Coffee Machine Air Heating for Adjustable Milk Froth Control
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Solution Overview
Problem
Consumer-grade coffee machines lack the ability to adjust milk froth consistency and quality, as they rely on predetermined geometric parameters, preventing users from customizing their milk froth like professional baristas without expensive additional components.
Innovation Solution
Incorporating a second heating device for the air intake line, controlled by a control device, to adjust the temperature and mass flow of air, influencing the milk froth production by varying the steam-air-milk ratio, allowing users to adjust milk froth parameters like volume and temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a second heating device for the air intake line is added, then the ability to adjust milk froth parameters is improved, but the device complexity and cost increase
Solution Approach 1:
The second heating device is integrated into the existing heating system architecture, allowing the same heating mechanism to serve dual purposes: heating the air intake line and potentially working in conjunction with the first heating device for steam generation. This multi-functionality approach adds the desired air heating capability while minimizing additional complexity by reusing proven heating technology rather than introducing entirely new components.
2Adaptability or versatility
If a second heating device for the air intake line is added, then the ability to adjust milk froth parameters is improved, but the cost of the coffee machine increases
Solution Approach 1:
The second heating device leverages the existing control device infrastructure already present in the coffee machine. The control device automatically manages the heating power of the second heating device based on selected milk froth parameters, eliminating the need for separate control mechanisms. This self-service approach allows the system to handle the additional heating function using existing control capabilities, thereby avoiding the need for expensive additional switching and measuring components that would otherwise be required.
3Adaptability or versatility
If the temperature of air flow is increased, then the mass flow of air decreases due to density changes, but the ability to influence milk froth volume is improved
Solution Approach 1:
The system deliberately changes the temperature parameter of the air flow to control the milk froth volume. By heating the air to different temperature levels, the density of the air changes, which in turn affects the mass flow rate. The control device compensates for this by adjusting the heating power to achieve the desired milk froth characteristics, transforming a potential disadvantage (reduced mass flow) into a useful control mechanism for adjusting milk froth volume.
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
Enables consumers to customize milk froth production, mimicking professional barista capabilities without additional expensive components, enhancing user control over milk froth consistency and quality.
Implementation Method 1
a second heating device (11) for heating the air (9) flowing in the air intake line (2)
Implementation Method 2
The air is sucked in to produce milk froth via a negative pressure, which is set in the milk frother by the steam flowing through the steam line into the milk frother
Data Source
Figure 1
AI summary
The present invention relates to a coffee machine (1) with an air intake line (2), a steam line (3), and a milk line (5) connectable to a milk reservoir (4), wherein the steam line (3) leads into a milk frother (6), wherein a first heating device (7) is provided for generating steam, wherein a second heating device (11) is provided for heating the air (9) flowing in the air intake line (2), and wherein a control device (12) is provided for controlling the heating power of at least the second heating device (11). This allows a barista function to be implemented even in consumer-grade machines.