Rotor Assembly Integrating Cylindrical Separating Can
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Solution Overview
Problem
High-speed radial fans face challenges in achieving a compact design with high power density due to the need for a separate magnetic coupling, which results in undesirable friction and rapid wear from abrasive shaft seal rings, and requires complex bearing alignment and sealing between the rotor and stator.
Innovation Solution
A rotor assembly with a bearing tube that is axially open, housing the rotor in a single-piece cylindrical separating can within the fan housing, eliminating the need for a magnetic coupling and allowing for direct drive, while using a central bearing arrangement and minimizing electrical conductivity and magnetic permeability to reduce losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate magnetic coupling is used to drive the rotor, then the rotor can be sealed from the stator, but the device complexity and installation space increase
Solution Approach 1:
The patent combines the separating can housing with the fan housing into a single integrated component. The separating can is formed as a single piece with the fan housing, eliminating the need for separate magnetic coupling components while maintaining the seal between rotor and stator. This merging reduces device complexity and installation space.
2Reliability
If a separate magnetic coupling is used, then sealing is achieved, but the installation space and power density are reduced
Solution Approach 1:
The separating can and fan housing are merged into a single integrated component, reducing the overall volume and installation space required while maintaining effective sealing between the rotor and stator regions.
Solution Approach 2:
The integrated housing serves multiple functions: it provides the fan housing structure, acts as the separating can for magnetic coupling isolation, and maintains the air gap for rotor clearance, thereby reducing the need for separate components.
3Device complexity
If abrasive shaft seal rings are used for sealing, then sealing without separating can is achieved, but friction and wear increase
Solution Approach 1:
The patent replaces mechanical shaft seal rings with magnetic coupling-based sealing. The magnetic coupling creates a non-contact seal between the rotor and stator regions, eliminating the mechanical friction and wear associated with abrasive shaft seal rings.
4Ease of manufacture
If bearing seats are separated, then assembly is simplified, but bearing alignment precision deteriorates
Solution Approach 1:
The bearing seats are integrated into a single unified housing structure rather than being separated. This ensures precise bearing alignment while maintaining ease of assembly, as the integrated structure eliminates the need for complex multi-step alignment procedures.
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 design achieves optimal sealing, compactness, and ease of balancing, with improved heat dissipation and efficiency, suitable for high-speed operations and adaptable through various scaling options.
Implementation Method 1
The contact resistance of the separating can material should not be below 10 Ohm. The material of the separating can is not a good electrical conductor, because this leads to eddy-current losses due to the rotating magnets.
Implementation Method 2
A magnetic permeability of the separating can material should likewise be close to 1, because, otherwise, parts of the magnetic field become shielded.
Data Source
AI summary
The disclosure relates to a high-speed radial fan and to a rotor assembly (10) for a high-speed radial fan, comprising a bearing tube (20) which is axially open in the interior and in which a shaft (40) carrying a fan wheel (30) is mounted with a rotor (50), wherein the rotor (50) of the rotor assembly (10) is mounted in a cylindrical separating can (3).