Brewing unit with hydraulic stamping means and method for operating such a brewing unit
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Solution Overview
Problem
Existing brewing units for coffee and espresso machines require complex mechanical and fluidic systems, leading to increased space requirements and high control complexity, with spring-loaded brewing heads causing inconsistent substrate compression and external tampering needing additional forces and space.
Innovation Solution
A brewing unit with a cylindrical brewing chamber and a tamper connected to a hydraulic cylinder, where the brewing fluid fills the cylinder to move the tamper, applying a defined pressure via an automatic valve, allowing for compact design and automatic tamping without external devices, using the brewing fluid as both the actuating and pressurizing medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If spring-mounted brewing heads are used to compact the beverage substrate, then the brewing chamber can be closed and sealed, but the installation space becomes excessively large and the compression force becomes inconsistent
Solution Approach 1:
The patent replaces the spring-mounted brewing head with a hydraulically actuated brewing head that uses a hydraulic cylinder and piston. The hydraulic system provides consistent and controllable compression force through fluid pressure, eliminating the inconsistency caused by spring travel variations. The hydraulic cylinder can be designed with a compact form factor, reducing the overall installation space while maintaining precise control over the compression process.
Solution Approach 2:
The patent changes the actuation mechanism from mechanical springs to hydraulic pressure, allowing for precise control of the compression force parameter. By regulating the hydraulic pressure, the system can apply a consistent and reproducible tamping force regardless of the amount of coffee powder in the chamber, thereby improving compression consistency while enabling a more compact design.
2Ease of operation
If external tamping devices are used to compact the beverage substrate, then the tamping process can be performed, but additional forces and installation space are required
Solution Approach 1:
The patent merges the tamping function with the brewing head assembly, integrating the brewing chamber closure and substrate compaction operations into a single integrated unit. The brewing head itself performs the tamping action through its hydraulic actuation, eliminating the need for separate external tamping devices. This integration reduces installation space while maintaining ease of operation through automated hydraulic control.
3Extent of automation
If complex mechanical and fluidic systems are implemented in brewing units, then the brewing process can be controlled, but the device complexity and control effort increase
Solution Approach 1:
The patent uses a hydraulic system to simplify the control architecture. The hydraulic fluid serves as both the actuating medium for the brewing head and the pressurizing medium for the brewing process. This dual-use approach reduces the number of separate systems and components needed, thereby reducing overall device complexity while maintaining a high degree of automation in the brewing process 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
The solution enables a compact, robust brewing unit with consistent substrate compression and automatic process control, reducing installation space and operational complexity while ensuring reproducible brewing results.
Implementation Method 1
A working piston (31) can be mounted in the brewing head (5) in a hydraulically actuable manner, in particular in the form of a hydraulically movable plunger. A tamping element (8) can be connected to the working piston (31) such that a defined pressure can be applied to the beverage substrate (15) by means of the tamping element (8) and the working piston (31), in particular before the brewing process begins
Implementation Method 2
The brewing fluid can be used to fill the hydraulic cylinder (3), thereby moving a working piston (31) and thus also a connected tamping element (8) against the beverage substrate (15) present in the brewing chamber (2), thus compacting the beverage substrate (15) in a defined manner
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a brewing unit (1) for a beverage preparation device, in particular a coffee and/or espresso machine, with a brewing chamber (2) which is designed to receive a beverage substrate (15), in particular ground coffee powder, via an opening (7) of the brewing chamber (2) and has a brewing chamber base (2.2), preferably opposite the opening (7), and a brewing chamber shell (2.1) adjoining the brewing chamber base (2.2), preferably cylindrical, in particular limiting the opening (7), as well as with a brewing head (5) which has a tamping means (8) for compacting the beverage substrate (15), which is movably mounted relative to the brewing chamber (2) and is at least partially inserted into the brewing chamber (2) in a brewing position.wherein, when the tamper (8) is introduced into the brewing chamber (2), a linear movement of the tamper (8) along the brewing chamber shell (2.1) causes a compaction of the beverage substrate (15) between a contact surface (10) of the tamper (8) and a pressure surface (13) of a counterpart (14). According to the invention, the tamper (8) is connected to a brewing fluid supply (16) in a brewing fluid-conducting manner, wherein a hydraulic cylinder (3) of the brewing head (5) is also connected to the brewing fluid supply (16) in a brewing fluid-conducting manner, the working piston (31) of which is connected to the tamper (8) in such a way that filling the hydraulic cylinder (3) with brewing fluid (4) causes the tamper (8) to move towards the counterpart (14) and the tamper (8) applies a tamping pressure to the beverage substrate (15) via the contact surface (10).wherein the hydraulic cylinder (3) is arranged in a fluid-conducting manner between the brewing fluid supply (16) and the tamping means (8) and an automatic or self-controlled valve (6), preferably designed as a counter-pressure valve, is arranged at the transition between the tamping means (8) and the hydraulic cylinder (3) such that, upon reaching a brewing pressure in the hydraulic cylinder (3), it releases a closable fluid connection between the hydraulic cylinder (3) and the tamping means (8), so that in the open state of the valve (6) the brewing fluid (4) can flow from the hydraulic cylinder (3) into the brewing chamber (2), and the valve (6) regulates the outflow of the brewing fluid (4) into the brewing chamber (2) and is dimensioned and designed such that a defined tamping pressure can be applied to the beverage substrate (15) regardless of the amount of beverage substrate (15) in the brewing chamber (2).