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AssigneesHitachi, Ltd., Toyo Tanso Co., Ltd.
InventorsHiroshi Takayasu, Noboru Baba, Shouichi Nakashima, Tadashi Iizuka, Toshiaki Yamanaka, Hiroaki Ogura, Toshiomi Fukuda, Shinichi Ozaki
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The object of the present invention is to provide: high-reliability and long-life CO2 refrigerant compressor-use bearings that uses bearing materials high in wear resistance and in baking resistance, and; such a compressor, air conditioner, refrigerator, and hot-water supply machine that each employ these bearings. The CO2 refrigerant compressor-use bearings according to the present invention, and the compressor, air conditioner, refrigerator, and hot-water supply machine that employ these bearings, wherein the bearings are characterized in that each bearing comprises a cylindrically shaped member whose graphite-containing carbonaceous base material has pores impregnated with tin or with one type of metal selected from the IB group or the VIII group, except iron, or with an alloy based on these metals, and in that each bearing satisfies at least one of the requirements that the bearing should comprise a carbonaceous base material containing 20 to 50 weight percent graphite, that the Shore hardness of the corresponding member should range from 65 to 120, that the compressive strength of the corresponding member should range from 200 to 500 MPa, that the porosity rate of the corresponding member should range from 0.05 to 2.00 volume percent, and that the metal or alloy contained in the corresponding member should contain at least either vanadium or titanium or both at the rate of 0.2 weight percent or less.
A CO2 refrigerant compressor for compressing a CO2 refrigerant, comprising a compression device driven by a bearing-supported rotary shaft, wherein said compression device includes an intermediate-pressure compression device which applies an intermediate pressure created by a roller eccentrically rotated inside a cylinder by the rotation of said rotary shaft, and a high-pressure compression means which creates a high pressure from the intermediate pressure given by the roller eccentrically rotated inside the cylinder by the rotation of the rotary shaft, and wherein a bearing supporting the rotary shaft comprises a cylindrically-shaped member whose graphite-containing carbonaceous base material has pores impregnated with tin or with one type of metal selected from the IB group or the VIII group, except iron, or with an alloy based on these metals.
A CO2 refrigerant compressor comprising a compression device driven by a bearing-supported rotary shaft, wherein said compression device includes a fixed scroll and a rotary scroll driven by said rotary shaft facing said fixed scroll, and wherein a bearing supporting the rotary shaft comprises a cylindrically-shaped member whose graphite-containing carbonaceous base material has pores impregnated with tin or with one type of metal selected from the IB group or the VIII group, except iron, or with an alloy based on these metals.
Dependencies are inferred from the claim text.