Split Stator Progressing Cavity Pump for Sanitary Maintenance
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Solution Overview
Problem
Progressing cavity pumps face challenges in efficiently handling viscous and shear-sensitive materials due to limitations in stator design, which can lead to clogging and maintenance difficulties, particularly in sanitary applications where seamless and leak-proof surfaces are crucial.
Innovation Solution
A split stator design with radially separable portions allows for easy access and maintenance, combined with a unitary feeder assembly that reduces seams and friction losses, ensuring efficient pumping of viscous materials and maintaining sanitary conditions by eliminating dead spaces and crevices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If a traditional solid stator design is used, then the pump structure is simple and manufacturing is easier, but maintenance accessibility is poor and clogging risks increase
Solution Approach 1:
The stator is divided into multiple separable portions (typically two half-sections) that can be detached from each other. This segmentation allows the rotor to be accessed and maintained by simply separating the stator portions, eliminating the need to disassemble the entire pump. The segmented design directly resolves the contradiction by improving maintenance accessibility while maintaining relatively simple manufacturing processes for each individual portion.
Solution Approach 2:
The rotor is extracted from the enclosed stator structure by allowing the stator portions to be removed or opened. This extraction principle enables direct access to the rotor for maintenance and cleaning operations without requiring complete pump disassembly, thereby improving maintenance accessibility while keeping the overall device structure relatively simple.
2Reliability
If a traditional stator design with seams is used, then manufacturing is easier, but leakage points increase and sanitary integrity deteriorates
Solution Approach 1:
The stator is segmented into portions that can be manufactured separately and then joined together. This allows each portion to be manufactured with high precision and smooth surfaces, and when assembled, the joints can be designed to minimize leakage points. The segmentation principle resolves the contradiction by enabling better sanitary integrity through controlled assembly while maintaining manufacturing feasibility.
Solution Approach 2:
Multiple stator portions are merged or joined together to form the complete stator structure. The joining mechanism is designed to create seamless or minimal-seam connections that maintain sanitary integrity and prevent leakage. This merging principle allows the system to achieve high reliability for sanitary applications while keeping individual manufacturing steps manageable.
3Ease of operation
If the stator is designed as a single piece, then structural integrity is higher, but maintenance difficulty increases
Solution Approach 1:
The stator is divided into multiple sections that can be separated for maintenance operations. Each segment maintains sufficient structural integrity through proper design of joining mechanisms, while the overall system allows easy maintenance access. This segmentation directly addresses the contradiction by improving maintenance ease while preserving necessary structural strength through engineered connections.
Solution Approach 2:
The stator is pre-designed with built-in separation mechanisms or detachable joints that allow easy disassembly for maintenance. These preliminary design features ensure that when maintenance is needed, the stator can be quickly opened without compromising the structural integrity that was established during normal operation. This preliminary action principle resolves the contradiction between maintenance ease and structural strength.
4Productivity
If a unitary feeder assembly is used, then volumetric efficiency improves and leakage points are reduced, but manufacturing complexity increases
Solution Approach 1:
Multiple feeder components are merged into a single unitary assembly that eliminates internal seams and reduces leakage points. This integrated design improves volumetric efficiency by creating a more streamlined flow path. The manufacturing complexity is managed by designing the unitary structure to be manufacturable as a single piece or pre-assembled module, resolving the contradiction between productivity improvement and manufacturing feasibility.
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 split stator design enhances maintenance accessibility and reduces clogging risks, while the unitary feeder assembly improves volumetric efficiency and sanitary integrity by minimizing leakage points and friction, effectively handling a wide range of viscosities and materials.
Implementation Method 1
A typical progressing cavity pump (also known as a helical gear pump) includes a rotor having one or more externally threaded helical lobes which cooperate with a stator having an internal bore extending axially therethrough. The bore includes a plurality of helical grooves that forms a plurality of cavities with the stator. As the rotor turns within the stator, the cavities progress from the suction end (i.e., inlet) of the pump to the discharge end (i.e., outlet) of the pump.
Data Source
AI summary
A progressing cavity pump system including a rotor and a stator having an inner cavity. The rotor is rotationally disposed inside the inner cavity of the stator such that rotation of the rotor relative to the stator causes material in the inner cavity to be pumped through the stator. The stator includes at least two radially separable stator portions such that when at least one of the stator portions is removed, at least one of the rotor or the inner cavity is exposed.