Claw vacuum pumps and compressors operate upon a static compression system that works by internal volume contraction.

Suitable for applications requiring pressure, vacuum or pressure/vacuum simultaneously

Vacuum up to 150 mbar (abs) and capacities from 100 to 600 m³/hr

Pressure up to 2.2 bar and flow rates from 100 to 600 m³/hr

In combined operation, vacuum up to -0.6 bar and pressure up to 1.0 bar can be achieved simultaneously

Technical Overview
As with rotary vane pumps and roots blowers, ZEPHYR claw compressors and vacuum pumps have static compression systems as a principle of design. In contrast to roots blowers compression works by internal volume contraction.

In all ranges of application - pressure, vacuum and both combined - this static principle of design gives extremely good operational possibilities.

Depending on size, vacuum up to 150 mbar (abs) and capacities between 100 and 600 m³/hr as well as pressure up to 2.2 bar (g) at flow rates between 100 and 600 m³/hr can be achieved. In combined operation simultaneous vacuum up to -0,6 bar and pressure up to +1,0 bar can be obtained.

The Claw Principle
A claw pump consists of two rotors (1,2). They turn in opposite directions in a compressor housing (9) without friction and with very tight clearances. They are synchronised via a precision gear. As the claw moves over the suction connection (3) and the axial suction channel inlet (4) the gas is sucked into the compressing chamber.

Due to the revolution of the rotors the gas is conveyed from the suction side to the pressure side. There it is compressed by the reduction of the volume between the rotors until the lower rotor uncovers the discharge channel (5).

The "internal compression" leads to high difference pressure at efficiencies of more than 60%. Afterwards the pre-compressed gas is discharged via the pressure connection (8).

To remove the compression heat, cooling air is sucked between the compressing housing (9) and a silencing cover (10) and then it is lateral exhausted.