# US 2021/0084792 A1 · Centrifugal fan > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0084792 A1 - Document ID: US20210084792A1 - Status: Published application - Kind: A1 - Application number: 16/694,953 - Filed: 2019-11-25 - Published: 2021-03-18 - Earliest claimed: 2019-09-12 - Assignees: Inventec (Pudong) Technology Corporation; Inventec Corporation - Applicants: Inventec (Pudong) Technology Corporation; Inventec Corporation - Inventors: Shin-Hsin HSIEN; Chih-Kai YANG - Web page: https://patentgrep.com/patent/US20210084792A1 ## CPC - H05K 7/20136: {Forced ventilation, e.g. by fans (H05K7/202 takes precedence)} - F04D 17/16: for displacing without appreciable compression - F04D 25/0613: {the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator} - F04D 25/064: {Details of the rotor} - F04D 25/0693: {Details or arrangements of the wiring} - F04D 29/083: {especially adapted for elastic fluid pumps} - F04D 29/4226: {Fan casings} - F28D 15/0233: {the conduits having a particular shape, e.g. non-circular cross-section, annular (F28D15/0241, F28D15/0266 take precedence)} - F28D 15/0275: {Arrangements for coupling heat-pipes together or with other structures, e.g. with base blocks; Heat pipe cores} - H10W 40/43: by flowing gases, e.g. forced air cooling - F28F 3/025: {the means being corrugated, plate-like elements} - G06F 1/203: {for portable computers, e.g. for laptops} - H10W 40/226: {characterised by projecting parts, e.g. fins to increase surface area (leadframes for cooling H10W70/461)} - H10W 40/73: for cooling by change of state - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general) - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 - F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A centrifugal fan including an impeller housing and an impeller. The impeller housing has an accommodation space, an air inlet and an air outlet. The air inlet and the air outlet are connected to the accommodation space. The impeller is located in the accommodation space. The impeller includes a hub, a plurality of blades, and at least one heat conductive annular portion. The hub is rotatably disposed in the impeller housing. The plurality of blades are connected to an outer circumferential surface of the hub. The at least one heat conductive annular portion is connected to the plurality of blades. ## Claims ### Claim 1 A centrifugal fan, comprising: an impeller housing, having an accommodation space, an air inlet and an air outlet, wherein the air inlet and the air outlet are connected to the accommodation space; and an impeller, located in the accommodation space, the impeller comprising a hub, a plurality of blades, and at least one heat conductive annular portion, wherein the hub is rotatably disposed in the impeller housing, the plurality of blades are connected to an outer circumferential surface of the hub, and the at least one heat conductive annular portion is connected to the plurality of blades. ### Claim 2 (depends on 1) The centrifugal fan according to claim 1, wherein the at least one heat conductive annular portion is connected to sides of the plurality of blades that are located away from the air inlet. ### Claim 3 (depends on 2) The centrifugal fan according to claim 2, wherein a quantity of the at least one heat conductive annular portion is plural. ### Claim 4 (depends on 3) The centrifugal fan according to claim 3, wherein the impeller further comprises a heat dissipation annular plate, and the heat dissipation annular plate is connected to sides of the plurality of heat conductive annular portions that are located adjacent to the air inlet. ### Claim 5 (depends on 4) The centrifugal fan according to claim 4, wherein the impeller further comprises a muffle ring, and the muffle ring is connected to sides of the plurality of blades that are located adjacent to the air inlet. ### Claim 6 (depends on 1) The centrifugal fan according to claim 1, wherein the muffle ring is connected to sides of the plurality of blades that are located away from the hub. ### Claim 7 (depends on 1) The centrifugal fan according to claim 1, wherein the impeller further comprises a muffle ring, and the muffle ring is connected to sides of the plurality of blades that are located adjacent to the air inlet. ### Claim 8 (depends on 1) The centrifugal fan according to claim 1, wherein the muffle ring is connected to sides of the plurality of blades that are located away from the hub. ### Claim 9 (depends on 1) The centrifugal fan according to claim 1, wherein each of the plurality of blades has a recess located away from the air outlet, and the at least one heat conductive annular portion is located in the recess. ### Claim 10 (depends on 1) The centrifugal fan according to claim 1, wherein the impeller housing comprises a bottom plate and a cover plate, the cover plate is disposed on the bottom plate so that the cover plate and the bottom plate together form the accommodation space, and the impeller is rotatably disposed on the bottom plate.