Aircraft Beverage Maker Pressure-Based Overflow Interlock System
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Solution Overview
Problem
Aircraft beverage maker devices are at risk of overflow due to software or electrical sensor malfunctions, which can cause solenoids to remain open indefinitely, leading to overflow of the platen drain system, as existing technologies lack effective overflow prevention mechanisms.
Innovation Solution
The beverage maker device incorporates a housing with a water tank, solenoid valves, and a process control board (PCB) equipped with pressure transducers and an overflow mitigation circuit that monitors flow pressure and limits water dispensation to prevent overflow by determining differential pressure and controlling solenoid valves based on sensed pressure signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure transducers and differential pressure monitoring are added to monitor water flow, then overflow prevention capability is improved, but device complexity increases
Solution Approach 1:
A restriction orifice is introduced as an intermediary component in the water flow path. This orifice creates a measurable pressure differential that serves as an indirect indicator of water flow rate and volume. By monitoring pressure rather than directly measuring flow, the system achieves reliable overflow detection without requiring complex flow meters or sensors, thus improving reliability while minimizing the increase in device complexity.
2Measurement precision
If dual pressure transducers are plumbed on either side of the restriction orifice to measure differential pressure, then flow measurement precision is improved, but manufacturing complexity increases
Solution Approach 1:
The pressure measurement function is segmented into two separate pressure transducers positioned at different locations (inlet and outlet) of the restriction orifice. Each transducer independently measures static pressure at its location, and the control system computes the differential pressure by subtracting one reading from the other. This segmentation approach improves measurement precision by allowing independent calibration and compensation of each sensor, while simplifying manufacturing compared to integrating a single complex differential pressure sensor.
3Reliability
If the overflow mitigation circuit continuously monitors differential pressure and controls solenoid valves, then safety is improved, but energy consumption increases
Solution Approach 1:
The overflow mitigation circuit employs periodic sampling of differential pressure rather than continuous monitoring. The control system takes pressure readings at predetermined time intervals during the water dispensing operation, determines the instantaneous flow rate based on the pressure differential, and integrates these periodic measurements to track cumulative water volume. This periodic action approach maintains safety by detecting overflow conditions while significantly reducing energy consumption compared to continuous real-time monitoring, as the pressure transducers and control processing are activated only at discrete sampling moments.
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 effectively prevents overflow by tracking flow volume based on pressure and controlling solenoid valves, ensuring safe operation even in the event of software or sensor failures, and can function at any angle, enhancing safety and reliability.
Implementation Method 1
Within the inlet body are plumbed two pressure transducers, on either side (e.g., tank-side and coupling-side) of a restriction orifice. The tank-side and coupling-side pressure transducers sense flow pressure on their respective sides of the restriction orifice and generate tank-side and coupling-side flow pressure signals.
Data Source
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Figure 2B
AI summary
A beverage maker device is disclosed. In embodiments, the device includes an external housing and a water tank (202) coupled to a water supply via an inlet (222). The beverage maker includes a manifold (204) within the housing, the manifold controlling the dispensing of the water into a server or through a faucet via solenoid valves. The beverage maker includes a pressure transducer (224) coupled to the inlet and capable of sensing a flow pressure of the water through the inlet, sending a pressure signal to the beverage maker control circuitry (402) based on the determined flow pressure. The control circuitry receives the pressure signal and determines a flow volume of the water through the inlet based on the flow pressure; if the flow volume reaches a flow threshold, the control circuitry cuts off the flow of water via the solenoid valves.