Injection Molded Housing Transverse Core for Centrifugal Pumps
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Solution Overview
Problem
Injection-molded housings for fluid-carrying devices, such as centrifugal pumps, face challenges in providing favorable flow conditions while being easier to manufacture than cast iron housings, which are difficult to produce but offer better performance.
Innovation Solution
An injection-molded housing with a transverse core arrangement that creates a flow path with minimal pressure loss, using a wall extending transversely to the central axis of the chamber, and a convex curve to ensure smooth fluid flow, allowing for efficient production using injection molding techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If cast iron housing is used, then flow conditions are improved and pressure losses are reduced, but manufacturing complexity increases
Solution Approach 1:
The patent changes the material parameter from cast iron to plastic/composite materials, and modifies the geometric parameters of the inlet channel by introducing a transverse wall at an angle of 5-45 degrees to the central axis. This angular parameter optimization creates favorable flow conditions that reduce pressure losses while maintaining the manufacturing advantages of injection molding.
Solution Approach 2:
The patent employs plastic and/or composite materials for the housing, combining materials with different properties to achieve both favorable flow conditions and ease of manufacture. The composite material approach allows for complex geometries like the angled transverse wall to be integrated into the injection molding process, achieving both performance and manufacturing advantages.
2Ease of manufacture
If injection molded housing is used, then ease of manufacture is improved, but flow conditions deteriorate and pressure losses increase
Solution Approach 1:
The patent applies local quality optimization by introducing a transverse wall specifically in the inlet channel region where flow conditions are most critical. This localized geometric modification, positioned at an angle of 5-45 degrees to the central axis, creates favorable flow patterns in the inlet area without compromising the overall simplicity of the injection molded structure.
Solution Approach 2:
The patent adds a dimensional element by introducing a transverse wall that extends perpendicular to the central axis of the chamber. This three-dimensional geometric feature creates a flow path that reduces pressure losses while remaining compatible with injection molding processes, effectively adding complexity only where needed for flow optimization.
3Loss of energy
If transverse wall is added to inlet nozzle, then pressure losses are reduced, but device complexity increases
Solution Approach 1:
The patent segments the inlet nozzle structure by introducing a transverse wall that divides the inlet channel into distinct flow regions. This segmentation creates favorable flow patterns by separating the flow path into controlled zones, reducing turbulence and pressure losses while maintaining relatively simple overall structure.
Solution Approach 2:
The patent employs curved surfaces and angular transitions in the inlet channel design, with the transverse wall positioned at optimized angles (5-45 degrees) to create smooth flow transitions. These curved and angular geometric features reduce flow separation and turbulence, minimizing pressure losses without creating overly complex structural forms.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
An injection-molded housing made of plastic and/or a composite material for a fluid-carrying device, in particular for a centrifugal pump, comprises: - an inlet nozzle (3) with an inlet channel (4) for a fluid, - an outlet nozzle (5) with an outlet channel (6), - a chamber (2) for a rotatable impeller, wherein the chamber (2) has an inlet opening (16) into which a proximal end (41) of the inlet channel (4) opens, and - a mounting area (20) extending radially outwards, substantially perpendicular to a central axis (30) of the chamber (2), wherein the inlet nozzle (3) has a wall (31) that delimits at least a part of the proximal end (41) of the inlet channel (4) and at least a part of the inlet opening (16), wherein the wall (31) extends transversely to the central axis (30), and wherein the wall (31) is formed by Injection molding with a core (101) that runs transversely to the central axis (30) of the chamber (2).