Blower Inlet Resonator and Muffler Structure for Noise Reduction
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Solution Overview
Problem
Existing outdoor blowers, particularly those powered by batteries, generate excessive noise due to engine and fan operation, which cannot be mitigated without compromising performance.
Innovation Solution
The blower design incorporates a conduit with an airflow generation assembly and a muffler assembly featuring a muffler wall and mount member, along with resonator devices and structures that include metamaterials and resonator passages to attenuate sound waves, targeting specific frequencies and wavelengths to reduce noise perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If power and performance level of the blower are reduced to decrease noise, then noise level is reduced, but performance deteriorates
Solution Approach 1:
The blower system is segmented into distinct functional components: the airflow generation assembly for performance and the resonator device for noise reduction. This segmentation allows each component to be optimized independently, with the resonator device specifically targeting noise frequencies without affecting the airflow generation capability of the main assembly.
Solution Approach 2:
The resonator device acts as an intermediary acoustic element between the airflow generation assembly and the external environment. It mediates the noise produced by the fan blades and engine by providing an alternative acoustic path through its passages and chambers, reducing the transmitted noise while leaving the airflow performance intact.
2Object-affected harmful factors
If resonator passages are added to reduce noise, then noise reduction is achieved, but device complexity increases
Solution Approach 1:
The resonator device is designed to perform multiple acoustic functions within a single integrated structure. The passages and chambers work together to target specific fan blade pass frequencies and engine noise frequencies simultaneously, providing broad-spectrum noise reduction without requiring multiple separate devices or complex assemblies.
Solution Approach 2:
The resonator passages and chambers are nested within the existing blower housing structure. The resonator device integrates with the inlet portion and flowpath rather than adding external complexity, with passages arranged concentrically and chambers positioned within available space to minimize overall structural complexity.
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 design effectively reduces noise levels perceived by the user while maintaining performance by absorbing, reflecting, and resonating sound waves, creating a quieter operation experience.
Implementation Method 1
resonator passages configured to reduce sound waves generated from the airflow generation assembly
Implementation Method 2
The design effectively reduces noise levels perceived by the user while maintaining performance by absorbing, reflecting, and resonating sound waves
Implementation Method 3
The design effectively reduces noise levels perceived by the user while maintaining performance by absorbing, reflecting, and resonating sound waves
Data Source
AI summary
A blower is provided, the blower including a conduit extending along a flowpath extending between an inlet portion and an outlet portion. An airflow generation assembly is positioned between the inlet portion and the outlet portion. The airflow generation assembly is configured to induce a flow of air along the flowpath from the inlet portion through the outlet portion. A muffler assembly is coupled to the inlet portion and includes a muffler wall and a mount member extending from the inlet portion to the muffler wall to form an inlet gap therebetween.