Coffee Pressure Management for Multi-Unit Espresso Extraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing espresso coffee machines lack flexible pressure regulation, requiring manual adjustment by a technician and offering constant pressure across all dispensing units, leading to non-uniform coffee 'cooking' during extraction phases.
Innovation Solution
A coffee machine with a single pump assembly and pressure managing device, featuring multiple ducts with adjustable valves to provide distinct pressures for each dispensing unit, allowing independent pressure profiling for optimal coffee extraction and uniform 'cooking'.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single pressure source is used for all dispensing units, then device complexity is reduced, but pressure regulation flexibility is lost
Solution Approach 1:
The system segments the pressure delivery path by providing separate pressure control mechanisms for each dispensing unit through dual ducts (first duct for pre-brewing, second duct for brewing), while keeping a single pump assembly. This allows independent pressure regulation at each dispensing unit without requiring multiple pump assemblies.
Solution Approach 2:
The patent introduces intermediary pressure control devices (such as pressure reducing valves or accumulators) between the single pump assembly and each dispensing unit. These intermediaries enable flexible pressure regulation for each unit while the single pump provides the primary pressure source.
2Device complexity
If constant pressure is maintained during dispensing, then system simplicity is preserved, but coffee cooking uniformity deteriorates
Solution Approach 1:
The system transitions from constant pressure to dynamic pressure control by switching between different ducts (first duct for pre-brewing, second duct for brewing) based on the dispensing phase. This enables pressure to be adjusted according to the specific requirements of each brewing phase, ensuring uniform coffee cooking.
Solution Approach 2:
The patent implements periodic pressure variation during the brewing process by alternating between pre-brewing phase (using first duct with lower pressure) and brewing phase (using second duct with higher pressure). This periodic pressure adjustment ensures uniform extraction and cooking of coffee.
3Device complexity
If manual pressure adjustment by technician is used, then device complexity is reduced, but operation flexibility is limited
Solution Approach 1:
The system enables self-service pressure adjustment by providing user-accessible controls (such as buttons or switches) that allow operators to select different pressure profiles for each dispensing unit without requiring technical intervention. The microprocessor-controlled system automatically adjusts pressure based on user selections.
Solution Approach 2:
The patent incorporates feedback mechanisms where the microprocessor monitors and adjusts pressure based on selected brewing parameters. This automated feedback loop eliminates the need for manual technician adjustment while maintaining optimal pressure settings for different coffee preparations.
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
Enables flexible and uniform coffee 'cooking' by adjusting pressure dynamically across dispensing phases, utilizing a single pump source to supply multiple units with varying pressures, enhancing the extraction of coffee's organoleptic characteristics.
Implementation Method 1
a pump assembly (11) arranged to increase a water pressure supplied by water mains
Implementation Method 2
heating the water under pressure by means of a boiler
Data Source
Figure 1
Figure 2
AI summary
The present invention relates to a machine for preparing coffee infusions by means of a liquid under pressure, in particular water under pressure, the machine comprising: a pump assembly (11) arranged to raise the pressure of the liquid outgoing from the pump assembly up to a preset pressure value (P1); one or more dispensing units (14) connected to the pump assembly, each dispensing unit (14) being arranged to dispense the coffee infusion; one or more pressure managing devices (20), each managing device (20) being connected to a certain dispensing unit (14). In the machine (10), the pressure managing device (20) includes a first duct (15) and at least one second duct (16) that are connected in parallel, have a common outlet and are arranged to supply the dispensing unit (14), during the coffee infusion preparation, with liquid at different pressures. The invention further concerns the pressure managing device (20).