The siphon phenomenon refers to the phenomenon that the liquid flows through the higher liquid level through the curved tube under the action of intermolecular attraction and atmospheric pressure, and then flows down into the lower liquid level, as shown in Figure 1. In automobiles, when the electrical module is working, the temperature inside increases, and when the temperature is stopped, the internal pressure decreases. At this time, under the action of the pressure difference, water molecules penetrate into the electrical module through the gap of the poorly sealed multi-strand wires. , causing electrical failure.
For the first case, it is generally required in the industry: ● The electrical module housing is integrally formed, using sealing gaskets, sealants, etc. for waterproofing; ● The connectors are waterproof with sealing plugs, sealing plugs, and blind plugs; ● Electrical modules The installation should be higher than the corresponding ground point, and the ground wire harness direction is downward, and the water seepage problem caused by the gravity of the water itself can be effectively solved through the optimization of the installation position.