Resonance Flow Path Noise Reduction for Vacuum Cleaners

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing noise reduction technologies for cleaners are ineffective in reducing flow noise (base noise) and increase production costs due to the use of specialized noise absorption members, limiting their applicability to various types of cleaners and affecting standardization.

Innovation Solution

A noise reduction device utilizing a first flow path and a second flow path with varying dimensions and orientations to create a resonance sound-absorbing effect, which surrounds the second flow path, effectively reducing noise without affecting cleaning performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If internal/external noise absorption members are used to reduce motor noise, then noise reduction effect is improved, but production cost increases and standardization becomes difficult

Engineering Contradiction:

Improvemotor noiseVSAvoidproduction cost

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The noise reduction function is segmented into two parts: motor noise reduction is handled by the existing vibration isolation cover, while air flow noise reduction is achieved through the resonance flow path structure. This segmentation allows each component to address specific noise sources without requiring expensive specialized materials throughout the entire system.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The resonance flow path structure serves multiple functions: it reduces air flow noise through resonance, guides air discharge away from users, and maintains cleaning performance. This multi-functionality eliminates the need for separate expensive noise absorption members, achieving cost reduction while maintaining effectiveness.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Object-affected harmful factors

If air outlet is blocked to reduce noise, then noise reduction effect is improved, but suction performance is reduced

Engineering Contradiction:

Improvenoise at air outletVSAvoidsuction performance

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The invention utilizes acoustic resonance within the resonance flow path to reduce noise. The flow path is designed with specific dimensions to create resonant frequencies that counteract the noise generated by air discharge, allowing noise reduction without blocking the air outlet and thus maintaining suction performance.

Inventive Principle:

Principle #18Mechanical vibration

3Shape

If inclined grill is provided for air discharge, then air discharge direction is improved, but noise reduction effect is insufficient especially for flow noise

Engineering Contradiction:

Improveair discharge directionVSAvoidflow noise

Core Design Contradiction:

ShapeVSObject-affected harmful factors

Solution Approach 1:

The resonance flow path acts as an intermediary structure between the air outlet and the surrounding environment. It not only guides air discharge in a controlled direction but also serves as a resonant chamber that reduces flow noise through acoustic resonance, addressing both air discharge direction and noise reduction effectively.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Object-affected harmful factors

If noise absorption members are used, then noise reduction effect is improved, but adaptability to various cleaner types is reduced

Engineering Contradiction:

ImprovenoiseVSAvoidapplicability to various cleaner types

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The resonance flow path is designed with adjustable parameters including length, width, and thickness that can be modified to match different cleaner types and noise characteristics. This parametric design allows the same basic structure to be adapted to various cleaner configurations without requiring completely different noise reduction solutions for each type.

Inventive Principle:

Principle #35Parameter changes

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 device achieves noise reduction across various frequencies by utilizing resonance, preventing air discharge towards the user, and maintaining cleaning efficiency while being cost-effective and adaptable to different cleaner types.

Implementation Method 1

as for the air drawn in through an air inlet of the impeller, noise is canceled out by generating mutual resonance between a noise waveform of air introduced into a cylindrical support stand and a noise waveform of air passing through an air hole of the support stand

Methodology Applied

Scientific EffectResonance: Resonance

Implementation Method 2

A noise reduction device utilizing a first flow path and a second flow path with varying dimensions and orientations to create a resonance sound-absorbing effect

Methodology Applied

Scientific EffectAcoustic absorption: Acoustic Absorption

Data Source

PatentEP4480368B1Noise reduction device for cleaners

Publication Date: 2026.03.25 LG ELECTRONICS INC

Figure 1~2
Figure 3~4a
Figure 4b~5

AI summary

A noise reduction device for cleaners according to an embodiment of the present disclosure includes: a first flow path having a first end communicating with an air outlet and a second end that is open, the first flow path extending in a first direction; and a second flow path having a first end connected between the first end and the second end of the first flow path and a second end that is closed, the second flow path extending in a second direction intersecting the first direction, wherein the first flow path is disposed to surround the second flow path.