Refrigerant compressors

Claim 1

In a refrigerant compressor unit comprising a compressor housing, a cylinder block mounted therein and having a plurality of cylinders, a plurality of piston means respectively slidably received within said plurality of cylinders, means for driving said piston means within said cylinders to compress refrigerant gas therein, said compressor housing having a first chamber adjacent said cylinder block for containing said driving means, a cylinder head having a suction chamber and a discharge chamber which operatively communicate with said cylinders, and a gas passageway communicating between said first chamber and said suction chamber to return blow-by gas in said first chamber to said suction chamber, the improvement which comprises: partitioning means for separating said discharge chamber of said cylinder head into first, second and third chamber portions, said first chamber portion communicating with said cylinders, said second chamber portion communicating with an outlet port to be connected to an external gas-circulating system and communicating with said first portion through a first opening formed in said partitioning means therebetween, means disposed to cover said first opening of said partitioning means for separating oil from the compressed gas flowing therethrough, said third chamber portion having a second upper opening in said partitioning means and disposed below said oil separating means to cover said second opening therewith for directly receiving and accumulating oil separated by said oil separating means, and an oil passageway communicating between said third chamber portion and said first chamber for returning the separated oil to said first chamber.