Differential-Pressure Flowmeter Temperature Balancer
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Solution Overview
Problem
Differential-pressure flowmeters and flow-rate controllers experience unstable pressure measurements due to temperature differences between ambient temperatures of pressure sensors, leading to potential malfunctions in industrial applications.
Innovation Solution
Incorporating a temperature balancer with high thermal conductivity, such as aluminum alloy A5052, below the pressure sensors and minimizing heat transmission through constricted sections and cooling grooves to equalize ambient temperatures, thereby stabilizing pressure measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If pressure sensors are exposed to ambient temperature variations, then the pressure measurement system remains simple in structure, but the measurement stability deteriorates due to temperature differences between sensors
Solution Approach 1:
A temperature balancer made of high-thermal-conductivity material is introduced as an intermediary component between the pressure sensors and the ambient environment. This temperature balancer equalizes the temperature across both pressure sensors, eliminating temperature-induced measurement instability while maintaining overall structural simplicity.
Solution Approach 2:
The thermal conductivity parameter of the material in the sensor housing is changed by using a high-thermal-conductivity material for the temperature balancer. This parameter change enables efficient heat distribution across the sensor mounting area, ensuring both sensors experience identical ambient temperatures and thus maintaining measurement stability.
2Reliability
If a temperature balancer with high thermal conductivity is added below the pressure sensors, then measurement stability improves by equalizing sensor temperatures, but device complexity increases
Solution Approach 1:
The temperature balancer is merged with the existing sensor housing or mounting structure, forming an integrated component rather than a separate add-on. This merging approach achieves temperature equalization while minimizing the increase in device complexity by combining thermal management functionality with the structural housing.
3Reliability
If heat transmission paths are minimized through constricted sections, then temperature equality between sensors improves, but fluid flow path complexity increases
Solution Approach 1:
The housing structure is segmented into distinct sections with different thermal characteristics. Constricted sections are strategically placed to segment heat transmission paths while the main fluid channel remains uninterrupted. This segmentation allows thermal isolation where needed without complicating the primary fluid flow path.
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 approach ensures accurate and stable pressure measurements and enhances the accuracy and stability of fluid flow-rate control by reducing temperature differences between pressure sensors, leading to improved performance in fluid flow-rate control.
Implementation Method 1
a temperature balancer composed of a material with high thermal conductivity is accommodated in a recess that is formed in the body located below the two pressure sensors
Data Source
AI summary
A differential-pressure flowmeter that can reduce (eliminate) a difference between the ambient temperature of one pressure sensor and the ambient temperature of another pressure sensor so as to allow for accurate and stable pressure measurement is provided, and a flow-rate controller equipped with such a differential-pressure flowmeter is provided. Provided are a body having a main fluid channel through which a fluid, whose pressure is to be measured, flows, and two pressure sensors held by the body and arranged in series relative to the main fluid channel, and a temperature balancer composed of a material with high thermal conductivity is accommodated in a recess that is formed in the body located below the two pressure sensors.