Progressive Cavity Pump Stator Assembly Without Welding
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Solution Overview
Problem
The production of progressive cavity fluid pumps is complex, expensive, and time-consuming due to the intricate assembly of rotors and stators with different numbers of helical lobes.
Innovation Solution
The use of multi-section stators with rotational indexing and alignment techniques, such as deformation of the housing to form protrusions in recesses, and the application of a lining to enhance sealing and reduce friction, allows for efficient assembly of stator sections in a tubular housing without welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional progressive cavity fluid pump assembly methods are used, then the pump achieves functional performance, but the production process is complex, expensive, and time-consuming
Solution Approach 1:
The stator is divided into multiple stator sections that can be assembled separately and then connected together. Each stator section contains a portion of the helical lobes, and they are joined using coupling devices or overlapping configurations. This segmentation simplifies manufacturing by allowing modular production while maintaining the required precision through standardized connection interfaces.
Solution Approach 2:
The stator sections are pre-assembled and pre-aligned before final installation in the pump housing. Indexing features and alignment mechanisms are incorporated into the stator sections during manufacturing, ensuring that when they are connected, the helical lobes align precisely without requiring complex post-assembly adjustments.
2Productivity
If multi-section stators with rotational indexing are used, then assembly is simplified and production time is reduced, but additional components and alignment mechanisms are required
Solution Approach 1:
The indexing features, alignment mechanisms, and connection elements are merged into integrated coupling devices that connect adjacent stator sections. These coupling devices simultaneously perform multiple functions: mechanical connection, rotational indexing, and axial positioning, thereby simplifying the overall component count while enabling rapid assembly.
Solution Approach 2:
The stator sections are designed with universal coupling interfaces that can accommodate different numbering configurations and rotational positions. The indexing features are standardized across all sections, allowing any section to be connected to any other section in any rotational position, which simplifies assembly procedures and reduces the need for specialized 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 method simplifies the construction process, extends the useful life of the fluid motor, and enhances sealing and efficiency by reducing metal-to-metal contact and friction, thereby improving the overall performance of the fluid pump.
Implementation Method 1
at least one deformation of the housing secures each respective stator section in the housing
Implementation Method 2
enhances sealing and efficiency by reducing metal-to-metal contact and friction
Data Source
AI summary
A fluid pump can include a tubular housing and multiple stator sections. Each of the stator sections has a helical stator profile formed therein. Deformation of the housing secures each respective stator section in the housing. A method of producing a fluid pump can include securing multiple stator sections to each other, each of the stator sections having a stator profile formed therein, and securing the stator sections in a tubular housing. The securing steps can be performed without any welding. The step of the securing the stator sections in the housing can include deforming the housing toward the stator sections.