Internal combustion engine cooling water pumps and their accessories
15
2021-07-15
Working principle of K700 water pump
In a car equipped with K700 water pump, as in ordinary vehicles, there are several cooling water circulation channels inside the car, which are connected with the radiator (commonly known as water tank) at the front of the car through water pipes to form a large water circulation system. At the upper outlet of the engine, K700 water pump is installed, which is driven by a belt, K700 water pump can pump hot water out of the water channel of engine block and cold water in.
Next to the K700 water pump, there is also a thermostat. When the car starts, it does not turn on, so that the cooling water does not pass through the water tank, but only circulates in the engine (commonly known as small cycle). When the temperature of the engine reaches above 95 ℃, it turns on, and the hot water in the engine is pumped into the water tank, and the cold air when the car moves forward blows through the water tank to take away the heat.
The engine drives the bearing and impeller of K700 water pump to rotate through the belt pulley. The coolant in K700 water pump is driven by the impeller to rotate together. Under the action of centrifugal force, it is thrown to the edge of the water pump shell. At the same time, a certain pressure is generated, and then it flows out from the outlet channel or water pipe. The pressure at the center of the impeller is reduced because the coolant is thrown out. Under the pressure difference between the inlet of K700 water pump and the center of the impeller, the coolant in the water tank is sucked into the impeller through the water pipe to realize the reciprocating circulation of the coolant.
The bearing supporting K700 water pump shaft is lubricated with grease. Therefore, it is necessary to prevent the coolant from leaking into the grease, which will cause the grease emulsion, and at the same time prevent the grease from leaking. The sealing measures to prevent leakage of K700 water pump include water seal and gasket. The water seal dynamic seal ring and shaft are installed between the impeller and the bearing through interference fit, and the water seal static seal seat is tightly pressed on the shell of the water pump, so as to achieve the purpose of sealing the coolant.
K700 water pump shell is connected with the engine through the gasket, and supports the bearings and other moving parts. There is a drain hole on the pump shell, which is located between the water seal and the bearing. Once the coolant leaks through the water seal, it can be discharged from the drain hole to prevent the coolant from entering the bearing cavity, damaging the bearing lubrication and causing corrosion of components.
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