Oil-Filled Pressure Sensor With Cured Membrane Seal
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Solution Overview
Problem
Conventional pressure sensors face challenges in minimizing signal damping and achieving watertight sealing, which affects the precision and longevity of the device.
Innovation Solution
A pressure sensor device is produced using a cavity filled with oil and covered by a membrane that is applied and cured in situ, ensuring airtight, oil-tight, and watertight sealing, reducing damping and improving signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gel is used as filling medium, then watertight sealing is achieved, but signal damping increases
Solution Approach 1:
The patent introduces a membrane as an intermediary layer between the oil filling medium and the external environment. This membrane provides the necessary sealing function while allowing the low-damping oil medium to transmit pressure signals effectively to the sensor.
Solution Approach 2:
The patent replaces gel with oil as the filling medium, utilizing hydraulic principles. Oil provides superior signal transmission with minimal damping while the membrane creates an effective seal, combining the benefits of fluid mechanics with protective sealing.
2Reliability
If membrane is applied to seal oil, then sealing performance improves, but gas inclusions may be trapped
Solution Approach 1:
The patent applies the membrane to the oil surface before final assembly, allowing any gas inclusions to be expelled during the application process. This preliminary action prevents gas traps from forming in the final sealed configuration.
Solution Approach 2:
The membrane application process itself serves to eliminate gas inclusions. As the membrane is applied and conformally contacts the oil surface, gas is naturally pushed out, making the process self-cleaning regarding gas entrapment.
3Ease of manufacture
If conventional sealing methods are used, then assembly is simple, but sealing reliability decreases
Solution Approach 1:
The patent employs a flexible membrane that can be applied conformally to the oil-filled cavity. This thin film approach provides superior sealing reliability compared to conventional rigid sealing methods while maintaining relative assembly simplicity through the application process.
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 method enhances the precision and longevity of pressure sensors by minimizing signal damping and ensuring robust sealing, allowing for precise pressure measurement while preventing gas inclusions that could compress the signal.
Implementation Method 1
curing of the liquid material of the membrane takes place
Data Source
AI summary
A method for producing a pressure sensor device. The method includes providing a vessel that includes a cavity having side walls, the cavity including a floor and the side walls each including an upper side, which face away from the floor; providing a pressure sensor and situating the pressure sensor in the cavity and on the floor; filling the cavity with an oil so that the oil fills the cavity up to the upper sides of the side walls; applying a membrane onto the surface of the oil that completely covers the oil, and at least in some regions onto the upper sides of the side walls so that the membrane covers, circumferentially around the cavity, those regions of the upper sides of the side walls that lie against the oil, the membrane including a liquid material when applied onto the oil; and curing the liquid material of the membrane.