HR Blowers/Exhausters

HR Blowers/Exhausters  
 
The HR Series of positive displacement air blowers follows the well established principle of the Roots type machine. Operation is both, simple and effective - twin impellers mounted on parallel shafts and contained within a casing, rotate in opposite directions. The shape of the impellers is such that a small accurately gauged clearance is maintained at all times between the impellers and casing. As they rotate, air is drawn into the space between the impellers and the casing where it is trapped as the tip of the impeller passes the edge of the opening.
 
Continuing its rotation, the opposite tip of the impeller passes the edge of the outlet opening and the trapped air is pushed through the outlet into the air line. This action is repeated twice for each revolution of the impeller, or four times for each revolution of the driving shaft. The volume of air is displaced by one revolution of the drive shaft for each size of blower has been calculated, and the amount of air moved at any given speed and pressure is known. This makes it simple to select the speed at which the blower should operate to supply the required volume of air.
 
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