Milk Foaming Air Valve Control for Uniform Cold Foam
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Solution Overview
Problem
Existing devices for foaming liquid foodstuffs, such as milk, face challenges in producing consistent cold foam due to varying temperature, fat content, and viscosity, making it difficult to achieve uniform fine porosity and stability, especially for different desired foam types.
Innovation Solution
A device with a pump, air feed line, and control unit featuring an intermittent air valve that can switch between high and low air flow states, allowing precise control of air flow through pulse-duty factor and switching frequency, enabling the production of consistent foam consistencies and volumes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional foaming devices use manual throttle valves for air and milk flow regulation, then the device structure remains simple, but it becomes difficult to produce consistent foam with uniform fine porosity when starting materials vary in temperature, fat content, or viscosity
Solution Approach 1:
The patent applies dynamics by making the air valve intermittent rather than continuously adjustable, allowing it to switch between different flow states dynamically. This dynamic control enables precise regulation of air-to-milk ratio during foaming, achieving consistent foam porosity and uniformity even when starting materials vary in temperature, fat content, or viscosity.
Solution Approach 2:
The patent changes the control parameter from continuous manual throttle adjustment to intermittent air valve switching with controlled duty cycle. By varying the proportion of open/closed states and switching frequency, the system precisely controls average air flow rate, enabling reproducible foam characteristics across different milk conditions without complex continuous adjustment mechanisms.
2Measurement precision
If the air valve switches frequently between high and low air flow states, then the average air flow control precision increases, but the valve wear and potential failure points increase
Solution Approach 1:
The patent implements periodic action through the intermittent air valve that switches between open and closed states at controlled frequencies and duty cycles. This periodic switching enables precise average air flow control while using robust solenoid valve technology designed for repeated cycling, balancing measurement precision with operational reliability.
3Ease of operation
If the device uses a control unit with intermittent air valve switching, then the foaming process becomes easier to operate for achieving desired foam types, but the device complexity increases
Solution Approach 1:
The control unit automatically manages the intermittent air valve switching based on selected foam types, eliminating the need for manual adjustment of multiple parameters. The system self-regulates the air valve duty cycle and frequency to achieve desired foam characteristics, making operation simple while the control logic handles the complexity internally.
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 device achieves high-precision control of air flow, resulting in stable and uniform cold milk foam with adjustable consistency, simplifying the foaming process and accommodating different starting parameters, while being robust and economical.
Implementation Method 1
a pump (2) which, on the suction side, has a feed line (3) which can be connected in a fluid-conducting way to a storage container (1) for the liquid foodstuff
Implementation Method 2
Typically, the air and/or milk is suctioned here by the Venturi effect due to the steam flow
Implementation Method 3
downstream of the throttle, an expansion of the foodstuff-air mixture takes place on the pressure side of the pump, so that cold foam is produced
Data Source
AI summary
A device for foaming a liquid foodstuff, especially milk, is provided including a pump (2) that has, on the suction side, a feed line (3) that can be connected in a fluid-conducting way to a storage container for the liquid foodstuff. An air feed line (3a) by which air can be fed to the foodstuff is arranged in a path of flow of the liquid foodstuff on the suction side of the pump (2) and, a throttle (4a) is arranged in the path of flow of the foodstuff on the downstream side of the pump (2). The air feed line (3a) includes an air valve (3b) that can be controlled by a control unit (9) and the air valve (3b) is an intermittent air valve (3b) having at least one state with high air flow and one state with comparatively lower air flow and/or with no air flow can be specified selectively by the control unit (9), and the control unit (9) and air valve (3b) are constructed to interact such that the average air flow of the air valve can be controlled through repeated switching between the at least two states of the air valve.