Liquid Flowmeter Testing Sealant Film Vaporization
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Solution Overview
Problem
Existing methods for testing liquid flowmeters, particularly those measuring very low flow rates, face errors due to vaporization of the test liquid and the formation of droplets, which affect the accuracy of the measured flow rates.
Innovation Solution
A testing method that introduces a test liquid and a sealant with a lower specific gravity into a weighing tank, allowing the test liquid to pass through a flowmeter at a constant rate, while using a data processor to calculate the standard flow rate and instrumental error, thereby preventing vaporization and droplet formation by forming a sealant film on the test liquid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a liquid passage type weighing method is used to achieve high-accuracy calibration, then measurement precision is improved, but vaporization of the test liquid and droplet formation occur causing errors
Solution Approach 1:
A sealant film is introduced as an intermediary substance between the test liquid and the surrounding environment. This film prevents vaporization of the test liquid and eliminates droplet formation during the weighing process, thereby resolving the harmful effects while maintaining measurement precision
Solution Approach 2:
The sealant is applied to the test liquid before the weighing measurement begins. This preliminary action creates a protective barrier that prevents vaporization and droplet formation during the entire measurement process, counteracting the harmful effects before they can occur
2Productivity
If a diverter is used to discharge test liquid into a weighing tank, then flow rate measurement is enabled, but device complexity and cost increase
Solution Approach 1:
The diverter component is completely removed from the testing apparatus. Instead of using a mechanical diverter to control liquid discharge, the system directly introduces the test liquid into the weighing tank, simplifying the device structure while maintaining flow rate measurement capability through the weighing process
Solution Approach 2:
The weighing tank serves multiple functions: it receives the test liquid, measures the weight for flow rate calculation, and contains the sealant film to prevent vaporization. This multi-functionality eliminates the need for separate diverter components
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 method accurately tests liquid flowmeters by preventing vaporization and droplet errors, ensuring precise calibration of flow rates, especially for micro-flow rates, and simplifies the testing process by eliminating the need for a diverter, thus reducing costs.
Implementation Method 1
introducing a test liquid and a sealant having a specific gravity smaller than that of the test liquid into a weighing tank until an outlet of a pipe is submerged in the test liquid
Implementation Method 2
acquiring readings of a weighing scale configured to measure a weight of the weighing tank at multiple time points
Data Source
AI summary
A testing method for testing a liquid flowmeter, the method including introducing a test liquid and a sealant having a specific gravity smaller than that of the test liquid into a weighing tank until an outlet of a pipe is submerged in the test liquid; causing the test liquid to pass through the pipe; acquiring readings of a weighing scale configured to measure a weight of the weighing tank at multiple time points, and time information representing the time points; acquiring readings of the liquid flowmeter; calculating a standard flow rate of the test liquid based on the readings of the weighing scale at the multiple time points and the time information; and calculating an instrumental error between a measured flow rate based on the readings of the liquid flowmeter and the standard flow rate.