Centrifugal fan collector and impeller structure analysis!
Release time:
2018-05-23
Centrifugal fan equipment, collector and impeller are important components. The collector is also called the bell mouth, which is the inlet of the centrifugal fan. Its function is to evenly introduce the gas into the impeller with less loss.
In comparison, the main advantage of the cylindrical structure of the collector is that the processing is simple, but there is a large loss, and the flow of the flow into the impeller is not good. Conical collectors, on the other hand, are slightly better than cylindrical, but still not good.
The arc-shaped current collector is better than the first two types and is widely used in practice. The hyperbolic collector has less loss and better flow conditions for guiding the airflow into the impeller. The disadvantage is that the processing is more complex, processing and manufacturing requirements are higher, widely used in high-efficiency centrifugal fans.
The impeller is a very critical component for centrifugal fans. At the same time, the size and shape of the impeller itself will directly affect the performance of the equipment.
In the centrifugal fan, because of its blade outlet angle is different, it can be divided into three kinds of forward, radial and backward. In the case of the same circumferential speed of the impeller, the larger the blade outlet angle, the higher the pressure generated. Therefore, two centrifugal fans of the same size and the same speed, the pressure of the forward curved impeller is higher than that of the backward curved impeller.
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