Electric tool
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Solution Overview
Problem
Electric tools, particularly centrifugal blowers, generate significant noise due to the fan and motor components, which is a challenge for reducing noise while maintaining functionality.
Innovation Solution
The electric tool incorporates a noise reduction structure featuring a housing with a surrounding structure that partially surrounds the power apparatus, creating a second opening oriented differently from the first ventilation opening. This configuration, combined with a blocking structure and vibration-reducing members, helps to isolate and absorb noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional components are used without modification, then the device complexity is low, but noise emissions are high
Solution Approach 1:
The surrounding structure is nested within the housing and partially surrounds the power apparatus, creating internal compartments without adding external complexity. The blocking structure is integrated into the housing wall, forming part of the existing structure rather than a separate component.
Solution Approach 2:
The first opening and second opening are positioned at different orientations (different spatial dimensions) on the housing, allowing noise reduction through directional separation of air intake and exhaust paths without requiring additional external structures.
2Object-generated harmful factors
If a surrounding structure is added to surround the power apparatus, then noise is reduced, but device complexity increases
Solution Approach 1:
The surrounding structure is merged with the housing to form an integrated assembly. The blocking structure is combined with the housing wall, eliminating the need for separate noise reduction components and reducing overall device complexity.
Solution Approach 2:
The surrounding structure serves multiple functions: it provides mechanical support for the power apparatus, acts as a noise barrier, and defines the second opening for exhaust flow. The housing simultaneously provides structural support and incorporates noise reduction features.
3Object-generated harmful factors
If openings are positioned at different orientations, then noise propagation is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The housing is segmented into distinct regions with the first opening and second opening positioned on different faces. This segmentation allows each opening to be manufactured independently with standard precision, avoiding the need for high-precision multi-axis alignment.
Solution Approach 2:
Different regions of the housing have different functional requirements: the first opening region prioritizes air intake efficiency while the second opening region prioritizes noise reduction. This allows each opening to be optimized locally without requiring global precision across the entire housing 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 described noise reduction structure effectively minimizes noise emissions from electric tools by redirecting and absorbing sound waves, thereby enhancing user experience and compliance with noise regulations.
Implementation Method 1
the first opening and the second opening having different orientations
Implementation Method 2
the blocking structure is arranged close to the first opening
Implementation Method 3
one or more vibration-reducing members are preferably provided between the housing and the surrounding structure
Data Source
AI summary
Disclosed in the present invention is an electric tool, comprising: a housing, comprising a first opening; working equipment; a power apparatus, at least partially located in the housing and driving the working equipment; a surrounding structure, at least partially surrounding the power apparatus, the surrounding structure defining a second opening; and a blocking structure located between the first opening and the second opening.