Archimedes Screw Sector Assembly for Torque and Continuity
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Solution Overview
Problem
Existing Archimedean screw assembly methods face issues with discontinuity of turns, torque transmission, and material damage due to sharp edges and gaps, particularly when handling viscous or fibrous fluids, limiting the lifespan and efficiency of the screw.
Innovation Solution
The kit features sectors with a single thick turn and a sinusoidal core that interlock without gaps or sharp edges, maximizing contact surface and torque transmission, using a helical curve offset to create a wide bearing face and inclined termination faces for secure assembly on an axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sectors are assembled with turns ending on a very thin edge in the shape of a whistle, then the screw can be manufactured by successive stacking, but sharp edges are formed that damage the product and reduce service life
Solution Approach 1:
The patent replaces the sharp whistle-shaped edge with a rounded or beveled termination edge. The turn ends with a curved surface instead of a sharp edge, eliminating the harmful factor while maintaining the stackable sector design. This curvature prevents material damage during operation.
Solution Approach 2:
The patent converts the potentially harmful thin edge into a beneficial feature by rounding it to create a smooth transition zone. The rounded edge serves both as a safe termination that prevents damage and as a guide for proper sector alignment during assembly.
2Strength
If sectors have several pitches in length to ensure mechanical resistance, then torque transmission is improved, but the screw cannot be made short for dosing systems
Solution Approach 1:
The patent divides the screw into multiple short sectors, each with a single pitch, that can be assembled to achieve the desired total length. This segmentation allows flexibility in creating both short dosing screws and long transport screws by varying the number of sectors used.
Solution Approach 2:
The sectors are pre-designed with reinforcement zones and optimized thickness distributions that provide sufficient mechanical resistance even at short lengths. The preliminary design of each sector includes strengthened root zones and optimized profiles that maintain strength regardless of the final assembled length.
3Power
If sectors are assembled on an axis with interlocking parts, then torque transmission between sectors is enabled, but the connection zones become weak and risk tearing under mechanical stress
Solution Approach 1:
The patent merges the torque transmission function into the main body of the sector rather than using separate interlocking parts. The helical groove itself serves as the torque transmission element, distributing stresses across the entire sector surface rather than concentrating them at discrete connection points.
Solution Approach 2:
The patent uses a continuous helical groove that acts as a flexible stress-distributing element. This groove structure allows for elastic deformation under load, distributing mechanical stresses uniformly across the sector connections rather than creating rigid stress concentration points.
4Ease of manufacture
If gaps are present between sectors during assembly, then manufacturing is simplified, but discontinuity of turns is created that reduces efficiency
Solution Approach 1:
The patent applies different geometric characteristics to different parts of the sector. The main body maintains the standard helical shape for efficient material transport, while the termination zones feature complementary curved surfaces that ensure tight mating between adjacent sectors, eliminating gaps without complicating manufacturing.
Data Source
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AI summary
A device for improving the method of manufacturing Archimedes screws by assembling sectors. The invention relates to a device for producing an Archimedes screw by assembling sectors on a shaft (13) without forming gaps, cutting edges or weak regions between one another and ensuring the continuity of the turns of which said screw consists. It consists of a sector (3) having a turn with a length equal to one screw thread and having a geometry that enables it to be interlocked with another, identical sector (3). The turn sits on a core, the geometry of which is obtained by following in each case a helical generatrix which is offset through at least one turn thickness. The terminal face of the turn is inclined at an angle with respect to the axis of the sector. The device according to the invention is particularly intended for the production of systems for metering or pumping viscous, pulverulent or granular products, said systems comprising at least one Archimedes screw.