Pressure Sensor Heat Dissipation Member for Engine Combustion Chamber
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Solution Overview
Problem
Existing pressure sensors using liquid as a pressure transmission medium face accuracy issues due to thermal decomposition at high temperatures, leading to increased internal pressure and inaccurate measurements, as they lack effective cooling mechanisms for the transmission medium.
Innovation Solution
A pressure sensor design incorporating a hollow liquid-enclosing container with a heat-dissipating member and an uneven inner surface to enhance heat dissipation, utilizing high thermal conductivity materials and a pressure detection element that converts pressure into an electric signal, effectively managing temperature and preventing thermal decomposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a liquid is used as a pressure transmission medium, then pressure transmission accuracy is improved, but thermal decomposition occurs at high temperatures leading to gas generation and internal pressure increase
Solution Approach 1:
A heat dissipation member is introduced as an intermediary component between the high-temperature environment and the pressure transmission medium. This mediator absorbs and conducts heat away from the liquid, preventing thermal decomposition while allowing the liquid to continue functioning as an effective pressure transmission medium for accurate measurements.
Solution Approach 2:
The thermal parameters of the system are changed by introducing a material with high thermal conductivity (the heat dissipation member) into the pressure sensor housing. This parameter change enables efficient heat transfer from the pressure transmission medium to the housing, maintaining the liquid's stability at high operating temperatures.
2Device complexity
If no cooling mechanism is provided, then device complexity is reduced, but thermal decomposition of the pressure transmission medium occurs
Solution Approach 1:
The housing structure itself is designed to serve as a heat dissipation component by incorporating a heat dissipation member. This self-service approach allows the housing to perform both its structural function and its cooling function, eliminating the need for separate active cooling mechanisms while preventing thermal decomposition.
Solution Approach 2:
The heat dissipation member integrated into the housing performs multiple functions: it provides structural support as part of the housing while simultaneously acting as a heat sink and thermal conduction path. This multi-functionality reduces overall device complexity while effectively preventing thermal decomposition of the pressure transmission medium.
3Temperature
If the liquid temperature exceeds the use upper limit, then thermal decomposition occurs, but cooling the pressure transmission medium directly is complex
Solution Approach 1:
Instead of directly cooling the pressure transmission medium, a heat dissipation member is introduced as an intermediary that absorbs heat from the medium and conducts it to the housing. This indirect cooling approach effectively controls the medium's temperature below its decomposition point while avoiding the complexity of direct cooling systems.
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 design significantly improves heat dissipation characteristics, preventing excessive temperature rises and thermal decomposition of the pressure transmission fluid, enabling accurate pressure measurements even in high-temperature environments.
Implementation Method 1
a heat-dissipating member (7) which is in contact with each of a part of an inner wall of the liquid-enclosing container (3) and the pressure transmission fluid (6)
Implementation Method 2
a diaphragm (4) which is elastically deformed when receiving pressure to transmit the pressure to the pressure transmission fluid (6)
Data Source
AI summary
A pressure sensor includes a connection portion provided with a screw portion configured to fix the pressure sensor to a combustion chamber of a vehicle engine; a hollow liquid-enclosing container fixed to one end of the connection portion; a pressure transmission fluid enclosed inside the liquid-enclosing container; a diaphragm fixed to one end of the liquid-enclosing container and elastically deformed when receiving pressure to transmit the pressure to the pressure transmission fluid; a pressure detection element fixed to the other end of the liquid-enclosing container and detecting the pressure transmitted to the pressure transmission fluid and converts the detected pressure into an electric signal; and a heat-dissipating rod provided inside the liquid-enclosing container. The connection portion and the liquid-enclosing container, and the connection portion and the diaphragm are mechanically connected to each other by welding or the like.