Scroll compressor

Patent metadata

Field	Value
Publication number	US-12467456-B2
Application number	US-202218277423-A
Country	US
Kind code	B2
Filing date	Jan 18, 2022
Priority date	Feb 19, 2021
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

A scroll compressor including an orbiting scroll that performs an orbiting motion; a fixed scroll coupled to the orbiting scroll so as to form a compression chamber; and a main frame that rotatably supports the orbiting scroll at an opposite side of the fixed scroll with the orbiting scroll interposed therebetween, and supportably connected to the fixed scroll. The fixed scroll is provided with a back pressure hole formed between a first back pressure chamber in which gas discharged from the compression chamber is received, and the compression chamber. The back pressure hole may communicate with the first back pressure chamber and the compression chamber on the basis of a predetermined pressure ratio of the compression chamber.

First claim

The invention claimed is:

1 . A scroll compressor, comprising:
an orbiting scroll configured to perform an orbital motion; a fixed scroll coupled to the orbiting scroll to define a compression chamber; and a main frame that rotatably support the orbiting scroll at an opposite side of the fixed scroll with the orbiting scroll interposed therebetween, the main frame supporting the fixed scroll, wherein the fixed scroll is provided with a back pressure hole disposed between the compression chamber and a first back pressure chamber in which gas discharged from the compression chamber is received, wherein the back pressure hole is configured to communicate with the first back pressure chamber and the compression chamber on a basis of a predetermined pressure ratio of the compression chamber, wherein the orbiting scroll comprises an orbiting end plate having a disc shape with a predetermined width, the orbiting end plate supporting the fixed scroll, wherein at least one end plate groove is disposed at a side portion of one surface of the orbiting end plate along a circumferential direction, and wherein the at least one end plate groove is disposed at a position at which the at least one end plate groove is capable of communicating with the back pressure hole during an orbiting motion of the orbiting scroll, wherein the at least one end plate groove comprises a plurality of end plate grooves provided on the one surface of the orbiting end plate, wherein the plurality of end plate grooves is disposed at both sides with respect to a center of the orbiting end plate, wherein a distance from a first side of each of the plurality of end plate grooves to an outer portion of the compression chamber is greater than a distance from a second side of each of the plurality of end plate grooves to an outer circumference of the orbiting end plate, and wherein each of the plurality of end plate grooves is disposed adjacent to the outer circumference of the orbiting end plate and spaced apart therefrom by a sealing distance.

2 . The scroll compressor of claim 1 , wherein the back pressure hole comprises:
a first flow path that extends in a direction parallel to a vertical direction; and a second flow path that communicates with the first flow path and extends in a direction parallel to a lateral direction.

3 . The scroll compressor of claim 2 , wherein the first flow path comprises:
a compression communication flow path into which the gas discharged from the compression chamber flows; and a back pressure communication flow path that communicates with the compression communication flow path and the first back pressure chamber to provide gas flowing through the compression communication flow path into the first back pressure chamber.

4 . The scroll compressor of claim 3 , wherein the second flow path is disposed between the compression communication flow path and the back pressure communication flow path.

5 . The scroll compressor of claim 3 , wherein a guide inlet that is configured to guide the discharged gas to flow into the first back pressure chamber and communicates with the back pressure hole is disposed on a lower surface of the fixed scroll.

6 . The scroll compressor of claim 3 , wherein the second flow path comprises a pressure control pin configured to control a flow of the gas into the first back pressure chamber.

7 . The scroll compressor of claim 2 , wherein the first and second flow paths are disposed on an inner portion of the fixed scroll with reference to an outer diameter of the orbiting end plate.

8 . The scroll compressor of claim 2 , wherein a second back pressure chamber having a width corresponding to a predetermined distance from the center of the orbiting end plate is disposed below the orbiting end plate, and wherein a back pressure opening in communication with the second back pressure chamber and a lower surface of the fixed scroll is disposed in the orbiting end plate.

9 . The scroll compressor of claim 8 , wherein the back pressure opening comprises:
a first passage that extends in a direction parallel to the vertical direction; and a second passage that is configured to communicate with the first passage and that extends in a direction parallel to the lateral direction.

10 . The scroll compressor of claim 9 , wherein the first passage comprises:
a back pressure chamber communication flow path into which gas discharged from the second back pressure chamber flows; and a fixed communication flow path that communicates with the back pressure chamber communication flow path, and configured to communicate with the lower surface of the fixed scroll to provide gas flowing through the back pressure chamber communication flow path to the lower surface of the fixed scroll.

11 . The scroll compressor of claim 10 , wherein a fixing groove is disposed in the lower surface of the fixed scroll configured to communicate with the fixed communication flow path.

12 . The scroll compressor of claim 9 , wherein a pressure control pin configured to control gas leakage from the second back pressure chamber is disposed in the second passage.

13 . The scroll compressor of claim 1 , wherein the first back pressure chamber is disposed between an upper surface of the main frame, a side portion of the orbiting scroll, and a lower surface of the fixed scroll.

14 . The scroll compressor of claim 1 , wherein the plurality of end plate grooves is disposed to be symmetrical to each other with respect to the center of the orbiting end plate.

15 . The scroll compressor of claim 1 , wherein as pressure outside of the fixed scroll is decreased, when the orbiting scroll moves backward in an axial direction, gas flows into the plurality of end plate grooves and pressure in the first back pressure chamber rises pressing the orbiting end plate in an axial direction to be coupled to the fixed scroll.

16 . A scroll compressor, comprising:
an orbiting scroll configured to perform an orbital motion; a fixed scroll coupled to the orbiting scroll to define a compression chamber; a main frame configured to rotatably support the orbiting scroll at an opposite side of the fixed scroll with the orbiting scroll interposed therebetween, the main frame supporting the fixed scroll; and a casing in which the orbiting scroll, the fixed scroll, and the main frame are disposed, wherein the fixed scroll is provided with a back pressure hole disposed between the compression chamber and a first back pressure chamber in which gas discharged from the compression chamber is received, wherein the back pressure hole is configured to communicate with the first back pressure chamber and the compression chamber on a basis of a predetermined pressure ratio of the compression chamber, wherein the orbiting scroll comprises an orbiting end plate having a disc shape with a predetermined width, the orbiting end plate supporting the fixed scroll, wherein at least one end plate groove is disposed at a side portion of one surface of the orbiting end plate along a circumferential direction, wherein the at least one end plate groove is disposed at a position at which the at least one end plate groove is configured to communicate with the back pressure hole during an orbiting motion of the orbiting scroll, wherein the at least one end plate groove comprises a plurality of end plate grooves provided on the one surface of the orbiting end plate, wherein the plurality of end plate grooves is disposed at both sides with respect to a center of the orbiting end plate, wherein a distance from a first side of each of the plurality of end plate g

Assignees

• Lg Electronics Inc

Inventors

• Moon Jehyeon
• Yoo Byungkil

Classifications

• F04C23/008

  Hermetic pumps · CPC title

• F04C29/0021

  Systems for the equilibration of forces acting on the pump (interstice adjustment other than by fluid pressure F01C21/102) · CPC title

• F04C27/005

  Axial sealings for working fluid · CPC title

• F04C18/0261

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

• F04C29/0028

  Internal leakage control · CPC title