# US 7,744,357 B2 · Scroll compressor

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- Number: US 7,744,357 B2
- Document ID: US7744357B2
- Status: Granted
- Kind: B2
- Application number: 11/609,482
- Filed: 2006-12-12
- Published: 2007-06-21
- Granted: 2010-06-29
- Earliest claimed: 2005-12-12
- Assignees: LG Electronics Inc.
- Inventors: Seung Yup Kim; Myung Kyun Kim; Byung Kil Yoo
- Web page: https://patentgrep.com/patent/US7744357B2

## CPC

- F04C 29/065: {Noise dampening volumes, e.g. muffler chambers}
- F04C 23/008: {Hermetic pumps}
- F04C 29/068: {the silencing means being arranged inside the pump housing}
- F04C 18/0215: {where only one member is moving}
- Y10S 418/01: Non-working fluid separation
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A scroll compressor includes a fixed scroll, an orbiting scroll orbiting the fixed scroll to perform compression on a refrigerant, a discharge cover provided at an upper end of the fixed scroll and guiding discharge of a compressed refrigerant, a first discharge chamber from which the compressed refrigerant is discharged; a second discharge chamber communicating with the first discharge chamber and separating oil from the discharged refrigerant, and a third discharge chamber communicating with the second discharge chamber and guiding discharge of the separated refrigerant.

## Claims

### Claim 1

A scroll compressor, comprising:
a fixed scroll;
an orbiting scroll configured to orbit the fixed scroll to perform compression on a refrigerant;
a discharge cover provided at an upper end of the fixed scroll and guiding discharge of a compressed refrigerant;
a cover member that covers the discharge cover and includes a discharge pipe to discharge the compressed refrigerant to outside;
a first discharge chamber from which the compressed refrigerant is discharged;
a second discharge chamber communicating with the first discharge chamber and separating oil from the discharged refrigerant;
a third discharge chamber communicating with the second discharge chamber and guiding discharge of the separated refrigerant, and
a discharge passage provided between the cover member and the discharge cover and that communicates with the third chamber and the discharge pipe, wherein the discharge cover includes an extending portion spaced apart from the discharge pipe and extended toward the fixed scroll and the extending portion defines the third discharge chamber.

### Claim 2 (depends on 1)

The scroll compressor according to claim 1, wherein the first discharge chamber is formed at a central portion of the fixed scroll.

### Claim 3 (depends on 1)

The scroll compressor according to claim 1, wherein the second discharge chamber is formed between the fixed scroll and the discharge cover.

### Claim 4 (depends on 1)

The scroll compressor according to claim 1, wherein the extending portion extends downwardly from a lower surface of the discharge cover.

### Claim 5 (depends on 1)

The scroll compressor according to claim 1, wherein the third discharge chamber is formed inside the second discharge chamber.

### Claim 6 (depends on 1)

The scroll compressor according to claim 1, wherein the discharge cover comprises:
a discharge guiding portion guiding discharge of a compressed refrigerant and oil; and
an engagement portion extending from a lower end of the discharge guiding portion and coupled to the fixed scroll.

### Claim 7 (depends on 1)

The scroll compressor according to claim 1, wherein the fixed scroll comprises:
an oil return path through which separated oil returns; and
an oil return portion communicating with the oil return path and guiding flow of the returning oil.

### Claim 8 (depends on 7)

The scroll compressor according to claim 7, wherein the oil return path includes an inlet formed at an upper surface of the fixed scroll, and an outlet formed at a side surface of the fixed scroll.

### Claim 9 (depends on 7)

The scroll compressor according to claim 7, wherein the oil return path comprises a capillary pipe facilitating return of oil.

### Claim 10 (depends on 7)

The scroll compressor according to claim 7, wherein the oil return portion comprises:
a coupling member coupled to a side surface of the fixed scroll; and
an oil return pipe having a predetermined length, coupled to the coupling member and communicating with the oil return path,
wherein the oil return pipe extends downwardly.

### Claim 11 (depends on 10)

The scroll compressor according to claim 10, wherein the oil return pipe comprises a capillary pipe, the capillary pipe is provided inside of the oil return pipe.

### Claim 12 (depends on 1)

The scroll compressor according to claim 1, wherein the discharge chambers have different cross-sectional areas.

### Claim 13

A scroll compressor, comprising:
a scroll compression unit including a fixed scroll and an orbiting scroll configured to orbit the fixed scroll and performing compression on a fluid;
a discharge cover provided at an upper end of the scroll compression unit and serving to reduce noise generated when a compressed fluid is discharged;
a plurality of discharge chambers guiding discharge of a fluid compressed in the scroll compression unit;
an oil return path formed in the fixed scroll through which oil separated from a fluid returns while the fluid is flowing inside the plurality of discharge chambers;
an oil return pipe communicated with the oil return path; and
a coupling member coupled to a side surface of the fixed scroll and connecting the oil return pipe and the fixed scroll,
wherein the oil return pipe is provided outside of the fixed scroll and extended downwardly.

### Claim 14 (depends on 13)

The scroll compressor according to claim 13, wherein the plurality of discharge chambers comprise:
a first discharge chamber formed at the fixed scroll;
a second discharge chamber formed between the fixed scroll and the discharge cover; and
a third discharge chamber formed inside the second discharge chamber.

### Claim 15 (depends on 14)

The scroll compressor according to claim 14, wherein an extending part is extended downwardly from a lower surface of the discharge cover, the extending part defines the third chamber.

### Claim 16 (depends on 14)

The scroll compressor according to claim 14, further comprising that covers the discharge cover and including a discharge pipe to discharge the compressed fluid to outside and a discharge passage provided between the cover member and the discharge cover and that communicating the third chamber and the discharge pipe.

### Claim 17 (depends on 13)

The scroll compressor according to claim 13, wherein the plurality of chambers have different cross-sectional areas.

### Claim 18 (depends on 13)

The scroll compressor according to claim 13, wherein the oil return path includes a capillary pipe therein.

### Claim 19

A scroll compressor, comprising:
a casing;
a cover member having a discharge pipe and coupled to the casing;
a division member dividing the inside of the casing and the cover member into a low-pressure portion and a high-pressure portion;
a fixed scroll coupled to a lower side of the division member;
an orbiting scroll configured to orbit the fixed scroll and performing compression on a fluid;
a first discharge chamber formed at the fixed scroll and from which a compressed refrigerant is discharged;
a second discharge chamber formed between the fixed scroll and the division member and separating oil from the discharge refrigerant; and
a third discharge chamber communicating with the second discharge chamber and from which the separated refrigerant is discharged,
wherein the division member includes a separation portion extended towards the fixed scroll from the division member, the separation portion defines the third chamber therein and is spaced apart from the discharge pipe, the division member and the cover member defines at least a portion of the high pressure portion.