In a two-stage rotary compressor of the present invention, an oil supply hole connecting an oil reservoir on a bottom portion in a closed vessel to a suction port formed in a lower supporting member is provided in the lower supporting member attached to the lower side of a high stage side rotary com
In a two-stage rotary compressor of the present invention, an oil supply hole connecting an oil reservoir on a bottom portion in a closed vessel to a suction port formed in a lower supporting member 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. Additionally, the gas seal properties between an inner circumferential surface of the cylinder and an outer circumferential surface of the roller and between a roller end surface and a partition plate and between a roller end surface and a cylinder end surface, are increased whereby the compression efficiency of the refrigerant gas can be improved. Further, the lower supporting member is provided with a bearing portion as well as a muffling chamber, and also a cover plate, which closes an opening surface of the muffling chamber. Further a concave groove is provided on a lower end surface of the bearing portion in the circumferential direction and an O ring is attached to the groove and gas-sealing is made by interposing a gasket in a connection portion between the lower supporting member and the cover plate. Accordingly, concave grooving work for O ring attachment in the outer circumference of the bearing portion and cutting work in the upper supporting member, which have been conventionally performed, can be eliminated.
대표청구항▼
What is claimed is: 1. A two-stage rotary compressor in which a motor-drive element and a rotary compressing element driven by said motor-drive element are provided on the upper and lower portions respectively in a closed vessel, said two-stage rotary compressor comprising: a low stage side rotary
What is claimed is: 1. A two-stage rotary compressor in which a motor-drive element and a rotary compressing element driven by said motor-drive element are provided on the upper and lower portions respectively in a closed vessel, said two-stage rotary compressor comprising: a low stage side rotary compressing element and a high stage side rotary compressing element that are positioned on upper and lower sides of the rotary compressing element, respectively, whereby an intermediate pressure refrigerant gas compressed by said low stage side rotary compressing element is discharged into said closed vessel, the intermediate pressure refrigerant gas discharged into the closed vessel is taken outside the closed vessel to be cooled and then the cooled intermediate pressure refrigerant gas is supplied to said high stage side rotary compressing element to be compressed to high pressure and the high pressure refrigerant gas is discharged outside said closed vessel; a lower supporting member that is attached to a lower side of said high stage side rotary compressing element, said lower supporting member including: a bearing portion at the center of the lower supporting member for supporting a lower end portion of a rotating shaft, which is rotated by said motor-drive element, wherein a step is provided between the lower end surface of the bearing portion and a lower end surface of said lower supporting member, a muffling chamber surrounding an outer circumference of the bearing portion, and a cover plate that is attached to the lower side of said lower supporting member for closing an opening surface of said muffling chamber; and a gas seal including: a concave groove disposed on a lower end surface of said bearing portion in its circumferential direction, an O ring disposed in said concave groove, and a gasket that is interposed in a connection .portion between said lower supporting member and said cover plate, wherein the gasket has a same thickness or a slightly smaller thickness than the step. 2. A two-stage rotary compressor in which a motor-drive element and a rotary compressing element driven by said motor-drive element are provided on the upper and lower portions respectively in a closed vessel, said two-stage rotary compressor comprising: a low stage side rotary compressing element and a high stage side rotary compressing element that are positioned on lower and upper sides of the rotary compressing element, respectively, whereby, an intermediate pressure refrigerant gas compressed by said low stage side rotary compressing element is discharged to the outside of said closed vessel to be cooled, then the cooled refrigerant gas is supplied to said high stage side rotary compressing element to be compressed to high pressure, the high pressure refrigerant gas is discharged into said closed vessel and then the high pressure refrigerant gas discharged into the closed vessel is taken outside the closed vessel, wherein a lower supporting member is attached to the lower side of said low stage side rotary compressing element, said lower supporting member including: a bearing portion disposed at the center of the lower supporting member for supporting a lower end portion of a rotating shaft, which is rotated by said motor-drive element; wherein a step is provided between the lower end surface of the bearing portion and a lower end surface of said lower supporting member, a muffling chamber surrounding an outer circumference of the bearing portion, a cover plate that is attached to a lower side of said lower supporting member for closing an opening surface of said muffling chamber, and a gas seal including: a concave groove that is provided on a lower end surface of said bearing portion in its circumferential direction, an O ring disposed in said concave groove, and a gasket that is interposed in a connection portion between said lower supporting member and said cover plate, wherein the gasket has a same thickness or a slightly smaller thickness than the step.
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