Coffee Machine Pressure Profiling for Multi-Unit Extraction
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Solution Overview
Problem
Existing espresso coffee machines lack flexible pressure regulation, requiring manual adjustment by a technician and maintaining constant pressure across multiple 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 parallel ducts with electronically controlled valves, allowing variable pressures for each dispensing unit to optimize coffee extraction phases, enabling independent pressure profiling for each unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single pump assembly supplies constant pressure to multiple dispensing units, then device complexity is reduced, but coffee cooking uniformity deteriorates
Solution Approach 1:
The water supply system is segmented into multiple parallel ducts (first duct, second duct, third duct) that can operate independently. Each duct can be selectively activated to supply different pressure levels to different dispensing units, allowing uniform coffee cooking across multiple units while maintaining relatively simple device architecture through shared pump assembly.
Solution Approach 2:
The system dynamically adjusts pressure supply by selectively opening and closing valves in different ducts based on the specific dispensing unit being used and the required coffee preparation parameters. This dynamic pressure management enables consistent coffee cooking performance across varying conditions while using a single pump assembly.
2Manufacturing precision
If pressure is manually adjusted by technician, then manufacturing precision is improved, but ease of operation deteriorates
Solution Approach 1:
The system performs self-service pressure regulation through electronically controlled valves in each duct that automatically adjust water pressure based on pre-programmed parameters or user selections. The control unit manages pressure distribution without requiring manual intervention by technicians, combining precise pressure control with ease of operation.
Solution Approach 2:
Manual mechanical pressure adjustment by technicians is replaced with an electronic control system that uses electronically controlled valves and a control unit to automatically regulate pressure. This substitution maintains manufacturing precision while dramatically improving ease of operation for end users.
3Device complexity
If constant pressure is maintained during extraction, then device complexity is reduced, but manufacturing precision deteriorates
Solution Approach 1:
The pressure control system dynamically adjusts pressure during the coffee extraction process by selectively activating different ducts at different stages. The system can apply higher pressure during initial extraction and reduce pressure during later stages, or vice versa, depending on the coffee preparation requirements. This dynamic approach improves extraction precision without requiring overly complex pressure control mechanisms.
Solution Approach 2:
The system employs periodic action by sequentially activating different ducts during the extraction process. Different ducts with different pressure characteristics are activated in sequence or combination to create optimal pressure profiles for different phases of coffee extraction, improving manufacturing precision while maintaining manageable device complexity.
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 uniform coffee 'cooking' and optimal extraction by dynamically adjusting pressure during brewing, using a single pump source to supply multiple units, enhancing the organoleptic properties of coffee.
Implementation Method 1
a pump assembly (11) arranged to increase the water pressure up to a given first pressure value P1
Implementation Method 2
a pressure managing device (20) downstream the pump assembly (11) arranged to reduce the water pressure from the first pressure value P1 to a second pressure value P2
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 (PI); 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) and a method of preparing the coffee infusion, comprising dynamically modifying the pressure during the infusion preparation.