Reverse-Airflow Motor Housing for Low-Noise Cooling
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Solution Overview
Problem
Current motor-operated appliances face issues with noise generation at high rotational speeds due to misalignment of motor shafts and poor heat management, leading to premature failure and increased noise from fans, which existing solutions attempt to address with complex air passage baffling and sound deadening materials.
Innovation Solution
The appliance features a reverse air flow motor housing with a ventilation fan that draws in ambient air, routes it through a shroud and radial vanes, and expels it radially through sidewall ports, reducing noise without additional materials or complexity, while accommodating misalignment with a multi-sided ball and pocket configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional ventilating fans are used to cool the motor, then heat management is improved, but noise is increased due to heated air being directed through the fan
Solution Approach 1:
The patent inverts the conventional airflow direction by introducing a diffuser that reverses the flow path. Instead of air being drawn in and immediately exhausted through the fan, the diffuser creates a reversed flow that allows ambient air to enter, cool the motor, and exit through a different path, thereby reducing the noise generated by the fan while maintaining effective cooling
2Quantity of substance
If axial construction fans are used to draw in and exhaust air axially, then mass air flow is improved, but noise is increased and pressure generation is minimal
Solution Approach 1:
The patent transitions from axial airflow to radial airflow by implementing a centrifugal fan design. This dimensional change in airflow pattern allows the fan to generate both high mass air flow and significant pressure, while the radial configuration inherently reduces noise compared to axial fans operating at high speeds
3Speed
If motor shaft and receiving component are coupled directly, then rotational speed is achieved, but misalignment causes premature failure
Solution Approach 1:
The patent introduces a dynamic coupling mechanism with floating elements that can self-adjust and accommodate misalignment between the motor shaft and receiving component. This dynamic design allows the coupling to absorb dimensional variations and maintain reliable operation at high rotational speeds without premature failure
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 configuration effectively reduces noise and improves heat management by directing airflow and noise spectrum internally, reducing fan noise and extending appliance lifespan without increasing housing size or adding noise abatement materials.
Implementation Method 1
a ventilation fan rotated by the rotatable shaft... rotation of the ventilation fan draws in ambient air through the air intake port which then proceeds between the casing and the motor
Data Source
Figure 1~4
Figure 5
AI summary
An appliance includes a reverse air flow motor housing. A casing carries and supports a motor, and a ventilation fan is rotated by a rotatable shaft driven by the motor. A lower platform with an air intake port carries a ventilation shroud that partially encloses the ventilation fan. An inner support is mounted between the lower platform and the casing. An outer housing has a sidewall that substantially encloses the motor and is supported by the lower platform. Rotation of the ventilation fan draws in ambient air through the air intake port which then proceeds between the casing and the motor and subsequently through the sidewall port.