Multi-variable Mass Flow Rate Transfer Device with Dynamic Thresholds
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Solution Overview
Problem
Conventional multi-variable mass/flow rate transfer devices face challenges in accurately determining the appropriateness of accumulated flow rates due to increased differences between threshold values as elapsed time increases, leading to imprecision in flow rate judgments.
Innovation Solution
A multi-variable mass/flow rate transfer device with a differential pressure/static pressure/temperature calculating unit, an instantaneous flow rate calculating unit, an accumulation counter, and an accumulated flow rate alarm unit, where threshold values for the accumulated flow rate are set using formulas S1=A·t·((100+a)/100)+B and S2=A·t·((100−a)/100)−B, allowing for precise judgment of accumulated flow rates and adjustable error ±B.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the elapsed time is increased for flow rate measurement, then the accumulated flow rate value increases, but the difference between threshold values increases leading to reduced judgment precision
Solution Approach 1:
The patent changes the parameters used for threshold calculation from simple proportional relationships to quadratic relationships involving elapsed time. Specifically, the upper limit threshold is calculated as S1 = A·t·(100+a)/100 + B and the lower limit threshold as S2 = A·t·(100-a)/100 - B, where the thresholds now account for both linear accumulation and time-dependent variation components. This parameter transformation allows the system to maintain judgment precision even as elapsed time increases.
2Quantity of substance
If the elapsed time increases, then the accumulated flow rate increases, but the difference between upper and lower threshold values increases causing imprecision in flow rate appropriateness judgment
Solution Approach 1:
The patent introduces dynamic adjustment of threshold values based on elapsed time. The thresholds are no longer static but dynamically adapt to the measurement duration. The system calculates upper and lower limit thresholds that change with time, allowing the measurement system to maintain appropriate precision across different time scales. This dynamic approach enables accurate judgment of whether accumulated flow rates are appropriate regardless of how long the measurement has been proceeding.
Data Source
AI summary
A multi-variable mass/flow rate transfer device is provided with: a differential pressure/static pressure/temperature calculating unit for calculating a differential pressure value, a static pressure value, and a temperature value in real time based upon a signal detected from a process; an instantaneous flow rate calculating unit for calculating an instantaneous flow rate based upon the differential pressure value, the static pressure value, and the temperature value; an accumulation counter for accumulating the calculated instantaneous flow rate of the instantaneous flow rate calculating unit so as to produce an accumulated flow rate; and an accumulated flow rate alarm unit for producing an alarm when the accumulated flow rate produced by the accumulation counter becomes a predetermined value.