ring blower

The blower include an impeller and a side channel formed with a semi-circular side wall, having an inlet and outlet. As the impeller rotates, the air between the impeller blades is radially and circumferentially accelerated and pushed into the side channel. Here it is further compressed and forced back towards the impeller blades where the air is further accelerated. As air is transported along a spiral path through the impeller and side channel, each impeller blade increases the compression and acceleration until the air reaches the point where the side channel is connected to the discharge flange, where it is discharged. This type of blower is also referred to by other names such as Regenerative blower, Ring Compressor, Side channel blower or Vortex Blower.
The ring blower or exhauster increases the pressure of the aspirated gas by the creation, in the peripheral torodial channel, of a series of vortexes caused by the centrifugal thrust of the impeller.
While the impeller is rotating, the vanes force the gas forward and, because of the centrifugal thrust, outwards, producing a helical motion. During this motion, the gas is recompressed repeatedly with a consequent linear pressure increase along the length of the channel.