Coating Liquid Mixing Nozzle with Reduced Diameter for Clogging Prevention
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Solution Overview
Problem
Static mixers used in coating liquid applications often suffer from clogging issues due to the materials within the liquids, leading to cumbersome cleaning and low maintainability.
Innovation Solution
A coating liquid mixing device and method featuring a supply tube with distally open flow paths and a mixing nozzle with a reduced diameter portion, where the interior space narrows towards the outlet, guiding coating liquids to mix while increasing flow velocity and preventing clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a static mixer with a baffle for agitation is used, then mixing of coating liquids is achieved, but the baffle is likely to be clogged with materials contained in coating liquids, making the device cumbersome to clean and reducing maintainability
Solution Approach 1:
The invention removes the baffle component from the mixing device. Instead of using a static mixer with agitation baffles that are prone to clogging, the patent employs a passive mixing nozzle where mixing occurs through the geometric configuration of the flow paths and the Coanda effect, eliminating the part that causes maintenance problems
Solution Approach 2:
The invention replaces the mechanical agitation system (baffles) with a fluid dynamic system based on the Coanda effect. The coating liquid flows along the wall surface of the mixing nozzle, creating a vortex flow that achieves mixing without mechanical contact points that could clog
2Productivity
If the open area of the mixing nozzle is made smaller than the total open area of the flow paths, then coating liquids are guided to mix together while increasing in flow velocity, but this requires precise control of the reduced diameter portion geometry
Solution Approach 1:
The invention optimizes the geometric parameters of the mixing nozzle, specifically the reduced diameter portion, to achieve the desired flow velocity increase and mixing efficiency. By carefully controlling the taper angle and length of the reduced diameter section, the device achieves effective mixing while maintaining manufacturability
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 effectively prevents clogging and enhances maintainability by ensuring the coating liquids are mixed efficiently without minimum flow velocity regions, reducing the effort and resources required for cleaning.
Implementation Method 1
a mixing nozzle communicating with an outlet of the supply tube so that the coating liquids flowing through the flow paths are supplied to an interior space, and including a reduced diameter portion in which the interior space is reduced toward an outlet
Implementation Method 2
including a reduced diameter portion in which the interior space is reduced toward an outlet so that an open area of the mixing nozzle is smaller than a total open area of the flow paths
Data Source
AI summary
A coating liquid mixing device includes a supply tube including flow paths through which respective coating liquids flow and which are distally open; and a mixing nozzle communicating with an outlet of the supply tube so that the coating liquids flowing through the flow paths are supplied to an interior space, and including a reduced diameter portion in which the interior space is reduced toward an outlet so that an open area of the mixing nozzle is smaller than a total open area of the flow paths.