Foamer Dispenser Airway Structure to Prevent Backflow
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Solution Overview
Problem
Foamer dispensers face issues with backflow of the content medium into the air cylinder, leading to a decrease in air supply and deterioration of foam quality over repeated use.
Innovation Solution
A foamer dispenser design featuring a hollow stem with a flange and tubular guide that prevents backflow by creating a first airway, coupled with a jet ring having a middle tubular portion with an inward dented outer wall to reduce resin usage and simplify the shape, ensuring stable and efficient foam dispensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional foamer dispenser structure is used, then the dispenser can function initially, but upon repeated dispensing the content medium flows backward into the air cylinder causing deterioration in foam quality
Solution Approach 1:
The airway is segmented into two separate pathways: a first airway for air supply and a second airway for content medium flow. This segmentation prevents the content medium from entering the air cylinder by directing it through a dedicated second airway that bypasses the first airway, thereby eliminating backflow and maintaining consistent foam quality over repeated dispensing operations.
2Ease of manufacture
If the jet ring is designed with traditional structure, then assembly is straightforward, but resin usage is excessive and shape is complex
Solution Approach 1:
The unnecessary middle tubular portion is extracted from the jet ring structure. By removing this redundant component and simplifying the shape to eliminate complex features, the design reduces resin usage while maintaining adequate assembly simplicity through the streamlined configuration.
3Quantity of substance
If the content medium dosage per actuation is increased, then more content is dispensed, but operability and stability may be compromised
Solution Approach 1:
The segmented airway structure enables increased content medium dosage per actuation by providing a dedicated second airway that prevents backflow. This segmentation ensures that even with larger dosage, the air supply remains uncontaminated and the mixing ratio is maintained, thereby preserving operability and stability while achieving higher content delivery.
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 design effectively prevents backflow, maintaining foam quality and allowing for increased content medium dosage per actuation without compromising operability or stability, while minimizing resin usage and simplifying the jet ring's shape.
Implementation Method 1
a hollow piston disposed in abutment with an inner circumferential surface of the small-diameter tubular body and configured to slide toward the bottom portion of the small-diameter tubular body to pressurize and pump the content medium
Implementation Method 2
an air piston disposed in abutment with an inner circumferential surface of the large-diameter tubular body and configured to slide toward the bottom portion of the large-diameter tubular body to pressurize and pump the air
Implementation Method 3
to foam the mixture of the content medium and the air by a foaming member disposed inside the nozzle head
Data Source
AI summary
A foamer dispenser includes a hollow stem, an air piston configured to pressurize and pump air, and a tubular guide that is coupled integrally to the air piston, that defines an airway for air supply between the hollow stem and the tubular guide, that holds the hollow stem slidably, and that is configured to come out of abutment with the flange in response to sliding of the hollow stem, thereby opening the airway is provided. The flange is provided with: an outer annular wall protruding upward from an outer edge of the flange; and a guide rib located on an outer side of the tubular guide in the radial direction and configured to be guided by the tubular guide during sliding of the hollow stem.