Blower Unit Multi-Plastic Housing Design to Reduce Rotation Noise
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Blower units, such as vacuum cleaners, generate significant noise due to rotating sound caused by interactions between static and rotating components, which is difficult to reduce without compromising efficiency or increasing material costs and assembly complexity.
Innovation Solution
A blower unit design featuring a blower rotor, cover, and diffuser where the cover and diffuser are made from different plastics, forming a common flow housing, allowing direct contact without damping materials, effectively decoupling vibrations and reducing rotating sound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If damping or elastic material is arranged between the blower cover and guide device to decouple vibrations, then rotary noise is reduced, but material costs and assembly effort increase
Solution Approach 1:
The patent changes the material parameter by using different plastics for the blower cover and guide device, creating inherent vibration decoupling through material property differences rather than adding damping materials. This resolves the contradiction by achieving noise reduction without increasing assembly complexity.
2Object-generated harmful factors
If damping or elastic material is used to decouple the blower cover from the guide device, then vibration transmission is reduced, but the gap between rotor and housing increases causing efficiency loss
Solution Approach 1:
The patent uses different plastic materials with different thermal expansion coefficients and mechanical properties for the blower cover and guide device. This allows the components to be connected with minimal gap while inherently decoupling vibrations through material property differences, thus maintaining blower efficiency while reducing vibration transmission.
3Object-generated harmful factors
If damping or elastic material is arranged between components to reduce noise, then vibration decoupling is achieved, but material costs increase
Solution Approach 1:
The patent changes the material parameter by selecting different plastics for the blower cover and guide device, creating inherent vibration decoupling through material property differences. This eliminates the need for additional damping materials, thus reducing noise without increasing material costs.
4Productivity
If the gap between rotor and housing is minimized for efficiency, then aerodynamic losses are reduced, but vibration coupling between components increases
Solution Approach 1:
The patent uses different plastic materials for the blower cover and guide device, which creates inherent vibration decoupling through material property differences. This allows the components to be positioned close to each other for aerodynamic efficiency while the material differences prevent vibration coupling.
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 design reduces noise emissions by decoupling vibrations between the blower cover and diffuser, maintaining efficiency, and eliminating the need for damping materials, thus being cost-effective and reliable.
Implementation Method 1
the blower cover is formed at least in sections from a first plastic and the guide device is formed at least in sections from a second plastic which is different from the first
Data Source
Figure 1~2
AI summary
The invention relates to a blower unit (1), in particular for use in a vacuum cleaner (50), comprising a blower rotor (2), a blower cover (3) and a guide apparatus (4), wherein the blower rotor (2) is rotatably arranged at least partially in the blower cover (3) by means of a motor and wherein the blower cover (3) and the guide apparatus (4) are connected to each other at least partially such that the blower cover (3) and the guide apparatus (4) form a common flow housing (6) at least partially.