An oil supply hole connecting an oil reservoir to a suction port formed in a lower supporting member of a two-stage rotary compressor is disclosed. The suction port is provided in the lower supporting member attached to the lower side of a high stage side rotary compressing element, and a necessary
An oil supply hole connecting an oil reservoir to a suction port formed in a lower supporting member of a two-stage rotary compressor is disclosed. The suction port is provided in the lower supporting member attached to the lower side of a high stage side rotary compressing element, and a necessary amount of oil is supplied into return refrigerant gas sucked into the high stage side rotary compressing element through this oil supply hole. Thus an outer circumferential surface of a roller, which eccentrically rotates in a cylinder, is lubricated to protect it from wear.
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What is claimed is: 1. 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 d
What is claimed is: 1. 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. 2. The two-stage rotary compressor according to claim 1, wherein in said oil supply hole the upper end thereof is opened to the suction port of said lower supporting member and the lower end thereof is opened to a gap formed by a gasket interposed between said lower supporting member and said cover plate. 3. The two-stage rotary compressor according to claim 1, wherein in said oil supply hole the upper end thereof is opened to the suction port of said lower supporting member and the lower end thereof is opened to a concave groove formed in a lower end surface of said lower supporting member. 4. The two-stage rotary compressor according to claim 1, wherein in said oil supply hole the upper end thereof is opened to the suction port of said lower supporting member and the lower end thereof is opened to a cutout portion formed in a lower end surface of said lower supporting member. 5. A method of compressing an intermediate pressure refrigerant gas using 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; the method comprising: compressing the intermediate pressure refrigerant gas in the low stage side rotary compressing element; discharging said refrigerant gas into said closed vessel; removing said refrigerant gas from the closed vessel; cooling said refrigerant gas outside of the closed vessel; supplying said intermediate pressure refrigerant gas as cooled outside the closed vessel to said high stage side rotary compressing element through the suction port; compressing said intermediate pressure refrigerant gas to high pressure in said high stage side rotary compressing element; discharging the high pressure refrigerant gas outside said closed vessel; and lubricating the cylinder of the high stage side rotary compressing element using a differential pressure that is created between the intermediate pressure refrigerant gas as it enters the suction port of said high stage side rotary compressing element and an oil reservoir via said oil supply hole. 6. A method of lubricating a cylinder of a high stage side rotary compressing element of a two-stage rotary compressor, the two-stage rotary compressor having a rotary compressing element that includes: 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, and a lower supporting member that is attached to the lower side of said high stage side rotary compressing element, said lower supporting member being provided with: a suction port, and an oil supply hole, the method comprising: providing a fluid path between an oil reservoir and the suction port via the oil supply hole; supplying an intermediate pressure refrigerant gas to said high stage side rotary compressing element through the suction port disposed in the lower supporting member to create a pressure differential; drawing oil from said oil reservoir to lubricate said cylinder of said high stage side rotary compressing element using the pressure differential created between said suction port and said oil reservoir via said oil supply hole.
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