Brewing Chamber Piston Channel for Residual Liquid Evacuation
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Solution Overview
Problem
Full automatic coffee machines with bottom-up brewing chambers face issues such as residual liquid accumulation, contamination of the water supply line, and poor quality of the first cup of coffee due to thermal inertia and stagnant water, which existing solutions like three-way valves and electric heating resistances fail to adequately address without increasing maintenance and energy costs.
Innovation Solution
A coffee machine design featuring a brewing chamber with an upper and lower piston, where the lower piston has a piston rod with an internal channel for evacuating residual liquid directly to a waste collector, and pre-heating mechanisms to ensure optimal temperature for coffee preparation without using costly three-way valves or excessive energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a three-way valve is used to evacuate residual liquid through the water inlet pipe, then residual liquid can be drained from the brewing chamber, but the water supply line becomes contaminated with coffee residues and particles that clog the pipe
Solution Approach 1:
The invention separates the water supply function from the residual liquid evacuation function by creating a dedicated drainage outlet at the bottom of the brewing chamber that is independent from the water inlet pipe. This segmentation prevents coffee residues from contaminating the water supply line while maintaining reliable residual liquid evacuation capability.
Solution Approach 2:
The invention extracts the residual liquid evacuation function from the water inlet pipe system by providing a separate drainage outlet directly at the bottom of the brewing chamber. This extraction removes the harmful contamination pathway from the water supply line while preserving the ability to drain residual liquid effectively.
2Reliability
If a three-way valve is installed to drain residual liquid, then residual liquid evacuation is enabled, but the device complexity and cost increase
Solution Approach 1:
The invention extracts the drainage function from the complex three-way valve system and implements it through a simple dedicated outlet at the bottom of the brewing chamber. This simplification eliminates the need for complex valve mechanisms while maintaining effective residual liquid evacuation capability.
Solution Approach 2:
The invention replaces the expensive and complex three-way valve with a simple, low-cost drainage outlet structure that is easier to manufacture and maintain. This substitution reduces device complexity and cost while achieving the same functional goal of residual liquid drainage.
3Productivity
If the brewing chamber is not pre-heated, then energy consumption is lower, but the first cup of coffee has poor quality due to thermal inertia and cold chamber temperature
Solution Approach 1:
The invention implements pre-heating of the brewing chamber as a preliminary action before coffee preparation. By heating the chamber in advance, the system ensures optimal brewing temperature for the first cup of coffee, eliminating quality issues caused by thermal inertia while managing energy consumption through targeted pre-heating cycles.
4Temperature
If electric heating resistance is embedded in the brewing chamber, then the chamber can be pre-heated for optimal coffee temperature, but the construction becomes complex and maintenance becomes difficult
Solution Approach 1:
The invention extracts the heating function from the brewing chamber structure itself and implements it through a separate, removable heating element or external heating system. This extraction maintains temperature control capability while simplifying chamber construction and enabling easier maintenance without embedded heating resistance.
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
Effectively evacuates residual liquid without contaminating the water supply, maintains consistent coffee quality, and ensures the first cup is prepared at the optimal temperature, reducing energy consumption and maintenance needs.
Implementation Method 1
the piston rod comprises an internal channel extending from a channel inlet at the lateral wall surface of the rod to a channel outlet at the bottom wall surface of the rod
Implementation Method 2
Evacuation of the liquid happens during the evacuation of the cake of coffee powder
Implementation Method 3
pre-heating mechanisms to ensure optimal temperature for coffee preparation
Data Source
AI summary
The invention concerns a full automatic coffee machine (100) comprising a coffee extraction unit (10) with: —a brewing chamber (1) for receiving coffee powder, —an upper piston (2), —a lower piston (3) movable inside said brewing chamber (1) between a lowest position and a highest position —wherein the lower piston (3) comprises a piston rod (31), which comprises an internal channel (311) extending from a channel inlet (311a) at the lateral wall surface of the rod to a channel outlet (311b) at the bottom wall surface of the rod, and wherein the channel inlet (311a) is designed and positioned on the lateral wall surface of the rod so that said channel inlet (311a) overlaps the bottom wall (11) of the brewing chamber only when the lower piston is in the highest position.