Steam Mixer Layout for Even Milk Froth Heating
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Solution Overview
Problem
Existing steam/liquid mixers in coffee machines heat milk or milk froth unevenly due to transverse steam supply, leading to inadequate mixing and fluidic inefficiencies.
Innovation Solution
The steam supply pipe discharges into a steam supply chamber upstream of the mixing chamber, with steam inlet holes around the milk supply nozzle aligned in the longitudinal direction, ensuring even steam distribution and thorough mixing without turbulence, and optionally featuring a two-part design for easier cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If steam is supplied transversely into the mixing chamber in bundled directions, then the device structure remains simple, but the mixing of steam with milk becomes spatially uneven and fluidically inadequate
Solution Approach 1:
The steam supply is segmented into multiple steam inlet holes distributed around the milk supply nozzle in the longitudinal direction, replacing the single bundled steam supply. This segmentation enables steam to be introduced at multiple locations simultaneously, achieving spatially uniform mixing while maintaining structural simplicity.
Solution Approach 2:
The steam supply direction is changed from transverse (perpendicular to longitudinal axis) to longitudinal (parallel to the axis), representing a dimensional reorientation. This allows steam to enter along the flow direction of milk, creating more uniform distribution throughout the mixing chamber volume.
2Manufacturing precision
If steam inlet holes are added around the milk supply nozzle, then mixing uniformity improves, but the device structure becomes more complex
Solution Approach 1:
The steam inlet holes are integrated directly into the mixing chamber wall structure, merging the steam supply function with the mixing chamber structure. This eliminates the need for separate steam distribution components, achieving improved mixing uniformity without proportionally increasing device complexity.
Solution Approach 2:
The mixing chamber structure serves multiple functions: it contains the milk flow, provides structural support, and incorporates steam inlet holes for steam distribution. This multi-functionality reduces the need for additional dedicated components, balancing mixing uniformity with structural simplicity.
3Ease of manufacture
If the mixer is made as a single integrated component, then production and assembly are simplified, but cleaning accessibility is reduced
Solution Approach 1:
The mixer is segmented into separable components (such as the mixing chamber being detachable from the steam supply assembly), allowing the internal surfaces and steam inlet holes to be accessed for cleaning while maintaining relatively simple production and assembly processes for each component.
4Manufacturing precision
If throttles with different degrees of throttling are added before and after the mixer, then mixing effect is optimized, but device complexity increases
Solution Approach 1:
The throttling parameters (degree of restriction) are optimized differently for the inlet and outlet sides of the mixer. The throttle before the mixer has a smaller degree of throttling to maintain adequate flow, while the throttle after has a larger degree to enhance mixing effect. This parameter optimization improves mixing without requiring complex additional mechanisms.
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 configuration ensures even and optimal heating of milk or milk froth, improving the quality of the final drink by achieving fluidically optimal mixing and enhancing the mixer's accessibility for cleaning.
Implementation Method 1
the steam is introduced evenly into the milk or the milk froth in the direction of the jet of milk flowing through the mixing chamber so that both media can also mix evenly and thoroughly with one another along the entire mixing chamber
Implementation Method 2
Devices of this type are used in particular in automatically working coffee machines for the preparation of drinks containing milk or milk froth. It is well known that the milk or the milk froth is heated here by mixing it with the steam that is supplied to it.
Data Source
AI summary
Device for heating milk or milk froth with steam in a steam/liquid mixer which is equipped with a tubular mixing chamber, at least one steam supply pipe and a milk/milk froth supply nozzle aligned in the longitudinal direction of the mixing chamber. The steam supply pipe operatively discharges steam into a steam supply chamber upstream of the mixing chamber and which is connected to the mixing chamber by steam inlet holes running around the milk/milk froth supply nozzle in the longitudinal direction of the mixing chamber. The steam supply holes are preferably aligned axially parallel to the center axis of the mixing chamber. This arrangement of the steam inlet holes brings about even and thorough mixing of the steam with the cold milk or the milk froth in the mixing chamber, and so optimal heating of the milk or the milk froth.