Fan Module Blade Mechanism for Airflow Backflow Prevention
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Solution Overview
Problem
Hot-plugging fan modules in computers and servers face challenges in preventing airflow from flowing back into the casing when the fan stops operating or is removed, leading to potential foreign matter entry.
Innovation Solution
A fan module with a blade mechanism and switch component that allows the blades to rotate between a closed and open mode, blocking airflow when the fan is not operational to prevent backflow and foreign matter entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hot-plugging fan module is used to facilitate installation and removal, then ease of operation is improved, but airflow backflow into casing occurs when fan stops or is removed
Solution Approach 1:
The blade mechanism is designed to automatically close the vent hole before the fan is fully removed or stopped, preventing airflow backflow in advance. The blades are positioned to block the through hole when the fan module is in the removed or stopped state, eliminating the harmful backflow effect before it can occur.
Solution Approach 2:
The blade mechanism is made movable between different positions - open when the fan is operating and closed when the fan is stopped or removed. This dynamic adjustment allows the system to adapt to different operational states, maintaining protection against backflow while enabling easy hot-plugging operations.
2Productivity
If vent hole is opened for fan operation, then heat dissipation efficiency is improved, but foreign matter can enter casing when fan is not operational
Solution Approach 1:
The blade mechanism dynamically adjusts the state of the vent hole - open during fan operation for maximum heat dissipation efficiency, and closed when the fan is stopped or removed to prevent foreign matter entry. This dynamic control resolves the contradiction between maintaining open vent for cooling and closing vent for protection.
Solution Approach 2:
The blade mechanism automatically transitions between open and closed states based on the fan's operational status without requiring external control. When the fan is removed or stopped, the blades naturally close the vent hole, providing self-service protection against foreign matter while maintaining heat dissipation during operation.
3Reliability
If blade mechanism is added to prevent backflow, then reliability is improved, but device complexity increases
Solution Approach 1:
The blade mechanism operates automatically based on the fan's presence and operation without requiring external actuators, sensors, or control systems. The mechanical design allows the blades to close the vent hole automatically when the fan is removed or stopped, achieving reliable backflow prevention through self-service operation that minimizes additional complexity.
Data Source
AI summary
A fan module including a blade mechanism, a switch component, and a fan is provided. The blade mechanism includes a frame having a through hole, a positioning bracket movably connected to the frame, and blades movably connected to the positioning bracket and the frame. The switch component is connected to the positioning bracket and located on an assembly path. The fan is detachably disposed at one side of the through hole, and the positioning bracket and the blades are located at another side. In a first mode, any two adjacent blades are stacked to close the through hole. In a second mode, the fan pushes the switch component to drive the positioning bracket to drive the blades, such that the blades have a rotational degree of freedom relative to the positioning bracket or rotate relative to the frame to open the through hole. An electronic device is also provided.