# US 12,000,394 B2 · Scroll compressor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,000,394 B2 - Document ID: US12000394B2 - Status: Granted - Kind: B2 - Application number: 17/993,605 - Filed: 2022-11-23 - Published: 2023-07-20 - Granted: 2024-06-04 - Earliest claimed: 2022-01-14 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Gunyoung Park; Seokhwan Moon; Kitae Jang; Jongtae Her - Web page: https://patentgrep.com/patent/US12000394B2 ## CPC - F04C 18/0215: {where only one member is moving} - F01C 17/063: {with only rolling movement} - F04C 23/008: {Hermetic pumps} - F04C 29/0042: {Driving elements, brakes, couplings, transmissions specially adapted for pumps (brakes, couplings, transmissions per se F16, B60)} - F04C 29/0057: {for eccentric movement} - F04C 2270/16: Wear - F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS - F01C: ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES (internal-combustion aspects F02B53/00, F02B55/00) ## Abstract A scroll compressor is disclosed. The scroll compressor may include an anti-rotation mechanism provided with an anti-rotation pin and an anti-rotation ring between an orbiting scroll and a scroll support member facing the orbiting scroll, and an axial thickness of the ring body portion constituting the anti-rotation ring may be larger than an axial depth of a ring insertion groove in which the anti-rotation ring is inserted. This can allow the orbiting scroll and a member facing the same to be spaced physically apart without a separate member, to secure a gap for oil to flow, such that the oil can be smoothly supplied between the orbiting scroll and the member, thereby suppressing seizure or/and friction loss between the orbiting scroll and the member. ## Claims ### Claim 1 A scroll compressor comprising: a casing; a fixed scroll disposed in the casing; an orbiting scroll configured to engage the fixed scroll and define a compression chamber together with the fixed scroll; a scroll support member disposed at a side of the orbiting scroll in an axial direction and configured to support the orbiting scroll in the axial direction; an anti-rotation pin disposed at one of a side surface of the orbiting scroll or a side surface of the scroll support member facing the side surface of the orbiting scroll; a ring insertion groove defined at a side surface of a portion that faces the anti-rotation pin; and an anti-rotation ring including: a ring body portion inserted into the ring insertion groove and configured to rotate relative to the ring insertion groove, and a pin coupling portion disposed at the ring body portion and configured to couple the anti-rotation pin, wherein an axial thickness of the ring body portion is greater than an axial depth of the ring insertion groove, wherein an oil groove is defined at a side surface of the scroll support member facing the orbiting scroll, wherein the oil groove fluidly connects an outer circumferential surface to an inner circumferential surface of the scroll support member, and wherein the oil groove includes: a plurality of first oil grooves that extend between the outer circumferential surface and the inner circumferential surface of the scroll support member and that are spaced apart from each other along a circumferential direction of the scroll support member, and at least one second oil groove that is defined in an annular shape along the circumferential direction of the scroll support member and that is in fluid communication with the plurality of first oil grooves. ### Claim 2 (depends on 1) The scroll compressor of claim 1, wherein the axial thickness of the ring body portion is smaller than or equal to twice the axial depth of the ring insertion groove. ### Claim 3 (depends on 1) The scroll compressor of claim 1, wherein the pin coupling portion is offset from a center of the ring body portion. ### Claim 4 (depends on 1) The scroll compressor of claim 1, wherein the pin coupling portion is defined through side surfaces of the ring body portion in the axial direction or recessed from one of the side surfaces of the ring body portion, and wherein an inner diameter of the pin coupling portion is larger than an outer diameter of the anti-rotation pin. ### Claim 5 (depends on 4) The scroll compressor of claim 4, wherein a first end of the anti-rotation pin is fixed to the scroll support member, and a second end of the anti-rotation pin is rotatably coupled to the pin coupling portion. ### Claim 6 (depends on 1) The scroll compressor of claim 1, wherein the anti-rotation pin extends integrally from the pin coupling portion, and wherein a pin insertion groove is defined at the scroll support member and receives the anti-rotation pin to enable the anti-rotation pin to rotate. ### Claim 7 (depends on 1) The scroll compressor of claim 1, wherein a weight-reducing portion is defined through side surfaces of the ring body portion in the axial direction or recessed from one of the side surfaces of the ring body portion. ### Claim 8 (depends on 1) The scroll compressor of claim 1, wherein an oil separator is disposed outside the casing and configured to separate oil from refrigerant discharged from the casing, wherein an oil return pipe connects the oil separator and an inside of the casing, and wherein the oil return pipe is connected to the inside of the casing at a position that faces a portion between the orbiting scroll and the scroll support member in a radial direction. ### Claim 9 (depends on 1) The scroll compressor of claim 1, wherein a weight-reducing portion is recessed from one of the side surfaces of the ring body portion. ### Claim 10 (depends on 1) The scroll compressor of claim 1, wherein the ring body portion has a disk shape and is entirely blocked except for the pin coupling portion. ### Claim 11 (depends on 10) The scroll compressor of claim 10, wherein the ring body portion has a consistent height. ### Claim 12 (depends on 1) The scroll compressor of claim 1, wherein the ring body portion includes a weight-reducing portion at a side of the pin coupling portion. ### Claim 13 (depends on 12) The scroll compressor of claim 12, wherein the ring body portion includes a reinforcing portion that is disposed between the weight-reducing portion and the pin coupling portion and surrounds the pin coupling portion. ### Claim 14 (depends on 13) The scroll compressor of claim 13, wherein an area of the reinforcing portion is smaller than or equal to an area of the weight-reducing portion. ### Claim 15 (depends on 13) The scroll compressor of claim 13, wherein the reinforcing portion is provided based on the weight-reducing portion being spaced apart from the pin coupling portion in a radial direction, and wherein an outer circumferential surface of the reinforcing portion includes a curved surface having the same center as a center of the pin coupling portion. ### Claim 16 (depends on 15) The scroll compressor of claim 15, wherein an outer diameter of the reinforcing portion is twice larger than or four times smaller than an inner diameter of the pin coupling portion. ### Claim 17 A scroll compressor, comprising: a casing; a fixed scroll disposed in the casing; an orbiting scroll configured to engage the fixed scroll and define a compression chamber; a scroll support member disposed at a side of the orbiting scroll in an axial direction and configured to support the orbiting scroll in the axial direction; an anti-rotation pin disposed at one of a side surface of the orbiting scroll or a side surface of the scroll support member facing the side surface of the orbiting scroll; a ring insertion groove defined at a side surface of a portion that faces the anti-rotation pin; and an anti-rotation ring including: a ring body portion inserted into the ring insertion groove and configured to rotate relative to the ring insertion groove, and a pin coupling portion disposed at the ring body portion and configured to couple the anti-rotation pin, wherein the pin coupling portion is offset from a center of the ring body portion, and wherein an axial thickness of the ring body portion is smaller than or equal to twice an axial depth of the ring insertion groove, wherein an oil separator is disposed outside the casing and configured to separate oil from refrigerant discharged from the casing, wherein an oil return pipe connects the oil separator and an inside of the casing, and wherein the oil return pipe is connected to the inside of the casing at a position that faces a portion between the orbiting scroll and the scroll support member in a radial direction, wherein an oil groove is defined at a side surface of the scroll support member facing the orbiting scroll, wherein the oil groove fluidly connects an outer circumferential surface to an inner circumferential surface of the scroll support member, and wherein the oil groove includes: a plurality of first oil grooves that extend between the outer circumferential surface and the inner circumferential surface of the scroll support member and that are spaced apart from each other along a circumferential direction of the scroll support member, and at least one second oil groove that is defined in an annular shape along the circumferential direction of the scroll support member and that is in fluid communication with the plurality of first oil grooves. ### Claim 18 (depends on 17) The scroll compressor of claim 17, wherein the pin coupling portion is defined through side surfaces of the ring body portion in the axial direction or recessed from one of the side surfaces of the ring body portion, and wherein an inner diameter of the pin coupling portion is larger than an outer diameter of the anti-rotation pin. ### Claim 19 (depends on 18) The scroll compressor of claim 18, wherein a first end of the anti-rotation pin is fixed to the scroll support member, and a second end of the anti-rotation pin is rotatably coupled to the pin coupling portion. ### Claim 20 (depends on 17) The scroll compressor of claim 17, wherein the ring body portion has a disk shape and is entirely blocked except for the pin coupling portion.