Magnetic Drive Progressing Cavity Pump with Wobble Stator

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Solution Overview

Problem

Progressing cavity pumps face challenges in handling corrosive or caustic chemicals due to inadequate sealing and fluid isolation, leading to potential material leakage and equipment damage.

Innovation Solution

A progressing cavity pump design incorporating a magnetic drive system and wobble stator configuration, with fluid isolation through a shroud and seals, allows for the rotation of the driven component relative to the stator, ensuring efficient pumping of corrosive materials without direct mechanical connections, thus preventing leakage and enhancing pump integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a magnetic drive system with fluid isolation is used, then reliability is improved by preventing corrosive material leakage, but device complexity increases due to additional components like shrouds and seals

Engineering Contradiction:

Improveprevention of corrosive material leakageVSAvoidadditional sealing and isolation components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces direct mechanical connections between the drive system and the rotor with a magnetic coupling system. The drive component magnetically couples to the driven component across a fluid barrier, eliminating the need for mechanical seals while maintaining reliable power transmission and preventing corrosive material leakage.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a magnetic field as an intermediary between the drive component and driven component. This magnetic coupling allows power transmission across the fluid isolation barrier created by the shroud and seals, enabling reliable operation without direct mechanical contact that would compromise the seal.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If direct mechanical connections are used for drive transmission, then device complexity is reduced, but reliability deteriorates due to potential leakage and wear from mechanical seals

Engineering Contradiction:

Improvedrive transmission mechanismVSAvoidsealing integrity with corrosive materials

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent substitutes mechanical seal systems with a magnetic coupling system. The drive component and driven component are coupled magnetically across a non-contact barrier, eliminating wear and leakage issues associated with mechanical seals while maintaining reliable power transmission.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent uses a magnetic field as an intermediary to transmit rotational force across the fluid isolation barrier. This allows the driven component to be rotated without direct mechanical connection, preventing corrosive material leakage while maintaining drive transmission efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If mechanical seals are used to isolate fluids, then fluid isolation is achieved, but wear increases due to contact between sealing surfaces

Engineering Contradiction:

Improvefluid isolation capabilityVSAvoidservice life of sealing components

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The patent replaces contact-based mechanical seals with a non-contact magnetic coupling system. The drive component magnetically actuates the driven component across a fluid barrier without physical contact, eliminating wear on sealing surfaces while maintaining effective fluid isolation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a magnetic field as an intermediary that transmits rotational motion across the fluid isolation barrier without requiring physical contact between components. This eliminates wear on sealing surfaces while maintaining reliable fluid isolation and extending the service life of the pump.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 magnetic drive system and wobble stator configuration effectively isolate fluids, preventing corrosive material leakage and reducing wear, while maintaining pump efficiency and integrity, even when handling aggressive chemicals.

Implementation Method 1

a magnetic drive system and wobble stator configuration, with fluid isolation through a shroud and seals, allows for the rotation of the driven component relative to the stator

Methodology Applied

Scientific EffectMagnetic coupling: Magnetism

Data Source

PatentUS7553139B2Progressing cavity pump with wobble stator and magnetic drive

Publication Date: 2009.06.30 MOYNO INC

AI summary

A progressing cavity pump including a drive component configured to be rotated by a motor and a driven component that is magnetically rotationally coupled to the drive component. The driven component is fluidly isolated from the drive component. The pump further includes a wobble stator and a rotor positioned inside the stator and configured such that rotation of the driven component causes relative rotation between the rotor and the stator, which in turn causes material in the pump to be pumped therethrough.