When people choose a charging gun, they first consider safety, and the most important one in safety is its airtightness.The air-tight charging gun can be charged even on rainy days.In order to ensure the safety of people using charging guns, the state stipulates that the highest dustproof and waterproof level of charging guns must reach IP68.Therefore, manufacturers will conduct air tightness testing for new energy vehicle charging guns during production.Hirays Technology has also conducted in-depth research on the air tightness testing of charging guns and achieved remarkable results.
So, this time we will share a case of air tightness testing of a new energy vehicle charging gun for your reference:
1. Appearance of new energy vehicle charging gun and display of detection difficulties
1. The charging gun has an irregular shape. In order to ensure the convenience of consumers, there is a special handle on the charging gun.
2. In order to ensure the sealing of the charging gun, the manufacturer uses special waterproof materials to wrap it without obvious joint gaps. This structure is not conducive to direct detection and cannot be used to judge the air tightness of the charging gun through the gas leakage value.
2. Breakthrough in detection difficulties of new energy charging guns and demonstration of the detection process
1. Due to the special structure of the charging gun, Hirays Technology customized a mold tooling according to the shape of the charging gun. It can snap the connectors on both sides of the charging gun into the mold. In order to better fix the connectors at the two ends of the wire, a groove is specially made so that the upper and lower parts of the mold can be better sealed when closed.
2. Put the charging gun into the tooling mold and connect it to our instrument. There is a valve island, gas tank and other components inside the instrument as well as the program we have set. After the connection is made, press the start button when testing the wire.At this time, the upper and lower molds begin to close, and clean gas without impurities is filled into the mold. The instrument display screen will judge the sealing degree of the charging gun based on the gas saturation inside the mold.
Charging gun air tightness testing tooling plan Figure 1
Charging gun air tightness testing tooling plan Figure 2
3. If the car charging gun is not sealed and air leakage occurs, the leakage value displayed in the instrument will become larger and larger, and the pressure value will decrease at the same time.At this time, it can be determined whether the car charging gun is leaking, and the instrument test result will also show NG, which means the air tightness test failed.If the tested car charging gun does not leak, the gas in the tooling mold will be in a constant state after inflation. The pressure value and leakage value displayed on the instrument are also stable. The instrument test result will display OK, indicating that the air tightness test has passed.
Charging gun customer factory on-site debugging and inspection diagram
3. New energy vehicle charging gun detector parameter table
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