Blower apparatus and vacuum cleaner
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Solution Overview
Problem
Existing electric blowers face challenges in efficiently correcting the balance of the rotor at the upper and lower end portions of the shaft, leading to decreased blowing efficiency.
Innovation Solution
The blower apparatus includes a motor with a rotor, stator, and impeller, where the impeller has a base portion with blades and an annulus fixed to the shaft, and a housing with protrusions that guide airflow to reduce vortex formation and enhance blowing efficiency by improving airflow distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional rotor structure with shaft, stator, and impeller is used, then the basic blowing function is achieved, but the balance correction at upper and lower end portions of the shaft is inefficient
Solution Approach 1:
The housing includes protrusions positioned at specific locations to guide airflow locally, reducing vortex formation in critical areas. The impeller features an annulus with specifically designed upper and lower end portions to improve balance correction at these locations, allowing localized optimization without redesigning the entire rotor structure.
Solution Approach 2:
The protrusions in the housing act as intermediary structures that modify airflow patterns between the impeller and housing walls. These protrusions guide the airflow to reduce harmful vortices, serving as a mediator that improves overall blowing efficiency without directly altering the rotor's rotating components.
2Productivity
If the impeller rotates at high speed to increase blowing efficiency, then airflow generation is improved, but vortex formation increases and reduces efficiency
Solution Approach 1:
The protrusions in the housing are strategically positioned to intercept and redirect the harmful vortices that naturally form during high-speed rotation. By converting the vortex-prone airflow pattern into a more controlled flow, the protrusions transform a harmful effect into a manageable condition, maintaining high blowing efficiency while reducing vortex-related losses.
Solution Approach 2:
Rather than attempting to control the entire airflow field uniformly, the invention applies localized flow control features (protrusions) at specific locations where vortices are most problematic. This localized approach efficiently reduces vortex formation in critical areas while maintaining overall high-speed rotation performance.
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 suppresses the decrease in blowing efficiency by reducing vortex generation and improving airflow guidance, ensuring consistent airflow and enhanced performance.
Implementation Method 1
an impeller that is below the stator, and is fixed to the shaft
Implementation Method 2
a motor that includes a rotor including a shaft extending along a vertically extending central axis, and a stator opposing the rotor in a radial direction
Data Source
AI summary
A blower apparatus includes a motor including a rotor including a shaft extending along a vertically extending central axis, and a stator opposing the rotor in a radial direction, an impeller below the stator and fixed to the shaft, and a housing surrounding an outer side of the impeller in the radial direction. The impeller includes a base portion that widens in a direction intersecting the central axis, and blades arranged on an upper surface of the base portion along a circumferential direction. An annulus is fixed to an upper end portion of the shaft.