Pre-pressurized Pressure Transfer Module for High Temperature Accuracy
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Solution Overview
Problem
Existing pressure transfer modules face challenges in accurately transmitting pressures of less than or equal to 100 mbar at high temperatures due to evaporation and outgassing of pressure transfer liquids, leading to potential plastic deformation and significant pressure measurement errors.
Innovation Solution
A pressure transfer module with an isolating diaphragm and a transfer diaphragm, both under pre-pressure, which assumes a starting position that deflects non-axisymmetrically in response to the pressure to be transmitted, using a pressure transfer liquid pre-pressurized to at least 30 mbar to reduce evaporation and maintain accuracy at elevated temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If pressure transfer liquid is used at high temperatures, then pressure transmission function is maintained, but evaporation and outgassing occur leading to measurement errors
Solution Approach 1:
The patent introduces a pre-pressure parameter (at least 30 mbar) applied to the diaphragm before actual pressure measurement. This pre-pressure parameter suppresses evaporation and outgassing of the pressure transfer liquid at high temperatures, thereby maintaining measurement accuracy while enabling operation at elevated temperatures up to 400°C.
2Strength
If isolating diaphragm stiffness is increased, then protective function against high temperatures is improved, but pressure transmission accuracy deteriorates
Solution Approach 1:
The patent applies a pre-pressure to the diaphragm before the actual pressure measurement process. This preliminary action stabilizes the diaphragm in a controlled state, reducing its stiffness variations and minimizing corruption of the pressure signal during subsequent measurements, thus maintaining accuracy while preserving protective functionality.
3Speed
If pressure transfer liquid volume is reduced, then response time is improved, but evaporation effects are amplified
Solution Approach 1:
The patent employs a pre-pressure parameter (at least 30 mbar) that suppresses evaporation and outgassing of the pressure transfer liquid. This allows the system to use smaller volumes of pressure transfer liquid for faster response times without suffering from amplified evaporation effects, as the pre-pressure condition prevents significant substance loss.
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 solution allows for accurate pressure transfer at higher temperatures, reducing the risk of measurement errors and maintaining diaphragm stability, enabling operation up to 400°C with minimal thermal impact on the pressure transfer liquid.
Implementation Method 1
a pressure transfer path connecting the first pressure chamber with the second pressure chamber, wherein the first and the second pressure chambers and the pressure transfer path are filled with a pressure transfer liquid, via which a pressure acting externally on the isolating diaphragm is transmitted to the transfer diaphragm
Implementation Method 2
At such temperatures, the pressure transfer liquid in the hydraulic path can evaporate or outgas. The pre-pressure of at least 30 mbar reduces evaporation and outgassing of the pressure transfer liquid
Data Source
AI summary
A pressure transfer module for transfer of pressures less equals 100 mbar, and suitable for high temperature applications, comprising an isolating diaphragm outwardly sealing a first pressure chamber; a transfer diaphragm outwardly sealing a second pressure chamber; and a pressure transfer path connecting the first pressure chamber with the second pressure chamber. The first and the second pressure chambers and the pressure transfer path are filled with a pressure transfer liquid, via which a pressure acting externally on the isolating diaphragm is transmitted to the transfer diaphragm. The pressure transfer liquid is under a pre-pressure, especially a pre-pressure of greater than or equal to 30 mbar, especially greater than or equal to 50 mbar. The isolating diaphragm and the transfer diaphragm under the pre-pressure assume a starting position, from which they are deflected by the pressure to be transmitted, and the starting positions of isolating diaphragm and transfer diaphragm lie as a function of size of the pre-pressure and size of the pressure to be transmitted within deflection ranges of the diaphragms, in which deflections from their starting positions have due to their formation a non-axisymmetric part, especially an antisymmetric part.