Magnetic Mixing Device for Viscous Fluids

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Solution Overview

Problem

Current mixing devices are inadequate for achieving a homogeneous mixture of a wide range of viscous fluids, powdery, liquid, and smectic or isotropic materials, often resulting in slow and insufficient mixing, especially with higher viscosities and non-Newtonian flow behaviors.

Innovation Solution

A mixing device with a laterally introduced stirrer at the bottom, allowing for efficient mixing of various fluids with different viscosities, featuring a compact design, easy movement, and a bottom drain valve for complete emptying, along with a smooth interior surface and optional baffles for enhanced mixing and turbulence.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a mechanical stirring device is immersed in the vessel to force mixing, then mixing effectiveness is improved, but particle generation and mechanical damage to components occur

Engineering Contradiction:
Improvemixing effectivenessVSAvoidparticle generation and mechanical damage
Core Design Contradiction:
ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the traditional mechanical stirring device with a magnetic field-based mixing system. Magnets are positioned on the inner surface of the vessel wall, creating magnetic fields that interact with magnetizable particles or droplets in the mixture, generating rotational motion without direct mechanical contact. This substitution eliminates mechanical wear, particle generation from stirrer contact, and damage to sensitive components while maintaining effective mixing.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

2Object-affected harmful factors

If non-invasive mixing by moving the container is used, then mechanical damage is reduced, but strong vibrations and aerosol formation occur

Engineering Contradiction:
Improvemechanical damageVSAvoidvibrations and aerosol formation
Core Design Contradiction:
Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The patent replaces mechanical container movement with a magnetic field-induced rotation system. Magnets on the vessel wall create localized magnetic forces that directly rotate magnetizable components within the mixture, achieving mixing without moving the entire container. This eliminates the strong vibrations and aerosol formation associated with mechanical shaking while maintaining gentle, effective mixing.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

3Object-affected harmful factors

If gentle mixing by rotating water column is used, then particle generation is minimized, but mixing speed and effectiveness are reduced

Engineering Contradiction:
Improveparticle generationVSAvoidmixing speed
Core Design Contradiction:
Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent applies local quality by positioning multiple magnets at specific locations on the inner surface of the vessel wall, creating localized magnetic field zones that generate rotational motion in different regions of the mixture simultaneously. This localized magnetic actuation achieves gentle mixing without particle generation while significantly improving overall mixing speed compared to a single rotating water column approach.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The patent segments the mixing action by using multiple discrete magnets distributed around the vessel wall rather than a single continuous rotating element. Each magnet or group of magnets creates independent rotational zones, and the combined effect provides comprehensive, fast mixing throughout the entire volume while maintaining gentle, particle-free operation.

Inventive Principle:
Principle #1Segmentation

4Productivity

If traditional central agitator placement is used, then mixing coverage is improved, but particle generation and device complexity increase

Engineering Contradiction:
Improvemixing coverageVSAvoidparticle generation
Core Design Contradiction:
ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the traditional central mechanical agitator with a distributed magnetic field system where magnets are positioned on the inner surface of the vessel wall. This substitution eliminates the need for a central stirring mechanism, preventing particle generation from mechanical contact while achieving comprehensive mixing coverage through the coordinated magnetic fields acting on magnetizable particles throughout the mixture.

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 device enables efficient, gentle, and uniform mixing of diverse fluids, reducing mixing times and preventing particle generation, while being scalable and easy to clean, with minimal product impairment.

Implementation Method 1

at least one magnet is arranged on an inner surface of the mixing container (2)

Methodology Applied
Scientific EffectMagnetic field: Magnetic Field

Implementation Method 2

Due to the friction between the rotating water column and the outer wall of the floating mixing container, the container also begins to rotate

Methodology Applied
Scientific EffectFriction: Friction

Implementation Method 3

The outer container can be designed with a water inlet on its underside, bent in such a way that the incoming water sets the water column in the outer container into rotation

Methodology Applied
Scientific EffectConvection: Convection

Data Source

PatentEP2881383B1Mixing device and its use
Publication Date: 2020.06.24 MERCK PATENT GMBH
  • EP2881383B1 patent drawingFigure 1
  • EP2881383B1 patent drawing
  • EP2881383B1 patent drawing

AI summary

The invention relates to a mixing device (1) with a mixing container (2) comprising a housing with a jacket (4) surrounding an interior space (3), an outwardly convex base (5), and a lid (6), an agitator (7) arranged in the mixing container (2), and a dispensing opening (8) arranged on the mixing container (2). The lid (6), located opposite the base (5), has at least one container opening (9) with a quick-connect fitting. The agitator (7) is inserted laterally or from above into the interior space (3), and the dispensing opening (8) is arranged centrally in the base (5) and includes a bottom drain valve (10). The mixing device (1) has an internal coating to reduce adhesion. The housing has a thermostatic jacket. Handles (12) and wheels (13) for transporting the mixing device are arranged on the sides of the mixing container (2).