# US 9,518,580 B2 · Scroll type fluid machine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,518,580 B2 - Document ID: US9518580B2 - Status: Granted - Kind: B2 - Application number: 14/328,298 - Filed: 2014-07-10 - Published: 2015-06-04 - Granted: 2016-12-13 - Earliest claimed: 2013-12-04 - Assignees: Hitachi Industrial Equipment Systems Co., Ltd. - Applicants: Hitachi Industrial Equipment Systems Co., Ltd. - Inventors: Toshikazu Harashima - Web page: https://patentgrep.com/patent/US9518580B2 ## CPC - F04C 2/025: {the moving and the stationary member having co-operating elements in spiral form} - F01C 1/0215: {where only one member is moving} - F01C 1/0246: {Details concerning the involute wraps or their base, e.g. geometry} - F04C 15/0096: {Heating; Cooling (of machines or engines in general F01P)} - F04C 18/0215: {where only one member is moving} - F04C 18/0269: {Details concerning the involute wraps} - F04C 18/0284: {Details of the wrap tips} - 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 type fluid machine for improving compression efficiency while preventing contact between wrap sections of opposed scrolls, includes a first scroll member provided with a wrap section of a spiral shape on an end plate, a second scroll member disposed at a position opposed to the first scroll member and provided with a wrap section of a spiral shape on an end plate, cooling fins arranged on a back side surface of the end plate of at least one of the first scroll member and the second scroll member, and projected sections arranged on the wrap section of at least one of the first scroll member and the second scroll member, in which a difference of thicknesses in the radial direction of the wrap section at a distal end and a base end of the projected sections is changed depending on a position in a peripheral direction. ## Claims ### Claim 1 A scroll type fluid machine, comprising: a first scroll member provided with a wrap section of a spiral shape on an end plate; a second scroll member disposed at a position opposed to said first scroll member and provided with a wrap section of a spiral shape on an end plate; cooling fins arranged on a back side surface of said end plate of at least one of said first scroll member and said second scroll member; and projected sections arranged on said wrap section of at least one of said first scroll member and said second scroll member, wherein a difference between thicknesses in a radial direction of said wrap section at a distal end of the projected sections and the thickness at a base end of the projected sections is changed depending on a position of the projected section in a peripheral direction of the wrap section. ### Claim 2 (depends on 1) The scroll type fluid machine according to claim 1, wherein a difference between the thickness at a distal end of a first projected section, where a gap between the first projected section and the opposed scroll member expands at the time of thermal expansion of the first member and the second scroll member, and the thickness at a base end of the first projected section is smaller than a difference between the thickness at a distal end of a second projected section, where a gap between the second projected section and the opposed scroll member shortens at the time of thermal expansion of the first member and the second scroll member, and the thickness at a base end of the second project section. ### Claim 3 (depends on 2) The scroll type fluid machine according to claim 2, wherein, with respect to a difference of thicknesses in the radial direction of the wrap section at the distal end and the base end of the projected sections formed on an outer peripheral surface of the wrap section, that of the projected sections formed within a predetermined angle range including a direction perpendicular to a direction along which the cooling fins extend is smaller than that of the projected sections formed within a predetermined angle range including the direction along which the cooling fins extend. ### Claim 4 (depends on 3) The scroll type fluid machine according to claim 3, wherein any projected sections are not arranged on an outer peripheral surface of the wrap section within a predetermined angle range including a direction perpendicular to a direction along which the cooling fins extend. ### Claim 5 (depends on 2) The scroll type fluid machine according to claim 2, wherein, with respect to a difference of thicknesses in the radial direction of the wrap section at a distal end and a base end of the projected sections formed on an inner peripheral surface of the wrap section, that of the projected sections formed within a predetermined angle range including a direction along which the cooling fins extend is smaller than that of the projected section formed within a predetermined angle range including a direction perpendicular to a direction along which the cooling fins extend. ### Claim 6 (depends on 5) The scroll type fluid machine according to claim 5, wherein any projected sections are not arranged on an inner peripheral surface of the wrap section within a predetermined angle range including a direction along which the cooling fins extend. ### Claim 7 (depends on 1) The scroll type fluid machine according to claim 1, wherein any projected sections are not arranged in a portion where the gap between the projected section and the opposed scroll member is expanded at the time of thermal expansion of the first scroll member and the second scroll member. ### Claim 8 (depends on 1) The scroll type fluid machine according to claim 1, wherein a portion of said wrap section where a gap between the projected section and the opposing scroll member is expanded at the time of thermal expansion of the first scroll member and the second scroll member is formed into a polygon-like shape. ### Claim 9 A scroll type fluid machine, comprising: a first scroll member provided with a wrap section of a spiral shape on an end plate; a second scroll member disposed at a position opposed to the first scroll member and provided with a wrap section of a spiral shape on an end plate; cooling fins arranged on a back side surface of said end plate of at least one of said first scroll member and said second scroll member; and projected sections arranged on said wrap section of at least one of said first scroll member and said second scroll member, wherein a difference between a gap between the projected section and said opposed scroll member at a distal end of said projected sections and the gap at a base end of said projected sections is changed depending on a position of the projected section in a peripheral direction. ### Claim 10 (depends on 9) The scroll type fluid machine according to claim 9, wherein a difference between the gap at a distal end of a first projected section, where a gap between the first projected section and the opposed scroll member expands at the time of thermal expansion of the first member and the second scroll member, and the gap at a base end of the first projected section is smaller than a difference between the gap at a distal end of a second projected section, where a gap between the second projected section and the opposed scroll member shortens at the time of thermal expansion of the first member and the second scroll member, and the gap at a base end of the second projected section. ### Claim 11 (depends on 10) The scroll type fluid machine according to claim 10, wherein, with respect to a difference of the gaps between the projected section and the opposed scroll member at a distal end and a base end of the projected sections formed on an outer peripheral surface of the wrap section, that of the projected sections formed within a predetermined angle range including a direction perpendicular to a direction along which the cooling fins extend is smaller than that of the projected sections formed within a predetermined angle range including a direction along which the cooling fins extend. ### Claim 12 (depends on 11) The scroll type fluid machine according to claim 11, wherein any projected sections are not arranged on an outer peripheral surface of the wrap section within a predetermined angle range including a direction perpendicular to a direction along which the cooling fins extend. ### Claim 13 (depends on 10) The scroll type fluid machine according to claim 10, wherein, with respect to a difference of the gaps between the projected section and the opposed scroll member at a distal end and a base end of the projected sections formed on an inner peripheral surface of the wrap section, that of the projected sections formed within a predetermined angle range including a direction along which the cooling fins extend is smaller than that of the projected section formed within a predetermined angle range including a direction perpendicular to a direction along which the cooling fins extend. ### Claim 14 (depends on 13) The scroll type fluid machine according to claim 13, wherein any projected sections are not arranged on an inner peripheral surface of the wrap section with respect to a predetermined angle range including a direction along which the cooling fins extend. ### Claim 15 (depends on 9) The scroll type fluid machine according to claim 9, wherein any projecting sections are not arranged in a portion where the gap between the projected section and the opposed scroll member is expanded at the time of thermal expansion of the first scroll member and the second scroll member. ### Claim 16 (depends on 9) The scroll type fluid machine according to claim 9, wherein a portion where the gap between the projected section and the opposed scroll member is expanded at the time of thermal expansion of the first scroll member and the second scroll member is formed into a polygon-like shape.