Negative-Pressure Coffee Maker Filtration for Stable Extraction
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Solution Overview
Problem
Existing manual pressure type coffee makers struggle with controlling pressure, resulting in poor coffee taste and the risk of coffee powder being squeezed into the outer cup.
Innovation Solution
A manual pressure type coffee maker with a simple structure and convenient operation, utilizing an inner container with a sealing ring to form a closed space, creating negative air pressure to extract coffee liquid through a filter, and a driving device to facilitate easy operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the squeezing rod directly squeezes coffee in the inner cup into the outer cup, then the liquid is squeezed without forming air pressure, but the pressure during squeeze is not easy to control, the coffee obtained has a bad taste, and the coffee powder is easy to be squeezed into the outer cup
Solution Approach 1:
The patent introduces a pneumatic mechanism where the plunger pushes air through a one-way valve into a sealed inner cup containing coffee powder and water. This creates controlled air pressure that forces the liquid mixture through a filter into the outer cup, replacing direct mechanical squeezing with pneumatic pressure control.
Solution Approach 2:
The patent employs a filter made of porous material (filter paper or mesh) that allows liquid to pass through while blocking coffee powder particles. This porous barrier ensures that only extracted coffee liquid enters the outer cup, preventing powder contamination and improving coffee quality.
2Reliability
If a sealing ring is added to form a closed space for creating negative pressure, then coffee liquid can be sucked through the filter, but the device structure becomes more complex
Solution Approach 1:
The patent combines multiple functions into integrated components: the sealing ring simultaneously seals the inner cup and creates the closed space necessary for negative pressure generation; the filter serves both filtration and structural support functions; the one-way valve integrates pressure control and fluid direction in a single element.
Solution Approach 2:
Instead of pushing coffee out through direct squeezing, the patent uses negative pressure (suction) created by pulling the plunger outward to draw liquid through the filter. This inversion of the force direction enables controlled extraction while maintaining simplicity.
3Reliability
If the filter is pressed against the bottom wall of the inner container to cover the opening, then coffee powder is prevented from entering the outer cup, but the filter becomes difficult to clean
Solution Approach 1:
The patent divides the filter assembly into separable components: the filter is mounted on a filter holder that can be detached from the inner cup. This segmentation allows the filter to be easily removed for cleaning or replacement without disassembling the entire device, maintaining both separation effectiveness and ease of maintenance.
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 coffee maker effectively brews coffee using air pressure, producing coffee with rich foam and good taste, while preventing coffee powder from entering the outer cup, and allowing for easy cleaning and maintenance.
Implementation Method 1
when the inner container is pulled outwards, negative pressure is formed in the closed space so that liquid in the inner container cavity is sucked into the closed space through the filter
Data Source
AI summary
A manual pressure type coffee maker includes an outer cup body, the outer cup body is provided with a cup cavity with an open end, and with an inner container that can be inserted into and pulled out of the cup cavity from the open end, the technical points are the inner container is provided with an inner container cavity for containing brewing materials, the inner container is provided with a sealing ring that separates the cup cavity to form a closed space, and a bottom of the inner container cavity is provided with a filter communicated with the closed space, when the inner container is pulled outwards, negative pressure is formed in the closed space so that liquid in the inner container cavity is sucked into the closed space through the filter. The invention can brew coffee by negative pressure with a simple structure.