Motor Fan Cooling Flow Path Design to Reduce Heat and Flow Resistance
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Solution Overview
Problem
Conventional motor fans for handheld vacuum cleaners face challenges in balancing reduced size and weight with maintaining suction force, as high-speed rotation leads to noise, vibration, heat generation, and increased flow resistance, which compromises suction efficiency and requires power diversion for cooling.
Innovation Solution
The motor fan design incorporates a mixed-flow type impeller with a cooling flow path structure that positions the cooling flow path outlet closer to the impeller, utilizing atmospheric air for cooling without directly using motor power, minimizing flow resistance and power reduction, and optimizing the number and size of components to reduce size and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the fan motor rotates at high speed to increase power while reducing size and weight, then the power and suction force are improved, but noise, vibration, and heat generation increase
Solution Approach 1:
The patent converts the harmful heat generated by high-speed motor rotation into a beneficial cooling mechanism. The heat dissipation structure uses the motor's own rotational energy to drive air flow through the cooling path, transforming the waste heat into a useful cooling effect that prevents overheating while maintaining high-speed operation.
Solution Approach 2:
The motor fan unit performs self-cooling by utilizing its own rotational motion to drive air flow through the cooling path. The impeller's rotation creates air flow that passes through the motor housing's cooling channels, allowing the motor to cool itself without requiring external cooling systems or additional power consumption.
2Temperature
If air flow is used to cool the motor directly, then heat dissipation is improved, but flow resistance increases and suction force deteriorates
Solution Approach 1:
The patent segments the air flow paths into distinct functional zones: a suction path for maintaining vacuum performance and a cooling path for motor heat dissipation. The cooling path is positioned at the periphery of the motor housing with separate inlet and outlet openings, allowing cooling air to flow independently without interfering with the main suction flow path.
Solution Approach 2:
The cooling function is localized to specific regions of the motor housing rather than requiring global air flow modification. Cooling inlets and outlets are positioned at specific locations on the motor housing periphery, creating localized cooling zones that do not affect the overall suction performance. The cooling air flow is confined to specific channels within the housing structure.
3Weight of moving object
If the motor fan is made lightweight for handheld vacuum cleaner convenience, then user convenience is improved, but suction capability deteriorates due to low power
Solution Approach 1:
The patent employs composite construction techniques in the motor fan unit, combining lightweight materials for the housing and impeller structures with efficient electromagnetic motor design. The motor housing uses optimized material composition that reduces weight while maintaining structural integrity and magnetic properties necessary for high-speed operation and strong suction capability.
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
This design maximizes power and suction efficiency while minimizing flow resistance and power consumption, allowing for effective cooling without additional components or power usage, thus achieving a lightweight motor fan with enhanced performance.
Implementation Method 1
a flow generating part installed above the motor body part and generating an air flow; and a diffuser dispersing the air flow generated in the flow generating part
Implementation Method 2
a cooling flow path structure... utilizing atmospheric air for cooling without directly using motor power
Data Source
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AI summary
A fan motor for a vacuum cleaner includes a motor mount defining a cooling flow path inlet, an impeller, an impeller cover defining an air inlet, an air discharge opening defined at the motor mount and configured to discharge air to an outer space of the motor mount, and a cooling flow path outlet defined vertically above the motor mount. The cooling flow path inlet is configured to introduce air from the outer space of the motor mount into an inner space of the motor mount to cool the motor part, and the cooling flow path outlet is configured to discharge air from the inner space of the motor mount toward a space that is defined between the impeller and the air discharge opening based on the space between the impeller and the air discharge opening having a lower pressure than the inner space of the motor mount.