Electroformed Metal Stator Tube for Progressing Cavity Pumps
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Solution Overview
Problem
Conventional progressing cavity apparatuses face limitations in torque capacity, pressure capacity, and durability due to the weakness of elastomeric linings, which absorb heat, swell, and are prone to chemical interactions, affecting the performance and reliability of the apparatus.
Innovation Solution
The method involves electroforming to produce a stator tube with a helical lobed profile, potentially eliminating the need for a thick elastomeric lining by using a metal stator tube with a matching helical lobed inner and outer surface, enhancing the structural integrity and heat dissipation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thick elastomeric lining is used in the stator tube, then the stator can accommodate complex rotor motion and provide sealing, but the apparatus suffers from heat absorption, swelling, and reduced durability
Solution Approach 1:
The patent changes the material parameter from elastomeric to metal (steel or stainless steel), fundamentally altering thermal properties. The metal stator tube eliminates heat absorption and swelling issues while maintaining structural integrity through its inherent material properties, directly resolving the contradiction between durability and heat resistance
Solution Approach 2:
The patent employs a composite structure with a metal stator tube providing structural support and thermal stability. This composite approach allows the stator to maintain rigidity and heat resistance while the helical lobed profile provides the necessary sealing surfaces, combining the benefits of different material properties
2Adaptability or versatility
If a thick elastomeric lining is used in the stator tube, then the stator can accommodate complex rotor motion, but the apparatus experiences swelling and reduced torque capacity
Solution Approach 1:
The patent changes the material from elastomeric to metal, altering mechanical properties including rigidity and dimensional stability. The metal stator tube maintains consistent dimensions under load, preventing swelling that would reduce torque capacity, while the helical lobed profile accommodates rotor motion through geometric design rather than material deformation
Solution Approach 2:
The patent uses a helical lobed profile with specific curvature on the stator tube inner surface. This curved geometry accommodates the eccentric rotor motion by providing continuous contact surfaces that guide the rotor through its complex path, maintaining sealing and torque transmission without requiring thick elastomeric material
3Reliability
If a thick elastomeric lining is used in the stator tube, then the stator can provide sealing, but the apparatus suffers from chemical interactions and reduced pressure capacity
Solution Approach 1:
The patent changes the material composition from elastomeric to metal (particularly stainless steel), fundamentally altering chemical properties. The metal stator tube provides resistance to chemical interactions and corrosion, eliminating the harmful chemical reactions that occur with elastomeric materials while maintaining sealing effectiveness through precise geometric profiling
Solution Approach 2:
The patent uses a metal stator tube that combines structural integrity with chemical resistance. The metal material provides inherent resistance to chemical interactions while the helical lobed profile creates effective sealing surfaces, creating a composite solution that addresses both sealing and chemical compatibility requirements
4Strength
If a conventional stator tube with elastomeric lining is used, then the apparatus can operate, but the structural integrity and heat dissipation properties are insufficient
Solution Approach 1:
The patent changes the material from elastomeric to metal, fundamentally altering thermal and mechanical properties. The metal stator tube provides superior structural integrity through its inherent strength and stiffness, while simultaneously improving heat dissipation through the high thermal conductivity of metal, directly resolving both aspects of the contradiction
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 improves the torque capacity, pressure capacity, and durability of progressing cavity apparatuses by reducing heat absorption and swelling, while providing a more robust and resilient stator tube that can maintain effective sealing and accommodate complex rotor motion.
Implementation Method 1
A method for use in producing a stator for a progressing cavity apparatus includes incorporating a stator tube electroforming mandrel into a cathode of an electrolytic cell; electrodepositing a thickness of a deposited metal onto the stator tube electroforming mandrel as an electroformed deposit
Data Source
AI summary
A method for use in producing a stator for a progressing cavity apparatus which includes the use of electroforming to produce the stator tube. A stator tube for a progressing cavity apparatus which is produced using electroforming and a stator for a progressing cavity apparatus which includes a stator tube produced using electroforming.