Dosing Pump Diaphragm Prestressing for Low-Pressure Operation
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Solution Overview
Problem
Dosing pumps with conventional diaphragms suffer from premature rupture due to alternate bending and require minimum pressure for reliable operation, limiting their application to higher fluid pressures.
Innovation Solution
A prestressing device is used to maintain constant loading on the diaphragm, eliminating alternate bending by applying a force in the same direction in both positions, allowing hydraulic operation at low fluid pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the dosing diaphragm is clamped at edge regions and alternately bent during operation, then the pump can deliver dosing medium, but the diaphragm suffers from notching, cracking and premature rupture
Solution Approach 1:
The patent applies a prestressing force to the dosing diaphragm that maintains constant tension throughout the entire pumping cycle. This parameter change transforms the diaphragm's stress state from alternating tension-compression cycles to continuous tension, eliminating the harmful alternate bending effect that causes material fatigue and premature failure while preserving the pump's delivery function
2Ease of operation
If hydraulic pressure is increased to move the dosing diaphragm to the first position, then movement is easily implemented, but a minimum pressure must be applied at the suction connection to ensure reliable return movement
Solution Approach 1:
The patent introduces a prestressing device that applies a counteracting force to balance the hydraulic pressure forces. This prestressing force acts as a counterweight that enables the dosing diaphragm to return to the second position even when dosing fluid pressures are very low, thereby expanding the pump's applicability to low-pressure applications while maintaining ease of operation
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 prestressing device extends the diaphragm's service life and enables hydraulic operation at very low dosing fluid pressures by maintaining consistent stress, preventing premature rupture and ensuring reliable pump function.
Implementation Method 1
The prestressing device is configured to prestress the dosing diaphragm with a prestressing force having a prestressing effect on the dosing diaphragm in the first and/or second position
Implementation Method 2
the device for reciprocating movement of the dosing diaphragm is a hydraulic device, wherein a hydraulic fluid is arranged in the working chamber, wherein the hydraulic device is of a such a design configuration that it can act on the hydraulic fluid with a hydraulic pressure to move the dosing diaphragm in the direction of the first position
Data Source
AI summary
The present invention concerns a dosing pump comprising a dosing chamber, a working chamber and a dosing diaphragm, wherein the dosing chamber and the working chamber are separated from each other by the dosing diaphragm, wherein there is provided a device for reciprocating movement of the dosing diaphragm between a first position and a second position, wherein the volume of the dosing chamber is smaller in the first position than in the second position. To provide a dosing pump, the dosing diaphragm of which has an increased service life and which as far as possible can be hydraulically operated even at very low dosing fluid pressures at the suction side it is proposed according to the invention that there is provided a prestressing device which prestresses the dosing diaphragm in the direction of the first or second position.