Spring-Suspended Vacuum Cleaner Motor for Vibration Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vacuum cleaners fail to effectively isolate motor vibrations, leading to transmission of dynamic forces and vibrations to the housing due to high damping in rubber mounting packing, resulting in vibration noise.
Innovation Solution
The motor is suspended using a low-damped suspension system with springs, where the natural frequency is at least three times lower than the excitation frequency, and the springs have a stiffness at least ten times higher than the flexible air guide, ensuring minimal vibration transmission and effective isolation in all six degrees of freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If rubber mounting packing is used to suspend the motor, then the motor is isolated from the housing, but the high damping of the rubber transmits dynamic forces and vibrations to the housing
Solution Approach 1:
The patent changes the damping parameter from high (rubber mounting packing with >4% damping) to very low (springs with <1% damping). This parameter change allows the suspension system to isolate vibrations while minimizing the transmission of dynamic forces to the housing, as low-damped springs resonate less and transmit fewer force fluctuations.
Solution Approach 2:
The patent substitutes the rubber mounting packing mechanical system with a spring-based mechanical system. This replacement fundamentally changes the vibration transmission characteristics, as springs provide elastic suspension with controllable low damping, whereas rubber provides viscous damping with high energy dissipation that still transmits forces.
2Object-affected harmful factors
If the natural frequency of the suspension system is lowered, then vibration isolation is improved, but the stiffness of the suspension must be reduced
Solution Approach 1:
The patent changes two parameters simultaneously: it lowers the natural frequency (to at least 3 times below the excitation frequency) to improve vibration isolation, while maintaining sufficient suspension stiffness through the spring design. The low damping (<1%) compensates for the reduced stiffness, ensuring that the motor remains securely suspended while isolating vibrations effectively.
3Adaptability or versatility
If a flexible air guide is used to seal between compartments, then the motor can move with respect to the dust compartment, but the air guide may transmit vibrations
Solution Approach 1:
The patent changes the stiffness parameter of the air guide by making it flexible, with a stiffness at least ten times lower than the spring stiffness. This allows the air guide to accommodate motor movement while the low stiffness prevents it from forming an effective vibration transmission path, as flexible materials dampen high-frequency vibrations.
Solution Approach 2:
The flexible air guide acts as an intermediary element between the motor compartment and dust compartment. It provides the necessary sealing function while its flexibility allows it to decouple the vibration paths, preventing vibrations from the motor from being transmitted through the air guide to the dust compartment.
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
This approach significantly reduces dynamic forces and vibrations transmitted to the housing, achieving improved vibration isolation and reduced noise, while maintaining a leakage-free sealing between compartments.
Implementation Method 1
the natural frequency of the suspension system including the motor is at least 3 times lower than the excitation frequency of the motor whilst the spring has a damping less than 1%
Implementation Method 2
the motor is suspended in the motor compartment by a suspension system comprising at least one spring
Implementation Method 3
the air guide is a flexible air guide comprising a first ring-shaped element connected to a separation wall between the dust compartment and the motor compartment
Data Source
AI summary
A vacuum cleaner (1) comprising a housing (2) being separated in at least a dust compartment (4) and a motor compartment (6). The vacuum cleaner (1) also comprises a motor (7) located in the motor compartment (6) and an air guide (8) between the dust compartment (4) and the motor (7). The motor (7) is suspended in the motor compartment (6) by a suspension system comprising at least one spring (23).