Refill Dispenser Reservoir Venting to Prevent Air Lock
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Solution Overview
Problem
Conventional soap and sanitizer dispensers use disposable refill cartridges that cannot be refilled, leading to waste and the risk of users attempting to use empty dispensers, as maintenance staff struggle to determine when to replace them to avoid either running out of fluid or wasting remaining liquid.
Innovation Solution
A dispensing system with a non-collapsing refill container that can be removed and replaced when empty, featuring a reservoir and pump configuration that allows fluid transfer and air exchange between the refill container and the reservoir, preventing air lock and ensuring continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If disposable refill cartridges are used, then the dispenser can be simple and easy to manufacture, but the refills cannot be refilled leading to waste and inability to determine when to replace
Solution Approach 1:
The dispenser is divided into separate functional components: a reusable pump housing and replaceable refill containers. This segmentation allows the refill containers to be independently replaced when empty, eliminating fluid waste while keeping the expensive pump mechanism reusable, thus resolving the contradiction between reducing substance loss and maintaining device simplicity
Solution Approach 2:
The system enables recovery and reuse of the pump mechanism while discarding only the empty refill containers. The pump housing can be refilled multiple times by replacing refill containers, transforming a disposable system into a reusable one, thereby reducing fluid waste without significantly increasing overall system complexity
2Reliability
If disposable refill cartridges are used, then the dispenser structure is simple, but maintenance staff cannot determine when to replace refills avoiding running out or wasting liquid
Solution Approach 1:
The refill containers incorporate visual indicators (such as color changes or transparent sections) that allow maintenance staff to easily determine when refills are empty or need replacement. This visual feedback mechanism ensures continuous operation by preventing both running out of fluid and unnecessary replacement, without requiring complex electronic monitoring systems
Solution Approach 2:
The system provides visual feedback through the refill container design, enabling maintenance staff to monitor fluid levels and determine optimal replacement timing. This feedback mechanism ensures reliable continuous operation by preventing both empty dispenser scenarios and premature replacement that would waste remaining liquid
3Reliability
If a non-collapsing refill container is used with fluid transfer mechanism, then refill containers can be removed when empty preventing user access to empty dispensers, but the system complexity increases
Solution Approach 1:
The pump mechanism serves dual functions: it both dispenses fluid to users and automatically transfers fluid from refill containers to the reservoir. This merging of functions eliminates the need for separate complex fluid transfer mechanisms while ensuring that the dispenser reservoir remains filled, preventing empty dispenser scenarios without proportionally increasing system complexity
4Ease of manufacture
If disposable refill cartridges are used, then manufacturing is easy, but there is risk of users attempting to use empty dispensers
Solution Approach 1:
Visual indicators on the refill containers provide clear signals to users about refill status, preventing attempts to use empty dispensers. The simple visual feedback mechanism maintains ease of manufacture while significantly improving user experience and reliability
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
Enables the removal of refill containers when empty while maintaining fluid in the reservoir, preventing user access to empty dispensers and minimizing fluid waste, while also allowing for easy replacement and maintenance of the reservoir and pump.
Implementation Method 1
Operation of the pump causes liquid to move from the refill container to the reservoir through the liquid passage
Implementation Method 2
causes air to move from the reservoir to the refill container through the air passage if there is air in the reservoir
Data Source
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AI summary
A dispensing system, comprising: a housing; a reservoir secured to the housing; a cavity located in an upper portion of the reservoir, wherein the cavity is configured so that air in the reservoir migrates to the cavity; an air passage extending upward from the cavity; a liquid passage extending upward from the reservoir; a bottom of the liquid passage being located below a bottom of the air passage; at least one engagement member, wherein the engagement member is configured to mate with a refill container; a pump having a pump chamber in fluid communication with the reservoir; an outlet nozzle in fluid communication with the pump chamber; and a refill container configured to be releasably attached to the reservoir such that the refill container is in fluid communication with the reservoir through the at least one engagement member; the refill container having at least one sealing member