News Center

[Did You Know About Cooling?] What are the roles of fan blades in DC fans?

Category:

Industry Trends

Release time:

2019-10-14

With the rapid advancement of technology, more industries are increasingly adopting... Cooling fan The demand for cooling fans is steadily increasing. Industries such as the power supply sector, variable-frequency drive industry, aerospace industry, electrical appliance industry, and telecommunications industry all rely heavily on cooling fans. DC fans convert electrical energy into mechanical energy through direct current voltage and electromagnetic induction, thereby driving the fan blades to rotate. Thus, the fan housing and blades together form an integral component that is indispensable. Most people recognize the importance of these two parts, but what exactly is their relationship and function?
 
First, blade curvature: Within a certain range, the greater the blade curvature of a DC fan, the greater the kinetic energy of the gas at the same rotational speed—resulting in higher airflow and higher static pressure. At the same time, the resistance experienced by the blades also increases, thereby requiring greater torque from the motor.
 
Second, the motor diameter: Due to the presence of the motor and bearings, the central portion of the DC fan’s spindle inevitably contains a blind zone where no airflow passes through. The diameter of the spindle directly determines the size of this blind zone. The smaller the spindle diameter, the more critical it becomes to consider the power of the fan motor—higher-power motors require larger stator winding coils, which naturally occupy more space. When there is no room for vertical expansion (increasing the height), the only option left is horizontal expansion (increasing the area).
 
Third, blade curvature: In addition to having a certain degree of curvature in their cross-sections, the blades of DC fans do not extend vertically along the radial direction when viewed from above; rather, they curve slightly toward the direction of rotation, exhibiting a definite arc shape. If the blades were to extend vertically along the radial direction, the airflow generated by the rotation of the DC cooling fan would scatter at the outlet, resulting in a short air delivery range and a lack of concentrated “force.” However, if the blades have a slight arc curvature—as is the case with current product designs—this ensures that the blown air remains concentrated within a column-shaped space directly in front of the outlet, thereby increasing both the air delivery distance and the air pressure.
 
Fourth, blade spacing: If the spacing between blades is too small, it will cause airflow disturbances, increase friction on the blade surfaces, and reduce the fan’s efficiency. On the other hand, if the spacing between blades is too large, it will lead to increased pressure loss and insufficient wind pressure.
 
The above is a sharing of knowledge about DC cooling fans. Shenzhen Jiangshanlai Electronic Technology Co., Ltd. is a large-scale enterprise integrating customization, R&D, manufacturing, sales, and service of DC brushless motors, DC cooling fans, DC brushless fans, DC stand fans, boosted cooling fans, miniature cooling fans, DC cooling fans, DC blowers, and non-standard fans. We are a wholesale manufacturer and supplier of DC fans. Our products are best-selling in Guangdong Province—including Shenzhen, Guangzhou, and Dongguan—as well as in Fujian, Zhejiang, and Jiangsu provinces.
 
If you have any needs, feel free to consult us.

Previous: [Thermal Management Insights] Structural Components of DC/AC Direct-Current and Alternating-Current Cooling Fans

Next: [Did You Know About Cooling?] Key Points for Installing DC Fans

Related News

Company dinner

Company dinner

On these busy days, I’m grateful to have you all fighting side by side! At this company dinner, everyone can put aside their daily hustle and enjoy some wonderful moments together. Let’s raise our glasses and chat freely—may delicious food and laughter accompany us as we strengthen our team spirit and build an even warmer sense of unity!

2025-08-27

Weekend team-building event

Weekend team-building event

The weekend team-building event by the seaside came to a perfect close! With sunny beaches and endless laughter, the team collaborated seamlessly in fun-filled games, relaxing their minds and bodies amid the soothing sound of ocean waves. Filled with renewed energy, we’re ready to join hands and tackle new challenges together!

2025-08-25

Display cabinet

Display cabinet

The newly installed display cabinets at the Huizhou company are gradually being filled up...

2025-08-21

Jiangshan Lai Electronics wishes you a happy Mid-Autumn Festival 2022!

Jiangshan Lai Electronics wishes you a happy Mid-Autumn Festival 2022!

On a day of blooming flowers and a full moon, When families are reunited in joy, May our land send you warm wishes for a happy Mid-Autumn Festival!

2022-09-10

Jiangshan wishes you a healthy and happy Dragon Boat Festival 2022!

Jiangshan wishes you a healthy and happy Dragon Boat Festival 2022!

The fragrant aroma of zong leaves fills the air on May 5th— May our heartfelt wishes bring you peace and well-being this Dragon Boat Festival! May our land send its best wishes for your health and happiness this Dragon Boat Festival 2022!

2022-06-03

May the land and rivers bring you joy as we celebrate Labor Day!

May the land and rivers bring you joy as we celebrate Labor Day!

Salute to the workers! May our country and its people bring joy and happiness to all our customers and employees on this special occasion!

2022-05-01

The Knowledge Principles and Internal Structure of DC Brushless Cooling Fans

The Knowledge Principles and Internal Structure of DC Brushless Cooling Fans

2022-04-25

Advantages and Applications of Oil-Bearing DC Fans

Advantages and Applications of Oil-Bearing DC Fans

The pivot joint is fixed at the position of the motor stator base, ensuring an appropriate gap between the rotor and the stator. Of course, there must also be a clearance between the shaft core and the bearings to prevent the shaft core from becoming locked and thus unable to function. The stator structure of the motor—hereafter referred to as the "stator"—is designed in such a way that, once power is supplied, an induced magnetic field will be generated between the rotor and the stator. The control circuit then drives the electric fan motor into operation. Therefore, in the conventional fan motor design, as long as the fan rotor, the motor stator, and the drive circuit work together via the pivot joint between the shaft core and the bearings and through magnetic field induction, the motor can operate effectively.

2022-04-18