Coffee Machine Pre-Infusion Using Bypass Duct and Three-Way Valve
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Solution Overview
Problem
Existing espresso coffee machines face complexity and increased costs due to the need for sophisticated hydraulic circuits and multiple components to implement a pre-infusion step, which is essential for uniform extraction of aromatic substances but is not feasible in professional machines with multiple brewing groups without significant structural and operational complications.
Innovation Solution
A coffee machine with a simplified pre-infusion system using a three-way valve for each brewing group, allowing independent operation and reducing the number of components, where a feeding duct and a bypass duct can selectively communicate with the outlet duct to deliver water at either high or low pressure, enabling pre-infusion and post-infusion steps without additional pumps or boilers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a pre-infusion step with low-pressure water is implemented to achieve uniform wetting and homogeneous extraction of aromatic substances, then the quality of beverage is improved, but the device complexity and production costs increase due to the need for sophisticated hydraulic circuits and multiple components
Solution Approach 1:
The hydraulic circuit is segmented into a main line and a bypass line, allowing independent control of water flow paths. The bypass line branches off before the pump and rejoins after the pump, creating separate low-pressure and high-pressure pathways that can be selectively activated through valve control
Solution Approach 2:
The same hydraulic circuit and pump system serve multiple functions: they can deliver water at high pressure for the main infusion step and at low pressure for the pre-infusion step, eliminating the need for separate pumps or boilers for each function
2Productivity
If a pre-infusion system is added to achieve uniform wetting of coffee panel, then the extraction efficiency is improved, but the number of components and structural complexity increase
Solution Approach 1:
The pre-infusion step is implemented as a preliminary action before the main infusion, using low-pressure water to uniformly wet the coffee panel and release gases. This preliminary preparation enhances the subsequent high-pressure infusion by ensuring homogeneous water distribution and removing gas pockets that would otherwise impede extraction
Solution Approach 2:
The pre-infusion functionality is merged with the existing hydraulic circuit by utilizing the bypass line and valve control mechanisms already present in the system, rather than adding a completely separate pre-infusion system with its own pump and controls
3Productivity
If multiple brewing groups are operated simultaneously in professional coffee machines, then the productivity is improved, but the implementation of pre-infusion becomes infeasible due to operational complications
Solution Approach 1:
The hydraulic circuit is segmented into independent pathways for each brewing group, with each group having its own bypass line and valve assembly. This segmentation allows each brewing group to operate independently with its own pre-infusion cycle, enabling simultaneous operation of multiple groups without operational conflicts
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
The system allows for uniform wetting and extraction of aromatic substances while maintaining simplicity and reliability, enabling simultaneous operation of multiple brewing groups with reduced complexity and production costs, and allows for independent operation of each brewing group.
Implementation Method 1
a pump arranged in said hydraulic circuit, between said water source and said one or more brewing groups, and adapted to raise the pressure of the water circulating in said hydraulic circuit
Implementation Method 2
a boiler arranged in said hydraulic circuit, between said water source and said one or more brewing groups, and adapted to raise the temperature of the water circulating in said hydraulic circuit
Data Source
AI summary
A coffee machine is provided that comprises one or more brewing groups and that has a system for delivering water under reduced pressure at a step of pre-infusion of the coffee panel before the step of actual infusion and brewing of the coffee-based beverage. Each brewing group (3a, 3b) of the coffee machine (1), a secondary feeding duct (9a, 9b) in which water under higher pressure flows, and a secondary bypass duct (11a, 11b), in which water under reduced pressure flows, can selectively be communicated with the respective brewing group. The pre-infusion system of the coffee machine (1) allows effecting pre-infusion in each brewing group in a separate and independent manner.