Plunging Siphon Guide Detachment Section Powder Ejection
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Solution Overview
Problem
Conventional siphons experience issues with the precise ejection of powder compacts due to tilting during the ejection process, leading to reduced aiming accuracy and increased powder losses, especially when filling small target containers, and provide insufficiently precise results with 100% in-process control using AMV sensors.
Innovation Solution
The siphon design incorporates a guide section and a detachment section within the inner peripheral wall, where the detachment section has a radially expanded cross-section compared to the guide section, allowing for a gradual and non-sudden detachment of the powder compact, reducing tilting moments and enabling precise ejection and accurate capacitive measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional cylindrical dosing chamber is used, then the powder compact is ejected parallel to the axis initially, but the compact experiences tilting moments and performs tilting movement just before detachment
Solution Approach 1:
The inner peripheral wall is divided into two distinct sections: a guide section with constant cross-section and a detachment section with radially expanded cross-section. This segmentation allows the compact to be guided stably during ejection while providing a controlled detachment zone that prevents tilting moments, resolving the contradiction between ejection precision and orientation stability.
Solution Approach 2:
Different sections of the dosing chamber have different geometric properties: the guide section maintains a constant cross-section for stable guidance, while the detachment section has a radially expanded cross-section to eliminate tilting moments. This local differentiation of geometric quality allows the compact to maintain orientation stability throughout the ejection process.
2Manufacturing precision
If the powder compact is ejected with tilting movement, then the aiming accuracy is impaired, but ensuring complete transfer to small target containers becomes laborious
Solution Approach 1:
By segmenting the dosing chamber into guide and detachment sections, the compact is guided precisely during ejection and detached without tilting. This ensures high aiming accuracy for small target containers while maintaining efficient operation, as no additional precautions or adjustments are needed.
Solution Approach 2:
The invention replaces the need for mechanical adjustments or precautions to prevent tilting with a geometric design of the dosing chamber. The radially expanded detachment section inherently eliminates tilting moments through its geometry, substituting complex mechanical control with a simple structural feature.
3Extent of automation
If AMV sensors are used for capacitive measurement, then in-process control is implemented, but the measurement precision is insufficient
Solution Approach 1:
The invention replaces the inadequate capacitive measurement system with a geometric control mechanism. By controlling the compact's orientation and ejection path through the guide and detachment sections, the system enables precise measurement without relying on imprecise AMV sensors, achieving both automation and high measurement precision.
Data Source
Figure 1~3
Figure 4~7
Figure 8~9
AI summary
The invention relates to a pipette (1) for dosing powder. The pipette (1) comprises a pipette sleeve (3) and a dosing piston (4) having an end face (14). The pipette sleeve (3) extends along a longitudinal axis (5) and has a free end (6) and, on the inside, an inner peripheral wall (7) running about the longitudinal axis (5) in a closed manner. The inner peripheral wall (7) extends in the direction of the longitudinal axis (5) up to the free end (6) of the pipette sleeve (3) and ends there in a pipette edge (8) running about the longitudinal axis (5). The dosing piston (4) is guided such that it can move inside the inner peripheral wall (7) in parallel to the longitudinal axis (5). In addition, in an inserted dosing position of the dosing piston (4), the end face (14) delimits a dosing chamber (19) together with the inner peripheral wall (7). In the region of the dosing chamber (19), the inner peripheral wall (7) is divided into a guide section (9) and a release section (10) bordering the guide section (9) and extending up to the pipette edge (8). The inner peripheral wall (7) extends in the guide section (9) in parallel to the longitudinal axis (5), wherein the release section (10) surrounds a cross-section of the dosing chamber (19) that is radially broader in comparison with the guide section (9).