Apparatus for regulated delivery of a gas, in particular breathing apparatus

Abstract

This apparatus ( 1 ) includes an air intake duct, a volute ( 5 ) of which the inlet opening ( 22 ) communicates with the air intake duct, a first vane rotor ( 4 ) located immediately downstream of the inlet opening ( 22 ) of the volute ( 5 ), a motor ( 3 ) for driving the rotor ( 4 ), and a motor ( 3 ) for rotating the rotor ( 4 ) in order to generate a centrifugal air flow in the volute ( 5 ). The apparatus further includes: a casing ( 2 ) having a tubular portion ( 10 a ) located at a substantially constant distance from the motor ( 3 ), the casing ( 2 ) and the motor ( 3 ) thereby together bounding a gas flow passage ( 15 ) including at least one gas inlet orifice ( 20 ) and at least one gas outlet orifice ( 16 ); and a second vane rotor ( 6 ) located downstream of the gas inlet orifice ( 20 ) rotated in order to generate a forced gas stream in the gas flow passage ( 15 ).

1 . An apparatus ( 1 ) for regulated delivery of a gas, in particular breathing apparatus, comprising an air intake duct, a volute ( 5 ) of which the inlet opening ( 22 ) communicates with the air intake duct, a first vane rotor ( 4 ), located immediately downstream of the inlet opening ( 22 ) of the volute ( 5 ), comprising an inlet opening connected to this inlet opening ( 22 ) of the volute ( 5 ) and outlet orifices opening into the volute ( 5 ), and a motor ( 3 ) for rotating the rotor ( 4 ) in order to generate a centrifugal air flow in the volute ( 5 ), characterized in that it comprises:
 a casing ( 2 ) having a tubular portion ( 10   a ) of which the wall is intended to extend, after assembly, around the motor ( 3 ) and remaining at a substantially constant distance from this motor ( 3 ), the casing ( 2 ) and the motor ( 3 ) thereby together bounding a gas flow passage ( 15 ) comprising at least one gas inlet orifice ( 20 ) and at least one gas outlet orifice ( 16 ); and   a second vane rotor ( 6 ) located downstream of said gas inlet orifice ( 20 ), rotated in order to generate a forced gas stream in said gas flow passage ( 15 ).   
   
   
       2 . The apparatus ( 1 ) as claimed in  claim 1 , characterized in that said second vane rotor ( 6 ) is placed on a shaft driven by the motor ( 3 ). 
   
   
       3 . The apparatus ( 1 ) as claimed in  claim 1 , characterized in that the casing ( 2 ) comprises a plurality of gas outlet orifices ( 16 ) distributed on the circumference of this casing ( 2 ), and in that the casing ( 2 ) comprises a circular chamber ( 7 ) arranged at these gas outlet orifices ( 16 ) comprising a gas outlet manifold ( 23 ). 
   
   
       4 . The apparatus ( 1 ) as claimed in  claim 3 , characterized in that said circular chamber ( 7 ) forms a body with the casing ( 2 ). 
   
   
       5 . The apparatus ( 1 ) as claimed in  claim 1 , characterized in that said gas inlet orifice ( 20 ) opens directly onto the exterior of the casing ( 2 ). 
   
   
       6 . The apparatus ( 1 ) as claimed in  claim 1 , characterized in that the ventilation gas is air, said gas inlet orifice ( 20 ) opening directly onto the exterior of the casing ( 2 ). 
   
   
       7 . The apparatus ( 1 ) as claimed in  claim 1 , characterized in that it comprises a plate ( 25 ) traversed by the shaft of the motor ( 3 ), extending close to the wall of said first vane rotor ( 4 ) opposite the inlet ( 22 ) of the volute ( 5 ), and in that the casing ( 2 ) comprises orifices ( 17 ) causing communication between the side of this plate ( 25 ) opposite said first vane rotor ( 4 ) and said gas flow passage ( 15 ). 
   
   
       8 . The apparatus ( 1 ) as claimed in  claim 2 , characterized in that the casing ( 2 ) comprises a plurality of gas outlet orifices ( 16 ) distributed on the circumference of this casing ( 2 ), and in that the casing ( 2 ) comprises a circular chamber ( 7 ) arranged at these gas outlet orifices ( 16 ) comprising a gas outlet manifold ( 23 ). 
   
   
       9 . The apparatus ( 1 ) as claimed in  claim 8 , characterized in that said circular chamber ( 7 ) forms a body with the casing ( 2 ). 
   
   
       10 . The apparatus ( 1 ) as claimed in  claim 2 , characterized in that said gas inlet orifice ( 20 ) opens directly onto the exterior of the casing ( 2 ). 
   
   
       11 . The apparatus ( 1 ) as claimed in  claim 2 , characterized in that the ventilation gas is air, said gas inlet orifice ( 20 ) opening directly onto the exterior of the casing ( 2 ). 
   
   
       12 . The apparatus ( 1 ) as claimed in  claim 2 , characterized in that it comprises a plate ( 25 ) traversed by the shaft of the motor ( 3 ), extending close to the wall of said first vane rotor ( 4 ) opposite the inlet ( 22 ) of the volute ( 5 ), and in that the casing ( 2 ) comprises orifices ( 17 ) causing communication between the side of this plate ( 25 ) opposite said first vane rotor ( 4 ) and said gas flow passage ( 15 ).