Coffee Machine Brewing Valve Layout Without Electrovalves
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Solution Overview
Problem
Existing coffee machines rely on expensive and complex electrovalves for directing water and steam, which are prone to scaling and malfunction, and require manual handling to prevent dry-out during mode changes.
Innovation Solution
A coffee machine design that uses mechanical third valve means operable by the relative displacement of closure piston bodies to selectively divert steam and hot water to a remote outlet, eliminating the need for electrovalves and ensuring automatic path closure during brewing, thereby preventing dry-out and malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electrovalves are used to direct water from the boiler to the brewing chamber or remote outlet, then the machine can selectively switch between coffee and steam production, but the device complexity and cost increase significantly
Solution Approach 1:
The patent replaces the electrovalve (electromechanical system) with a purely mechanical valve system actuated by the closure piston's relative movement. The first and second valve means are mechanically linked to the closure piston bodies, so that the piston's displacement during brewing automatically opens/closes the valves without requiring external electrical control signals.
Solution Approach 2:
The valve system is self-actuating through the closure piston's own movement. During the brewing cycle, the relative displacement between the first and second bodies of the closure piston automatically operates the first valve means to open for water flow and the second valve means to close for pressure maintenance, eliminating the need for external control systems.
2Adaptability or versatility
If electrovalves are used for mode switching, then selective feeding of steam and hot water is achieved, but the reliability decreases due to scaling and malfunction
Solution Approach 1:
The patent employs simple mechanical valve components that are less susceptible to scaling and can be easily replaced if needed. These basic mechanical valves lack the complex internal mechanisms of electrovalves that are prone to clogging with scale deposits, thereby improving long-term reliability.
Solution Approach 2:
By replacing electrovalves with mechanical valve means actuated by the closure piston, the system eliminates the electrical components and seals that are vulnerable to scaling. The mechanical valve design with simpler moving parts resists scale accumulation and maintains reliable operation in the hot water/steam environment.
3Reliability
If electrovalves are used to prevent dry-out during mode changes, then hydraulic path control is achieved, but the ease of operation deteriorates due to coordination requirements
Solution Approach 1:
The valve system automatically prevents dry-out through the inherent movement of the closure piston. When the brewing cylinder engages with the closure piston, the relative displacement automatically opens the first valve means for water supply and closes the second valve means to maintain pressure, ensuring continuous water flow without requiring manual intervention or coordination.
Solution Approach 2:
The mechanical linkage ensures that water supply is established before the brewing chamber is sealed. The first valve means opens in advance as the closure piston moves, ensuring water is already flowing into the brewing chamber before the second valve means closes to seal the chamber, thereby preventing dry-out conditions.
4Device complexity
If mechanical third valve means operable by closure piston displacement is used, then the device complexity is reduced and cost is lowered, but the automation level may be compromised
Solution Approach 1:
The third valve means is automatically actuated by the displacement of the closure piston bodies during the brewing cycle. The mechanical linkage converts the piston's linear movement into valve operation, providing automated control of the hydraulic path from the boiler to the remote outlet without requiring external actuators or control systems.
Solution Approach 2:
The patent combines the valve actuation function with the existing closure piston mechanism. The same mechanical movement that closes the brewing chamber also operates the first, second, and third valve means, merging multiple functions into a single integrated mechanical system that reduces overall complexity while maintaining automation.
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 solution provides a cost-effective, reliable, and automated system for switching between coffee and steam production modes, ensuring efficient operation and rapid temperature adjustments, while preventing dry-out and enhancing machine productivity.
Implementation Method 1
third valve means operable through the relative displacement between said first and second body, said third valve means being along a hydraulic circuit connecting said boiler to a hot water/steam delivery outlet remote from said brewing unit
Implementation Method 2
a brewing cylinder movable between a first position of disengagement from said closure piston for opening a brewing chamber defined therebetween and a second position of engagement with said closure piston for closure of said brewing chamber
Implementation Method 3
first valve means for feeding water from said boiler to said brewing chamber
Implementation Method 4
second valve means for release for pressure from said brewing chamber at the end of a coffee production, said second valve means being operable by the relative displacement of said second body with respect to said first body
Implementation Method 5
a boiler and a brewing unit... the boiler is set so as to increase the temperature of the water to above that desired for producing coffee
Implementation Method 6
downstream of said third valve means diversion means for selectively diverting the flow to said hot water/steam delivery outlet or to a discharge outlet
Data Source
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AI summary
A coffee machine comprising a boiler (3) and a brewing unit having a closure piston and a brewing cylinder (7) movable between a first position of disengagement from the closure piston for opening a brewing chamber defined therebetween and a second position of engagement with the closure piston for closure of the brewing chamber, the closure piston having a first body (4) hydraulically connected to the boiler (3) and slidably supporting a second body (5) movable along a translation axis by the brewing cylinder (7), first valve means (21) for feeding water from the boiler (3) to said brewing chamber, second valve means (23) for release for pressure from the brewing chamber at the end of a coffee production cycle, and third valve means (25) operable through the relative displacement between the first and second body (4,5), the third valve means (25) being along a hydraulic circuit connecting the boiler (3) to a hot water/steam delivery outlet (13) remote from the brewing unit, the hydraulic circuit having downstream of the third valve means (25) diversion means (6) for selectively diverting the flow to the hot water/steam delivery outlet (13) or to a discharge outlet (12).