Eccentric Screw Pump Power Train With Weakening Recesses
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Solution Overview
Problem
Eccentric screw pumps face issues with high component count, large installation length, wear risk, and maintenance needs due to traditional coupling rods and joints, which are costly and prone to lubricant contamination.
Innovation Solution
A one-piece rotational body power train with radial weakening recesses provides elasticity and adapts to eccentricity, eliminating external joints and reducing components, production costs, and maintenance, using 3D printing for polymer or metal materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a long coupling rod with joints is used to connect drive shaft and screw conveyor, then the connection can accommodate eccentricity, but the installation length increases and wear risk increases
Solution Approach 1:
The coupling rod is segmented into multiple sections that can articulate relative to each other, allowing the overall length to be reduced while maintaining the ability to accommodate eccentricity through joint movement
Solution Approach 2:
The coupling rod and its mounting brackets are merged into a single integrated component, eliminating the need for separate joints and reducing the overall installation length while maintaining eccentricity adaptation capability
2Adaptability or versatility
If coupling rods with joints are used, then eccentricity can be adapted, but the number of components increases and maintenance effort increases
Solution Approach 1:
Multiple separate components (coupling rod, mounting brackets, joints) are merged into a single integrated power train component, reducing the number of parts while maintaining the ability to adapt to eccentricity through the articulated design of the integrated structure
Solution Approach 2:
The integrated power train component performs multiple functions simultaneously: it transmits torque, accommodates eccentricity, and provides structural support, eliminating the need for separate specialized components
3Force
If traditional coupling rods are used, then torque can be transmitted, but wear risk increases and lubrication is required
Solution Approach 1:
The power train component is designed to self-lubricate through material selection and surface treatment, eliminating the need for external lubrication systems and reducing wear without requiring maintenance intervention
Solution Approach 2:
The power train component utilizes porous materials or surface structures that retain lubricant internally, providing continuous self-lubrication and reducing wear while eliminating the need for external lubrication points
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 achieves a high-capacity, cost-effective connection between the drive shaft and screw conveyor, minimizing wear and maintenance, while ensuring torque transmission and flexibility.
Implementation Method 1
The weakening recesses are designed so that they provide the power train with that reversible elasticity, which it requires in order to rotate about an axis of rotation, which curves in a periodically recurring manner at least in sections
Data Source
AI summary
Eccentric screw pump with a rotor of a drive shaft circulating essentially about a fixed axis in relation to the stator in a bearing block, a power train and a screw conveyor, which revolves in a rotating-oscillating manner in a screw flight of the stator, wherein the power train provides the screw conveyor with its drive torque and the power train adjusts the differences of the motion sequences of the screw conveyor and of the drive shaft, wherein the power train consists essentially of a one-piece rotational body, which has multiple weakening recesses, which interrupt its outer circumferential jacket surface more than only insignificantly and which provide it with that reversible elasticity, which it requires in order to rotate about an axis of rotation, which curves in a periodically recurring manner at least in sections.