Compressed-air compressor

Abstract

A compressed-air compressor, the compressor having a cylinder; a piston mounted to slide along the cylinder and define, inside the cylinder, a variable-volume compression chamber; and an actuator assembly connected to the piston to impart to the piston a reciprocating travel, along the cylinder, between a top dead centre position and a bottom dead centre position; the actuator assembly having a belt drive; and the cylinder having a vent hole formed, at most, at 60 % of the travel of the piston, measured from the top dead centre position.

1 ) A compressed-air compressor, the compressor ( 1 ) comprising a cylinder ( 17 ); a piston ( 24 ) mounted to slide along the cylinder ( 17 ) and define, inside the cylinder ( 17 ), a variable-volume compression chamber ( 26 ); and actuating means ( 28 ) connected to the piston ( 24 ) to impart to the piston ( 24 ) a reciprocating travel (D), along the cylinder ( 17 ), between a top dead centre position and a bottom dead centre position; the actuating means ( 28 ) comprising a belt drive ( 13 ); and the compressor ( 1 ) being characterized in that the cylinder ( 17 ) has a vent hole ( 36 ) formed, at most, at 60% of the travel (D) of the piston ( 24 ), measured from the top dead centre position. 
     
     
         2 ) A compressor as claimed in  claim 1 , wherein the vent hole ( 36 ) in the cylinder ( 17 ) is formed at 40-60% of the travel (D) of the piston ( 24 ), measured from the top dead centre position. 
     
     
         3 ) A compressor as claimed in  claim 1 , wherein the vent hole ( 36 ) in the cylinder ( 17 ) is formed at 53% of the travel (D) of the piston ( 24 ), measured from the top dead centre position. 
     
     
         4 ) A compressor as claimed in  claim 1 , wherein the actuating means ( 28 ) comprise a support ( 2 ); a motor ( 6 ) fitted to the support ( 2 ) and having an output shaft ( 5 ); and said belt drive ( 13 ), which comprises a first pulley ( 7 ) fitted to the output shaft ( 5 ), a second pulley ( 11 ) fitted in rotary manner to the support ( 2 ), and an endless belt ( 12 ) looped about the first and second pulley ( 7 ,  11 ). 
     
     
         5 ) A compressor as claimed in  claim 4 , wherein the actuating means ( 28 ) also comprise a connecting rod-crank mechanism ( 29 ) for converting rotation of the first pulley ( 7 ) to a reciprocating movement of the piston ( 24 ), along the cylinder ( 17 ), between the bottom and top dead centre positions; the second pulley ( 11 ) defining a crank of the connecting rod-crank mechanism ( 29 ).