Principle of Working
The centrifugal fan uses the centrifugal power generated from the rotation of impellers to increase the pressure of air/gases. When the impellers rotate, the gas near the impellers is thrown-off from the impellers due to the centrifugal force and then moves into the fan casing. As a result the gas pressure in the fan casing is increased. The gas is then guided to the exit via outlet ducts. After the gas is thrown-off, the gas pressure in the middle region of the impellers decreases. The gas from the impeller eye rushes in to normalize this pressure. This cycle repeats and therefore the gas can be continuously transferred.
| Differences between fans and blowers | ||
| Equipment | Pressure Ratio | Pressure rise (mm Hg) |
|---|---|---|
| Fans | Up to 1.1 | 1136 |
| Blowers | 1.1 to 1.2 | 1136-2066 |
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