FFF Nozzle Manifold With Integral Double-Helix Cooling
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Solution Overview
Problem
Existing fused filament fabrication (FFF) systems face challenges in effectively cooling nozzles, particularly when processing high-temperature polymers like PEEK, PAI, and SRP, as prior methods struggle to provide reliable and controlled thermal management to prevent filament clogging and ensure consistent deposition.
Innovation Solution
An integral cooling system within the FFF nozzle manifold is introduced, featuring a coolant channel with a double-helix design that maximizes thermal coupling and surface area, allowing for efficient heat transfer and maintaining a sharp thermal gradient between the solid and liquid phases of the filament.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a fan or circulating cooling liquid is used to cool the cooling block, then the temperature control capability is improved, but the device complexity and reliability are worsened due to additional components and potential failure points
Solution Approach 1:
The patent merges the cooling function directly into the nozzle manifold by integrating coolant channels within the manifold structure itself. This eliminates the need for separate cooling blocks and fans, reducing device complexity while maintaining effective temperature control of the nozzle assembly.
Solution Approach 2:
The patent introduces a coolant as an intermediary substance to transfer thermal energy from the nozzle manifold. The coolant channels serve as intermediary pathways that enable efficient heat removal without requiring direct mechanical cooling components attached to the nozzle.
2Device complexity
If the cooling block is positioned away from the nozzle, then the device complexity is reduced, but the thermal management effectiveness is worsened due to increased thermal gradient and heat accumulation
Solution Approach 1:
The cooling channels are merged directly into the nozzle manifold structure, positioning the cooling function at the exact location where thermal management is most critical. This integration ensures immediate heat removal from the nozzle, preventing filament clogging while maintaining a simple unified structure.
Solution Approach 2:
The patent applies cooling channels specifically at the nozzle manifold location where thermal management is most needed, rather than using a generic remote cooling block. This localized cooling approach provides targeted thermal control exactly where the phase change and potential clogging occur.
3Device complexity
If the coolant channel is positioned far from the filament channel, then the thermal gradient control is simplified, but the thermal coupling efficiency is worsened due to reduced heat transfer effectiveness
Solution Approach 1:
The coolant channels are positioned in immediate proximity to the filament channel within the nozzle manifold, creating localized thermal coupling. This ensures maximum heat transfer efficiency from the molten filament to the coolant, effectively removing thermal energy where it is generated.
Solution Approach 2:
The patent utilizes the three-dimensional space within the nozzle manifold to position coolant channels in close proximity to the filament path. By exploiting the vertical and radial dimensions within the manifold structure, the design achieves intimate thermal coupling without increasing horizontal footprint or overall device complexity.
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 enhances the consistent and controlled operation of FFF systems by effectively managing thermal energy, reducing filament clogging, and ensuring precise temperature control during the deposition of high-temperature polymers, thereby improving the reliability and efficiency of the 3D printing process.
Implementation Method 1
The coolant channel is thermally coupled to both via the body of the nozzle manifold
Implementation Method 2
The interior of the cooling channel is constructed so as to maximize the available surface area within a given cross-sectional geometry, thereby promoting increase heat transfer between the nozzle manifold and the cooling liquid
Data Source
AI summary
The present invention provides an integral cooling system within an FFF nozzle manifold. The system includes a cooling reservoir formed within the body of the nozzle manifold, adapted to circulate a cooling liquid around the filament chamber and nozzle orifice. The coolant channel is situated to be in close physical proximity to the chamber and orifice, and to be thermally coupled to both via the body of the nozzle manifold. In addition, the interior of the cooling chamber is constructed so as to maximize the available surface area within a given cross-sectional geometry, thereby promoting increase heat transfer between the nozzle manifold and the cooling liquid.