Coffee Machine Flow Control for Gradual Crema Valve Opening
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Solution Overview
Problem
Conventional coffee brewing methods result in sudden and high-pressure dispensing of coffee, leading to potential spills and scalding, due to unpredictable crema valve opening, which compromises crema quality and flavor distribution.
Innovation Solution
A method involving controlled volume flow variations during brewing, with distinct phases of water supply to the brewing chamber, ensuring gradual crema valve opening and consistent brewing pressure, utilizing a crema valve with a mechanical restoring device to manage the outlet flow, and employing a pump control device for precise flow regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If brewing water is supplied at high flow rate to build pressure quickly, then brewing time is reduced, but crema valve opens suddenly causing high-pressure dispensing and potential spills
Solution Approach 1:
The brewing water supply is divided into multiple phases with different flow rates. A first volume flow supplies water during a first time period to build initial pressure, followed by a second volume flow during a second time period to maintain pressure. This periodic variation in flow rate prevents sudden pressure spikes that would cause the crema valve to open abruptly, while still achieving complete coffee extraction within a reasonable time.
Solution Approach 2:
The system dynamically adjusts the brewing water flow rate based on the brewing phase. The pump control device varies the volume flow from a first flow rate during the initial phase to a second flow rate during the subsequent phase. This dynamic control allows the system to build pressure gradually and maintain it steadily, preventing sudden crema valve opening while optimizing brewing efficiency.
2Stability of the object's composition
If brewing water supply is interrupted in pulsed manner to wet ground coffee completely, then wetting homogeneity is improved, but volume flow is reduced to zero during interruptions
Solution Approach 1:
The brewing process uses periodic water supply phases to achieve complete wetting of ground coffee. The first time period supplies water to initiate wetting, and the second time period continues water supply to ensure complete permeation. This periodic action ensures homogeneous wetting while maintaining continuous water flow, avoiding the productivity loss associated with complete flow interruptions.
3Stress or pressure
If crema valve opens suddenly due to pressure buildup, then brewing pressure is high for efficient extraction, but coffee shoots out at high speed causing spills and scalding
Solution Approach 1:
The pump control device dynamically adjusts the water supply flow rate to match the brewing phase requirements. During the first time period, a higher first volume flow builds necessary pressure for extraction. During the second time period, the flow rate is adjusted to a second volume flow that maintains pressure while preventing sudden spikes. This dynamic control ensures the crema valve opens gradually, allowing coffee to dispense at a controlled speed without shooting out and causing hazards.
4Productivity
If pump operates at nominal power throughout brewing cycle, then productivity is maximized, but brewing temperature may fluctuate and crema quality may be inconsistent
Solution Approach 1:
The pump control device implements periodic operation with distinct phases. During the first time period, the pump operates at a power level appropriate for initial water supply and pressure buildup. During the second time period, the pump operates at a different power level to maintain steady pressure and temperature for consistent crema formation. This periodic power adjustment ensures both brewing efficiency and reliable crema quality.
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 approach prevents sudden coffee dispensing, ensures consistent crema quality, and allows for optimal flavor extraction and aroma release, while maintaining a constant brewing temperature, thereby improving the overall coffee brewing process.
Implementation Method 1
at least part of the brewing water supply is used for the initial pressure build-up in the brewing chamber
Implementation Method 2
a spring-loaded crema valve being switched on in the coffee outlet line and opening automatically when pressure is applied
Implementation Method 3
If the water pressure inside the brewing chamber increases during a brewing process due to the brewing water supplied, such a known crema valve is pressed into its open position by the increasing pressure against the restoring force of the spiral spring
Implementation Method 4
the brewing water thus passing through the brewing chamber wets the ground coffee received in the brewing chamber, so that brewed coffee beverage can be dispensed at the chamber outlet
Data Source
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AI summary
The invention relates to a method for producing a coffee beverage in a brewing chamber (36) of a coffee machine (10) and to a coffee machine (10) for performing a method for producing a coffee beverage. The aim of the invention is to improve the dispensing of coffee, especially in its first phase, in order to avoid undesired splashing due to increased pressure of the coffee beverage at the coffee beverage outlet (47), According to the method of the invention, the brewing water is supplied to the brewing water inlet (35-1) of the brewing chamber (36) at a first volume flow rate during a first period of time (T1) of a first brewing phase (a), and during a second period of time (T2) of the first brewing phase (a), the brewing water is supplied to the brewing water inlet (35-1) of the brewing chamber (36) at a second volume flow rate, wherein the first volume flow rate and the second volume flow rate are both different from zero and wherein the second volume flow rate is lower than the first volume flow rate.