Pneumatic suction device, pneumatic sanding system implementing such a device and corresponding facility

Abstract

A pneumatic suction device including a suction nozzle connected to a suction unit and at least one air amplification module located in at least one hose for connecting said suction nozzle to the suction unit. The at least one air amplification module includes at least two air amplifiers operating according to a Coanda effect.

1 . A pneumatic suction device comprising:
 a suction unit;   a suction nozzle connected to the suction unit; and   at least one air amplification module located in at least one hose for connecting said suction nozzle to said suction unit, wherein said at least one air amplification module comprises at least two air amplifiers operating according to a Coanda effect, said at least two air amplifiers being disposed in parallel within said at least one amplification module.   
     
     
         2 . The pneumatic suction device according to  claim 1 , wherein said at least one amplification module comprises a base having at least two first bores, called air inlet bores, extending through said base. 
     
     
         3 . The pneumatic suction device according to  claim 2 , wherein said at least one amplification module comprises a body in which said at least two air amplifiers are formed at least in part, said body comprising for each of said at least two air amplifiers:
 a second bore, called air outlet bore, substantially circular or conical, extending from a first side of said body oriented towards said suction nozzle;   a fillet, extending said outlet bore and making junction between walls of said outlet bore and a surface opposite to said first side of said body;   said at least one amplification module comprising, for each of said at least two air amplifiers, a slot adjacent to said fillet, said slot being configured to enable an additional air intake in said air amplifier.   
     
     
         4 . The pneumatic suction device according to  claim 3 , wherein said slot is configured to enable a compressed/pressurised air intake. 
     
     
         5 . The pneumatic suction device according to  claim 3 , wherein said slot is in fluid communication with said first bore and/or said fillet and with a pressurised air chamber. 
     
     
         6 . The pneumatic suction device according to  claim 3 , wherein said slot has a width comprised between 0.05 millimeters (mm) and 0.1 mm. 
     
     
         7 . The pneumatic suction device according to  claim 3 , wherein said fillet has an opening comprised between 1 millimeter (mm) and 5 mm. 
     
     
         8 . A sanding system for a car body workshop, comprising:
 a pneumatic suction device comprising:
 a suction unit; 
 a suction nozzle connected to the suction unit; and 
 at least one air amplification module located in at least one hose for connecting said suction nozzle to said suction unit, wherein said at least one air amplification module comprises at least two air amplifiers operating according to a Coanda effect, said at least two air amplifiers being disposed in parallel within said at least one amplification module; and 
   a pneumatic sander connected to the pneumatic suction device.   
     
     
         9 . A facility comprising:
 a general compressed air supply network; and   at least one sanding system connected to the general compressed air supply network and comprising:
 a pneumatic suction device comprising:
 a suction unit; 
 a suction nozzle connected to the suction unit; and 
 at least one air amplification module located in at least one hose for connecting said suction nozzle to said suction unit, wherein said at least one air amplification module comprises at least two air amplifiers operating according to a Coanda effect, said at least two air amplifiers being disposed in parallel within said at least one amplification module; and 
 
 a pneumatic sander connected to the pneumatic suction device.