Pressure Sensor Protrusions Stabilize Ceramic Assembly
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Solution Overview
Problem
Existing pressure sensors face challenges in maintaining a constant sensor position due to variations in constituent parts, leading to increased offset voltage and complicated calibration, which decreases productivity.
Innovation Solution
A pressure sensor design featuring a ceramic sensor with a thin-film diaphragm and protrusions on the holder that apply load to the outer edge of the resistive bodies, stabilizing the sensor assembly and minimizing distortion, allowing for easier calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the sensor is fixed by pressing it against the body without protrusions, then the assembly process is simple, but the sensor position varies due to constituent part variations, causing large offset voltage
Solution Approach 1:
Protrusions are introduced as intermediary elements between the holder and the sensor to mediate the pressing force. These protrusions concentrate the pressing load to specific contact points on the sensor, ensuring consistent positioning and reducing offset voltage while maintaining assembly simplicity
Solution Approach 2:
Instead of distributing the pressing force uniformly across the entire sensor surface, the pressing force is concentrated at specific local points where the protrusions contact the sensor. This localized force application ensures consistent sensor positioning without requiring complex assembly procedures
2Strength
If the pressing load is applied directly to the diaphragm portion with resistive bodies, then the sensor is firmly fixed, but the resistive bodies become distorted, causing measurement errors
Solution Approach 1:
The pressing force is applied locally at the outer circumferential region of the sensor through protrusions, rather than directly on the diaphragm portion with resistive bodies. This localized force application provides firm fixing while avoiding distortion of the sensitive resistive bodies in the central measurement area
Solution Approach 2:
The sensor surface is functionally segmented into different regions: the outer circumferential region for mechanical support and positioning (where protrusions apply force), and the central diaphragm region for pressure sensing (where resistive bodies are located). This segmentation allows independent optimization of fixing strength and measurement precision in different areas
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 ensures stable assembly and reduced variations in detected pressure, minimizing offset voltage and simplifying calibration, thereby enhancing productivity and maintaining consistent sensor performance.
Implementation Method 1
the thin film becomes deformed responsive to the pressure of the fluid that is introduced through the port into the interior of the body, and by an amount of distortion of the strain gauge provided on the sensor undergoing a change, the pressure is detected
Implementation Method 2
a load from the pressing portion is applied to the protrusions, which are disposed on the outer circumferential side with respect to the resistive bodies. Therefore, deformation of the diaphragm portion caused by direct application of load to the diaphragm portion on which the resistive bodies are disposed, is suppressed
Data Source
AI summary
A pressure sensor is equipped with a body including a fluid passage in the interior thereof, a holder connected to one end of the body, and a ceramic sensor accommodated in the interior of the holder. Plural protrusions are disposed on an outer edge portion of an end surface of the sensor, which is pressed by the holder. In addition, when the holder is fastened with respect to the body, in a state in which a pressing portion of the holder abuts against the protrusions, a fastening force is applied in an axial direction, and the sensor is fixed.