Vacuum Chamber Gas Flow Rate Calibration
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Solution Overview
Problem
Conventional calibration systems for fluid control equipment face challenges in accurately calculating gas flow rates due to pressure and temperature variations, convection, and water droplets, leading to inaccurate calibration.
Innovation Solution
A flow rate calculation system that places a container with enclosed gas on a weight measurement part within a decompression chamber, evacuating the chamber to prevent convection and water droplets, and using a shared flexible gas line to absorb vibrations and reduce errors, allowing accurate gas flow rate calculation without considering buoyancy influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gas is consumed from the cylinder in atmospheric conditions, then the gas flow rate can be calculated based on weight variation, but convection and water droplets adhere to the cylinder surface causing measurement inaccuracies
Solution Approach 1:
The patent applies vacuum environment (inert atmosphere principle) by placing the cylinder in a decompression chamber. This eliminates air molecules that cause convection and prevents water droplet adhesion, thereby removing the harmful factors while maintaining the weight-based flow rate measurement capability
2Device complexity
If the container is placed in atmospheric conditions for calibration, then the setup is simple, but buoyancy effects must be considered which reduces measurement accuracy
Solution Approach 1:
The patent uses vacuum environment to eliminate buoyancy effects from atmospheric gases. By placing the container in a decompression chamber, the measurement is performed in an environment without air molecules, thereby eliminating buoyancy influence while maintaining relatively simple calibration setup
3Ease of operation
If the container is removed from the decompression chamber for gas enclosure, then gas can be easily enclosed, but the chamber must be re-evacuated each time increasing calibration time
Solution Approach 1:
The patent applies nesting principle by placing the gas enclosure operation inside the vacuum environment. The container remains nested within the decompression chamber during gas enclosure, eliminating the need for repeated chamber evacuation and significantly reducing calibration time
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
Enables precise calibration of fluid control equipment by eliminating convection and buoyancy effects, reducing calibration time and labor, and maintaining consistent vacuum conditions for improved accuracy.
Implementation Method 1
the container and the weight measurement part are placed in a decompressed decompression chamber
Implementation Method 2
a weight measurement part on which the container is disposed
Data Source
AI summary
To accurately calibrate fluid control equipment. A flow rate calculation system includes: a container in which gas is enclosed; a weight measurement part on which the container is disposed; a gas line which connects the container and fluid control equipment and in which the gas flows; and an enclosing line for enclosing the gas in the container disposed on the weight measurement part, thereby allowing the gas to flow from the container to the fluid control equipment or from the fluid control equipment to the container in a state that the container is disposed on the weighing measurement part, and calculating a flow rate of the gas flowing to the fluid control equipment based on an output value outputted from the weight measurement part, and the container and the weight measurement part are adapted to be placed in a decompressed decompression chamber.