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Vacuumpump - Function principle and how it works

Busch R 5 vacuum pumps are used to suck air rapidly out of the packaging chamber and to generate the
greatest possible vacuum.

Inside the vacuum pump there is a rotor (1) with vanes (2). As a result of the turning motion of this rotor, air is sucked in, compressed and expelled. During this process, oil is continually being injected (3), in order to seal
the vacuum pump, to cool it and to lubricate it. The oil is expelled together with the extracted air as a mixture, into what is called the oil mist separator (4) and there they are again separated. An ingenious separation system in the oil mist separator with a filter (5) ensures that only clean air comes out of the vacuum pump, and that the oil
is returned to the oil circuit. The vacuum pump is air-cooled and is driven by an electric motor.

The time needed by the vacuum pump to suck out of the air from the packing chamber depends on the size of
the vacuum pump (its suction capacity). Moist air or water vapour from the material in the packaging chamber
also affects the time required (evacuation time). The built-in gas ballast valve (6) prevents any condensation of moisture in the vacuum pump, and thereby ensures safe operation.

Dr.-Ing. K. Busch GmbH
Uli Merkle, 18 March 2005