# US 11,898,576 B2 · Centrifugal fan and air conditioning apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,898,576 B2 - Document ID: US11898576B2 - Status: Granted - Kind: B2 - Application number: 17/548,228 - Filed: 2021-12-10 - Published: 2022-03-31 - Granted: 2024-02-13 - Earliest claimed: 2020-02-29 - Assignees: Huawei Digital Power Technologies Co., Ltd.; Fans-tech Electric Co., Ltd. - Applicants: Huawei Digital Power Technologies Co., Ltd.; Fans-tech Electric Co., Ltd. - Inventors: Huanwen Huang; Hsienchou Lin; Jingyi Luo - Web page: https://patentgrep.com/patent/US11898576B2 ## CPC - F04D 29/441: {especially adapted for elastic fluid pumps} - H02K 7/14: Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06) - F04D 17/16: for displacing without appreciable compression - F04D 25/06: the pump being electrically driven (F04D25/08 takes precedence) - F04D 25/0613: {the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator} - F04D 25/08: the working fluid being air, e.g. for ventilation - F04D 29/263: {mounting fan or blower rotors on shafts} - F04D 29/281: {for fans or blowers} - F04D 29/30: Vanes - F04D 29/624: {especially adapted for elastic fluid pumps} - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract A centrifugal fan and an air conditioning apparatus are provided. The centrifugal fan includes a top plate, a baseplate, a motor, a flow guiding cover, and a plurality of blades. A motor mounting hole is disposed at a central position of the baseplate, and the motor has a motor housing. The motor housing is mounted on the motor mounting hole and is fastened to the baseplate, and the motor at least partially extends between the baseplate and top plate. The blades are fastened between the top plate and the baseplate, and the plurality of blades are disposed around the motor. The flow guiding cover is sheathed on an outer peripheral side of the motor housing, and is detachably mounted on the baseplate. ## Claims ### Claim 1 A centrifugal fan comprising: a top plate; a baseplate with a motor mounting hole; a plurality of blades disposed between the top plate and the baseplate, wherein the plurality of blades are separately fastened to the top plate and the baseplate, and the plurality of blades are disposed around the motor mounting hole; a motor with a motor housing, wherein the motor housing is mounted on the motor mounting hole and is fixedly connected to the baseplate, and the motor housing at least partially extends between the baseplate and the top plate; a flow guiding cover detachably mounted on the baseplate, wherein the flow guiding cover is sheathed on an outer peripheral side of the motor housing, and the flow guiding cover comprises at least two stacked sub flow guiding covers which are sequentially stacked along a direction away from the baseplate; and wherein a highest point of the flow guiding cover is substantially flush with a lowest point of an edge of a rounded corner at a top of the motor housing. ### Claim 2 (depends on 1) The centrifugal fan according to claim 1, wherein one end of the flow guiding cover close to the baseplate forms a smooth transition to the baseplate. ### Claim 3 (depends on 1) The centrifugal fan according to claim 1, wherein one end of the flow guiding cover away from the baseplate forms a smooth transition to the outer peripheral side of the motor housing. ### Claim 4 (depends on 1) The centrifugal fan according to claim 1, wherein a contour line of an outer surface of the flow guiding cover along an end close to the baseplate to an end away from the baseplate is a wavy line or a sinusoidal waveform. ### Claim 5 (depends on 1) The centrifugal fan according to claim 1, wherein the baseplate has a mounting boss, the motor mounting hole is located on the mounting boss, and the flow guiding cover is disposed on the mounting boss. ### Claim 6 (depends on 1) The centrifugal fan according to claim 1, wherein the baseplate is a metal baseplate, the top plate is a metal top plate, the blades are metal blades, and the flow guiding cover is a plastic flow guiding cover. ### Claim 7 (depends on 1) The centrifugal fan according to claim 1, wherein air inlet edges and air outlet edges of the blades each have a one-sided rounded corner facing a suction surface. ### Claim 8 (depends on 7) The centrifugal fan according to claim 7, wherein a radius R1 of the one-sided rounded corner and a thickness D of the blade satisfy R1=αD, and 0.5≤α≤1.5. ### Claim 9 An air conditioning apparatus comprising: a centrifugal fan, wherein the centrifugal fan comprises: a top plate; a baseplate with a motor mounting hole; a plurality of blades disposed between the top plate and the baseplate, wherein the plurality of blades are separately fastened to the top plate and the baseplate, and the plurality of blades are disposed around the motor mounting hole; a motor with a motor housing, wherein the motor housing is mounted on the motor mounting hole and is fixedly connected to the baseplate, and the motor housing at least partially extends between the baseplate and the top plate; a flow guiding cover detachably mounted on the baseplate, wherein the flow guiding cover is sheathed on an outer peripheral side of the motor housing, and the flow guiding cover comprises at least two stacked sub flow guiding covers which are sequentially stacked along a direction away from the baseplate; and wherein a highest point of the flow guiding cover is substantially flush with a lowest point of an edge of a rounded corner at a top of the motor housing. ### Claim 10 (depends on 9) The air conditioning apparatus according to claim 9, wherein one end of the flow guiding cover away from the baseplate forms a smooth transition to the outer peripheral side of the motor housing. ### Claim 11 (depends on 9) The air conditioning apparatus according to claim 9, wherein one end of the flow guiding cover close to the baseplate forms a smooth transition to the baseplate. ### Claim 12 (depends on 9) The air conditioning apparatus according to claim 9, wherein the baseplate has a mounting boss, the motor mounting hole is located on the mounting boss, and the flow guiding cover is disposed on the mounting boss. ### Claim 13 (depends on 9) The air conditioning apparatus according to claim 9, wherein the baseplate is a metal baseplate, the top plate is a metal top plate, the blades are metal blades, and the flow guiding cover is a plastic flow guiding cover. ### Claim 14 (depends on 9) The air conditioning apparatus according to claim 9, wherein air inlet edges and air outlet edges of the blades each have a one-sided rounded corner facing a suction surface. ### Claim 15 (depends on 9) The air conditioning apparatus according to claim 9, wherein a radius R1 of a one-sided rounded corner and a thickness D of the blade satisfy R1=αD, and 0.5≤α≤1.5.