Vacuum generator
The vacuum quantity, the vacuum level and the possible energy supply with electricity or compressed air on site are decisive for the choice of vacuum generator. In pneumatic vacuum generation with an ejector, the vacuum is generated with compressed air. A power supply is not necessary. Vacuum blowers deliver a large volume flow with a low ultimate vacuum. Rotary vane pumps generate a high ultimate vacuum with a low volume flow. The generation of vacuum is mainly divided into the following areas. Detailed descriptions of the vacuum generators and how they work can be found here.
Criteria for selecting the vacuum generator
The use of a rotary vane pump or an ejector is recommended for smooth, dense materials. A vacuum blower should be used for porous or large volumes of air. The vacuum generator can be made smaller by using a vacuum accumulator.
The ratio between energy consumption and load capacity is best between 60 % and 80 %. To increase the load capacity, the suction surface should be increased if possible (e.g. by selecting a larger suction plate).
Vacuum accumulators
Vacuum accumulators are safety devices for a sudden power failure so that the load does not drop immediately but remains sucked in for some time. The ratio between the storage volume and the residual volume (internal volume of the suction cups, hose volume and pipework) is decisive for the design of the vacuum accumulator. On the one hand, the accumulator must supply the vacuum for the suction cups during suction and, on the other hand, maintain the vacuum if the vacuum generator fails.
