Laboratory Mill Rigid Compensating Element for Leak-Proof Oscillation

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Solution Overview

Problem

Existing laboratory mills face challenges in maintaining a leak-proof connection between the grinding bowl and the stationary part due to alternating stress, leading to potential leakage and increased equipment costs, especially when using flexible hoses or rotary unions for compensating relative movements.

Innovation Solution

A rigid compensating element, such as a torsion spring or metallic pipeline, is used to compensate for relative movements between the grinding bowl and the stationary part, allowing for elastic deformation without increasing motor drive power, ensuring a hermetically sealed connection without the need for rotary unions or flexible hoses.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If flexible hoses are used to compensate relative movements between the grinding bowl and stationary part, then the connection can accommodate movement, but the service life is short due to large amplitude alternating stress

Engineering Contradiction:

Improvemovement compensationVSAvoidservice life

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent uses a flexible coupling element (bellows-like structure) that can deform elastically to accommodate relative movements between the grinding bowl and stationary part. This flexible element maintains a hermetically sealed connection while withstanding the alternating stress from oscillatory movement, resolving the contradiction between movement compensation and service life.

Inventive Principle:

Principle #30Flexible shells and thin films

2Reliability

If rotary unions are used to compensate relative movements, then the connection remains hermetically sealed, but the alternating stress causes fatigue of the contacting seal leading to leakage

Engineering Contradiction:

Improvehermetically sealed connectionVSAvoidleakage

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent replaces the rotary union with a flexible coupling element that uses elastic deformation to accommodate movement. This eliminates the contacting seal that causes leakage while maintaining the hermetically sealed connection, resolving the contradiction between sealed connection and leakage prevention.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent substitutes the mechanical rotary union system with a flexible coupling element that uses elastic deformation mechanics. This replacement eliminates the seal fatigue issue inherent in rotary unions while maintaining movement compensation and hermetic sealing.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If rotary unions are used to compensate relative movements, then the connection can accommodate movement, but the equipment costs and installation work increase

Engineering Contradiction:

Improvemovement compensationVSAvoidequipment costs

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent extracts the essential function of movement compensation from the complex rotary union system and implements it through a simpler flexible coupling element. This extraction eliminates unnecessary components while maintaining the ability to accommodate relative movements, reducing equipment costs and installation complexity.

Inventive Principle:

Principle #2Taking out (Extraction)

4Adaptability or versatility

If flexible hoses are used for medium supply, then the connection can accommodate movement, but the leakage risk increases due to short service life

Engineering Contradiction:

Improvemovement accommodationVSAvoidcontamination risk

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent uses a flexible coupling element that maintains hermetic sealing while accommodating movement. This eliminates the leakage and contamination risks associated with flexible hoses, resolving the contradiction between movement accommodation and contamination prevention.

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

This solution provides a cost-effective, low-maintenance, and leak-proof connection during long-term operation, reducing the risk of contamination and medium loss while minimizing equipment costs and installation complexity.

Implementation Method 1

a substantially rigid or rigidly designed compensating element which is elastically deformed at least in some areas during an oscillatory movement of the grinding bowl support to compensate for relative movements

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentUS12259305B2Laboratory mill

Publication Date: 2025.03.25 RETSCH GMBH & CO KG

AI summary

A laboratory mill is shown and described with at least one oscillatably mounted grinding bowl holder for at least one grinding bowl and with at least one line for transporting a liquid or gaseous medium, the line having at least one compensating element for compensating relative movements between the grinding bowl holder and/or the grinding bowl and a stationary part of the laboratory mill. In accordance with the invention, a rigid compensating element is provided for compensating relative movements, wherein the compensating element is elastically deformed at least in regions during an oscillating movement of the grinding bowl holder and wherein the compensation of relative movements is effected free of parts of the compensating element connected to one another so as to be movable, in particular rotatable and/or pivotable, relative to one another and only by elastic deformation of the compensating element.