Water pump is used for cooling fluid pressure, ensure its circulating in the cooling system. Widely used in automotive engine centrifugal pumps. When the pump impeller rotates, the cooling liquid in the pump is the impeller driven rotating together, and under the action of centrifugal force is flung to the pump shell edge, at the same time produce certain pressure, and then from the outlet pipe flow. In the center of the impeller pressure due to the cooling liquid was thrown down, in the radiator coolant pump with the impeller center imports of the inlet pipe into the impeller center under the action of pressure difference. Made from cast iron or plastic impeller, the impeller on usually has six to eight radial straight or curved blade after leaf. Pump shell made of cast iron or cast aluminum, inlet and outlet pipe and the pump shell cast. The Water Pump driven by： Generally speaking, the crankshaft through the V belt drive pump. Belt around the crankshaft pulley and water pump pulley, so the pump rotation speed and engine speed is proportional to the some of the engine water pump is directly driven by a camshaft.
The cooling system of circulation, pulmonary circulation:
Usually, the cooling water circulating in the cooling system has two routes, a large cycle, another for the minor cycle. Is the so-called circulation water temperature is high, the water through the radiator of the circulation flow; And the minor cycle is when the water temperature is low, the water without going through the radiator of the circulation flow, so that the water temperature to rise.
When the engine work under normal thermal state, namely water temperature higher than 80 ℃, cooling water shall all be flowing through the radiator, forming large cycle. This time of the probe is the main valve fully open, and side will bypass valve hole can completely shut down.
When the cooling water temperature is below 70 ℃, expansion tube inside the steam pressure is small, to shrink the cylinder to a minimum level. Main valve pressure on the valve seat, the main valve closed, side valves open at the same time, the water cut off by the engine water jacket to the radiator, only by the side of the water in the water jacket by the by-pass pipe hole and flows into the water pump, and into the engine water jacket, water pump pressure of cooling water is not flowing through the radiator, at this time only minor cycle between the water jacket and water pump, to prevent engine too cold, and make the engine heat up rapidly and evenly; When the engine cooling water temperature within the scope of the 70-80 ℃, the main Exhaust Valve and the valve is in a state of half closed, as part of the water circulation, and the other part of the small cycle of water.
The cooling system of circulation, pulmonary circulation:
Usually, the cooling water circulating in the cooling system has two routes, a large cycle, another for the minor cycle. Is the so-called circulation water temperature is high, the water through the radiator of the circulation flow; And the minor cycle is when the water temperature is low, the water without going through the radiator of the circulation flow, so that the water temperature to rise.
When the engine work under normal thermal state, namely water temperature higher than 80 ℃, cooling water shall all be flowing through the radiator, forming large cycle. This time of the probe is the main valve fully open, and side will bypass valve hole can completely shut down.
When the cooling water temperature is below 70 ℃, expansion tube inside the steam pressure is small, to shrink the cylinder to a minimum level. Main valve pressure on the valve seat, the main valve closed, side valves open at the same time, the water cut off by the engine water jacket to the radiator, only by the side of the water in the water jacket by the by-pass pipe hole and flows into the water pump, and into the engine water jacket, water pump pressure of cooling water is not flowing through the radiator, at this time only minor cycle between the water jacket and water pump, to prevent engine too cold, and make the engine heat up rapidly and evenly; When the engine cooling water temperature within the scope of the 70-80 ℃, the main Exhaust Valve and the valve is in a state of half closed, as part of the water circulation, and the other part of the small cycle of water.
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