Blower Intake Pipe Noise Reduction
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Solution Overview
Problem
Conventional blowers do not effectively reduce noise from their attachments, which can contribute significantly to overall noise levels, especially when a motor is used as the prime mover.
Innovation Solution
Incorporating a sound absorbing material on the inner surface of the intake pipe within the blower's attachment, with a specific axial length and thickness range, to absorb noise caused by air flow, and allowing for detachable configurations to balance noise reduction and weight considerations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sound absorbing material is added to the intake pipe, then noise reduction is improved, but weight increases
Solution Approach 1:
The patent applies porous sound absorbing material (such as foam or fiber materials) to the inner surface of the intake pipe. The porous structure allows the material to absorb acoustic energy from the air flow while maintaining sufficient air passage. This resolves the contradiction by providing effective noise reduction through the inherent properties of porous materials without requiring solid dense structures that would significantly increase weight.
Solution Approach 2:
The sound absorbing material is applied selectively to specific portions of the intake pipe rather than the entire structure. The patent specifies that the material should be disposed on the inner surface of the intake pipe where noise generation is most significant, allowing targeted noise reduction while minimizing overall weight addition. This local application strategy balances noise control performance with weight considerations.
2Object-affected harmful factors
If sound absorbing material is added to the intake pipe, then noise reduction is improved, but device complexity increases
Solution Approach 1:
The sound absorbing material is integrated directly into the intake pipe structure, merging the noise reduction function with the existing air intake component. Rather than adding a separate noise control device, the material is applied to the inner surface of the intake pipe, combining structural and acoustic functions into a single integrated component. This reduces overall device complexity while achieving noise reduction.
Solution Approach 2:
The intake pipe structure serves dual purposes: maintaining air flow passage and providing a substrate for sound absorbing material. The existing intake pipe design inherently supports the addition of sound absorbing material without requiring fundamental structural changes, allowing the component to serve both its original function and the additional noise reduction function.
3Object-affected harmful factors
If sound absorbing material is added to the intake pipe, then noise reduction is improved, but manufacturing complexity increases
Solution Approach 1:
The sound absorbing material is applied to the intake pipe during the manufacturing process rather than as a separate post-processing step. The patent describes the material being disposed on the inner surface of the intake pipe in a manner that suggests integration into the manufacturing workflow, allowing noise reduction functionality to be built in during production. This preliminary integration simplifies the overall manufacturing process compared to adding noise control as a separate assembly step.
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 described configuration effectively reduces noise from the blower's attachment while maintaining a moderate weight and air flow capacity, enhancing user convenience and operational ease.
Implementation Method 1
A sound absorbing material is disposed on an inner surface of the intake pipe. The sound absorbing material disposed on the inner surface of the intake pipe absorbs noise caused by air flowing through the intake pipe.
Data Source
AI summary
A blower may include an operation rod extending in a front-rear direction, a rear housing disposed on a rear portion of the operation rod and housing a prime mover, and an attachment detachably attached to a front portion of the operation rod. The attachment may include an air passage pipe housing a fan driven by the prime mover; an intake pipe disposed on a rear portion of the air passage pipe, and a nozzle disposed on a front portion of the air passage pipe. A sound absorbing material may be disposed on an inner surface of the intake pipe.