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Introduction to the working principle of car cooling fans

Introduction to the working principle of car cooling fans
The number of cars in our country is increasing, and everyone is familiar with cars, but they are not so familiar with the car cooling fans in cars. Today, Rui Anpu mainly introduces the working principle of car cooling fans.
 
The operation of the automobile electronic fan is controlled by the engine coolant temperature switch, and usually has two speeds of 90℃, a low speed of 95℃, and two high speeds. In addition, turning on the air conditioner will also control the operation of the electronic fan (condenser temperature and refrigerant pressure control). One is a silicon oil clutch cooling fan, which relies on the thermal expansion characteristics of silicon oil to drive the fan to rotate; an electromagnetic clutch cooling fan uses the principle of electromagnetic field to drive the fan. The main advantage is that the fan is only driven when the engine needs to cool down, so as to minimize the energy loss of the engine.
 
The car fan is installed behind the water tank (close to the side of the engine compartment), and when it is turned on, the wind is drawn in from the front of the water tank; but there are some models of fans that are installed in the front (outside) of the water tank, and the wind is directed to the water tank when it is turned on Direction blowing. The fan starts or stops automatically according to the water temperature. When the speed of the vehicle is fast, the air pressure difference between the front and rear of the vehicle is enough to act as a fan to maintain the water temperature at a certain level. The fan can stop working.
 
　　 1. The electronic fan only works to lower the temperature of the water tank
 
　　2. The temperature of the water tank is affected by two aspects, one is the cooling of the engine block and gearbox, and the other is the heat dissipation of the air conditioning condenser.
 
　　3. The air conditioner condenser and the water tank are two parts, which are close to each other. The front is the condenser and the back is the water tank.
 
　　4. Air conditioning is a relatively independent system in the car. But the activation of the air conditioner switch will give a signal to the electronic fan control unit J293 to force the electronic fan to rotate.
 
　　 5. The big fan is called the main fan, and the small fan is called the auxiliary fan
 
　　 6. The thermal switch transmits the signal to the electronic fan control unit J293, and J293 controls the electronic fan to start at different speeds.
 
　　7. The realization of high-speed and low-speed is very simple. High-speed does not connect resistors in series, and low-speed resistors are connected in series (this principle is also used to adjust the air volume of air conditioners).
 
I believe that after the above introduction, everyone has an understanding of the working principle of the car cooling fan. If you have any questions, please go to Ruiapple for consultation.
Shenzhen Ruiapple Electronics Co., Ltd. is a professional fan manufacturer with 20 years of R&D, production and sales experience. Main business: Cooling fan, DC fan, AC fan, silent fan, centrifugal fan, blower and other full range of cooling and ventilation products as an integrity company, the series of cooling fan products have obtained UL, CUL, CE, CCC, ROHS, etc. International Certification.