# US 11,998,152 B2 · Nozzle of cleaner and methods for controlling same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,998,152 B2 - Document ID: US11998152B2 - Status: Granted - Kind: B2 - Application number: 17/264,640 - Filed: 2019-07-18 - Published: 2021-10-14 - Granted: 2024-06-04 - Earliest claimed: 2018-07-30 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Byungryul Moon; Seungbae Jung - Web page: https://patentgrep.com/patent/US11998152B2 ## CPC - A47L 11/201: {with supply of cleaning agents} - A47L 11/4069: {Driving or transmission means for the cleaning tools} - A47L 11/2025: {the tools being disc brushes} - A47L 11/283: the tools being disc brushes - A47L 11/305: {the tools being disc brushes} - A47L 11/4011: {Regulation of the cleaning machine by electric means; Control systems and remote control systems therefor} - A47L 11/4038: {Disk shaped surface treating tools} - A47L 11/4044: {Vacuuming or pick-up tools; Squeegees} - A47L 11/408: {Means for supplying cleaning or surface treating agents} - A47L 11/4083: {Liquid supply reservoirs; Preparation of the agents, e.g. mixing devices} - A47L 11/4088: {Supply pumps; Spraying devices; Supply conduits} - 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) ## Abstract The present disclosure relates to a nozzle of a cleaner. The nozzle of a cleaner includes: a nozzle main body having a suction flow path through which air is suctioned; a first rotation cleaning unit and a second rotation cleaning unit spaced apart in a left and right direction on a lower side of the nozzle main body and including a rotation plate to which mop is attachable; a first driving device disposed on one side of a flow path extending in a front and rear direction in the suction path and including a first driving motor for driving the first rotation cleaning unit; a second driving device disposed on the other side of the flow path extending in the front and rear direction in the suction path and including a second driving motor for driving the second rotation cleaning unit. ## Claims ### Claim 1 A nozzle of a cleaner comprising: a nozzle main body having a suction flow path through which air is suctioned; a first rotation cleaning unit and a second rotation cleaning unit spaced apart in a left and right direction on a lower side of the nozzle main body, each of the first rotation cleaning unit and the second rotation cleaning unit including a rotation plate to which a mop is attachable; a first driving device disposed on one side of a flow path extending in a front and rear direction in the suction flow path and including a first driving motor for driving the first rotation cleaning unit; a second driving device disposed on the other side of the flow path extending in the front and rear direction in the suction flow path and including a second driving motor for driving the second rotation cleaning unit; a water tank detachably mounted on an upper side of the nozzle main body and configured to store water to be supplied to each of the first and second rotation cleaning units; a water supply flow path provided in the nozzle main body and communicating with the water tank so as to supply water from the water tank to each of the first and second rotation cleaning units; a first sensing unit configured to sense a rotation speed of the first driving motor; a second sensing unit configured to sense a rotation speed of the second driving motor; and a control unit configured to compare the rotation speeds of the first and second driving motors sensed by the first and second sensing units, and selectively adjust the rotational speeds of the first and second driving motors according to a comparison result. ### Claim 2 (depends on 1) The nozzle according to claim 1, wherein the control unit is configured to control an output to increase a rotation speed of a driving motor having a low rotation speed when a difference between the rotation speeds of the first and second driving motors is greater than a reference value. ### Claim 3 (depends on 1) The nozzle according to claim 1, wherein the control unit is configured to control an output to decrease a rotation speed of a driving motor having a high rotation speed when a difference between the rotation speeds of the first and second driving motors is greater than a reference value. ### Claim 4 (depends on 1) The nozzle according to claim 1, wherein the control unit is configured to maintain the rotation speeds of the first and second driving motors when a difference between the rotation speeds of the first and second driving motors is less than or equal to a reference value. ### Claim 5 (depends on 1) The nozzle according to claim 1, wherein each of the first and second sensing units comprises: first and second magnets coupled to rotation shafts of the first and second driving motors to rotate; and first and second hall sensors mounted on the control unit to face the first and second magnets and configured to count the number of rotations of the first and second magnets. ### Claim 6 (depends on 1) The nozzle according to claim 1, further comprising a direction detection sensor configured to sense a change in a traveling direction of the nozzle main body and transmit the sensed change to the control unit. ### Claim 7 (depends on 6) The nozzle according to claim 6, wherein, when the direction detection sensor senses a direction change of the nozzle main body to a left side, the control unit is configured to control an output so that the rotation speed of the first driving motor disposed on the left is less than the rotation speed of the second driving motor disposed on the right. ### Claim 8 (depends on 6) The nozzle according to claim 6, wherein, when the direction detection sensor senses a direction change of the nozzle main body to a right side, the control unit is configured to control an output so that the rotation speed of the second driving motor disposed on the right is less than the rotation speed of the first driving motor disposed on the left. ### Claim 9 (depends on 1) The nozzle according to claim 1, wherein the suction flow path comprises: a first flow path extending in the left and right direction from a front end of the nozzle main body; and a second flow path extending in the front and rear direction from a central portion of the first flow path, wherein the first and second driving devices are positioned behind the first flow path, and the second flow path is positioned between the first driving device and the second driving device. ### Claim 10 (depends on 9) The nozzle according to claim 9, wherein the water tank comprises: a first chamber positioned above the first driving motor; a second chamber positioned above the second driving motor; and a connection chamber connecting the first chamber and the second chamber in a region between the first flow path and each of the driving motors. ### Claim 11 (depends on 1) The nozzle according to claim 1, wherein the first rotation cleaning unit comprises a first rotation plate to which a mop is attachable and which has a first rotation center, wherein the second rotation cleaning unit comprises a second rotation plate to which a mop is attachable and which has a second rotation center, and wherein an axis line of the first driving motor and an axis line of the second driving motor are positioned between the first rotation center and the second rotation center. ### Claim 12 (depends on 1) The nozzle according to claim 1, wherein the nozzle main body comprises a nozzle housing in which the driving devices are accommodated, wherein the nozzle housing comprises a driving unit cover that covers each of the driving devices and is convex upward, and wherein a portion of the water tank surrounds the periphery of the driving unit cover in a state where the water tank is mounted on the nozzle main body. ### Claim 13 (depends on 1) The nozzle according to claim 1, wherein the mop is attached to a lower side of the rotation plate, and the rotation plate has a plurality of water passage holes through which water discharged from the water supply flow path passes. ### Claim 14 (depends on 1) The nozzle according to claim 1, wherein the water tank comprises: a tank body having a chamber in which water is stored and a discharge port through which water is discharged; and a valve having an opening and closing unit that opens or closes the discharge port in the tank body, wherein the nozzle main body includes a valve operating unit configured to operate the opening and closing unit while the water tank is mounted on the nozzle main body, so that the opening and closing unit opens the discharge port, and the water supply flow path is connected to the valve operating unit. ### Claim 15 (depends on 1) The nozzle according to claim 1, wherein the water supply flow path comprises: a supply tube through which water discharged from the water tank flows; a connector connected to the supply tube; a first branch tube connected to the connector and configured to supply water to the first rotation cleaning unit; and a second branch tube connected to the connector and configured to supply water to the second rotation cleaning unit. ### Claim 16 A method for controlling a nozzle of a cleaner, the cleaner including: a nozzle main body having a suction flow path through which air is suctioned; a first rotation cleaning unit and a second rotation cleaning unit spaced apart in a left and right direction on a lower side of the nozzle main body, each of the first rotation cleaning unit and the second rotation cleaning unit including a rotation plate to which a mop is attachable; a first driving device disposed on one side of a flow path extending in a front and rear direction in the suction flow path and including a first driving motor for driving the first rotation cleaning unit; a second driving device disposed on the other side of the flow path extending in the front and rear direction in the suction flow path and including a second driving motor for driving the second rotation cleaning unit; a water tank detachably mounted on an upper side of the nozzle main body and configured to store water to be supplied to each of the first and second rotation cleaning units; a water supply flow path provided in the nozzle main body and communicating with the water tank so as to supply water from the water tank to each of the first and second rotation cleaning units; a first sensing unit configured to sense a rotation speed of the first driving motor; a second sensing unit configured to sense a rotation speed of the second driving motor; and a control unit, the method comprising: turning on the first and second driving motors; detecting, by the first and second sensing units, rotation speeds of the first and second driving motors, respectively; comparing, by the control unit, the rotation speeds of the first and second driving motors; and selectively adjusting the rotation speeds of the first and second driving motors according to a comparison result. ### Claim 17 (depends on 16) The method according to claim 16, wherein, when it is determined from the comparison result that a difference between the rotation speeds of the first and second driving motors is greater than a reference value, the control unit controls an output to increase a rotation speed of a driving motor having a low rotation speed. ### Claim 18 (depends on 16) The method according to claim 16, wherein, when it is determined from the comparison result that a difference between the rotation speeds of the first and second driving motors is greater than a reference value, the control unit controls an output to decrease a rotation speed of a driving motor having a high rotation speed. ### Claim 19 (depends on 16) The method according to claim 16, further comprising: detecting, by a direction detection sensor, a change in a traveling direction of a nozzle main body; and selectively adjusting rotation speeds of the first and second driving motors according to whether the direction of the nozzle main body is changed. ### Claim 20 (depends on 19) The method according to claim 19, wherein, when a direction change of the nozzle main body to a left side is detected, the control unit controls an output so that the rotation speed of the first driving motor disposed on the left is less than the rotation speed of the second driving motor disposed on the right. ### Claim 21 (depends on 19) The method according to claim 19, wherein, when a direction change of the nozzle main body to a right side is detected, the control unit controls an output so that the rotation speed of the second driving motor disposed on the right is less than the rotation speed of the first driving motor disposed on the left.