# US 11,297,989 B2 · Cleaner > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,297,989 B2 - Document ID: US11297989B2 - Status: Granted - Kind: B2 - Application number: 16/329,036 - Filed: 2017-08-02 - Published: 2019-07-18 - Granted: 2022-04-12 - Earliest claimed: 2016-09-01 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Tae Sang Park; Hyeon Joon Oh - Web page: https://patentgrep.com/patent/US11297989B2 ## CPC - A47L 5/22: with rotary fans - A47L 9/16: Arrangement or disposition of cyclones or other devices with centrifugal action - A47L 9/1409: {Rigid filtering receptacles (dust collecting receptacles for cyclones A47L9/1683)} - A47L 9/22: Mountings for motor fan assemblies - A47L 9/2836: {characterised by the parts which are controlled} - A47L 9/2884: {Details of arrangements of batteries or their installation} - F04D 17/168: {Pumps specially adapted to produce a vacuum} - F04D 29/284: {for compressors} - F04D 29/30: Vanes - A47L 9/2805: {Parameters or conditions being sensed} - A47L 2201/00: Robotic cleaning machines, i.e. with automatic control of the travelling movement or the cleaning operation - A47L 2201/022: Recharging of batteries - F05D 2240/303: related to the leading edge of a rotor blade - F05D 2240/304: related to the trailing edge of a rotor blade - A47L: DOMESTIC WASHING OR CLEANING (brushes A46B; cleaning quantities of bottles or of other hollow articles of one kind B08B9/00; laundry D06F); SUCTION CLEANERS IN GENERAL (cleaning in general B08) - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS ## Abstract Disclosed herein is a cleaner having an improved structure configured to improve the cleaning performance. The cleaner comprises a suction unit provided inside a body. The suction unit includes an impeller configured to suction air by rotating about a shaft, and a diffuser configured to guide air discharged from the impeller. The impeller includes a hub, and a blade disposed on the hub, and provided with a leading edge disposed in an upstream side in a direction in which air introduced into the suction unit flows, and a trailing edge disposed in a downstream side in the direction in which the air introduced into the suction unit flows. The leading edge of the blade forms an inclination of 60 degrees or more and 80 degrees or less with respect to an axial direction. ## Claims ### Claim 1 A cleaner comprising: a suction unit provided inside a body, wherein the suction unit comprises an impeller configured to suction air by rotating about a shaft; and a diffuser configured to guide air discharged from the impeller, wherein the impeller comprises a hub; and a blade disposed on the hub, and provided with a leading edge disposed in an upstream side in a direction in which air introduced into the suction unit flows and a trailing edge disposed in a downstream side in the direction in which the air introduced into the suction unit flows, wherein the leading edge of the blade forms an inclination of 60 degrees or more and 80 degrees or less with respect to an axial direction, and wherein the diffuser comprises a first diffuser on which the impeller is seated, and a second diffuser coupled to the first diffuser in the axial direction-. ### Claim 2 (depends on 1) The cleaner according to claim 1, wherein the diffuser further comprises an inner casing, an outer casing arranged along an outer circumference of the inner casing to be spaced apart from the inner casing, and a vane disposed between the inner casing and the outer casing to form a flow path in which air discharged from the impeller flows. ### Claim 3 (depends on 2) The cleaner according to claim 2, wherein the vane has an airfoil shaped cross-section in the axial direction. ### Claim 4 (depends on 2) The cleaner according to claim 2, wherein one end of the vane disposed in an upstream side of the flow path is disposed at a lower position in the axial direction than at least one of an upper end of the inner casing and an upper end of the outer casing disposed in the upstream side of the flow path. ### Claim 5 (depends on 2) The cleaner according to claim 2, wherein the trailing edge comprises a first end coupled to the hub, and a second end disposed on the opposite side of the first end, and wherein a distance (R1) between the shaft and the first end is less than a distance (R2) between the shaft and the second end. ### Claim 6 (depends on 5) The cleaner according to claim 5, wherein the inner casing comprises an outer circumferential surface facing the outer casing, and wherein a distance (R3) between the shaft and the outer circumferential surface of the inner casing is greater than the distance R2 between the shaft and the second end. ### Claim 7 (depends on 1) The cleaner according to claim 1, wherein the suction unit further comprises a driving source connected to the shaft to provide a driving force to allow the impeller to rotate, and wherein the driving source comprises a permanent magnet direct current (PMDC) motor. ### Claim 8 (depends on 1) The cleaner according to claim 1, wherein the suction unit further comprises a cover provided with an air inlet, and coupled to the second diffuser to accommodate the impeller and the first diffuser therein. ### Claim 9 A cleaner comprising: a suction unit provided inside a body, wherein the suction unit comprises an impeller configured to suction air by rotating about a shaft; and a diffuser configured to guide air discharged from the impeller, wherein the impeller comprises a hub; and a blade disposed on the hub, and provided with a trailing edge disposed in a downstream side in a direction in which the air introduced into the suction unit flows, the trailing edge having a first end coupled to the hub and a second end disposed on the opposite side of the first end, wherein a distance (R1) between the shaft and the first end is less than a distance (R2) between the shaft and the second end, and wherein the diffuser comprises a first diffuser on which the impeller is seated, and a second diffuser coupled to the first diffuser in the axial direction. ### Claim 10 (depends on 9) The cleaner according to claim 9, wherein the diffuser further comprises an inner casing, an outer casing arranged along an outer circumference of the inner casing to be spaced apart from the inner casing, and a vane disposed between the inner casing and the outer casing to form a flow path in which air discharged from the impeller flows. ### Claim 11 (depends on 10) The cleaner according to claim 10, wherein the inner casing comprises an outer circumferential surface facing the outer casing, and wherein a distance (R3) between the shaft and the outer circumferential surface of the inner casing is greater than the distance R2 between the shaft and the second end. ### Claim 12 (depends on 10) The cleaner according to claim 10, wherein the vane has an airfoil shaped cross-section in an axial direction. ### Claim 13 (depends on 9) The cleaner according to claim 9, wherein the leading edge of the blade forms an inclination of 60 degrees or more and 80 degrees or less with respect to an axial direction. ### Claim 14 (depends on 9) The cleaner according to claim 9, wherein the suction unit further comprises a driving source connected to the shaft to provide a driving force to allow the impeller to rotate, and wherein the driving source comprises a permanent magnet direct current (PMDC) motor.