# US 12,000,395 B2 · Scroll compressor and refrigeration cycle device

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- Number: US 12,000,395 B2
- Document ID: US12000395B2
- Status: Granted
- Kind: B2
- Application number: 17/901,944
- Filed: 2022-09-02
- Published: 2023-03-09
- Granted: 2024-06-04
- Earliest claimed: 2021-09-03
- Assignees: Hitachi-Johnson Controls Air Conditioning, Inc.
- Applicants: Hitachi-Johnson Controls Air Conditioning, Inc.
- Inventors: Kazuyuki Matsunaga; Ryota Iijima
- Web page: https://patentgrep.com/patent/US12000395B2

## CPC

- F04C 18/0261: {Details of the ports, e.g. location, number, geometry}
- F04C 18/0215: {where only one member is moving}
- F04C 18/0253: {Details concerning the base}
- F04C 23/008: {Hermetic pumps}
- F04C 27/005: {Axial sealings for working fluid}
- F04C 29/023: {Lubricant distribution through a hollow driving shaft (F04C29/025 takes precedence)}
- F04C 2240/603: with internal channels for fluid distribution, e.g. hollow shaft
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS

## Abstract

In a scroll compressor, at an end plate surface of a fixed scroll, an annular back pressure groove connected to a back pressure chamber is provided, and an arc-shaped first groove and an arc-shaped second groove are provided inside the back pressure groove in a radial direction. A distance between the second groove and the back pressure groove is shorter than a distance between the first groove and the back pressure groove. A revolving scroll is provided with a first hole and a second hole for guiding lubricant oil from an oil supply path to the end plate surface side of the fixed scroll. At least part of a movement locus of an opening of the first hole is included in the first groove. At least part of a movement locus of an opening of the second hole is included in the second groove. The first groove and the second groove at least partially overlap with each other in the radial direction.

## Claims

### Claim 1

A scroll compressor comprising:
a hermetic container;
an electric motor having a stator and a rotor and housed in the hermetic container;
a shaft having an oil supply path in which lubricant oil flows and rotating integrally with the rotor;
a fixed scroll having a spiral fixed wrap;
a revolving scroll having a spiral revolving wrap and provided such that a compression chamber is formed between the fixed wrap and the revolving wrap; and
a frame having an insertion hole for the shaft and supporting the fixed scroll,
wherein a back pressure chamber is provided between the revolving scroll and the frame,
at an end plate surface of the fixed scroll, an annular back pressure groove connected to the back pressure chamber is provided, and an arc-shaped first groove and an arc-shaped second groove are provided inside the back pressure groove in a radial direction,
a distance between the second groove and the back pressure groove is shorter than a distance between the first groove and the back pressure groove,
the revolving scroll is provided with a first hole and a second hole for guiding the lubricant oil from the oil supply path to an end plate surface side of the fixed scroll,
at least part of a movement locus of an opening of the first hole is included in the first groove,
at least part of a movement locus of an opening of the second hole is included in the second groove, and
the first groove and the second groove at least partially overlap with each other in the radial direction.

### Claim 2 (depends on 1)

The scroll compressor according to claim 1, wherein
a length of the arc-shaped second groove in a circumferential direction is shorter than a length of the arc-shaped first groove in the circumferential direction.

### Claim 3 (depends on 1)

The scroll compressor according to claim 1, wherein
a length of the arc-shaped second groove in the circumferential direction is longer than a diameter of the circular movement locus of the opening of the second hole, and
the arc-shaped second groove and the circular movement locus of the opening of the second hole cross each other at two locations.

### Claim 4 (depends on 1)

The scroll compressor according to claim 1, wherein
a center angle of the arc-shaped second groove is equal to or greater than 10° and equal to or less than 30°.

### Claim 5 (depends on 1)

The scroll compressor according to claim 1, wherein
a recessed portion connected to the second groove is provided at the end plate surface of the fixed scroll, and
the movement locus of the opening of the second hole is included in a region of the recessed portion.

### Claim 6 (depends on 1)

The scroll compressor according to claim 1, wherein
a recessed portion connected to the second groove is provided at the end plate surface of the fixed scroll, and
not only part of the movement locus of the opening of the second hole but also part of the movement locus of the opening of the first hole are included in a region of the recessed portion.

### Claim 7 (depends on 1)

The scroll compressor according to claim 1, wherein
not only at least part of the movement locus of the opening of the second hole but also at least part of the movement locus of the opening of the first hole are included in the second groove.

### Claim 8 (depends on 1)

The scroll compressor according to claim 1, wherein
at least part of the movement locus of the opening of the first hole is included in the first groove, but the movement locus of the opening of the second hole is not included in the first groove.

### Claim 9 (depends on 1)

A refrigeration cycle device comprising:
the scroll compressor according to claim 1;
an outdoor heat exchanger;
an expansion valve; and
an indoor heat exchanger.

### Claim 10

A scroll compressor comprising:
a hermetic container;
an electric motor having a stator and a rotor and housed in the hermetic container;
a shaft having an oil supply path in which lubricant oil flows and rotating integrally with the rotor;
a fixed scroll having a spiral fixed wrap;
a revolving scroll having a spiral revolving wrap and provided such that a compression chamber is formed between the fixed wrap and the revolving wrap; and
a frame having an insertion hole for the shaft and supporting the fixed scroll,
wherein a back pressure chamber is provided between the revolving scroll and the frame,
at an end plate surface of the fixed scroll, an annular back pressure groove connected to the back pressure chamber is provided, and an arc-shaped first groove and an arc-shaped second groove are provided inside the back pressure groove in a radial direction,
a distance between the second groove and the back pressure groove is shorter than a distance between the first groove and the back pressure groove,
the revolving scroll is provided with a first hole and a second hole for guiding the lubricant oil from the oil supply path to an end plate surface side of the fixed scroll,
at least part of a movement locus of an opening of the first hole is included in the first groove,
at least part of a movement locus of an opening of the second hole is included in the second groove, and
a connection hole connected to the oil supply path and connected to both of the first hole and the second hole is provided at the revolving scroll.

### Claim 11 (depends on 10)

The scroll compressor according to claim 10, wherein
a length of the arc-shaped second groove in a circumferential direction is shorter than a length of the arc-shaped first groove in the circumferential direction.

### Claim 12 (depends on 10)

The scroll compressor according to claim 10, wherein
a length of the arc-shaped second groove in the circumferential direction is longer than a diameter of the circular movement locus of the opening of the second hole, and
the arc-shaped second groove and the circular movement locus of the opening of the second hole cross each other at two locations.

### Claim 13 (depends on 10)

The scroll compressor according to claim 10, wherein
a center angle of the arc-shaped second groove is equal to or greater than 10° and equal to or less than 30°.

### Claim 14 (depends on 10)

The scroll compressor according to claim 10, wherein
a recessed portion connected to the second groove is provided at the end plate surface of the fixed scroll, and
the movement locus of the opening of the second hole is included in a region of the recessed portion.

### Claim 15 (depends on 10)

The scroll compressor according to claim 10, wherein
a recessed portion connected to the second groove is provided at the end plate surface of the fixed scroll, and
not only part of the movement locus of the opening of the second hole but also part of the movement locus of the opening of the first hole are included in a region of the recessed portion.

### Claim 16 (depends on 10)

The scroll compressor according to claim 10, wherein
not only at least part of the movement locus of the opening of the second hole but also at least part of the movement locus of the opening of the first hole are included in the second groove.

### Claim 17 (depends on 10)

The scroll compressor according to claim 10, wherein
at least part of the movement locus of the opening of the first hole is included in the first groove, but the movement locus of the opening of the second hole is not included in the first groove.

### Claim 18 (depends on 10)

A refrigeration cycle device comprising:
the scroll compressor according to claim 10;
an outdoor heat exchanger;
an expansion valve; and
an indoor heat exchanger.