VACUUM GENERATOR

摘要

A vacuum producing device ( 1 ) possessing a principal suction nozzle unit ( 2 ) with a shut off valve ( 27 ) on the upstream side thereof and an additional suction nozzle unit ( 3 ) connected in parallel to the principal suction nozzle unit ( 2 ). While the supply of pressure medium for the principal suction nozzle unit ( 2 ) is controlled in a manner dependent on the negative pressure produced by controlling the shut off valve ( 27 ), the additional suction nozzle unit ( 3 ) remains ( 3 ) constantly in operation. This means that a complete build up of vacuum may be ensured in conjunction with a complete switching off of the principal suction nozzle unit ( 2 ) together with a resulting air economizing effect.