Milk foaming device and method for producing milk foam
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Solution Overview
Problem
Existing milk-frothing devices in fully automatic coffee machines face challenges in maintaining fine porosity of milk froth at high temperatures and often experience pulsation or break-off of milk flow due to imbalanced air and milk flow ratios, leading to undesirable temperature and quality issues.
Innovation Solution
A milk-frothing device with a variable opening cross section that adjusts both milk and air flow rates simultaneously, ensuring the air flow is throttled as the milk flow decreases, preventing pulsation and allowing for high-temperature froth production up to 75°C with fine porosity, and incorporating a steam nozzle for efficient frothing using the Venturi effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the milk flow is reduced to increase milk froth temperature, then the temperature of the milk froth increases, but the fine porosity of the milk froth decreases
Solution Approach 1:
The invention changes the flow parameters by introducing a variable opening cross-section that simultaneously controls both milk flow and air flow. By reducing the opening cross-section, both flows are reduced proportionally, but the air flow reduction prevents excessive air mixing at low milk flows, thereby maintaining fine porosity even at higher temperatures up to 75°C.
2Temperature
If the milk flow is throttled to control temperature, then the temperature control improves, but the milk flow begins to pulsate or break off
Solution Approach 1:
The invention merges the control of milk flow and air flow through a single variable opening cross-section. This combined control ensures that both flows are reduced proportionally, preventing the air flow from becoming excessive relative to the milk flow, which would cause pulsation or break-off. The synchronized control maintains stable flow conditions while achieving temperature control.
3Manufacturing precision
If the air flow is increased to improve frothing, then the frothing quality improves, but the milk flow decreases due to excessive air admixing ratio
Solution Approach 1:
The invention introduces dynamic control through a variable opening cross-section that can be adjusted to optimize the balance between air flow and milk flow. By dynamically adjusting the opening size, the system can maintain an optimal air admixing ratio that improves froth quality without causing excessive reduction in milk flow rate, unlike fixed configurations.
4Device complexity
If a single variable opening cross section controls both air and milk flow, then the device complexity is reduced, but the control precision may be affected
Solution Approach 1:
The variable opening cross-section serves multiple functions simultaneously: it controls milk flow, controls air flow, and maintains the proper air-to-milk flow ratio. This multi-functional component replaces what would traditionally require separate valves and regulators for each flow, reducing device complexity while maintaining control precision through its dual control capability.
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 ensures uniform and continuous delivery of fine-pored milk froth at high temperatures, preventing milk flow break-off and maintaining quality, even at low delivery rates, by synchronizing air and milk flow adjustments through the variable opening cross section and utilizing the Venturi principle for efficient frothing.
Implementation Method 1
utilizing the Venturi principle for efficient frothing
Data Source
AI summary
A milk foaming device for improving the quality of a milk foam (13) which is produced. The milk foaming device (1) has a mixing chamber (3) in which air (6) and milk (7) can be foamed by a steam flow (9) to provide the milk foam (13). For this purpose the respective flow rates of an air stream (15) and of a milk stream (8), each of which flows into the mixing chamber (3), are set by the air (6) and the milk (7) always flowing together into the mixing chamber (3) through an adjustable, variable opening cross-section (10) which acts as a flow rate reducer for the air stream (15) and the milk stream (8).