What are the causes of car fire in hot weather?

First, the hidden dangers of inferior modification

In the spontaneous combustion accident caused by line fault, the main reason is "grounding". This phenomenon is mainly due to line aging, overload, short circuit, poor contact or wear "grounding", which will produce very large heat. If the wire quality is not good enough, or there are many inflammable and explosive materials around, it is easy to cause fire and spontaneous combustion accidents. For example, the skin between cable, frame and clip is broken due to vibration and friction; Taillight, brake light wire, etc. Damage due to vibration and friction; When the insulator at the lamp holder installation is loose or damaged due to vibration and connector damage, it will automatically "ground" for a long time when the vehicle is driving or stopping, resulting in high temperature, which will damage the insulation of electrical appliances, switches and wires, further expand the flashover range and expand the high-temperature area, and finally lead to spontaneous combustion fire due to contact with paint, leaked gasoline, flammable materials, etc.

2. Short circuit of wires and appliances

The most common electrical short circuit of wire is that the starter switch is welded due to contact sintering, and the starter magnetic switch cannot be released, which leads to the starter starting time being too long (the safe starting time of the starter is 5s), which leads to the starter heating and fire. In addition, in some single-track vehicles, the insulation of the live wire is damaged "grounding" or the electrical equipment is "grounding", which will cause short circuit, especially in some vehicles that have been used for a long time, and the lines are worn and disordered. The "protector" of the wires in the car is the fuse. Once the wire is short-circuited, a large current will be generated instantly, and the fuse will blow quickly. However, if the fuse is too big, for example, someone tries to replace the standard fuse with copper wire, resulting in the loss of protection function, which may lead to short circuit of the wire and fire.

3. Improper parking position

Because the cars produced at present are generally equipped with three-way catalytic reactors, and the temperature of this device located on the exhaust pipe is very high, generally between 300℃ and 400℃. Once there is combustible under the car at this time, it is easy to be ignited by the three-way catalytic device, which leads to the car's fire and spontaneous combustion.

4. Put dangerous goods in the car

In fact, dangerous goods are not only large tankers, but also lighters, perfumes and mousses in our daily life. If we put these items in the parts of the car that are easily focused by the sun's rays, there is also a certain fire hazard. Therefore, when locking the car, check the inside of the car, don't put these dangerous goods around, and don't put dangerous oil products such as gasoline and diesel.

Verb (abbreviation for verb) leaks electricity.

When the engine is working, the ignition coil temperature is very high, which leads to the softening, aging and cracking of the insulation layer of the high voltage ignition wire. Ignition high-voltage electricity is easy to break through the insulation layer, and it is easy to produce high-voltage electricity leakage, which will lead to the rising temperature of the leakage place, ignite the leaked gasoline such as engine and carburetor, and lead to ignition and combustion.

In addition to the above reasons, there are actually oil leakage, long-distance driving in hot weather, excessive contact resistance and so on.