Fluid Testing Device for Dissolved Gas Measurement
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Solution Overview
Problem
Current methods lack a reliable procedure for determining the degree of dissolved gases removal from pressurized hydraulic fluids, as dissolved gases are not visually detectable and can only be separated under specific temperature and pressure changes, affecting hydraulic system performance.
Innovation Solution
A fluid testing device with a first and second tank, where the second tank is larger, allows for the introduction of a pressurized fluid, evacuation to create a vacuum, and a pre-defined out-gassing period to separate dissolved and entrained gases, enabling the measurement of gas release through absolute pressure sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dissolved gases are tested in pressurized fluid at delivery conditions, then the gas content can be determined accurately, but the gases remain in dissolved state and are not visually detectable
Solution Approach 1:
The patent changes the pressure parameter from pressurized (delivery conditions) to vacuum conditions, causing dissolved gases to separate from the liquid phase and become visually detectable as bubbles, while still allowing quantitative measurement through pressure differential analysis
Solution Approach 2:
The patent induces a phase transition of gases from dissolved state in pressurized fluid to separated gas bubbles in vacuum conditions, enabling both visual detection and quantitative measurement through the phase change process
2Measurement precision
If equilibrium reflux boiling point test is used to measure water removal, then water content can be determined, but no similar test procedure exists for determining gas removal degree
Solution Approach 1:
The patent performs preliminary evacuation of the testing chambers to vacuum conditions before introducing the pressurized fluid, creating the necessary vacuum environment in advance to enable gas separation and measurement
Solution Approach 2:
The patent replaces the need for complex chemical analysis or specialized test procedures with a straightforward vacuum evacuation and pressure differential measurement system, simplifying the test methodology
3Difficulty of detecting and measuring
If entrained gases are detected through density variation or visual inspection, then gas bubbles can be identified, but dissolved gases cannot be detected and may cause performance issues
Solution Approach 1:
The patent changes the pressure parameter to vacuum conditions, causing dissolved gases to separate from the liquid phase and become visually detectable as bubbles, while still allowing quantitative measurement through pressure differential analysis
Solution Approach 2:
The patent uses vacuum as an intermediary condition that facilitates the separation of dissolved gases from the hydraulic fluid, making them detectable without directly observing them in the pressurized state
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
Enables the determination of dissolved gas content in pressurized fluids, aiding in fluid processing evaluation and quality control, ensuring optimal hydraulic system performance by quantifying gas removal efficiency.
Implementation Method 1
evacuating both the first tank and the second tank with the evacuation and fluid filling system to form a vacuum in both the first tank and the second tank
Implementation Method 2
a test volume of a pressurized fluid is introduced into the first tank... Fluid communication between the first tank and the second tank is then opened, to allow the test volume of the pressurized fluid to flow from the first tank into the second tank, and de-pressurize the fluid
Data Source
AI summary
A method of testing a pressurized liquid fluid for dissolved gasses includes evacuating both a first tank and a second tank. A test volume of a pressurized liquid fluid is introduced into the first tank. An initial absolute pressure in the second tank is sensed, and then fluid communication between the first tank and the second tank is opened to allow the pressurized fluid to flow from the first tank into the second tank, thereby de-pressurizing the fluid. The de-pressurized fluid in the second tank is maintained for a pre-defined out-gassing period, to allow any gasses in the de-pressurized fluid to separate from the de-pressurized fluid. A final absolute pressure in the second tank is sensed. A difference between the final absolute pressure and the initial absolute pressure is correlated to a volume of gasses released from the de-pressurized fluid.