Steam Wand Diffuser With Skewed Holes for Stable Milk Vortex

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Solution Overview

Problem

Conventional steam wand diffusers for frothing milk in espresso machines require precise jug movement and positioning to create a suitable vortex, leading to inconsistent foam texture and temperature control, with misaligned holes reducing optimal vortex generation and increasing the risk of air bubbles and temperature inhomogeneities.

Innovation Solution

A steam wand diffuser with skewed outlet holes, a larger blind longitudinal hole, and a base with steam outlet holes arranged on a single plane, optimizing the angle and spacing of holes to generate a single axial vortex without jug inclination, enhancing heat input and foam consistency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional diffusers with aligned holes are used, then the structure is simple, but the vortex generation is insufficient leading to poor foam consistency

Engineering Contradiction:

Improvefoam consistencyVSAvoiddiffuser structure

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent applies asymmetry by skewing the outlet holes relative to the longitudinal axis of the diffuser. This asymmetric configuration creates a single axial vortex when steam passes through, improving foam consistency and texture without requiring complex additional components. The skewed holes generate rotational flow that symmetric aligned holes cannot produce.

Inventive Principle:

Principle #4Asymmetry

2Manufacturing precision

If the diffuser requires precise jug positioning and movement, then the vortex can be generated, but the ease of operation deteriorates

Engineering Contradiction:

Improvevortex generationVSAvoidjug positioning

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The diffuser design enables self-service by automatically generating the required axial vortex through its skewed hole configuration. The system does not require the operator to manually create vortex conditions through precise jug positioning or movement - the diffuser structure itself generates the necessary flow pattern whenever steam passes through, significantly simplifying operation.

Inventive Principle:

Principle #25Self-service

3Ease of manufacture

If misaligned holes are used in the diffuser, then the manufacturing is easier, but the temperature control worsens due to inhomogeneities

Engineering Contradiction:

Improvediffuser fabricationVSAvoidmilk temperature uniformity

Core Design Contradiction:

Ease of manufactureVSTemperature

Solution Approach 1:

The patent changes the geometric parameters of the outlet holes by skewing them at specific angles relative to the longitudinal axis. This parameter modification optimizes both the vortex generation and temperature distribution. The skewed configuration creates more uniform steam-milk mixing, eliminating temperature inhomogeneities while remaining manufacturable with standard machining processes.

Inventive Principle:

Principle #35Parameter changes

4Manufacturing precision

If conventional diffusers are used, then the device complexity is low, but the foam texture control is reduced

Engineering Contradiction:

Improvefoam textureVSAvoiddiffuser design

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The diffuser is segmented into multiple skewed outlet holes arranged around the longitudinal axis. This segmentation allows each hole to contribute to the overall axial vortex pattern, creating uniform foam texture through distributed steam injection. The segmented approach provides better texture control than a single large opening while maintaining relatively simple construction.

Inventive Principle:

Principle #1Segmentation

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

Simplifies the frothing process, improves temperature control, and results in better foam texture and consistency by leveraging the kinetic energy of steam to create a uniform vortex, reducing unwanted air bubbles and temperature variations.

Implementation Method 1

The operator must in fact be able to trigger a suitable vortex in the milk; to do this it is necessary to move the jug and to move it according to particular angles

Methodology Applied

Scientific EffectVortex: Vortex Ring

Implementation Method 2

results in better foam texture and consistency by leveraging the kinetic energy of steam to create a uniform vortex

Methodology Applied

Scientific EffectKinetic energy:

Implementation Method 3

In other words, to assemble the milk means to provide a dispersion (foam) of steam and air in the milk, and at the same time to increase the temperature of the mixture

Methodology Applied

Scientific EffectHeating: Heating

Implementation Method 4

enhancing heat input and foam consistency

Methodology Applied

Scientific EffectThermal energy:

Data Source

PatentUS20230284819A1Steam wand and method for frothing milk

Publication Date: 2023.09.14 LA MARZOCCO

AI summary

A diffuser (20) for a steam wand (10) for frothing a quantity of milk for the preparation of a beverage, wherein said diffuser (20) is configured to be connected to a steam wand (10) which receives steam from a steam tank and/or from a steam generator, wherein said diffuser (20) comprises a longitudinal axis (22) and a plurality of steam outlet holes (21), each having an outlet hole axis (23), wherein at least one outlet hole (21) has its axis (23) which is skew with respect to said longitudinal axis (22) of the diffuser (20).