Compressed Air Sound Attenuator With Deflection Element
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Solution Overview
Problem
Current soundproofing systems for compressed air treatment in motor vehicles do not adequately meet the increasingly stringent noise emission requirements, as they fail to effectively reduce noise emissions from compressed air expansion.
Innovation Solution
A soundproofing system with a muffler housing and additional sound reduction device featuring a deflection element, such as a baffle plate, upstream of the conventional silencing system, which deflects compressed air to disperse sound waves and includes an intermediate space for dirt accumulation, ensuring compatibility with air dryer devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional silencer with sound-reducing material is used, then noise reduction is achieved, but noise emissions are not sufficiently reduced to meet stringent requirements
Solution Approach 1:
The silencer is divided into multiple functional sections: a first sound-reducing section with sound-reducing material, a second sound-reducing section with sound-reducing material, and an intermediate expansion space between them. This segmentation allows the compressed air to undergo multiple noise reduction stages with expansion in between, achieving superior noise reduction compared to conventional single-section silencers.
Solution Approach 2:
The expansion space is nested within the housing between the two sound-reducing sections, creating a compact multi-functional structure. The diffuser is also integrated into the housing, allowing the compressed air to expand and mix with ambient air within the same housing structure, maximizing space utilization and noise reduction efficiency.
2Device complexity
If compressed air is discharged directly through the silencer, then the structure is simple, but sound waves are not effectively dispersed
Solution Approach 1:
The diffuser introduces a dimensional change by allowing compressed air to expand not only axially but also radially into the expansion space and mix with ambient air. This multi-directional expansion effectively disperses sound waves in multiple dimensions, enhancing noise reduction without significantly complicating the overall structure.
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 system achieves enhanced noise reduction by dispersing sound waves and accommodating dirt particles, making it suitable for use upstream of air dryer devices, thereby meeting stricter noise emission standards.
Implementation Method 1
at least one deflection element for deflecting the compressed air flowing in through the inflow opening in the direction of the at least one outflow opening
Implementation Method 2
a noise reduction device for reducing flow noise of a compressed air flowing through it, which is arranged in the housing between the inlet opening and the at least one outlet opening
Data Source
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AI summary
The invention relates to a sound attenuator system of a compressed air treatment system of a motor vehicle, comprising a sound attenuator (24, 30) which has a housing (40) with an inlet opening (48) and at least one outlet opening (50), as well as a noise-reduction device (52) which reduces the flow noises of compressed air as it flows through same, and is arranged in the housing (40) between the inlet opening (48) and the at least one outlet opening (50). The sound attenuator system proposed here also comprises an additional noise-reduction device (58) which reduces the flow noises of compressed air as it flows through same, and is arranged upstream of the noise-reduction device (52). This additional noise-reduction device (58) comprises an inflow opening (62), at least one outflow opening (70) and at least one deflection element (64) for deflecting, in the direction of the at least one outflow opening (70), the compressed air flowing in through said inflow opening (62).