Coffee machine with dispensing pressure regulation
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Solution Overview
Problem
Coffee machines face challenges in maintaining consistent beverage quality due to variations in coffee blends and grind sizes, leading to fluctuations in water pressure and flow rate, which affect the extraction process and taste of the coffee.
Innovation Solution
A coffee machine equipped with a dispensing pressure control system that includes a hydraulic pump, pressure sensor, and variable-flow valve, allowing for real-time adjustment of water pressure and flow rate to maintain optimal brewing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If mechanical compression means are used to increase water pressure for espresso extraction, then beverage extraction quality is improved, but the coffee must be ground very finely which can cause filter obstruction and increase stress on sealing members and ducts
Solution Approach 1:
The patent applies a progressive pressure increase system where water pressure is gradually raised from an initial low pressure (1-1.5 bar) to a final high pressure (9-10 bar) over the course of the extraction cycle. This dynamic pressure adjustment allows the coffee bed to be properly compacted without requiring excessively fine grinding, thereby reducing filter obstruction risks while maintaining extraction quality.
Solution Approach 2:
The system performs a preliminary wetting phase at low pressure before the main high-pressure extraction. This preliminary action allows water to penetrate the coffee bed and establish proper saturation without the mechanical stress of high pressure, preventing premature filter obstruction and enabling subsequent high-pressure extraction with coarser grounds.
2Quantity of substance
If pressure is increased above 10 bar to improve extraction, then beverage concentration is improved, but filter obstruction and stress on sealing members worsen
Solution Approach 1:
The patent optimizes the pressure parameter by capping the maximum extraction pressure at 9-10 bar rather than allowing it to exceed 10 bar. This parameter optimization maintains sufficient beverage concentration while preventing the adverse effects of excessive pressure. The system achieves this through controlled pressure regulation that prevents over-pressurization.
3Productivity
If coffee is ground very finely to counter high water pressure thrust, then extraction efficiency is improved, but filter obstruction and stress on sealing members increases
Solution Approach 1:
By dynamically adjusting pressure throughout the extraction cycle rather than applying high pressure from the start, the system achieves efficient extraction with coarser coffee grounds. The progressive pressure increase allows proper saturation and extraction without requiring the excessively fine grinding that would be necessary with immediate high-pressure 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
Ensures consistent beverage quality by regulating water pressure and flow rate, adapting to variations in coffee blends and grind sizes, thereby maintaining the desired dispensing time and pressure, resulting in a high-quality coffee extraction process.
Implementation Method 1
a pressure sensor disposed along the hydraulic circuit and apt to generate a control signal representative of the pressure detected
Implementation Method 2
a hydraulic pump, at least one dispensing device comprising a filter unit apt to contain coffee powder and a supply unit apt to introduce water into the filter unit
Implementation Method 3
a hydraulic variable-flow valve disposed along the hydraulic circuit and apt to supply variable quantities of water to the at least one dispensing device
Data Source
AI summary
A coffee machine for producing and dispensing coffee-based beverages is disclosed, including a hydraulic pump and at least one dispensing device comprising a filter unit apt to contain ground coffee. A hydraulic circuit brings the hydraulic pump into fluid communication with a supply unit of the dispensing device. The hydraulic circuit includes a supply duct which supplies hot water under pressure to the supply unit. A system for controlling the dispensing pressure includes a control unit, a pressure sensor, and a hydraulic variable-flow valve. The variable-flow valve is actuated by an electronic drive controlled electronically by the control unit in order to regulate the flow rate of water output as a function of a detected dispensing pressure value.