Vacuum Cleaner Motor Airflow Routing for Lower Flow Noise
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Solution Overview
Problem
Conventional motor-noise absorbing apparatuses for vacuum cleaners are limited in their ability to absorb and reduce flow noise generated by air colliding with complex structures within the motor housing, as they primarily rely on metal nets that restrict the absorption of collision noise.
Innovation Solution
A motor-noise absorbing apparatus with a body fixed between the motor housing and stator core, featuring a first air discharging part to direct most air into the space between the stator core and rotor, and a second air discharging part, such as grill-shaped or porous parts, to control the air flow between the motor housing and stator core, reducing noise by restricting air discharge into the motor housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If air is discharged in high speed from the impeller through the guide vein to the motor housing windows, then suction force is generated, but flow noise is generated due to air colliding with complex structures like brushes and bracket
Solution Approach 1:
The patent extracts the harmful air flow path from the motor housing interior by introducing a separate air discharge passage that bypasses the complex internal structures (brushes, bracket). The air discharge passage leads to an air discharge hole formed in the motor housing, allowing air to be discharged outside the motor housing without colliding with internal components, thereby eliminating flow noise while maintaining suction force generation.
2Object-generated harmful factors
If metal net is used to absorb noise, then some noise reduction is achieved, but collision noise from air flowing through complex structures cannot be sufficiently absorbed
Solution Approach 1:
The patent introduces an intermediary air discharge passage that mediates between the guide vein and the external environment. This passage serves as a dedicated channel that guides air flow away from the complex internal structures (brushes, bracket) before air is discharged through the motor housing windows, preventing direct collision and the associated noise generation.
3Object-generated harmful factors
If air flow path is simplified to reduce noise, then collision noise is reduced, but suction force generation may be compromised
Solution Approach 1:
The patent segments the air discharge function into two distinct paths: (1) the original path through the guide vein and motor housing windows for maintaining suction force, and (2) a new air discharge passage with an air discharge hole for noise reduction. This segmentation allows the system to maintain effective air flow for suction while separately addressing the noise problem through the dedicated discharge passage.
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 apparatus effectively reduces noise levels by directing air flow to minimize collisions with complex structures, achieving noise reduction while maintaining suction force efficiency, with noise levels below 103.83 dBA and suction force above 95% of the baseline.
Implementation Method 1
The air forced into the guide vein flows out through a space S1 between the stator core 11 and the rotor 17 in the motor housing 10 and a space S2 between the motor housing 10 and the stator core 11. At this time, the air cools the stator core 11 and the rotor 17.
Implementation Method 2
After air is taken into the impeller cover 29 through the air inlet 29a thereof by the rotating force of the impeller 23, it is forced out in a high speed from the impeller 23 by an impeller vein formed in the impeller 23, which rotates in a high speed
Data Source
AI summary
A motor-noise absorbing apparatus of a vacuum cleaner is disclosed. The motor-noise absorbing apparatus includes a body seated and fixed on a peripheral part of an opening of a motor housing to close between the motor housing and a stator core and, thus, to restrict an amount of the air discharged between the motor housing and the stator core, a first air discharging part formed in the middle of the body, so that most of the air comes out of the guide vein is discharged between the stator core and a rotor, and at least one second air discharging part formed to penetrate a peripheral part of the body, so that a portion of the air coming out of the guide vein is discharged between the motor housing and the stator core.