Frothing Head Tangential Duct Design for Homogeneous Milk Froth
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Solution Overview
Problem
Existing devices for heating and whipping milk to produce frothed beverages often result in a froth that is not compact and homogeneous, lacking the desired fineness and consistency.
Innovation Solution
A frothing head with a specific geometry, including a mixing chamber, restriction duct, frothing chamber, and distribution duct, which forms a jet pump capable of drawing air and milk into a steam jet, homogenizing the mixture to produce a compact and homogeneous froth. The frothing chamber is disc-shaped with a unique configuration that subjects the mixture to centrifugal forces, breaking bubbles and enhancing froth quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional steam-driven jet pump is used to whip milk, then milk froth is produced, but the froth is not compact and homogeneous
Solution Approach 1:
The frothing head is divided into multiple functional chambers: a mixing chamber for initial steam-milk-air mixing, a frothing chamber for homogenization, and a distribution duct for output. This segmentation allows each chamber to perform a specific function, with the frothing chamber specifically designed to break down large bubbles into finer, more uniform bubbles, thereby resolving the contradiction between producing froth and achieving homogeneous froth quality.
Solution Approach 2:
The frothing chamber is designed with specific local geometric features including a disc-shaped configuration with a bottom surface, top surface, and round side surface. The restriction duct enters tangentially at an intermediate height on the side surface, creating localized turbulent flow patterns that enhance mixing and homogenization in that specific region, thereby improving overall froth uniformity.
2Shape
If air and milk are drawn into the mixing chamber through suction ducts, then the mixture is formed, but the froth lacks compactness and fine texture
Solution Approach 1:
The tangential entry of the restriction duct into the frothing chamber creates turbulent flow and mechanical agitation of the milk-steam-air mixture. This mechanical action breaks down large bubbles into smaller, more uniform bubbles, achieving both compactness and fine texture while maintaining bubble size uniformity.
Solution Approach 2:
The device utilizes pneumatic principles where steam acts as the driving fluid creating a jet pump effect. The steam jet draws air and milk into the mixing chamber, and the resulting three-phase mixture is processed through the frothing chamber where hydraulic turbulence and gas-liquid interaction further homogenize the froth, achieving the desired compact and fine texture.
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 described frothing head effectively produces a compact and homogeneous milk froth, improving the quality and consistency of frothed beverages by ensuring a fine and uniform texture.
Implementation Method 1
a steam jet produced by a nozzle creates, by the Venturi effect, a negative pressure in a suction chamber located downstream of the nozzle, the negative pressure drawing air and milk into the suction chamber through respective inlets connected to said chamber
Implementation Method 2
the frothing chamber is disc-shaped and comprises a bottom surface, a top surface and a round side surface extending between the bottom surface and the top surface, wherein the distal end of the restriction duct leads tangentially into the frothing chamber, at the side surface of the frothing chamber and at an intermediate height between the bottom surface and the top surface
Data Source
AI summary
A frothing head for heating and whipping milk is provided. The frothing head has a mixing chamber, a restriction duct extending from the mixing chamber, a frothing chamber arranged at one end of the restriction duct, a distribution duct, an air suction duct leading into the mixing chamber, and a milk suction duct leading into the mixing chamber. The frothing chamber is disc-shaped, and the restriction duct leads tangentially into the frothing chamber. The distribution duct extends axially from a center of a bottom surface of the frothing chamber and has an upper portion and a lower portion having a greater diameter than the upper portion.