Brewing Unit Bypass Valve Layout for Multi-Style Coffee Output
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Solution Overview
Problem
Existing espresso coffee machines lack the ability to consistently produce multiple types of coffee beverages, such as espresso with crema and simple coffee without foam, due to the reliance on spring-loaded valves that require precise manufacturing and are not easily adjustable for varying flow rates and pressures.
Innovation Solution
Incorporating a parallel atmospheric coffee beverage bypass channel with adjustable valve plungers that allow for selection between espresso with crema and simple coffee, using two spring-loaded pressure valves with different activation pressures to control the flow, enabling the production of espresso, simple coffee, and 'Schümli' coffee with floating foam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring-loaded pressure valve is used to build up pressure for espresso crema, then the crema quality is improved, but the ability to produce other coffee beverages without foam or with floating foam is lost
Solution Approach 1:
The brewing system is segmented into two separate pressure control paths: one path with a first pressure valve (e.g., 5 bar) for espresso crema, and another path with a second pressure valve (e.g., 2 bar) for floating foam coffee. This segmentation allows independent control of pressure for different beverage types, resolving the contradiction between maintaining reliable crema quality and enabling beverage versatility.
Solution Approach 2:
The system dynamically switches between different pressure valve configurations based on the selected coffee beverage type. A switching mechanism selects which pressure valve to activate, allowing the system to adapt its pressure characteristics in real-time to match the desired beverage outcome, whether crema, floating foam, or no foam.
2Ease of operation
If a control valve device is used to vary the amount of coffee beverage passing per time unit, then the flow rate control is improved, but the manufacturing precision and long-term reliability are compromised
Solution Approach 1:
Instead of varying the outlet cross-section of a control valve (which requires high manufacturing precision), the system changes the pressure parameter using spring-loaded pressure valves with different set pressures. This approach trades cross-sectional precision for pressure control precision, which is easier to achieve and maintain over time, while still providing effective flow rate control for different beverage types.
3Ease of operation
If a control valve device is used to vary the initial stressing force of the spring, then the flow rate adjustment is improved, but the device complexity and installation volume increase
Solution Approach 1:
Rather than creating a complex adjustable valve device, the system segments the pressure control into separate, fixed-pressure valve units. Each valve is simple and self-contained, and the switching between them adds minimal complexity while providing effective flow rate adjustment for different beverage types.
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 the reliable and long-term production of various coffee beverages with desired foam characteristics by maintaining constant flow rates and pressures, allowing users to easily switch between crema and foam-free coffee options without altering the existing valve configurations.
Implementation Method 1
the pressure in the brewing head is increased as a consequence of the inflowing brewing water until the check valve opens and the coffee beverage may flow through
Implementation Method 2
a spring-loaded ball or a ball end arrangement and are suited to build up in the brewing chamber a pressure of at least about 5 bar
Data Source
AI summary
A brewing unit (1) of an espresso coffee machine including a brewing chamber (25) and at least one spring-loaded pressure valve (16) which is flow-technically arranged between the brewing chamber (25) and a coffee beverage outlet and which opens when the brewing chamber pressure exceeds a structurally predetermined value. In order to produce by means of the coffee machine one kind of coffee beverage selected from at least two kinds of coffee beverages, an atmospheric coffee beverage bypass channel (21) flow-wisely disposed in parallel relative to the pressure valve (16) between the brewing chamber (25) and the coffee beverage outlet (23) may be locked depending on the kind of coffee beverage selected.