DC Pulse Electromagnetic Coil for Liquid Metal Drop Ejection
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Solution Overview
Problem
Existing liquid metal jet printing technologies face challenges such as mechanical wear, complexity, and high maintenance costs due to the use of mechanical forces and alternating current in electromagnetic pumps, which limit the effectiveness and economic viability of three-dimensional metal printing.
Innovation Solution
A direct current pulse is applied to an electromagnetic coil to create a radial force, expelling a drop of liquid conductive material from a nozzle, reducing the need for moving parts and eliminating corrosion risks, while using fewer components and simpler power electronics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical force or alternating current electromagnetic pumps are used to propel liquid metal, then liquid metal drops can be produced, but the device complexity increases and maintenance costs rise due to mechanical wear and corrosion
Solution Approach 1:
The patent replaces mechanical pumping systems with a direct current electromagnetic coil system that uses electromagnetic forces to propel liquid metal drops. This substitution eliminates mechanical wear components while achieving the same drop-on-demand functionality, directly resolving the contradiction between reliability and device complexity
Solution Approach 2:
The patent changes the electrical parameter from alternating current to direct current in the electromagnetic coil system. This parameter change enables a simpler system architecture without moving parts, reducing device complexity while maintaining or improving reliability through elimination of wear-prone mechanical components
2Reliability
If alternating current electromagnetic pumps are used, then liquid metal can be pumped, but corrosion and arc formation increase due to electrode contact
Solution Approach 1:
The patent eliminates the need for solid electrodes by using a direct current electromagnetic coil to generate electromagnetic forces that propel the liquid metal. This substitution removes the source of corrosion and arc formation entirely, as there is no longer contact between electrodes and liquid metal, directly addressing the harmful factors while maintaining pumping functionality
3Ease of operation
If moving parts are used in electromagnetic pumps, then liquid metal propulsion is achieved, but wear and maintenance requirements increase
Solution Approach 1:
The patent extracts and removes all moving parts from the electromagnetic pump system, retaining only the stationary direct current coil and liquid metal reservoir. This extraction eliminates wear entirely since there are no moving components to degrade, directly improving ease of repair while maintaining the ability to propel liquid metal drops on demand
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 approach simplifies the construction of a drop-on-demand printer, reduces wear and maintenance costs, and enables the creation of three-dimensional metal objects with fewer parts, enhancing the economic viability and reliability of liquid metal jet printing.
Implementation Method 1
A direct current pulse is applied to an electromagnetic coil to create a radial force, expelling a drop of liquid conductive material from a nozzle
Data Source
AI summary
A printer that produces objects from liquid conductive material is disclosed. In one embodiment, the print head has a chamber for containing liquid conductive material surrounded by an electromagnetic coil. A DC pulse is applied to the electromagnetic coil, resulting in a radially-inward force on the liquid conductive material. The force on the liquid conductive material in the chamber results in a drop being expelled from an orifice. In response to a series of pulses, a series of drops fall onto a platform in a programmed pattern, resulting in the formation of an object.