Powder Capturing Device for Vacuum Pump Protection in PBF-AM
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Solution Overview
Problem
In three-dimensional powder bed fusion additive manufacturing (PBF-AM) apparatus, the smoke phenomenon causes metal powder to be scattered and potentially sucked into the vacuum pump, leading to adverse effects on the pump's operation and reduced exhaust efficiency due to the presence of filters intended to prevent powder intrusion.
Innovation Solution
A powder capturing device with multiple flow path forming units, including first and second catching units, is placed on the intake side of the vacuum pump to collide and capture the scattered powder, maintaining continuous gas flow and preventing powder intrusion without hindering exhaust efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mesh-like or fibrous filter is disposed on the intake side of the vacuum pump to prevent powder intrusion, then powder protection is improved, but gas flow is hindered and exhaust efficiency is significantly reduced
Solution Approach 1:
The patent introduces a powder capturing device as an intermediary component between the vacuum chamber and the vacuum pump. This device includes a plurality of flow path forming units with catching units that intercept powder particles before they reach the pump, while maintaining open gas flow paths. The catching units act as mediators that selectively capture powder without blocking the overall gas flow, thus protecting the pump while preserving exhaust efficiency.
Solution Approach 2:
The powder capturing device is segmented into multiple flow path forming units, each containing catching units positioned at different locations. This segmentation allows the device to handle powder capture across multiple zones while maintaining continuous gas flow through each segment. The modular structure ensures that no single point blocks the entire gas flow path, thereby maintaining exhaust efficiency while providing comprehensive powder protection.
2Reliability
If the inside of the vacuum chamber is maintained in a vacuum state by the vacuum pump, then vacuum performance is improved, but scattered powder may enter the pump and adversely affect it during smoke phenomenon
Solution Approach 1:
The powder capturing device is positioned on the intake side of the vacuum pump to perform preliminary action by capturing powder particles before they can enter the pump. The catching units are strategically placed to intercept scattered powder during the smoke phenomenon, preventing harmful powder intrusion while allowing the vacuum pump to maintain optimal vacuum performance without contamination.
Solution Approach 2:
The flow path forming units serve as an intermediary barrier between the vacuum chamber environment and the vacuum pump. These units create a protective interface that allows gas to pass through while capturing powder particles, thus mediating between the need for vacuum performance and the need to prevent powder damage to the pump.
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 solution effectively suppresses powder intrusion into the vacuum pump while maintaining efficient exhaust, ensuring the apparatus operates without compromising vacuum performance.
Implementation Method 1
a first catching unit that causes powder sucked from the intake unit to collide to catch the powder, and a second catching unit that causes the powder passing through the first flow path forming unit to collide to catch the powder
Implementation Method 2
the vacuum pump that evacuates the gas in the vacuum chamber
Data Source
AI summary
A vacuum pump that evacuates an inside of a vacuum chamber and powder capturing devices disposed on an intake side of the vacuum pump are included. The powder capturing devices include a plurality of flow path forming units that form a continuous gas flow path from an intake unit located on the vacuum chamber side to an exhaust unit located on the vacuum pump side. The plurality of flow path forming units include a first flow path forming unit having a first catching unit that causes the powder sucked from the intake unit to collide and then catch the powder, and a second flow path forming unit having a second catching unit that causes the powder passing through the first flow path forming unit to collide and then catch the powder.