Capacitor Pressure Relief Valve with Guide Surface
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Solution Overview
Problem
Aluminum electrolytic capacitors deteriorate and experience slurry explosions when used in high-temperature environments due to internal gas pressure buildup, leading to shortened lifespan and safety risks.
Innovation Solution
A pressure relief valve with a movable blocking cover and guide surface is integrated into the electrolytic capacitor to manage internal gas pressure, ensuring it remains within a safe range and facilitating effective heat dissipation, while a resetting mechanism automatically closes the valve to prevent premature opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the internal gas pressure of the electrolytic capacitor is not controlled in high-temperature environments, then the capacitor can maintain its structural integrity, but the internal gas pressure rises sharply causing premature valve opening, shortened lifespan, and potential slurry explosion
Solution Approach 1:
The pressure relief valve is pre-configured with a blocking cover that remains closed under normal conditions but automatically opens when internal gas pressure exceeds a predetermined threshold. This preliminary action mechanism prevents catastrophic failure by proactively releasing pressure before it reaches dangerous levels, thereby extending capacitor lifespan and ensuring safety in high-temperature environments
Solution Approach 2:
The pressure relief valve operates on a feedback principle where the blocking cover responds to changes in internal gas pressure. When pressure rises above the safe range, the force balance on the blocking cover changes, causing it to open and release gas. When pressure returns to the safe range, the blocking cover closes automatically. This continuous feedback loop maintains internal gas pressure within safe limits, preventing premature valve opening and slurry explosion
2Stress or pressure
If the pressure relief valve opens frequently to release gas, then internal gas pressure is reduced, but heat dissipation efficiency deteriorates due to separation between the core package and bottom
Solution Approach 1:
The pressure relief valve is designed with a specific opening pressure threshold that is set higher than normal operating pressure but below dangerous levels. By changing the pressure parameter at which the valve opens, the system maintains core package contact with the bottom for effective heat dissipation while still providing pressure relief when necessary. The valve only opens when pressure exceeds this optimized threshold, minimizing interruptions to heat dissipation
3Device complexity
If no pressure relief mechanism is provided, then the capacitor structure remains simple, but gas production from solvent volatilization and water vapor causes bulging and potential slurry explosion
Solution Approach 1:
The pressure relief valve extracts the harmful function of pressure accumulation by providing a controlled release mechanism. The blocking cover is designed to open at a predetermined pressure threshold, extracting excess gas from the capacitor before it can cause bulging or slurry explosion. This separation of the pressure containment function from the overall capacitor structure allows the rest of the device to remain simple while effectively managing gas production from solvent volatilization and water vapor
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 solution effectively reduces the risk of premature valve opening and slurry explosions, extending the lifespan of the capacitor and ensuring safe operation under high temperatures by maintaining controlled internal pressure and guiding gas discharge.
Implementation Method 1
at least a part of the bottom wall of the blocking cover forms a guide surface, and the guide surface extends from the center of the blocking cover radially outward and upward obliquely, the guide surface extends to the radial edge of the blocking cover
Implementation Method 2
The pressure relief valve also comprises a resetting member, the resetting member is placed on the valve seat and is used to drive the blocking cover to the closed position when the blocking cover is in the open position
Data Source
AI summary
A pressure relief valve and an electrolytic capacitor, including: a valve seat, wherein an exhaust passage is formed, an installation groove arranged on the top which communicates with the passage; a blocking cover, movably arranged on the groove between an open and a closed position for opening and closing the passage, a sealing ring arranged between the bottom of the cover and the groove, wherein at least part of the bottom wall forms a guide surface, which extends from the center of the cover radially outward and upward obliquely to the radial edge. The valve can be suitable for the installation of the capacitor to reduce the internal gas pressure therein, maintain the internal gas pressure within a safe range, and at the same time reduce the bulging of the bottom of the capacitor, so that the core package and the bottom are closely attached to achieve effective heat dissipation.