Aluminum Electrolytic Capacitor Vacuum Sealing With Multi-Stage Pressing
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Solution Overview
Problem
Conventional packaging methods for aluminum electrolytic capacitors result in a shorter service life due to inadequate airtightness and friction-induced heat generation, leading to seal shrinkage and reduced structure integrity.
Innovation Solution
A packaging method involving an accommodating mechanism with multiple pressing stages to position the seal at various depths within the case, reducing the sliding distance and friction, and maintaining a negative pressure state to prevent seal melting and ensure airtightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the seal is directly slid to the opening of the case in one time, then the packaging process is simple and fast, but the seal experiences long sliding distance causing friction heat generation, seal melting, shrinkage, and reduced airtightness
Solution Approach 1:
The packaging process is segmented into multiple pressing stages. The seal is pressed into the case opening in multiple steps rather than one continuous motion, with each stage pressing the seal to a specific depth (first depth, second depth closer to bottom, third depth even closer to bottom). This segmentation reduces the sliding distance at each stage, minimizing friction heat generation and seal shrinkage while maintaining packaging efficiency.
2Reliability
If the seal is pressed deeply into the case opening to ensure airtightness, then the sealing reliability improves, but the friction force and heat generation increase, causing seal damage
Solution Approach 1:
The accommodating mechanism is vacuumized before the seal pressing operation begins, creating a negative pressure state. This preliminary action reduces the friction between the seal and case inner wall during the pressing process, allowing the seal to be pressed to the required depth with reduced heat generation and minimal seal damage.
3Object-affected harmful factors
If the accommodating mechanism is vacuumized before pressing, then the friction between seal and case is reduced, but the process complexity increases
Solution Approach 1:
The vacuumizing function and the multi-stage pressing operation are merged into a single integrated accommodating mechanism. The mechanism performs both vacuum creation and controlled multi-stage pressing in one device, reducing overall process complexity compared to separate vacuum and pressing operations while effectively reducing friction during seal installation.
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
This method enhances the airtight seal reliability and extends the service life of aluminum electrolytic capacitors by minimizing friction heat and maintaining the electrolyte mass within the capacitor.
Implementation Method 1
vacuumizing the accommodating mechanism to allow the inner chamber to be in a negative pressure state
Data Source
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AI summary
A negative-pressure packaging method for aluminum electrolytic capacitors including: penetratedly arranging a capacitor element in a seal; placing the capacitor element, the seal and a case at an inner chamber of an accommodating mechanism; sealing the accommodating mechanism; vacuumizing the accommodating mechanism to allow the inner chamber to be in a negative pressure state; subjecting the seal and the case to packaging, such that the seal is located at a first depth of the case; and subjecting the seal and the case to pressing, such that the seal is located at a second depth of the case, where the second depth is closer to a bottom of the case with respect to the first depth. The defect in the prior art that the sliding distance of the seal on the inner wall of the case is too long is overcome, reducing the generation of friction heat, and preventing the melting of the seal. Therefore, the packaging method provided herein can ensure a reliable air tight seal between the seal and the case, improving the product stability and service life.