Progressive Cavity Stator Assembly Without Welding

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

The production of progressive cavity assemblies, such as Moineau-type fluid pumps and motors, is complex and time-consuming, and there is a need for advancements in designing and constructing these assemblies for various fluid flow applications.

Innovation Solution

A method for producing a progressive cavity assembly involving the use of stator sections with internal helical lobes, secured in a housing through deformation, rotational indexing, and optional lining to enhance sealing and durability, without requiring welding, and utilizing materials like metals and elastomers for improved performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If traditional welding methods are used to assemble progressive cavity components, then structural strength is improved, but manufacturing complexity and production time increase

Engineering Contradiction:

Improvestructural strengthVSAvoidmanufacturing complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent replaces welding (a thermal/mechanical joining process) with mechanical interference fits and deformation-based securing methods. The stator section is secured in the housing through deformation that creates interference fits, eliminating the need for welding operations while maintaining structural integrity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the joining method from permanent thermal welding to reversible mechanical deformation. By deforming the housing or stator section to create interference fits, the assembly achieves structural strength through mechanical parameters rather than thermal processes, simplifying manufacturing.

Inventive Principle:

Principle #35Parameter changes

2Strength

If welding is required for assembly, then joint strength is improved, but material selection is limited to weldable materials

Engineering Contradiction:

Improvejoint strengthVSAvoidmaterial selection flexibility

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The patent substitutes welding with mechanical deformation and interference fit methods, enabling the use of non-weldable materials such as certain elastomers, polymers, or exotic alloys that cannot be joined by welding but can be securely assembled through mechanical deformation and interference fits.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Manufacturing precision

If multiple production steps are used to ensure precision alignment, then rotational alignment accuracy is improved, but production time increases

Engineering Contradiction:

Improverotational alignment accuracyVSAvoidproduction time

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent incorporates preliminary alignment features directly into the stator section and housing design, such as keyed interfaces or pre-positioned deformation zones, that automatically establish precise rotational alignment during the deformation securing process, eliminating the need for separate alignment steps.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent combines multiple functions into a single operation: the deformation process simultaneously secures the stator section in the housing and establishes precise rotational alignment, merging what would traditionally be separate alignment and securing steps into one integrated process.

Inventive Principle:

Principle #5Merging (Combining)

4Reliability

If complex assembly procedures are used to secure stator sections, then sealing performance is improved, but ease of manufacture decreases

Engineering Contradiction:

Improvesealing performanceVSAvoidease of manufacture

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The deformation process creates self-sealing interference fits where the deformed housing or stator section automatically forms sealing contact with adjacent components through the deformation itself, eliminating the need for separate sealing operations or complex assembly procedures.

Inventive Principle:

Principle #25Self-service

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 method enhances the durability and efficiency of fluid motors and pumps by ensuring precise rotational alignment and sealing, reducing production complexity and cost, and allowing for the use of non-weldable materials.

Implementation Method 1

At least one deformation of the housing secures the stator section in the housing

Methodology Applied

Scientific EffectDeformation: Deformation

Data Source

PatentUS20260063000A1Progressive cavity assembly and associated methods

Publication Date: 2026.03.05 THRU TUBING SOLUTIONS INC

AI summary

A progressive cavity assembly can include a stator having a tubular housing and a stator section having a helical stator profile formed therein. At least one deformation of the housing secures the stator section in the housing. A method of producing a progressive cavity assembly can include providing a stator section having a stator profile formed therein, and securing the stator section in a tubular housing. The step of securing the stator section in the housing can be performed without any welding. The step of securing the stator section in the housing can include deforming the housing toward the stator section.