How can a harness prevent siphoning from creating water ingress problems?

In harness waterproofing, how to deal with the siphon phenomenon is a basic skill for harness engineers. First, what is siphon phenomenon? "Siphon phenomenon" refers to the phenomenon of liquid flow due to the action of atmospheric pressure and the difference of height. The liquid can be removed from the container by using a hose without moving the container or other tools. This also has applications in today's life, such as fish tanks, water tanks and so on. Siphon is a fluid physics phenomenon that draws liquid without the need for a pump. The liquid at a high position fills the inverted U-shaped tubular structure (called a siphon), and the opening is at a lower position. In this configuration, the liquid pressure differential at the pipe junction can be pushed through the highest point and released to the other end. 2. How to avoid siphoning? ① Waterproof sheath: the waterproof sheath of the electrical module is installed above the grounding point. The waterproof sleeve of the electrical module is installed above the grounding point. ② Insulation sealing: In order to prevent water ingress caused by siphon, insulation sealing shall be carried out at the wiring point and bonding point in the wet area to avoid water ingress caused by siphon. The most economical and effective method is to use double-wall heat-shrinkable tube for insulation sealing. In order to prevent water ingress caused by siphon, the wiring point and grounding point in the wet area shall be insulated and sealed to avoid water ingress caused by siphon. The most economical and effective method is to use double-wall heat-shrinkable tube for insulation and sealing. ③ Double-wall heat-shrinkable tube: when the harness absorbs water, the double-wall heat-shrinkable tube is an important seal to prevent the harness from entering water. The common double-wall heat-shrinkable tube is used at two points, namely, the heat-shrinkable grounding point and the heat-shrinkable wiring point. When the harness absorbs water, the double-wall heat-shrinkable tube is an important seal to prevent the harness from entering water. The common double-wall heat-shrinkable tube can be used at two points: the heat-shrinkable grounding point and the heat-shrinkable wiring point. 3. What is the double-wall heat-shrinkable tube? The double-wall heat-shrinkable tube is a type of heat-shrinkable tube, the outer layer is made of high-quality and soft cross-linked polyolefin materials, and the inner layer is made of hot melt adhesive. The outer material has the advantages of insulation, corrosion resistance and good wear resistance, and the inner layer has the advantages of low melting point, water resistance, sealing, high adhesion and the like. The double-wall heat-shrinkable sleeve is widely used for waterproof and leakage-proof wiring of electronic equipment, anticorrosive protection of wire branches, repair of wires and cables, and waterproof wiring of water pumps and submersible electric pumps.

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