Fan Balance Ring Liquid Damping for Vibration Control
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Solution Overview
Problem
High-speed heat-dissipation fans in laptops generate excessive noise and vibration due to imbalance during acceleration and deceleration, affecting user comfort and requiring speed adjustments that further exacerbate noise and vibration issues.
Innovation Solution
A fan design incorporating a balance ring with a ring chamber filled with hydrofluoroether, which increases stability by generating a moment of inertia, reducing noise and vibration through smooth liquid flow and improved rotational stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotation speed of the fan is increased to increase heat dissipation efficiency, then heat dissipation efficiency is improved, but noise and vibration generated by the fan increases
Solution Approach 1:
The patent changes the physical state parameters of the balance ring by filling it with liquid having specific surface tension characteristics (less than 50 dyne/cm at 20°C). This parameter change allows the liquid to smoothly coat the inner wall of the balance ring during rotation, creating a damping effect that reduces vibration and noise while maintaining high-speed operation capability
Solution Approach 2:
The patent employs hydraulic principles by using liquid (with volume occupying 20-80% of the balance ring cavity) instead of traditional solid balance weights. The liquid's ability to flow and adapt to the balance ring's inner surface during rotation provides dynamic balancing and vibration damping, effectively reducing noise and vibration at high speeds
2Object-generated harmful factors
If the rotation speed of the fan is reduced to decrease noise, then noise is reduced, but heat dissipation efficiency decreases
Solution Approach 1:
The patent modifies the surface tension parameter of the balancing liquid (less than 50 dyne/cm at 20°C) to ensure it can smoothly flow and coat the balance ring inner wall even at lower rotation speeds. This allows the system to maintain effective vibration damping and balancing across a wide speed range, enabling noise reduction without significant loss of heat dissipation efficiency
3Speed
If the fan accelerates or decelerates, then responsiveness is improved, but large noise and vibration are generated due to imbalance
Solution Approach 1:
The patent transforms the static solid balance weight into a dynamic liquid-filled balance ring system. The liquid inside the balance ring can dynamically adjust its distribution during acceleration and deceleration, smoothly flowing to counterbalance inertial forces and maintain rotational balance during speed transitions, thereby reducing vibration and noise
Solution Approach 2:
The hydraulic system (liquid in balance ring) provides dynamic damping during speed changes. The liquid's flow characteristics and adaptability allow it to effectively counterbalance inertial forces during acceleration and deceleration, maintaining rotational stability and reducing harmful vibrations and noises during transient operations
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 balance ring enhances fan stability, reducing noise and vibration by allowing smooth liquid flow and increasing rotational stability, thereby improving the operational comfort of laptop fans.
Implementation Method 1
A fan design incorporating a balance ring with a ring chamber filled with hydrofluoroether, which increases stability by generating a moment of inertia
Implementation Method 2
reducing noise and vibration through smooth liquid flow and improved rotational stability
Data Source
AI summary
A fan and a balance ring for the fan are provided. The fan includes a housing, a hub disposed in the housing, blades connected to the side surface of the hub, and a balance ring connected to the hub. The balance ring includes a ring chamber and a balance liquid filled in the ring chamber. The volume of the balance liquid is less than the volume of the ring chamber.