Improved volumetric compressor

Abstract

A compression device compresses a gas by means of a compression fluid includes a compression chamber for the generation of a compressed mixture of the gas and the compression fluid. A first driving compression rotor and a second compression rotor mesh with each other and are housed inside the compression chamber. The first driving rotor includes an end that projects from a wall of the compression chamber. A power source includes a transmission shaft suited to be set rotating by the power source. A transmission unit is interposed between the power source and the first driving rotor in such a way as to transmit the rotation of the transmission shaft to the first driving rotor. Containment means define a housing chamber to house the transmission unit. The wall of the compression chamber is at least partially defined by a wall of the containment means of the transmission unit.

1 . A compression device ( 1 ) suited to compress a gas by means of a compression fluid, said compression device ( 1 ) comprising:
 a compression chamber ( 2 ) for the generation of a compressed mixture of said gas and said compression fluid;   a first driving compression rotor ( 6   mc ) and a second compression rotor ( 6   fc ) mutually meshing with each other and housed inside said compression chamber ( 2 ), said first driving compression rotor ( 6   mc ) comprising an end ( 66 ) that serves for moving it and projects from a wall ( 50   b ) of said compression chamber ( 2 );   a power source ( 6 ) comprising a transmission shaft ( 6   a ) suited to be set rotating by said power source ( 6 );   a transmission unit ( 6   c,    6   m ) interposed between said power source ( 6 ) and said first compression driving rotor ( 6   mc ) in such a way as to transmit the rotation of said transmission shaft ( 6   a ) to said first driving compression rotor ( 6   mc );   containment means ( 50 ) that define a housing chamber ( 50   i ) suited to house said transmission unit ( 6   c,    6   m ), wherein said wall of said compression chamber ( 2 ) is at least partially defined by a wall ( 50   b ) belonging to said containment means ( 50 ) of said transmission unit ( 6   c,    6   m ).   
     
     
         2 . The device according to  claim 1 , wherein said transmission unit comprises one or more transmission gears ( 6   c,    6   m ). 
     
     
         3 . The device according to  claim 2 , wherein said transmission gears comprise a first gear ( 6   m ) fixed to one end of said transmission shaft ( 6   a ) and a second gear ( 6   c ) fixed to one end ( 66 ) of said first driving compression rotor ( 6   mc ), said first and said second gear ( 6   m,    6   c ) mutually meshing with each other. 
     
     
         4 . The device according to  claim 3 , wherein said first and said second gear ( 6   c,    6   m ) define a transmission ratio that is different from a transmission ratio between said transmission shaft ( 6   a ) and said driving rotor ( 6   mc ). 
     
     
         5 . The device according to  claim 1 , wherein said transmission unit comprises a joint. 
     
     
         6 . The device according to  claim 1 , wherein said end ( 66 ) of said first driving compression rotor ( 6   mc ) is partially housed in a through hole ( 60 ) obtained in said wall ( 50   b ). 
     
     
         7 . The device according to  claim 6 , further comprising sealing means ( 80 ) interposed between said through hole ( 60 ) and said end ( 66 ) of said first driving compression rotor ( 6   mc ) in such a way as to guarantee the fluid-dynamic separation between said compression chamber ( 2 ) and said housing chamber ( 50   i ) of said transmission unit ( 6   c,    6   m ). 
     
     
         8 . The device according to  claim 7 , wherein said sealing means ( 80 ) comprise a sealing element ( 81 ) comprising at least one elastic portion ( 82   a,    82   b ) suited to be placed in contact with the outside of said end ( 66 ) of said first driving compression rotor ( 6   mc ). 
     
     
         9 . The device according to  claim 8 , further comprising an annular element ( 83 ) interposed between said sealing element ( 81 ) and said end ( 66 ) of said first driving compression rotor ( 6   mc ). 
     
     
         10 . The device according to  claim 1 , further comprising supporting and rolling means ( 70 ) interposed between said through hole ( 60 ) and said end ( 66 ) of said first driving compression rotor ( 6   mc ), said supporting and rolling means ( 70 ) being housed in said wall ( 50   b ). 
     
     
         11 . The device according to  claim 10 , wherein said supporting and rolling means ( 70 ) comprise a roller bearing ( 71 ). 
     
     
         12 . The device according to  claim 1 , wherein said containment means ( 50 ) are provided with an opening ( 51 ) suited to house and be coupled with a portion ( 160 ) of said power source ( 6 ) from which said transmission shaft ( 6   a ) projects. 
     
     
         13 . The device according to  claim 1 , wherein said housing chamber ( 50   i ) of said transmission unit ( 6   c,    6   m ) is suited to receive lubricating oil (O) for said transmission unit ( 6   c,    6   m ). 
     
     
         14 . The device according to  claim 1 , wherein said containment means ( 50 ) are obtained by assembling a plurality of component parts. 
     
     
         15 . The device according to  claim 1 , wherein said power source ( 6 ) includes an electric motor.