How does the Honda radiator fan behind the Honda radiator work?
In order to avoid overheating of the engine, the components around the combustion chamber (cylinder liner, cylinder head, valve, etc.) must be properly cooled. There are three types of cooling devices for internal combustion engines, water cooling, oil cooling, and air cooling. The Honda engine cooling unit is mainly water-cooled, cooled by circulating water in the cylinder water channel, and the heated water in the water channel is introduced into the radiator (water tank), cooled by the air and returned to the water channel.
In order to ensure the cooling effect, the Honda cooling system is generally composed of a radiator (1), a thermostat (2), a water pump (3), a cylinder water channel (4), a cylinder head water channel (5), and a Honda radiator fan. Taking a car as an example, the radiator is responsible for the cooling of the circulating water. The water pipe and the heat sink are mostly made of aluminum, the aluminum water pipe is made into a flat shape, the heat sink is corrugated, and the heat dissipation performance is emphasized, and the installation direction is perpendicular to the air flow. Direction, try to achieve a small wind resistance and high cooling efficiency.
The cooling water inside the radiator is not simply water, but a mixture of water (conforming to drinking water quality), antifreeze (usually ethylene glycol) and various special purpose preservatives, also known as coolant. The antifreeze content in these coolants accounts for 30% to 50%, which increases the boiling point of the liquid. Under a certain working pressure, the allowable working temperature of the car coolant can reach 120 degrees Celsius, exceeding the boiling point of water and not easily evaporating. .
The engine is realized by the circulation of the coolant. The part that forces the coolant to circulate is the water pump, which is driven by the crankshaft belt, which pushes the coolant to circulate throughout the system. The cooling of these coolants to the engine is regulated at any time depending on the operation of the engine. When the engine temperature is low, the coolant makes a small cycle inside the engine itself. When the engine temperature is high, the coolant circulates between the engine and the radiator. The control unit that realizes the different circulation of the coolant is the thermostat. The thermostat is actually a valve. The principle is to use a material that can expand and contract with temperature, such as paraffin or ether, to open and close the valve. When the water temperature is high, the material expands to open the valve, and the coolant performs a large cycle. When the material is low, the material shrinks to close the valve and the coolant is small.
In order to improve the cooling capacity of the radiator, a Honda radiator fan is installed behind the radiator for forced ventilation. The previous car radiator Honda radiator fan is directly driven by the crankshaft belt. When the engine starts, it will turn, it can't change depending on the engine temperature change. In order to adjust the cooling force of the radiator, it is necessary to install the movable louver on the radiator. To control the wind into the air. Hyundai cars have generally used Honda radiator fan electromagnetic clutch or electronic Honda radiator fan. When the water temperature is low, the clutch is separated from the rotating shaft. The Honda radiator fan does not move. When the water temperature is relatively high, the temperature sensor is connected to the power supply to make the clutch and the clutch. The shaft is engaged and the Honda radiator fan rotates. Similarly, the electronic Honda radiator fan is directly driven by the motor, and the temperature sensor controls the motor to operate. Both forms of radiator fan operation are actually controlled by temperature sensors.
The radiator serves as both water storage and heat dissipation. If it relies solely on the radiator, there are three disadvantages. First, the water absorption side of the pump is easy to boil due to low pressure, and the impeller is easy to cavitation; the second is that the gas and water separation is not easy and the gas resistance is easy; The high temperature coolant is easy to boil away. Therefore, the designer added an expansion tank, and the upper and lower water pipes are respectively connected with the upper part of the radiator and the water inlet of the water pump to prevent the above problems.
Now the car's cooling system is more complicated than in the past, mainly by adding temperature control components. The radiator Honda radiator fan can be “randomly strained” with engine temperature changes, and the cooling system generally uses coolant. Of course, the heat of the engine is also the energy produced by the fuel, and cooling it is actually a waste of time. Therefore, people are studying a heat-insulating engine made of ceramic material without cooling. Once realized, the engine will be small and simple.