Power assembly and surface-cleaning device
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for reducing fan noise in cleaning devices are inadequate, leading to a negative user experience due to residual noise after vibration and sound absorption techniques.
Innovation Solution
A power assembly with a silencing cavity and perforated plate structure that combines axial and radial silencing to eliminate noise within specific frequency ranges, along with a drainage path for water vapor separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional vibration reduction and sound absorption methods are used, then some noise reduction is achieved, but sharp noise remains and user experience is affected
Solution Approach 1:
The silencing cavity is divided into multiple sections with different depth characteristics: an axial depth component (20-120mm) for eliminating lower frequency noise (500-3200 Hz) and a radial depth component for eliminating higher frequency noise (3000-8000 Hz). This segmentation allows each section to target specific frequency ranges, effectively resolving the limitation of conventional single-structure silencing methods that cannot address both low and high frequency noise simultaneously.
2Object-affected harmful factors
If a silencing cavity with axial depth of at least 20 mm but not more than 120 mm is used, then noise within the second frequency range (500-3200 Hz) is eliminated, but the device size increases
Solution Approach 1:
The silencing cavity utilizes both axial and radial dimensions to achieve comprehensive noise reduction. By configuring specific axial depth (20-120mm) and radial depth, the structure eliminates noise across two distinct frequency ranges simultaneously. This multi-dimensional approach maximizes noise reduction effectiveness while controlling the overall volume increase of the power assembly.
3Duration of action of stationary object
If water vapor is not separated from airflow, then the structure remains simple, but water vapor accumulation affects device service life
Solution Approach 1:
The silencing cavity serves dual functions: it acts as a noise reduction structure through its axial and radial depth configuration, and simultaneously functions as a water vapor separation structure. The cavity's design allows condensed water to collect and drain through a water outlet while maintaining its noise elimination capabilities. This multi-functionality extends device service life by preventing water accumulation without significantly increasing structural 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
Effectively reduces noise across a wide frequency range (500-8000 Hz) and separates water vapor from airflow, enhancing user experience and extending the service life of the device.
Implementation Method 1
a silencing cavity, arranged around the power source, the silencing cavity having an axial depth and a radial depth, wherein the radial depth is configured to eliminate noise within a first frequency range, and the axial depth is configured to eliminate noise within a second frequency range
Implementation Method 2
water vapor in a working airflow condenses into liquid on the perforated plate and/or the outer wall
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Disclosed are a power assembly (100) and a surface-cleaning device. The power assembly (100) comprises: a power source (20) configured to provide fluid power; and a silencing cavity (34) arranged around the power source (20) and provided with an axial depth and a radial depth. The radial depth is configured for silencing in a first frequency range, and the axial depth is configured for silencing in a second frequency range; the axial depth is at least 20 mm but not greater than 120 mm.