Rotating Brewing Unit With Variable Chamber Volume and Low Shaft Stress
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Solution Overview
Problem
Existing brewing units for automatic beverage machines lack the ability to handle variable brewing chamber volumes and multiple doses or beverage qualities in a single operation, leading to inefficiencies and increased mechanical stress on the motor shaft.
Innovation Solution
A brewing unit with a rotating mechanism featuring a seat, piston, and counter-piston, controlled by cam members that allow for multiple brewing positions and volumes, effectively managing brewing chamber stresses without auxiliary blocking members, thus enabling the production of different beverage qualities and quantities without torsional stress on the motor shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a brewing unit uses a motor assembly to actuate the opening and closing mechanism of the brewing chamber, then the brewing chamber can be opened and closed for beverage preparation, but the pressure forces generated during brewing create torsional stress on the motor shaft, reducing reliability
Solution Approach 1:
The patent extracts the force-bearing function from the motor assembly by introducing a separate blocking device that independently supports the brewing chamber during pressure generation. The motor assembly retains only the opening/closing actuation function, while the blocking device handles the pressure forces, eliminating torsional stress on the motor shaft.
Solution Approach 2:
The blocking device acts as an intermediary between the brewing chamber and the motor assembly. It mediates the force transmission by providing a separate load path for pressure forces, preventing them from reaching the motor shaft while still allowing the motor to control the brewing chamber positioning.
2Adaptability or versatility
If a brewing unit is designed with a fixed brewing chamber volume, then the structure is simpler, but it cannot produce different beverage qualities or multiple doses in a single operation
Solution Approach 1:
The patent implements a dynamic brewing chamber volume system where the brewing chamber can assume multiple positions corresponding to different volumes. The blocking device can be positioned at different locations along the brewing chamber's path of movement, allowing the same mechanical structure to accommodate various beverage types (espresso, fresh brew, etc.) and quantities (single or double doses) without increasing overall device complexity.
3Force
If auxiliary blocking members are added to manage brewing chamber stresses, then mechanical stress on the motor shaft is reduced, but the device complexity increases
Solution Approach 1:
The blocking device is designed with multi-functionality, serving both as a stress-bearing element and as a positioning mechanism for different brewing volumes. By integrating these functions into a single device rather than adding separate auxiliary members, the patent reduces device complexity while still effectively managing mechanical stresses on the motor shaft.
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 allows for the production of various beverage qualities and quantities, such as espresso and fresh brew, in a single brewing operation, while minimizing mechanical stress on the motor shaft, enhancing operational efficiency and flexibility.
Implementation Method 1
cam members for controlling the movements of the seat, of the piston, and of the counter-piston
Data Source
AI summary
A brewing unit includes a seat capable of a rotation movement, in which a piston is slidably received. A counter-piston co-operates with the seat and the piston to define a brewing chamber. Moreover, cam members are provided to control movements of the seat, the piston, and the counter-piston. The seat, the piston and the counter-piston can assume with respect to one another at least one position of charging of a product for preparation of the beverage, at least two distinct brewing positions which correspond two different volumes of the brewing chamber, and a position for discharging the spent product.