Encapsulated Magnetic Ring Rotor for Caustic Fluid Impeller Balancing

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Solution Overview

Problem

Traditional impellers operating at high rotational speeds in caustic environments face challenges due to the need for balancing, which is time-consuming and costly, and are prone to failure from human error, while corrosive fluids degrade components and magnets, leading to operational issues.

Innovation Solution

A rotatable impeller assembly with a sealed magnetic ring and locked structural components, where the magnetic ring is fixed in position relative to the rotor cup and impeller, eliminating the need for periodic balancing and protecting the magnetic ring from corrosive fluids through a hermetic seal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If traditional impellers are used in caustic environments, then they can operate at high rotational speeds, but they require time-consuming balancing operations and are prone to failure from human error

Engineering Contradiction:

Improverotational speedVSAvoidbalancing time

Core Design Contradiction:

SpeedVSLoss of time

Solution Approach 1:

The magnetic ring automatically balances the rotor assembly through its magnetic coupling with the impeller, eliminating the need for manual balancing operations. The system self-adjusts to achieve balanced rotation without human intervention or secondary assembly operations.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The magnetic ring is hermetically sealed between the impeller and rotor cup, merging multiple functions (sealing, balancing, and structural support) into a single integrated component, thereby eliminating separate balancing operations and reducing assembly steps.

Inventive Principle:

Principle #5Merging (Combining)

2Adaptability or versatility

If traditional impellers are used in caustic environments, then they can pump corrosive fluids, but the corrosive fluids degrade components and magnets leading to operational issues

Engineering Contradiction:

Improvefluid compatibilityVSAvoidcomponent durability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

A hermetic seal is formed between the impeller and rotor cup, creating a protective barrier that prevents corrosive fluids from reaching and degrading the magnetic ring and other internal components, thereby maintaining reliability in caustic environments.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The hermetic seal acts as an intermediary barrier between the corrosive external environment and the sensitive internal components, protecting the magnetic ring and bearing from direct contact with degrading fluids.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If traditional impellers require balancing operations, then quiet operation can be achieved, but secondary assembly operations increase manufacturing costs and assembly error

Engineering Contradiction:

Improvequiet operationVSAvoidassembly complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The magnetic ring automatically balances the rotor assembly through magnetic coupling, eliminating the need for secondary balancing operations and skilled handling during assembly, thereby reducing manufacturing complexity and potential assembly errors.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The magnetic ring is pre-positioned and hermetically sealed between the impeller and rotor cup during initial assembly, establishing automatic balancing capability before the assembly enters service, eliminating the need for subsequent balancing operations.

Inventive Principle:

Principle #10Preliminary action

4Device complexity

If the magnetic ring is not sealed, then the assembly structure is simpler, but corrosive fluids cause wear on components in continuous operation

Engineering Contradiction:

Improvesealing structureVSAvoidcomponent protection

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

Inventive Principle:

Principle #30Flexible shells and thin films

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 assembly automatically balances the impeller assembly, ensuring quiet operation and longevity of the rotor assembly, while providing a more versatile rotor capable of being run in a broad range of fluids.

Implementation Method 1

The magnetic ring is held in position by the impeller and the rotor cup

Methodology Applied

Scientific EffectMagnetic attraction: Magnetism

Data Source

PatentEP3931446B1Rotor having an encapsulated magnetic ring for use in caustic environments

Publication Date: 2025.12.17 VAPOTHERM INC

Figure 1A~1B
Figure 2
Figure 3~4

AI summary

There is provided a rotatable impeller assembly for pumping caustic fluid by products in a medical device. The assembly comprises a rotor having a rotor cup, and an impeller having a rotor contacting surface and impeller blades. The assembly further comprises a magnetic ring seated within the cup. The magnetic ring comprises a first contact surface that is configured to mate with an inner surface of the cup, and a second contact surface that is configured to mate with the rotor contacting surface of the impeller. In such an arrangement, the magnetic ring is locked in position by the rotor cup and the impeller, thereby preventing any independent rotation of the magnetic ring relative to the rotor and the impeller while automatically balancing the rotor. Further, the rotor contacting surface of the impeller is attached to the cup to hermetically seal the magnetic ring within the impeller assembly.