# US 2018/0320689 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 2018/0320689 A1 - Document ID: US20180320689A1 - Status: Published application - Kind: A1 - Application number: 15/963,269 - Filed: 2018-04-26 - Published: 2018-11-08 - Earliest claimed: 2017-05-08 - Assignees: Hitachi-Johnson Controls Air Conditioning, Inc. - Applicants: Hitachi-Johnson Controls Air Conditioning, Inc. - Inventors: Takeshi KONO; Eri MORITA; Yuusuke UEHASHI - Web page: https://patentgrep.com/patent/US20180320689A1 ## CPC - F04C 18/0215: {where only one member is moving} - F04C 23/008: {Hermetic pumps} - F04C 2230/603: Centering; Aligning - F04C 2240/30: Casings or housings - F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS ## Abstract A centering process and fastening bolt are not required for assembling a fixed scroll and an orbiting scroll of a scroll compressor that includes a hermetically sealed container and a compression mechanism. The fixed scroll includes a cylindrical portion formed in a circumferential direction on an outer circumferential side of the fixed wrap, a flange provided in the circumferential direction further outside of the cylindrical portion, and a first hole provided in the flange in an axial direction. The frame includes an inner circumferential surface, a flange provided in the circumferential direction further outside of the inner circumferential surface, and a second hole in the axial direction which is provided in a position of the flange opposite to the first hole. A knock pin is inserted in the first and second holes to prevent the frame and the fixed scroll from being displaced in the rotational direction. ## Claims ### Claim 1 A scroll compressor, comprising: a hermetically sealed container; and a compression mechanism unit that is disposed in the hermetically sealed container and includes a frame, a fixed scroll having a fixed wrap, and an orbiting scroll having an orbiting wrap which is engaged with the fixed wrap, and disposed between the frame and the fixed scroll, wherein the fixed scroll includes a cylindrical portion which is formed in a circumferential direction on an outer circumferential side of the fixed wrap, a flange which is provided in the circumferential direction further outside of the cylindrical portion, and a first hole which is provided in the flange in an axial direction, the frame includes an inner circumferential surface into which the cylindrical portion of the fixed scroll is inserted and fitted, a flange which is provided in the circumferential direction further outside of the inner circumferential surface, and a second hole in the axial direction which is provided in a position of the flange opposite to the first hole, and the scroll compressor further comprises: a knock pin that is inserted in the first hole and the second hole to prevent the frame and the fixed scroll from being displaced in a rotational direction; and a fixing unit that fixes the frame and the fixed scroll to the hermetically sealed container. ### Claim 2 (depends on 1) The scroll compressor according to claim 1, wherein the hermetically sealed container includes a cylindrical center shell and a lid cap that covers an open end surface of the center shell, and the fixing unit sandwiches the flange of the fixed scroll and the flange of the frame between the center shell and the lid cap to fix the frame and the fixed scroll to the hermetically sealed container. ### Claim 3 (depends on 2) The scroll compressor according to claim 2, wherein a plurality of the flanges of the fixed scroll are formed at a predetermined interval in the circumferential direction, and a plurality of the flanges of the frame are formed at a predetermined interval in the circumferential direction and disposed at positions corresponding to the flanges of the fixed scroll. ### Claim 4 (depends on 1) The scroll compressor according to claim 1, wherein at least one of an outer circumferential end of the cylindrical portion of the fixed scroll and an end of the inner circumferential surface of the frame is chamfered. ### Claim 5 (depends on 1) The scroll compressor according to claim 1, wherein a gap between the cylindrical portion of the fixed scroll and the inner circumferential surface of the frame is set to 0 to several tens of microns. ### Claim 6 (depends on 1) The scroll compressor according to claim 1, wherein the cylindrical portion of the fixed scroll is pressed and fitted into the inner circumferential surface of the frame. ### Claim 7 (depends on 1) The scroll compressor according to claim 1, wherein the first hole provided in the fixed scroll is formed in an elongated round shape and the second hole provided in the frame is formed in a circular shape, the knock pin is fixed into the second hole, the first hole provided into the elongated round shape has parallel surfaces, and a width W of the parallel surfaces is set to be equal to tens of microns larger than a diameter of the knock pin. ### Claim 8 (depends on 1) The scroll compressor according to claim 1, wherein the first hole provided in the fixed scroll is formed in a circular shape and the second hole provided in the frame is formed in an elongated round shape, the knock pin is fixed into the first hole, the second hole formed in the elongated round shape has parallel surfaces, and a width W of the parallel surfaces is set to be equal to tens of microns larger than a diameter of the knock pin. ### Claim 9 (depends on 2) The scroll compressor according to claim 2, wherein the lid cap is fixed to the center shell by welding. ### Claim 10 (depends on 9) The scroll compressor according to claim 9, wherein a portion where the lid cap is welded to the center shell is placed on the outer circumferential side of the frame and a clearance portion in which a space is provided between the outer circumferential portion of the frame and the hermetically sealed container is provided in the outer circumferential portion of the frame corresponding to the welded portion. ### Claim 11 A scroll compressor, comprising: a hermetically sealed container; and a compression mechanism unit that is disposed in the hermetically sealed container and includes a frame, a fixed scroll having a fixed wrap, and an orbiting scroll having an orbiting wrap which is engaged with the fixed wrap, and disposed between the frame and the fixed scroll, wherein the fixed scroll includes a cylindrical portion which is formed in a circumferential direction on an outer circumferential side of the fixed wrap and a flange which is provided in the circumferential direction further outside of the cylindrical portion, the frame includes an inner circumferential surface into which the cylindrical portion of the fixed scroll is inserted and fitted and a flange which is provided in the circumferential direction further outside of the inner circumferential surface, and the scroll compressor further comprises: a fixing unit that positions the fixed scroll and the frame in a rotational direction and fixes the fixed scroll and the frame; and a fixing unit that fixes at least one of the frame and the fixed scroll to the hermetically sealed container.