Five-bar compressor

Abstract

The invention is a 180° reciprocating piston compressor comprising additional eccentric disc linkage between the crankpin and the connecting rod. The additional linkage lessens the compression above the piston during start-up and limits the electrical motor shaft load at design operating conditions lowering the starting current surge when bringing the system up to starting speeds. The additional disc eccentric linkage also lessens the torque load on the motor during motor normal operating speed.

1 . An opposed two cylinder compressor having a 180° opposed two-throw crankshaft rotatively mounted in a crankcase, said crankshaft comprising a main shaft, two aligned crank arms fixedly attached to a crankpin, a second crankpin fixedly attached to the outer surface of one crank arm forming a second crank throw, said main shaft fixedly attached to the outer surface of the other crank arm, said crankpins and said main shaft axial centers are in parallel alignment, adjacent and below each of the said crankpins a constraining pin fixedly mounted on the said crank arms, eccentric discs having a constraining slot in which the said constraining pins are slidably mounted, said eccentric discs having a crankpin bore hole for rotatively mounting on said crankpins, said eccentric discs rotatively mounted on one end of a connecting rod, said connecting rod rotatively mounted on each of the said crankpins, the other end of each of the two said connecting rods pivotally mounted within pistons, each said piston slidably mounted in said opposed cylinders, said cylinders closed at one end by a head, a valve plate positioned between each said cylinder and each said head. 
   
   
       2 . The compressor of  claim 1  having four opposed cylinders positioned in-line on the same horizontal plane, a second 180° opposed two-throw crankshaft fixedly attached to the said crankshaft of  claim 1  by a mainshaft, said second crankshaft, having an aft main journal. 
   
   
       3 . The compressor of  claim 1  having four cylinders, said four cylinders arranged in two sets of opposed cylinders in which the opposing lines are perpendicular, said perpendicular arrangement positions each cylinder in 90° quadrants about the axial center of crankshaft rotation.