Importance

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Abstract

A hermetic refrigeration compressor has a tubular casing closed at each end by suitable caps and in which a cylinder block and motor stator are held by a press-fit. The cylinder block carries a crankshaft that is centrally located by a pair of axially-spaced bearings and defining a central space within which is mounted a connecting rod and piston. The piston has two portions, one on either side of the crankshaft, connected together by a pair of arms that extend around the crankshaft. One end of the piston slides within a pumping cylinder, while the other end of the piston to which the connecting rod is connected through a wrist pin, slides in a guide bore. This arrangement gives a slow reversal at the end of the compression stroke and a fast reversal at the end of the suction stroke. A segmental-shaped cylinder head is fitted to match a planar face on the cylinder block at the end of the pumping cylinder. The cylinder head has a central discharge valve and opening, and an annular suction space connected to the pumping cylinder by a plurality of suction ports. The suction and discharge lines are connected directly to the casing and have external mufflers to reduce sound propagation.

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First Claim