Dispensing Face Segmentation for Stable Beverage Extraction Pressure
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Solution Overview
Problem
Existing beverage extraction systems face challenges in achieving consistent flow rates and pressures due to the variability in coffee blends, particularly those with low particle sizes, leading to high backpressure variability.
Innovation Solution
The beverage preparation machine incorporates an extraction unit with a unique dispensing arrangement featuring a flow-through portion and a flow-inhibiting portion, which are designed to adjust the flow path of water through the ingredient capsule, thereby controlling the extraction process and reducing backpressure variability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tearing extraction plate with raised elements is used to tear the outlet membrane, then filtering of coffee particles occurs at the confined interface, but the pressure drop becomes relatively high and backpressure variability increases
Solution Approach 1:
The extraction plate is divided into two distinct functional zones: a tearing zone with raised elements that tears the membrane and provides filtering, and a flow-through zone with larger openings that allows beverage to pass with minimal resistance. This segmentation separates the filtering function from the flow function, reducing the pressure drop while maintaining particle filtration.
Solution Approach 2:
Different regions of the extraction plate are given different properties: the tearing zone has raised elements for membrane deformation and particle filtering, while the flow-through zone has larger openings for low-resistance beverage flow. This local differentiation optimizes each zone for its specific function, reducing overall backpressure while maintaining filtering effectiveness.
2Reliability
If the outlet membrane conforms to the top and upper side of the raised elements, then filtering occurs at the interface, but the flow opening area is reduced and pressure drop increases
Solution Approach 1:
The extraction plate is divided into a tearing zone with raised elements for filtering and a separate flow-through zone with larger openings for beverage passage. This segmentation allows the membrane to conform to raised elements for filtering in one zone while providing adequate flow opening area in the flow-through zone, preventing the reduction of flow area that occurs when filtering and flow are combined in the same region.
3Productivity
If water is introduced under pressure into the capsule, then beverage extraction is achieved, but backpressure variability increases due to variability in coffee blends
Solution Approach 1:
The flow-through portion is designed with larger opening dimensions and greater total open area compared to conventional extraction plates. This parameter change in the geometric characteristics of the extraction plate creates a flow path with lower resistance that can accommodate variations in coffee blend properties, maintaining more consistent backpressure across different coffee types while preserving extraction effectiveness.
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 more consistent beverage extraction by stabilizing the flow rate and pressure, improving the quality of the beverage, and enhancing the efficiency of the extraction process.
Implementation Method 1
a flow-inhibiting portion which is at least substantially flush with the flow-through portion so as to delimit the seat, the flow-inhibiting portion being configured such that beverage flowing out the seat is inhibited, e.g. prevented, from passing through the flow-inhibiting portion
Implementation Method 2
to deform the outlet membrane or cover (e.g. an aluminium membrane) and to tear it under the effect of pressure of the liquid rising in the capsule
Implementation Method 3
to introduce water under pressure via a water injector into the capsule
Implementation Method 4
designed to adjust the flow path of water through the ingredient capsule, thereby controlling the extraction process and reducing backpressure variability
Implementation Method 5
enables more consistent beverage extraction by stabilizing the flow rate and pressure
Data Source
AI summary
A machine (1) for preparing a beverage from an ingredient includes an extraction unit (2) that has: an ingredient extraction seat (20); an inlet arrangement (21) for guiding water into the seat (20); and a dispensing arrangement (22) for guiding beverage out of the seat (20). The dispensing arrangement (22) has a face (220) delimiting a downstream part of the seat (20) and having a flow-through portion (221) configured such that beverage flowing out the seat (20) flows through the flow-through portion (221) towards a beverage dispensing area (1′). The face (220) has a flow-inhibiting portion (222, 222a, 222b, 222c) that is at least substantially flush with the flow-through portion (221) so as to delimit the seat (20). The flow-inhibiting portion (222, 222a, 222b, 222c) is configured such that beverage flowing out the seat (20) is inhibited, e.g. prevented, from passing through the flow-inhibiting portion (222, 222a, 222b, 222c).