Additive Manufacturing Filter Modules With Inert-Gas Passivation
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Solution Overview
Problem
Existing additive manufacturing systems face challenges in continuously filtering and passivating contaminants without interrupting the build process, as filters become contaminated and require manual replacement, posing risks of ignition due to exposure to atmospheric oxygen.
Innovation Solution
A dual-filter module system that allows continuous operation by alternating between cleaning and passivating processes, using a rotating nozzle to dislodge particulates and inert gas to safely manage contaminants within the filter modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filters are manually removed and replaced, then filter contamination is addressed, but the build process must be suspended and ignition risk increases
Solution Approach 1:
The filter system is divided into multiple independent filter units (first filter unit, second filter unit) that can operate independently. When one filter unit needs cleaning or replacement, the other continues to filter, maintaining build process continuity without suspension
Solution Approach 2:
The filter housing maintains an inert atmosphere environment where filter units are cleaned and passivated. The passivation process introduces oxygen in a controlled manner to safely oxidize flammable contaminants on filter units without causing ignition, addressing reliability while preventing safety hazards
2Ease of repair
If filter units are removed for cleaning, then filter maintenance is achieved, but protective measures and safety complexity increase
Solution Approach 1:
The filter housing serves as an intermediary controlled environment between the external atmosphere and the filter units. It provides a safe workspace with inert atmosphere for filter maintenance operations, eliminating the need for complex external protective measures while maintaining safety
Solution Approach 2:
The system enables self-contained filter maintenance within the filter housing. The inert atmosphere and passivation system allow filter units to be cleaned and passivated in-place without requiring external protective equipment or complex safety infrastructure
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 continuous filtering and passivation of contaminants without stopping the additive manufacturing process, ensuring safe handling and reuse of materials while maintaining a clean inert environment.
Implementation Method 1
a cleaning gas is introduced into the rotatable nozzle to generate a cleaning gas pressure surge
Implementation Method 2
The even distribution of the plurality of nozzle arm outlets, along with the rotational motion of the rotatable nozzle, ensures an even dispersal of the cleaning gas pressure surge
Implementation Method 3
a primary filter mounted within an interior of the filter housing
Implementation Method 4
The materials used for passivation often require the addition of special components to handle these materials
Data Source
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AI summary
Disclosed herein are filter (193a) devices for additive manufacturing apparatuses that include a filter device inlet (112) that receives a process medium from an additive manufacturing apparatus, at least one filter module (102a) that separates particulates (186) and inert gas from the process medium, the at least one filter module (102a) including a filter housing (104) with a filter housing inlet (114) that is fluidly connected to the filter device inlet (112) to receive the process medium, a primary filter (156) mounted within an interior of the filter housing (104), a rotational nozzle (170) mounted to the filter housing (104) and at least partially positioned within the primary filter (156), a removable container (120) fluidly connected to the filter housing (104), and a passivation system fluidly connected to both the filter housing (104) and the removable container (120), and a filter device inert gas outlet (116) that discharges the inert gas.