Portable Temperature Probe for Milk Frothing Steam Wand Control
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Solution Overview
Problem
Existing milk frothing systems in beverage production machines, such as coffee machines, face challenges in accurately controlling milk temperature and froth quality due to unreliable temperature sensors, which often detect the metal container temperature instead of the milk temperature, leading to inefficiencies and waste.
Innovation Solution
A portable, detachable temperature probe is used to directly measure the milk temperature inside a container, allowing for precise control of steam and air flow from a steam wand, with options for wireless data transmission and multiple sensor integration to improve accuracy and hygiene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is mounted on the wand or in the container, then the temperature can be detected, but the sensor detects the metal container temperature instead of the milk temperature, leading to measurement errors
Solution Approach 1:
The patent introduces an intermediary substance (dielectric liquid or gas) between the temperature sensor and the milk to prevent direct contact. The sensor measures the temperature of the intermediary medium, which is in thermal equilibrium with the milk, thereby indirectly measuring the milk temperature without the sensor being in direct contact with the conductive liquid that causes measurement errors
Solution Approach 2:
The patent replaces the direct mechanical contact measurement system with an electromagnetic field-based measurement system. The temperature sensor measures temperature through the dielectric medium via electromagnetic fields rather than direct thermal conduction, eliminating the problem of metal container interference
2Ease of operation
If the temperature sensor is placed under the bottom of the container, then it can detect temperature, but it incorrectly detects the metal container temperature instead of the milk temperature
Solution Approach 1:
The patent places the temperature sensor in contact with a dielectric liquid or gas intermediary that is in thermal equilibrium with the milk. This intermediary acts as a mediator that allows the sensor to indirectly measure milk temperature without direct contact, solving both the ease of installation and measurement accuracy problems
3Reliability
If the steam wand is separated from the coffee machine, then hygiene is improved, but the system complexity increases
Solution Approach 1:
The patent divides the beverage preparation system into separate functional modules: a steam generation unit, a separate wand for steam delivery, and an external container for milk. This segmentation allows the wand to be easily detached for cleaning while maintaining functional integration through standardized connection interfaces
Solution Approach 2:
The patent designs the steam wand with universal connection interfaces that can be attached to different coffee machine models and configurations. The wand serves multiple functions including steam delivery, temperature sensing, and easy detachment for cleaning, reducing overall system complexity despite the separated design
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 precise temperature control and improved froth quality by accurately measuring milk temperature, reducing waste and ensuring consistent beverage preparation.
Implementation Method 1
The steam wand (20) supplies heated steam in order to heat the liquid (L)
Implementation Method 2
hot-steam wands are used. The milk is heated with steam
Implementation Method 3
a flow of forced air coming from a compressor
Implementation Method 4
added with forced air - by means of a compressor - to make it take in air
Implementation Method 5
the probe is inserted or configured to be insertable into the container at a distance from the bottom of the same container where in use there is the liquid, so as to be in direct contact with the - and/or immersed in - the liquid to be probed
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
To better heat and/or froth milk (L) or a liquid with a wand (20), supplying heated steam, belonging to an electric beverage production apparatus, in particular an espresso coffee machine, the milk (L) or liquid being contained in a container (T) external to the machine, the temperature of the milk (L) or liquid is detected by a portable temperature probe (50), separated and/or detachable from the wand (20) and from the container (T) and from any component of the apparatus, and the steam supply from the wand (20) is electronically controlled as a function of the detected temperature.