Concentric Rotor Stator Pump Layout for Stable Progressing Cavities
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Solution Overview
Problem
Existing rotor stator pumps face inefficiencies in material displacement due to the interaction between the helical rotor and stator components, leading to challenges in maintaining consistent cavity formation and material flow.
Innovation Solution
The introduction of a helical rotor rod that rotates relative to a pump stator, driven by an electric motor, forms a series of progressing cavities to efficiently displace material, with additional components like outer and inner drives, dynamic seals, and a funnel to direct material flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a helical rotor rotates relative to a stator to displace material, then material pumping function is achieved, but inconsistent cavity formation and material flow occur
Solution Approach 1:
The rotor is segmented into multiple lobes that create distinct cavities along the stator, with each lobe forming a separate progressing cavity. This segmentation ensures consistent material displacement through multiple independent cavity formations simultaneously, improving both productivity and reliability of cavity formation.
Solution Approach 2:
The helical rotor is nested within the lobed stator, with the rotor rotating inside the stator's cavity channel. This nested configuration allows the rotor to form progressing cavities within the stator's defined flow path, ensuring consistent material flow while maintaining efficient displacement through the nested interaction between rotor and stator surfaces.
2Productivity
If the rotor and stator interact to pump material, then material flow is achieved, but leakage occurs between components
Solution Approach 1:
The stator is designed with a flexible lobed structure that conforms to the rotor surface, creating dynamic sealing between the rotor and stator. This flexible shell configuration allows the stator lobes to maintain intimate contact with the rotor, preventing material leakage while accommodating operational variations, thus improving material flow efficiency and reducing energy loss.
Solution Approach 2:
The rotor and stator surfaces feature complementary curved geometries with precise radii relationships. The curved surfaces create continuous progressing cavities that maintain consistent sealing along the entire length of the pump, preventing leakage while enabling smooth material flow through the curved cavity paths.
3Power
If an electric motor drives the rotor, then rotation is achieved, but radial space requirements increase
Solution Approach 1:
The electric motor is nested concentrically around the rotor, with the motor's rotor positioned radially outward from the pump rotor. This nested motor configuration allows the drive system to be integrated within the existing radial envelope, providing full motor power capability without increasing the overall radial dimensions of the pump assembly.
Solution Approach 2:
The motor shaft is merged with or directly coupled to the pump rotor, combining the drive function and pumped function into a single integrated rotating assembly. This merging eliminates intermediate transmission components that would occupy radial space, allowing the electric motor to drive the rotor efficiently within compact radial dimensions.
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
Enhances material displacement efficiency by maintaining consistent cavity formation and reducing leakage, allowing for effective pumping of materials through the rotor stator pump.
Implementation Method 1
a motor stator disposed around the motor rotor to electromagnetically drive rotation of the motor rotor
Data Source
AI summary
A rotor stator pump includes a rotating helical component and a static helical component. An electric motor is connected to the rotating helical component to drive rotation of the rotating helical component. The rotating helical component and the static helical component are disposed radially inward of the motor rotor of the electric motor.