# US 2018/0023570 A1 · Scroll compressor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0023570 A1 - Document ID: US20180023570A1 - Status: Published application - Kind: A1 - Application number: 15/548,302 - Filed: 2016-01-29 - Published: 2018-01-25 - Earliest claimed: 2015-02-04 - Assignees: Emerson Climate Technologies (Suzhou) Co., Ltd. - Applicants: Emerson Climate Technologies (Suzhou) Co., Ltd. - Inventors: Youling HUANG; Chun YANG; Dang ZENG - Web page: https://patentgrep.com/patent/US20180023570A1 ## CPC - F04C 27/003: {of resilient material} - F01C 17/066: {with an intermediate piece sliding along perpendicular axes, e.g. Oldham coupling} - F01C 19/005: {Structure and composition of sealing elements such as sealing strips, sealing rings and the like; Coating of these elements (vane construction F01C21/0809; piston rings and ring sealings of similar construction in general F16J9/00)} - F04C 18/0215: {where only one member is moving} - F04C 18/0253: {Details concerning the base} - F04C 27/005: {Axial sealings for working fluid} - F04C 18/0269: {Details concerning the involute wraps} - F04C 2240/50: Bearings - 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 provided, comprising: a compression mechanism comprising a non-orbiting scroll member and an orbiting scroll member, wherein the orbiting scroll member is axially displaceable between an engagement position and a disengagement position; a main bearing housing adapted to support the compression mechanism; a back pressure chamber formed between the orbiting scroll member and the main bearing housing, wherein the back pressure chamber is in communication with at least one of the compression chambers via a communication passage provided in the orbiting scroll member or the non-orbiting scroll member and is adapted to apply a back pressure to the orbiting scroll member to bias the orbiting scroll member toward the engagement position; and a first sealing means provided between the back pressure chamber and a suction zone of the compression mechanism and capable of maintaining sealing when the orbiting scroll member is axially displaced. ## Claims ### Claim 1 A scroll compressor, comprising: a compression mechanism comprising a non-orbiting scroll member and an orbiting scroll member, wherein the orbiting scroll member is axially displaceable between an engagement position, in which the orbiting scroll member and the non-orbiting scroll member are axially engaged with each other to form a series of compression chambers for compressing fluid, and a disengagement position, in which the orbiting scroll member is axially separated from the non-orbiting scroll member; a main bearing housing adapted to support the compression mechanism; a back pressure chamber formed between the orbiting scroll member and the main bearing housing, wherein the back pressure chamber is in communication with at least one of the compression chambers via a communication passage provided in the orbiting scroll member or the non-orbiting scroll member and is adapted to apply a back pressure to the orbiting scroll member to bias the orbiting scroll member toward the engagement position; and a first sealing means provided between the back pressure chamber and a suction zone of the compression mechanism and capable of maintaining sealing when the orbiting scroll member is axially displaced. ### Claim 2 (depends on 1) The scroll compressor according to claim 1, wherein the first sealing means is arranged in a first circumferential groove located in one of the orbiting scroll member and the non-orbiting scroll member and abuts against the other of the orbiting scroll member and the non-orbiting scroll member. ### Claim 3 (depends on 1) The scroll compressor according to claim 1, wherein the first sealing means is arranged in a first circumferential groove located in one of the orbiting scroll member and the main bearing housing and abuts against the other of the orbiting scroll member and the main bearing housing. ### Claim 4 (depends on 2) The scroll compressor according to claim 2, wherein the first sealing means comprises a first sealing member arranged in the first circumferential groove. ### Claim 5 (depends on 4) The scroll compressor according to claim 4, wherein the first sealing means further comprises a first elastic element located between the first sealing member and the first circumferential groove and the first elastic element applies a biasing force to the first sealing member. ### Claim 6 (depends on 4) The scroll compressor according to claim 4, wherein a radial dimension of the first sealing member is smaller than a radial dimension of the first circumferential groove. ### Claim 7 (depends on 4) The scroll compressor according to claim 4, wherein the first sealing means further comprises a first passage, and the first passage introduces a pressure higher than a suction pressure of the compression mechanism into the first circumferential groove, so as to apply a biasing force to a bottom surface of the first sealing member. ### Claim 8 (depends on 7) The scroll compressor according to claim 7, wherein the scroll compressor is a high side compressor, and the first passage introduces the pressure in the back pressure zone or the pressure in an external environment of the compression mechanism into the first circumferential groove. ### Claim 9 (depends on 7) The scroll compressor according to claim 7, wherein the scroll compressor is a low side compressor, and the first passage introduces a pressure in the back pressure zone into the first circumferential groove. ### Claim 10 (depends on 1) The scroll compressor according to claim 1, wherein the scroll compressor further comprises a second sealing means, wherein the second sealing means is arranged in a second circumferential groove located in one of an axial end face of a hub of the orbiting scroll member and the main bearing housing and abuts against the other of the axial end face and the main bearing housing, and the second sealing means is capable of maintaining sealing when the orbiting scroll member is axially displaced. ### Claim 11 (depends on 10) The scroll compressor according to claim 10, wherein the second sealing means comprises a second sealing member arranged in the second circumferential groove and a second elastic element located between the second sealing member and the second circumferential groove, and the second elastic element applies a biasing force to the second sealing member. ### Claim 12 (depends on 1) The scroll compressor according to claim 1, wherein scroll vanes of the orbiting scroll member and the non-orbiting scroll member are in the form of a twin scroll. ### Claim 13 (depends on 3) The scroll compressor according to claim 3, wherein the first sealing means comprises a first sealing member arranged in the first circumferential groove. ### Claim 14 (depends on 13) The scroll compressor according to claim 13, wherein the first sealing means further comprises a first elastic element located between the first sealing member and the first circumferential groove and the first elastic element applies a biasing force to the first sealing member. ### Claim 15 (depends on 13) The scroll compressor according to claim 13, wherein a radial dimension of the first sealing member is smaller than a radial dimension of the first circumferential groove. ### Claim 16 (depends on 13) The scroll compressor according to claim 13, wherein the first sealing means further comprises a first passage, and the first passage introduces a pressure higher than a suction pressure of the compression mechanism into the first circumferential groove, so as to apply a biasing force to a bottom surface of the first sealing member. ### Claim 17 (depends on 16) The scroll compressor according to claim 16, wherein the scroll compressor is a high pressure side compressor, and the first passage introduces the pressure in the back pressure zone or the pressure in an external environment of the compression mechanism into the first circumferential groove. ### Claim 18 (depends on 16) The scroll compressor according to claim 16, wherein the scroll compressor is a low pressure side compressor, and the first passage introduces a pressure in the back pressure zone into the first circumferential groove.