Espresso Brew Unit Suction Return for Residual Coffee Leakage
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Solution Overview
Problem
Prior art espresso coffee makers experience residual coffee leakage after brewing, leading to quality loss and potential scalding hazards due to uncontrolled coffee flow from the coffee outflow duct when the crema valve is closed.
Innovation Solution
An espresso coffee maker with a return-flow suction unit connected to the coffee outflow duct, which is automatically activated at the end of the brewing process to suck off residual coffee, utilizing a movable brew chamber element and suction piston to drain coffee into a collecting vessel without operator intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the crema valve is closed to finish the brewing process, then the brewing function is completed, but residual coffee remains in the coffee outflow duct causing leakage and quality loss
Solution Approach 1:
The suction piston is activated immediately after the crema valve closes to remove residual coffee from the outflow duct before it can leak. This preliminary cleaning action prevents the harmful effect of residual coffee accumulation and subsequent leakage, resolving the contradiction between completing brewing and preventing contamination.
Solution Approach 2:
The suction unit extracts and removes the residual coffee from the coffee outflow duct through the suction channel. By taking out the harmful residual coffee substance, the system prevents leakage and quality loss while maintaining reliable brewing function completion.
2Object-generated harmful factors
If a return-flow suction unit is added to remove residual coffee, then residual coffee leakage is prevented, but device complexity increases
Solution Approach 1:
The suction piston is integrated with the movable brew chamber element, combining two functions into one component. The suction channel is formed within the brew chamber structure itself, merging the brewing chamber and suction system into a unified design. This reduces overall device complexity while effectively preventing residual coffee leakage.
Solution Approach 2:
The movable brew chamber element serves dual functions: it performs the brewing operation and simultaneously acts as the suction piston to remove residual coffee. This multi-functionality eliminates the need for separate dedicated suction mechanisms, reducing device complexity while maintaining effective leakage prevention.
3Reliability
If manual intervention is required to clear residual coffee, then coffee quality can be maintained, but ease of operation deteriorates
Solution Approach 1:
The system automatically performs the cleaning function through the suction piston that is mechanically coupled to the brewing mechanism. The suction action is triggered automatically by the movement of the brew chamber element, requiring no operator intervention. This self-service capability maintains espresso quality while significantly improving ease of operation.
Solution Approach 2:
The suction mechanism is activated through feedback from the brewing process itself. The movement of the brew chamber element during normal operation automatically triggers the suction piston to clear residual coffee, creating a self-regulating system that maintains quality without requiring operator attention or manual intervention.
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
Prevents uncontrolled coffee flow and residual coffee leakage, ensuring cleanliness and safety by automatically removing coffee residue after brewing, thus maintaining espresso quality and preventing scalding risks.
Implementation Method 1
a suction piston (23) that is movable within a suction cylinder (22), in particular forming a movable wall of the suction cylinder (22)
Implementation Method 2
The movement is also used to drive the return-flow suction unit that is disposed outside the brew chamber adjacent to the movable brew chamber element
Data Source
AI summary
In an espresso coffee maker having an espresso brew unit (1) and a coffee outflow duct (18) in fluid-conductive connection with the espresso brew unit via a crema valve (15) and having an end sided coffee outflow (19), no brewed residual coffee should remain in the coffee outflow duct nor leak out, for instance as leakage, through the coffee outflow. In order to avoid this, a return-flow suction unit (21), which is preferably independent except for a drive means, is in fluid-conductive connection with the coffee outflow duct (18) between crema valve (15) and coffee outflow (19), which is automatically activated when a brewing process is finished.