Pressure Compensation Chamber for Compact High-Pressure Flow Sensing
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Solution Overview
Problem
Fluid sensing apparatuses in mass flow controllers face limitations due to their inability to withstand high internal pressures, leading to potential leakage and failure, particularly in miniature applications where robustness increases size, weight, and manufacturing complexity.
Innovation Solution
Incorporating a pressure compensation chamber and conduits that balance internal fluid pressure with external pressure, reducing the burden on the sensor casing and allowing for the use of lighter, smaller, and less complex components, while maintaining accurate flow control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor casing is reinforced to withstand high internal pressures, then reliability is improved, but device complexity and size increase
Solution Approach 1:
A pressure compensation chamber is introduced as an intermediary element between the sensor casing and the high-pressure fluid environment. The chamber receives compensation fluid through a compensation conduit, which exerts external pressure on the sensor casing to balance the internal pressure differential, allowing the casing to withstand high internal pressures without requiring complex reinforcement
Solution Approach 2:
The pressure management function is segmented into separate components: the sensor casing专注于 sensing, the pressure compensation chamber handles pressure balancing, and the compensation conduit manages fluid transfer. This segmentation allows each component to be optimized independently, with the casing remaining simple while the compensation system handles the pressure resistance requirement
2Reliability
If the sensor casing is reinforced to withstand high internal pressures, then reliability is improved, but weight increases
Solution Approach 1:
The pressure compensation chamber acts as a mediator that redistributes the pressure load. By introducing compensation fluid into the chamber, the external pressure on the sensor casing is increased to match the internal pressure, eliminating the need for heavy casing reinforcement and reducing overall sensor weight
3Reliability
If the sensor casing is reinforced to withstand high internal pressures, then reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The pressure compensation chamber and conduit system provides a standardized interface for pressure management. The compensation conduit connects the chamber to the fluid supply, and the chamber provides a uniform pressure distribution on the sensor casing, simplifying the manufacturing process compared to creating complex reinforced casing structures
Solution Approach 2:
The manufacturing process is segmented into separate steps: manufacturing the simple sensor casing, manufacturing the pressure compensation chamber, and assembling them with the compensation conduit. This allows each component to be manufactured using standard processes without requiring complex integrated pressure-resistant casing fabrication
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 design enhances the reliability and compactness of fluid sensing apparatuses by minimizing the risk of leakage and failure, enabling their use in compact devices like miniature mass flow controllers while maintaining accurate flow regulation and measurement capabilities.
Implementation Method 1
a pressure compensation chamber in which the casing of the fluid sensor is enclosed, and at least one pressure compensation conduit is in fluid communication with the pressure compensation chamber
Data Source
AI summary
There is provided a fluid sensing apparatus comprising a fluid flow channel, at least one fluid conduit in fluid communication with the fluid flow channel, and a fluid sensor having a casing and at least one sensor port in fluid communication with the at least one fluid conduit and providing access into the casing. The fluid sensing apparatus also includes a pressure compensation chamber in which the casing of the fluid sensor is enclosed. The apparatus further includes at least one pressure compensation conduit in fluid communication with the pressure compensation chamber and with the fluid flow channel. Also provided is a mass flow controller including such a fluid sensing apparatus.