Motorcycle water cooling system principle Who knows?
Water cooling system is generally composed of radiators, thermostats, pumps, waterways and other components. The radiator is responsible for the cooling of the circulating water. Its water pipes and heat sinks are made of aluminum. The aluminum pipes are made into a flat shape. The heatsink is corrugated and the heat dissipation performance is installed. The installation direction is perpendicular to the direction of air flow. Wind resistance is small, cooling efficiency is high. Radiator is divided into two kinds of cross flow and vertical flow, air conditioning condenser is usually installed with it.
The engine is realized by the circulation of the coolant, and the component that forces the coolant circulation is the pump, which is driven by the crankshaft belt, which drives the coolant to circulate throughout the system. At present, the most advanced pump is BMW's new generation of straight six engines on the use of electric pumps, it can accurately control the pump speed, and effectively reduce the output power loss. These coolants on the engine cooling, according to the work of the engine at any time to adjust. When the engine temperature is low, the coolant in the engine itself to do a small cycle, when the engine temperature is high, the coolant in the engine - the radiator between the big cycle. The control part that realizes the coolant to do different cycles is the thermostat. Can be used as a valve thermostat, the principle is to use the material can be extended with the temperature (paraffin or ether and other materials) to do the switch valve, when the water temperature is high when the material expands the top of the valve, the coolant for a large cycle When the water temperature is low, the material shrinks off the valve and the coolant is small.
Radiator as a storage and cooling effect, and then also installed on the expansion tank. Because the simple depend on the radiator has several shortcomings, one pump side of the water due to low pressure and easy to boil, the pump impeller easy to cavitation; Second, air and water separation will produce air resistance; Third, the high temperature coolant easy boiling. So the designer to install the expansion of the tank, it is the upper and lower two water pipes and the upper radiator and water pump inlet connection to prevent the above problems.
Although we call it water-cooled but the cooling medium is not pure water, but by the water, antifreeze and a variety of special purpose preservative mixture, also known as coolant. The coolant in the coolant content of 30% to 50%, improve the freezing point of the liquid to prevent freezing at low temperatures and damage the engine. The whole cooling system is not connected with the atmosphere, the equivalent of the role of the pressure cooker, the tank is equivalent to high pressure valve, under normal circumstances, the motorcycle coolant allows the working temperature up to 120 degrees Celsius, improve heat transfer capacity.