Side Channel Pump Gas Recirculation Magnetic Coupling

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Solution Overview

Problem

Existing gas recirculation devices face issues with maintenance, scalability, efficiency, and high manufacturing costs due to friction, wear, and complex designs, particularly in diaphragm and rotary vane compressors, while dual-shaft systems like Roots compressors have limited scalability and high costs.

Innovation Solution

A side channel pump with a simple and cost-effective design, offering friction-free operation, adaptability through rotational speed and geometry adjustments, and long service life, utilizing a single shaft and various material combinations, and incorporating a hermetic seal for corrosive media handling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If diaphragm compressors or rotary vane compressors are used, then gas recirculation is achieved, but friction and wear occur requiring regular maintenance

Engineering Contradiction:

Improveservice lifeVSAvoidmaintenance frequency

Core Design Contradiction:

ReliabilityVSEase of repair

Solution Approach 1:

The patent replaces traditional mechanical compression systems (diaphragm compressors, rotary vane compressors) with a magnetic coupling system where a magnetic rotor in the drive unit transfers rotational motion to a magnetic impeller in the compression chamber without mechanical contact. This eliminates friction and wear between moving parts, achieving friction-free operation and extending service life while reducing maintenance requirements.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If dual-shaft compressors such as Roots compressors are used, then gas recirculation is achieved, but manufacturing costs are considerably higher

Engineering Contradiction:

Improverecirculation performanceVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces complex dual-shaft mechanical systems with a single-drive-unit magnetic coupling system. The magnetic rotor in the drive unit directly couples to the magnetic impeller, eliminating the need for dual shafts, synchronous gears, and complex mechanical synchronization mechanisms, thereby significantly reducing manufacturing costs while maintaining recirculation performance.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent extracts and eliminates unnecessary mechanical components from the compression system. By using magnetic coupling, the design removes dual shafts, gear trains, and synchronization mechanisms, keeping only the essential magnetic rotor and magnetic impeller, thus simplifying the overall system and reducing manufacturing complexity and cost.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If Roots compressors are used, then gas recirculation is achieved, but the construction size is relatively large

Engineering Contradiction:

Improverecirculation capabilityVSAvoidconstruction size

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The patent replaces the bulky dual-shaft mechanical system with a compact magnetic coupling system. The magnetic rotor and magnetic impeller can be designed in various configurations (radial, axial, or mixed flow) to optimize for compactness, significantly reducing the construction size while maintaining recirculation capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent uses a magnetic coupling system that allows for flexible and dynamic design configurations. The magnetic rotor and magnetic impeller can be optimized for different flow patterns and sizes, enabling compact designs that adapt to specific application requirements, thereby reducing overall construction size.

Inventive Principle:

Principle #15Dynamics

4Reliability

If Roots compressors are used, then gas recirculation is achieved, but efficiency is relatively low due to considerable gap losses

Engineering Contradiction:

Improverecirculation functionVSAvoidgap losses

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent replaces the mechanical compression system with a magnetic coupling system where the magnetic impeller induces a magnetic field that directly acts on the gas molecules. This magnetic field interaction eliminates the need for large mechanical gaps, significantly reducing gap losses and improving energy efficiency while maintaining the recirculation function.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 side channel pump provides efficient gas recirculation with low maintenance and operational costs, enabling precise pressure and flow rate adjustments, and is suitable for a wide range of applications with reduced manufacturing and operational expenses.

Implementation Method 1

The drive unit has a magnetic rotor that can be rotated in a hermetic seal. The compression chamber has a magnetic impeller that is rotationally coupled to the magnetic rotor in a contactless manner

Methodology Applied

Scientific EffectMagnetic coupling: Magnetic Field

Data Source

PatentUS11542935B2Gas recirculation device and system having such a device

Publication Date: 2023.01.03 PFEIFFER VACUUM GMBH

AI summary

The invention relates to a recirculation device for a gas of a process device, said recirculation device comprising a recirculation pump, wherein the recirculation pump is a side channel pump.