![]() This circular flow in combination with the revolution of the impeller causes air to follow a spiral path through a regenerative blower the result is air that is under constant acceleration. The air flow is then forced to the base of a following impeller vane for recirculation in the same manner. As the impellor pushes the air around the ring, centrifugal forces cause the air trapped between the rotating impeller vanes to move towards the blower casing. Unlike centrifugal blower impellers, air enters from a side inlet, not through the centre of the impeller. Regenerative blowers have impellers that are constructed as a solid inside ring with vanes radiating outwards from its edges. Centrifugal blowers can be found with outputs anywhere from hundreds to hundreds of thousands of CFM. For less onerous applications where a less substantial pressure increase is required two centrifugal blowers can be connected in series to emulate a two stage blower.Ĭentrifugal blowers range in physical size from a cubic foot to the size of a small room with a correspondingly large range in volumetric output. Multi-stage centrifugal blowers are normally used in large scale applications such as aeration in water treatment plants. They are generally quite large in order to accommodate several impellers, housings and a motor large enough to power multiple stages. However, a direct drive system will be more energy efficient, as it eliminates the possibility of belt slippage, and it will put an end to maintenance costs associated with belt driven systems.Īlternatively, a multi-stage configuration can be used to generate higher pressures by having the air pass from the outlet of one blower to the inlet of another. In both cases, these high speeds can reduce the expected life of the bearings. High speed belt driven arrangements are another option. These blowers can have very high rates of rotation through the use of direct drive motors controlled via high frequency variable drives. Higher pressures can be obtained by increasing the impeller’s speed of rotation and through the use of specially designed impellers based on turbine technology. Centrifugal blowers are not typically capable of producing high pressures and are best suited for applications requiring large volumes of air supplied at medium to low pressures. The negative pressure created at the centre hub, in turn, sucks in more air. Through centrifugal action, air is forced to the periphery of the housing by the spinning impeller where it is discharged as a steady stream through the outlet. Air enters at the center of a rotating impeller on which there are a number of fixed vanes. ![]()
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