Clean technologies are of particular importance in vacuum technology, as they are both environmentally friendly and economically advantageous. With this in mind, Atlas Copco has developed the new DZS 600 VSD+ and DZS 1200 VSD+ vacuum pumps. The dry, oil-free claw pumps are powerful, energy-efficient and easy to control and maintain. By using the series, companies can save costs because fewer resources are wasted. Typical areas of application are pneumatic conveyor systems and centralised vacuum systems. Here, the oil-free, air-cooled DZS 600 VSD+ and DZS 1200 VSD+ series operate extremely reliably over a long service life.

"The DZS VSD+ are simple and modular in design," explains Ahmed Elshaffie, the product manager responsible. They consist of the pump and gear chambers, which are separated by seals. Their energy-efficient, low-wear operation is based on a special coating of the wetted parts and rotors as well as on their simple operating principle. Two claws rotate without contact in opposite directions in the pump housing. This draws air into the pump chamber, compresses it and expels it again under pressure. In the gear chamber, two gear wheels synchronise the rotation of the claws. The non-return valve in the inlet flange prevents air from flowing back into the vacuum chamber when the pump is switched off. The pumps are driven directly by a flange-mounted motor via a coupling.

With their integrated VSD+ inverter drive with pressure setpoint control, the vacuum pumps can be operated at high rotor speeds. The motor speed adapts to the process load in an energy-efficient manner. "The DZS 600 VSD+ and DZS 1200 VSD+ models can be operated continuously at ultimate vacuum without overheating," adds Elshaffie. Another advantage is their variable use, as the compact pumps require little installation space in rough vacuum applications.