Cartridge Coffee Maker Flow Control for Froth-Less Filter Coffee
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Solution Overview
Problem
Existing coffee makers that use cartridges for brewing coffee powder struggle to produce both espresso and filter coffee, as they often result in froth on filter coffee, which is not desired, and lack the ability to adjust brewing parameters for different coffee types.
Innovation Solution
A coffee maker design that includes a brewing chamber for cartridges, a pump for feeding hot water, and a throttle valve to control the flow rate of water, allowing for unpressurized brewing to prevent froth formation, with pre-punching of the cartridge's cover and bottom for filter coffee preparation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a coffee maker uses a pump to feed hot brewing water at high pressure into the cartridge, then espresso with froth can be produced, but filter coffee will have unwanted froth on its surface
Solution Approach 1:
The coffee maker dynamically adjusts the pump flow rate based on the selected coffee type. For filter coffee, the pump operates at a restricted flow rate to prevent froth formation, while for espresso, it operates at full flow rate to create the desired froth. This dynamic parameter adjustment allows the same device to produce different coffee types with appropriate characteristics.
Solution Approach 2:
The system changes the flow rate parameter of the pump according to the brewing mode. A throttle valve or flow control mechanism is used to restrict water flow when preparing filter coffee, thereby preventing excessive pressure that causes froth. For espresso, the flow restriction is removed or reduced, allowing high-pressure brewing and froth formation.
2Productivity
If the cartridge is punched before brewing to allow water flow, then brewing can proceed, but froth is formed on filter coffee which is not desired
Solution Approach 1:
The cartridge is pre-punched with holes in the cover and bottom before brewing begins. This preliminary action ensures that water can flow through the cartridge without excessive pressure buildup, preventing froth formation in filter coffee while still allowing efficient brewing. The pre-punched holes facilitate controlled water flow through the coffee powder.
3Loss of time
If the pump feeds a large amount of water quickly into the cartridge, then brewing time is reduced, but froth is formed on the coffee surface
Solution Approach 1:
The pump flow rate parameter is adjusted based on the brewing mode selected. For filter coffee, the flow rate is restricted to a lower value that prevents froth formation while still maintaining acceptable brewing time. For espresso, the full flow rate is used to create froth quickly. This parameter adjustment resolves the contradiction between brewing speed and froth prevention.
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
Enables the production of froth-less filter coffee with consistent taste, while maintaining the ability to make espresso with froth, by controlling water flow and punching mechanisms to suit different coffee types.
Implementation Method 1
a pump for feeding hot brewing water into the brewing chamber
Implementation Method 2
a throttle valve to control the flow rate of water, allowing for unpressurized brewing to prevent froth formation
Implementation Method 3
pre-punching of the cartridge's cover and bottom for filter coffee preparation
Data Source
AI summary
The coffee maker for brewing powder coffee contained in a cartridge comprises a brewing chamber adapted to receive the cartridge, at least one punching member for punching the cartridge and a pump for feeding brewing water into the brewing chamber. In order to avoid that the prepared coffee shows froth at its surface, the coffee maker comprises means for restricting the amount of water fed by the pump into the brewing chamber per unit of time. This means ensures that the brewing water flows through the cartridge essentially unpressurized.