Metering Diaphragm Pump Membrane System Stroke Length
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Solution Overview
Problem
Existing metering diaphragm pumps face challenges in increasing stroke length without reducing the service life of the membrane, and in maintaining a compact design while enhancing delivery capacity.
Innovation Solution
A membrane system with a support element featuring a convexly curved support surface that increases contact with the membrane during the pressure stroke, reducing stress and allowing for greater movement of the core, combined with an elastic support surface and a convexly curved core to enhance membrane support and movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the stroke length is increased relative to the outer diameter of the flexing section to increase the dosing volume, then the delivery capacity is improved, but the membrane service life is reduced due to premature failure
Solution Approach 1:
The support element is positioned to provide preliminary support to the flexing section before the membrane fails, preventing premature failure during the pressure stroke while allowing the increased stroke length to achieve higher dosing volume
Solution Approach 2:
A support element is introduced as an intermediary component between the membrane and the dosing chamber, providing mechanical support during the pressure stroke to enable longer stroke lengths without compromising membrane service life
2Productivity
If the membrane surface area is increased to increase the dosing volume, then the delivery capacity is improved, but the compactness of the metering pump is reduced
Solution Approach 1:
The invention changes the operational parameters by increasing the stroke length instead of increasing the membrane surface area, allowing the dosing volume to be increased while maintaining the compact pump design
3Productivity
If the core movement is increased to increase the stroke length, then the dosing volume is improved, but the membrane stress is increased leading to premature failure
Solution Approach 1:
The support element acts as an intermediary that shares the mechanical load during the pressure stroke, reducing the stress on the membrane while allowing greater core movement and longer stroke length
Solution Approach 2:
The support element provides preliminary mechanical support during the pressure stroke, preventing excessive membrane stress before failure can occur, thereby enabling increased core movement and stroke length
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
The solution allows for a larger stroke length without premature membrane failure, thereby increasing the dosing volume per stroke while maintaining the compactness and service life of the membrane system.
Implementation Method 1
the flexing section is designed to allow the central section to move back and forth relative to the outer section... the flexing section must deform to enable the back-and-forth movement
Data Source
AI summary
The present invention also relates to a metering diaphragm pump with a membrane system of the type described, or with a corresponding membrane, where the membrane is clamped at its outer section, and the metering diaphragm pump has a cavity that is divided by the membrane into a metering chamber and a working chamber. An actuator is provided, which moves the core back and forth between the first and second positions. Through the inventive measures, the metering diaphragm pump can be designed so that the ratio of the outer diameter of the flexing section to the distance between the first and second positions of the core is less than 15, preferably less than 12.5, particularly preferably less than 10 and greater than 5.