Talk about the use of sealing ring on automobile wiring harness
Single Wire Seal Supplier shares that the durability and reliability of automobile parts have been paid more and more attention. As a protective material, rubber parts are widely used in automobiles. Among them, the importance of sealing ring is self-evident, especially for the wiring harness protection of engine nacelles and underchassis of automobiles. There is a “wet zone” here. In general, we call the “wet zone” where the engine compartment and the underbody of the car are exposed to the air and often affected by rain and water, and the “dry zone” where the cockpit and trunk are largely unaffected by rain.
One of the most important functions of wire harness seals is to separate wet and dry areas. This is an application. In addition, sealing rings should be installed at the ABS harness of left and right rear wheels. Specifically, under the rear seats (such as golf), there is a sealing ring to separate the inside and outside parts, so as to ensure that the water at the bottom will not leak into the cab during driving.
Every qualified wire harness will be tested by gas seal to ensure that the sealing ring on the wire harness can work. Generally, in the wire harness factory, we use vacuum test and detection equipment to carry out the work.
The working principle of the equipment is very simple, put the sealing ring on the mold, the equipment provides a continuous increase of pressure value, the inside of the air out, in a certain time and pressure value, if the sealing ring can withstand, is a good product, otherwise there will be quality problems, the specific operation is as follows.
In addition, electronic appliances and harness of the dry zone affected by the high temperature/humidity and chemical/dust is small, wet area is just on the contrary, if the seal bad, may lead to electrical appliances and wiring harness water, internal short circuit/corrosion caused by directly lead to function failure, which requires the wiring harness connector plug a complete sealing protection, for example, audi A3 in the project of the nacelle ESP – SG plug there are air tightness design, open the connector, you can see one layer of sealing ring (with oil), sealed performance is good or bad is directly related to its function is normal.
There are two main ways for electronic components such as connectors to enter water. The first is that external liquid penetrates into its interior by gravity, such as connectors without sealing ring, or water enters from internal connection points of wire harness (such as unprotected solder/pressure contact/lapping point). Emphasized the word “siphon” here, because it is a certain temperature when general electric in the work, the internal air to form a certain pressure, when to stop working, the temperature drop, the internal pressure is small, can form pressure difference at this moment, if the connector is sealed, the water vapor will be down much of the gap between copper wire inside, and lead to function failure; Therefore, the wet area connector will generally require a sealing ring (pad).
For connector sealing test, the general wiring harness manufacturers are integrated in the electronic test bench, the corresponding connector test module will bring sealing test, is to give it a rated pressure value, while testing its conductivity and sealing performance.
Summary, the sealing ring is the important parts of the wiring harness, its quality is directly related to the function of the wiring harness, either directly using in on the wiring harness connector, I have met the problem, the former see problem is surface holes or more, direct reason is the material to cut corners or mishandling the rubber in the vulcanization process; Connector is common internal seal ring assembly is not in place, the whole is not on a plane leading to air leakage; To find out the root cause of the problem as soon as possible and take precautions is what we wiring harness practitioners should consider.
That’s all for the sharing, thanks for your reading, and we also supply Automotive connector Single Wire Seal for sale, if you have any demand for our products, just feel free to contact us.
Yueqing Kinkong Electric Co., Ltd 