Static Mixing Nozzle Backflow Prevention Segmentation
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Solution Overview
Problem
Existing two-component dispensing systems face challenges in preventing backflow of the mixture into the outlets of the dispensing gun, which can lead to clogging and inefficiency, and often require moving parts or complex constructions to address this issue.
Innovation Solution
A static mixing nozzle with a series of static backflow prevention elements, such as walls and orifices, is used to divide the chambers into compartments, creating a zig-zag flow path that inhibits backflow, allowing the mixture to flow through multiple compartments before reaching the outlets, thus preventing backflow without the need for moving parts and simplifying the construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If moving parts or complex constructions are used to prevent backflow, then backflow prevention reliability is improved, but device complexity increases
Solution Approach 1:
The mixing nozzle is divided into multiple compartments (first compartment, second compartment, third compartment) separated by partition walls. This segmentation creates a multi-chamber structure that prevents backflow through geometric design rather than moving parts, resolving the contradiction between reliability and complexity.
Solution Approach 2:
Instead of using active moving parts to prevent backflow, the invention uses passive geometric features (partition walls and flow direction control) to achieve the same effect. The flow path is designed to naturally prevent backflow through the compartment structure, inverting the traditional approach of using active mechanisms.
2Device complexity
If static backflow prevention elements are used, then device complexity is reduced, but backflow prevention effectiveness may worsen
Solution Approach 1:
The compartmentalized structure with partition walls creates multiple flow path segments. The first compartment receives component A, the second compartment receives component B, and the third compartment mixes them. This segmentation ensures that backflow is prevented while maintaining simplicity, as the geometric design inherently controls flow direction without complex mechanisms.
Solution Approach 2:
The partition walls act as intermediaries between the different component chambers and the mixing chamber. These static structures mediate the flow of components, ensuring proper mixing while preventing backflow into the dispensing gun outlets, thus maintaining both simplicity and effectiveness.
Data Source
AI summary
Dispensing system for dispensing a mixture of a first component and a second component, the dispensing system comprising: (i) a dispensing gun comprising an inlet body with a first passage for feeding in the first component under pressure and a second passage for feeding in the second component under pressure, the first and second passages respectively comprising a closable first outlet and a closable second outlet, which may be operable by means of a handle or trigger of the dispensing gun; (ii) a static mixing nozzle, detachably connectable to the outlets of the body and provided for mixing and dispensing the components, the static mixing nozzle comprising a first section containing a first chamber and a second chamber for conducting the first and second component respectively and a second section, subsequent to the first section (in forwards flow direction), containing a mixing chamber with static mixing elements which promote mixing the first and second components and conducting the mixture to a nozzle tip serving as an outlet for the mixture. According to the invention, at least one of the first and second chambers of the static mixing nozzle contains a series of static backflow prevention elements, arranged for hindering backflow of the respective component within the respective chamber.