A lot of people know
Cooling fanHow to use it, we have also popularized the fault handling and causes of the hot fan and how to prolong its life, so today we will introduce how it is designed.
Step one:
The design of the cooling fan first measures the relationship between the air volume and the wind pressure, and it is very difficult to measure the characteristics of the air flow. At present, there are two ways to measure the static pressure and air volume, one is the wind tunnel test, the other is the double box method. The air volume and static pressure characteristic specifications are measured in a double-box manner. The air density is adjusted by extracting air from the variable exhaust system in a double-box manner. The instantaneous opening of the nozzle will cause the instantaneous change of static pressure and air volume, and then read the pressure reading on each static pressure meter.
Under standard atmosphere and fixed operating voltage and frequency, static pressure is expressed as a function of air volume. The static efficiency of the cooling fan is equal to the volume of the air volume multiplied by the static pressure and divided by the input electric energy. The cooling fan includes a motor, a fan blade and an outer frame, so its efficiency includes the motor efficiency of the motor and the air flow efficiency of the fan blade and the outer frame.
Step two:
Full system impedance/system characteristic curve of the cooling fan When air flows, the airflow will encounter obstacles from internal parts of the system in its flow path, and its impedance will restrict the free circulation of air. The change in pressure is the measured static pressure, expressed in inches of water column. In order to confirm the cooling wattage of each slot row, the system design or manufacturer must not only have the effective fan characteristic curve of the cooling fan to determine its maximum air volume, but also must know the wind resistance curve of the system. Parts inside the system cause a loss of wind pressure. This loss varies with the amount of air, the so-called system impedance.
In addition, the system operating point of the cooling fan The intersection of the system characteristic and the fan characteristic curve is called the system operating point, which is the optimal operating point of the cooling fan. At the operating point, the change slope of the cooling fan is the smallest, and the rate of change of the system characteristic curve is the lowest. Note that the static efficiency of the cooling fan (air volume x wind pressure ÷ power consumption) is optimized at this time.
In addition, we should also pay attention to keeping the air flow as unobstructed as possible when designing, keeping the air inlet and air outlet unblocked, and the cooling fan guiding the air flow vertically through the system to ensure smooth air flow and improve cooling efficiency.
Shenzhen Jiangshanlai Electronic Technology Co., Ltd. was founded in Shenzhen, China in 2005. It is a large-scale enterprise specializing in the customization, research and development, manufacturing, sales and service of DC brushless motors, DC cooling fans, DC brushless fans, DC bracket fans, supercharged cooling fans, micro cooling fans, DC cooling fans, DC blowers, and non-standard fans, DC fan wholesale manufacturers and DC fan suppliers. Products sell well in Guangdong, Shenzhen, Guangzhou, Dongguan, Fujian, Zhejiang, Jiangsu and other places.
