Scroll compressor

Patent metadata

Field	Value
Publication number	US-12398722-B2
Application number	US-202418588301-A
Country	US
Kind code	B2
Filing date	Feb 27, 2024
Priority date	Mar 23, 2023
Publication date	Aug 26, 2025
Grant date	Aug 26, 2025

Abstract

A scroll compressor is provided that may include an orbiting scroll, a non-orbiting scroll, a back pressure chamber assembly, a back pressure passage, and a flow resistance portion. The back pressure passage may provide communication between a compression chamber and a back pressure chamber, and the flow resistance portion may be disposed at a middle portion of the back pressure passage to reduce an amount of refrigerant flowing through the back pressure passage. This may reduce a substantial cross-sectional area of the back pressure passage while improving machining of the back pressure passage, thereby decreasing an amount of refrigerant flowing between the compression chamber and the back pressure chamber. Accordingly, pressure pulsation in the back pressure chamber may be lowered and sealing stability between the orbiting scroll and the non-orbiting scroll may be enhanced, thereby improving compression performance.

First claim

What is claimed is:

1. A scroll compressor, comprising:
a casing having a low-pressure portion and a high-pressure portion;
an orbiting scroll coupled to a rotary shaft in the low-pressure portion of the casing to perform an orbiting motion;
a non-orbiting scroll engaged with the orbiting scroll to form a compression chamber and movable relative to the orbiting scroll in an axial direction;
a back pressure chamber assembly disposed on a rear surface of the non-orbiting scroll to form a back pressure chamber;
a back pressure passage defined such that the compression chamber and the back pressure chamber communicate with each other; and
a flow resistance portion disposed at a middle portion of the back pressure passage to reduce an amount of refrigerant flowing through the back pressure passage, wherein the flow resistance portion is press-fitted into the back pressure passage, wherein at least one refrigerant passage groove is recessed laterally into an inner circumferential surface of the back pressure passage to be spaced apart from an outer circumferential surface of the flow resistance portion, and wherein the at least one refrigerant passage groove has a cross-sectional area that is smaller than a cross-sectional area of the flow resistance portion.

2. The scroll compressor of claim 1 , wherein a refrigerant passage is defined between the inner circumferential surface of the back pressure passage and the outer circumferential surface of the flow resistance portion, and wherein the refrigerant passage has a cross-sectional area smaller than the cross-sectional area of the flow resistance portion.

3. The scroll compressor of claim 1 , wherein the back pressure passage comprises:
a scroll back pressure hole disposed in the non-orbiting scroll so that one end thereof communicates with the compression chamber; and
a plate back pressure hole disposed in the back pressure chamber assembly so that a first end thereof communicates with the scroll back pressure hole and a second end communicates with the back pressure chamber, and wherein the flow resistance portion is inserted across between the scroll back pressure hole and the plate back pressure hole.

4. The scroll compressor of claim 3 , wherein the scroll back pressure hole comprises:
a small-diameter portion having a first end that communicates with the compression chamber; and
a large-diameter portion that extends from a second end of the small-diameter portion toward the plate back pressure hole, wherein a first end of the flow resistance portion is inserted into the large-diameter portion and a second end of the flow resistance portion is inserted into the plate back pressure hole, and wherein the cross-sectional area of the flow resistance portion is smaller than a cross-sectional area of the large-diameter portion and larger than a cross-sectional area of the small-diameter portion.

5. The scroll compressor of claim 4 , wherein a refrigerant passage is defined between the outer circumferential surface of the flow resistance portion and an inner circumferential surface of the large-diameter portion, and wherein the refrigerant passage has a cross-sectional area smaller than or equal to the cross-sectional area of the small-diameter portion.

6. A scroll compressor, comprising:
a casing having a low-pressure portion and a high-pressure portion;
an orbiting scroll coupled to a rotary shaft in the low-pressure portion of the casing to perform an orbiting motion;
a non-orbiting scroll engaged with the orbiting scroll to form a compression chamber and movable relative to the orbiting scroll in an axial direction;
a back pressure chamber assembly disposed on a rear surface of the non-orbiting scroll to form a back pressure chamber;
a back pressure passage defined such that the compression chamber and the back pressure chamber communicate with each other; and
a flow resistance portion disposed at a middle portion of the back pressure passage to reduce an amount of refrigerant flowing through the back pressure passage, wherein the back pressure passage comprises:
a scroll back pressure hole disposed in the non-orbiting scroll so that one end thereof communicates with the compression chamber; and
a plate back pressure hole disposed in the back pressure chamber assembly so that a first end thereof communicates with the scroll back pressure hole and a second end communicates with the back pressure chamber, and wherein the flow resistance portion comprises:
a first flow resistance portion inserted into the scroll back pressure hole; and
a second flow resistance portion disposed at one side of the first flow resistance portion in the axial direction at a spacing from the first flow resistance portion, and inserted into the plate back pressure hole, wherein the scroll back pressure hole comprises:
a small-diameter portion having a first end that communicates with the compression chamber; and
a large-diameter portion that extends from a second end of the small-diameter portion toward the plate back pressure hole, wherein a first refrigerant passage is defined between an outer circumferential surface of the first flow resistance portion and an inner circumferential surface of the large-diameter portion, wherein the first refrigerant passage has a cross-sectional area smaller than or equal to a cross-sectional area of the small-diameter portion, wherein a second refrigerant passage is defined between an outer circumferential surface of the second flow resistance portion and an inner circumferential surface of the plate back pressure hole, and wherein the second refrigerant passage has a cross-sectional area smaller than or equal to the cross-sectional area of the small-diameter portion.

7. The scroll compressor of claim 6 , wherein a first end of the second flow resistance portion is disposed to face one end of the first flow resistance portion, and a second end of the second flow resistance portion is fixed to the back pressure chamber assembly.

8. The scroll compressor of claim 6 , wherein a communication groove is formed stepwise in an axial direction in one end of the first flow resistance portion facing the small-diameter portion, and wherein the communication groove communicates with the first refrigerant passage.

9. The scroll compressor of claim 6 , wherein a communication groove is formed stepwise in the axial direction in one end of the second flow resistance portion facing the first flow resistance portion, and wherein the first refrigerant passage and the second refrigerant passage communicate with the communication groove.

10. The scroll compressor of claim 9 , wherein the second flow resistance portion is supported in the axial direction by a fastening member fastened to the back pressure chamber assembly.

11. A scroll compressor, comprising:
a casing having a low-pressure portion and a high-pressure portion;
an orbiting scroll coupled to a rotary shaft in the low-pressure portion of the casing to perform an orbiting motion;
a non-orbiting scroll engaged with the orbiting scroll to form a compression chamber and movable relative to the orbiting scroll in an axial direction;
a back pressure chamber assembly disposed on a rear surface of the non-orbiting scroll to form a back pressure chamber;
a back pressure passage defined such that the compression chamber and the back pressure chamber communicate with each other; and
a flow resistance portion disposed at a middle portion of the back pressure passage to reduce an amount of refrigerant flowing through the back pressure passage, wherein a gasket is disposed between the non-orbiting scroll and the back pressure chamber assembly, and wherein the flow resistance portion ext

Assignees

• Lg Electronics Inc

Inventors

• Park Honghee
• Kim Wooyoung
• Yu Byeonghun

Classifications

• F04C29/12

  Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet · CPC title

• F04C18/0261

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

• F04C2210/26

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