Much like rotary vane and rotary lobe pumps, the claw compressors and vacuum pumps of the C-Series are based on a static compression system. In contrast to rotary lobes, compression happens internally by volume reduction.
A claw pump consists of two rotors, which turn in opposite directions in a compressor housing without contact with very tight clearances. They are synchronized via a precision gear. As the claw moves over the suction connection and the axial suction channel inlet the gas is sucked into the compression/pumping chamber.
As the rotors revolve, the gas moves from the suction side to the pressure side. It is then compressed by the reduction of the volume between the rotors until the lower rotor uncovers the discharge channel. This “internal compression” leads to high differential pressures at efficiencies of more than 60 %.
Afterwards the pre-compressed gas is discharged via the pressure connection. To remove the heat generated by the compression process, cooling air is sucked in between the compression housing and a silencing cover before it leaves the pump.