Electric Fan Diffuser Layout for Motor Heat Dissipation
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Solution Overview
Problem
Conventional electric fans in terminal devices face poor heat dissipation of the motor assembly due to the diffuser being sleeved outside the motor, leading to reduced operational reliability and a short service life.
Innovation Solution
The electric fan design includes a diffuser assembly positioned between the impeller assembly and the stator-rotor component, allowing heat generated by the stator-rotor component to be transferred outside without hindrance, with a gap defined between the diffuser and stator-rotor component to facilitate heat dissipation, and a support member to minimize obstruction and enhance gas flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the diffuser is disposed downstream of the impeller assembly and sleeved outside the motor, then the structure is simplified and easier to manufacture, but the heat dissipation of the motor assembly deteriorates
Solution Approach 1:
The gas flow path is segmented into two independent channels: one channel directs gas from the diffuser outlet to the outside of the bracket for heat dissipation, while another channel directs gas to the interior of the stator-rotor component. This segmentation allows the diffuser to remain positioned outside the motor for manufacturing simplicity while simultaneously enabling effective heat dissipation through dedicated flow paths.
2Device complexity
If the diffuser is sleeved outside the motor, then the device complexity is reduced, but the heat dissipation performance deteriorates
Solution Approach 1:
The gas flow system is designed to serve multiple functions simultaneously: it provides both cooling for the motor assembly (by directing gas outside the bracket) and heat dissipation (by directing gas through the stator-rotor component). This multi-functionality allows the simplified structure to maintain high operational reliability through effective thermal management.
3Productivity
If the diffuser is positioned downstream of the impeller, then the airflow path is streamlined, but heat dissipation is hindered
Solution Approach 1:
The bracket serves as an intermediary structure that facilitates both streamlined airflow and effective heat dissipation. The bracket's design with its accommodation region and outlet structure enables the gas to flow efficiently from the diffuser while providing pathways for heat dissipation, thus mediating between the conflicting requirements of airflow efficiency and thermal management.
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
Improves heat dissipation of the motor assembly, enhancing operational reliability and extending the service life of the electric fan by effectively dissipating heat from the stator-rotor component.
Implementation Method 1
a part of gas passing through the diffuser assembly is configured to flow toward an outside of the bracket, and another part of the gas is configured to flow toward an interior of the stator-rotor component
Data Source
AI summary
An electric fan includes a motor assembly, an impeller assembly, and a diffuser assembly. The motor assembly includes an output shaft, a bracket, and a stator-rotor component. The bracket and the stator-rotor component are both sleeved on the output shaft; the bracket has an accommodation region, and the stator-rotor component is disposed in the accommodation region. The impeller assembly is disposed on a side of the stator-rotor component and is sleeved on the output shaft; the diffuser assembly is sleeved on the output shaft and is disposed between the stator-rotor component and the impeller assembly.