Liquid Dispenser Integrity Sensor to Prevent Refill Contamination
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Solution Overview
Problem
Liquid dispensing systems, such as soap and sanitizer dispensers, can become contaminated if the seal of the container is breached during refilling, leading to bacterial growth in bulk refill or dispenser units if not maintained sanitarily.
Innovation Solution
A dispensing system with a sensor that monitors the integrity of the container and a controller that generates output signals to prevent fluid dispensing if the container integrity is breached, ensuring sanitary conditions by preventing refilling through the detection of light transmission changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the container is made refillable to reduce waste and cost, then productivity and economy are improved, but the risk of contamination and bacterial growth increases if the seal is breached
Solution Approach 1:
The integrity sensor is installed on the container before use to continuously monitor seal integrity. This preliminary monitoring action detects potential breaches before they lead to contamination, allowing preventive measures to be taken while maintaining refillable functionality
Solution Approach 2:
The system incorporates a feedback mechanism where the integrity sensor continuously reports container seal status to the control system. When a breach is detected, the system provides feedback to stop dispensing operations, preventing contaminated fluid from being dispensed and thus resolving the contradiction between refillability and contamination risk
2Reliability
If the system continuously monitors container integrity to prevent contamination, then sanitary conditions are improved, but device complexity increases due to additional sensors and controllers
Solution Approach 1:
The integrity monitoring function is extracted as a separate, dedicated sensor system rather than being integrated into the main dispenser mechanism. This modular approach allows for reliable contamination prevention while keeping the core dispensing system simple and the monitoring add-on relatively uncomplicated
Solution Approach 2:
An optical sensor is used as an intermediary device to detect container integrity breaches. The sensor acts as a mediator between the container seal and the control system, providing non-contact detection that simplifies the overall system architecture while maintaining high reliability in sanitary condition monitoring
3Measurement precision
If a light-based sensor is used to detect container breaches, then detection precision is improved, but the system may be affected by ambient light conditions
Solution Approach 1:
The optical sensor operates by emitting periodic light pulses through the container wall and measuring the transmitted light. This periodic action allows the system to distinguish between ambient light variations and actual seal breaches by comparing expected light transmission patterns with actual measurements, maintaining high detection precision while being resilient to ambient light interference
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 system effectively maintains sanitary conditions by preventing fluid dispensing when the container integrity is compromised, reducing the risk of bacterial growth and contamination in both bulk refill and dispenser units.
Implementation Method 1
detection of light transmission changes
Data Source
AI summary
An exemplary dispensing system includes a dispenser, an actuator, a sensor, and a controller. The dispenser includes a container for holding liquid, a liquid pump, an air pump, an outlet nozzle, and a foaming media. The actuator causes the dispenser to dispense liquid or foam. The sensor generates an input signal indicative of a status of the container. The controller receives the input signal, generates at least one output signal, and prevents the dispenser from dispensing liquid or foam if a breach is detected in the container.