High Pressure Visual Indicator Diaphragm Sealing
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Solution Overview
Problem
Conventional fluid-pressure indicators are not suitable for high-pressure, closed-loop systems like hydraulic hybrid vehicle systems as they are susceptible to damage from high-pressure fluid, which can cause the diaphragm, indicator disk, and sealed envelope to be damaged due to unsealed exposure to high-pressure fluid.
Innovation Solution
A fluid-pressure indicator with a housing having a first and second region, a pressure-responsive member that moves between expanded and compressed states, and a diaphragm that deflects to prevent fluid communication between regions when pressure exceeds a threshold, ensuring the diaphragm is sealed and protected from high-pressure fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional fluid-pressure indicator uses an unsealed diaphragm exposed to high-pressure fluid, then the indicator can provide pressure indication, but the diaphragm and internal components are susceptible to damage from high-pressure fluid exposure
Solution Approach 1:
The housing is divided into a first region containing the indicator components and a second region containing the diaphragm, separated by a sealed passageway. This segmentation allows the diaphragm to be exposed to high-pressure fluid while protecting the indicator components from direct high-pressure exposure, resolving the contradiction between reliability and complexity.
Solution Approach 2:
A sealed passageway acts as an intermediary between the high-pressure fluid environment and the indicator components. The passageway allows pressure transmission to the diaphragm while preventing direct fluid contact with sensitive components, thereby improving reliability without requiring complex sealing mechanisms throughout the entire device.
2Reliability
If the diaphragm is sealed to prevent high-pressure fluid damage, then component protection is improved, but the device structure becomes more complex
Solution Approach 1:
The housing is segmented into distinct regions (first region for indicators, second region for diaphragm) connected by a sealed passageway. This segmentation provides fluid sealing capability while maintaining a relatively simple overall structure, as each region can be independently designed and assembled.
Solution Approach 2:
The diaphragm itself is a flexible thin film that serves as both the pressure-sensing element and the sealing barrier. By utilizing the diaphragm's inherent flexibility and sealing properties, the design achieves reliable fluid sealing without requiring additional complex sealing mechanisms in the housing structure.
3Measurement precision
If conventional indicators are used in high-pressure systems, then pressure indication is provided, but the indicator components suffer damage from continuous high-pressure exposure
Solution Approach 1:
The device segments the high-pressure environment from the indicator components through a sealed passageway system. The diaphragm transmits pressure information to the indicator mechanism while the seal prevents harmful high-pressure fluid from reaching and damaging the indicator components, thus maintaining measurement precision without exposure to harmful factors.
Solution Approach 2:
The sealed passageway serves as an intermediary that transmits pressure information from the high-pressure fluid to the indicator components while blocking the transmission of harmful effects. This allows accurate pressure indication to be maintained while protecting components from high-pressure fluid damage.
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 prevents damage to the indicator components by sealing the diaphragm and preventing high-pressure fluid from entering the sensor assembly, allowing the indicator to accurately indicate pressure above or below a threshold without compromising its integrity.
Implementation Method 1
A diaphragm may be movable from a relaxed state to a deflected state in response to pressure within the second region exceeding a threshold pressure
Implementation Method 2
exerts a force on the indicator disk (20) to compress the sealed envelope (26) and displace the optically dense indicator fluid (27)
Data Source
AI summary
A fluid-pressure indicator includes a housing having a first region and a second region. A pressure-responsive member is disposed in the first region and is movable between an expanded state and a compressed state. An indicator disk is viewable through the pressure-responsive member when the pressure-responsive member is in the compressed state and is obscured from view through the pressure-responsive member when the pressure-responsive member is in the expanded state. A diaphragm is movable from a relaxed state to a deflected state in response to pressure within the second region exceeding a threshold pressure and prevents fluid communication between the first region and the second region. The diaphragm additionally causes the pressure-responsive member to move from the expanded state to the compressed state when the pressure exceeds the threshold pressure.