AC Generator Casing Protrusion for Cooling Airflow Management
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Solution Overview
Problem
The vehicle AC generator experiences a decrease in cooling air volume and pressure rise due to a gradually increasing suction port diameter, leading to increased leakage flow and reduced cooling effectiveness, resulting in elevated component temperatures and decreased power generation.
Innovation Solution
The AC generator incorporates a protrusion on the casing surface adjacent to the fan's tip end, increasing the air passage area and reducing pressure loss, thereby enhancing the cooling effect on stator windings and rectifier elements by increasing the air volume and momentum of the cooling air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the suction port diameter gradually increases toward the fan, then the structure is simplified and manufacturing is easier, but the air volume of cooling air decreases and pressure rise is reduced
Solution Approach 1:
The patent changes the geometric parameters of the suction port by introducing a protrusion that creates an inflection point in the diameter profile. This modifies the gradual expansion pattern to include a section where the diameter remains constant or expands more slowly, optimizing the balance between manufacturing simplicity and cooling air volume while reducing leakage flow
2Ease of manufacture
If the suction port diameter gradually increases toward the fan, then the structure is simplified, but pressure loss in the air passage increases
Solution Approach 1:
The protrusion introduces a specific geometric parameter change that creates an inflection point in the suction port diameter profile. This modifies the pressure distribution in the air passage, reducing pressure loss by optimizing the expansion pattern while maintaining manufacturing simplicity
3Ease of manufacture
If the suction port diameter gradually increases toward the fan, then the structure is simplified, but leakage flow of cooling air increases
Solution Approach 1:
The protrusion creates an inflection point in the suction port diameter profile, changing the pressure distribution pattern. This reduces the pressure gradient that drives leakage flow from the outlet port back to the suction port, thereby reducing harmful leakage flow while maintaining structural simplicity
Solution Approach 2:
The protrusion is positioned to preemptively counteract the pressure gradient that causes leakage flow. By creating an inflection point in the diameter profile before the leakage flow can significantly develop, the design prevents the harmful effect rather than addressing it after occurrence
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 configuration increases the air volume and momentum of the cooling air, reducing leakage flow and component temperatures, and improving power generation efficiency without increasing noise levels.
Implementation Method 1
a fan installed oppositely to the ventilation port in the casing and rotated integrally with the rotor
Implementation Method 2
by providing the protrusion on a surface of the casing opposing the tip end of the fan at a position adjacent to the outer periphery of the ventilation port of the casing, an area of an air passage of the cooling air can be increased and hence an air volume generated by the fan can be increased
Implementation Method 3
enhance a cooling effect on a stator winding and rectifier elements by lessening a pressure loss in an air passage of airflow generated by a fan of a vehicle AC generator and also by increasing an air volume of cooling air
Data Source
AI summary
A vehicle AC generator capable of enhancing a cooling effect by increasing an air volume of cooling air is obtained. The AC generator includes: a casing having a ventilation port on an outer periphery; a stator installed in the casing; a rotor supported in the stator in a rotatable manner; a fan installed oppositely to the ventilation port in the casing and rotated integrally with the rotor; and a protrusion formed on a surface of the casing opposing a tip end of the fan at a position adjacent to an outer periphery of the ventilation port of the casing.