# US 11,306,729 B2 · Axial flow impeller and air conditioner > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,306,729 B2 - Document ID: US11306729B2 - Status: Granted - Kind: B2 - Application number: 16/918,168 - Filed: 2020-07-01 - Published: 2020-10-22 - Granted: 2022-04-19 - Earliest claimed: 2018-02-07 - Assignees: Gd Midea Air-Conditioning Equipment Co., Ltd.; Midea Group Co., Ltd. - Applicants: Gd Midea Air-Conditioning Equipment Co., Ltd.; Midea Group Co., Ltd. - Inventors: Bo Wang; Xujie Cai; Hejie Zhou - Web page: https://patentgrep.com/patent/US11306729B2 ## CPC - F04D 29/384: {characterised by form} - F04D 19/002: {Axial flow fans} - F04D 29/325: {for axial flow fans (blade mountings F04D29/34, blades F04D29/38)} - F24F 1/38: Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings - F24F 1/40: Vibration or noise prevention at outdoor units (for outdoor units compressors F24F1/12) - F05B 2240/301: Cross-section characteristics - F05B 2260/232: characterised by the cooling medium - F05D 2240/301: Cross-sectional characteristics - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02) - F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS ## Abstract An axial flow impeller includes a hub and a blade at the hub. A blade edge of the blade includes a blade root edge, a front blade edge, a blade top edge, and a rear blade edge connected sequentially. The blade includes a divider strip arranged between the front blade edge and the rear blade edge and connecting the blade root edge and the blade top edge. At a same circumference, a ratio between a circumferential span from the divider to the front blade edge and a circumferential span from the front blade edge to the rear blade edge is equal to or greater than 0.2 and equal to or smaller than 0.4, a thickness of the divider strip is greater than thicknesses of other portions of the blade, and a thickness of the rear blade edge is smaller than a thickness of the front blade edge. ## Claims ### Claim 1 An axial flow impeller comprising: a hub; and a blade provided at the hub, wherein: a blade edge of the blade includes a blade root edge, a front blade edge, a blade top edge, and a rear blade edge connected sequentially; the blade includes a divider strip arranged between the front blade edge and the rear blade edge and connecting the blade root edge and the blade top edge; at a same circumference of the blade: a ratio between a circumferential span from the divider to the front blade edge and a circumferential span from the front blade edge to the rear blade edge is equal to or greater than 0.2 and equal to or smaller than 0.4, a thickness of the divider strip is greater than thicknesses of other portions of the blade, and a thickness of the rear blade edge is smaller than a thickness of the front blade edge, and a difference ΔH1 between the thickness of the divider strip H0 and the thickness of the front blade edge H1 is equal to or greater than 0.3 mm and equal to or smaller than 1.5 mm, and a difference ΔH2 between H0 and the thickness of the rear blade edge H2 is equal to or greater than 2.5 mm and equal to or smaller than 5 mm; and at a same radial direction of the blade, ΔH1 is fixed and has a constant value, or ΔH1 gradually increases as a circumferential radius of the blade increases. ### Claim 2 (depends on 1) The axial flow impeller of claim 1, wherein: the divider strip is configured to divide the blade into a front blade portion and a rear blade portion; and at the same circumference of the blade, a thickness of the front blade portion gradually decreases from the divider strip to the front blade edge, and a thickness of the rear blade portion gradually decreases from the divider strip to the rear blade edge. ### Claim 3 (depends on 1) The axial flow impeller of claim 1, wherein: at the same radial direction of the blade ΔH2 is a fixed and has a constant value; or as the circumferential radius of the blade increases, ΔH2 gradually decreases. ### Claim 4 (depends on 1) The axial flow impeller of claim 1 wherein at the same radial direction of the blade, as a circumferential radius of a circumferential section of the blade increases, ΔH1 gradually increases and ΔH2 gradually decreases. ### Claim 5 (depends on 1) The axial flow impeller of claim 1, wherein H0 is equal to or greater than 4.5 mm and equal to or smaller than 7.6 mm, H1 is equal to or greater than 3.0 mm and equal to or smaller than 7.3 mm, and H2 is equal to or greater than 1.7 mm and equal to or smaller than 2.5 mm. ### Claim 6 (depends on 1) The axial flow impeller of claim 1, wherein at the same radial direction of the blade, the thickness of the blade gradually decreases from the blade root edge to the blade top edge. ### Claim 7 (depends on 1) The axial flow impeller of claim 1, wherein an angle α formed by a blade chord line, which connects the front blade edge and the rear blade edge at the same circumference of the blade, and a rotation plane of the axial flow impeller gradually decreases in a radial direction of the blade. ### Claim 8 (depends on 7) The axial flow impeller of claim 7, wherein α is equal to or greater than 20° and equal to or smaller than 30°. ### Claim 9 (depends on 8) The axial flow impeller of claim 8, wherein α is equal to or greater than 20° and equal to or smaller than 28°. ### Claim 10 (depends on 9) The axial flow impeller of claim 9, wherein α and a radius coefficient k, which is a ratio between a circumferential radius of the blade chord line and a circumferential radius of the blade top edge, satisfy following relations: when k is equal to or greater than 0 and equal to or smaller than 0.1, α=28°−k×30°; when k is greater than 0.1 and equal to or smaller than 0.4, α=26°−k×10°; and when k is greater than 0.4 and equal to or smaller than 1, α=23.3°−k×3.3°. ### Claim 11 An air conditioner comprising: an axial flow impeller including: a hub; and a blade provided at the hub, wherein: a blade edge of the blade includes a blade root edge, a front blade edge, a blade top edge, and a rear blade edge connected sequentially; the blade includes a divider strip arranged between the front blade edge and the rear blade edge and connecting the blade root edge and the blade top edge; at a same circumference of the blade: a ratio between a circumferential span from the divider to the front blade edge and a circumferential span from the front blade edge to the rear blade edge is equal to or greater than 0.2 and equal to or smaller than 0.4, a thickness of the divider strip is greater than thicknesses of other portions of the blade, and a thickness of the rear blade edge is smaller than a thickness of the front blade edge, and a difference ΔH1 between the thickness of the divider strip H0 and the thickness of the front blade edge H1 is equal to or greater than 0.3 mm and equal to or smaller than 1.5 mm, and a difference ΔH2 between H0 and the thickness of the rear blade edge H2 is equal to or greater than 2.5 mm and equal to or smaller than 5 mm; and at a same radial direction of the blade, ΔH1 is fixed and has a constant value, or ΔH1 gradually increases as a circumferential radius of the blade increases. ### Claim 12 (depends on 11) The air conditioner of claim 11, wherein the divider strip is configured to divide the blade into a front blade portion and a rear blade portion; and at the same circumference of the blade, a thickness of the front blade portion gradually decreases from the divider strip to the front blade edge, and a thickness of the rear blade portion gradually decreases from the divider strip to the rear blade edge. ### Claim 13 (depends on 11) The air conditioner of claim 11, wherein at the same radial direction of the blade, as the circumferential radius of a circumferential section of the blade increases, ΔH1 gradually increases and ΔH2 gradually decreases. ### Claim 14 (depends on 11) The air conditioner of claim 11, wherein H0 is equal to or greater than 4.5 mm and equal to or smaller than 7.6 mm, H1 is equal to or greater than 3.0 mm and equal to or smaller than 7.3 mm, and H2 is equal to or greater than 1.7 mm and equal to or smaller than 2.5 mm. ### Claim 15 (depends on 11) The air conditioner of claim 11, wherein an angle α formed by a blade chord line, which connects the front blade edge and the rear blade edge at the same circumference of the blade, and a rotation plane of the axial flow impeller gradually decreases in a radial direction of the blade. ### Claim 16 (depends on 15) The air conditioner of claim 15, wherein α is equal to or greater than 20° and equal to or smaller than 30°. ### Claim 17 (depends on 16) The air conditioner of claim 16, wherein α and a radius coefficient k, which is a ratio between a circumferential radius of the blade chord line and a circumferential radius of the blade top edge, satisfy following relations: when k is equal to or greater than 0 and equal to or smaller than 0.1, α=28°−k×30°; when k is greater than 0.1 and equal to or smaller than 0.4, α=26°−k×10°; and when k is greater than 0.4 and equal to or smaller than 1, α=23.3°−k×3.3°. ### Claim 18 An axial flow impeller comprising: a hub; and a blade provided at the hub, wherein: a blade edge of the blade includes a blade root edge, a front blade edge, a blade top edge, and a rear blade edge connected sequentially; the blade includes a divider strip arranged between the front blade edge and the rear blade edge and connecting the blade root edge and the blade top edge; at a same circumference of the blade: a ratio between a circumferential span from the divider to the front blade edge and a circumferential span from the front blade edge to the rear blade edge is equal to or greater than 0.2 and equal to or smaller than 0.4, and a thickness of the divider strip is greater than thicknesses of other portions of the blade, and a thickness of the rear blade edge is smaller than a thickness of the front blade edge; and at a same radial direction of the blade, the thickness of the blade gradually decreases from the blade root edge to the blade top edge.