Adjustable Inner Air Deflector Fixing for Rotating Electrical Machines
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Solution Overview
Problem
Existing solutions for minimizing counter-flowing air currents between the fan blades and the inner deflector in electric machines are limited by requiring specific assembly phases and tools, and do not allow for flexible adjustment of the deflector position after the fan and deflective cover are mounted.
Innovation Solution
A system for fixing the inner air deflector on a deflective cover using elongated holes and screws/nuts that allows adjustment of the gap between the fan blades and the deflector from the outer part of the housing, enabling flexible positioning and assembly without specialized tools, by using hexagonal or rectangular shaped holes and nuts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the inner deflector is fixed onto the deflective cover before fan assembly, then the assembly process is simplified, but the gap between fan blades and deflector cannot be adjusted, causing air turbulence
Solution Approach 1:
The patent applies the dynamics principle by making the deflector position adjustable rather than fixed. The deflector can be positioned at different locations relative to the fan blades, allowing optimization of the gap distance. This dynamic positioning capability enables the system to adapt to different assembly tolerances and operational requirements, resolving the contradiction between assembly simplicity and airflow efficiency.
Solution Approach 2:
The patent implements parameter changes by allowing variation in the gap distance between the fan blades and the deflector. By adjusting this critical parameter, the system can minimize air turbulence and counter-flowing currents while maintaining ease of assembly. The adjustable positioning mechanism enables optimization of the gap parameter without complicating the assembly process.
2Productivity
If the gap between fan blades and deflector is made small to reduce turbulence, then airflow efficiency improves, but assembly tolerances cause physical contact between blades and deflector
Solution Approach 1:
The adjustable deflector positioning system allows dynamic compensation for assembly tolerances. The deflector can be positioned at optimal locations after assembly, ensuring the gap is neither too large nor too small. This resolves the contradiction by enabling small gaps for efficiency while maintaining reliability through post-assembly adjustment capability.
Solution Approach 2:
The patent applies preliminary action by pre-drilling elongated holes in the deflector that allow for position adjustment. These holes are designed with sufficient length to accommodate tolerance variations, enabling the deflector to be positioned optimally after assembly without requiring precise pre-positioning, thus compensating for assembly tolerances while maintaining small gaps for efficiency.
3Ease of operation
If the deflector is mounted last after fan and cover assembly, then gap adjustment is enabled, but assembly complexity increases
Solution Approach 1:
The patent applies segmentation by separating the deflector from the cover assembly, allowing independent positioning and adjustment of the deflector. The deflector is mounted separately on the fan assembly rather than being pre-fixed to the cover, enabling gap optimization without requiring complex integrated assembly procedures. This resolves the contradiction between adjustment capability and assembly complexity.
Solution Approach 2:
The patent uses the elongated holes as an intermediary mechanism that simplifies the adjustment process. These holes serve as a mediator between the fixed cover structure and the adjustable deflector, allowing position variation through simple screw hole alignment rather than complex adjustment mechanisms. This enables gap adjustment capability while maintaining relatively simple assembly procedures.
4Adaptability or versatility
If elongated holes are used for deflector fixation, then position adjustment is enabled, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-drilling the elongated holes in both the deflector and cover with sufficient dimensional tolerance. The holes are designed with length and positioning that accommodate assembly variations, allowing the deflector to be positioned optimally during assembly without requiring ultra-precise hole placement. This resolves the contradiction by enabling position adjustment flexibility while maintaining reasonable manufacturing precision requirements.
Data Source
AI summary
A system for fixing the inner air deflector on a deflective cover for a rotating electrical machine, wherein this deflector is fixed onto the deflective cover using a fixing element and a nut placed through elongated holes on flaps of the inner deflector and through elongated holes on the deflective cover, so that the tightening of the fixing set is performed from an outer part of the housing of the machine, enabling adjustment of a gap between an outer edge of blades of a fan and an inner surface of the inner air deflector, in order to minimize the effects of formation of counter-flowing air currents near the gap.