Powder Module Sealing for Inert Atmosphere Transport
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Solution Overview
Problem
Existing powder module devices for additive manufacturing lack reliable sealing between the powder module and lid, which compromises the inert atmosphere during transportation between process stations, leading to potential contamination and loss of material.
Innovation Solution
A powder module device equipped with an expandable sealing element made of elastomer material, which can be filled with a pressurized expansion medium to create a fluid-proof seal between the powder module and lid, maintaining the inert atmosphere and allowing for secure transportation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple sealing structure is used between powder module and lid, then device complexity is reduced, but sealing reliability deteriorates leading to loss of inert atmosphere
Solution Approach 1:
The sealing element is designed to be expandable from a first expansion state to a second expansion state. In the closed position, the sealing element expands to provide enhanced sealing contact between the powder module and lid, ensuring reliable sealing. When the lid is open, the sealing element remains in a compressed state, reducing interference with the opening/closing operation and simplifying the overall structure.
Solution Approach 2:
The sealing element's physical state is dynamically changed between expanded and compressed states depending on the lid position. This parameter change allows the sealing structure to adapt its properties: providing high sealing force when closed, and minimal interference when open, thereby resolving the contradiction between sealing reliability and structural simplicity.
2Ease of operation
If the lid is frequently opened and closed for material loading, then ease of operation is improved, but sealing reliability deteriorates due to wear and potential contamination
Solution Approach 1:
The expandable sealing element dynamically adapts its state based on lid position. During frequent opening/closing operations for material loading, the sealing element remains compressed and does not interfere with the motion. Once the lid closes, the sealing element automatically expands to ensure reliable sealing, thus maintaining both ease of operation and sealing reliability despite frequent cycles.
Solution Approach 2:
The sealing element is positioned and dimensioned to provide a cushioning effect that absorbs minor misalignments and wear during repeated opening/closing operations. This beforehand cushioning protects the sealing interface from damage during material loading operations while maintaining sealing integrity.
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 expandable sealing system ensures a reliable, fluid-proof seal between the powder module and lid, maintaining the inert atmosphere within the device and enabling safe transportation without compromising the internal environment, thus enhancing the operational reliability and efficiency of additive manufacturing processes.
Implementation Method 1
which can be filled with a pressurized expansion medium so as to expand the expandable sealing element from a first expansion state to a second expansion state
Implementation Method 2
an expandable sealing element made of elastomer material, which can be filled with a pressurized expansion medium so as to expand the expandable sealing element
Data Source
AI summary
Powder module device (1) for an apparatus for additively manufacturing three-dimensional objects by successive layerwise selective irradiation and consolidation of layers of a powdered build material (2). The device includes a powder module (3), comprising a powder module base body (6) to receive a powdered build material (2), comprising wall elements; delimiting a build material receiving volume (9) for receiving a powdered build material (2) and an opening (10) for introducing powdered build material (2) into the build material receiving volume (9); a lid (4), comprising a lid base body (11) connected to the powder module base body (6) so as to close the opening (10) of the powder module base body (6) in a closed state of the powder module device (1); and a sealing device (5) configured to seal between the powder module (3) and the lid (4) in the closed state of the powder module device (1).