Electrically Driven Pump Rotor Shield Design
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Solution Overview
Problem
Conventional electrically driven pumps for vehicle heat dissipation and heating circulation systems have complex structures and manufacturing processes, which increase manufacturing costs and reduce service life due to potential corrosion of the permanent magnet by the working medium.
Innovation Solution
The electrically driven pump features a rotor assembly with a shield and shaft sleeve design that forms an accommodating portion for the permanent magnet, preventing corrosion and simplifying the structure and manufacturing process, while maintaining efficient performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the permanent magnet is directly exposed to the working medium, then the structure is simpler, but the permanent magnet gets corroded and service life decreases
Solution Approach 1:
The shield is nested within the rotor assembly structure, forming a protective layer around the permanent magnet. The accommodating portion is created by the interaction between the shield and the shaft sleeve, with the permanent magnet housed within this nested configuration. This nesting approach provides corrosion protection while maintaining a compact overall structure.
Solution Approach 2:
The shield acts as an intermediary component between the permanent magnet and the working medium. It prevents direct contact between the permanent magnet and the corrosive environment, thereby protecting the magnet without significantly complicating the overall rotor assembly structure.
2Ease of manufacture
If conventional rotor assembly structures are used, then the design is well-established, but the manufacturing process becomes complex and costly
Solution Approach 1:
The shield and shaft sleeve are combined to form an integrated accommodating portion for the permanent magnet. This merging of components simplifies the manufacturing process by reducing the number of separate parts that need to be produced and assembled, while still providing the necessary corrosion protection for the permanent magnet.
3Duration of action of stationary object
If the permanent magnet is protected from corrosion, then service life increases, but the structure becomes more complex
Solution Approach 1:
The shield provides localized corrosion protection specifically where the permanent magnet is positioned, rather than requiring comprehensive protection of the entire rotor assembly. This targeted approach extends service life of the permanent magnet without unnecessarily complicating other parts of the rotor assembly structure.
Data Source
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AI summary
An electrically driven pump is provided, which includes a rotor assembly. The rotor assembly includes an impeller, a rotor and a shaft sleeve assembly. The impeller is arranged on one end of a shaft sleeve, and the rotor is arranged on another end of the shaft sleeve away from the end on which the impeller is mounted. The rotor includes a rotor core, a permanent magnet and a shield. The permanent magnet is arranged around an outer peripheral surface of the rotor core and fits the outer peripheral surface of the rotor core. The shield is fixed to the shaft sleeve, and an accommodating portion configured to accommodate the rotor core and the permanent magnet is formed between the shield and the shaft sleeve. The electrically driven pump has a simple structure and is easy to manufacture.