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What are the basic knowledge of the cooling fan? 时间:【2018-08-07】 共阅【3846】次 【打印】【返回

As the plant increases equipment and needs to buy various types of machinery, it is a key problem to prolong the service life of the mechanical equipment, and the technical and performance aspects of the cooling fan have fully reached the mature stage. It can effectively reduce the temperature of the working environment and extend the equipment. Service life. So what are the basic knowledge of the cooling fan? The following is a detailed introduction of Shenzhen Ying Tian mechanical and Electrical Equipment Co., Ltd.

 

 

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  First, the operating principle of the cooling fan:
  
  According to the right rule of the ampere right hand, the conductor passes through the current, and the magnetic field will be generated around it. If the conductor is placed in another fixed magnetic field, it will produce a suction or repulsion force, causing the object to move. A magnetic rubber magnet is attached inside the fan blade of the radiator fan. Around the silicon steel sheet, the axis part wound two sets of coils, and uses the Holzer induction component as the synchronous detection device to control a set of circuits that make the two coils winding the axis of the axis work in rotation. Silicon steel sheets produce different magnetic poles, which produce repulsive force with rubber magnets. When the suction force is greater than the static friction force of the louse fan, the blades rotate naturally.  
  Two, the speed of the cooling fan:
  
  The speed of the cooling fan is the number of rotations per minute of fan blades. The unit is rpm. Fan speed is determined by the number of turns in the motor inner coil, working voltage, the number of fan blades, inclination, height, diameter and bearing system. There is no necessary connection between the speed and the quality of the fan. The speed of the fan can be measured by the internal speed signal, and it can be measured outside (external measurement is how fast the fan turns with other instruments. The internal measurement can be seen directly in the BIOS or through the software. " The internal measurement is relatively large in error.  
  With the change of ambient temperature, sometimes different speed fans are needed to meet the demand. The speed of the fan can be automatically controlled according to the current working temperature (such as the temperature of the radiator), the high temperature increases the speed and the low temperature reduces the speed, so as to achieve a dynamic balance, thus keeping the best combination of the wind noise and the heat dissipation effect.  
  Three, the air volume of the fan:
  
  The air volume of the fan is the total volume of air that is discharged or included per minute of the air cooled radiator fan. If the unit is calculated by cubic feet, the unit is CFM; if it is calculated by the cubic meter, it is CMM. The air volume unit used for radiator products is CFM (about 0.028 cubic meters / minute).  
  When the heat sink material is the same, the air volume is the most important index to measure the cooling capacity of the air cooled radiator. Obviously, the larger the radiator is, the higher the heat dissipation capacity of the radiator fan. This is because the heat capacity ratio of the air is fixed, and the greater the air volume, that is, more air per unit time can take away more heat. Of course, under the same air volume, the cooling effect is related to the way of wind flow. Air volume and wind pressure and wind pressure are two relative concepts.

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