Magnetic Buffer Structure for Heat Dissipating Fan Bearings
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Solution Overview
Problem
Heat dissipating fans lack an effective buffer structure to prevent damage to bearings from accidental forces, particularly upward forces, which can cause bearing damage.
Innovation Solution
A buffer structure comprising a pair of magnets positioned between the bearings and a protrusion within the housing, generating a repellent force to absorb and counteract accidental forces, and a coil spring or alternative resilient members to manage downward forces, ensuring the bearings remain undamaged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bearing is fixedly mounted at the bottom section of the tube without a buffer structure, then the structure is simple and easy to manufacture, but the bearing will be damaged when the rotor undergoes an upward force
Solution Approach 1:
The patent introduces a buffer structure comprising a resilient member (such as a spring) and a magnet positioned between the rotor and the bearing. This buffer structure is pre-installed to cushion and absorb accidental upward forces before they reach the bearing, preventing bearing damage in advance while maintaining relative structural simplicity.
Solution Approach 2:
The patent uses a magnet as an intermediary element positioned between the rotor and the bearing. The magnet generates magnetic repulsion force that acts as a mediator to counteract upward forces on the rotor, protecting the bearing from direct impact while adding minimal structural complexity.
2Reliability
If a buffer structure with magnets is added to prevent bearing damage, then the reliability improves, but the device complexity increases
Solution Approach 1:
The patent replaces part of the mechanical buffer system with a magnetic field-based solution. Instead of using only mechanical springs or shock absorbers, a magnet is introduced to generate magnetic repulsion force that counteracts upward forces, reducing the need for complex mechanical buffer structures while improving reliability.
Solution Approach 2:
The patent utilizes magnetic field parameters (magnetic strength, polarity arrangement) to create a non-contact protective force. By adjusting magnetic parameters rather than increasing mechanical component complexity, the system achieves better bearing protection with minimal added 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
The buffer structure effectively absorbs and returns to its original position after accidental forces, preventing bearing damage and maintaining the operational integrity of the heat dissipating fan.
Implementation Method 1
Repellent force is generated between the magnets, thereby preventing at least one of the first and the second bearing from being damaged by an accidental force acting thereon
Data Source
AI summary
A heat dissipating fan includes a housing (201), a stator (21), a rotor (27) and a buffer structure. The housing defines an accommodating space (202) and includes a hollow tube (201b). The tube encloses first and second bearings (22, 23) therein. The stator is arranged in the accommodating space and around the tube. The rotor has a shaft rotatably disposed in the first and the second bearings. The buffer structure includes at least a pair of magnets (25, 26) received in the tube and located between the first and second bearings. Repellent force is generated between the magnets, thereby preventing at least one of the first and the second bearing from being damaged by an accidental force acting thereon.