Steam Ejector Milk Frother for Stable Foam and Simpler Circuits
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Solution Overview
Problem
Existing milk frothing solutions for professional coffee machines face challenges in maintaining quality and stability of froth over time due to factors like different milk types, operation conditions, and incorrect staff training, leading to frequent maintenance needs and complex systems that are difficult to operate and maintain.
Innovation Solution
An apparatus with a steam ejector device installed upstream of the pump, which injects steam into the milk before frothing, creating a depression to ensure milk suction and a positive pressure downstream for ideal frothing conditions, eliminating air expansion issues and simplifying the circuit, while a control unit manages steam and air input based on recipes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If steam is inserted downstream of the gear pump to heat the whipped milk, then the milk is heated, but the quality of the froth deteriorates due to quick expansion of air creating undesired bubbles
Solution Approach 1:
The steam ejector device is positioned upstream of the gear pump to inject steam into the milk before the whipping process. This preliminary heating action prevents the quick expansion of air that occurs when steam contacts already-whipped cold milk downstream, thereby avoiding undesired bubbles and maintaining froth quality while still achieving the desired temperature increase.
2Manufacturing precision
If additional mechanical elements are added downstream of the pump to break air bubbles and re-homogenize the froth, then the froth quality improves, but the apparatus complexity increases and maintenance becomes more difficult
Solution Approach 1:
By positioning the steam ejector device upstream of the gear pump, the steam is injected into the milk before whipping occurs. This preliminary action heats the milk in advance, preventing the formation of large air bubbles during the whipping process itself, thereby eliminating the need for additional downstream mechanical elements to break bubbles and re-homogenize the froth.
3Device complexity
If the steam ejector device is positioned upstream of the pump, then the circuit is simplified and maintenance is reduced, but the steam must effectively create depression for milk suction and positive pressure downstream
Solution Approach 1:
The steam ejector device utilizes pneumatic principles where injected steam creates a depression (negative pressure) that draws milk into the mixing chamber, and simultaneously generates positive pressure downstream to propel the heated milk toward the gear pump. This pneumatic action simplifies the circuit by eliminating the need for additional pumping mechanisms while effectively managing the pressure requirements for milk flow.
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 ensures high-quality, stable froth production with reduced complexity and maintenance requirements, allowing for efficient processing of both cold and heated milk, and easy operation by non-specialized staff, while maintaining reliability and safety.
Implementation Method 1
a steam ejector device (9) configured to inject steam into the milk to be frothed to obtain a milk and steam mixture
Implementation Method 2
supplying the steam ejector device (9) with the correct quantity of steam allows to obtain a depression upstream of the device (9) and a positive pressure downstream
Implementation Method 3
a pump (11), preferably a gear pump, placed downstream of the steam ejector device (9), configured to suck the mixture of milk and steam and air coming from the outlet line (97) of the steam ejector device (9) and form a froth
Data Source
AI summary
An apparatus for frothing milk includes: a container for milk to be frothed; a steam source; a steam ejector device including a first inlet line in fluid communication with the container and a second inlet line in fluid communication with the steam source, the steam ejector device injecting steam into the milk to obtain a milk and steam mixture, the steam ejector device including an outlet line for the milk and steam mixture; an air intake in fluid communication with the outlet line of the steam ejector device; and a pump located downstream of the steam ejector device for drawing the mixture of milk and steam and air coming from the outlet line of the steam ejector device, the pump forming a froth of the mixture of milk and steam delivering the froth along a delivery line.