Centrifugal fan is a kind of driven fluid machinery, which consists of many parts. If the design of each part is different, the structure of the whole centrifugal fan will be very different. Whether it is its air intake mode, rotation direction, air output or transmission mode, impeller structure, etc., there are a variety of choices.
From the point of view of intake mode, centrifugal fans generally adopt single-stage impeller and single-side intake structure; but some fans with large flow sometimes make double-side intake; at the same time, we also pay attention to the rotation direction of centrifugal fans, which can be simply made into right-hand and left-hand.
Secondly, the outlet position of centrifugal fan can also be made up of upward, downward, horizontal to left, right, inclined in all directions and other forms according to the requirements of use. In order to use conveniently, the outlet is often made into a structure which can rotate freely, so that any convenience can be easily adjusted.
According to the actual use of different ways, centrifugal fan transmission also has a variety of, if the fan speed and motor speed are the same, for the larger fan body can be used coupling transmission mode; on the contrary, for the smaller body, turn to the lighter fan, the impeller can be installed directly on the motor shaft, so the structure is simpler and more compact.
Impeller is one of the main components of centrifugal fan, its size and geometry shape have a significant impact on the performance of the fan, so when choosing the impeller form, we must be careful. The impeller of centrifugal fan is composed of front disc, rear disc, blade and hub. The front disc is in the form of flat front disc, conical front disc and arc front disc.