| 摘要 |
The invention concerns a process and a device ( 2 ) for the pneumatic conveyance of powdered material ( 4 ), in which a cylindrical chamber ( 10, 12 ), which can be connected with a reservoir ( 6 ) by a sealable inlet ( 14, 16 ) and with a delivery line ( 28 ) by a sealable outlet ( 18, 20 ), is alternately filled with material from the reservoir ( 6 ) and emptied of this material by applying a negative pressure to the chamber with its outlet ( 18, 20 ) closed and its inlet ( 14, 16 ) open through a bordering wall formed by a gas-permeable filter element ( 50 ) to draw material into the chamber ( 10, 12 ) from the reservoir ( 6 ), and by then admitting a gas under pressure into the chamber ( 10, 12 ) with its inlet ( 14, 16 ) closed and its outlet ( 18, 20 ) open to force the material previously drawn into the chamber ( 10, 12 ) out of the chamber and into the delivery line ( 28 ). To prolong the service life of the filter element ( 50 ) and to avoid contamination of the filter element more easily, it is proposed, in accordance with the invention, that the filter element ( 50 ) be designed as a hollow cylinder and that it surround at least a portion of the chamber ( 10, 12 ).
|
