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Product Description
The Touchless Hand Sanitizer Dispenser is the perfect workplace companion to keep you safe and healthy during the COVID-19 Pandemic. Equipped with an ultrasonic sensor, the device will sense your hand and dispense alcohol based sanitizer without you needing to touch a button. A 4 digit LED screen at the top allows the device to double as a clock as well, seamlessly blending in with the workplace. The injection molded design and implementation of thread forming screws allows easy removal of the top for repairs and refilling of the sanitizer that is made to outlast this pandemic.
Technical Specifications
The table top device stands 250mm tall and 150mm wide, at the top is a 4 digit LED screen to act as a timer. Below the overhanging section lies the dispersing nozzle and an ultrasonic sensor to detect a person's hands. The base of the device houses a clear container with a treaded screw cap, capable of holding 0.3 liters of liquid. Rising out of the container is a 1/4" flexible tube that loops into a peristatic pump, out to the overhanging part of the device. The peristatic pump moves the fluid using 12mm bearings that "pinch" the fluid though the tubing. A stepper motor precisely controls the rotation of the peristatic pump's internal rotor. to control device's electronics, a Arduino Uno is mounted to the top of the device with the power and data cable open to the back.
Touchless Sensing Technology
Dual ultrasonic sensors that accurately detects hand movement
Compact Design
Tight form factor with removable top and refillable container
Peristatic Pump
Reliable peristatic pump design to dispense the same amount of hand sanitizer every time
Optimized Injection Molding Design
Implementation of thread forming screws, screw bosses, snap-fits, alignment features, etc. to improve manufacturability and reduce part cost
Skills Developed:
Autodesk Fusion 360
Plastic Part Design
Multi-Material & Manufacturing Methods
BOM Creation
Product Design Features
Dimensional Tolerance Analysis
PCB Integration
Materials and Manufacturing Details
The outer enclosure is split into 2 parts: an upper and lower section. ABS was the material of choice for its good abrasion and impact resistance as well as high rigidity, taking into account its high traffic environment. The internal and external features were designed for injection molding and to reduce cost associated with complexity. A clear blow molded High Density Polyethylene (HDPE) container was used to hold the hand sanitizer due to its chemical resistance and low cost. The outer bracket for the peristatic pump is designed to be ABS injection molded while the internal metal rotor must be made out of a metal like stainless steel since it experiences high stress with each rotation. The design of the internal rotor was optimized for diecasting or CNC machining. Lastly, the tubing used to transport the viscous alcohol solution is made from clear PVC to provide the flexibility necessary to maneuver around the internal components.
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