Series-Connected Fan Circuit Board Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional series-connected fan units face difficulties in securely positioning circuit boards due to incorrect design heights, leading to potential damage and loosening during assembly, as the circuit board holder either over-abuts or fails to abut the boards effectively.
Innovation Solution
The series-connected fan unit employs first and second fan frames with positioning members and insulation areas to securely position and separate circuit boards, using coupling portions and buffering members to prevent over-abutting and ensure stable assembly, while maintaining insulation to avoid short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the circuit board holder has a predetermined height H designed to be substantially equal to the distance D between circuit boards, then the supporters can securely abut against the circuit boards, but if the height H is accidentally designed larger than intended or fans are connected too closely, the holder will over-abut and damage the circuit boards
Solution Approach 1:
The patent introduces a buffering member positioned between the supporter and the circuit board. This buffering member provides prior cushioning that prevents over-abutting damage while still allowing secure positioning. When the holder compresses the buffering member, it absorbs excess force and prevents direct damage to the circuit board, solving the contradiction between secure positioning and damage prevention.
2Reliability
If the predetermined height H of the circuit board holder is designed smaller than intended or fans are not connected closely enough, then the holder cannot reach and abut against the circuit boards, causing shaking and loosening
Solution Approach 1:
The patent changes the physical state of the buffering member from uncompressed to compressed state based on the distance D between circuit boards. When fans are connected closely, the buffering member compresses more; when connected loosely, it compresses less. This parameter change allows the holder to adapt to different assembly tolerances and maintain stable positioning without requiring precise height design.
3Manufacturing precision
If the distance D between circuit boards varies due to assembly tolerance or design errors, then either over-abutting or failure to abut occurs, making it difficult to securely position circuit boards
Solution Approach 1:
The buffering member serves as an intermediary between the rigid supporter and the circuit board. It mediates the force transmission and isolates the circuit board from direct mechanical contact with the holder. This intermediary element absorbs distance variations and assembly tolerances, reducing the system's sensitivity to D variations while maintaining positioning accuracy.
Data Source
AI summary
A series-connected fan unit includes a first fan frame, a second fan frame, a first motor, a second motor and two impellers. The first fan frame has a first base and a first positioning member coupled with the first base. The second fan frame is connected to the first fan frame in series and has a second base and a second positioning member coupled with the second base. The first motor is disposed in the first base and has a first circuit board coupled with the first positioning member. The second motor is disposed in the second base and has a second circuit board coupled with the second positioning member. The two impellers are respectively coupled with the first motor and the second motor, and an insulation area is formed between the first circuit board and the second circuit board.