Handheld Blower Air Passage Layout for Higher Airflow and Cooling
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Solution Overview
Problem
Current handheld garden blowers face issues with limited application scope due to external power supply requirements, increased weight and fatigue from large battery packs, inflexible operation, and reduced blowing efficiency due to wire exposure and air resistance.
Innovation Solution
A handheld blower design featuring a housing with an air inlet and duct assembly, a large capacity battery, and an axial fan with a specific air passage configuration that enhances airflow efficiency, reduces air resistance, and allows one-handed operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a large capacity battery pack is used to ensure sufficient usage capacity, then the working time and air flow rate are improved, but the weight of the handheld blower is increased and handling comfort is decreased
Solution Approach 1:
The battery pack is divided into multiple individual battery cells (e.g., five 18650 battery cells) rather than using a single large battery. This segmentation allows the system to achieve the required capacity and working time while distributing the weight, which improves handling comfort and reduces operator fatigue.
2Device complexity
If the conducting wires of the motor are exposed in the airflow directly, then the structure is simple, but the reliability is weak and the air trends to tear out the wires during high-speed operation
Solution Approach 1:
A wire fixing component is introduced as an intermediary element between the conducting wires and the airflow. This component secures the wires in place, preventing them from being torn out by the high-speed airflow, while maintaining a relatively simple overall structure.
3Reliability
If a fixation tool for installing the wires is arranged in the duct, then the reliability of wire fixing is improved, but the cost is increased and the air resistance is also increased and the blowing efficiency is reduced
Solution Approach 1:
The wire fixing component is designed with a localized structure that provides effective wire securing at the specific location where wires need to be fixed, while minimizing the overall volume and air resistance impact on the duct. The fixing structure is optimized to have minimal interference with the airflow path.
4Productivity
If the blower is operated at maximum speed to blow plenty of fallen leaves and heavy garbage, then the blowing efficiency is improved, but the operator needs to press the boost button for a long time and may feel fatigue
Solution Approach 1:
The blower operates in periodic cycles, alternating between high-speed mode (when boost button is pressed) and normal-speed mode (when boost button is released). This periodic operation allows the motor to cool down during normal-speed intervals, enabling sustained high-speed operation capability without immediate overheating, thereby reducing operator fatigue during extended use.
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 design achieves a longer working time, increased air flow rate, and improved blowing efficiency, enabling efficient operation with reduced operator fatigue and increased convenience.
Implementation Method 1
a flow-through area is formed between the inner wall of the housing and a hub of the fan
Implementation Method 2
a battery mounted on the housing, a battery pack mounted to the housing
Implementation Method 3
a motor and a fan mounted in the duct
Data Source
AI summary
A handheld blower includes a housing, the housing including an air inlet and a duct assembly, the duct assembly including a duct, a motor and a fan mounted in the duct, a battery, a handle, and a blowpipe which defines a central axis. Along the direction of the central axis, the area of the flowing cross-section of an air passage at the rear end of the fan adjacent to the air inlet is larger than that of the flowing cross-section of an air outlet of the blowpipe, and the rate between the area of the flow cross-section of the air outlet of the blowpipe and the area of the flow cross-section of the flow-through area at the position of the fan is greater than or equal to 0.8.