Rotary stirring device for a beverage preparation machine provided with a magnetic coupling device
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Solution Overview
Problem
Existing beverage preparation machines with rotary stirring devices face challenges in intuitive coupling and detachment of tubular parts with drive shafts, leading to potential leaks and incorrect assembly due to complex coupling mechanisms.
Innovation Solution
A magnetic coupling device is used between the tubular part and the drive shaft, allowing for simple assembly and disassembly by magnetic attraction, along with anti-slip mechanical stops for secure alignment and an optical detection system to ensure proper coupling and prevent rotation issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex coupling device is used to connect the tubular section with the drive shaft, then the connection can be secured, but the assembly and disassembly process becomes non-intuitive and difficult to operate
Solution Approach 1:
The patent replaces the complex mechanical coupling device with a magnetic coupling system. The magnetic field provides secure connection while allowing intuitive assembly through simple approach-and-connect motion, and easy disassembly through pulling motion, eliminating the need for complex mechanical manipulation.
Solution Approach 2:
The patent changes the coupling mechanism from mechanical interlocking to magnetic attraction, fundamentally altering the physical parameter of the coupling force. This allows the connection to be both strong (high reliability) and easily controllable (high ease of operation) through magnetic field strength adjustment.
2Ease of repair
If a removable coupling device is used to facilitate cleaning, then the tubular section can be disassembled, but the connection may inadvertently detach during rotation or cause leaks under pressure
Solution Approach 1:
The magnetic coupling system replaces the removable mechanical coupling, providing continuous secure connection during rotation and pressure operation while still allowing easy separation for cleaning when needed. The magnetic force maintains reliable connection under dynamic conditions without the risk of inadvertent detachment.
Solution Approach 2:
The magnetic field acts as an intermediary force between the tubular section and drive shaft, providing a connection that is both secure during operation and easily separable for maintenance. This intermediary magnetic force eliminates the trade-off between connection stability and cleaning accessibility.
3Reliability
If the coupling device requires manipulation for assembly and disassembly, then the connection can be controlled, but the process becomes time-consuming and reduces productivity
Solution Approach 1:
The magnetic coupling system eliminates the need for manual manipulation of complex coupling mechanisms. Assembly is achieved by simply bringing components together where magnetic attraction automatically secures the connection, and disassembly requires only a pulling motion, dramatically reducing assembly time while maintaining connection 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 enhances user safety and efficiency by ensuring secure and intuitive coupling, preventing leaks, and facilitating easy cleaning and maintenance, while maintaining the integrity of the beverage preparation process.
Implementation Method 1
the second coupling device is a magnetic coupling device configured to generate a magnetic attraction force along axis A between a driving wall of the drive shaft and a receiving wall of the second end of the tubular part so as to transmit the rotational motion of the drive shaft to the rotating tool
Data Source
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Figure 3
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AI summary
The invention relates to a rotary stirring device (6) for a beverage preparation machine (1), comprising a rotating tool (7) about an axis A and a conduit (24) for conveying hot water and/or steam to the rotary tool, having a tubular portion (20) extending along the axis A between a first end (22) coupled to the rotary tool and a second end (23) coupled to a hollow drive shaft (12) by means of a magnetic coupling device (25) configured to generate a magnetic attraction force along the axis A between a driving wall (26) of the drive shaft and a receiving wall (27) of the second end of the tubular portion, so as to transmit the rotational motion of the drive shaft to the rotary tool, the second end of the tubular portion and the drive shaft each comprising a magnetic element or magnetizable.