Bifurcated Foam Pump for Low-Cost Refillable Dispensers
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Solution Overview
Problem
Foam generating pumps are more expensive than liquid dispensing pumps, leading to increased costs for disposable cartridges due to the need for both liquid and air compressor components, where only the liquid pumping and foam generating portion needs replacement.
Innovation Solution
A bifurcated foam pump design where the liquid pump is part of the disposable refill cartridge and the air compressor is a non-disposable, fixed part of the dispenser housing, allowing the liquid pump to be replaced independently of the air compressor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complete foam generating pump is included in the disposable cartridge, then foam generation capability is ensured, but the cost of disposable cartridges increases
Solution Approach 1:
The pump is divided into two separate components: the liquid pump portion is integrated into the disposable cartridge while the air compressor portion is mounted on the reusable dispenser housing. This segmentation allows the expensive air compressor to be reused across multiple cartridges, reducing overall system cost while maintaining complete foam generation capability in each cartridge.
Solution Approach 2:
The air compressor portion is designed as a universal component that can work with multiple different liquid pump cartridges. This multi-functionality allows a single air compressor unit to serve indefinitely, only requiring replacement of the liquid pump portion when the liquid is depleted, thereby reducing the frequency of expensive component replacements.
2Ease of operation
If both liquid pump and air compressor are made disposable, then replacement is simple, but waste increases and cost increases
Solution Approach 1:
The design allows discarding only the liquid pump portion (containing the depleted liquid) while recovering and retaining the air compressor portion for continued use. This selective discarding minimizes waste of functional components while maintaining operational simplicity, as the reusable air compressor is easily retained on the dispenser housing.
Solution Approach 2:
The air compressor portion is extracted from the disposable cartridge design and placed on the permanent dispenser housing. This extraction separates the reusable component from the disposable component, allowing the air compressor to be taken out of the waste stream and reused indefinitely while the liquid pump portion remains disposable for simplicity.
3Ease of manufacture
If a complete foam pump is made reusable, then cost decreases, but the liquid pump portion cannot be replaced independently
Solution Approach 1:
The pump system is segmented into modular components with standardized interfaces. The liquid pump portion can be independently replaced by detaching it from the dispenser housing while leaving the air compressor portion in place. This segmentation provides both cost efficiency through reusability and adaptability through independent replacement capability.
Solution Approach 2:
The connection between the liquid pump portion and air compressor portion is designed to be dynamically changeable - easily connectable and disconnectable. This dynamic interface allows the liquid pump to be replaced independently when needed while maintaining the permanent, reusable air compressor component, balancing both cost efficiency and operational flexibility.
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
This design reduces the cost of disposable cartridges by allowing only the liquid pump to be replaced, while the air compressor remains functional through multiple refills, thus lowering overall dispensing costs and maintaining reliable foam generation.
Implementation Method 1
an air compressor portion adapted to remain a permanent part of the dispenser housing... an air inlet passage in fluid communication with the atmosphere prior to being installed in a foam dispenser and in fluid communication with the air compressor when the refill unit is placed in the foam dispenser
Data Source
AI summary
Embodiments of foam dispensers including a housing, an air compressor connected to the housing and an actuator for actuating the air compressor are disclosed herein. The air compressor releasably mates with a refill unit. The dispenser has an “empty state” and a “refilled state.” The empty state occurs when there is not a refill unit positioned in the dispenser, and the refilled state occurs when the refill unit is positioned in the dispenser. The air compressor remains connected to the housing during the refilled state and remains connected to the housing during the empty state. One refill unit for a foam pump dispenser includes a container for containing a foamable liquid and liquid pump housing connected to the container. The liquid pump housing is configured to releasably mate with an air compressor that is not part of the refill unit but is secured to a foam pump dispenser housing, and the refill unit is configured to be removed from the foam dispenser without removing the air compressor from the foam dispenser. The air inlet passage is in fluid communication with the atmosphere prior to being installed in a foam dispenser and the air inlet passage is in fluid communication with an air compressor when the refill unit is placed in the foam dispenser.