Magnetic Dosing Pump Hydraulic Parameter Determination
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Solution Overview
Problem
Existing magnetic dosing pumps face challenges in accurately controlling low dosing speeds and handling variations in fluid density and viscosity without additional sensors, leading to inaccuracies in fluid delivery, especially in applications like chlorination of drinking water.
Innovation Solution
A method to determine hydraulic parameters such as fluid density and viscosity without additional sensors by using existing position sensors to measure the displacement element's position, speed, and acceleration, and applying optimization calculations based on physical models of the hydraulic system, allowing for model-based control of the pump's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional sensors are installed to measure fluid density and viscosity, then measurement precision improves, but device complexity increases
Solution Approach 1:
The system uses existing position sensors to measure displacement element position, speed, and acceleration, and applies optimization calculations based on physical models to determine hydraulic parameters. The pump system itself generates the measurement data through its operation, eliminating the need for external measurement devices.
Solution Approach 2:
The patent introduces a control unit that acts as an intermediary, processing signals from existing position sensors and using optimization algorithms to derive hydraulic parameters. This control unit mediates between the mechanical movement and the hydraulic parameter determination without requiring direct fluid property sensors.
2Adaptability or versatility
If control parameters are stored in memory for different pressure piece position states, then adaptability improves, but device complexity increases
Solution Approach 1:
The system dynamically determines control parameters through optimization calculations based on real-time position, speed, and acceleration data from the displacement element. Rather than storing pre-defined parameters for different states, the system continuously adapts parameters through model-based optimization, making the control system flexible without requiring extensive memory storage for different operating conditions.
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 improves control accuracy and reduces the need for additional sensors, enabling precise fluid delivery even at low dosing speeds and varying fluid conditions, enhancing the reliability of magnetic dosing pumps.
Implementation Method 1
If a current is now applied to the electromagnet, a magnetic flux is formed, which moves the correspondingly designed pressure piece within the electromagnet from its second position to the first position
Implementation Method 2
As long as no current is flowing through the electromagnet so that no magnetic flux is built up inside, the spring-loaded preload ensures that the pressure piece and thus the diaphragm are held in a specified position
Implementation Method 3
During the return movement, i.e. during the movement from the second to the first position, the connection to the suction line is closed, the pressure of the delivery fluid will increase due to the decreasing volume in the dosing chamber
Data Source
Figure 1
Figure 2a~2e
Figure 3~4
AI summary
The invention relates to a method for determining hydraulic parameters in a displacement pump, wherein the displacement pump has a movable displacement element, which bounds the metering chamber, which is connected to a suction and pressure line by means of valves, wherein a drive is provided for the oscillating motion of the displacement element. In order that pumped fluid can be alternately sucked into the metering chamber via the suction line and pressed from the metering chamber via the pressure line by means of an oscillating motion of the displacement element, a physical model having hydraulic parameters according to the invention is established for the hydraulic system, the force exerted by the displacement element on the fluid located in the metering chamber or the pressure in the metering chamber is determined and the position of the displacement element is determined, and at least one hydraulic parameter is calculated by means of an optimization calculation.