# US 12,110,887 B2 · Fixed scroll and scroll compressor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,110,887 B2 - Document ID: US12110887B2 - Status: Granted - Kind: B2 - Application number: 18/006,088 - Filed: 2020-11-10 - Published: 2023-11-02 - Granted: 2024-10-08 - Earliest claimed: 2020-07-27 - Assignees: Copeland Climate Technologies (Suzhou) Co. Ltd. - Applicants: Copeland Climate Technologies (Suzhou) Co., Ltd. - Inventors: Xuan Liu; Hong Yan; Hongwei Zou; Xinxian Liu - Web page: https://patentgrep.com/patent/US12110887B2 ## CPC - F04C 18/0292: {Ports or channels located in the wrap} - F04C 18/0215: {where only one member is moving} - F04C 18/0253: {Details concerning the base} - F04C 18/0269: {Details concerning the involute wraps} - F04C 29/12: Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet - F04C 2250/101: of the inlet - F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS ## Abstract Disclosed are a fixed scroll and a scroll compressor. The fixed scroll comprises a fixed scroll end plate, a fixed scroll wrap, and a peripheral wall, wherein an air inlet is provided in the peripheral wall, the fixed scroll wrap comprises a starting end connected to the peripheral wall, an engagement position to be engaged with an orbiting scroll wrap, and a scroll section extending from the starting end to the engagement position; the fixed scroll further comprises a flow-guiding passage in fluid communication with the air inlet; the flow-guiding passage extends from the starting end and extends along at least part of the scroll section; the scroll section comprises a first side wall comprising a first section having a first center of curvature and a second section having a second center of curvature, which are respectively located on radially opposite sides of the first side wall. ## Claims ### Claim 1 A non-orbiting scroll of a scroll compressor, comprising: a non-orbiting scroll end plate; a non-orbiting scroll wrap extending from a first side surface of the non-orbiting scroll end plate; and a peripheral wall extending from the first side surface, located radially outside the non-orbiting scroll wrap and surrounding the non-orbiting scroll wrap, wherein an air inlet is provided in the peripheral wall, wherein the non-orbiting scroll wrap comprises a starting end connected to the peripheral wall and an engagement position to be engaged with a radial outermost tail end of an orbiting scroll wrap of an orbiting scroll of the scroll compressor, and the non-orbiting scroll wrap comprises a wrap section extending from the starting end to the engagement position, wherein the non-orbiting scroll further comprises a flow-guiding passage in fluid communication with the air inlet, the flow-guiding passage extends from the starting end and extends along at least a part of the wrap section, the wrap section comprises a first side wall located in the flow-guiding passage, the first side wall comprises a first section extending from the starting end and having a first curvature center and a second section extending from the first section and having a second curvature center, and the first curvature center and the second curvature center are respectively located on radially opposite sides of the first side wall; and wherein the first section extends from the starting end to ⅕ to ⅔ of a length of the first side wall, and a curvature change value of the first section is larger than a curvature change value of the second section. ### Claim 2 (depends on 1) The non-orbiting scroll according to claim 1, wherein in the flow-guiding passage, a largest curvature is defined at the starting end. ### Claim 3 (depends on 1) The non-orbiting scroll according to claim 1, wherein a distance between the peripheral wall and the non-orbiting scroll wrap at the engagement position is a first radial width Xm, the starting end is formed as a filleted corner, and a radius of curvature Rc of the filleted corner satisfies: 2 mm≤Rc≤0.4Xm. ### Claim 4 (depends on 1) The non-orbiting scroll according to claim 1, wherein along a direction from the engagement position to the starting end, a first radial thickness of a flow-guiding wrap section, defining the flow-guiding passage, of the wrap section increases progressively, and the first radial thickness is larger than or equal to a second radial thickness of the non-orbiting scroll wrap at the engagement position and is smaller than or equal to 3 times of the second radial thickness. ### Claim 5 (depends on 1) The non-orbiting scroll according to claim 1, wherein the flow-guiding passage comprises a recessed portion recessed relative to the first side surface, the recessed portion comprises a recessed bottom wall, and a recessed depth L of the recessed bottom wall relative to the first side surface satisfies: L≤0.3H, wherein H is an axial height of the non-orbiting scroll wrap. ### Claim 6 (depends on 5) The non-orbiting scroll according to claim 5, wherein the recessed depth increases toward the starting end. ### Claim 7 (depends on 5) The non-orbiting scroll according to claim 5, wherein the recessed bottom wall comprises an inclined surface, a horizontal surface, a curved surface or a combination thereof. ### Claim 8 (depends on 5) The non-orbiting scroll according to claim 5, wherein a distance between the peripheral wall and the non-orbiting scroll wrap at the engagement position is a first radial width Xm, a third radial width K of the recessed portion satisfies: 0.7Xm≤K