Vacuum Cleaner Guide Fan Assembly for Low-Loss Airflow Sealing
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Solution Overview
Problem
Existing fan motor assemblies in vacuum cleaners experience flow loss due to deformities like burrs in the diffuser, leading to variations in motor performance and decreased efficiency.
Innovation Solution
A fan motor assembly with a guide fan system comprising a first guide unit with a circular panel and diffuser, and a second guide unit with a ring-shaped sealing member and return vane, which minimizes air flow loss by increasing air pressure and guiding it towards the motor, while the sealing member prevents air flow between the guide unit and the case.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a guide fan is formed by an injection process, then the manufacturing efficiency is improved, but deformities such as burrs are generated on the upper collar of the diffuser causing flow loss
Solution Approach 1:
The guide fan is divided into two separate parts: the diffuser (first guide unit) and the upper collar (second guide unit). This segmentation allows each part to be manufactured separately with appropriate processes, avoiding the burr generation issue while maintaining manufacturing efficiency.
Solution Approach 2:
The problematic upper collar portion is extracted as a separate component (second guide unit) from the injection-molded diffuser. This removes the source of burrs and flow loss from the injection process while preserving the manufacturing advantages for the main diffuser body.
2Ease of manufacture
If the upper collar of the diffuser has deformities such as burrs, then the manufacturing process is simplified, but flow loss occurs and motor performance varies
Solution Approach 1:
The upper collar is extracted as a separate component that does not undergo injection molding, thereby eliminating the burr formation issue while keeping the diffuser manufacturing simple through injection processes.
Solution Approach 2:
A sealing member is introduced as an intermediary component between the diffuser and the case. This sealing member ensures proper sealing without requiring high precision in the injection-molded diffuser, thus maintaining manufacturing simplicity while ensuring reliable performance.
3Ease of manufacture
If flow loss increases, then the manufacturing cost is reduced, but motor efficiency decreases and performance varies
Solution Approach 1:
By segmenting the guide fan into a diffuser and a separate upper collar, the design achieves proper airflow guidance without the need for complex high-precision injection molding, thus maintaining low manufacturing cost while reducing flow loss and improving motor efficiency.
Solution Approach 2:
The sealing member acts as an intermediary that ensures proper sealing and airflow guidance without requiring expensive high-precision manufacturing, thereby maintaining cost-effectiveness while improving motor efficiency by reducing flow loss.
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 enhances motor efficiency by reducing air flow loss and improving vacuum cleaner performance, as demonstrated by increased vacuum levels and efficiency in simulation tests.
Implementation Method 1
rotating a motor having a rotor configured to rotate with respect to a stator through an electromagnetic force
Implementation Method 2
a diffuser provided at the panel member
Implementation Method 3
a sealing member provided to prevent air flow from being generated between the second guide unit and the case
Data Source
AI summary
A fan motor assembly capable of improving efficiency of a motor by minimizing flow loss, and a vacuum cleaner having the same includes a case, a motor installed inside the case to form a suction force, an impeller rotatably installed on a shaft of the motor, and a guide fan configured to guide air that is suctioned by the motor, wherein the guide fan includes a first guide unit configured to increase pressure of the suctioned air and a second guide unit provided at an upper side of the first guide unit to be in contact with the case.