ScrewLine vacuum pumps are dry compressing backing pumps, the operation of which is based on the screw principle. The pumping chamber of the pump is formed by two synchronised positive displacement rotors and the housing enclosing these. Since the rotors rotate in opposite directions, the chambers move steadily from the intake to the exhaust side of the pumps thereby resulting in a smooth pumping action (see figure below). Since with a single ScrewLine rotor pair a multistage compression process is implemented, the component count in the pumping path is very low. In this way maintenance and servicing work is much simplified.
Properties The direct pumping path without multiple deflections for the medium make the ScrewLine vacuum pumps highly insensitive to foreign materials. This ensures a high uptime in industrial processes.
The two shaft-sealed non-contacting and thus practically wear-free, which allows for very long maintenance intervals.
For standard applications no purge gas is required. However, a purge gas supply can be connected as an option to purge the seals, should the application process require this. Because of the cantilevered bearing arrangement for the ScrewLine rotors, a potential source of failure (i.e. a bearing on the intake side) is entirely eliminated. On the one hand, no lubricants from the bearings can enter into the vacuum process, and the other hand also an impairment of the bearing by aggressive process media can be excluded.
A further benefit of the cantilevered bearing arrangement is the easy accessibility of the pump chamber. This innovative design feature allows the removal of the pump housing without time-consuming and costly disassembly of the bearings. Thus on-site cleaning of all surfaces in contact with the medium is possible. In particular, if the processes involved considerable amounts of contaminants this is a significant advantage which ensures a long uptime.
Besides the integrated oil cooling arrangement for the rotors, the ScrewLine pumps are air-cooled from the outside. Here rotor and housings are thermally linked via the oil cooler. Thus ScrewLine pumps adapt themselves ideally to the ambient conditions under changing operating situations.
A water-cooled version is offered as ScrewLine SP630 F. This product version is intended for operation in air-conditioned rooms. The ScrewLine offer is completed through ATEX-certified variants.
