Internal Coffee Machine Water Tank Overflow Routing to Drip Tray
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Solution Overview
Problem
Espresso machines lack efficient methods for regulating water pressure and volume during the brewing process and for controlling steam output, with existing needle valves requiring excessive rotation for full control and being cumbersome to use.
Innovation Solution
The implementation of a flow measurement apparatus with a pump power modification module for real-time pressure profiling and a steam control system using a ball valve with a rotating paddle, allowing for precise control of steam output with less than 180 degrees of rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a needle valve is used to control steam output, then variable steam output is achieved, but the valve requires numerous rotations and is cumbersome to operate
Solution Approach 1:
The patent changes the operational parameter of the valve from multi-rotation (needle valve) to single-rotation (ball valve). The ball valve design allows the steam output to be controlled by rotating the valve body less than 180 degrees, dramatically reducing the time and effort required for operation while maintaining variable steam output capability.
2Measurement precision
If an over pressure valve is used to regulate water pressure, then pressure control is achieved, but the delivered flow rate becomes difficult to measure accurately due to return flow
Solution Approach 1:
The patent segments the flow measurement into two separate measurements: feed flow (water entering the pump) and return flow (water returning from the over pressure valve). By using two independent flow meters, the system can accurately determine the net delivered flow by subtracting return flow from feed flow, solving the measurement problem caused by the over pressure valve's recirculation.
Solution Approach 2:
The system implements feedback measurement by continuously monitoring both feed flow and return flow, then calculating the net delivered flow in real-time. This feedback mechanism allows the system to accurately track the actual water delivery despite the complex pressure regulation path involving the over pressure valve.
3Productivity
If high pressure water delivery is used for espresso extraction, then extraction efficiency is improved, but pre-infusion stage cannot provide controlled low pressure wetting
Solution Approach 1:
The patent implements dynamic pressure control by modifying the pump power delivery during different stages of the brewing process. During pre-infusion, the pump operates at reduced power to provide controlled low pressure (1-5 bar) for gradual coffee bed wetting. During the extraction phase, full pump power is applied to achieve high pressure (9-10 bar) for efficient espresso extraction. This dynamic adjustment resolves the contradiction between needing low pressure for pre-infusion and high pressure for extraction.
Data Source
AI summary
A coffee making device has a body with a drip tray and a removable water tank that supplies water to a heat system of the device. The water tank is internal to the device and removable by a user. The body has a fluid refill opening that leads to the tank. The tank includes an overflow channel or conduit that dispenses into the drip tray.