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Structure of centrifugal fan

Oct 03, 2020

A centrifugal fan is a driven fluid machine, which is composed of multiple parts. If the design of each part is different, the structure of the entire centrifugal fan will be very different. Whether it is its air intake mode, rotation direction, air output, transmission mode, impeller structure, etc., there are many options.

From the perspective of air intake, centrifugal fans generally use single-stage impellers with single-sided air intake. However, some fan impellers with large flow are sometimes made of double-sided air intake; at the same time, we also Concerned about the direction of rotation of the centrifugal fan, it can be simply made into right-handed and left-handed.

The position of the air outlet of the centrifugal fan can also be made up, down, horizontally to the left, right, and inclined in various directions according to the requirements of use. For ease of use, the air outlet is often made into a structure that can be rotated freely, so that everything can be easily adjusted.

According to the actual use, there are many transmission modes of centrifugal fans. If the rotation number of the fan is the same as the rotation number of the motor, the transmission mode of the coupling can be adopted for the fan with a larger body; on the contrary, for a smaller body, For lighter fans, the impeller can be directly mounted on the motor shaft, so the structure is simpler and more compact.

The impeller is one of the main components of a centrifugal fan. Its size and geometry have a significant impact on the performance of the fan, so you must be careful when choosing the impeller form. The impeller of a centrifugal fan is composed of a front disc, a rear disc, blades, and a hub. The front disc has a flat front disc, a conical front disc, and an arc front disc.