Gravity-fed Liquid Delivery System for 3D Printing
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Solution Overview
Problem
Existing additive manufacturing systems for three-dimensional inkjet printing face challenges in efficiently delivering building materials to the printing head, often requiring complex pump systems that increase manufacturing costs and system complexity.
Innovation Solution
A system comprising a cartridge with a valve and a vented sub-tank with inlet ports at different heights, allowing liquid material to flow by gravity and eliminating the need for electronic pumps, thereby simplifying the system and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pump systems are used to deliver building material to the printing head, then the material delivery reliability is improved, but the system complexity and manufacturing cost increase
Solution Approach 1:
The patent removes the pump system from the material delivery mechanism, extracting the complex active pumping component while maintaining material delivery functionality through passive gravity-driven flow and capillary action in the wick structure.
Solution Approach 2:
The system uses the building material's own weight (gravity) and the wick's capillary properties to drive material flow to the printing head, eliminating the need for external pump power and control systems.
2Productivity
If pump systems are used to deliver building material, then material flow control is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs inexpensive passive components (wick material, gravity-driven flow path) instead of expensive pump systems, accepting that the wick may need periodic replacement while significantly reducing overall system cost.
Solution Approach 2:
The patent replaces the mechanical pump system with a passive gravity-driven flow system combined with capillary action in the wick, eliminating motors, sensors, and control electronics while maintaining material delivery capability.
3Manufacturing precision
If complex pump systems are used, then material delivery precision is improved, but system simplicity is reduced
Solution Approach 1:
The wick structure serves as an intermediary component that passively regulates material flow to the printing head through capillary action, providing precise material delivery without requiring complex pump control systems.
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 system effectively delivers liquid material to the nozzle array without the need for pumps, simplifying the printing system, reducing manufacturing costs, and enhancing the reliability of the additive manufacturing process.
Implementation Method 1
The sub-tank has a sub-tank inlet configured to receive the cartridge outlet to allow the liquid material to flow through the cartridge outlet by gravity
Data Source
AI summary
A system for delivering liquid material to a nozzle array of a printing system comprises a cartridge and a vented sub-tank. The cartridge has a cartridge outlet and contains the liquid material. The sub-tank has a sub-tank inlet configured to receive the cartridge outlet to allow the liquid material to flow through the cartridge outlet by gravity, two inlet ports within the sub-tank inlet at different heights relative to a liquid level in the sub-tank, and a sub-tank outlet. The sub-tank outlet is sealingly connectable to the nozzle array by a pipe and has an outlet port below the inlet ports.