Espresso Machine Bypass Pressure Control for Multi-Group Extraction
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Solution Overview
Problem
Existing espresso coffee machines face challenges in controlling extraction pressure effectively, particularly during the pre-brewing step, due to limitations in flow rate and complexity of hydraulic circuits, leading to non-optimal extraction and increased costs.
Innovation Solution
An espresso coffee machine design that utilizes a single pumping system in conjunction with electronically controlled bypass valves to manage extraction pressure across multiple dispensing groups, allowing for precise control without flow-rate limitations, enabling both manual and automatic pressure adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple pumping systems are used to control extraction pressure for each dispensing unit, then pressure control precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges multiple independent pumping systems into a single pumping system that serves all dispensing units. This single pump is controlled by an electronic control unit that regulates water flow to multiple groups, thereby reducing device complexity while maintaining pressure control capability through centralized management rather than distributed pumping systems
Solution Approach 2:
The single pumping system is designed to perform multiple functions by serving all dispensing units universally. The electronic control unit enables this universal system to provide precise pressure control for different groups simultaneously, making the single pump multi-functional rather than requiring dedicated pumps for each unit
2Adaptability or versatility
If a proportional valve is used to adjust flow rate for pressure control, then pressure adjustment capability is improved, but flow rate is limited by the valve's maximum flow rate
Solution Approach 1:
The patent introduces an electronic control unit as an intermediary between the single pumping system and the dispensing units. This electronic mediator regulates water flow and pressure distribution to multiple groups without the flow rate limitations of mechanical proportional valves, enabling both precise pressure adjustment and high flow rates by using electronic control rather than mechanical throttling
3Power
If lever mechanisms or hydraulic actuators are used to generate pressure, then pressure generation capability is improved, but device complexity and operational effort increase
Solution Approach 1:
The patent replaces mechanical pressure generation systems (levers, springs, hydraulic actuators) with an electrically driven pumping system. The pump is controlled by an electronic control unit that manages pressure generation electronically, eliminating complex mechanical linkages and manual operation while maintaining or improving pressure generation capability through electric motor control
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 solution enables precise and efficient control of extraction pressure, replicating the extraction profile of lever machines, while simplifying the system and reducing costs by eliminating the need for multiple pumping systems and complex electronic controls.
Implementation Method 1
a pump (28), with which it is possible to apply a predetermined pressure value to the water
Implementation Method 2
at least one heating element (16), belonging to said secondary boiler (14) and controlled by an electronic control unit (18)
Data Source
Figure 1
AI summary
An espresso coffee machine is described, comprising a main boiler, provided for producing hot water and steam, at least one dispensing group, provided for producing coffee, a secondary boiler provided to keep the water for dispensing coffee at a predetermined temperature value identified by a temperature probe, a main water inlet circuit for inletting water from the water supply network, hydraulically connected to the main boiler and to each secondary boiler and an electronic control unit. The main water inlet circuit comprises at least one booster pump that applies a predetermined pressure value to the water. The espresso coffee machine further comprises a pressure sensor, provided with a sensitive element embedded within the secondary boiler of each dispensing group and placed in contact with the water, a bypass circuit hydraulically connected, at a first end, to the main water inlet circuit upstream of the booster pump and, at the opposite end, to each dispensing group, and at least one two-way proportional valve, arranged on the bypass circuit and electronically controlled by the electronic control unit. The two-way proportional valve is configured to recirculate a part of delivery flow of the booster pump on the main water inlet circuit and upstream of the booster pump, in order to maintain a certain coffee extraction pressure value in each dispensing group set in real time by the pressure sensor.