Pressure Sensor Diaphragm Isolation for Accurate Readings
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Solution Overview
Problem
Existing pressure sensors face measurement deviation due to contact between the pressure diaphragm and support member, leading to inaccurate readings.
Innovation Solution
A pressure sensor design that isolates the elastic diaphragm from other components by using a split structure with a pressure port, pressure sensitive head, and a connection cylinder, along with a mounting seat and signal assembly, to prevent direct contact and measurement deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pressure diaphragm and support member are in contact to simplify structure, then device complexity is reduced, but measurement precision deteriorates due to measurement result deviation
Solution Approach 1:
The support member is segmented into a mounting seat and a compression cylinder, which are positioned at different axial locations relative to the pressure diaphragm. The mounting seat supports the pressure diaphragm at its proximal end, while the compression cylinder is positioned at the distal end, creating a gap between them. This segmentation prevents direct contact between the pressure diaphragm and the compression cylinder, eliminating measurement deviation while maintaining structural simplicity.
2Measurement precision
If the pressure diaphragm is isolated from other components to improve measurement precision, then measurement precision is improved, but device complexity increases due to additional isolation structures
Solution Approach 1:
The mounting seat acts as an intermediary component that supports the pressure diaphragm while preventing direct contact between the pressure diaphragm and the compression cylinder. The mounting seat includes a mounting flange that abuts against the compression cylinder, creating an isolated support path that eliminates harmful contact forces from reaching the pressure diaphragm, thus improving measurement accuracy without adding complex isolation mechanisms.
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 design effectively isolates the elastic diaphragm, reducing measurement errors and ensuring accurate pressure readings by minimizing stress and contact points, allowing for efficient assembly and disassembly.
Implementation Method 1
a proximal end of the pressure channel is communicated with the sensing cavity; one side surface of a longitudinal proximal end of the elastic diaphragm is provided with a pressure measurement circuit
Implementation Method 2
sets the Wheatstone bridge composed of the strain gauge or the thick film pressure-sensitive resistors on the other side surface of the metal diaphragm to measure the pressure
Data Source
AI summary
A pressure sensor includes a pressure port provided with a pressure channel extending longitudinally; a pressure sensitive head, wherein a longitudinal distal end of the pressure sensitive head is recessed inward to form a connection cylinder provided with a sensing cavity, and a longitudinal proximal end of the pressure sensitive head correspondingly formed with an elastic diaphragm; a terminal connector and a housing enclosed with the pressure port to form a mounting cavity; a mounting seat and a signal assembly provided in the mounting cavity; and a plurality of electrical connectors electrically connected to the signal assembly after passing through the terminal connector. One side surface of a longitudinal proximal end of the elastic diaphragm is provided with a pressure measurement circuit, and a proximal end of the connection cylinder is sealedly connected to the pressure port.