Differential-Pressure Flow Meter for Beverage Maker Overflow Control
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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.
Innovation Solution
An overflow mitigation system that monitors flow pressure and volume, using a pressure transducer and control circuitry to prevent overflow by limiting the volume of water dispensed, even in the event of software or sensor failures, by integrating a differential-pressure flow meter and control circuitry to manage solenoid valves and track flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If software or electrical sensor malfunctions occur, then solenoids may remain open indefinitely, but this leads to overflow of the platen drain system
Solution Approach 1:
A differential pressure flow meter is introduced as an intermediary device between the water supply and the platen drain system. This flow meter independently monitors water flow through mechanical pressure differential measurement, providing a backup control mechanism that does not rely on software or electrical sensors. When the flow meter detects excessive flow conditions, it mechanically restricts flow through its internal mechanism, preventing overflow even when solenoid control fails.
Solution Approach 2:
The patent replaces reliance on electrical control systems (software and electrical sensors) with a mechanical flow monitoring and restriction system. The differential pressure flow meter uses purely mechanical principles (pressure differential across a restriction) to measure and control flow, eliminating the need for electrical sensors and software logic in the critical overflow prevention function.
2Measurement precision
If flow volume is tracked using software or electrical sensors, then overflow can be detected, but these systems are vulnerable to malfunctions
Solution Approach 1:
The patent replaces electrical or software-based flow measurement systems with a purely mechanical differential pressure flow meter. This device measures flow volume by calculating the pressure differential across a known restriction, using only mechanical components (pressure sensing elements, restriction orifice, calculation mechanism). This mechanical approach eliminates vulnerabilities to software bugs, electrical sensor failures, and electromagnetic interference while maintaining measurement precision.
3Reliability
If a differential-pressure flow meter is integrated to monitor flow pressure and volume, then overflow can be prevented, but device complexity increases
Solution Approach 1:
The differential pressure flow meter is designed to perform multiple functions within a single integrated device: it measures flow rate, tracks cumulative flow volume, provides overflow prevention, and can signal low-water conditions. By consolidating these functions into one multi-functional component rather than separate systems, the patent reduces overall system complexity while maintaining high reliability for overflow 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
Effectively prevents overflow at any angle by tracking flow volume based on pressure, ensuring safe operation even during software or sensor failures, and provides low-water protection and alert mechanisms for optimal performance.
Implementation Method 1
a differential-pressure flow meter plumbed into the water supply inlet and having a restriction orifice and pressure transducers on either side of the restriction orifice
Implementation Method 2
pressure transducers on either side of the restriction orifice to indicate a flow rate into the beverage maker device
Data Source
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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. 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 (206). Within the inlet body connecting the tank to the water supply 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 (410, 408) sense flow pressure on their respective sides of the restriction orifice and generate tank-side and coupling-side flow pressure signals. Within the housing a process control board (PCB) (208) includes control processors and control circuitry in communication with the solenoid valves. The PCB control processors determine a differential pressure associated with the water flow based on the received tank-side and coupling-side pressure signals.