Fluid-Filled Pressure Sensor Assembly High-Pressure Sealing
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Solution Overview
Problem
Conventional fluid-filled pressure sensor assemblies fail to effectively operate in high-pressure environments due to pressure transfer issues that can cause oil leaks or bursting in the oil fill tube and sealing elements, leading to improper pressure measurement.
Innovation Solution
A fluid-filled pressure sensor assembly is designed with a diaphragm and sealing element positioned forward of the mating surface, where both are exposed to the pressure media, allowing the fluid in the cavity to transfer pressure equivalently to both the pressure sensor and the sealing element, thereby reducing the risk of failure under high pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the oil fill tube and sealing element are positioned at the back of the header, then the assembly structure is simplified, but the sealing element and oil fill tube are subjected to excessive pressure stress causing leakage or bursting in high-pressure environments
Solution Approach 1:
The sealing element is repositioned from the back of the header to the front of the header, changing its spatial dimension relative to the pressure sensor chip. This dimensional change allows the sealing element to be positioned in a location where it can withstand high pressure without compromising the simplified assembly structure, thereby resolving the contradiction between structural simplicity and sealing reliability in high-pressure environments.
2Ease of manufacture
If the sealing element is positioned at the back of the header, then the manufacturing process is simplified, but the sealing element cannot withstand high pressure without leaking or bursting
Solution Approach 1:
The sealing element is repositioned from the back of the header to the front of the header, changing its spatial dimension. This allows the sealing element to be positioned in a location where it can withstand high pressure while maintaining ease of manufacture, as the new position allows the sealing element to be installed in the same manufacturing step without adding complexity to the manufacturing process.
3Reliability
If the sealing element is positioned forward of the mating surface, then the sealing element can withstand high pressure, but the assembly structure becomes more complex
Solution Approach 1:
The front of the header is designed to serve multiple functions: it acts as both the mounting location for the pressure sensor chip and the positioning location for the sealing element. This multi-functional design allows the sealing element to be positioned forward of the mating surface to withstand high pressure without adding separate structural components, thereby maintaining assembly simplicity while improving sealing reliability.
4Reliability
If the sealing element is positioned forward of the mating surface, then the sealing element can withstand high pressure, but the manufacturing process becomes more complex
Solution Approach 1:
The sealing element is pre-positioned on the front of the header during the assembly process, before the final mating connection is made. This preliminary positioning allows the sealing element to be installed in the same manufacturing step as other components, without requiring additional manufacturing steps or complex assembly procedures, thereby maintaining ease of manufacture while improving sealing reliability for high-pressure applications.
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 configuration enables the pressure sensor assembly to operate reliably in higher pressure environments by ensuring equivalent pressure transfer to both the pressure sensor and the sealing element, minimizing the likelihood of leakage or failure.
Implementation Method 1
a first pressure applied at the diaphragm may be transferred by a fluid in the fluid region to the pressure sensor for measurement thereof
Data Source
AI summary
This disclosure provides systems and methods for a fluid-filled pressure sensor assembly for higher pressure environments. A fluid-filled pressure sensor assembly may be adapted for coupling to a structure at a mating surface and may include a header; a pressure sensor coupled to the header; a diaphragm coupled to the header and configured for positioning forward of the mating surface so that a fluid region is disposed between the diaphragm and the pressure sensor; a fill hole coupled to the fluid region; a sealing element coupled to the fill hole and configured for positioning forward of the mating surface; and wherein during operation the first pressure applied at the diaphragm is substantially transferred by the fluid in the fluid region and the fill hole to an inner-side of the sealing element and the first pressure is about equivalent to a second pressure applied at an outer-side of the sealing element.