Regenerative blowers are air blowers that use centrifugal motion to move air. They can be used to evacuate air from enclosures or to direct airflow at or into something. Regenerative blowers are useful because they can achieve the same level of airflow as much larger blowers of different configurations.
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Regenerative blowers are used in spaces where a high capacity blower is needed but where space is limited. Their design also allows for somewhat quiet operation, so they are useful in settings where reduced noise is necessary such as in office HVAC systems. Manufacturers offer regenerative air blowers of varied constructions for industrial vacuum and compression applications, even in chemical processing and specialty gas environments. Manufacturers can accommodate variable flows and spatial needs, offering compact dimensions, lightweight construction and instrument grades. Regenerative blowers can use direct current motors, alternating current single-phase motors, alternating current three-phase motors or engine power. Regenerative air blowers can also be used in air compression systems and vacuum pumps.
Regenerative blowers make use of some of the most complicated blower design principles. As a regenerative blower's blades (impellers) turn, they suck in nearby air. The air is accelerated in the blower's annular housing (annular housing is the term for the circular enclosure in which the blower's impellers turn) because of centrifugal motion. Regenerative blowers are unique in that as their impellers turn, the relationship they have with each other and with the annular housing allows for extra pressure to be applied to the air with each blade with which the air comes into contact. This is one reason why regenerative air blowers are capable of generating as much airflow as larger blowers. The process of each blade interacting with the air and pressurizing it is called "regeneration." It is from this process that regenerative blowers take their name. The second reason is because at the blower's outlet (which is where the air is expelled from the annular housing), a fitted ring between the housing and the outlet strips the air. This creates airflow at a higher pressure than if the outlet was simply an opening.
