New high-performance multiple dry claw vacuum pump

The DZM system is designed for use in a wide variety of dry pumping applications, from packaging lines, pneumatic conveyors and clamping systems for CNC machines, through to moulding machines, drying processes and central vacuum supply systems. Dry claw vacuum pumps use two claw-shaped rotors running in opposite directions that do not touch each other or the pump chamber. This simple principle results in high performance and energy efficiency.

This also applies to the DZM system, which combines between two and four DZS claw vacuum pumps, depending on the application, in a single compact housing. Atlas Copco's sturdy, durable DZS pumps are single-stage oil-free machines with air cooling. They require very little maintenance, even in arduous conditions. One of the pumps in each DZM system has a variable-speed drive, enabling the vacuum to be adapted precisely to the customer's requirements. This dramatically improves efficiency by reducing the power required and total cost of ownership.

Choice of sizes

The space-saving vacuum system is available in three sizes: DZM 600 VSD, DZM 900 VSD and DZM 1200 VSD, with intake volume flows of between 112 and 1230m3/h. As with individual DZS claw pumps, the DZM system can create a vacuum level up to 140 mbar(a).

The standard features of DZS pumps include stainless steel claws and a corrosion-resistant pump chamber, allowing reliable operation even under difficult conditions. Richard Oxley, Vacuum Product Manager for Atlas Copco UK, comments: "Process gases flow continuously through vacuum pumps, which may result in premature failure of the pump. It is therefore very important to select suitable materials and coatings."

Dry claw technology,as used in the DZS series, also offers the advantage that, despite the very tight clearances between rotors and casing, there is no contact between these components and the pump is therefore virtually free from wear. The result is a reliable pump combining longevity with minimum maintenance expenses. Thanks to details such as an integrated exhaust silencer, DZS pumps are also among the quietest dry claw pumps on the market, contributing to a pleasant working atmosphere.

Oxley adds: "Our new DZM multiple pump system is based on the simple design principles of our compressors. We install our high-performance DZS pumps inside a noise-reducing enclosure and offer our customers a solution that is both compact and intelligent." The sturdy housing protects the pumps, reduces noise levels and heat and contains all the technology required for operation in a single box. In order to protect the heat-sensitive electronics, 'hot' and 'cold' components are installed separately from each other. The side walls are removable for rapid access and easier maintenance.

User interface

The user interface features the tried-and-tested Elektronikon controller from Atlas Copco, which is integrated in the front panel. The controller operates the multiple dry claw pump system and ensures that the individual pumps are harmonised with each other in operation. The vacuum level is automatically monitored within the system and matches the process duty point. Accurate control is maintained with the variable-speed drive working in conjunction with the cascade control of the remaining pumps. Lag pumps rotate duty on a regular basis to even usage, especially when redundancy is built in to the system, for example, in time of maintenance shut-downs.

Information on pump status, system capacity, system pressure, energy efficiency, special events and maintenance status can be called up on the display and also transmitted via communication modules, if the customer wishes so. "The user receives a plug-and-play solution which is easy to install and handle, says Oxley. "Our multiple pump system is compact, easy to transport, space-saving and less costly than alternative technologies which need to be assembled and installed at the customer's plant."

For more information about Atlas Copco's new high-performance multiple dry claw vacuum pump go to www.atlascopco.co.uk.