The durability and reliability of automotive parts are increasingly valued. As a protective material, rubber parts are widely used in automobiles. The importance of the seals is self-evident, especially for harness protection of the engine compartment and the lower chassis of the car. Because usually the two places are in a harsh environment with a high probability. There is a concept of “wet zone†to know. In general, we expose the engine compartment and the lower part of the car to the air. The area that is often affected by rain and water is called the “wet zoneâ€, corresponding to the cockpit and baggage. The box and other parts are basically not affected by rain. This part is called the “dry areaâ€.
One of the biggest functions of the wire harness seal is to isolate the wet zone and the dry zone. This is an application. The common part is to install one between the engine compartment and the cockpit to separate the dry zone from the wet zone. The rear wheel ABS harness needs to be equipped with a sealing ring, specifically under the rear seat (such as golf). There is a sealing ring separating the inner and outer parts to ensure that the water at the bottom does not leak into the cab during driving.
Each qualified wire harness is air-sealed to ensure that the seal on the wire harness can function. In the wire harness factory, we use vacuum test equipment to work.
The working principle of the equipment is very simple. The sealing ring is placed on the mold. The equipment provides a continuously increasing pressure value, and the inside air is pumped out. Within a certain time and pressure value, if the sealing ring can withstand, it is a good product. On the contrary, there are quality problems. The specific operations are as follows:
In addition, the electrical appliances and wiring harnesses in the dry zone are less affected by high temperature/high humidity and chemicals/dust. The wet zone is just the opposite. If the sealing is poor, the electrical appliances and wiring harness may enter the water, causing internal circuit short circuit/corrosion, etc. This leads to functional failure, which requires the connector connector of the harness to be sealed. For example, the ESP-SG plug of the engine compartment in the Audi A3 project has a hermetic design. Open the connector and you can see one of them. The sealing ring (with oil), its sealing performance is directly related to whether the function is normal.
There are two main ways for the electronic components such as connectors to enter the water. The first is that the external liquid penetrates into the interior by gravity, such as a connector without a seal ring, or moisture from the internal connection point of the wire harness (such as unprotected solder joints). / crimp point / ground point) enter; here emphasizes the word "siphon", because the general electrical appliance has a certain temperature during work, the internal air forms a certain pressure, when the work stops, the temperature drops, the internal pressure is also small, this When the connector is poorly sealed, the water vapor will enter the inside along the gap between the multiple strands of copper wire, resulting in functional failure; therefore, the connector in the wet zone generally requires a sealing ring (pad).
For the sealing test of the connector, the general wire harness manufacturer is integrated in the electronic test bench, and the test module of the corresponding connector will have its own sealing test, which is also given a rated pressure value, while testing its continuity. Test sealing performance.
In summary, the sealing ring is a very important component on the wire harness, and its quality is directly related to the function of the wire harness. I have encountered problems whether it is directly on the wire harness or in the connector. The former is more common and the surface is vulnerable. Or, the direct reason is that the material is cut and the rubber or the rubber is not properly handled in the vulcanization process; the connector is usually that the inner seal is not in place, and the whole does not leak on a plane; find the root cause of the problem as soon as possible, and do a good job. Precautionary measures should be considered by our wire harness practitioners.
Our wire and cable requires for product quality certification documents from the supplier, The wiring shall have the factory quality certificate documents, including: certificate of quality (the certificate has the production license number and the "CCC" certification mark), test report and the "CCC" certification certificate; he quality certificate of electric wire shall be the original, if it is a copy, the copy shall be consistent with the original content, with the official seal of the original storage unit affixed, indicating the place where the original is stored, and the signature and time of the handler; The manufacturer shall have the business license of enterprise legal person.
Automotive Wire Connectors,Waterproof Wire Connectors,Wire Connectors,Wire Harness Connectors
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