Modular Progressive Cavity Stator Assembly for Wear and Sealing
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Solution Overview
Problem
Existing stators for progressive cavity devices, particularly metal and elastomeric stators, face challenges such as abrasive wear, complex manufacturing processes, limited material options, and high maintenance costs due to frequent replacement and refurbishment, especially when handling viscous fluids and solids.
Innovation Solution
The development of modular stator segments that are bolted together, allowing for easier assembly, reduced manufacturing complexity, and the use of various materials, including metals and elastomers, with integrated locating features and compressible gaskets for sealing, enabling on-site replacement of worn segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional metal stators are used, then structural strength is improved, but abrasive wear resistance deteriorates due to frequent replacement needs
Solution Approach 1:
The stator is divided into multiple modular segments that can be independently replaced. Each segment is a discrete component with standardized connection features, allowing only the worn portion to be replaced rather than the entire stator, thus extending overall service life while maintaining structural strength.
Solution Approach 2:
The stator employs composite construction combining metal segments with elastomer lining. The metal provides structural strength while the elastomer layer provides wear resistance and flexibility, creating a composite structure that overcomes the limitations of pure metal stators.
2Reliability
If elastomer-lined stators are used, then wear resistance is improved, but structural strength deteriorates
Solution Approach 1:
The stator uses composite construction with metal segments providing structural strength and elastomer lining providing wear resistance. This layered composite structure allows each material to contribute its advantageous properties to the overall system.
Solution Approach 2:
Different portions of the stator have different material properties optimized for their specific functions. The metal segments provide structural strength where needed, while the elastomer lining provides wear resistance at the critical internal surface, creating local quality optimization.
3Ease of repair
If modular stator segments are used, then ease of repair is improved, but device complexity increases
Solution Approach 1:
The stator is segmented into standardized modular units with uniform connection interfaces. This segmentation enables simple replacement procedures where worn segments can be swapped without complex disassembly, though it does increase the number of individual components.
Solution Approach 2:
The modular segments are designed with universal connection features and standardized interfaces that allow them to be interchanged in various positions. This universality simplifies repair operations as any segment can replace any other, reducing the complexity of repair procedures despite the increased number of components.
4Manufacturing precision
If traditional stator manufacturing processes are used, then manufacturing precision is improved, but ease of manufacture deteriorates due to complex processes
Solution Approach 1:
The stator manufacturing process is segmented into separate operations for producing individual segments and then assembling them. This allows each segment to be manufactured with high precision using standardized processes, while the overall assembly becomes simpler and more flexible compared to manufacturing a monolithic stator.
Solution Approach 2:
The modular segments are pre-manufactured and pre-assembled with connection features before final assembly. This preliminary preparation simplifies the overall manufacturing process by breaking down complex operations into manageable steps, while maintaining dimensional precision through controlled manufacturing of individual components.
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 approach reduces manufacturing steps, extends stator life, minimizes waste, and enhances performance by providing a smoother helical profile, better sealing, and allows for easier maintenance and upgradability, while supporting dry operation with improved sealing and reduced leakage.
Implementation Method 1
compressible gaskets for sealing
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A stator is provided for a progressive cavity device. The stator includes modular stator segments connected together. Each stator segment includes a front surface, a rear surface, and an internal helical cavity extending longitudinally from the front surface to the rear surface. Each stator segment also includes a set of bolt holes extending longitudinally from the front surface to the rear surface, and a set of connection holes opening at the front surface and extending at least partially longitudinally from the front surface to the rear surface. Bolts, inserted through the bolt holes into connection holes of an adjacent stator segment, connect the stator segments and align the internal helical cavities to form a continuous helical chamber.