Backpack Blower Intake Gap Foam Layout for Noise Reduction
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Solution Overview
Problem
Backpack suction/blower apparatuses generate excessive noise during operation, particularly when used in populated areas, due to sound radiation from the intake side of the blower unit.
Innovation Solution
The integration of sound attenuating elements in the intake gap, both laterally and on the back plate, along with a radially widened blower tube section, effectively reduces noise by minimizing sound radiation in lateral directions while maintaining adequate intake airflow, utilizing materials like open pore plastic foam and melamine resin foam for thermal insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the blower unit is mounted with an intake gap between the blower unit and the back carrier frame to ensure adequate air induction, then the air intake performance is improved, but the noise radiation in lateral directions increases
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different regions of the intake gap. The lateral regions are filled with sound attenuating elements to reduce noise radiation, while the upward and downward regions remain open to maintain adequate air intake. This selective treatment of different spatial zones allows simultaneous optimization of both air intake performance and noise reduction.
Solution Approach 2:
The sound attenuating elements act as intermediary components inserted into the lateral portions of the intake gap. These elements mediate between the need for open air intake and the requirement to reduce noise radiation, allowing air to pass through while attenuating sound waves in lateral directions.
2Object-generated harmful factors
If sound attenuating elements are added to the intake gap to reduce noise radiation, then the noise level is reduced, but the device complexity increases
Solution Approach 1:
The patent employs porous sound attenuating elements (such as foam materials) to reduce noise radiation from the intake gap. These porous materials provide effective sound attenuation while maintaining a relatively simple structural form that can be integrated into the existing blower unit configuration.
Solution Approach 2:
The sound attenuating elements are segmented and positioned specifically in the lateral regions of the intake gap, rather than filling the entire gap. This segmentation allows the patent to achieve noise reduction in critical lateral directions while preserving air intake paths in upward and downward directions, thereby limiting the increase in device 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 solution significantly reduces noise levels in the ambient environment by attenuating sound radiation, primarily in lateral directions, while ensuring effective airflow and ease of assembly, thus providing a more ergonomic and quieter operation.
Implementation Method 1
The intake gap is filled with a sound attenuating element in a lateral direction referred to the usual work position
Implementation Method 2
utilizing materials like open pore plastic foam and melamine resin foam for thermal insulation
Data Source
AI summary
A backpack suction/blower apparatus has a blower unit (1) which includes a drive motor (2), a blower (3), which is driven by the drive motor (2), and a blower tube (4) extending from the blower (3). A back carrier frame (5) is provided on which the blower unit (1) is attached at a spacing while forming an intake gap (6). The intake gap (6) is filled with a foam attenuating element (8) in the lateral direction (7) referred to the usual working position.