# US 10,371,161 B2 · Impeller and centrifugal fan with same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,371,161 B2 - Document ID: US10371161B2 - Status: Granted - Kind: B2 - Application number: 15/346,405 - Filed: 2016-11-08 - Published: 2017-10-19 - Granted: 2019-08-06 - Earliest claimed: 2016-04-15 - Assignees: Delta Electronics, Inc. - Applicants: Delta Electronics, Inc. - Inventors: Wei-I Ling; Chih-Chung Chen; Meng-Yu Chen - Web page: https://patentgrep.com/patent/US10371161B2 ## CPC - F04D 29/281: {for fans or blowers} - F04D 17/16: for displacing without appreciable compression - F04D 29/30: Vanes - F04D 29/4226: {Fan casings} - F04D 29/666: {by means of rotor construction or layout, e.g. unequal distribution of blades or vanes} - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) ## Abstract A centrifugal fan includes a frame and an impeller. The impeller is disposed within the frame. The impeller includes a hub, a first blade group and a second blade group. The hub includes a center part, an inclined part and a connection part. The first blade group is connected with the connection part of the hub. The second blade group is disposed on the inclined part of the hub. There is a first distance between the second blade group and the first blade group. There is a second distance between the second blade group and the center part of the hub. ## Claims ### Claim 1 An impeller, comprising: a hub comprising a center part, an inclined part and a connection part; a first blade group connected with the connection part of the hub; and a second blade group disposed on the inclined part of the hub, wherein the second blade group is integrally formed with the hub, the second blade group is protruded upwardly from the inclined part of the hub, there is a first distance between the second blade group and the first blade group, and there is a second distance between the second blade group and the center part of the hub. ### Claim 2 (depends on 1) The impeller according to claim 1, wherein the inclined part is arranged between the center part and the connection part, and the inclined part has an incline that is extended downwardly from the center part to the connection part, and an end of the inclined part is connected with the connection part. ### Claim 3 (depends on 1) The impeller according to claim 1, wherein the first distance is in a range between 3 mm and 4 mm, and the second distance is in a range between 3 mm and 4 mm. ### Claim 4 (depends on 1) The impeller according to claim 1, wherein the first distance is equal to the second distance, and both of the first distance and the second distance are 3.5 mm. ### Claim 5 An impeller, comprising: a hub comprising a center part, an inclined part and a connection part; a first blade group connected with the connection part of the hub, wherein the first blade group comprises plural forwardly-inclined blades, and a second blade group disposed on the inclined part of the hub, wherein the second blade group comprises plural backwardly-inclined blades, there is a first distance between the second blade group and the first blade group, and there is a second distance between the second blade group and the center part of the hub. ### Claim 6 (depends on 5) The impeller according to claim 5, wherein a blade density of the plural forwardly-inclined blades of the first blade group is larger than a blade density of the plural backwardly-inclined blade of the second blade group. ### Claim 7 (depends on 6) The impeller according to claim 6, wherein a gap between every two adjacent forwardly-inclined blades of the first blade group is in a range between 8 mm and 12 mm, and a gap between every two adjacent backwardly-inclined blades of the second blade group is in a range between 22 mm and 26 mm. ### Claim 8 (depends on 7) The impeller according to claim 7, wherein the gap between every two adjacent forwardly-inclined blades of the first blade group is 10 mm, and the gap between every two adjacent backwardly-inclined blades of the second blade group is 24 mm. ### Claim 9 (depends on 5) The impeller according to claim 5, wherein a height of the second blade group is smaller than a height of the first blade group. ### Claim 10 (depends on 9) The impeller according to claim 9, wherein the height of the first blade group is in a range between 13 mm and 14 mm, and the height of the second blade group is in a range between 11 mm and 12 mm. ### Claim 11 (depends on 10) The impeller according to claim 10, wherein the height of the first blade group is 13.4 mm, and the height of the second blade group is 11.4 mm. ### Claim 12 (depends on 9) The impeller according to claim 9, wherein there is a height difference between the first blade group and the second blade group, and the height difference is in a range between 1 mm and 3 mm. ### Claim 13 (depends on 12) The impeller according to claim 12, wherein the height difference is 2 mm. ### Claim 14 A centrifugal fan, comprising: a frame; and an impeller disposed within the frame, wherein the impeller comprises: a hub comprising a center part, an inclined part and a connection part; a first blade group connected with the connection part of the hub; and a second blade group disposed on the inclined part of the hub, wherein the second blade group is integrally formed with the hub, and the second blade group is protruded upwardly from the inclined part of the hub, there is a first distance between the second blade group and the first blade group, and there is a second distance between the second blade group and the center part of the hub. ### Claim 15 A centrifugal fan, comprising: a frame, and an impeller disposed within the frame, wherein the impeller comprises: a hub comprising a center part, an inclined part and a connection part, a first blade group connected with the connection part of the hub, wherein the first blade group comprises plural forwardly-inclined blades; and a second blade group disposed on the inclined part of the hub, wherein there is a first distance between the second blade group and the first blade group, there is a second distance between the second blade group and the center part of the hub, the second blade group comprises plural backwardly-inclined blades, wherein a blade density of the plural forwardly-inclined blades of the first blade group is larger than a blade density of the plural backwardly-inclined blade of the second blade group. ### Claim 16 (depends on 15) The centrifugal fan according to claim 15, wherein a height of the second blade group is smaller than a height of the first blade group.