Patent ID: 7354469

Claim:
Vacuum conveyor device ( 10 ) with a multi-stage filter system, which comprises at least one inner filter ( 10 A), at least one outer filter ( 10 B), and a filter adapter ( 20 ) for air-tight and/or fluid-tight insertion of at least one of the filters, for which the outer filter is arranged upstream of the inner filter, wherein: the filter adapter ( 20 ) is a multi-component assembly, comprising a first filter adapter part ( 20 A) and a second filter adapter part ( 20 B); the at least one inner filter ( 10 A) is adapted to be used as a carrier unit for the outer filter ( 10 B) and also as a safety filter; the at least one outer filter ( 10 B) is adapted to function as a working filter and can be drawn onto or into the inner filter ( 10 A) in a detachable replaceable manner; the first filter adapter part ( 20 A) directly connects the outer filter ( 10 B) in a sealing manner to the second filter adapter part ( 20 B); the inner filter is connected to the second filter adapter part ( 20 B); and said first and second filter adapter parts ( 20 A, 20 B) are directly connected to each other and are directly sealed together in an air-tight manner such that said inner filter ( 10 A) carries the outer filter ( 10 B).