Pneumatic suction device

Abstract

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 ).

1 . A pneumatic suction device comprising: 
 a main nozzle through which the expansion of a compressed gas generates by reaction a suction of a first flow and a first vacuum;    at least a secondary nozzle through which the expansion of compressed gas generates by reaction a suction of a second flow and a second vacuum; the first flow being greater than the second flow and the second vacuum being greater than the first vacuum, the secondary nozzle being movable between a passive position, in which the effective expansion of the compressed gas is achieved by the main nozzle and an active position, in which the effective expansion of the compressed gas is achieved by the secondary nozzle.    
   
   
       2 . The pneumatic suction device according to  claim 1 , wherein the main nozzle and the secondary nozzle are coaxial, the secondary nozzle being movable along a translation axial relative to the main nozzle.  
   
   
       3 . The pneumatic suction device according to  claim 1 , further including a displacement means which moves the secondary nozzle between its passive position and its active position.  
   
   
       4 . The pneumatic suction device according to  claim 3 , wherein the displacement means comprises: 
 a pneumatic cylinder which moves the secondary nozzle between its passive position in which the secondary nozzle is disposed away from the main nozzle and its active position in which the secondary nozzle is disposed appreciably inside the main nozzle.    
   
   
       5 . The pneumatic suction device according to  claim 4 , wherein the pneumatic cylinder is equipped with a hollow stem comprising, on the one end, an inlet opening communicating with a conduit for supplying the compressed gas, and on the other end, an exhaust nozzle disposed directly in the secondary nozzle.  
   
   
       6 . The pneumatic suction device according to  claim 1 , further including: 
 control means for controlling in the two directions the activation of the displacement means.    
   
   
       7 . The pneumatic suction device according to  claim 6 , wherein the control means determine the vacuum generated inside of the pneumatic suction device.  
   
   
       8 . The pneumatic suction device according to  claim 6 , wherein the control means automatically control the activation of the displacement means when the vacuum inside the pneumatic suction device reaches a predetermined threshold value.  
   
   
       9 . The pneumatic suction device according to  claim 1 , further including a single source of energy consisting of compressed air.  
   
   
       10 . A suction device comprising: 
 a venturi region in communication with a waste collection region;    a first nozzle fixedly mounted adjacent the venturi region;    a second nozzle movably mounted adjacent the venturi region for movement between a first position in which the first and second nozzles interact to create a venturi effect between the first and second nozzles and a second position in which the venturi effect is created at a compressed air inlet side of the second nozzle;    a compressed air supply which supplies compressed air to the second nozzle inlet side in both the first and second positions.