Coffee extraction device and method
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Solution Overview
Problem
Coffee extraction devices face blockage issues when high-pressure water and steam are supplied to coffee capsules, leading to inefficient extraction and potential safety hazards due to the compression of coffee powder, which can cause pump failure and require discarding of capsules.
Innovation Solution
A coffee extraction device equipped with a flow rate sensor and control unit that manages pump operation by stopping and re-driving the pump when a low flow rate is detected, applying varying voltages to address blockages and notify users of abnormal extraction functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-pressure water and steam is supplied to coffee powder in capsules, then coffee extraction efficiency is improved, but blockage phenomenon occurs and extraction function deteriorates
Solution Approach 1:
The pump operates in periodic cycles: initial driving at high pressure to achieve extraction, then stopping to allow pressure release and prevent blockage, and redriving when needed. This periodic operation pattern resolves the contradiction by alternating between high-pressure extraction phase and pressure-release phase, maintaining both extraction efficiency and extraction function reliability
2Speed
If high pressure is applied to coffee powder, then extraction speed is improved, but blockage phenomenon occurs and pump reliability deteriorates
Solution Approach 1:
The pump operates periodically with initial driving at high pressure for fast extraction, then stops to prevent excessive pressure accumulation and blockage formation. This periodic operation maintains extraction speed while preventing pump failure from excessive load
Solution Approach 2:
The system applies preliminary anti-action by stopping the pump before blockage can fully develop and before excessive pressure damages the pump. The control unit monitors and interrupts the high-pressure process preemptively to prevent harmful effects
3Duration of action of moving object
If pump is continuously operated to maintain extraction function, then coffee extraction continues, but blockage phenomenon worsens and extraction function is lost
Solution Approach 1:
Instead of continuous operation, the pump operates periodically with intentional stop periods. This allows pressure to equalize and prevents blockage while maintaining overall extraction function throughout the process
4Productivity
If high-pressure operation is maintained, then extraction efficiency is improved, but safety hazards increase due to potential water and steam release
Solution Approach 1:
The periodic stopping of the pump creates pressure release intervals that prevent dangerous pressure buildup, thereby maintaining extraction efficiency while eliminating safety hazards from uncontrolled water and steam release
Solution Approach 2:
The system beforehand cushions potential safety hazards by stopping the pump in advance before dangerous pressure levels can develop, preventing the harmful effect of uncontrolled release
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
This solution allows for stable coffee extraction by changing the pressure of water and steam supplied to the capsule, determining and removing blockages, and preventing safety hazards by managing pump operation and user notification.
Implementation Method 1
a pump pressurizing water and supplying the water to the coffee extraction unit
Implementation Method 2
a heater installed on a flow path between the pump and the coffee extraction unit to heat the water supplied to the coffee extraction unit
Data Source
AI summary
Provided are a coffee extraction device and a coffee extraction method, which are capable of extracting coffee from a coffee capsule (capsule coffee) and the like. The coffee extraction device can comprise: a coffee extraction unit on which a coffee capsule is to be mounted; a pump for pressurizing water and supplying the same to the coffee extraction unit; a flow rate sensor for measuring the flow rate of water to be supplied to the coffee extraction unit; and a control unit for controlling the operation of the pump on the basis of the flow rate to be sensed at the flow rate sensor.