Pressure Sensor Thermal Buffer for Diaphragm Bending
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Solution Overview
Problem
Conventional pressure sensors experience diaphragm bending due to rapid thermal expansion differences between the upper and lower parts of the housing, caused by uneven heating of the fluid guiding pipe, which affects the accuracy of pressure measurements.
Innovation Solution
Incorporating a thermal buffer member with a predetermined heat capacity on the inlet pipe to moderate temperature increases and reduce thermal expansion disparities within the housing, along with a shell that diffuses heat uniformly to prevent rapid temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fluid guiding pipe is heated by the heater to prevent contaminant deposition, then the contaminant attachment is prevented, but the lower part of the housing experiences rapid thermal expansion causing diaphragm bending
Solution Approach 1:
A thermal buffer member is introduced as an intermediary component between the fluid guiding pipe and the housing. This buffer member absorbs excess heat from the heated pipe, preventing direct thermal transmission to the housing's lower part. The buffer member acts as a thermal mediator that decouples the heating function from the structural components, eliminating the harmful thermal expansion while maintaining the necessary heating function for contaminant prevention.
2Speed
If the heater rapidly heats the fluid guiding pipe, then the temperature increase is fast and efficient, but the temperature distribution in the housing becomes uneven causing thermal stress
Solution Approach 1:
The thermal buffer member serves as a heat distribution intermediary that receives rapid heating from the fluid guiding pipe and gradually distributes this heat to the housing. This mediation process transforms the rapid, localized heating into a slower, more uniform temperature distribution across the housing, preventing thermal stress while maintaining efficient heating capability.
Solution Approach 2:
The thermal buffer member changes the thermal parameters (temperature and heat flow rate) between the fluid guiding pipe and the housing. By introducing this intermediate thermal zone, the system transforms the direct, rapid temperature change into a moderated, progressive heating process, achieving both speed and uniformity in temperature distribution.
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 ensures a more uniform temperature distribution across the housing, reducing diaphragm bending and enhancing the reliability of pressure measurements by minimizing thermal expansion differences.
Implementation Method 1
The thermal buffer member disposed on the inlet pipe has a predetermined heat capacity
Implementation Method 2
a shell that diffuses heat uniformly to prevent rapid temperature changes
Implementation Method 3
a diaphragm that deforms under pressure... derives a change in the diaphragm 32 as a change in electrostatic capacity
Implementation Method 4
heating a sensor case 80 surrounding the housing 11 by a heater 90
Data Source
AI summary
The pressure sensor comprises the diaphragm, an electrode body, a housing, an inlet pipe, and a thermal buffer member. The diaphragm includes a pressure receiving surface configured to receive a pressure of a measured target fluid. The electrode body includes an electrode surface facing a rear surface of the pressure receiving surface with a gap interposed therebetween. The housing supports the diaphragm so as to form a measuring chamber by surrounding the pressure receiving surface. The inlet pipe is coupled to the housing and configured to guide the measured target fluid into the measuring chamber. The thermal buffer member is disposed on the inlet pipe and has a predetermined heat capacity. Accordingly, the diaphragm is unlikely to bend due to a rapid temperature change in a fluid guiding pipe disposed a fluid line.