Modular Mixing Assembly for Reactive Chemical Dispensing
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Solution Overview
Problem
Current mixing and dispensing devices for reactive chemical streams, such as polyurethane foam compositions, lack flexibility to custom blend multiple components and adjust formulations during the dispensing process, particularly when handling incomplete pre-blend formulas that require the addition of blowing agents, which poses challenges in achieving custom individualized results and adapting to varying foam applications.
Innovation Solution
A modular mixing assembly integrated with a dispensing cartridge, featuring primary and secondary central bodies, modular valve blocks, and a modular tip adapter, allowing for the channeling of multiple fluid sources and enabling the mixing and dispensing of reactive chemical compositions with adjustable flow control and optional static mixing, facilitating the incorporation of additives and blowing agents as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed configuration mixing device is used, then the device structure is simple, but the device cannot adapt to different foam formulations and applications
Solution Approach 1:
The mixing device is divided into separate modular components including a dispensing cartridge with tip adapter, a static mixer section, and a valve assembly. Each component can be independently selected or replaced to match different formulation requirements, enabling adaptability without requiring complete device redesign.
Solution Approach 2:
The dispensing cartridge is designed with a universal tip adapter that can accommodate multiple tip configurations and orientations. The modular architecture allows the same basic device to perform multiple functions by simply changing cartridges or tip adapters, rather than requiring separate devices for each application.
2Adaptability or versatility
If multiple components are manually mixed outside the dispensing device, then custom formulations can be achieved, but the process requires significant equipment investment and engineering time
Solution Approach 1:
The dispensing device incorporates an intermediary mixing chamber and static mixer section that serves as a bridge between the separate chemical components and the final foam product. This integrated mixing system eliminates the need for external mixing equipment by providing all necessary mixing functions within the dispensing cartridge itself.
Solution Approach 2:
The device enables end-users to perform custom blending themselves without requiring external mixing equipment or specialized engineering knowledge. The self-contained cartridge system with integrated static mixer allows users to simply load components and activate dispensing, with the device automatically handling all mixing operations.
3Ease of operation
If a removable valve cartridge is used, then the cartridge can be disposed when fouled, but the device lacks flexibility to adjust formulations during dispensing
Solution Approach 1:
The valve assembly is designed to accept different cartridge configurations that can be changed during the dispensing process. The dynamic capability to swap cartridges without replacing the entire device allows formulation adjustments while maintaining the ease of cartridge replacement benefit.
Solution Approach 2:
The tip adapter is designed to nest within the dispensing cartridge, creating a layered modular structure. This nested configuration allows the tip adapter to be independently replaced or adjusted while keeping the main cartridge in place, providing formulation flexibility without requiring complete cartridge replacement.
4Ease of manufacture
If prior complete pre-blend systems are used, then the mixing process is simple, but the devices cannot handle incomplete pre-blend formulas requiring additive mixing
Solution Approach 1:
The static mixer is pre-configured within the dispensing cartridge to automatically perform the necessary mixing operations as components flow through. This preliminary mixing action is built into the device structure, eliminating the need for external mixing equipment while maintaining process simplicity.
Solution Approach 2:
The device utilizes fluid dynamics and pressure differentials to drive the reactive chemical streams through the mixing chamber and static mixer. This hydraulic approach enables automatic mixing of incomplete formulas without requiring mechanical mixers or complex control systems, maintaining simplicity while handling versatile formulations.
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
This solution provides a flexible and efficient means to custom blend reactive chemical streams, enabling precise control over the mixing and dispensing process, allowing for adjustments during application, and effectively handling various foam formulations by accommodating different additive packages and blowing agents, thus enhancing the ability to achieve specific foam properties and fill voids accurately.
Implementation Method 1
These two materials are highly reactive and readily react at various temperatures to form a foam material
Implementation Method 2
Upon mixture, the reaction commences and a voluminous foam is formed as the reaction products and/or optional blowing agents build volume within the reactive foam structure
Data Source
AI summary
A modular dispensing device for mixing and dispensing reactive components includes a body, a triggering device, a dispensing cartridge, a control device, and a modular mixing assembly. The modular mixing assembly includes a primary central body shaped to accept the dispensing cartridge, the primary central body having a pair of opposed primary central body passages, two modular valve blocks to channel flow of a fluid from external sources to one of the primary central body passages, a secondary central body assembly attached to a downstream end of the primary central body, and a modular tip adapter mounted to the secondary central body and surrounding a tip of the dispensing cartridge and having an adapter passage for the flow of fluid to mix with fluid exiting the dispensing cartridge tip.