Motor Centrifugal Pump Stator Cooling Ducts
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Solution Overview
Problem
Motor-driven centrifugal pumps face challenges with high thermal loads in the stator and motor electronics due to poor thermal dissipation, and have high manufacturing and assembly costs due to complex assembly requirements and costly cooling channel arrangements in existing designs.
Innovation Solution
Incorporating cooling ducts within the plastic material of the stator core, allowing a medium to flow through and reduce temperatures, and simplifying the assembly process by integrating multiple functions into a single plastic injection molding process, eliminating the need for additional parts and housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the stator core is encapsulated with plastic, then the structural integrity and sealing are improved, but the thermal dissipation deteriorates due to plastic being a good thermal insulator
Solution Approach 1:
The patent introduces a thermal management medium (coolant) as an intermediary substance that flows through channels in the plastic encapsulation. This mediator carries heat away from the stator core, enabling thermal dissipation while maintaining the plastic's structural integrity and sealing functions.
Solution Approach 2:
The patent employs hydraulic cooling by circulating a liquid medium through dedicated cooling channels integrated into the plastic encapsulation. This hydraulic system efficiently removes heat from the stator core, resolving the thermal insulation problem while preserving the structural benefits of plastic encapsulation.
2Ease of manufacture
If multiple separate parts are used for the motor components, then the manufacturing flexibility is improved, but the assembly complexity and costs increase
Solution Approach 1:
The patent merges multiple motor components (stator core, encapsulation, cooling channels, and housing) into a single integrated plastic injection-molded part. This consolidation eliminates the need for separate assembly steps, reducing assembly complexity and costs while maintaining manufacturing flexibility through the injection molding process.
Solution Approach 2:
The plastic encapsulation serves multiple functions simultaneously: it provides structural support, sealing, electrical insulation, and houses the cooling channels. This multi-functionality reduces the number of separate components needed, simplifying assembly while maintaining manufacturing flexibility.
3Temperature
If cooling channels are arranged in the bearing shell, then the cooling function is improved, but the manufacturing and assembly costs increase considerably
Solution Approach 1:
The patent combines the cooling channel functionality with the plastic encapsulation of the stator core into a single integrated component. This merging eliminates the need for separate cooling channel assemblies in the bearing shell, reducing manufacturing and assembly costs while maintaining effective cooling.
Solution Approach 2:
The cooling channels are pre-formed as integral features of the plastic encapsulation during the injection molding process. This preliminary action incorporates the cooling function into the base structure, avoiding the need for subsequent assembly steps and reducing overall manufacturing costs.
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
This approach effectively reduces stator and electronics temperatures, minimizes manufacturing and assembly costs, and integrates cooling functions into a single, structurally simplified design.
Implementation Method 1
the plastic being injected into the stator interspaces to form the cooling ducts
Implementation Method 2
the high temperatures on the stator and the electronics required to regulate or control the pump are reduced by medium-filled cooling channels
Data Source
AI summary
The invention relates to a motor centrifugal pump having a plastic-injection-moulded stator core of the electric motor, wherein cooling channels are arranged in the plastic, through which channels the conveying medium flows.