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JP-7857459-B2 - Suction nozzle and vacuum cleaner

JP7857459B2JP 7857459 B2JP7857459 B2JP 7857459B2JP-7857459-B2

Inventors

  • 鹿山 俊洋

Assignees

  • 美的集団股▲フン▼有限公司

Dates

Publication Date
20260512
Application Date
20250221

Claims (10)

  1. Multiple rotating cleaning bodies having parallel rotational centerlines, Multiple electric motors that generate rotational driving force for the multiple rotating cleaning bodies, A current detection circuit for individually detecting the current flowing through each of the aforementioned electric motors, The system comprises a control unit that controls the operation of the plurality of electric motors, The control unit, Based on the detection result of the current detection circuit, it is determined which direction the plurality of rotating cleaning bodies are moving in that intersects the rotation centerline. At least one of the electric motors is operated so that the rotating cleaning body, which is ahead in the direction of travel, rotates in a forward rotation direction that assists its movement. The other at least one electric motor is operated so that at least one of the rotating cleaning bodies follows the preceding rotating cleaning body and rotates in the opposite direction. The multiple electric motors are operated such that the auxiliary force generated by the forward-rotating cleaning body in the direction of travel is greater than the resistance force generated by the reverse-rotating cleaning body in the opposite direction of travel. Based on the interval at which peak currents occur in which the current flowing through at least one of the aforementioned multiple electric motors exceeds a predetermined determination current, the time interval at which the multiple rotating cleaning bodies move in a direction intersecting the rotation centerline is estimated. If the estimated time interval is shorter than a predetermined time interval, the difference between the auxiliary force and the resistive force is set as the first difference. If the estimated time interval is greater than or equal to a predetermined time interval, the suction port body sets the difference between the auxiliary force and the resistive force to a second difference that is greater than the first difference.
  2. The suction port according to claim 1, wherein the control unit detects a change in the direction of travel based on the current value flowing through the electric motor that rotates at least one of the forward-rotating cleaning bodies, or a change in the current value flowing through the electric motor that rotates at least one of the forward-rotating cleaning bodies, and determines which direction the plurality of rotating cleaning bodies are moving in that intersects the rotational centerline.
  3. The system includes an acceleration sensor that detects acceleration in a direction intersecting the rotational centerline of the plurality of rotating cleaning bodies, The suction port body according to claim 1 or 2, wherein the determination of the direction of travel based on the detection result of the current detection circuit is initiated when the direction of acceleration is reversed.
  4. The control unit estimates the rolling resistance due to friction of the surface to be cleaned in contact with the rotating cleaning body, which is rotationally driven by the electric motor, based on the current value flowing through at least one of the plurality of electric motors, the change in the current value, or the magnitude of the peak current in which the current value exceeds a predetermined determination current. The suction port body according to any one of claims 1 to 3, wherein if the estimated rolling resistance is greater than a predetermined rolling resistance, a first drive power is sent to the plurality of motors, and if the estimated rolling resistance is less than or equal to the predetermined rolling resistance, a second drive power less than the first drive power is sent to the plurality of motors.
  5. The suction port body according to any one of claims 1 to 4, wherein the magnitude of the resistance force that generates the first difference is greater than the resistance force that generates the second difference.
  6. The suction port body according to any one of claims 1 to 5, wherein the magnitude of the resistance force that generates the second difference is smaller than the resistance force that generates the first difference.
  7. A main body that rotatably supports the plurality of rotating cleaning bodies, The suction port body according to any one of claims 1 to 6, further comprising a resistance reduction mechanism that protrudes from the bottom surface of the main body to move the main body away from the surface to be cleaned and reduce the rolling resistance of the plurality of rotating cleaning bodies when the plurality of rotating cleaning bodies move in a direction parallel to the rotation center line.
  8. The device includes a joint that receives a force to advance the plurality of rotating cleaning bodies while applying load to the surface to be cleaned, and a force to retract the plurality of rotating cleaning bodies while removing the load from the surface to be cleaned, The suction port according to any one of claims 1 to 7, wherein the control unit operates the multiple electric motors so as to increase the difference between the auxiliary force and the resistance force immediately after determining that the direction of travel of the multiple rotating cleaning bodies has switched from backward to forward.
  9. The vacuum cleaner body and An electric blower housed in the vacuum cleaner body that generates negative pressure, A vacuum cleaner comprising a suction port body according to any one of claims 1 to 8 , which is fluidly connected to the electric blower.
  10. Multiple rotating cleaning bodies having parallel rotational centerlines, Multiple electric motors that generate rotational driving force for the multiple rotating cleaning bodies, A current detection circuit for individually detecting the current flowing through each of the aforementioned electric motors, The system comprises a control unit that controls the operation of the plurality of electric motors, The control unit, Based on the detection result of the current detection circuit, it is determined which direction the plurality of rotating cleaning bodies are moving in that intersects the rotation centerline. At least one of the electric motors is operated so that the rotating cleaning body, which is ahead in the direction of travel, rotates in a forward rotation direction that assists its movement. The other at least one electric motor is operated so that at least one of the rotating cleaning bodies follows the preceding rotating cleaning body and rotates in the opposite direction. The multiple electric motors are operated such that the auxiliary force generated by the forward-rotating cleaning body in the direction of travel is greater than the resistance force generated by the reverse-rotating cleaning body in the opposite direction of travel. Based on the interval at which peak currents occur in which the current flowing through at least one of the aforementioned multiple electric motors exceeds a predetermined determination current, the time interval at which the multiple rotating cleaning bodies move in a direction intersecting the rotation centerline is estimated. If the estimated time interval is shorter than a predetermined time interval, the difference between the auxiliary force and the resistive force is set as the first difference. If the estimated time interval is greater than or equal to a predetermined time interval, the vacuum cleaner sets the difference between the auxiliary force and the resistive force to a second difference that is greater than the first difference.

Description

Embodiments of the present invention relate to a suction port and a vacuum cleaner. A suction port body is known that comprises two rotating brushes and two electric motors that independently drive each of the two rotating brushes. The two rotating brushes are positioned front to back of the suction port, each having a rotational centerline extending in the width direction of the suction port. The two rotating brushes sandwich the suction port between them. When the suction port moves in the front-to-back direction, the leading rotating brush rotates to assist the movement of the suction port, sweeping dust from the surface being cleaned towards the rear and guiding it to the suction port. The trailing rotating brush rotates to create resistance to the movement of the suction port, sweeping dust from the surface being cleaned towards the front and guiding it to the suction port. For the sake of clarity in the following explanation, the rotation of the brushes that assist the movement of the suction port in the lead-up direction will be referred to as "leading forward rotation," and the rotation of the brushes that create resistance to the movement of the suction port in the trailing direction will be referred to as "trailing reverse rotation." Japanese Patent Publication No. 2021-94278 A perspective view of a vacuum cleaner according to an embodiment of the present invention.A perspective view showing the suction port body from the front right according to an embodiment of the present invention.A plan view of a suction port body according to an embodiment of the present invention.A plan view of a suction port body according to an embodiment of the present invention.A bottom view of a suction port body according to an embodiment of the present invention.A perspective view of the suction port body according to an embodiment of the present invention, viewed from below.A longitudinal cross-sectional view of a suction port body according to an embodiment of the present invention.A longitudinal cross-sectional view of a suction port body according to an embodiment of the present invention.A partial cross-sectional view of an inlet body according to an embodiment of the present invention.A partial cross-sectional view of another example of a suction port body according to an embodiment of the present invention.A control block diagram of a suction port body according to an embodiment of the present invention.A graph showing an example of the current flowing through the leading drive motor and trailing drive motor of the suction port body according to an embodiment of the present invention. Embodiments of the suction port and vacuum cleaner according to the present invention will be described with reference to Figures 1 to 12. Figure 1 is a perspective view of a vacuum cleaner according to an embodiment of the present invention. As shown in Figure 1, the electric vacuum cleaner 1 according to this embodiment is, for example, a stick type. The electric vacuum cleaner 1 comprises a vacuum cleaner body 12 having a handle 11 for handheld operation, a secondary battery 13 detachable from the vacuum cleaner body 12, an extension tube 15 connected to the vacuum cleaner body 12, and a suction port 16 connected to the extension tube 15. Furthermore, the vacuum cleaner 1 may be a canister type, an upright type, or a handheld type. The vacuum cleaner 1 may be a cordless type powered by a secondary battery 13, or it may be a wired type powered by a commercial AC power source via a power cord. The vacuum cleaner body 12 comprises a main body case 17 having a handle 11, an electric blower 18 housed in the main body case 17 that generates suction negative pressure, a dust separation and collection unit 19 detachably mounted on the main body case 17, and a main body control unit 21 that primarily controls the electric blower 18. The vacuum cleaner body 12 drives the electric blower 18 using the power stored in the secondary battery 13. The negative pressure generated by the operation of the electric blower 18 acts on the suction port 16 via the dust separation and collection unit 19 and the extension pipe 15. The electric vacuum cleaner 1 draws in dust-containing air (hereinafter referred to as "dust-containing air") from the floor surface through the suction port 16 and the extension pipe 15, separates the dust from the dust-containing air, collects and stores the separated dust, and exhausts the separated air. The main body case 17 comprises a cylindrical front section 17a positioned on the extension line of the extension pipe 15 in a side view, and a rear section 17b that bends from the front section 17a and gradually moves away from the extension line of the extension pipe 15. A dust separation and collection section 19 is provided above the front section 17a of the main body case 17. The rear section 17b of the main body case 17 extends towards the rear in the operating state (Figure 2) with the suction port 16 positioned on t