Eccentric Screw Pump Power Train With Elastic Recesses
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Solution Overview
Problem
Eccentric screw pumps face challenges with high component count, large installation length, and maintenance issues due to the use of long coupling rods with joints, which are prone to wear and require lubrication.
Innovation Solution
The solution involves a power train consisting of a one-piece rotational body with weakening recesses, allowing for a reversible elasticity that adapts to the eccentricity between the drive shaft and screw conveyor, reducing the number of components and installation length while enhancing durability and maintenance efficiency.
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 the number of components increases
Solution Approach 1:
The patent combines the coupling rod and its joints into a single integrated power train component. The power train is designed as one piece with built-in elastic elements that provide the necessary flexibility for eccentricity accommodation, eliminating the need for separate coupling rods and joints, thereby reducing installation length and component count.
Solution Approach 2:
The power train incorporates elastic elements that function as flexible components, allowing the rigid one-piece structure to adapt to eccentric motion. These elastic elements enable the power train to flexibly accommodate the eccentricity between drive shaft and screw conveyor while maintaining structural integrity.
2Adaptability 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 number of components increases
Solution Approach 1:
The patent merges multiple components (coupling rod, joints, and connecting elements) into a single integrated power train. This one-piece design with embedded elastic elements reduces the component count while maintaining the ability to accommodate eccentricity, thereby simplifying the overall device structure.
Solution Approach 2:
The power train is designed as a multi-functional component that simultaneously performs torque transmission, eccentricity accommodation, and positional adaptation. By integrating these functions into one component, the patent eliminates the need for multiple separate parts, reducing device complexity.
3Adaptability or versatility
If joints are used in the coupling rod, then the connection can accommodate motion differences, but wear risk increases and maintenance is required
Solution Approach 1:
The patent eliminates separate joints by integrating elastic elements directly into the one-piece power train structure. This design removes the joint interfaces that are prone to wear, thereby improving reliability and reducing maintenance requirements while still accommodating motion differences through the elastic deformation of the integrated elements.
Solution Approach 2:
The elastic elements within the power train automatically adapt to motion sequence differences through their inherent elasticity, without requiring external lubrication or maintenance. The self-adjusting elastic deformation accommodates the eccentricity and motion variations, eliminating the need for joint lubrication and reducing wear-related maintenance.
4Device complexity
If a one-piece rotational body with weakening recesses is used for the power train, then the number of components decreases, but production complexity increases
Solution Approach 1:
The power train is designed as a one-piece rotational body with strategically placed weakening recesses. These recesses create segmented-like flexibility zones within the monolithic structure, allowing the component to bend and adapt to eccentric motion. This approach maintains the simplicity of a single component while introducing controlled flexibility through the recess geometry.
Solution Approach 2:
The weakening recesses modify the structural parameters of the power train by creating zones of reduced material density and increased flexibility. This parameter change allows the rigid one-piece structure to exhibit flexible behavior, accommodating eccentricity without requiring multiple components or complex assembly processes.
5Length of stationary object
If the connecting pitch is shortened in the power train, then the installation length decreases, but the stiffness for torque transmission must be maintained
Solution Approach 1:
The power train incorporates elastic elements that provide flexible torque transmission. These elastic components allow the shortened connecting pitch to maintain adequate stiffness for torque transmission while accommodating the reduced length. The elasticity enables the structure to flex under torque loads without compromising strength.
Solution Approach 2:
The power train may utilize composite material structures or hybrid designs combining rigid and elastic materials. This allows the shortened component to maintain the necessary stiffness for torque transmission in critical areas while having flexible sections for adaptation, achieving both compact length and sufficient strength.
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 design significantly reduces production costs, maintenance effort, and the risk of wear, while maintaining the necessary stiffness for torque transmission, even with shortened connecting pitches.
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.