Handheld blower having engine cooling flow
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Solution Overview
Problem
Current handheld garden blowers face issues with limited application scope due to external power supply dependency, increased weight and fatigue from large battery packs, inefficient air flow due to wire placement, and inconvenient operation requiring two hands for maximum speed.
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 increases airflow efficiency and reduces resistance, allowing one-handed operation and extended use.
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 a first battery and a second battery, with each battery having a first electrode assembly and a second electrode assembly. The first electrode assemblies are arranged adjacently and the second electrode assemblies are arranged adjacently, forming a segmented structure that reduces overall weight while maintaining sufficient capacity for extended operation.
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 includes a wire fixing cavity that receives and secures the conducting wires, preventing them from being torn out by the airflow during high-speed operation while maintaining structural simplicity.
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 merged with the motor assembly structure, where the wire fixing cavity is formed as an integral part of the motor assembly. This integration eliminates the need for separate fixation tools in the duct, reducing air resistance and maintaining blowing efficiency while ensuring reliable wire fixation.
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 two hands are needed for controlling the members and the operator may feel fatigue during long times of operation
Solution Approach 1:
The handle is designed with a counterweight structure that balances the weight distribution of the handheld blower. This counterweight arrangement reduces the effort required to control the device during operation, allowing operators to maintain maximum speed operation with one hand for extended periods without fatigue.
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 enhances blowing efficiency, reduces operator fatigue, and extends working time while maintaining a compact and lightweight structure, capable of handling large air flow rates for effective leaf and debris removal.
Implementation Method 1
a fan mounted in the duct
Implementation Method 2
the battery of the handheld blower has a capacity larger than 170 wh
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.