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Chinese The water pump is an important part of the engine cooling system. Its function is to pump the coolant, so that the coolant flows rapidly in the cooling water channel of the engine, so as to take away the heat generated when the engine is working and maintain the normal working temperature of the engine. The pumping volume of the water pump is very large. For example, the pumping volume of a V8 engine is about 750 L/h at idle speed.
Classification of water pumps:
According to the different driving methods, water pumps are generally divided into mechanical water pumps and electric water pumps. At present, most engines use mechanical water pumps, and electric water pumps have been used in some newly developed engines with high technical content, such as those of the BMW 6 series (E63).
1. Mechanical water pump The mechanical water pump is driven by the engine crankshaft through the transmission belt, and its speed is proportional to the speed of the engine. There are advantages and disadvantages to the way a mechanical water pump works. When the engine works under high-speed and high-load conditions, the engine generates a lot of heat, and the high speed of the water pump increases the circulating flow of the coolant, which can just improve the cooling capacity of the engine; when the engine works under low-speed and high-load conditions When towing other vehicles or turning on the air conditioner, at this time, the low speed of the engine causes the speed of the water pump to be low, which reduces the cooling capacity of the engine.
2. Electric water pump The electric water pump is controlled by the engine control unit through current, it is not affected by the engine speed at that time, and can work flexibly according to the actual cooling needs of the engine. Since the engine power consumed by the electric water pump is very small, the fuel consumption of the engine can be reduced by using the electric water pump.
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