Garden Tool Power Assembly Heat Dissipation Air Duct Design
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Solution Overview
Problem
Existing garden tools with power assemblies face issues with incomplete heat dissipation, leading to motor short-circuiting and fires when cleaned with high-pressure water, and are not suitable for high heat, high current, and high torque applications due to inadequate heat dissipation structures.
Innovation Solution
A power assembly design featuring a housing with heat dissipation air ducts, air inlets, and strategically positioned air outlets that direct airflow to effectively remove heat from the driving motor and control panel assembly, while preventing water ingress through the placement of air outlets on lateral sides, enhancing waterproof performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the air outlet is disposed on the bottom of the lower cover for heat dissipation, then heat dissipation is achieved, but water enters the power assembly during cleaning causing short-circuiting and fires
Solution Approach 1:
The air outlet is positioned asymmetrically at the bottom corner of the housing rather than centrally on the lower cover, and is oriented to face laterally. This asymmetric placement combined with directional orientation allows heat dissipation functionality while preventing water ingress during cleaning operations.
Solution Approach 2:
The air outlet orientation is changed from a vertical downward direction (prone to water ingress) to a lateral horizontal direction. This dimensional change in the outlet's facing direction enables the outlet to discharge air sideways, away from the path of water during high-pressure cleaning, thus resolving the contradiction between heat dissipation and waterproofing.
2Temperature
If the air outlet faces downward for heat dissipation, then heat can be dissipated effectively, but the power assembly cannot be cleaned with high-pressure water gun
Solution Approach 1:
The air outlet is positioned asymmetrically at the bottom corner of the housing rather than centrally on the lower cover, and is oriented to face laterally. This asymmetric placement combined with directional orientation allows heat dissipation functionality while preventing water ingress during cleaning operations.
Solution Approach 2:
The air outlet orientation is changed from a vertical downward direction (prone to water ingress) to a lateral horizontal direction. This dimensional change in the outlet's facing direction enables the outlet to discharge air sideways, away from the path of water during high-pressure cleaning, thus resolving the contradiction between heat dissipation and waterproofing.
3Device complexity
If the existing heat dissipation structure is used, then the structure is simple, but the power assembly cannot handle high heat, high current, and high torque applications
Solution Approach 1:
The heat dissipation system is segmented into multiple independent air ducts (first air duct and second air duct) with separate air inlets and outlets. The first air duct handles air intake and initial cooling, while the second air duct handles exhaust and additional cooling. This segmentation allows for more comprehensive heat dissipation coverage without proportionally increasing structural complexity, enabling the system to handle higher power applications.
Solution Approach 2:
The air outlet is repositioned from a bottom-centered location to a bottom corner location with lateral orientation. This spatial reconfiguration in three-dimensional space optimizes the heat dissipation airflow pattern, allowing better heat removal efficiency while maintaining structural simplicity, thus enabling the system to handle higher power applications.
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 solution provides efficient heat dissipation, preventing motor failures and fires, enabling the power assembly to handle high heat and torque applications while maintaining waterproof integrity, thus improving the reliability and safety of garden tools.
Implementation Method 1
the housing having at least one heat dissipation air duct formed therein for airflow passing through the driving unit, and the heat dissipation air duct having an air inlet for air intaking and an air outlet for air flowing out
Data Source
AI summary
A power assembly and a garden tool having the power assembly. The power assembly includes a housing, a driving unit received in the housing and a power supplying unit received in the housing for powering the driving unit. The driving unit includes a driving motor and a control panel assembly located upon the driving motor. The housing has at least one heat dissipation air duct formed therein for airflow passing through the driving unit. The heat dissipation air duct has an air inlet for air intaking and an air outlet for air flowing out, and the air outlet is located at a bottom of the housing and open towards a lateral side of the housing. So that the airflow entering the housing through the air inlet can sequentially flow through the control panel assembly and the driving motor, and finally flows out the housing through the air outlet to take away the heat generated by the driving unit, the working temperature of the driving unit can be reduced and the working efficiency of the power assembly can be improved.