Patent ID: 6257840
Filing Date: 2001-07-10
Classification: F04C

Abstract:
A compressor comprising:a shell defining a suction pressure zone and a discharge pressure zone;a compressing mechanism disposed within said shell, said compressing mechanism defining at least one compression chamber for compressing a gas;a low pressure lubricant sump disposed within said shell;a high pressure lubricant sump disposed within said shell;a lubricant flow path for supplying lubricant from said high pressure lubricant sump to said compression chamber;a first lubricant separator disposed within said shell, said first lubricant separator being operative to separate lubricant from said compressed gas and returning said lubricant to said high pressure lubricant sump;a fluid passage extending between said discharge pressure zone and said suction pressure zone; anda device disposed within said fluid passage, said device controlling gas pressure within said discharge pressure zone by controlling fluid flow from said discharge pressure zone to said suction pressure zone through said fluid passage.