Composite Screw Pump Rotor for Strength and Vibration Damping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing screw pumps face challenges in enhancing performance and efficiency, particularly in terms of material reinforcement and vibration damping, which affect fluid flow and mechanical stability.
Innovation Solution
The design incorporates a center shaft made of a stiffer material, such as stainless steel, with a polymer screw body, and features like flexible couplings and anti-rotation tabs to enhance mechanical stability and reduce vibrations, while using polymers like polyphenylene sulfide (PPS) for screws with specific thread configurations to facilitate easy ejection from molds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the screw is made entirely of polymer material, then the screw pump can be manufactured with simple molding processes, but the mechanical strength and stiffness are insufficient leading to deformation under load
Solution Approach 1:
The screw is constructed as a composite structure with a metal center shaft providing structural strength and stiffness, and a polymer screw body providing the necessary mechanical properties for fluid pumping. This composite design resolves the contradiction by combining materials with complementary properties - the metal core ensures mechanical strength while the polymer exterior maintains ease of molding and pump functionality.
2Strength
If the screw is made entirely of metal material, then the mechanical strength and stiffness are sufficient, but the vibration damping performance is poor affecting fluid flow stability
Solution Approach 1:
The composite structure combines a metal center shaft for strength with a polymer screw body for vibration damping. The polymer material absorbs vibrations generated during pumping operations, while the metal core maintains the necessary mechanical strength. This resolves the contradiction by allowing each material to contribute its advantageous property.
3Stability of the object's composition
If a reinforced screw structure is added to enhance mechanical strength, then the structural stability improves, but the manufacturing complexity and cycle time increase
Solution Approach 1:
The metal center shaft is prepared in advance as a separate component before the polymer screw body is molded around it. This preliminary preparation allows the reinforced structure to be integrated into the molding process without requiring additional manufacturing steps, thus maintaining productivity while achieving the desired structural stability.
Solution Approach 2:
The composite construction with pre-prepared metal shaft and molded polymer body enables the reinforced structure to be created during the normal molding cycle, avoiding additional manufacturing steps and maintaining production efficiency while achieving enhanced structural stability.
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 improves mechanical stability, reduces deformation, and enhances fluid flow efficiency by minimizing vibrations and cycle times, thereby optimizing the performance of screw pumps.
Implementation Method 1
the first material is stiffer than the second material, for example such that the at least one screw is reinforced
Implementation Method 2
The anchoring feature or features can comprise at least two anchoring features, or at least two groups of anchoring features, that can be spaced along the length of the center shaft
Data Source
AI summary
Screw pump (2) comprising: a casing (3) with an inlet (30), an outlet (31) and a flow chamber (32) between the inlet and the outlet; at least two screws (4, 5, 6) housed in the flow chamber to force a fluid flow through the flow chamber from the inlet to the outlet; and a flexible coupling (11) connected to one of the screws to couple the screw to a drive motor (10).