Gas Pressure Spring Tapered Burst Zone for Controlled Overpressure Relief
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Solution Overview
Problem
Existing gas pressure springs face challenges with overpressure protection mechanisms that are either costly or have fixed positions and dimensions, leading to suboptimal adaptation and work hardening issues, which can result in uncontrolled fluid release during high temperatures.
Innovation Solution
A gas pressure spring with a localized taper on the pressure tube forms a predetermined breaking point that allows controlled fluid release when pressure exceeds a limit, featuring a monotonically increasing wall thickness from a minimum to an edge, facilitating easy production and reducing the risk of uncontrolled bursting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a damping groove is used as a predetermined breaking line, then the jacket wall can tear open in the event of fire, but the groove extends over a large part of the length and cannot be optimally adapted to overpressure protection requirements, and work hardening occurs during groove embossing
Solution Approach 1:
The patent applies local quality by creating a localized taper (material removal) at a specific position on the pressure tube wall rather than using an extended damping groove. This localized modification allows the wall to be precisely adapted for overpressure protection at the critical location while maintaining full strength elsewhere, avoiding the work hardening issues associated with extensive groove embossing.
2Reliability
If overpressure valves are used for overpressure protection, then reliable pressure relief is achieved, but manufacturing costs are high
Solution Approach 1:
The patent implements self-service by designing the pressure tube wall itself to serve as the overpressure protection mechanism through the localized taper. The wall structure automatically responds to overpressure conditions by tearing open at the predetermined location, eliminating the need for separate overpressure valve components and their associated high manufacturing costs.
3Reliability
If a localized taper with monotonically increasing wall thickness is created, then controlled fluid release is achieved with reduced risk of uncontrolled bursting, but material removal is required
Solution Approach 1:
The patent applies preliminary action by pre-creating the localized taper with monotonically increasing wall thickness during the manufacturing process. This preliminary structural preparation ensures that when overpressure occurs, the fluid release is controlled and predictable, as the wall is pre-conditioned to fail in a controlled manner rather than catastrophically.
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 provides reliable and cost-effective overpressure protection with controlled fluid release, minimizing the risk of uncontrolled bursting and reducing manufacturing complexity, while maintaining operational integrity.
Implementation Method 1
when the fluid pressure exceeds a limit pressure. When the fluid pressure exceeds the limit pressure, the pressure tube bursts open at the predetermined breaking point formed by the taper, allowing a portion of the fluid to escape from the pressure tube to reduce the fluid pressure
Data Source
AI summary
A gas pressure spring is provided including a pressure tube and a fluid with a fluid pressure enclosed by the pressure tube in a fluid-tight manner in an operating state of the gas pressure spring. A wall of the pressure tube has a local taper, the taper forming a predetermined breaking point of the wall adapted to open to release a portion of the fluid from the pressure tube in a controlled manner when the fluid pressure exceeds a limit pressure. A wall thickness of the wall has a line-shaped minimum within the taper, the wall thickness increasing monotonically from the minimum to an edge of the taper in all circumferential directions around a longitudinal axis of the pressure tube. Also provided is a method of manufacturing the gas pressure spring.