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US 6,413,061 B1Granted
Rotary compressor and method of manufacturing the same
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMototaka Esumi, Kiyoharu Kyutoku
Life of this patent
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Abstract
A rotary compressor comprises a cylinder having an inner space and a groove, a roller sliding along the inside of the inner space of the cylinder, a vane penetrating through the groove, and refrigerant. The groove penetrates through the outside and inner space of the cylinder. The vane slides on the roller, and the vane also slides in and out of the groove. The vane includes stainless steel formed by sintering of powder material, a nitrogen diffusion layer disposed on the surface of the stainless steel, and a compound layer of iron and nitrogen disposed on the surface of the nitrogen diffusion layer. The stainless steel has a plurality of fine pores formed by sintering of powder material. The plurality of fine pores have a porosity of 15% or less.
Claims55
A rotary compressor comprising:
- (a) a cylinder having an inner space and a groove,
- said groove penetrating through an outside and an inner space of said cylinder,
- (b) a roller sliding along the inner surface of the inner space of said cylinder,
- (c) a vane inserted in said groove,
- said vane sliding in and out in said groove while sliding on said roller, and
- (d) a refrigerant,
- wherein said vane includes sintered stainless steel, a nitrogen diffusion layer disposed on the sintered stainless steel, and a compound layer of iron and nitrogen disposed on the nitrogen diffusion layer, and
- the sintered stainless steel has a plurality of fine pores formed by sintering of the powder material, and the plurality of fine pores have a porosity in a range of more than 0% to 15% or less.
5 more elements
A rotary compressor comprising:
- (a) a cylinder having an inner space and a groove,
- said groove penetrating through an outside and an inner space of said cylinder,
- (b) a roller sliding along the inner surface of the inner space of said cylinder,
- (c) a vane inserted in said groove,
- said vane sliding in and out in said groove while sliding on said roller, and
- (d) a refrigerant,
- wherein said vane includes stainless steel of martensitic structure, a nitrogen diffusion layer disposed on the surface of the stainless steel, and a compound layer of iron and nitrogen disposed on the surface of the nitrogen diffusion layer,
- said stainless steel has one chemical composition of either
- (i) a chemical composition of iron, 9 to 27% of chromium, and 0.4% or more of carbon, or
- (ii) a chemical composition of iron, 9 to 27% of chromium, 4 to 8% of nickel, and 0.2% or less of carbon, and
- said stainless steel has a plurality of fine pores formed by sintering of powder material having a hardening property, and the plurality of fine pores have a porosity in a range of more than 0% to 15% or less.
8 more elements
A rotary compressor comprising:
- (a) a cylinder having an inner space and a groove,
- said groove penetrating through the outside and inner space of said cylinder,
- (b) a roller sliding along the inner surface of the inner space of said cylinder,
- (c) a vane inserted in said groove,
- said vane sliding in and out in said groove while sliding on said roller, and
- (d) a refrigerant,
- wherein said vane includes stainless steel having a martensitic structure, a nitrogen diffusion layer disposed on the surface of the stainless steel, and a compound layer of iron and nitrogen disposed on the surface of the nitrogen diffusion layer,
- said stainless steel has a chemical composition of iron, 9 to 27% of chromium, and 0.4% or more of carbon, and
- said stainless steel has a plurality of fine pores formed by sintering of the powder material having quenching hardenability, and the plurality of fine pores have a porosity in a range of more than 0% to 15% or less.
6 more elements
A rotary compressor comprising:
- (a) a cylinder having an inner space and a groove,
- said groove penetrating through the outside and inner space of said cylinder,
- (b) a roller sliding along the inner surface of the inner space of said cylinder,
- (c) a vane inserted in said groove,
- said vane sliding in and out in said groove while sliding on said roller, and
- (d) a refrigerant,
- wherein said vane includes stainless steel having a martensitic structure, a nitrogen diffusion layer disposed on the surface of the stainless steel, and a compound layer of iron and nitrogen disposed on the surface of the nitrogen diffusion layer,
- the stainless steel has a chemical composition of iron, 9 to 27% of chromium, 4 to 8% of nickel;
- and 0.2% or less of carbon, and
- the stainless steel has a plurality of fine pores formed by sintering of the powder material having precipitation hardenability, and the plurality of fine pores have a porosity in a range of more than 0% to 15% or less.
7 more elements
A rotary compressor comprising:
- (a) a cylinder having an inner space and a groove,
- said groove penetrating through an outside and an inner space of said cylinder,
- (b) a roller sliding along the inner surface of the inner space of said cylinder,
- (c) a vane inserted in said groove,
- said vane sliding in and out in said groove while sliding on said roller, and
- (d) a refrigerant,
- wherein said vane includes stainless steel of martensitic structure, a nitrogen diffusion layer disposed on the surface of the stainless steel, and a compound layer of iron and nitrogen disposed on the surface of the nitrogen diffusion layer,
- said stainless steel has one chemical composition of either
- (i) a chemical composition of iron, 9 to 27% of chromium, and 0.4% or more of carbon, or
- (ii) a chemical composition of iron, 9 to 27% of chromium, 4 to 8% of nickel, and 0.2% or less of carbon, and
- said stainless steel has a plurality of fine pores formed by sintering of powder material having a hardening property, and the plurality of fine pores have a porosity in a range of more than 0% to 15% or less, and
- wherein said vane has a vane side surface sliding in the groove,
- said vane side surface has a surface of the nitrogen diffuse layer exposed by grinding process, and
- said nitrogen diffusion layer of the vane side surface slides on the inner surface of the groove.
11 more elements
A rotary compressor comprising:
- (a) a cylinder having an inner space and a groove,
- said groove penetrating through an outside and an inner space of said cylinder,
- (b) a roller sliding along the inner surface of the inner space of said cylinder,
- (c) a vane inserted in said groove,
- said vane sliding in and out in said groove while sliding on said roller, and
- (d) a refrigerant,
- wherein said vane includes stainless steel of martensitic structure, a nitrogen diffusion layer disposed on the surface of the stainless steel, and a compound layer of iron and nitrogen disposed on the surface of the nitrogen diffusion layer,
- said stainless steel has one chemical composition of either
- (i) a chemical composition of iron, 9 to 27% of chromium, and 0.4% or more of carbon, or
- (ii) a chemical composition of iron, 9 to 27% of chromium, 4 to 8% of nickel, and 0.2% or less of carbon, and
- said stainless steel has a plurality of fine pores formed by sintering of powder material having a hardening property, and the plurality of fine pores have a porosity in a range of more than 0% to 15% or less, and
- wherein said vane has a vane side surface sliding in the groove,
- said vane side surface has both surfaces of the nitrogen diffusion layer and compound layer exposed by grinding process, and
- both the nitrogen diffusion layer and compound layer of the vane side surface slide on the inner surface of the groove.
11 more elements
A rotary compressor comprising:
- (a) a cylinder having an inner space and a groove,
- said groove penetrating through an outside and an inner space of said cylinder,
- (b) a roller sliding along the inner surface of the inner space of said cylinder,
- (c) a vane inserted in said groove,
- said vane sliding in and out in said groove while sliding on said roller, and
- (d) a refrigerant,
- wherein said vane includes stainless steel of martensitic structure, a nitrogen diffusion layer disposed on the surface of the stainless steel, and a compound layer of iron and nitrogen disposed on the surface of the nitrogen diffusion layer,
- said stainless steel has one chemical composition of either
- (i) a chemical composition of iron, 9 to 27% of chromium, and 0.4% or more of carbon, or
- (ii) a chemical composition of iron, 9 to 27% of chromium, 4 to 8% of nickel, and 0.2% or less of carbon, and
- said stainless steel has a plurality of fine pores formed by sintering of powder material having a hardening property, and the plurality of fine pores have a porosity in a range of more than 0% to 15% or less, and
- wherein said vane has a vane side surface sliding in the groove,
- said vane side surface has a surface of the compound layer exposed by grinding process,
- at least one pore of the plurality of fine pores is exposed on the surface of the compound layer, and
- the compound layer of the vane side surface slides on the inner surface of the groove.
12 more elements
A rotary compressor comprising:
- (a) a cylinder having an inner space and a groove,
- said groove penetrating through an outside and an inner space of said cylinder,
- (b) a roller sliding along the inner surface of the inner space of said cylinder,
- (c) a vane inserted in said groove,
- said vane sliding in and out in said groove while sliding on said roller, and
- (d) a refrigerant,
- wherein said vane includes stainless steel of martensitic structure, a nitrogen diffusion layer disposed on the surface of the stainless steel, and a compound layer of iron and nitrogen disposed on the surface of the nitrogen diffusion layer,
- said stainless steel has one chemical composition of either
- (i) a chemical composition of iron, 9 to 27% of chromium, and 0.4% or more of carbon, or
- (ii) a chemical composition of iron, 9 to 27% of chromium, 4 to 8% of nickel, and 0.2% or less of carbon, and
- said stainless steel has a plurality of fine pores formed by sintering of powder material having a hardening property, and the plurality of fine pores have a porosity in a range of more than 0% to 15% or less,
- wherein said pore of the vane has an oxide film formed by steam treatment, and
- said nitrogen diffusion layer is disposed on said oxide film.
10 more elements
A rotary compressor comprising
- (a) a cylinder having an inner space and a groove,
- said groove penetrating through an outside and an inner space of said cylinder,
- (b) a roller sliding along the inner surface of the inner space of said cylinder,
- (c) a vane inserted in said groove,
- said vane sliding in and out in said groove while sliding on said roller, and
- (d) a refrigerant,
- wherein said vane includes stainless steel of martensitic structure, a nitrogen diffusion layer disposed on the surface of the stainless steel, and a compound layer of iron and nitrogen disposed on the surface of the nitrogen diffusion layer,
- said stainless steel has one chemical composition of either
- (i) a chemical composition of iron, 9 to 27% of chromium, and 0.4% or more of carbon, or
- (ii) a chemical composition of iron, 9 to 27% of chromium, 4 to 8% of nickel, and 0.2% or less of carbon, and
- said stainless steel has a plurality of fine pores formed by sintering of powder material having a hardening property, and the plurality of fine pores have a porosity in a range of more than 0% to 15% or less,
- wherein said roller is made of cast alloy containing iron, 0.5 to 1.0% of chromium, 0.2 to 0.4% of molybdenum, and 0.1 to 0.4% of phosphorus.
9 more elements
A rotary compressor comprising:
- (a) a cylinder having an inner space and a groove,
- said groove penetrating through an outside and an inner space of said cylinder,
- (b) a roller sliding along the inner surface of the inner space of said cylinder,
- (c) a vane inserted in said groove,
- said vane sliding in and out in said groove while sliding on said roller, and
- (d) a refrigerant,
- wherein said vane includes stainless steel of martensitic structure, a nitrogen diffusion layer disposed on the surface of the stainless steel, and a compound layer of iron and nitrogen disposed on the surface of the nitrogen diffusion layer,
- said stainless steel has one chemical composition of either
- (i) a chemical composition of iron, 9 to 27% of chromium, and 0.4% or more of carbon, or
- (ii) a chemical composition of iron, 9 to 27% of chromium, 4 to 8% of nickel, and 0.2% or less of carbon, and
- said stainless steel has a plurality of fine pores formed by sintering of powder material having a hardening property, and the plurality of fine pores have a porosity in a range of more than 0% to 15% or less,
- wherein said roller is made of cast alloy containing iron, 0.5 to 1.0% of chromium, 0.2 to 0.4% of molybdenum, and 0.02 to 0.1% of boron.
9 more elements
A rotary compressor comprising:
- (a) a cylinder having an inner space and a groove,
- said groove penetrating through an outside and an inner space of said cylinder,
- (b) a roller sliding along the inner surface of the inner space of said cylinder,
- (c) a vane inserted in said groove,
- said vane sliding in and out in said groove while sliding on said roller, and
- (d) a refrigerant,
- wherein said vane includes sintered stainless steel, a nitrogen diffusion layer disposed on the surface of the stainless steel, and a compound layer of iron and nitrogen disposed on the surface of the nitrogen diffusion layer,
- said stainless steel has a plurality of fine pores formed by sintering of powder material, and the plurality of fine pores have a porosity in a range of more than 0% to 15% or less,
- said vane has a vane side surface sliding in the groove,
- said vane side surface has a surface of the nitrogen diffuse layer exposed by grinding process, and
- said nitrogen diffusion layer of the vane side surface slides on the inner surface of the groove.
8 more elements
A rotary compressor comprising:
- (a) a cylinder having an inner space and a groove,
- said groove penetrating through an outside and an inner space of said cylinder,
- (b) a roller sliding along the inner surface of the inner space of said cylinder,
- (c) a vane inserted in said groove,
- said vane sliding in and out in said groove while sliding on said roller, and
- (d) a refrigerant,
- wherein said vane includes sintered stainless steel, a nitrogen diffusion layer disposed on the surface of the stainless steel, and a compound layer of iron and nitrogen disposed on the surface of the nitrogen diffusion layer,
- said stainless steel has a plurality of fine pores formed by sintering of powder material, and the plurality of fine pores have a porosity in a range of more than 0% to 15% or less,
- said vane has a vane side surface sliding in the groove,
- said vane side surface has both surface of the nitrogen diffuse layer and compound layer exposed by grinding process, and
- both said nitrogen diffusion layer and compound layer of the vane side surface slides on the inner surface of the groove.
8 more elements
A manufacturing method of rotary compressor comprising the steps of:
- (a) preparing a cylinder,
- (b) preparing a roller,
- (c) preparing a vane,
- (d) presenting a refrigerant, and
- (e) assembling the cylinder, roller, vane, and refrigerant,
- wherein said step of preparing the vane includes the steps of:
- (i) molding a stainless steel powder material into a specified shape, and forming a molded piece,
- (ii) baking said molded piece and forming a base molded piece having fine pores,
- said fine pores having a porosity in a range of more than 0% to 15% or less,
- (iii) heating said base molded piece, and forming a base molded piece having martensitic structure, and
- (iv) nitriding said base molded piece having the martensitic structure and fine pores, and placing a nitrogen diffusion layer and an iron-nitrogen compound layer on the surface of the base molded piece,
- said nitrogen diffusion layer being formed on said base molded piece, and said compound layer being formed on said nitrogen diffusion layer.
9 more elements
A manufacturing method of rotary compressor comprising the steps of:
- (a) preparing a cylinder,
- (b) preparing a roller,
- (c) preparing a vane,
- (d) presenting a refrigerant, and
- (e) assembling the cylinder, roller, vane, and refrigerant,
- wherein said step of preparing the vane includes the steps of:
- (i) molding a stainless steel powder material into a specified shape, and forming a molded piece,
- (ii) baking said molded piece and forming a base molded piece having fine pores,
- said fine pores having a porosity in a range of more than 0% to 15% or less,
- (iii) heating said base molded piece, and forming a base molded piece having martensitic structure, and
- (iv) nitriding said base molded piece having the martensitic structure and fine pores, and placing a nitrogen diffusion layer and an iron-nitrogen compound layer on the surface of the base molded piece,
- said nitrogen diffusion layer being formed on said base molded piece, and said compound layer being formed on said nitrogen diffusion layer,
- wherein said step of preparing the vane further includes a step of:
- (v) cutting the side of the vane, removing the compound layer disposed on the side of the vane, and exposing the nitrogen diffusion layer, and
- the nitrogen diffusion layer at the side of the vane slides on the groove formed in the cylinder.
12 more elements
A manufacturing method of rotary compressor comprising the steps of:
- (a) preparing a cylinder,
- (b) preparing a roller,
- (c) preparing a vane,
- (d) presenting a refrigerant, and
- (e) assembling the cylinder, roller, vane, and refrigerant,
- wherein said step of preparing the vane includes the steps of:
- (i) molding a stainless steel powder material into a specified shape, and forming a molded piece,
- (ii) baking said molded, piece and forming a base molded piece having fine pores,
- said fine pores having a porosity in a range of more than 0% to 15% or less,
- (iii) heating said base molded piece, and forming a base molded piece having martensitic structure, and
- (iv) nitriding said base molded piece having the martensitic structure and fine pores, and placing a nitrogen diffusion layer and an iron-nitrogen compound layer on the surface of the base molded piece,
- said nitrogen diffusion layer being formed on said base molded piece, and said compound layer being formed on said nitrogen diffusion layer,
- wherein said step of preparing the vane further includes a step of:
- (v) cutting the side of the vane, and exposing both a part of the compound layer and a part of the nitrogen diffusion layer disposed at the side of the vane, and
- a surface having both the part of the compound layer and the part of the nitrogen diffusion layer at the side of the vane slides on the groove formed in the cylinder.
12 more elements
A manufacturing method of rotary compressor comprising the steps of:
- (a) preparing a cylinder,
- (b) preparing a roller,
- (c) preparing a vane,
- (d) presenting a refrigerant, and
- (e) assembling the cylinder, roller, vane, and refrigerant;
- wherein said step of preparing the vane includes the steps of:
- (i) molding a stainless steel powder material into a specified shape, and forming a molded piece,
- (ii) baking said molded piece and forming a base molded piece having fine pores,
- said fine pores having a porosity in a range of more than 0% to 15% or less,
- (iii) heating said base molded piece, and forming a base molded piece having martensitic structure,
- (iv) treating the surface of the base molded piece having fine pores with steam, and forming an oxide film in the fine pores,
- (v) nitriding said base molded piece having the martensitic structure and fine pores, and placing a nitrogen diffusion layer and an iron-nitrogen compound layer on the surface of the base molded piece,
- said nitrogen diffusion layer being formed on said base molded piece and said oxide film, and said compound layer being formed on said nitrogen diffusion layer.
10 more elements
Dependencies are inferred from the claim text.