Vehicle Heater Blower Noise Reduction via Partitioned Sound Insulation
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Solution Overview
Problem
Vehicle heater blowers generate significant noise due to the interaction of feed wheel blades with interrupter areas, particularly in the range of 3,000 Hz, which is perceptible to human hearing and not effectively mitigated by existing designs.
Innovation Solution
A blower design that includes a partition dividing the housing into a motor mounting space and a sound insulation space, with an air flow tube and sound insulation material to create a sound insulation chamber, utilizing reflection and absorption to reduce noise. The air flow tube has openings and is offset from the housing bottom, and sound insulation material surrounds it to enhance noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If feed wheel blades sweep the interrupter area to generate air circulation, then combustion air feed function is achieved, but noise is generated in the perceptible frequency range
Solution Approach 1:
The housing interior space is segmented into a motor mounting space and a sound insulation space by means of a partition. This segmentation isolates the noise-generating feed wheel assembly within the sound insulation space, allowing the air circulation function to continue while the noise is contained and reduced through sound insulation measures in the dedicated sound insulation space.
2Object-generated harmful factors
If sound insulation measures are added to reduce noise, then noise reduction is achieved, but device complexity increases
Solution Approach 1:
The partition extends from the housing bottom toward the open end of the housing, creating a three-dimensional sound insulation space. This spatial arrangement allows sound insulation material to be positioned in the most effective location without interfering with the feed wheel operation or requiring complex modifications to the existing housing structure.
Solution Approach 2:
A partition acts as an intermediary structure that divides the housing interior space into separate functional zones. This partition serves as both a structural element and a mounting surface for sound insulation material, providing a straightforward method to reduce noise without adding complex assemblies or modifying the feed wheel mechanism itself.
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
Substantially reduces noise propagation by combining sound reflection and absorption mechanisms within the sound insulation space, providing effective noise reduction during operation.
Implementation Method 1
sound insulation material surrounding the air flow tube be arranged in the sound insulation space
Implementation Method 2
Sound waves propagating in the air being fed can be reflected in the sound insulation chamber on the walls defining said sound insulation chamber
Data Source
AI summary
A blower, especially combustion air blower for a vehicle heater, includes a blower housing (10) with a housing bottom (14) and with a circumferential wall (16) adjoining the housing bottom (14) and defining a housing interior space (20). A partition (18) divides the housing interior space (20) into a motor mounting space (22) and a sound insulation space (24).