| 摘要 |
A pneumatic suction device ( 1 ) comprises a main nozzle ( 10 ), through which the expansion of compressed gas is designed to generate, by means of a reaction, suction with a given vacuum and flow rate. At least one secondary nozzle ( 20 ), through which the expansion of the compressed gas is designed to generate, by means of a reaction, suction with a lower flow rate and a higher vacuum that those obtained with the main nozzle ( 10 ). Each secondary nozzle ( 20 ) is mounted to move between a passive position, in which the effective expansion of the compressed gas is performed by the main nozzle ( 10 ) and an active position, in which the effective expansion of the compressed gas is performed by the secondary nozzle ( 20 ).
|
