Metallic Stator Core for High-Temperature Eccentric Screw Pumps
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Solution Overview
Problem
Eccentric screw pumps face limitations with stators made of elastomer materials that degrade at high temperatures and have different expansion coefficients than steel rotors, leading to operational issues and reduced durability.
Innovation Solution
A stator for eccentric screw pumps comprising a stator core made of metallic or technical ceramic materials, split into radially separable core parts, which are shrink-fitted into a metallic stator casing without adhesives, ensuring a secure and temperature-resistant assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stator is made of elastomer material, then it provides good sealing and flexibility, but it cannot withstand high temperatures and has different expansion coefficients causing operational issues
Solution Approach 1:
The stator is constructed as a composite structure with a metallic or technical ceramic core providing high-temperature resistance, and an elastomer layer applied to the outer surface providing sealing and flexibility. This composite design combines the advantages of both materials while mitigating their individual disadvantages.
Solution Approach 2:
The stator is divided into two functional segments: an inner core structure made of temperature-resistant material and an outer elastomer layer. This segmentation allows each part to perform its optimal function - the core withstands thermal stress while the elastomer provides sealing.
2Reliability
If a stator is made of elastomer material, then it provides good sealing, but the different expansion coefficients with steel rotors lead to wear and reduced durability
Solution Approach 1:
The metallic or technical ceramic core provides dimensional stability and consistent expansion characteristics that match better with steel rotors, reducing wear. The elastomer layer maintains sealing performance while the composite structure overall improves durability through reduced thermal expansion mismatch.
3Strength
If a complete stator core is produced as one piece, then it ensures structural integrity, but it creates manufacturing difficulties and limits accessibility for assembly and maintenance
Solution Approach 1:
The stator core is divided into multiple separable parts that can be manufactured independently using standard metal-cutting operations, then assembled together. This segmentation simplifies manufacturing and allows for easier assembly and maintenance while maintaining structural integrity through precise joining of the segments.
4Ease of manufacture
If a stator core is split into separable parts, then it improves ease of manufacture and accessibility, but it may compromise structural integrity and precision of the inner contour
Solution Approach 1:
The stator core is divided into segments with precisely machined mating surfaces and positioning elements such as pins and recesses. These positioning features ensure accurate alignment of the segments during assembly, maintaining the precision of the inner contour while allowing each segment to be manufactured separately with standard operations.
Solution Approach 2:
Positioning pins and recesses act as intermediary elements between the stator core segments, ensuring precise alignment and maintaining the accuracy of the inner contour. These intermediaries facilitate the connection of segments while guaranteeing the required manufacturing precision.
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 provides a reliable and efficient stator that maintains a consistent spacing between rotor and stator, enabling operation at high temperatures and reducing wear, with improved precision and efficiency in transporting media.
Implementation Method 1
the at least two radially separable core parts are each made from a metallic material or a technical ceramic material, which possess material-resistance even in a higher temperature range
Implementation Method 2
a reliable and efficient stator that maintains a consistent spacing between rotor and stator, enabling operation at high temperatures
Data Source
AI summary
A stator for an eccentric screw pump with an internal hollow space with a helically coiled inner contour for accommodating a rotor. The stator includes a stator core arranged in a stator casing, which stator core includes at least two radially separable core parts. According to the invention, the at least two radially separable core parts are each made from a metallic material or a technical ceramic material. The stator casing is a stator tube and is made of a metallic material. The stator casing is shrink-fitted onto the stator core. The invention also relates to an eccentric screw pump and a method for producing a stator.