Welded Pressure Detection Module Sealing Structure
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Solution Overview
Problem
Existing absolute pressure sensors, including oil-filled and strain gauge types, face issues such as high costs, oil leakage risks, and complex, unreliable sealing schemes.
Innovation Solution
A pressure detection module featuring a pressure joint connected to a force sensitive component with attached strain gauges, an electrical connector, and an end cap with a simplified sealing structure, which includes a welded pressure joint and electrical connector to ensure reliable sealing without complex schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an oil filled pressure sensor is used, then the pressure detection function is achieved, but the cost is high and oil leakage risk exists
Solution Approach 1:
The patent extracts and eliminates the oil-filled chamber from the pressure sensor structure, replacing it with a strain gauge-based sealing solution. This removes the source of oil leakage while maintaining pressure detection functionality through the strain gauge membrane system.
Solution Approach 2:
The patent replaces the expensive oil-filled system with a more economical strain gauge-based sealing structure. The sealing relies on the mechanical properties of the strain gauge membrane and supporting structures rather than requiring costly oil-filled chambers and complex sealing mechanisms.
2Ease of manufacture
If a strain gauge pressure sensor is used, then the cost is reduced, but the sealing scheme becomes complex and reliability decreases
Solution Approach 1:
The patent segments the sealing function into distinct components: the strain gauge membrane, the supporting structure, and the end cap. Each component has a specific sealing function, and their modular arrangement simplifies the overall sealing scheme while maintaining reliability. The electrical connector seat is separately sealed from the pressure sensing area.
Solution Approach 2:
The patent introduces an intermediary sealing structure between the electrical connector and the pressure sensing chamber. The seat and its sealing ring act as intermediaries that isolate the electrical components from the pressure environment while maintaining the integrity of both systems.
3Reliability
If a complex sealing scheme is used in strain gauge pressure sensors, then sealing coverage is improved, but the device complexity and cost increase
Solution Approach 1:
The patent merges the sealing functions into integrated structures. The end cap, supporting structure, and electrical connector seat are designed as unified components with built-in sealing features. The sealing rings are incorporated directly into these components rather than being separate elements, reducing overall complexity.
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 provides a cost-effective, reliable, and accurate pressure detection system by simplifying the sealing structure and avoiding the risks associated with oil-filled sensors.
Implementation Method 1
A strain gauge in attached to a surface of the force sensitive component
Implementation Method 2
One end of the pressure joint is welded to an open end of the end cap
Data Source
AI summary
A pressure detection module includes a pressure joint. A force sensitive component of the module is connected to one end of the pressure joint. A strain gauge in attached to a surface of the force sensitive component. An electrical connector of the module has a seat and a pin that passes therethrough. An electrical connection board electrically connects the pin to the strain gauge. An end cap of the module includes a peripheral wall, an end wall, and an opening opposite to the end wall, the force sensitive component and the electrical connection board are accommodated in an inner cavity thereof. One end of the pressure joint is welded to the open end of the end cap. A socket is formed in the end wall of the end cap, and the seat is inserted into the socket and welded to the end wall.