不灵活。由于无法拆下黄铜杆，只能反复按动黄铜杆数十下，复装后恢复正常。

这类铝合金泵体的洗车机，应该每次用完之后，都把水排干，应该能延长寿命。

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