Scroll compressor

Patent metadata

Field	Value
Publication number	US-12098724-B2
Application number	US-202318138920-A
Country	US
Kind code	B2
Filing date	Apr 25, 2023
Priority date	Sep 6, 2022
Publication date	Sep 24, 2024
Grant date	Sep 24, 2024

Abstract

A scroll compressor is disclosed. The scroll compressor may include a back pressure hole formed through a non-orbiting scroll and a back pressure chamber assembly such that a compression chamber and a back pressure chamber communicate with each other. A back pressure valve may be disposed inside of the back pressure hole and move along a longitudinal direction of the back pressure hole by a pressure difference between the compression chamber and the back pressure chamber, to vary a flow path area of the back pressure hole. The back pressure valve may include a valve body that extends in an axial direction and a plurality of holes formed through the valve body in the axial direction. With the configuration, pressure pulsation in the back pressure chamber may be suppressed or prevented.

First claim

What is claimed is:

1. A scroll compressor, comprising:
a casing;
a high/low pressure separation plate that is fixed to an inside of the casing and partitions a low-pressure portion defining a suction space and a high-pressure portion defining a discharge space;
a main frame fixed to the inside of the casing and disposed in the low-pressure portion;
an orbiting scroll supported on the main frame in an axial direction of the scroll compressor to perform an orbiting motion;
a non-orbiting scroll that is movable relative to one side surface of the main frame in the axial direction with the orbiting scroll interposed therebetween and forms a compression chamber together with the orbiting scroll;
a back pressure chamber assembly disposed between the high/low pressure separation plate and the non-orbiting scroll and having a back pressure chamber formed in an annular shape; and
at least one back pressure hole formed through the non-orbiting scroll and a fixed back pressure plate of the back pressure chamber assembly such that the compression chamber and the back pressure chamber communicate with each other, wherein the at least one back pressure hole comprises a scroll-side back pressure hole that is formed in the non-orbiting scroll and communicates with the compression chamber, and a plate-side back pressure hole that is formed in the fixed back pressure plate of the back pressure chamber assembly and communicates with the scroll-side back pressure hole and the back pressure chamber, wherein a back pressure valve is disposed inside of the scroll-side back pressure hole to perform a sliding motion, and wherein the back pressure valve includes a valve body that is movable and extends in the axial direction, and a plurality of holes formed through the valve body in the axial direction.

2. The scroll compressor of claim 1 , wherein the plurality of holes of the back pressure valve comprises:
a first hole formed in a compression chamber-side end portion of the valve body; and
a second hole that communicates with the first hole and extends from the first hole to a back pressure chamber-side end portion of the valve body, wherein an inner diameter of the second hole is larger than an inner diameter of the first hole.

3. The scroll compressor of claim 2 , wherein the back pressure valve includes a side hole that communicates with the second hole and is formed between the compression chamber-side end portion and the back pressure chamber-side end portion, and wherein an inner diameter of the side hole is larger than the inner diameter of the first hole.

4. The scroll compressor of claim 1 , wherein the valve body comprises:
a main body disposed on a side of the back pressure chamber;
an extension body that extends from the main body in the axial direction and disposed on a side of the compression chamber; and
a pressing surface formed in a boundary region between the main body and the extension body, and wherein a cross-sectional area of the main body in a radial direction of the scroll compressor is larger than a cross-sectional area of the extension body in the radial direction.

5. The scroll compressor of claim 4 , wherein the plurality of holes of the back pressure valve include a first hole and a second hole, wherein the first hole is formed in a compression chamber-side end portion of the extension body, wherein the second hole communicates with the first hole and extends from the first hole to a back pressure chamber-side end portion of the main body, and wherein an inner diameter of the second hole is larger than an inner diameter of the first hole.

6. The scroll compressor of claim 5 , wherein the back pressure valve includes a side hole formed in a side surface of the valve body, wherein the side hole communicates with the second hole and is formed in the side surface between the compression chamber-side end portion of the extension body and the pressing surface, and wherein an inner diameter of the side hole is larger than the inner diameter of the first hole.

7. The scroll compressor of claim 5 , wherein the valve body comprises an inclined portion on the compression chamber-side end portion of the extension body, and wherein the inclined portion is formed such that an outer diameter of the inclined portion gradually decreases toward a circumference of the first hole.

8. The scroll compressor of claim 5 , wherein the scroll-side back pressure hole comprises:
a first scroll-side back pressure hole that communicates with the plate-side back pressure hole and a second scroll-side back pressure hole having a first end portion that communicates with the first scroll-side back pressure hole and a second end portion that communicates with the compression chamber, wherein an inner diameter of the first scroll-side back pressure hole is larger than an inner diameter of the second scroll-side back pressure hole, and wherein the back pressure valve is inserted into the first scroll-side back pressure hole.

9. The scroll compressor of claim 8 , wherein a stepped portion is formed between the first scroll-side back pressure hole and the second scroll-side back pressure hole to restrict movement of the back pressure valve, and wherein the stepped portion is inclined in a direction toward the second scroll-side back pressure hole.

10. The scroll compressor of claim 8 , wherein the inner diameter of the first hole is smaller than the inner diameter of the second scroll-side back pressure hole.

11. The scroll compressor of claim 8 , wherein an inner diameter of the extension body is larger than the inner diameter of the second scroll-side back pressure hole.

12. The scroll compressor of claim 1 , wherein a portion of the scroll-side back pressure hole is covered by one surface of the back pressure chamber assembly, and wherein the back pressure valve axially overlaps the one surface of the back pressure chamber assembly that covers the scroll-side back pressure hole.

13. The scroll compressor of claim 1 , wherein a length of the at least one back pressure hole from a first end at the compression chamber to a second end at the back pressure chamber is coaxially aligned with a central axis.

14. A scroll compressor, comprising:
a casing;
a high/low pressure separation plate that is fixed to an inside of the casing and partitions a low-pressure portion defining a suction space and a high-pressure portion defining a discharge space;
a main frame fixed to the inside of the casing and disposed in the low-pressure portion;
an orbiting scroll supported on the main frame in an axial direction of the scroll compressor to perform an orbiting motion;
a non-orbiting scroll that is movable relative to one side surface of the main frame in the axial direction with the orbiting scroll interposed therebetween and forms a compression chamber together with the orbiting scroll;
a back pressure chamber assembly disposed between the high/low pressure separation plate and the non-orbiting scroll and having a back pressure chamber formed in an annular shape; and
at least one back pressure hole formed through the non-orbiting scroll and a fixed back pressure plate of the back pressure chamber assembly such that the compression chamber and the back pressure chamber communicate with each other, wherein the at least one back pressure hole comprises a scroll-side back pressure hole that is formed in the non-orbiting scroll and communicates with the compression chamber, and a plate-side back pressure hole that is formed in the fixed back pressure plate of the back pressure chamber assembly and communicates with the scroll-side back pressure hole and the back pressure chambe

Assignees

• Lg Electronics Inc

Inventors

• Jo Changeol
• Kim Jeonghun
• Han Nara
• Park Jihoon

Classifications

• F04C18/0261

  Details of the ports, e.g. location, number, geometry · CPC title

• F04C18/0215 Primary

  where only one member is moving · CPC title

• F04C29/0035

  Equalization of pressure pulses (silencing F04C29/06) · CPC title

• F05B2210/14

  Refrigerants with particular properties, e.g. HFC-134a · CPC title

• F05B2240/20

  Rotors · CPC title