Fan Backflow Prevention Structure With Rotating Static Blade Assembly
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Solution Overview
Problem
Conventional fan backflow prevention structures increase manufacturing costs and prolong working time while reducing heat dissipation efficiency due to external devices that alter airflow and pressure, and allow air to flow back to the inlet.
Innovation Solution
A fan backflow prevention structure with a frame body, first static blade assembly, and second static blade assembly, where the second static blade assembly rotates to misalign and block air backflow when a fan fails, eliminating the need for additional prevention devices and enhancing heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external backflow prevention device is added to the fan, then air backflow is prevented, but the manufacturing cost increases and working time is prolonged
Solution Approach 1:
The backflow prevention function is merged with the fan's existing blade structure. The second static blade assembly is integrated into the fan frame body, combining the fan's air-moving function with backflow prevention in a single integrated structure, eliminating the need for separate external backflow prevention devices
Solution Approach 2:
The second static blade assembly serves multiple functions: it acts as both a fan blade for normal operation and a backflow prevention mechanism when the fan fails. This multi-functional design allows the same structure to perform different roles based on operational conditions
2Reliability
If an external backflow prevention device is added to the fan, then air backflow is prevented, but the device complexity increases
Solution Approach 1:
The backflow prevention structure is merged with the fan's blade assembly, using the same structural elements (frame body, static blade assemblies) to achieve both fan operation and backflow prevention functions without adding separate complex mechanisms
Solution Approach 2:
Instead of adding a separate backflow prevention device that operates independently, the invention inverts the approach by making the fan's own blade structure perform the backflow prevention function through its geometric arrangement and rotational behavior
3Reliability
If the second static blade assembly is disposed at the air outlet, then backflow prevention is achieved, but the air outgoing area is reduced
Solution Approach 1:
The second static blade assembly's effective position changes dynamically based on fan operation. During normal operation, it is rotated out of the air outlet by the rotating blades. During backflow prevention, it remains at the air outlet to block reverse airflow, thus not permanently reducing the air outgoing area
Solution Approach 2:
The solution moves the backflow prevention mechanism from a spatial occupation problem to a temporal/operational problem. The second static blade assembly is positioned at the air outlet but uses rotational movement in another dimension (angular position) to avoid blocking the air outlet during normal operation while blocking it during backflow conditions
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
Prevents air backflow to the inlet, enhances heat dissipation efficiency, and significantly reduces manufacturing costs and working time by integrating the backflow prevention mechanism into the fan design.
Implementation Method 1
the second static blade assembly mounted on the fan frame body will rotate through an angle to become misaligned from the first static blade assembly. Under such circumstance, the stop sections are correspondingly positioned in the flow ways formed between the static blade sections so as to block backflow of the air at the air outlet
Data Source
AI summary
A fan backflow prevention structure includes a frame body, a first static blade assembly and a second static blade assembly. The frame body has a peripheral wall. Two end edges of the peripheral wall are respectively formed as an air inlet and as an air outlet. A base seat is correspondingly disposed at the air outlet. The first static blade assembly extends outward from the base seat and includes multiple static blade sections. Two ends of each static blade section are respectively connected with the base seat and the peripheral wall. The second static blade assembly is disposed at the air outlet and rotatably coupled to the base seat. The second static blade assembly has a connecting section and multiple stop sections extending outward from the connecting section.