Espresso Brew Flow Regulation for Pre-Wet and Extraction Control

The patent applies dynamics by transitioning from a static constant flow rate system to a dynamic variable flow rate system. The pump controller adjusts the pump motor speed throughout the brewing cycle, enabling the flow rate to change from a pre-wet phase to an extraction phase. This dynamic adjustment allows the system to achieve both high extraction speed during pre-wetting and precise flavor extraction during the brewing phase, resolving the contradiction between productivity and manufacturing precision.

The patent applies universality by making the existing pump motor perform multiple functions. The pump motor not only pressurizes water for brewing but also its speed is controlled to create variable flow rates for different brewing phases. The pump controller serves as a multi-functional component that manages both pressure regulation and flow rate variation. This approach achieves precise flavor extraction without adding separate complex flow rate control mechanisms, thereby improving manufacturing precision while minimizing the increase in device complexity.

The patent applies preliminary action by implementing a pre-wetting phase before the main extraction phase. During this preliminary phase, the pump operates at a lower flow rate to evenly saturate the coffee grounds with water. This preliminary saturation ensures that when the high-pressure extraction phase begins, the grounds are already properly prepared for optimal flavor extraction. This preliminary action improves reliability of extraction by ensuring complete grounds saturation, while the automated phase transition prevents excessive time loss by moving quickly to the extraction phase once pre-wetting is complete.