Foam Forming Unit Cavity Design for Bubble Refinement
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Solution Overview
Problem
Existing foam-forming units struggle to produce foams with fine and uniform air bubbles, as they are limited by the internal dimensions of the spout element and lack adjustable counter-pressure, which affects the quality of the foam produced.
Innovation Solution
The foam-forming unit includes an outflow channel with a cavity after the first passage through the foam-forming element, allowing adjustable counter-pressure and enabling the foam to pass through the foam-forming element twice, with optional screens and mixing elements to refine the foam quality, and integral valves to reduce components and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the foam-forming element is arranged to pass through twice in the spout element, then finer and more uniform foam is produced, but the internal dimensions of the spout element limit the size and effectiveness of the foam-forming element
Solution Approach 1:
The foam-forming element is divided into two separate screens with different mesh sizes (first screen: 10-150 μm, second screen: 0.1-0.4 mm). This segmentation allows each screen to perform a specific function in the foam refinement process, overcoming the space limitation by distributing the foam-forming function across multiple smaller components rather than requiring a single large element.
Solution Approach 2:
The patent introduces a new spatial dimension by adding a cavity between the two screens, allowing the foam to pass through the first screen, enter the cavity, and then pass through the second screen. This dimensional arrangement enables the foam to be processed twice through different screen meshes without requiring the spout element to be excessively large, thus resolving the contradiction between foam quality and space constraints.
2Manufacturing precision
If a cavity is added after the first passage through the foam-forming element, then adjustable counter-pressure is achieved to improve foam quality, but the device complexity increases
Solution Approach 1:
The cavity serves multiple functions simultaneously: it provides adjustable counter-pressure to improve foam uniformity, acts as a flow regulation chamber, and enables the foam to contact the second screen for further refinement. By making the cavity multi-functional, the patent reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving the desired foam quality improvement.
Solution Approach 2:
The cavity dimensions (height, width, length) are designed as adjustable parameters that can be modified to change the counter-pressure applied to the foam. This allows the same basic cavity structure to adapt to different foam quality requirements without requiring fundamental redesigns, thus improving foam uniformity while controlling device complexity through parameter optimization rather than structural multiplication.
3Manufacturing precision
If screens with small opening dimensions are used (0.1-0.4 mm), then finer foam is produced, but the resistance to foam flow increases
Solution Approach 1:
The foam refinement process is segmented into two stages with different screen mesh sizes. The first screen (10-150 μm) handles the initial fine filtering, while the second screen (0.1-0.4 mm) with larger openings handles the final refinement. This segmentation distributes the flow resistance across two screens rather than concentrating it in a single fine mesh, making the overall system more manageable while still achieving fine foam production.
Solution Approach 2:
The cavity introduced between the two screens adds a volumetric dimension to the flow path. This allows the foam to expand and redistribute between the screens, reducing the velocity and pressure buildup that would occur if the foam were forced through both fine screens in immediate succession. The cavity acts as a buffer zone that mitigates the cumulative flow resistance of the two screens.
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 design results in a finer and more uniform foam, with adjustable dimensions and components that simplify production and adaptability to various liquids, while maintaining cost-effectiveness and functionality in wet environments.
Implementation Method 1
The cavity, and thereby the counter-pressure, is important in creating a resistance whereby the foam is as it were forced to pass through the foam-forming element at a determined speed
Implementation Method 2
a screen foam-forming element is arranged in the outflow channel before the first foam-forming element. This is found to further improve the quality of the dispensed foam
Data Source
AI summary
A foam-forming unit is disclosed. The foam-forming unit includes a mixing chamber communicating with the outlet of a pump for the purpose of mixing liquid and air, and includes a dispensing part provided with an outflow channel with a foam opening for dispensing foam, wherein the outflow channel is in communication with the mixing chamber. Further, a first foam-forming element is included, arranged in the outflow channel such that the foam flowing through the outflow channel passes through the foam-forming element at least twice. The dispensing part is further provided with a spout element in which is located the final part of the outflow channel and the foam opening. Finally, the outflow channel includes a cavity after the first passage through the first foam-forming element, which cavity lies before the spout element as seen in flow direction.