Pressure Sensor Front Seal Stress Isolation
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Solution Overview
Problem
Pressure sensors with front seals face stress transfer issues, leading to reduced accuracy in high-pressure and high-temperature environments, and there is a need to improve sensors with Helmholtz resonators.
Innovation Solution
The design incorporates a sensing element, header, housing, and adaptor with strategically placed gaps to isolate stress from the sensing element and header, and optionally includes a screen to form a Helmholtz resonator, reducing stress transfer and improving frequency response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a front seal is formed directly between the header surface and the engine surface or on an adaptor welded to the housing, then the seal is achieved, but undue stress is placed on the header which causes stress to be transferred to the sensing element
Solution Approach 1:
The patent introduces a stress isolation member that segments the stress path between the front seal and the header. This member creates a distinct separation zone where stress from the metal-to-metal seal is absorbed and isolated, preventing direct stress transfer to the header and sensing element, thereby maintaining both seal integrity and measurement accuracy
Solution Approach 2:
The stress isolation member acts as an intermediary component positioned between the front seal assembly and the header. This mediator absorbs and redistributes the stress generated during sealing, preventing it from reaching the sensitive sensing element while still allowing the seal to form effectively
2Reliability
If metal-to-metal seal is used for front seal, then sealing is achieved, but a large amount of stress is generated which is transferred to the sensing element
Solution Approach 1:
The patent converts the harmful stress generated by the metal-to-metal seal into a beneficial isolated force by introducing the stress isolation member. This member is designed to absorb and contain the sealing stress within a specific zone, transforming what would be harmful stress transfer into a controlled local effect that does not compromise the sensing element
Solution Approach 2:
The stress isolation member provides beforehand cushioning by being pre-positioned between the seal assembly and the header. When the front seal is formed, the stress isolation member is already in place to absorb and cushion the impact of the sealing stress, preventing it from reaching the sensing element
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 reduces stress on the sensing element and header, enhancing measurement accuracy and response time, while minimizing fluid impact and maintaining a compact volume.
Implementation Method 1
A first gap may separate the adapter and the sensing element. Also, a second gap may separate the adapter and the header. A stress applied to the adapter may be transferred to the housing. The first gap may be used to isolate the sensing element from the stress. Further, the second gap may be used to isolate the header from the stress.
Implementation Method 2
In another example embodiment, a system may include a sensing element, a header, a housing, an adaptor and a screen. The screen may be disposed in an opening of the housing. A first cavity may be disposed between the screen and the sensing element. A second cavity may be disposed between the adaptor and the sensing element. The screen in combination with the first cavity and the second cavity may form a Helmholtz resonator.
Data Source
AI summary
This disclosure provides example methods, devices, and systems for a sensor having a front seal. In one embodiment, a system may comprise a sensing element; a header coupled to the sensing element; a housing coupled to the header; an adaptor coupled to the housing, wherein a first gap separates the adapter and the sensing element and a second gap separates the adapter and the header; and wherein a stress applied at a front surface of the adapter is transferred to the housing, and the first gap is used to isolate the sensing element from the stress and the second gap is used to isolate the header from the stress.