Patent ID: 8800306

Claim:
A portable refrigerant recovery machine, comprising: a manifold having an inlet valve to receive refrigerant into the machine and an outlet valve for exiting the refrigerant from the machine; a compressor that receives the refrigerant from the manifold and compresses the refrigerant, the compressor further comprising: a first head that receives a first end of a first cylinder and includes a first head inlet and a first head outlet; a second head that receives a first end of a second cylinder and includes a second head inlet and a second head outlet; a crankcase coupled to second ends of the first and second cylinders; a crankshaft positioned within the crankcase, the crankshaft having an axis of rotation, and the crankshaft comprises a single crankshaft journal connected to a first end of a first connecting rod and a first end of a second connecting rod such that the first end of the first connecting rod and the first end of the second connecting rod move in unison; a first pin that couples a second end of the first connecting rod to a first end of a first piston; and a second pin that couples a second end of the second connecting rod to a first end of a second piston, wherein the first piston and the second piston are opposed and off-set from each other along the axis of rotation of the crankshaft, and the first and second pins allow connecting rods to rotate around the pins, and wherein the first piston and the second piston comprise at least one of an O-ring and a wear band; a motor coupled with the crankshaft to move the pistons; a condenser to condense the refrigerant; a housing to house the manifold, the compressor, the motor and the condenser; a purge valve control configured to control a purge valve; a first control to control the functionality of an inlet fitting; a second control to control the functionality of an outlet fitting; the housing having a front portion with the purge valve control, the first control, and the second control arranged on the front portion; a fan; and an accessory shaft to receive the fan, wherein the accessory shaft and the fan have an axis of rotation the same as the axis of rotation of the crankshaft.