The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 21, 2008
Filed:
Sep. 27, 2007
Kazuya Sato, Gunma, JP;
Kazuya Sato, Gunma, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
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.