Differential Pressure Sensor Flexible Washer Overpressure Safety
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Solution Overview
Problem
Existing pressure sensors face issues with resistance to overpressure, sensitivity to reference temperature and pressure, and reliability due to the use of inelastic parts and potential leaks in overpressure safety devices, which hinder miniaturization and accuracy.
Innovation Solution
A pressure sensor design featuring a central member with concentric flexible washers that provide sealing contact when pressure differences exceed a threshold, ensuring reversible deformation and maintaining sensor reliability during overpressure events, while allowing for miniaturization and effective sealing between chambers with different pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If transmission rods with stops are used to limit movement during overpressure, then the measuring rod bending is limited, but the membrane deforms by swelling towards the outside of the cavity causing damage
Solution Approach 1:
A compressible element is introduced as an intermediary between the membrane and the transmission rod. This mediator absorbs the overpressure by compressing, preventing the membrane from deforming and swelling outward while still allowing the transmission rod to function properly during normal operation.
Solution Approach 2:
The compressible element is pre-installed in the assembly to provide cushioning protection before overpressure events occur. It is designed to compress specifically under overpressure conditions, protecting the membrane from damage while maintaining normal sensor functionality.
2Strength
If inelastic parts are used in overpressure safety devices, then overpressure protection is provided, but the sensor reliability is reduced and miniaturization is hindered
Solution Approach 1:
The invention uses a compressible element that functions as a flexible protective component rather than rigid inelastic parts. This flexible approach enables miniaturization while maintaining overpressure protection, as the compressible element can be integrated into compact sensor designs without requiring large inelastic safety components.
3Adaptability or versatility
If the sensor is designed to be bidirectional, then it can measure pressure difference in both directions, but it becomes more sensitive to reference temperature and pressure
Solution Approach 1:
The compressible element is strategically placed in the pressure pathway to provide localized compensation. By positioning the compression element specifically to counteract reference pressure effects, the sensor maintains bidirectional capability while reducing sensitivity to reference temperature and pressure variations.
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 flexible washer-based overpressure safety device enhances the sensor's reliability, maintains accuracy, and facilitates miniaturization by ensuring reversible deformation and effective sealing, addressing the limitations of existing technologies.
Implementation Method 1
the washer is in sealing contact with the lower face or the upper face when the pressure difference between a first pressure exerted on the first membrane and a second pressure exerted on the second membrane exceeds a threshold value
Implementation Method 2
the second pressure P2 applied to the second membrane 20b is transferred to the first membrane 20a via the liquid filling the pressure sensor 10
Implementation Method 3
The measurement of the deformation of the measuring body 30 by the strain gauge 31 makes it possible to measure the force applied to said measuring body 30
Data Source
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AI summary
The invention relates to a pressure sensor (10a; 10b; 10c) comprising a central member (50) along a first axis (β) which includes at least one concentric flexible washer (521) extending from the central member to a free flexible terminal portion (521b), the sensor further comprising a stop (610) having an upper face (611) and a lower face (612) concentric around the first axis such that the washer is in tight contact with the lower face or the upper face when the pressure difference between a first pressure (P1) exerted on the first diaphragm and a second pressure (P2) exerted on the second diaphragm exceeds a threshold value.