Both centrifugal blower and regenerative blower are frequently used in most industrial operations. They can look the same but there are actually many differences between the two and knowing them would help you decide which one suits your application best. The key distinction is perhaps can be seen in the configuration of the blowers.
In a centrifugal blower, the inlet and the outlet are configured perpendicularly. The air is being fed into the inlet in the center of the impeller while its outlet is positioned in a way that is divergent to the impeller’s rotation. On the contrary, the inlet and outlet of a regenerative blower are placed to be parallel to one another and are designed perpendicularly to the impeller’s spin.
In terms of impellers and casings, the two blowers also differ. A centrifugal blower’s design enables air to reach the center of the spinning impeller where multiple fixed vanes serve as paddles that propel volumes of air toward the outlet. It is through a centrifugal force, as the name suggests, that air is pushed going toward the impeller and its casing. From there, the air is released as steam via the outlet. This process produces negative air pressure inside the cashing which draws in more air inside it.
On the other hand, a regenerative blower is made in a different way. It houses an impeller that rotates within the casing. This chamber has inboard and outboard channels, hence this blower is also known as a side-channel blower. Once the impeller rotates past the intake, the air is sucked that is trapped between the blades of the impeller. As the rotation continues, the air is then pushed inward and outward via the channels and it stops only when the impeller halts spinning. This is why the regenerative blower is also referred to as a vacuum blower.
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