Cleaner Noise Reduction Using Dual Flow Path Acoustic Interference
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Solution Overview
Problem
Existing noise reduction devices for cleaners are ineffective in reducing flow noise (base noise) and often increase production costs due to the use of internal and external noise absorption members, and are not easily adaptable to various types of cleaners.
Innovation Solution
A noise reduction device that includes a first flow path connected to the air outlet and a second flow path extending in a direction intersecting the first flow path, where the air introduced through the first flow path is reflected back with an opposite phase, creating destructive interference to reduce noise without affecting the cleaner's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sound insulation structure is provided for air outlet, then noise is reduced, but suction performance is reduced
Solution Approach 1:
The air outlet is segmented into multiple air outlet holes arranged in an array, allowing selective positioning of noise reduction structures at specific locations while maintaining overall airflow capacity. This segmentation enables partial noise reduction without completely blocking the air outlet.
Solution Approach 2:
The noise reduction structure is positioned at specific local areas around the air outlet holes rather than uniformly covering the entire outlet. This local application reduces noise from critical directions while preserving airflow paths, achieving noise reduction without sacrificing suction performance.
2Object-affected harmful factors
If internal and external noise absorption members are used, then noise is reduced, but production cost increases
Solution Approach 1:
The noise reduction function is extracted from complex internal/external absorption member systems and implemented through a simplified structure using basic acoustic principles. The invention uses a grill with inclined surfaces and air outlet hole arrays that leverage flow dynamics and acoustic interference rather than expensive absorption materials.
Solution Approach 2:
The noise reduction structure uses inexpensive materials and simple geometric forms (grill with inclined surfaces and hole arrays) rather than costly noise absorption members. This approach achieves effective noise reduction through clever design rather than expensive materials, significantly reducing production costs.
3Ease of operation
If inclined grill is provided for air discharge, then air flow is guided, but flow noise is not reduced effectively
Solution Approach 1:
The air outlet holes are arranged asymmetrically in specific patterns around the air outlet, and the inclined surfaces of the grill are positioned at specific angles. This asymmetric arrangement creates controlled acoustic interference patterns that cancel flow noise while maintaining effective air flow guidance.
Solution Approach 2:
The inclined grill surfaces and hole array are designed to create preliminary acoustic counter-actions that interfere with and cancel the generated flow noise before it propagates outward. The structure pre-establishes noise-canceling pathways that actively counteract the harmful flow noise.
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
Significantly reduces noise across various frequency ranges without increasing the cleaner's size or production costs, and is adaptable to different types of cleaners.
Implementation Method 1
an incident wave introduced into the second flow path is reflected from a second end of the second flow path, and thus has an opposite phase to the reflected wave, so that noise is reduced
Data Source
AI summary
A noise reduction device for cleaners 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.