Coffee Machine Pressure Regulation for Consistent Extraction
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Solution Overview
Problem
Current coffee machines face challenges in maintaining high-quality beverage extraction due to variations in coffee grind size and pressure, leading to inconsistent dispensing times and potential filter obstruction, which affects the taste and quality of espresso and filter coffee.
Innovation Solution
A coffee machine equipped with a dispensing pressure control system that includes a hydraulic pump, pressure sensor, and electronic drive, allowing for real-time adjustment of water flow to maintain optimal dispensing pressure and prevent filter obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pressure is increased to improve water flow through coffee powder, then extraction efficiency is improved, but filter obstruction and sealing member stress increase
Solution Approach 1:
The patent applies dynamics by transitioning from static mechanical compression to dynamic hydraulic pressure control. The system uses a hydraulic pump to generate variable pressure that can be adjusted in real-time based on flow conditions, allowing optimal pressure application without excessive force that would cause filter obstruction or sealing member damage.
Solution Approach 2:
The patent implements parameter changes by controlling pressure as a variable parameter rather than a fixed value. The hydraulic system allows pressure to be modulated based on actual flow conditions, coffee powder characteristics, and extraction stage, enabling efficient extraction while preventing harmful effects of excessive pressure.
2Productivity
If coffee is ground finer to increase contact surface with water, then extraction is improved, but filter obstruction risk increases
Solution Approach 1:
The patent applies feedback by using flow sensors to monitor water passage through the coffee powder and adjusting hydraulic pressure accordingly. This closed-loop control ensures that fine coffee grounds are adequately wetted and extracted without creating conditions that would lead to filter obstruction, as the system responds to actual flow conditions in real-time.
3Stress or pressure
If mechanical compression is used to increase pressure, then water thrust is counteracted, but system complexity and sealing member stress increase
Solution Approach 1:
The patent replaces mechanical compression means with a hydraulic system. Instead of using mechanical levers, springs, or pistons to generate pressure, the system uses a hydraulic pump with fluid power transmission. This substitution simplifies the mechanical structure while providing more precise and controllable pressure application, reducing stress on sealing members and overall system complexity.
4Productivity
If pressure above 10 bar is used to prevent filter obstruction, then water flow is maintained, but beverage quality deteriorates
Solution Approach 1:
The patent uses dynamic pressure control to maintain water flow without exceeding quality thresholds. The hydraulic system continuously adjusts pressure based on flow sensor feedback, ensuring adequate water passage through the coffee powder while preventing the excessive pressure (above 10 bar) that would compromise beverage quality. This dynamic adjustment allows the system to operate at optimal pressure levels throughout the extraction process.
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 based on detected pressure values, maintaining the nominal dispensing time and preventing filter obstruction, thereby enhancing the extraction process.
Implementation Method 1
a pressure sensor arranged along the hydraulic circuit and adapted to generate a control signal representative of the pressure detected
Implementation Method 2
a pump for generating pressure in the container
Data Source
AI summary
A coffee machine for producing and dispensing coffee-based beverages is disclosed comprising a hydraulic pump, at least one dispensing device with a filter unit adapted to contain ground coffee, and a water supply unit. A hydraulic circuit brings the hydraulic pump into fluid communication with the supply unit of the dispensing device to supply hot water under pressure to the supply unit. A system for controlling the dispensing pressure comprises a control unit and a pressure sensor to transmit signals representative of the pressure detected to the control unit to detect the disposing pressure. The hydraulic pump supplies variable quantities of water and may be actuated by an electronic drive controlled electronically by the control unit in order to select the flow of water supplied by the pump. A method for controlling the dispensing pressure in a coffee machine is also disclosed.