Pump Flow Volume Determination Using Speed and Pressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for determining the flow volume of fluids delivered by pumps, particularly positive-displacement pumps, face inaccuracies due to internal gaps and fluid backflow, leading to increased complexity and reduced efficiency when using volumetric flowmeters.
Innovation Solution
A method that calculates flow volume based on predefined pump geometry, rotation speed, and pressure information, allowing for improved accuracy by modeling leakage effects and using sensors to determine relevant parameters, potentially eliminating the need for separate volumetric flowmeters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a volumetric flowmeter is disposed in the feed line or discharge line of the pump, then the flow volume can be monitored or controlled, but the complexity and occupation of installation space increase
Solution Approach 1:
The invention extracts the flow measurement function from a separate volumetric flowmeter and integrates it into the pump's existing control mechanism. By using sensors already present in the pump system (rotation speed sensor, pressure sensors) and processing data through the existing control unit, the measurement function is obtained without adding external measurement devices, thereby reducing system complexity and installation space.
2Measurement precision
If a volumetric flowmeter is used to monitor flow volume, then accurate measurement is achieved, but the efficiency of the pump is reduced
Solution Approach 1:
The pump system performs flow measurement using its own existing components and data. The control mechanism, which already controls pump operation, also calculates flow volume by processing data from rotation speed sensors and pressure sensors that are integral to the pump's operation. This self-service approach eliminates the need for external flowmeters that would create additional pressure drops and reduce pump efficiency.
3Ease of manufacture
If theoretical delivery volume is calculated without considering internal gaps, then calculation is simple, but measurement precision is insufficient due to fluid backflow
Solution Approach 1:
The invention changes the parameters used in flow calculation from purely geometric parameters (pump volume per revolution) to include operational parameters that reflect actual operating conditions. By incorporating rotation speed information and pressure information (differential pressure at the pump), the calculation accounts for leakage effects that vary with operating conditions, significantly improving accuracy while maintaining computational simplicity through the use of readily available sensor data.
Solution Approach 2:
The system uses feedback from pressure sensors and rotation speed sensors to continuously adjust the flow volume calculation. The pressure information provides feedback on the actual operating conditions including leakage effects, and this feedback is processed by the control mechanism to determine accurate flow volume. This feedback-based approach enables accurate measurement without complex external instrumentation.
Data Source
AI summary
A method for determining a flow volume of a fluid delivered by a pump. The flow volume is determined as a function of predefined pump information depending on a pump geometry, rotation speed information, which correlates with the rotation speed of the pump, and pressure information, which correlates with a differential pressure at the pump.