Draft Range Transmitter Enclosure for Wind-Resistant Pressure Measurement
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Solution Overview
Problem
Differential pressure sensors used in combustion systems are prone to false readings due to slight changes in ambient atmospheric pressure caused by wind or other air flow, leading to nuisance maintenance and shutdowns, especially when placed outdoors.
Innovation Solution
A wind-resistant enclosure with a vent mechanism that includes a semipermeable membrane and a breather cap to equalize air pressure internally with ambient pressure, while preventing external air flow from affecting the sensor, and thermal insulation to maintain uniform temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the differential pressure transmitter is placed outdoors for ambient pressure measurement, then the measurement function is enabled, but wind and air flow cause false pressure swings leading to measurement errors
Solution Approach 1:
The system is divided into two separate pressure sensing locations: one port measures combustion chamber pressure while the other port measures ambient atmospheric pressure. By spatially separating these measurements and processing them differentially, the system enables outdoor installation while maintaining measurement accuracy through compensation of ambient pressure variations.
Solution Approach 2:
The ambient pressure port acts as an intermediary that captures environmental pressure changes (including wind effects) and allows the differential pressure calculation to compensate for these changes. This intermediary measurement enables the system to distinguish between true combustion pressure changes and spurious ambient pressure fluctuations.
2Speed
If the transmitter is exposed to ambient atmospheric pressure directly, then real-time pressure monitoring is achieved, but temperature changes and wind gusts create false measurement swings
Solution Approach 1:
The system dynamically adapts to changing environmental conditions by continuously measuring ambient pressure and using it as a reference in the differential calculation. This dynamic compensation approach allows the system to maintain reliable measurements despite temperature fluctuations and wind gusts, as the ambient port captures these changes in real-time for correction.
3Stability of the object's composition
If the atmospheric port is open to ambient air, then atmospheric pressure equalization is achieved, but wind passing across the port creates pressure changes and false measurements
Solution Approach 1:
The atmospheric pressure port is positioned and designed to achieve equipotential pressure equalization with the ambient environment, ensuring that the internal reference pressure matches external atmospheric pressure under normal conditions. This equipotential state allows the system to maintain measurement stability while remaining sensitive to true pressure changes.
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 effectively reduces or eliminates false readings by isolating the sensor from wind and temperature fluctuations, ensuring accurate pressure measurements and reducing maintenance and shutdowns.
Implementation Method 1
The vent also preferably includes a semipermeable membrane to slow or limit transfer of air through the vent.
Implementation Method 2
The pressure inside the enclosure changes at the same rate as the barometric pressure but is unaffected by wind or wind gusts.
Implementation Method 3
thermal insulation to maintain uniform temperature
Data Source
AI summary
A method and structure which provide an ambient pressure measurement that is unaffected by wind and localized environmental conditions. A draft range pressure transmitter is enclosed inside an enclosure which is resistant to wind and other transient localize environmental conditions. A vent cap allows slow air movement through a wall of the enclosure and forms a still air chamber for the transmitter. The pressure inside the enclosure changes at the same rate as the barometric pressure but is unaffected by wind or wind gusts.