Vented Refill Unit With One-Way Valve for Leak-Free Re-Priming
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Solution Overview
Problem
Existing liquid dispenser systems with venting systems often leak when inverted or exposed to liquid intermittently, and over-tightening can cause leaks, preventing proper venting.
Innovation Solution
A vented refill unit design featuring a non-collapsing container with a pump and venting insert that includes a one-way air inlet valve, allowing air to enter the container when vacuum pressure exceeds a certain threshold, preventing liquid from leaking and ensuring proper venting without leakage issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a venting system is added to allow air to enter the container, then the pump can re-prime itself after dispensing, but the system leaks when inverted or exposed to liquid
Solution Approach 1:
The venting function is segmented from the main pump assembly into a separate venting insert with a dedicated one-way valve mechanism. This allows the venting system to operate independently without interfering with the pump's liquid handling, enabling reliable re-priming while preventing liquid leakage through the venting path.
Solution Approach 2:
A one-way valve acts as an intermediary element between the container interior and the external environment. This valve mediates air flow in only one direction (into the container), allowing the pump to re-prime by admitting air while simultaneously blocking liquid from escaping through the same passage when the container is inverted or overfilled.
2Strength
If the pump is over-tightened to secure it to the container, then the connection is stronger, but the container leaks or venting passages are sealed
Solution Approach 1:
The attachment function is segmented from the venting function by using a separate venting insert that attaches to the pump housing rather than integrating the venting passage directly into the pump mounting structure. This allows the pump to be securely tightened to the container without compromising the venting passages, as the venting insert provides a dedicated, protected pathway that is independent of the mechanical connection force.
3Ease of manufacture
If a simple venting system is used to reduce cost, then manufacturing is cheaper, but the system leaks when inverted
Solution Approach 1:
A one-way valve serves as an intermediary component that can be integrated into an otherwise simple and inexpensive venting system. This valve is a cost-effective solution that prevents liquid leakage when the container is inverted while still allowing air to enter for pump re-priming, maintaining manufacturing simplicity without sacrificing reliability.
Solution Approach 2:
The venting system utilizes pressure differential as a controlling parameter. The one-way valve responds to pressure changes caused by pump operation and container orientation, automatically opening to allow air in during normal operation and closing to prevent leakage when inverted, thereby achieving reliable performance in a simple, low-cost design.
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 solution provides a leak-proof and re-primeable dispenser system that remains functional when inverted and is inexpensive to produce, ensuring efficient air venting and easy recharging of liquid dispensers.
Implementation Method 1
the one-way air inlet valve opens when the vacuum pressure in the container exceeds the cracking pressure of the one-way air inlet valve to allow air to vent the container
Implementation Method 2
A one-way air inlet valve is located proximate the one or more apertures and the one-way air inlet valve opens when the vacuum pressure in the container exceeds the cracking pressure
Data Source
AI summary
Exemplary embodiments of vented refill units and dispensers having vented refill units are disclosed herein. An exemplary refill unit includes a non-collapsing inverted container. The container has a neck located at the bottom of the container. A pump is secured to the neck. The pump has a housing that has a cylindrical outside surface. In addition, the housing has an attachment mechanism for attaching the pump to a venting insert. The venting insert has a cylindrical inside surface and a cylindrical outside surface. At least a portion of the venting insert is located within the neck. An air passage is located between the pump housing and the cylindrical inside surface of the venting insert. One or more apertures are located through the venting insert. A one-way air inlet valve is located proximate the one or more apertures.