Thermal Plug Valve for High-Temperature 3D Printer Flow Control

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional refractory ceramic valves used in 3D printers for controlling the flow of metallic build materials are not robust or reliable due to high temperatures, necessitating an improved system and method for temperature-controlled flow control.

Innovation Solution

A 3D printer system utilizing a valve with integrated heaters and coolers to transition the build material between solid and liquid states, allowing precise control through temperature adjustments without mechanical valves.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If conventional refractory ceramic valves are used to control flow at high temperature, then the valve can operate in the high temperature environment, but the valve is not robust or reliable

Engineering Contradiction:

Improveoperating temperatureVSAvoidvalve reliability

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent replaces the mechanical refractory ceramic valve with a thermal field-based flow control system. Instead of using mechanical components that physically open and close, the invention uses localized heating and cooling to control the phase state of the build material, thereby controlling flow without mechanical valves in the hot zone.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention utilizes phase transitions of the build material to control flow. By applying heat to melt the material and removing heat to solidify it, the system controls material flow through phase changes rather than mechanical means. The build material transitions between solid and liquid states to enable or prevent flow through the nozzle.

Inventive Principle:

Principle #36Phase transitions

2Device complexity

If plastic or refractory metal valves are used, then the valve structure is simpler, but they cannot withstand high temperatures

Engineering Contradiction:

Improvevalve structureVSAvoidwithstand temperature

Core Design Contradiction:

Device complexityVSTemperature

Solution Approach 1:

The patent eliminates the need for mechanical valves by substituting them with a thermal control system. The flow control function is achieved through thermal fields (heating and cooling zones) that control material phase, rather than through mechanical valve components that would need to withstand high temperatures.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention introduces thermal fields as an intermediary between the build material and the flow control mechanism. Instead of direct mechanical control at high temperature, thermal fields mediate the control process by adjusting material phase, allowing flow control without direct mechanical contact in the high-temperature zone.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If mechanical valves are replaced with thermal control, then valve reliability improves, but energy consumption increases due to heating and cooling

Engineering Contradiction:

Improveflow control reliabilityVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The system recovers and reuses thermal energy in the flow control process. The cooling zone that solidifies material for flow control can transfer its cold thermal energy to pre-cool incoming build material, reducing the heating energy required later. This thermal energy recovery reduces overall energy consumption while maintaining reliable flow control.

Inventive Principle:

Principle #34Discarding and recovering

Solution Approach 2:

The heating and cooling zones operate in periodic cycles to control material flow. By alternating between heating (to melt and enable flow) and cooling (to solidify and stop flow), the system achieves reliable flow control with intermittent energy input rather than continuous high energy consumption, improving energy efficiency.

Inventive Principle:

Principle #19Periodic action

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

Enables reliable and efficient flow control of metallic materials by rapidly cooling and heating the build material to prevent or allow flow, enhancing the reliability and consistency of 3D printing processes.

Implementation Method 1

A valve is disclosed that includes a cooler configured to cool the build material to below a melting point of the build material to form a solid plug

Methodology Applied

Scientific EffectPhase change (liquid to solid): Phase Change

Implementation Method 2

The valve also includes a heater configured to re-heat the build material to above the melting point to allow the build material to flow therethrough

Methodology Applied

Scientific EffectPhase change (solid to liquid): Phase Change

Data Source

PatentUS12569914B2System and method for controlling flow through a 3D printer

Publication Date: 2026.03.10 ADDITIVE TECH LLC DBA ADDITEC

AI summary

A valve configured to control flow of a material therethrough includes a body having a bore formed axially therethrough. The valve also includes a cooler positioned at least partially around or within the body. The cooler is configured to cool the material to below a melting point of the material to form a solid plug within the body to prevent the material from flowing therethrough. The valve also includes a heater positioned at least partially around or within the body. The heater is configured to re-heat the material to above the melting point of the material to allow the material to flow therethrough.