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US 11,962,257 B2Granted
Technique for suppressing decrease in flow rate of air discharged from blower
AssigneeMakita Corporation
InventorsYuki Kawai, Naoya Asami
Life of this patent
Estimating the term…
Abstract
A blower in one aspect of the present disclosure includes: a housing including a first discharge port; a motor in the housing; a fan in the housing; an attachment fitting portion; and a motor drive circuit. The attachment fitting portion is configured to detachably attach, to the first discharge port, an attachment including a second discharge port. The motor drive circuit (i) delivers a designated power to the motor and (ii) performs a constant power control that maintains a magnitude of an electric power delivered to the motor at a magnitude of the designated power.
Claims20
A handheld blower comprising:
- a housing including a suction port;
- a first discharge port;
- and an attachment fitting portion, the suction port and the first discharge port communicating an inside of the housing with an outside of the housing, the first discharge port having an opening area of a first magnitude, the attachment fitting portion being configured to detachably attach an attachment to the first discharge port, the attachment (i) being in the form of a nozzle, (ii) including a second discharge port, and (iii) being configured to receive an airflow discharged through the first discharge port and to discharge the airflow through the second discharge port, the second discharge port having an opening area of a second magnitude, and the second magnitude being smaller than the first magnitude;
- a motor in the housing;
- a fan (i) in the housing and (ii) configured to be rotationally driven by the motor to thereby generate the airflow to be discharged through the first discharge port;
- a trigger configured to be pulled by a user of the blower;
- a control circuit programmed to:
- set an output duty ratio based on a trigger level, wherein the trigger level corresponds to a pulled distance of the trigger;
- and
- output a power designating signal having the output duty ratio;
- and
- a motor drive circuit configured to:
- receive the power designating signal;
- deliver, to the motor, an electric power having a magnitude in accordance with the output duty ratio of the power designating signal received;
- and
- perform a constant power control that maintains the magnitude of the electric power delivered to the motor at a magnitude corresponding to the output duty ratio.
13 more elements
A blower comprising:
- a housing including a suction port and a first discharge port, the suction port and the first discharge port communicating an inside of the housing with an outside of the housing;
- a motor in the housing;
- a fan (i) in the housing and (ii) configured to be rotationally driven by the motor to thereby generate an airflow from the suction port to the first discharge port;
- an attachment fitting portion configured to detachably attach an attachment to the first discharge port, the attachment (i) including a second discharge port and (ii) configured to receive the airflow discharged through the first discharge port and to discharge the airflow through the second discharge port;
- and
- a motor drive circuit configured (i) to deliver a designated power to the motor and (ii) to perform a constant power control that maintains a magnitude of an electric power delivered to the motor at a magnitude of the designated power.
3 more elements
A method for operating a blower, comprising:
- attaching an attachment to a first discharge port of the blower, the attachment (i) including a second discharge port and (ii) configured to receive an airflow discharged through the first discharge port and to discharge the airflow through the second discharge port;
- delivering, to a motor of the blower, an electrical power having a magnitude designated by a user of the blower, the motor being configured to rotationally drive a fan of the blower;
- and
- performing a constant power control that maintains a magnitude of the electric power delivered to the motor at the magnitude designated by the user.
1 more element
Dependencies are inferred from the claim text.