Milk Frothing Valve Control With Steam Injection and Cooling Separation
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Solution Overview
Problem
Existing milk frothing and heating technologies face challenges such as overheating, protein deterioration, and inefficient energy use, particularly in automated systems, which affect frothing quality and hygiene standards, especially in self-service settings and when transitioning between hot and cold beverage preparation.
Innovation Solution
An automatic apparatus using saturated steam for heating and frothing milk, featuring a proportional valve actuated by shape memory alloys to control air and steam flow, minimizing component complexity and energy consumption, and incorporating a steam injection device to efficiently mix steam and milk, while maintaining hygiene and simplifying washing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If manual frothing with steam nozzle is used, then frothing operation can be performed, but the milk temperature cannot be precisely controlled causing overheating and protein deterioration
Solution Approach 1:
The system incorporates temperature sensors that continuously monitor milk temperature and provide feedback to the control unit, which automatically adjusts the steam flow rate to maintain the milk temperature within the optimal range (60-70°C), preventing overheating and protein deterioration
Solution Approach 2:
The patent replaces manual mechanical operation with an automated control system that uses electronic sensors, microprocessors, and automated valve control to manage the frothing process, eliminating the need for manual temperature monitoring and adjustment
2Ease of operation
If steam nozzle is insisted on for frothing, then frothing operation continues, but milk temperature exceeds limit causing protein breakdown and poor froth quality
Solution Approach 1:
The system performs self-monitoring and self-adjustment through automated temperature sensing and control, where the apparatus automatically regulates steam injection to maintain optimal frothing conditions without requiring operator intervention or expertise
Solution Approach 2:
The control system dynamically adjusts the steam flow rate parameter based on real-time temperature measurements, modifying the intensity of steam injection to maintain milk temperature within the optimal range for protein stability and froth quality
3Productivity
If heat exchanger is used for heating foamed milk, then heating function is provided, but milkstone deposits form on walls requiring frequent energetic washing
Solution Approach 1:
The patent extracts the heating function from a separate heat exchanger component and integrates it directly into the steam injection system, where steam heats the milk in-place during the frothing process itself, eliminating the dedicated heat exchanger that would require cleaning
Solution Approach 2:
The heating and frothing functions are merged into a single integrated process where steam serves dual purposes: providing the mechanical action for frothing and simultaneously heating the milk to optimal temperature, eliminating the need for separate heating equipment
4Manufacturing precision
If pump is used to force milk flow for dosing, then consistent dose is achieved, but system complexity increases
Solution Approach 1:
The system uses pneumatic pressure from the steam generation system itself to drive milk flow through the frothing chamber, utilizing the existing hydraulic/pneumatic infrastructure rather than adding separate mechanical pumping components
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 apparatus efficiently produces high-quality foamed milk at desired temperatures, reduces water usage, and automates washing and sanitizing, ensuring consistent frothing and flavor preservation with enhanced energy efficiency and reduced bacterial risk.
Implementation Method 1
a proportional valve actuated with shape memory alloys which calibrates the quantity of air and steam
Implementation Method 2
by means of saturated steam
Implementation Method 3
the increased latent heat of condensation
Implementation Method 4
a steam injection device to efficiently mix steam and milk
Data Source
Figure 1
Figure 2
AI summary
An automatic apparatus (10) for heating and frothing milk is described, comprising a steam generating device (12) configured to generate steam for the heating of the milk, a first hydraulic circuit (14) at a high temperature, a refrigerating group (16) configured to maintain the conservation temperature of the milk, and a second hydraulic circuit (18) at a low temperature. The refrigerating group (16) comprises at least one milk container (20) and at least one pump (22), configured to draw the milk from the container. The apparatus (10) comprises a first total separation valve (24), which separates the second hydraulic circuit (18) at a low temperature from the first hydraulic circuit (14) at a high temperature, a second total separation valve (26) which modulates the quantity of air drawn by the pump (22), a third total separation valve (28) which separates both the first hydraulic circuit (14) at a high temperature and the second hydraulic circuit (18) at a low temperature from a milk dispensing circuit, a steam injection device (32) which mixes the steam with the flow of frothed milk, and a fourth total separation valve (34) which modulates the quantity of steam outlet from the steam generating device. Each total separation valve is provided with an actuator element manufactured with a shape memory alloy.