Patent ID: 6129532
Filing Date: 2000-10-10
Classification: F04B,F04C,F25B

Abstract:
A CO.sub.2 compressor for compressing the CO.sub.2 gas used in the refrigeration cycle of an air-conditioning system using CO.sub.2 as a refrigerant, comprising:a housing for covering at least the main parts;a fixed member integrated with said housing and remaining stationary;a movable member slidable relatively with said fixed member for forming at least one working chamber as a space with said fixed member for compressing the refrigerant, said movable member being driven for expanding or compressing said working chamber;separation means formed for separating the lubricant mixed with the refrigerant from the refrigerant discharged;a lubricant tank connected with said separation means for storing the separated lubricant under pressure;at least one oil path extending from said oil tank toward said parts requiring lubrication for sending said lubricant forced by the pressure of the refrigerant on the discharge side from said oil tank to said parts; andan intermittent oil supply mechanism in which a part of said oil path open to the surface of said fixed member is opened or closed by said movable member thereby to allow the lubricant to be passed intermittently under pressure to said parts requiring lubrication from said oil tank.