Vacuum Cleaner Fan Motor Cooling Path for High-Speed Suction
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Solution Overview
Problem
Conventional fan motors for handheld vacuum cleaners face challenges in increasing power while reducing size and weight, leading to poor suction capability due to high-speed rotation issues such as noise, vibration, heat generation, and increased flow resistance, which also reduce motor power and suction force.
Innovation Solution
A fan motor structure with a cooling flow path that integrates a motor mount with a cooling flow path inlet and outlet, an impeller, and a diffuser, allowing air to flow naturally for cooling without using motor power, thereby minimizing power reduction and flow resistance, and incorporating a mixed-flow type fan and diffuser to optimize suction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the fan motor is made lightweight for handheld vacuum cleaner, then user convenience is improved, but suction capability deteriorates due to low power
Solution Approach 1:
The patent increases the rotational speed parameter of the fan motor to compensate for the reduced power capacity of the lightweight motor design, thereby maintaining suction capability despite the lower weight
2Power
If the fan motor rotates at high speed to increase power while reducing size and weight, then power is improved, but noise and vibration increase
Solution Approach 1:
The patent converts the harmful heat generated by high-speed rotation into a beneficial cooling mechanism by designing a cooling flow path that utilizes the motor's own operational heat to drive airflow through the motor housing, thereby cooling the motor while maintaining high-speed operation
3Temperature
If air flow is used to cool the motor part, then heat dissipation is improved, but motor power for suction force is reduced
Solution Approach 1:
The patent designs the motor housing to serve dual functions: as both the structural enclosure for the motor and as a cooling flow path that guides airflow to dissipate heat, thereby achieving heat dissipation without requiring additional power-consuming cooling mechanisms
4Temperature
If air flow directly cools the motor part, then cooling efficiency is improved, but flow resistance at exhaust side increases which deteriorates suction force
Solution Approach 1:
The patent segments the motor housing into distinct functional zones: a cooling flow path inlet, a cooling flow path outlet, and a separate exhaust opening. This segmentation allows cooling airflow and suction airflow to operate independently, preventing the cooling system from increasing exhaust flow resistance and maintaining suction force
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 maximizes power and suction force while reducing the size and weight of the fan motor, minimizing power loss for cooling, and enhancing suction efficiency by directing airflow efficiently, thus addressing the limitations of conventional designs.
Implementation Method 1
a cooling flow path inlet configured to receive air to reduce heat generated in the motor part
Implementation Method 2
an air discharge opening configured to discharge air that is suctioned through the air inlet and pressurized by the impeller
Implementation Method 3
incorporating a mixed-flow type fan and diffuser to optimize suction efficiency
Data Source
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.