The technology and performance of the cooling fan has reached the mature stage, and new technologies are emerging. Fan Sizes range from 8 mm to 280 mm, with voltages of 5V, 12V, 24V, 48V, 110V, 220V, 380V, square, round, olive, etc. . According to the different flow direction of fans, fans are divided into four categories: first, axial fan axial fan blades to make air flow in the same direction parallel to the axis. The impeller of an axial fan is similar to the propeller in that most of the air flows in a direction parallel to the axis, in other words, along the Axis. The axial flow fan consumes the least power when the inlet air flow is 0 static free air. The power consumption increases with the increase of the back pressure of the airflow. Axial flow fan is usually installed in the cabinet of electrical and electronic equipment, but also can be integrated with the motor, axial flow fan structure is compact, so it can save a lot of space, and easy to set up, so it is widely used. The square heat sink fan that sees on the market basically can classify to this kind. Axial Flow Fan's main characteristics: meet the high flow rate, wind pressure, the general environment of heat two, mixed-flow Fan Fan mixed-flow fan also called diagonal fan. There is no difference in appearance between the mixed-flow fan and the axial-flow fan. In fact, the inlet of the mixed-flow fan is along the axis, while the outlet is diagonal along the axis and vertical axis. The blades and hood of the fan are called conical, so the wind pressure is high and the noise of the centrifugal fan is lower than that of the axial fan in terms of the same size and other comparative performance. The main characteristics of mixed-flow fans are that under the condition of high flow velocity and relatively high wind pressure, better heat dissipation effect can be achieved. 3. When the Centrifugal Fan of the Centrifugal fan works, the blades make the air flow along the direction perpendicular to the axis, and the suction along the Axis But the exhaust is perpendicular to the shaft. In many cases, cooling can be achieved by using axial fans, but centrifugal fans may be necessary if the airflow needs to be rotated 90 degrees out or if high wind pressure is required. The Fan is also strictly a centrifugal fan. The image of this centrifugal fan is a small centrifugal fan, we generally use a multi-wing Centrifugal Fan, mostly for mechanical, different appearance, but the principle is the same. The key features of CENTRIFUGAL FANS: change the flow of air, compare the current rate, high pressure four, cross-flow fan cross-flow Fan Fan Fan, can create large-scale air flow, generally used to cool the wide surface of equipment. The intake and exhaust of the fan are perpendicular to the axis. The cross-flow fan works with a long cylindrical fan impeller, which has a large diameter and a large diameter. Therefore, on the basis of ensuring the circulation of the whole air, a relatively low rotating speed is used To reduce the noise of high-speed operation. More for elevators, air conditioning, cars and so on. The main features of the cross flow are low velocity, low wind pressure and large heat dissipation area, said 

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