Anti-thermal Lockdown Mechanism for Injection Valves
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional injection systems face issues with material expansion due to temperature changes, leading to potential seal rupture and leakage, which are typically addressed by adding complexity and cost with check valves that introduce additional leakage points.
Innovation Solution
An anti-thermal lockdown mechanism is implemented using a pressure compensation unit with a piston and seals to dynamically adjust the volume occupied by trapped material, maintaining pressure below a threshold and preventing seal rupture without introducing additional leakage points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If check valves are added to divert excess pressure, then pressure relief is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the pressure relief function from the dead space by providing a bypass passage that allows trapped material to be diverted away from the sealed volume. This eliminates the need for check valves while maintaining pressure relief capability.
Solution Approach 2:
The bypass passage acts as an intermediary element that mediates between the dead space and the outlet, providing a controlled path for material to escape when pressure exceeds the threshold set by the adjustable restriction.
2Stress or pressure
If check valves are added to divert excess pressure, then pressure relief is improved, but additional leakage points are introduced
Solution Approach 1:
The patent removes the check valve component entirely and replaces it with a bypass passage system that achieves pressure relief without introducing additional valves or potential leakage points.
Solution Approach 2:
The system uses the trapped material's own pressure to automatically open the bypass passage when the threshold is exceeded, eliminating the need for additional control mechanisms or valves that could leak.
3Strength
If material is trapped in dead space, then valve sealing is improved, but thermal expansion causes seal rupture
Solution Approach 1:
The patent prepares for thermal expansion by providing a pre-configured bypass passage with an adjustable restriction that allows material to escape before pressure becomes high enough to rupture seals.
Solution Approach 2:
The system changes the pressure parameter dynamically by allowing it to build up to a controlled threshold level (determined by the adjustable restriction) and then releasing it through the bypass passage, preventing dangerous pressure accumulation from thermal expansion.
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 solution effectively reduces leakage risks and maintains system accuracy by dynamically compensating for pressure changes within the dead space, eliminating the need for check valves and additional leakage points.
Implementation Method 1
If the temperature of the injection system increases, this can cause the trapped material to expand.
Implementation Method 2
The pressure compensation unit is configured to dynamically provide an additional volume for material trapped in the dead space when the trapped material expands.
Data Source
AI summary
An apparatus includes a first valve configured to selectively direct material to first and second outlets and a second valve configured to block the second outlet. The first and second valves define a dead space that has a volume between the first and second valves. The apparatus also includes a pressure compensation unit configured to dynamically provide an additional volume for material trapped in the dead space when the trapped material expands. The pressure compensation unit could include a piston configured to move within a space of the pressure compensation unit, where increased pressure in the dead space causes the trapped material to push against the piston in order to provide the additional volume for the trapped material. The pressure compensation unit could further include a spring configured to bias the piston and a seal configured to substantially prevent the trapped material from passing the piston and contacting the spring.