Pressure Sensor Positive-Lock Seal for Easier Assembly
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Solution Overview
Problem
Existing pressure sensors for measuring fluid medium pressure in combustion chambers face issues such as damage to seals during assembly and disassembly, risk of hydrogen embrittlement, and whistle vibrations that distort measurement signals, while being costly and difficult to mount and dismount.
Innovation Solution
A pressure sensor design with a permanently held sealing element that forms a positive connection with the sensor device, allowing easy assembly and disassembly, and features a membrane located at the front to eliminate whistle vibrations, with seals that adapt to the mounting surfaces through deformation, and a weld seam positioned away from the fluid medium to prevent hydrogen embrittlement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pressure sensor is mounted and dismounted repeatedly using a tool on the hollow mounting screw, then the pressure sensor can be installed and removed, but the sealing surfaces are damaged due to excessive clamping forces from tool jamming
Solution Approach 1:
A tool receiving element (e.g., a socket or recess) is integrated into the hollow mounting screw to receive the assembly tool. This intermediary structure ensures proper tool alignment and prevents tool jamming, thereby avoiding excessive clamping forces that would damage the sealing surfaces while still enabling easy assembly and disassembly operations.
2Temperature
If the sensor element is located at the second end of the channel away from the combustion chamber, then the sensor element is protected from high temperatures, but the sealing surface located at the first end generates whistle vibrations that distort measurement signals
Solution Approach 1:
The sealing element is extracted from the traditional sealing surface configuration and replaced with a deformable sealing element that adapts to the mounting surface. This deformable sealing element eliminates the rigid structure that generates whistle vibrations, thereby improving measurement precision while the sensor element remains positioned at the second end for thermal protection.
3Productivity
If the metallic components are in direct contact with hydrogen-containing fluid medium, then the pressure sensor can measure the pressure, but hydrogen embrittlement occurs causing cracking and failure
Solution Approach 1:
The sealing element is made from a material that is resistant to hydrogen embrittlement, such as an elastomer or polymer composite, rather than traditional metallic materials. This composite material maintains the pressure sealing capability while preventing hydrogen penetration and embrittlement, thereby improving reliability without sacrificing pressure measurement functionality.
4Stability of the object's composition
If the sealing element surfaces are made rigid for stable sealing, then the sealing is initially effective, but the seals cannot adapt to mounting surface variations and are easily damaged during assembly
Solution Approach 1:
The sealing element is designed with deformable properties, allowing it to change its physical parameters (shape and conformability) during assembly. This deformable characteristic enables the sealing element to adapt to variations in mounting surface geometry, improving ease of manufacture and assembly tolerance while maintaining stable sealing through the deformable material's ability to conform and seal effectively.
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 ensures durable, cost-effective operation with consistent seal quality, reduced risk of seal damage, and improved resistance to hydrogen embrittlement, while eliminating whistle vibrations and simplifying installation and removal processes.
Implementation Method 1
seals that adapt to the mounting surfaces through deformation
Implementation Method 2
Under the influence of the pressure of the fluid medium, the membrane deforms, and this strain gauge generates a measurement signal for the pressure-dependent deformation of the membrane
Implementation Method 3
The sensor element is a strain gauge. Under the influence of the pressure of the fluid medium, the membrane deforms, and this strain gauge generates a measurement signal
Data Source
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AI summary
The invention relates to a pressure sensor (1) for measuring the pressure (P) of a fluid medium (M); which pressure sensor (1) comprises a mounting device (2), a sensor device (3) and a sealing element (5), which mounting device (2) holds the sensor device (3) and which mounting device (2) can be mounted in a mounting bore (100) of a wall (11); which sensor device (3) comprises a diaphragm (31) and a sensor element (33), which fluid medium (M) is in direct contact with the diaphragm (31) of the pressure sensor (1) mounted in the mounting bore (100) via the mounting bore (100) and which pressure (P) acts on the sensor element (33) via the diaphragm (31) of the pressure sensor (1) mounted in the mounting bore (100), which sensor element (33) generates a measurement signal for a pressure-dependent deformation of the diaphragm (31);which sealing element (5) of the pressure sensor (1) mounted in the mounting bore (100) seals the mounting bore (100) with a sensor device surface (32) of the sensor device (3) in a first seal (5') and which sealing element (5) of the pressure sensor (1) mounted in the mounting bore (100) seals the mounting bore (100) with a wall surface (106) of the wall (11) in a second seal (5"); wherein the sealing element (5) has a pin (54); wherein the sensor device (3) has a socket (34); and wherein the socket (34) permanently holds the pin (54) by positive locking.