Foam Outlet Flow Resistor With Elastic Passages for Stable Bubbles
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Solution Overview
Problem
Existing foam production apparatuses, such as those described in DE 10 2008 058 934 A1, are limited in their ability to consistently produce high-quality, stable foams due to the destruction of large air bubbles and the formation of small air bubbles that do not result in a stable foam structure.
Innovation Solution
The apparatus incorporates a flow resistor with movable, elastic resistor elements that adjust passage cross-sections in response to pressure changes, allowing for the generation of a fine-pore, stable foam by densifying and loosening the resistor elements as the aerated liquid passes through, ensuring a high-quality foam production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a sieve is disposed in the outlet nozzle to destroy large air bubbles, then large air bubbles are destroyed and small air bubbles are formed, but the foam stability is not improved
Solution Approach 1:
The flow resistor elements are made of elastic material that can dynamically adjust the passage cross-section in response to pressure changes. During pumping, the elements are compressed to reduce passage area, creating fine-pore foam. During intervals, they expand to restore the original passage area, enabling the foam to maintain stability without being destroyed by a static sieve structure.
Solution Approach 2:
The passage cross-section of the flow resistor is dynamically changed based on pressure conditions. Under high pumping pressure, the elastic resistor elements are densified to create smaller passages for fine foam generation. When pressure decreases, the elements loosen to increase passage area, allowing foam to escape without destruction, thus maintaining foam stability.
2Manufacturing precision
If the resistor elements are densified under increasing pressure, then the passage cross-section decreases and fine-pore foam is generated, but the device complexity increases
Solution Approach 1:
The elastic resistor elements automatically adjust their own configuration in response to pressure changes without external control. The material's inherent elasticity causes the elements to compress under pressure and expand when pressure is released, creating a self-regulating system that simplifies the overall device structure while achieving fine-pore foam generation.
Solution Approach 2:
The flow resistor elements are constructed from flexible elastic material that can deform under pressure. This flexibility allows the elements to dynamically change passage cross-sections without requiring complex mechanical actuation systems, reducing device complexity while maintaining manufacturing precision for homogeneous foam production.
3Stability of the object's composition
If the resistor elements loosen upon pressure decrease, then the passage cross-section increases and foam stability is improved, but the force control precision decreases
Solution Approach 1:
The elastic resistor elements provide automatic feedback control based on pressure conditions. When pressure increases during pumping, the elements compress to reduce passage area. When pressure decreases during intervals, the elements expand to increase passage area. This pressure-responsive feedback mechanism maintains foam stability while the force range (1-400 Newtons) provides sufficient control precision for the application.
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 enables the production of a high-quality, stable foam by adjusting the passage cross-sections in the flow resistor in response to pressure changes, resulting in a fine-pore foam that is homogeneous and of consistent quality, with the elasticity of the resistor elements adapted to the pumping pressure to exert a force of 1 to 400 Newtons.
Implementation Method 1
at least one flow resistor is provided which comprises a plurality of adjacent resistor elements of an elastic material which are movable relative to one another
Implementation Method 2
with increasing pressure of the aerated liquid conducted to the flow resistor, the resistor elements present in the flow resistor are densified and, as a result, the cross-section of the passages between the resistor elements decreases
Implementation Method 3
an aerating device by which the liquid can be aerated
Implementation Method 4
a pump for transporting the aerated liquid from the aerating device to the outlet arrangement
Implementation Method 5
between which there are passages through which the aerated liquid is forced whereby a high quality stable foam is generated
Data Source
AI summary
In an apparatus for foaming a liquid with an aerating device by which the liquid can be aerated, an outlet arrangement which is in communication with the aerating device via a conduit and a pump arranged in the conduit for transporting the aerated liquid from the aerating device to the outlet arrangement, at least one flow resistor is provided in the conduit or the outlet arrangement which includes a plurality of adjacent resistor elements of an elastic material which are movable relative to one another and between which there are passages through which the aerated liquid is forced whereby a high quality stable foam is generated and a pump control arrangement is provided for maintaining the aerated liquid under pressure.