Duct Sound Absorption Member Attachment to Prevent Molding Defects
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Solution Overview
Problem
Existing air intake ducts for batteries lack sufficient sound absorption properties, and the integration of sound absorption members with resin sheets during molding leads to defective molding and inadequate noise suppression.
Innovation Solution
A tubular duct with a sound absorption member on its inner surface, featuring a sandwiching part with opposite wall surfaces that sandwich the sound absorption member, and an outward protrusion with a rib, forming a hollow between the protrusion and the member, or an opening for air escape, to enhance sound absorption and prevent peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a sound absorption member is integrated with a resin sheet during molding, then the sound absorption properties are improved, but defective molding occurs and manufacturing precision deteriorates
Solution Approach 1:
The duct is divided into separate components: the duct main body and the sound absorption member are manufactured independently and then assembled together. This segmentation allows each component to be optimized separately - the duct main body for molding quality and the sound absorption member for acoustic performance - thereby resolving the contradiction between sound absorption properties and molding precision.
Solution Approach 2:
The sound absorption member is prepared in advance as a separate component with predetermined shape and properties. By pre-forming the sound absorption member independently before assembly, the molding process for the duct main body is not compromised, avoiding defective molding while ensuring high sound absorption properties are achieved in the pre-prepared member.
2Object-affected harmful factors
If the sound absorption member is attached to the inner surface of the duct, then sound absorption properties are improved, but the member may peel off and reliability deteriorates
Solution Approach 1:
The duct main body and sound absorption member are combined into an integrated assembly through secure attachment mechanisms. The attachment structure merges the functional benefits of both components - the noise suppression capability of the sound absorption member with the structural integrity of the duct - while ensuring reliable connection that prevents peeling during operation.
Solution Approach 2:
An attachment structure serves as an intermediary element between the duct main body and the sound absorption member. This intermediary component facilitates secure bonding while accommodating differences in material properties and thermal expansion, thereby preventing peeling and ensuring long-term reliability of the noise suppression system.
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 solution prevents defective molding and achieves high sound absorption, effectively suppressing noise by firmly attaching the sound absorption member to the duct's inner surface, even with different material combinations, and allows for improved noise reduction.
Implementation Method 1
a sound absorption member disposed on an inner surface of the duct main body
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3(a)~3(b)
AI summary
Provided is a duct that does not cause defective molding and has a highly sound absorption inner surface which can effectively suppress noise. A duct includes a tubular duct main body and a sound absorption member disposed on the inner surface of the duct main body. The duct has at least one of configurations (1) to (3): (1) the duct main body has a sandwiching part having a pair of opposite wall surfaces, and a side edge of the sound absorption member is sandwiched between the wall surfaces of the sandwiching part; (2) the sound absorption member is pasted to the inner surface of the duct main body with a resin film therebetween; and (3) the sound absorption member and duct main body have parts which are not fused to each other.