The working position and principle of car cooling fan: working principle of cooling fan
Car cooling fan working position and its principle: cooling fan working principle 1. Water tank temperature sensor (actually a temperature control valve, not a water temperature meter temperature sensor) detects that the water tank temperature exceeds the threshold (usually 95 degrees), then the fan relay Suction; 2. The fan circuit is turned on through the fan relay, and the fan motor starts. 3. When the water tank temperature sensor detects that the temperature of the water tank is lower than the threshold, the fan relay is separated and the fan motor stops working. The factor that affects the operation of the fan is the temperature of the water tank, which has no direct relationship with the water temperature of the engine. The working position and principle of automobile cooling fan: The automobile cooling system is divided into two types. The working position and principle of automobile cooling fan: The automobile cooling system is divided into two types: liquid cooling and air cooling. Liquid-cooled The cooling system of a liquid-cooled automobile circulates liquid through the pipes and passages in the engine. When liquid flows through a high-temperature engine, it absorbs heat, thereby reducing the temperature of the engine. After the liquid flows through the engine, it flows to the heat exchanger (or radiator), and the heat in the liquid is dissipated into the air through the heat exchanger. Air-cooling Some early cars used air-cooling technology, but modern cars hardly use this method anymore. This cooling method is not to circulate liquid in the engine, but to dissipate heat from the cylinder through aluminum fins attached to the surface of the engine block. A powerful fan blows on these aluminum sheets to dissipate heat to the air, thereby cooling the engine. Because most cars use liquid cooling, there are a large number of pipes in the cooling system of the pipe system. After the pump delivers the liquid to the engine block, the liquid starts to flow in the engine passages around the cylinder. Then, the liquid passes through the cylinder head of the engine and returns to the thermostat where the liquid flows out of the engine. If the thermostat is closed, the liquid will flow directly back to the pump through the pipes around the thermostat. If the thermostat is opened, the liquid will flow into the radiator first and then back to the pump. The heating system also has a separate cycle process. This cycle starts with the cylinder head and transfers liquid through the heater bellows and then back to the pump. For cars equipped with automatic transmissions, there is usually a separate cycle to cool the transmission fluid built into the radiator. The transmission fluid is drawn by the transmission through another heat exchanger in the radiator. Liquid cars can work in a wide temperature range from well below zero degrees Celsius to well above 38 degrees Celsius. Therefore, no matter what kind of liquid is used to cool the engine, it must have a very low freezing point, a high boiling point, and can absorb a lot of heat. Water is one of the effective liquids that absorb heat, but the freezing point of water is too high to be suitable for car engines. The liquid used in most cars is a mixture of water and ethylene glycol (c2h6o2), also known as antifreeze. By adding ethylene glycol to water, the boiling point and freezing point can be significantly increased.