Spool Valve Gas Channel for Foam Dispenser Leakage
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Solution Overview
Problem
Existing foam dispensers are inadequate for handling both high and low viscosity foam components, often leading to mechanical failure, leakage, and clogging issues due to loose tolerances and material limitations, particularly when dealing with high-pressure components.
Innovation Solution
A metal housing with improved spool valve design and gas channel functionality allows for higher pressure mixing, reduces leakage, and facilitates automatic clearing of residual liquids, enabling efficient and accurate delivery of foam components to a mixing chamber, and easy re-use of the dispenser.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a plastic dispenser with small channels is used for low pressure mixing, then the device is lightweight and easy to manufacture, but it cannot handle high viscosity components and has loose tolerances leading to leakage
Solution Approach 1:
The dispenser combines metal components (housing, spool valve, channels) with plastic components (handle, trigger assembly). The metal parts provide the necessary strength, precision, and tolerance for high-pressure operation and high viscosity materials, while the plastic parts maintain lightweight construction and ease of manufacture for non-critical components.
2Reliability
If a metal housing with improved spool valve design is used, then the durability and precision are improved, but the device complexity increases
Solution Approach 1:
The spool valve is designed as a separate, removable component that can be independently cleaned and maintained. The mixing chamber is also separable from the housing, allowing residual components to be easily removed. This segmentation simplifies maintenance procedures despite the increased initial manufacturing complexity of the metal components.
3Adaptability or versatility
If high pressure impingement is used for mixing, then higher viscosity ingredients can be used, but the risk of mechanical failure and clogging increases
Solution Approach 1:
The spool valve channels are precisely machined with controlled dimensions and smooth surfaces to optimize fluid flow characteristics. The channel geometry is specifically designed to prevent turbulence and dead zones where residual components could accumulate and cause clogging, allowing high pressure operation with high viscosity materials while maintaining reliability.
4Reliability
If residual components accumulate in the mixing chamber, then clogging occurs, but frequent disassembly for cleaning increases maintenance time
Solution Approach 1:
The mixing chamber is designed as a separable component that can be easily detached from the housing. This allows rapid removal and cleaning of the mixing chamber without disassembling the entire dispenser, significantly reducing maintenance time while preventing clogging from residual component accumulation.
Data Source
AI summary
A foam dispenser having a metal housing has a spool valve socket therein. A metal handle extends from the housing. A spool valve is disposable within the spool valve socket. A trigger couplable to the spool valve enables the spool valve to be rotated between open and closed orientations within the housing. The spool valve has internal channels for selectively passing liquids through the spool valve in the open orientation and not in the closed orientation. The spool valve also has a channel for selectively passing a gas through the spool valve in both the open and closed orientations.