Beverage dispensing apparatus and method for active pressure control thereof
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Solution Overview
Problem
Beverage dispensing machines face challenges in achieving optimal brewing pressure and temperature control, leading to potential uncontrolled bursting of drink packs and suboptimal flavor extraction, especially at high altitudes where water boiling point is lower.
Innovation Solution
A beverage dispensing apparatus with a controller that adjusts fluid pressure and temperature settings based on the selected beverage type and ambient conditions, using pressure sensors and flow rate measurements to maintain optimal brewing pressure and temperature, preventing uncontrolled bursting and ensuring consistent flavor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure release valve is provided to ensure pressure does not exceed the bursting point, then pack safety is improved, but brewing pressure is reduced below optimal levels for strong flavors
Solution Approach 1:
The pressure release valve is designed to dynamically adjust its release characteristics based on the brewing cycle phase. During the brewing phase, the valve maintains higher pressure tolerance to enable strong flavor extraction, while during idle phases it prevents dangerous pressure accumulation. This dynamic behavior allows the system to achieve both safety and optimal brewing pressure.
Solution Approach 2:
The system changes the operational parameters of the pressure release valve based on different brewing conditions. By adjusting the valve's activation threshold and response characteristics according to the specific drink being prepared, the system can maintain optimal brewing pressure for strong flavors while still preventing dangerous pressure buildup that would cause uncontrolled bursting.
2Strength
If brewing time is extended to achieve stronger flavors at lower pressure, then flavor extraction is improved, but user satisfaction deteriorates due to unacceptable preparation time
Solution Approach 1:
The system employs periodic pressure cycling during the brewing process, alternating between high-pressure extraction phases and brief pressure relief phases. This periodic action allows strong flavor extraction to occur during high-pressure intervals while preventing dangerous pressure accumulation, achieving both flavor strength and acceptable brewing time.
Solution Approach 2:
The pressure release valve operates continuously at low levels during brewing to maintain optimal pressure, rather than allowing pressure to build up and then releasing it in discrete intervals. This continuous subtle pressure management enables sustained strong flavor extraction throughout the brewing process without requiring extended brewing time.
3Strength
If high pressure packs are used to achieve stronger flavors, then flavor extraction is improved, but device complexity increases due to additional physical support requirements
Solution Approach 1:
The pressure release valve is integrated directly into the pack design, allowing the pack to self-regulate its own pressure during brewing. This eliminates the need for external mechanical support structures, as the pack's built-in pressure management system handles both flavor extraction and safety functions independently.
Solution Approach 2:
The pressure release valve serves multiple functions simultaneously: it enables strong flavor extraction by maintaining optimal brewing pressure, prevents dangerous pressure buildup, and eliminates the need for separate mechanical support structures. This multi-functionality reduces overall device complexity while achieving the desired flavor strength.
4Reliability
If water temperature is lowered to prevent boiling at high altitude, then safety is improved, but brewing quality deteriorates
Solution Approach 1:
The system pre-heats water to a temperature higher than the local boiling point before introducing it to the brewing chamber. The brief exposure to this higher temperature initiates the brewing process and extracts flavors effectively, while the subsequent pressure management prevents sustained boiling, thus maintaining both safety and brewing quality.
Solution Approach 2:
The system maintains continuous heat application during brewing, compensating for the lower ambient temperature at high altitudes. This continuous heating ensures that the water remains at optimal brewing temperature throughout the process, preventing quality deterioration even though the water cannot reach its normal boiling point.
5Strength
If water temperature is increased to improve brewing quality, then flavor extraction is improved, but the risk of water boiling increases at high altitude
Solution Approach 1:
The system dynamically adjusts the heating power and water flow rate based on altitude detection. At high altitudes, the heater operates at higher power to compensate for the lower boiling point, while the flow rate is adjusted to ensure water passes through the coffee grounds quickly enough to extract flavors before boiling occurs, thus maintaining flavor extraction while preventing harmful boiling.
Solution Approach 2:
The system maintains continuous, optimized heating throughout the brewing process to ensure water reaches and maintains the optimal extraction temperature. By combining this continuous heating with precise pressure management, the system achieves effective flavor extraction while preventing uncontrolled boiling even at high altitudes where the boiling point is lower.
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 allows for precise control of brewing pressure and temperature, preventing pack bursting and enhancing flavor extraction, while accommodating altitude changes, thus improving the quality and efficiency of beverage preparation.
Implementation Method 1
A beverage dispensing apparatus with a controller that adjusts fluid pressure and temperature settings based on the selected beverage type and ambient conditions, using pressure sensors and flow rate measurements
Implementation Method 2
The controller may be configured to adjust a temperature setting of a heater, which heats fluid used for preparing beverages, based on a measurement of an ambient temperature
Implementation Method 3
a pressure release valve set at 9.5 psi protects the machine from causing packs, which may burst at pressures in excess of 9.5 psi, from bursting
Data Source
AI summary
A beverage dispensing apparatus includes a water tank, a water supply line connected to the water tank and having a water pump for pumping water from the water tank to a water outlet at a distal end of the water supply line, wherein the water outlet is connectable to a beverage ingredient container, a pressure sensor connected to the water supply line at a position upstream of the water outlet, and a controller configured to receive an output from the pressure sensor indicative of the pressure at the position upstream of the water outlet and to determine an estimated pressure at the water outlet based on the received output and a flow rate of water through the water supply line.