A COMPRESSOR ASSEMBLY

摘要

A scotch yoke compressor assembly is disclosed wherein four radially disposed pistons (96) reciprocate in cylinders defined in a crankcase (46). In a central portion of the crankcase, a scotch yoke mechanism operably couples the pistons to an eccentric portion on a rotating crankshaft (32). Each piston includes suction ports extending therethrough and a suction valve (116) on the piston head. The suction valve is operably retained on a piston head and the piston is attached to a yoke member by a single bolt (124). The bolt head is received within a recess (140) coined in a valve plate (136) interposed between the crankcase and a cylinder head cover. Circularly arranged discharge ports (143) in the valve plate are opened and closed by an annular discharge valve (146) guidedly retained against the valve plate at diametrically opposed locations, by a combination of guide pins (145) and an annular retainer member (148). The retainer member rides on the guide pins and is biased against the cylinder head cover and the discharge valve to permit extended lift during high mass flow rates and slugging.