Improved apparatus and method for frothing milk
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Solution Overview
Problem
Existing automatic milk froth systems face challenges in achieving high-quality frothed milk consistency and reliability, and the construction of temperature sensors within steam wands is complicated, leading to issues with cleaning and performance.
Innovation Solution
A milk frothing apparatus that combines precisely controlled air flow with steam, using a temperature sensor to adjust the steam and air mixture based on user inputs for different milk types, and includes a controller to monitor pressure and air pump power, detecting potential blockages in the steam wand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a temperature sensor is incorporated into the steam wand for automatic milk frothing, then the automation and consistency of milk frothing is improved, but the device complexity and cleaning difficulty increase
Solution Approach 1:
The patent introduces an intermediary temperature sensor positioned near the steam wand tip but not integrated into it. This sensor measures the temperature of milk or water in the container and communicates this data to a controller, which then regulates steam flow accordingly. This intermediary approach enables automatic temperature control without the complexity of embedding sensors directly in the steam wand, thus maintaining automation while simplifying the wand construction and cleaning process.
2Manufacturing precision
If air is mixed with steam for frothing different milk types, then the froth texture quality is improved, but the control complexity increases
Solution Approach 1:
The patent employs dynamic control of air and steam flow rates based on real-time temperature feedback from the sensor and user-selected milk type parameters. The controller adjusts the proportion of air mixed with steam during the frothing process to achieve optimal texture for different milk types (e.g., whole milk, skim milk, plant-based alternatives). This dynamic adjustment enables precise froth texture control without requiring complex manual intervention, as the system adapts parameters automatically based on sensor data and pre-programmed milk type profiles.
3Reliability
If pressure monitoring is implemented to detect steam wand blockages, then the reliability of milk frothing is improved, but the device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where a pressure sensor monitors the pressure of steam or air in the delivery system. When the sensor detects pressure exceeding a predetermined threshold, it signals the controller that a blockage may be present in the steam wand or delivery path. The controller then responds by adjusting or shutting off steam flow to prevent damage and alerts the user to clean the wand. This feedback-based monitoring system enhances reliability by enabling automatic detection and response to blockages without requiring complex additional hardware, as it utilizes the existing pressure sensing capability already present in the steam generation system.
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 improved milk froth quality, automatic adjustment of air and steam parameters, and enhanced reliability by ensuring consistent froth texture and temperature, while simplifying the construction and maintenance of the steam wand.
Implementation Method 1
the construction of a wand incorporating a temperature sensor such as a thermistor
Implementation Method 2
steam or a mixture of steam and air is generally introduced into the milk through a wand
Implementation Method 3
an air injector module for mixing the air and steam
Implementation Method 4
The means for delivering steam is movable between an operating position for delivering steam to the container
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A temperature sensing assembly for a milk frothing apparatus. The assembly including: a temperature sensor element and a resilient support element that receives and biases the temperature sensor element towards thermal communication with the underside of a vessel; wherein the assembly is located towards the end of a protruding portion that extends from the body of the a milk frothing apparatus; and wherein an upper surface of the temperature sensor assembly is adapted to promote liquid movement into a drip tray reservoir. The apparatus may include: a steam source; an air source coupled to an air injector module for mixing the air and steam; a user interface for receiving input from a user; and wherein the apparatus is configurable by receiving input parameters through the user interface, whereby the parameters includes final milk temperature, and an indication of froth amount.