DC fan specifications and characteristics

When you are choosing a fan, the following related knowledge will provide you with a favorable reference, really allow you to choose a fan product that meets your own use. One, the choice of fan specifications: 1, the choice of fan frame size:
1-1] [Length 25 × Width 25 × Thickness 10mm]: Industry Abbreviation 2510 1-2] [Length 40 × Width 40 × Thickness 20mm]: Industry Abbreviation 4020 1-3] [Length 60 × Width 60 × Thickness 15mm] :Industry abbreviation 6015 1-4] [Length 80×Width 80×Thickness 25mm]: Industry abbreviation 8025 1-5] [Length 120×Width 120×Thickness 25mm]:Industry abbreviation 12025 1-6] 12032[Length 120×Width 120×thickness 32mm]:Industry abbreviation 12032 etc. 1-7) The outer dimensions of the above fans have different screw hole pitch and screw hole diameter
As shown in the figure above: The external dimension of the fan is 60×60×15mm (referred to as 6015 fan), the screw diameter is Ф4.4mm, and the hole distance is 50.0mm.
2. Fan frame and fan blade plastic material and color selection:
2-1) Fan frame + fan blade: is PBT raw material white (plastic heat distortion temperature 230 ℃) 2-2) Fan frame + fan blade: is PBT raw material black (plastic heat distortion temperature 230 ℃) 2-3) fan frame +Fan blade: is PC raw material is transparent (plastic heat distortion temperature 120 ℃)
2 -4) Fan frame + fan blade: is PC raw material plus different toners to form the appearance color, etc. (plastic heat distortion temperature 120℃) 8025 DC
Cooling fan BF8025 series
3. The choice of fan mechanical bearing system:
3-1] Double-ball dust-proof structure [2 Bearing+S420 iron shaft + dust-proof structure design] Dust-proof structure design ◆Advantages:
a) The running speed of the fan is relatively stable, and the fan speed will not be changed in different positions of the fan installation b) relatively long service life C) easy to produce, process and assemble ◆ Disadvantages a) higher cost
3-2] Single ball dust-proof structure [One ball bearing (Bearing) + oil bearing (Sleeve) + S420 iron shaft + dust-proof structure design] ◆ Advantages:
a) The running speed of the fan is relatively stable, and the speed of the fan will not be changed in different positions of the fan installation. b) The relative service life is moderate ◆ Disadvantages a) High cost
b) The processing difficulty is high, and it is easy to produce abnormal noise during the manufacturing process and use.
3-3] Dust-proof hydraulic top center fixed magnetic fan [Oil-return groove oil bearing (Sleeve) + S420 Iron shaft + dustproof structure design] Oil-impregnated bearing top center design
Oil return system design, dustproof structure design, solid magnet
This form is used in some special models of radiators. The difference between the two types of air supply is the difference in air flow. When blowing air, turbulence is produced, and the wind pressure is high, but it is susceptible to resistance loss; when the air is exhausted, it is laminar flow, and the air pressure is small but the air flow is stable. In theory, the heat dissipation efficiency of turbulent flow is much greater than that of laminar flow, so it has become the mainstream design form. Although the axial fan is widely used, it also has inherent shortcomings. The axial flow fan is blocked by the position of the motor, and the airflow cannot flow smoothly through the middle of the blowing area, which is called the "dead zone".