Classification and performance of cooling fans

1. Mixed flow fan:

Mixed-flow fans are also called diagonal flow fans. At first glance, mixed-flow fans are no different from axial-flow fans. In fact, the intake of mixed-flow fans is along the axis, but the outflow is along the diagonal direction of the axis and the vertical axis.Performance: Mixed flow fans have higher wind pressure due to the conical shape of the blades and shroud. Under the same size and other comparable performance, centrifugal fans have lower noise than axial flow fans, so they have high flow rates and relatively high wind pressure.

2. DC cooling fan:

The DC cooling fan converts electrical energy into machinery through DC voltage and electromagnetic induction to drive the fan blades to rotate. Its technology and performance have fully reached a mature stage, and new technologies continue to emerge. At present, DC cooling fans have been widely used in computers, communication products, medical equipment, heaters, air conditioners, frequency converters, teller machines, welding machines, audio equipment, environmental protection equipment, refrigeration equipment and other industries.

Performance: It has the characteristics of strong operation stability, good heat dissipation effect and long service life.

3. Axial flow fan:

The blades of an axial fan push the air to flow in the same direction as the shaft. The impeller of the axial fan is somewhat similar to the propeller. When it is working, most of the airflow is parallel to the axis, in other words, along the axis. When the inlet air flow is free air with 0 static pressure, the axial flow fan has the lowest power consumption. When running, the power consumption will increase with the rise of the airflow back pressure, so it is usually installed on the cabinet of the electrical equipment, and sometimes integrated. on the motor.Performance: It has the characteristics of high flow rate and medium wind pressure. Due to its compact structure, the axial flow fan can save a lot of space and is easy to install, so it is widely used.

4. Centrifugal fan:

When the centrifugal fan is working, the blades push the air to flow in a direction perpendicular to the axis (ie radial direction), the intake air is along the axis direction, and the air outlet is perpendicular to the axis direction. In most cases, the cooling effect can be achieved by using an axial fan. However, sometimes a centrifugal fan must be used if the airflow needs to be rotated by 90 degrees or when a large air pressure is required. Strictly speaking, the fan is also a centrifugal fan.