Centrifugal Pump Head Star-Shaped Inlet for Distortion Control
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Solution Overview
Problem
Centrifugal pump heads face challenges in achieving high hydraulic efficiency while maintaining mechanical stability and avoiding distortion during manufacturing, particularly due to material accumulation issues at the inlet connection, which leads to reduced efficiency and stability problems.
Innovation Solution
The design features axially extending support ribs on the inlet connection and radially oriented housing ribs that form a star point, allowing for symmetrical and stable pump head production without material pockets, enabling demolding in the extension direction and enhancing stability through a conical inner diameter design, facilitating the removal of the pump head from the mold without flow obstacles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If additional projections or cores are introduced to prevent material accumulation at the inlet connection, then distortion of the pump head is avoided, but hydraulic efficiency is reduced due to flow obstacles
Solution Approach 1:
The invention converts the harmful effect of material accumulation into a beneficial design feature by intentionally creating a star-shaped cross-section at the inlet connection. This star shape with multiple points directs material flow away from the inlet area, preventing accumulation and distortion while maintaining smooth coolant flow paths that do not obstruct hydraulic efficiency
Solution Approach 2:
The patent introduces asymmetry through the star-shaped cross-section at the inlet connection, which has multiple points radiating outward. This asymmetric geometry prevents symmetric material accumulation that would cause distortion, while the strategic positioning of star points ensures coolant flow is guided efficiently through the pump head without creating harmful flow obstacles
2Shape
If the outer diameter of the inlet connector is significantly larger than the inlet cross section, then material accumulation is prevented, but additional projections or cores are required that reduce hydraulic efficiency
Solution Approach 1:
The invention transitions from a conventional circular inlet cross-section to a star-shaped cross-section with multiple points. This dimensional change in geometry allows the inlet connector to have an optimized outer diameter without creating material accumulation zones, as the star points naturally direct material flow in multiple directions, preventing pooling while maintaining hydraulic efficiency
3Strength
If reinforcing ribs are added to increase mechanical stability, then wall thickness can be reduced, but demolding becomes difficult due to undercuts
Solution Approach 1:
The patent employs movable side slides that can shift position during the demolding process. These slides are positioned to form the star-shaped inlet connection and supporting ribs. During demolding, the slides move laterally to create clearance, allowing the pump head to be removed without damage. This dynamic adjustment resolves the conflict between creating reinforcing structural features and enabling easy demolding
4Ease of manufacture
If multiple axial slides are used to form annular channel and inlet channel, then undercuts are managed, but demolding in axial direction causes distortion at the inlet connection
Solution Approach 1:
The invention uses side slides that move laterally (perpendicular to the axial demolding direction) rather than axially. This dynamic lateral movement allows the slides to form the star-shaped inlet connection and annular channel without creating undercuts that would prevent demolding. The slides shift to create clearance in the radial direction, enabling axial removal of the pump head without distorting the inlet connection geometry
Data Source
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AI summary
The head (200) has a pump housing (202) in which an annular channel is formed, and an axial inlet port (204) comprising an end facing away from the annular channel with smaller diameter than another end of the annular channel. A flange (210) fixes the pump head to a pump housing. Housing ribs (222, 228) are formed on opposite side of the pump head. Axially extending support ribs (226) are formed on outer circumference of the inlet port. The axial support ribs at the intake connecting piece are extended to the housing ribs. An independent claim is also included for a method for manufacturing a pump head for a centrifugal pump.