Electric Blower Housing Segmentation for Motor Cooling
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Solution Overview
Problem
Electric blowers with a motor width equal to or larger than the blade width experience pressure loss in air current flow, reducing aerodynamic efficiency.
Innovation Solution
An electric blower design featuring a mixed-flow fan, a permanent magnet synchronous motor, and a housing configuration with specific openings and portions that guide air flow, including a guide portion within the motor to direct air and a smaller inner diameter for the motor portion, reducing air path extension and pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the width of the motor portion is equal to or larger than the width of the blade portion, then the motor can be adequately housed and cooled, but pressure loss occurs in the air current flow path
Solution Approach 1:
The housing is divided into three distinct portions: a first portion surrounding the mixed-flow fan, a second portion surrounding the permanent magnet synchronous motor, and a third portion connecting them. This segmentation allows the air flow path to be optimized separately from the motor housing dimensions, enabling the motor to be adequately housed while maintaining efficient air flow without pressure loss.
Solution Approach 2:
The third portion acts as an intermediary transition zone between the first portion (blade housing) and the second portion (motor housing). This intermediate section smoothly connects the different width requirements, allowing the air current to transition from the wider blade area to the narrower motor area without creating turbulence or pressure loss, while still providing adequate space for motor cooling.
2Temperature
If the air path is extended to cool the motor, then heat dissipation improves, but aerodynamic efficiency decreases
Solution Approach 1:
The housing design implements local quality by making the inner diameter of the second portion (motor portion) smaller than the inner diameter of the first portion (blade portion). This localized dimensional change allows the air path to be sufficiently long for motor cooling while maintaining a compact overall structure that preserves aerodynamic efficiency. The air flow path is optimized locally at each section rather than uniformly throughout.
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 design enhances aerodynamic efficiency by minimizing pressure loss and allowing effective heat radiation from the motor, leading to improved performance and longevity of the electric blower.
Implementation Method 1
a permanent magnet synchronous motor to rotate the mixed-flow fan
Implementation Method 2
a mixed-flow fan to generate a current of air
Implementation Method 3
a guide portion provided inside the third portion in a radial direction and to guide the air in a second direction
Implementation Method 4
it is possible to form, between the housing and the motor, a vent path (air path) as a path through which an air current generated by the moving blade passes
Implementation Method 5
allowing effective heat radiation from the motor
Data Source
AI summary
An electric blower includes an air blowing unit including a mixed-flow fan to generate a current of air, a motor to rotate the mixed-flow fan, and a housing including a first portion surrounding the mixed-flow fan in a circumferential direction, and a second portion surrounding the motor in the circumferential direction. The inner diameter of the second portion is smaller than the inner diameter of the first portion.