Blower Low Speed Mode Reduces Pebble Suction
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Solution Overview
Problem
Conventional suction blowers often suck up pebbles along with fallen leaves, and adjusting the opening area to reduce pebble suction is not stable across uses.
Innovation Solution
A blower design featuring a control board that allows for a low speed mode, reducing the motor's rotation speed and thus the suction power, to minimize pebble suction while maintaining effective leaf collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the opening area is adjusted by the opening adjusting plate to reduce pebble suction, then pebble suction is reduced, but the adjustment is not stable across uses
Solution Approach 1:
The patent changes the control parameter from mechanical opening area adjustment to electronic motor speed control. The control board adjusts the motor rotation speed to a target value lower than maximum speed, which stabilizes the suction characteristics and reliably reduces pebble suction while maintaining leaf collection effectiveness.
Solution Approach 2:
The patent replaces the mechanical opening adjusting plate system with an electronic control system. Instead of mechanically adjusting the opening area, the control board electronically controls the motor speed, eliminating the need for manual mechanical adjustment and providing more stable, repeatable suction characteristics.
2Object-affected harmful factors
If the motor rotation speed is reduced to reduce pebble suction, then pebble suction is reduced, but the suction power for leaf collection decreases
Solution Approach 1:
The patent optimizes the motor speed parameter to a specific target value that balances pebble suction reduction with leaf collection efficiency. By controlling the motor at this optimized speed rather than using maximum speed or manual opening adjustment, the system achieves both reduced pebble suction and maintained leaf collection productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The low speed mode stably reduces pebble suction while still allowing for efficient collection of fallen leaves, improving operational stability and reducing pebble pickup.
Implementation Method 1
a centrifugal fan configured to rotate about a rotation shaft with rotation of the motor... configured to guide air from a suction port to a discharge port as the centrifugal fan rotates
Data Source
AI summary
A blower may include a motor; a centrifugal fan configured to rotate with rotation of the motor; a casing configured to guide air from a suction port to a discharge port; a trigger configured to be pressed; and a control board configured to control rotation of the motor. The control board may include a normal mode and a low speed mode. In the normal mode, the control board may be configured to adjust a rotation speed of the motor in accordance with a degree by which the trigger is pressed. In the low speed mode, the control board may be configured to adjust the rotation speed of the motor to a target rotation speed, wherein the target rotation speed is lower than a maximum rotation speed of the motor that is achieved when the degree by which the trigger is pressed is a maximum degree in the normal mode.