Rotating Filter Cold Brew Extraction for Faster Mild Coffee
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Solution Overview
Problem
Existing coffee extraction methods, particularly the cold brew method, face challenges such as slow extraction speed, difficulty in maintaining coffee freshness, and the need for separate equipment for hot and cold brew methods, making it inconvenient for individuals to enjoy drip coffee.
Innovation Solution
A coffee extraction apparatus that simultaneously applies pressure through stirring and centrifugal force using a water turbine type filter, allowing for quick coffee extraction using the cold brew method, and is designed to be user-friendly with interchangeable extractors for both hot and cold brew methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the cold brew method is used to extract coffee, then the taste becomes mild and soft, but the extraction speed is slow
Solution Approach 1:
The filter basket rotates periodically to create vortex flow, enhancing contact between water and coffee powder. This periodic motion accelerates extraction while maintaining the gentle cold brew chemistry, resolving the contradiction between slow extraction speed and mild taste.
Solution Approach 2:
The apparatus uses water pressure and vortex flow dynamics to enhance extraction. By creating hydraulic movement through rotation, the system accelerates coffee compound dissolution without using heat, achieving fast extraction with cold water while preserving mild flavor.
2Ease of operation
If a separate cold brew machine is purchased, then cold brew coffee can be conveniently enjoyed, but the device complexity increases
Solution Approach 1:
The filter basket is designed to be interchangeable and compatible with both hot brew and cold brew extraction modes. This multi-functionality allows users to enjoy both hot and cold coffee varieties with a single machine, eliminating the need for separate equipment while reducing overall device complexity.
Solution Approach 2:
The system dynamically adapts between hot and cold brew modes by simply changing the filter basket and adjusting parameters. This dynamic flexibility allows one machine to serve multiple purposes, improving ease of operation without requiring multiple dedicated devices.
3Device complexity
If ground whole bean coffee powder is used, then the extraction process is simplified, but the freshness of coffee beans deteriorates
Solution Approach 1:
The system performs grinding immediately before extraction, eliminating the time gap between grinding and brewing. This preliminary action ensures coffee freshness is maintained while keeping the process simple, as the grinder is integrated into the extraction apparatus and operates right before water contact.
4Device complexity
If simple contact between water and coffee powder is used, then the device complexity is reduced, but the extraction speed cannot be remarkably shortened
Solution Approach 1:
The filter basket rotates periodically during extraction, creating continuous vortex flow that enhances water-coffee contact. This periodic mechanical action significantly accelerates extraction speed while maintaining relatively simple device structure, resolving the contradiction between simplicity and productivity.
Solution Approach 2:
The system replaces complex high-pressure or high-temperature mechanisms with simple rotational mechanics. The filter basket rotation creates sufficient vortex flow for fast extraction using basic mechanical motion, achieving high productivity without complex systems.
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
The apparatus significantly increases user convenience by enabling quick and efficient coffee extraction, maintaining coffee freshness, and allowing for easy switching between hot and cold brew methods without the need for separate equipment.
Implementation Method 1
a filter part that is configured to receive the coffee powder through the receiver inlet and that is configured to extract coffee liquid by rotating the coffee powder with water
Implementation Method 2
the coffee extraction apparatus can be configured to simultaneously apply pressure caused by stirring and pressure caused by centrifugal force using a filter of a water turbine type
Data Source
AI summary
A coffee extraction apparatus includes: a grinder grinding whole beans into coffee powder having a preset size or less and discharging the coffee powder, a grinder inlet defined at a first side of the grinder to introduce the whole beans to the grinder, a grinder outlet defined at a second side of the grinder and discharging the coffee powder, and a first extractor. The first extractor includes: a receiver inlet that faces the grinder and that receives the discharged coffee powder, a filter part receiving the coffee powder through the receiver inlet and extracting coffee liquid by rotating the coffee powder with water of a first temperature, the first temperature being equal to or lower than 25 degrees Celsius, and a receiver that receives the water of the first temperature and that is configured to store the water of the first temperature or the extracted coffee liquid.