Patent ID: 7293970

Claim:
A two-stage rotary compressor disposed in a closed vessel, the compressor comprising: a motor-drive element disposed in an upper portion of the closed vessel, and having a rotating shaft; and a rotary compressing element disposed in a lower portion of the closed vessel, and driven by the rotating shaft of said motor-drive element, the rotary compressing element including: a partition plate having a vent hole, a low stage side rotary compressing element that is positioned on an upper side of said partition plate, and a high stage side rotary compressing element that is positioned on a lower side of said partition plate-opposite to said upper side, a discharge path for intermediate pressure refrigerant compressed by the low stage side rotary compressing element, to discharge said refrigerant gas into said closed vessel, an outlet for the intermediate pressure refrigerant gas from the closed vessel to be cooled; an inlet for the cooled, intermediate pressure refrigerant gas from outside said closed vessel to said high stage side rotary compressing element to be compressed to high pressure; an outlet for the high pressure refrigerant gas to be discharged outside said closed vessel, and a lower supporting member that is attached to a lower side of said high stage side rotary compressing element away from said partition plate, said lower supporting member having: a suction port, a bearing portion for supporting a lower end portion of the rotating shaft, which is located for rotation by said motor-drive element at the center of the lower supporting member, a muffling chamber surrounding an outer circumference of the bearing portion and having a surface opening, a cover plate for closing the surface opening of said muffling chamber, and an oil supply hole for providing fluid communication between an oil reservoir on a bottom portion of said closed vessel and the suction port.