# US 2014/0154116 A1 · Scroll compressor

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- Number: US 2014/0154116 A1
- Document ID: US20140154116A1
- Status: Published application
- Kind: A1
- Application number: 14/171,834
- Filed: 2014-02-04
- Published: 2014-06-05
- Earliest claimed: 2008-06-16
- Assignees: Mitsubishi Electric Corporation
- Applicants: Mitsubishi Electric Corporation
- Inventors: Fumihiko ISHIZONO; Hideaki MAEYAMA; Takeshi FUSHIKI; Taro KATO
- Web page: https://patentgrep.com/patent/US20140154116A1

## CPC

- F04C 23/02: Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04C 18/0207: {both members having co-operating elements in spiral form}
- C09K 5/042: {comprising compounds containing carbon and hydrogen only}
- C09K 5/045: {containing only fluorine as halogen}
- C09K 2205/126: Unsaturated fluorinated hydrocarbons
- F04C 2210/26: Refrigerants with particular properties, e.g. HFC-134a
- F04C 2230/91: Coating
- F04C 2230/92: Surface treatment
- F05C 2203/08: Ceramics; Oxides
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- F05C: INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES

## Abstract

A scroll compressor has an electric motor portion, a compression mechanism portion connected to the electric motor portion, and an oil sump for lubricating oil in a sealed container and compresses a refrigerant in the compression mechanism portion. A used refrigerant is a halogenated hydrocarbon or a hydrocarbon having a carbon double bond in the composition or is a mixture containing one of the same. A sliding surface of at least one of two components constituting a sliding portion having a relation of sliding to each other in a sealed container is structured in such a way that an iron metal or an aluminum metal is not directly exposed.

## Claims

### Claim 1

A scroll compressor, in which there are provided an electric motor portion, a compression mechanism portion connected to the electric motor portion, and an oil sump for lubricating oil in a sealed container, and in which the compression mechanism portion compresses a refrigerant, wherein
the refrigerant includes at least “HFO-1234yf”, and
a sliding surface of at least one of two components constituting a sliding portion having a relation of sliding to each other in the sealed container is structured in such a way as to be subjected to coating treatment or coating film formation treatment with material that does not include iron and aluminum, and that suppress decomposition or polymerization of the refrigerant, so that an iron metal or an aluminum metal is not directly exposed to the refrigerant.

### Claim 2 (depends on 1)

The scroll compressor of claim 1, wherein the compression mechanism portion includes:
a fixed scroll and a swing scroll that form a compression chamber by combining spiral portions in which the spiral directions are reverse to each other,
a swing bearing provided at the side of an anti-compression chamber of the swing scroll,
a frame that supports a thrust bearing surface of the swing scroll through a thrust plate,
an Oldham ring including upper and lower convex portions serving as keys which are accommodated in the swing scroll and the frame to prevent rotation of the swing scroll,
a main axis that transmits a driving force to the swing scroll, penetrates a main bearing provided at the central portion of the frame, and is connected to an oil pump for supplying the lubricating oil in the oil sump to the sliding portion,
a slider rotatably stored in the swing bearing and into which the main axis is inserted, and
a sleeve rotatably stored in the main bearing, and wherein
a slider surface inside the slider is subjected to the coating treatment or the coating film treatment.

### Claim 3 (depends on 2)

The scroll compressor of claim 2, wherein
a slider plate is provided between the main axis and the slider, and
the slider plate is subjected to the coating treatment or the coating film treatment.

### Claim 4 (depends on 1)

The scroll compressor of claim 1, wherein the compression mechanism portion includes:
a fixed scroll and a swing scroll that form a compression chamber by combining spiral portions in which the spiral directions are reverse to each other,
an Oldham ring including upper and lower convex portions serving as keys which are accommodated in the fixed scroll and the swing scroll to prevent rotation of the swing scroll,
a swing bearing provided at the side of an anti-compression chamber of the swing scroll,
a thrust bearing member provided at a thrust surface of the swing scroll,
a frame that supports the thrust bearing member through a thrust plate,
a main axis that transmits a driving force to the swing scroll, penetrates a main bearing provided at the central portion of the frame, and is connected to an oil pump for supplying the lubricating oil in the oil sump to the sliding portion,
a slider rotatably stored in the swing bearing and into which the main axis is inserted,
a slider plate provided between the main axis and the slider, and
a sleeve rotatably stored in the main bearing, and wherein
a slider surface inside the slider or the slider plate is subjected to the coating treatment or the coating film treatment.

### Claim 5 (depends on 1)

The scroll compressor of claim 1, wherein the compression mechanism portion includes:
a fixed scroll and a swing scroll that form a compression chamber by combining spiral portions in which the spiral directions are reverse to each other,
a swing bearing provided at the side of an anti-compression chamber of the swing scroll,
a thrust plate provided at a thrust surface of the swing scroll,
a frame provided with a thrust bearing member at a portion supporting the thrust plate,
an Oldham ring including upper and lower convex portions serving as keys which are accommodated in the swing scroll and the frame to prevent rotation of the swing scroll,
a main axis that transmits a driving force to the swing scroll, penetrates a main bearing provided at the central portion of the frame, and is connected to an oil pump for supplying the lubricating oil in the oil sump to each sliding portion,
a slider rotatably stored in the swing bearing and into which the main axis is inserted,
a slider plate provided between the main axis and the slider, and
a sleeve rotatably stored in the main bearing, and wherein
a slider surface inside the slider or the slider plate is subjected to the coating treatment or the coating film treatment.

### Claim 6 (depends on 1)

The scroll compressor of claim 1, wherein the compression mechanism portion includes:
a fixed scroll and a swing scroll that form a compression chamber by combining spiral portions in which the spiral directions are reverse to each other,
a swing axis pivot portion provided at the side of an anti-compression chamber of the swing scroll,
a thrust plate provided at a thrust surface of the swing scroll,
a first frame provided with a thrust bearing member at a portion supporting the thrust plate,
a second frame disposed at a lower portion of the first frame,
an Oldham ring including upper and lower convex portions serving as keys which are accommodated in the swing scroll and the first frame to prevent rotation of the swing scroll,
a main axis that transmits a driving force to the swing scroll, penetrates an upper main bearing provided at the central portion of the first frame and a lower main bearing provided at the central portion of the second frame, and is connected to an oil pump for supplying the lubricating oil in the oil sump to the sliding portion and whose self weight is supported by a secondary thrust bearing of the second frame,
a sleeve for accommodating the swing axis pivot portion, and
a swing bearing for rotatably accommodating the sleeve in the axis.

### Claim 7 (depends on 1)

The scroll compressor of claim 1, wherein the compression mechanism portion includes:
a fixed scroll and a swing scroll that form a compression chamber by combining spiral portions in which the spiral directions are reverse to each other,
an Oldham ring including upper and lower convex portions serving as keys which are accommodated in the fixed scroll and the swing scroll to prevent rotation of the swing scroll,
a swing bearing provided at the side of an anti-compression chamber of the swing scroll,
a compliant frame that supports a thrust surface of the swing scroll,
a guide frame that slidably accommodates the compliant frame, and
a main axis that transmits a driving force to the swing scroll, penetrates a main bearing and an auxiliary main bearing provided at the central portion of the compliant frame, and is connected to an oil pump for supplying the lubricating oil in the oil sump to the sliding portion, and whose self weight is supported by an axial thrust receiver of a sub-frame.

### Claim 8 (depends on 1)

The scroll compressor of claim 1, wherein the compression mechanism portion includes:
a pair of fixed scrolls in which spiral portions are disposed facing each other,
a swing scroll that is provided between the pair of fixed scrolls and has spiral portions to be engaged with spiral portions of the pair of fixed scrolls, respectively, at both sides of the axis direction to form a compression chamber in cooperation with the pair of fixed scrolls,
an Oldham ring including upper or lower convex portions serving as keys which are accommodated in one of the fixed scrolls and the remaining upper or lower convex portions serving as keys which are accommodated in the swing scroll to prevent rotation of the swing scroll,
a swing bearing that penetrates the central portion of the swing scroll,
an upper main bearing and a lower main bearing provided at the central portion of each of the fixed scrolls,
a main axis that penetrates the swing bearing, the upper main bearing, and the lower main bearing being connected to an oil pump for supplying the lubricating oil in the oil sump to the sliding portion, and whose self weight is supported by an axial thrust surface of one of the fixed scrolls,
a slider rotatably stored in the swing bearing and into which the main axis is inserted, and
a sleeve rotatably stored in the lower main bearing, and wherein
a slider surface inside the slider is subjected to the coating treatment or the coating film treatment.

### Claim 9

A scroll compressor, in which there are provided an electric motor portion, a compression mechanism portion connected to the electric motor portion, and an oil sump for lubricating oil in a sealed container, and in which the compression mechanism portion compresses a refrigerant, wherein
the refrigerant includes at least “HFO-1234yf”, and
a sliding surface of at least one of two components constituting a sliding portion having a relation of sliding to each other in the sealed container is structured in such a way that the sliding surface of at least one of two components that constitute the sliding portion is formed with a ceramic material or resin, so that an iron metal or an aluminum metal is not directly exposed to the refrigerant.

### Claim 10 (depends on 9)

The scroll compressor of claim 9, wherein the compression mechanism portion includes:
a fixed scroll and a swing scroll that form a compression chamber by combining spiral portions in which the spiral directions are reverse to each other,
a swing bearing provided at the side of an anti-compression chamber of the swing scroll,
a frame that supports a thrust bearing surface of the swing scroll through a thrust plate,
an Oldham ring including upper and lower convex portions serving as keys which are accommodated in the swing scroll and the frame to prevent rotation of the swing scroll,
a main axis that transmits a driving force to the swing scroll, penetrates a main bearing provided at the central portion of the frame, and is connected to an oil pump for supplying the lubricating oil in the oil sump to the sliding portion,
a slider rotatably stored in the swing bearing and into which the main axis is inserted, and
a sleeve rotatably stored in the main bearing, and wherein
a slider surface inside the slider is formed with the ceramic material or the resin.

### Claim 11 (depends on 10)

The scroll compressor of claim 10, wherein a slider plate is provided between the main axis and the slider, and
a slider surface of the slider plate is formed with the ceramic material or the resin.

### Claim 12 (depends on 9)

The scroll compressor of claim 9, wherein the compression mechanism portion includes:
a fixed scroll and a swing scroll that form a compression chamber by combining spiral portions in which the spiral directions are reverse to each other,
an Oldham ring including upper and lower convex portions serving as keys which are accommodated in the fixed scroll and the swing scroll to prevent rotation of the swing scroll,
a swing bearing provided at the side of an anti-compression chamber of the swing scroll,
a thrust bearing member provided at a thrust surface of the swing scroll,
a frame that supports the thrust bearing member through a thrust plate,
a main axis that transmits a driving force to the swing scroll, penetrates a main bearing provided at the central portion of the frame, and is connected to an oil pump for supplying the lubricating oil in the oil sump to the sliding portion,
a slider rotatably stored in the swing bearing and into which the main axis is inserted,
a slider plate provided between the main axis and the slider, and
a sleeve rotatably stored in the main bearing, and wherein
a slider surface inside the slider or a slider surface of the slider plate is formed with the ceramic material or the resin.

### Claim 13 (depends on 9)

The scroll compressor of claim 9, wherein the compression mechanism portion includes:
a fixed scroll and a swing scroll that form a compression chamber by combining spiral portions in which the spiral directions are reverse to each other,
a swing bearing provided at the side of an anti-compression chamber of the swing scroll,
a thrust plate provided at a thrust surface of the swing scroll,
a frame provided with a thrust bearing member at a portion supporting the thrust plate,
an Oldham ring including upper and lower convex portions serving as keys which are accommodated in the swing scroll and the frame to prevent rotation of the swing scroll,
a main axis that transmits a driving force to the swing scroll, penetrates a main bearing provided at the central portion of the frame, and is connected to an oil pump for supplying the lubricating oil in the oil sump to each sliding portion,
a slider rotatably stored in the swing bearing and into which the main axis is inserted,
a slider plate provided between the main axis and the slider, and
a sleeve rotatably stored in the main bearing, and wherein
a slider surface inside the slider or a slider surface of the slider plate is formed with the ceramic material or the resin.

### Claim 14 (depends on 9)

The scroll compressor of claim 9, wherein the compression mechanism portion includes:
a fixed scroll and a swing scroll that form a compression chamber by combining spiral portions in which the spiral directions are reverse to each other,
a swing axis pivot portion provided at the side of an anti-compression chamber of the swing scroll,
a thrust plate provided at a thrust surface of the swing scroll,
a first frame provided with a thrust bearing member at a portion supporting the thrust plate,
a second frame disposed at a lower portion of the first frame,
an Oldham ring including upper and lower convex portions serving as keys which are accommodated in the swing scroll and the first frame to prevent rotation of the swing scroll,
a main axis that transmits a driving force to the swing scroll, penetrates an upper main bearing provided at the central portion of the first frame and a lower main bearing provided at the central portion of the second frame, and is connected to an oil pump for supplying the lubricating oil in the oil sump to the sliding portion and whose self weight is supported by a secondary thrust bearing of the second frame,
a sleeve for accommodating the swing axis pivot portion, and
a swing bearing for rotatably accommodating the sleeve in the axis.

### Claim 15 (depends on 9)

The scroll compressor of claim 9, wherein the compression mechanism portion includes:
a fixed scroll and a swing scroll that form a compression chamber by combining spiral portions in which the spiral directions are reverse to each other,
an Oldham ring including upper and lower convex portions serving as keys which are accommodated in the fixed scroll and the swing scroll to prevent rotation of the swing scroll,
a swing bearing provided at the side of an anti-compression chamber of the swing scroll,
a compliant frame that supports a thrust surface of the swing scroll, a guide frame that slidably accommodates the compliant frame, and
a main axis that transmits a driving force to the swing scroll, penetrates a main bearing and an auxiliary main bearing provided at the central portion of the compliant frame, and is connected to an oil pump for supplying the lubricating oil in the oil sump to the sliding portion, and whose self weight is supported by an axial thrust receiver of a sub-frame.

### Claim 16 (depends on 9)

The scroll compressor of claim 9, wherein the compression mechanism portion includes:
a pair of fixed scrolls in which spiral portions are disposed facing each other,
a swing scroll that is provided between the pair of fixed scrolls and has spiral portions to be engaged with spiral portions of the pair of fixed scrolls, respectively, at both sides of the axis direction to form a compression chamber in cooperation with the pair of fixed scrolls,
an Oldham ring including upper or lower convex portions serving as keys which are accommodated in one of the fixed scrolls and the remaining upper or lower convex portions serving as keys which are accommodated in the swing scroll to prevent rotation of the swing scroll,
a swing bearing that penetrates the central portion of the swing scroll,
an upper main bearing and a lower main bearing provided at the central portion of each of the fixed scrolls,
a main axis that penetrates the swing bearing, the upper main bearing, and the lower main bearing being connected to an oil pump for supplying the lubricating oil in the oil sump to the sliding portion, and whose self weight is supported by an axial thrust surface of one of the fixed scrolls,
a slider rotatably stored in the swing bearing and into which the main axis is inserted, and
a sleeve rotatably stored in the lower main bearing, and wherein
a slider surface inside the slider is formed with the ceramic material or the resin.