Magnetic Drive Metering Pump Diaphragm Deformation Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Magnetic drive metering pumps face limitations in hydraulic properties and accuracy due to elastic diaphragm deformation under varying pressures, leading to reduced metering accuracy and the need for frequent recalibration, especially when handling aggressive chemicals.
Innovation Solution
A positional sensor detects the motion of a thrust member and connecting rod, providing a signal to a control circuit that adjusts the magnetizing coil current to follow a predetermined nominal profile, compensating for diaphragm deformation and maintaining accuracy across a wider operational range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a magnetic drive metering pump operates with an elastic diaphragm, then the pump structure is simple and easy to manufacture, but the metering accuracy deteriorates due to diaphragm deformation under varying pressures
Solution Approach 1:
A positional sensor detects the actual position of the thrust member and connecting rod during operation, providing real-time feedback to a control circuit. The control circuit adjusts the magnetizing coil current to compensate for diaphragm deformation, ensuring the metering stroke follows a predetermined nominal profile despite pressure variations
Solution Approach 2:
The patent replaces purely mechanical metering (based on fixed diaphragm stroke) with a controlled electromagnetic system. The magnetizing coil current is dynamically adjusted based on positional feedback, substituting rigid mechanical positioning with flexible electromagnetic control to maintain accuracy
2Productivity
If the thrust member moves quickly to complete the stroke, then productivity is improved, but pressure peaks increase causing harmful effects
Solution Approach 1:
The patent implements dynamic control of the magnetizing coil current throughout the stroke cycle. The current profile is adjusted in real-time based on the positional feedback, allowing the system to optimize stroke speed while preventing excessive pressure peaks by modulating the magnetic force applied to the thrust member
3Measurement precision
If the diaphragm is made more rigid to reduce deformation, then metering accuracy is improved, but the device complexity increases
Solution Approach 1:
Rather than modifying the diaphragm's mechanical properties (which would increase complexity), the patent substitutes mechanical rigidity with electromagnetic control. The positional sensor and control circuit dynamically adjust the magnetizing force to compensate for diaphragm flexibility, achieving accuracy without structural modification
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 solution enhances metering accuracy and extends the operational range of magnetic drive pumps by controlling diaphragm motion, reducing errors caused by diaphragm deformation and eliminating the need for frequent recalibration, while maintaining the pumps' advantages of easy and cost-effective manufacture.
Implementation Method 1
on electrically activating a magnetizing coil (2), the thrust member (20) is drawn into the magnet shroud (17)
Implementation Method 2
A compression spring or recuperating spring (23), with uncontrolled magnets, keeps the thrust member from an inner face of the magnet shroud
Data Source
AI summary
A magnetic drive metering pump in which a movable thrust member is fixed to a diaphragm and is axially movable in a magnet shroud. The thrust member, on electrically actuating the magnet shroud, is drawn into the magnet shroud against the force of a recuperating spring, and after deactivating the magnet shroud, is returned to a starting position. The diaphragm cooperates alternately with an outlet and an inlet valve to produce a pump stroke in a pump metering head. The magnetic drive metering pump has a reference element associated with the thrust member and diaphragm, the position of which reference element is detected by a positional sensor. The positional sensor provides a signal which has a fixed relationship to the position of the reference element, and the motion of the thrust member is controlled by a control circuit such that it follows a predetermined nominal profile.