Vacuum Cleaner Motor Airflow Split 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 most of the air passes through the space between the motor housing and the stator core, restricting the amount of noise that can be absorbed.
Innovation Solution
A motor-noise absorbing apparatus with a body fixed on the motor housing, 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, which can be grill-shaped or porous, to restrict air flow into the space between the motor housing and stator core, thereby reducing noise by controlling air discharge paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If air is discharged through the space between the motor housing and stator core, then the suction force is maintained, but the flow noise increases due to collision with complex structures
Solution Approach 1:
The air discharge path is segmented into two separate channels: a first air discharge passage for most of the air flow (to maintain suction force) and a second air discharge passage for a portion of the air flow (to reduce noise). This segmentation allows the air flow to be divided into different paths with different functions, resolving the contradiction between maintaining productivity and reducing harmful noise.
Solution Approach 2:
Different regions of the air discharge system are given different qualities: the first air discharge passage is designed for high-volume flow to maintain suction force, while the second air discharge passage is designed with noise-reducing characteristics (grill-shaped or porous structure) to reduce flow noise. This local differentiation allows each region to optimize for its specific function.
2Object-generated harmful factors
If a noise absorbing member is inserted to disturb air flow, then the flow noise is reduced, but the suction force decreases
Solution Approach 1:
Instead of inserting a noise absorbing member that disturbs the entire air flow, the invention segments the air flow into two paths. The first path (first air discharge passage) maintains unobstructed flow to preserve suction force, while the second path (second air discharge passage with grill-shaped or porous structure) handles a portion of the air flow in a noise-reducing manner. This segmentation resolves the contradiction by applying noise reduction only to the extent necessary without compromising overall productivity.
3Object-generated harmful factors
If the second air discharging part is made grill-shaped or porous, then the noise absorption is enhanced, but the air flow resistance increases
Solution Approach 1:
The second air discharging part handles only a portion of the total air flow rather than all of it. By designing this partial flow path with grill-shaped or porous structures that provide enhanced noise absorption, the invention achieves effective noise reduction without requiring the entire air flow system to overcome high resistance. The first air discharge passage compensates by handling the majority of air flow with lower resistance, thus resolving the contradiction between noise absorption and energy 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 apparatus effectively reduces noise levels while maintaining suction force, with noise levels below 103.83dBA and suction force above 95% of the baseline, demonstrating superior performance compared to conventional designs.
Implementation Method 1
a motor-noise absorbing apparatus capable of absorbing and reducing flow noise generating by air, which is discharged in a high speed from an impeller
Implementation Method 2
The air forced into the guide vein flows out through a space S 1 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.
Data Source
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AI summary
A motor-noise absorbing apparatus (100) of a vacuum cleaner is disclosed. The motor-noise absorbing apparatus (100) includes a body (110) 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 (120) formed in the middle of the body (110), 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 (130) formed to penetrate a peripheral part of the body (110), so that a portion of the air coming out of the guide vein is discharged between the motor housing and the stator core.