Air Compressor

Abstract

An air compressor includes a cylinder housing with a piston slidably disposed in a compression chamber of the cylinder housing for generating pressurized air. The air compressor further includes an air drum receiving the cylinder housing and engaged with a flange extending outwardly from a peripheral wall of the cylinder housing. An expanded chamber for storage of the pressurized air is formed between the air drum and the cylinder housing and being in communication with the compression chamber of the cylinder housing. The expanded chamber has significantly larger volume which reduces resistance applied to the piston during reciprocation in the cylinder housing and increases air compression efficiency.

1 . An air compressor, comprising:
 a cylinder housing installed on a support and including a peripheral wall, a top wall, and an opening spaced from the top wall along a longitudinal axis, with the cylinder housing further including a compression chamber therein, with a piston slidably disposed in the compression chamber for generating pressurized air, with the top wall including a vent through which the pressurized air in the cylinder housing can be guided outwardly, and   an air drum receiving the cylinder housing and engaged with the peripheral wall of the cylinder housing, with the air drum including upper and lower ends spaced along the axis. with the upper end higher than the top wall of the cylinder housing along the axis, with the air drum further including a first segment below the top wall along the axis and a second segment above the top wall along the axis, with a first air storage chamber formed between the first segment and the peripheral wall of the cylinder housing, with a second air storage chamber formed in the second segment and in communication with the compression chamber of the cylinder housing through the vent, with an inner diameter of the second air storage chamber being greater than an outer diameter of the cylinder housing.   
     
     
         2 . The air compressor according to  claim 1 , with a length of the air drum along the axis being greater than a length of the cylinder housing along the axis, with a flange extending outwardly from the peripheral wall of the cylinder housing, and with the lower end of the air drum integrally coupled with the flange of the cylinder housing. 
     
     
         3 . The air compressor according to  claim 2 , with the top wall extending in a first horizontal direction perpendicular to the axis, and with the flange extending outwardly from a lower end of the peripheral wall and extending in a second horizontal direction perpendicular to the axis and parallel to the first horizontal direction. 
     
     
         4 . The air compressor according to  claim 2 , with the top wall extending in a first horizontal direction perpendicular to the axis, and with the flange located between the top wall and the opening of the cylinder housing along the axis and extending in a second horizontal direction perpendicular to the axis and parallel to the first horizontal direction. 
     
     
         5 . The air compressor according to  claim 2 , with an annular boss protruding outwardly from an outer surface of the top wall, with a cavity formed in the boss and in communication with the vent, with a valve seat movably accommodated in the cavity and having an outer diameter less than an inner diameter of the cavity but greater than an inner diameter of the vent, and with a gap formed between the valve seat and the boss. 
     
     
         6 . The air compressor according to  claim 5 , with the upper end of the air drum including an opening formed therein, with a top cap engaged to the upper end of the air drum, with the top cap including a protrusion post formed on an inner end surface thereof and extending toward the cylinder housing along the axis, and with a spring mounted around the protrusion post and between the top cap and the valve seat for biasing the valve seat toward the top wall of the cylinder housing. 
     
     
         7 . The air compressor according to  claim 6 , with an engagement flange extended outwardly from a periphery of the upper end of the air drum and provided with a plurality of positioning holes spaced in a peripheral direction thereof, with an annular groove formed in an outer end surface of the engagement flange, with the top cap provided with a plurality of positioning holes and an annular groove in an inner end surface of the top cap, with an annular rubber gasket mounted in the annular grooves of the engagement flange and the top cap, and with a plurality of bolts extending through the positioning holes in the top cap and the engagement flange to securely couple the top cap with the upper end of the air drum. 
     
     
         8 . The air compressor according to  claim 6 , with the boss having a length along the axis elongated until the inner end surface of the top cap, and with the boss provided with a through-hole for stream of the pressurized air. 
     
     
         9 . The air compressor according to  claim 6 , with a plurality of manifolds extended outwardly from the air drum and being in communication with the second air storage chamber of the air drum. 
     
     
         10 . The air compressor according to  claim 6 , with an air drum seat extended outwardly from the top cap and including an air channel therein, with a plurality of manifolds installed on the air drum seat, and with the air channel communicating the second air storage chamber of the air drum with the plurality of manifolds. 
     
     
         11 . The air compressor according to  claim 1 , with a length of the air drum along the axis being greater than a length of the cylinder housing along the axis, with the air drum further including an upper wall formed on the upper end thereof and an opening in the lower end thereof, with a flange extending outwardly from the peripheral wall of the cylinder housing, and with the lower end of the air drum detachably engaged with the flange of the cylinder housing. 
     
     
         12 . The air compressor according to  claim 11 , with the top wall extending in a first horizontal direction perpendicular to the axis, and with the flange extending outwardly from a lower end of the peripheral wall and extending in a second horizontal direction perpendicular to the axis and parallel to the first horizontal direction. 
     
     
         13 . The air compressor according to  claim 12 , with a plurality of manifolds extended outwardly from the air drum and being in communication with the second air storage chamber of the air drum. 
     
     
         14 . The air compressor according to  claim 13 , with the flange of the cylinder housing provided with a plurality of positioning holes and an annular groove in an inner end surface of the flange, with an engagement flange extending outwardly from the lower end of the air drum and provided with a plurality of positioning holes and an annular groove in an inner end surface of the engagement flange, with an annular rubber gasket mounted in the annular grooves of the flange and the engagement flange, and with a plurality of bolts extending through the positioning holes in the flange and the engagement flange to securely engage the air drum with the cylinder housing. 
     
     
         15 . The air compressor according to  claim 14 , with an annular boss protruding outwardly from an outer surface of the top wall, with a cavity formed in the boss and in communication with the vent, with a valve seat movably accommodated in the cavity and having an outer diameter less than an inner diameter of the cavity but greater than an inner diameter of the vent, with a gap formed between the valve seat and the boss, with the air drum further including a protrusion post extending downward from the upper wall thereof, and with a spring mounted around the protrusion post for biasing the valve seat toward the top wall of the cylinder housing.