Adjustable Brewing Valve for Multi-Pressure Coffee Preparation
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Solution Overview
Problem
Existing coffee machines are limited in their ability to produce beverages with varying brewing pressures, as they typically apply the same pressure for all drinks, which is inadequate for producing filter coffee, coffee cream, and espresso, each requiring different pressures.
Innovation Solution
A device with a valve that can be adjusted by a leaf spring with a sliding mechanism, allowing for adjustable brewing pressure within the brewing chamber, enabling the production of high-quality filter coffee, coffee cream, and espresso by varying the closing force of the valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed valve closing force is used, then the device structure is simple, but different beverage types requiring different brewing pressures cannot be produced
Solution Approach 1:
The valve closing force is made dynamically adjustable through a spring mechanism with variable preload. The spring force can be changed by adjusting the preload on the spring, allowing the brewing pressure to be adapted for different beverage types (filter coffee, coffee cream, espresso) without changing the basic valve structure.
Solution Approach 2:
The brewing pressure parameter is made variable by changing the spring force parameter. By adjusting the spring preload, the closing force of the valve changes, which directly controls the brewing pressure to match requirements for different beverage preparations.
2Adaptability or versatility
If brewing pressure is increased for all drinks, then espresso quality improves, but filter coffee and coffee cream cannot be produced properly
Solution Approach 1:
The system transitions from a static fixed-pressure valve to a dynamic adjustable-pressure valve. The spring mechanism allows continuous adjustment of the closing force, enabling precise control of brewing pressure to match the specific requirements of different beverage types.
Solution Approach 2:
The brewing pressure parameter is made variable through spring force adjustment. The spring constant and preload can be modified to achieve different pressure levels, allowing precise control for filter coffee (low pressure), coffee cream (medium pressure), and espresso (high pressure).
3Adaptability or versatility
If multiple valves with different closing forces are used, then different brewing pressures can be achieved, but the device becomes complex with multiple components
Solution Approach 1:
A single valve mechanism serves multiple functions by allowing adjustment of the spring preload. This one valve can produce different brewing pressures for various beverage types, eliminating the need for multiple separate valves with different closing forces.
Solution Approach 2:
The valve transforms from a fixed-function component to a multi-function component through dynamic adjustment of spring force. By changing the preload on the same spring, the valve can adapt to different brewing pressure requirements without requiring multiple valves.
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 production of coffee beverages with adjustable brewing pressures between 0 and 10 bar, ensuring optimal crema quality and preventing liquid leakage, while maintaining a simple and efficient design with minimal components.
Implementation Method 1
a valve which is coupled to a leaf spring whose spring force can be adjusted to close the valve
Data Source
Figure 1~2
Figure 3~4
AI summary
The device has a tank with fluid supplied to a brewing chamber by a pump, where the brewing chamber is closable over a valve and brewing pressure is adjustable based on prepared beverage. The valve is coupled with a leaf spring (5), where spring force for closing the valve is adjustable by a slider (7). The valve is arranged between the brewing chamber and an output for the beverage. A sealing element is fixed to the leaf spring for locking a flow line, and the brewing pressure is adjustable in a range between 0 to 10 bars.