Flowmeter Bypass Circuit for Accurate Non-Compressible Fluid Measurement
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Solution Overview
Problem
In hydraulic circuits with multiple non-compressible fluids, such as in washing machines, precise measurement is challenging due to varying fluid properties, requiring multiple flowmeters and costly compensation factors or leading to inaccurate measurements.
Innovation Solution
A device with a flowmeter and a bypass system that measures the volume of one fluid by displacing it with another, allowing all fluid to pass through the flowmeter while the second fluid circulates around it, eliminating the need for compensation factors based on fluid properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single flowmeter is used for all fluids in the hydraulic circuit, then the device complexity is reduced, but the measurement precision deteriorates due to varying fluid properties requiring compensation factors
Solution Approach 1:
The hydraulic circuit is segmented into two separate flow paths: a main circuit for the first fluid and a bypass circuit for the second fluid. The flowmeter is exclusively positioned in the main circuit, measuring only the first fluid. This segmentation allows the flowmeter to be optimized for a specific fluid type, maintaining measurement precision while reducing the total number of flowmeters needed.
Solution Approach 2:
A bypass circuit is introduced as an intermediary element that allows the second fluid to circumvent the flowmeter. The bypass includes a control valve that regulates the flow of the second fluid, preventing it from entering the main circuit and interfering with the flowmeter measurements. This intermediary structure enables the use of a single flowmeter for the first fluid without compromising measurement accuracy.
2Device complexity
If compensation factors based on fluid properties are used, then a single flowmeter can measure multiple fluids, but the measurement precision deteriorates due to variable fluid properties within a characteristic range
Solution Approach 1:
The second fluid is extracted from the main circuit through a dedicated bypass path. By removing the second fluid from the measurement path, the flowmeter exclusively measures the first fluid without interference from varying properties of the second fluid. This extraction eliminates the need for compensation factors and maintains high measurement precision.
Solution Approach 2:
Instead of attempting to make the flowmeter adaptable to multiple fluid types through compensation factors, the approach is inverted: the circuit is designed to prevent the second fluid from reaching the flowmeter altogether. The bypass circuit with its control valve actively directs the second fluid away from the measurement path, ensuring the flowmeter only encounters the first fluid with known, stable properties.
3Measurement precision
If multiple flowmeters are used for each fluid, then the measurement precision is maintained, but the device complexity and cost increase
Solution Approach 1:
The bypass circuit serves multiple functions: it allows the second fluid to be introduced into the hydraulic circuit, prevents the second fluid from reaching the flowmeter, and provides a control mechanism for regulating the second fluid flow. This multi-functional design eliminates the need for separate measurement devices for each fluid type.
Solution Approach 2:
The bypass circuit acts as an intermediary structure that reconciles the need to introduce the second fluid into the system with the requirement to maintain accurate measurements of the first fluid. By providing a dedicated path for the second fluid that bypasses the flowmeter, the system achieves both goals without requiring multiple flowmeters.
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 enables accurate and economical measurement of non-compressible fluids independently of their properties, reducing measurement errors and the need for complex equipment.
Implementation Method 1
use of the fact that when an incompressible body is introduced into a container containing a first non-compressible fluid the volume of the first fluid displaced is equal to the volume of the body introduced
Data Source
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AI summary
Device for measuring out a non-compressible fluid, characterized in that it comprises a first fluid inlet and a second fluid inlet, the two first and second liquid inlets being in liquid contact with one another, downstream of the respective inlets; a first outlet of the device and a second outlet of the device, the two first and second outlets being in fluid contact with one another upstream and downstream of the respective outlets, the first outlet having a first outlet valve giving access to the first outlet, the second outlet having a second outlet valve giving access to the second outlet, the second outlet having a flowmeter between said second outlet valve and the connection between outlets downstream thereof.