Rotary Machine Casing Fins for Convection
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Solution Overview
Problem
The existing heat exchange systems in rotating electrical machines face challenges in maintaining a high convection coefficient along the casing height, particularly in the front region, due to reduced air flowing speed, which complicates the manufacturing and painting processes by increasing the complexity and cost, and leading to non-uniform paint application and burr removal issues.
Innovation Solution
A heat exchange system with modified geometry fins, featuring interleaved trapezoidal or rectangular section structures in the front region, which increases the heat exchange area without altering the manufacturing complexity, including the painting process, by maintaining an optimal height-to-distance ratio and enhancing air flow convection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the height per distance ratio between fins is increased to maximize convection coefficient, then heat exchange efficiency is improved, but manufacturing complexity and painting difficulty increase
Solution Approach 1:
The patent applies local quality by modifying the fin geometry specifically in the front region of the casing where air flow speed is highest. The fins in this region have optimized height and spacing parameters to maximize convection, while fins in other regions maintain standard dimensions. This localized optimization achieves improved heat exchange efficiency without requiring complex modifications throughout the entire casing structure.
2Temperature
If complex fin structures (labyrinth or segregated) are used to overcome convection coefficient reduction, then heat exchange is improved, but manufacturing cost and painting difficulty increase
Solution Approach 1:
The patent changes the geometric parameters of the fins (height, spacing, and cross-sectional shape) in the front region to optimize convection coefficient. By adjusting these parameters rather than adopting complex labyrinth or segregated structures, the solution achieves improved heat exchange while maintaining manufacturing simplicity and painting ease. The fin parameters are specifically tailored to the local air flow conditions without requiring complex structural modifications.
3Temperature
If non-uniform fin distribution is used to compensate for air speed reduction along casing height, then heat exchange is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by implementing different fin configurations in specific regions. The front region features modified fin parameters (height and spacing) optimized for high-velocity air flow, while other regions maintain uniform standard fins. This regional differentiation compensates for air speed reduction along the casing height without requiring non-uniform fin distribution throughout, thereby maintaining manufacturing precision and simplifying production.
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 solution effectively increases the convection coefficient in the front region of the rotating electrical machine casing, enhancing heat exchange efficiency while simplifying the manufacturing and painting processes by maintaining a uniform and cost-effective approach.
Implementation Method 1
an alternative purpose of the rotating electrical machine casing, equipped with modified geometry fins, interleaved with the neighbor fins, in the front longitudinal region, in which the heat exchange area increment occurs, free of cost to the manufacturing process
Data Source
AI summary
A heat exchange system for casings of rotary electric machines is described herein. The heat exchange system applied to the rotating electrical machine casing and the machine is equipped with a finned casing comprising a number of fins equipped with a modified profile, each one interleaved with complementary fins, both profiles distributed over the external surface of the casing. The fins have a predominantly continuous profile, supported in parallel along the casing height, and respectively show projections from a guideline, with structures with trapezoidal or rectangular section being interleaved to one another in a front region of the machine.