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Reciprocating circulation process and sealing measures of automotive water pumps
- Apr 11, 2018 -

In the cylinder of a car engine, there is a large water circulation system, and an automotive water pump needs to be installed at the upper and lower outlets of the engine. It is driven by a fan belt to pump out the heat in the water channel of the engine block and pump the cold water into it. At the same time, there is a thermostat next to the car's water pump. It only opens when the engine is circulated and pumps hot water into the tank to remove heat.

At present, most of the automotive engines use centrifugal water pumps. The basic structure consists of pump housings, connecting plates or pulleys, water pump shafts and bearings or shaft bearings, water pump impellers and water seals. The main component.

The coolant in the automotive water pump is rotated by the impeller and is thrown against the edge of the pump housing under centrifugal force. At the same time, a certain pressure is generated and then flows out of the outlet channel or the water pipe. At the center of the impeller, the coolant is thrown out and the pressure is reduced. The coolant in the water tank is sucked into the impeller through the water pipe under the pressure difference between the inlet of the pump and the center of the impeller to realize the reciprocating circulation of the coolant.

In order to prevent the automotive water pump from leaking, there are two sealing measures: the water seal and the sealing gasket, in which the water sealing dynamic seal ring and the shaft are interposed between the impeller and the bearing through interference fit, and the water seal static sealing seat is tightly pressed on the water pump. On the shell so as to achieve the purpose of sealing the coolant.

As the core of the automotive water pump work, the movement of the impeller itself is very simple, just rotating with the shaft. However, due to the action of the blades, the movement of the liquid in the impeller is very complicated; on the one hand, with the rotation of the impeller as the implicating movement, on the one hand, the impeller continuously drives off from the rotating impeller, that is, relative to the movement of the impeller. Therefore, the outer diameter of the impeller, the height and angle of the impeller blades, and the clearance with the pump housing directly affect the performance of the pump.