Coffee Machine Self-Cleaning Conduit Using Presence Detection
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Solution Overview
Problem
Coffee machines often produce coffee with water contaminated by stuck and encrusted ground coffee residues on the conduit, leading to reduced coffee quality and increased difficulty in cleaning, especially when not cleaned frequently enough.
Innovation Solution
A coffee machine equipped with a presence sensor that automatically initiates a cleaning cycle when the filter holder is uncoupled, using a timer and switch to control the supply and heating device to flush out residues, ensuring clean water is always dispensed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual cleaning cycles are implemented, then coffee quality is maintained, but machine productivity decreases due to cleaning downtime
Solution Approach 1:
The coffee machine automatically performs cleaning cycles without user intervention. The control unit detects when cleaning is needed and activates the pump to flush the conduit, enabling the system to maintain itself autonomously while preserving both coffee quality and productivity
Solution Approach 2:
The system performs cleaning operations in advance or between coffee preparations automatically. By detecting filter holder removal or timing-based triggers, the system initiates cleaning before residues can significantly degrade coffee quality, eliminating the need to choose between cleaning and productivity
2Productivity
If cleaning cycles are delayed, then machine productivity is maintained, but residue encrustation increases making cleaning more difficult
Solution Approach 1:
The control unit monitors system state (filter holder presence, usage patterns) and automatically triggers cleaning cycles based on detected conditions. This feedback mechanism ensures cleaning occurs at optimal intervals, preventing encrustation while minimizing impact on productivity
Solution Approach 2:
The system implements periodic cleaning cycles triggered by usage counters or time-based intervals. This regular maintenance approach prevents residue buildup by systematically flushing the conduit at predetermined intervals, balancing cleaning effectiveness with operational continuity
3Reliability
If frequent cleaning is performed, then water quality remains high, but time loss increases
Solution Approach 1:
The automatic cleaning system operates without user intervention, performing flush cycles autonomously based on detected conditions. This eliminates the time users would spend manually initiating and monitoring cleaning operations while maintaining high water quality standards
Solution Approach 2:
The system performs brief cleaning operations in advance or between coffee preparations. By triggering quick flush cycles when the filter holder is removed or after a set number of beverages, the system maintains water quality without requiring extended cleaning time that would disrupt service
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 automatic cleaning cycle ensures that the conduit is cleaned every time coffee is dispensed, maintaining water quality and reducing downtime, as the machine can clean faster than a user could manually, preventing residue buildup and encrustation.
Implementation Method 1
it comprises a presence sensor to detect the presence of the filter holder under the conduit
Implementation Method 2
a switch connected to the control unit, to the supply and heating device and to the dispensing unit in order to enable the passage of electrical current
Implementation Method 3
a supply and heating device connected to the dispensing unit to supply hot water to the dispensing unit
Data Source
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AI summary
A coffee machine (100) comprises: a body (C), a dispensing unit (7), a conduit (8), a supply and heating device (R), a filter holder (9), fast coupling/uncoupling means (9a) to couple the filter holder (9) under the conduit (8), a control unit (13), a presence sensor (15) to detect the presence of the filter holder (9) under the conduit (8), a switch (17) to enable the passage of electrical current towards the supply and heating device (R) and towards the dispensing unit (7) when the presence sensor (15) detects that the filter holder (9) is uncoupled from the fast coupling/uncoupling means (9a); the control unit (13) comprises a timer (18) to manage the opening/closing of the switch (17).