Plastic fuel tank for car[汽车知识]

CarBurnFuel tankIt is the only place on the car to store fuel, and it is an important functional and safety component on the car. It must be firm and sealed. Traditional fuel tanks are made of metal. With the increasing application of plastics in vehicles, a plastic fuel tank is gradually replacing metal fuel tanks. The prerequisite for the application of plastic fuel tanks is that it must have the performance of a metal fuel tank, at least it must have impact resistance, non-leakage and flame retardant effects, and at the same time it must have better performance than metal fuel tanks in order to make people believe in plastics. The superiority of the fuel tank, discard the old and re-use the plastic fuel tank. The most obvious benefits of plastic fuel tanks are: One is light weight. When the engine power is constant, the lighter the weight of the car, the greater the effective carrying capacity. Therefore, designers start from the premise of saving fuel, and do everything possible to reduce the weight of the car and improve the economy of the car. Since the relative density of plastic is only about 1/7 of that of metal, the weight can be reduced by about 1/3 to half compared with a metal fuel tank of the same volume. The second is casual style. The appearance of modern cars is becoming more and more compact, and there are more and more configurations on the car. Therefore, making full use of the available space on the car is an effective way to increase the utilization rate of the car. Because the manufacturing process of plastic fuel tanks is different from that of metal fuel tanks, one-time blow molding can be used to make special-shaped fuel tanks with complex shapes. Therefore, when the overall layout of the car has been determined, the shape of the fuel tank can be adapted to the space position, and the remaining space of the chassis can be fully utilized to expand the volume of the fuel tank, increase the storage capacity of fuel, and increase the mileage of the car. The third is that it will not explode. Metal fuel tanks are prone to explosion in the event of a fire, which is dangerous. Since the plastic fuel tank is made of high molecular weight polyethylene (HmwhdPE) material, the thermal conductivity is very low, only 1% of the metal. At the same time, high molecular weight polyethylene is elastic and rigid. It still has excellent impact resistance and mechanical properties under the environment of minus 40 degrees Celsius to minus 60 degrees Celsius. Sparks are not easy to occur when impact and friction occur. Even if the car accidentally catches fire, it will not explode due to the thermal expansion of the plastic fuel tank, and the passengers in the car have sufficient time to transfer. Other advantages include low fuel leakage. In an environment of 40 degrees Celsius, the average fuel leakage does not exceed 20 grams per day. If a plastic fuel tank with a multilayer composite structure is used, the average fuel leakage is less than 2 grams per day. Due to the high stability of high molecular weight polyethylene, the service life of the plastic fuel tank can be up to 10 years, and it is corrosion resistant. The plastic fuel tank is not afraid of corrosion by substances such as salt and alkali. Especially in the severe cold in winter, some places like to sprinkle salt on the road to prevent icing. Metal fuel tanks are easily corroded when cars pass by, but plastic fuel tanks do not have this problem. Plastic fuel tank materials generally use high molecular weight polyethylene as the base material, supplemented by bonding or barrier materials, and blow molded plastic fuel tanks with single-layer and multi-layer composite structures. The molding process of the multi-layer composite plastic fuel tank is more complicated, requiring a dedicated blow molding machine, but the fuel tank is of good quality. Compared with metal fuel tanks, the production of plastic fuel tanks has the advantages of simple process, high efficiency and short production cycle. Manufacturing metal fuel tanks requires cutting, stamping, welding, painting and other processes, while plastic fuel tanks including accessories can be formed at one time to achieve the integration of main accessories, and the cost can be reduced by 1/3. Che Huitong Related: ·Conservation experts say the waste of car maintenance[汽车修理知识]
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