Impeller Ventilation Layout for Cooler Motor Airflow Routing
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Solution Overview
Problem
Existing ventilation devices for motor vehicles dissipate secondary air flow towards the rear of the impeller, where it is reheated, reducing the effectiveness of heat dissipation for electric motors and their components.
Innovation Solution
A motorized ventilation device with a centrifugal device positioned between the cup and bell cap of the impeller, which guides and accelerates air flow to optimize cooling by redirecting it from one side of the impeller to the other, utilizing vanes and orifices to enhance air flow orientation and cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the secondary air flow is dissipated out of the impeller toward the rear side where the motor is located, then the air flow can be redirected toward the motor, but the cooling effectiveness is reduced because the air flow has been heated from being used to cool the electric motor
Solution Approach 1:
The patent inverts the conventional air flow direction by redirecting the secondary air flow from the rear side toward the front side of the impeller through the centrifugal device, instead of dissipating it toward the motor location. This reversal ensures that cool air reaches the motor components without being pre-heated by previous cooling cycles.
Solution Approach 2:
The centrifugal device acts as an intermediary mechanism between the air flow and the motor components. It actively redirects and accelerates the air flow through its vanes, ensuring that cool air is delivered to the motor components with enhanced cooling effectiveness rather than allowing direct dissipation.
2Temperature
If the centrifugal device is added to guide and accelerate air flow, then the cooling performance is improved, but the device complexity increases
Solution Approach 1:
The centrifugal device is merged with the existing impeller structure, where its vanes are integrated into the impeller body. This combination allows the centrifugal function to be achieved without adding a completely separate component, thereby improving cooling performance while minimizing the increase in device complexity.
Solution Approach 2:
The centrifugal device serves multiple functions: it guides the air flow, accelerates the air flow, and redirects it toward the motor components. This multi-functionality allows a single added component to achieve several cooling-related objectives, improving overall cooling performance without proportionally increasing complexity.
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
Improves the cooling performance of electric motors by creating a pressure difference that directs air flow effectively through the impeller, optimizing the supply of cool air for better heat dissipation and motor performance.
Implementation Method 1
a centrifugal device disposed between the cup and the bell cap and configured to guide and to accelerate an air flow
Implementation Method 2
the rotation movement of the blades of the impeller create a pressure difference between each side of the impeller. This pressure difference then leads to the creation of an air flow
Implementation Method 3
The secondary air flow is thus used to dissipate the heat released by the electric motor and by its electric components
Data Source
AI summary
A motorized ventilation device for a motor vehicle, comprising an impeller (1) free to rotate about an axis (X) and formed by a cup (2), on which blades (3) are disposed, a bell cap (6) of an electric motor partly housed inside the cup (2), a centrifugal device (8) disposed between the cup (2) and the bell cap (6) and configured to guide and to accelerate an air flow (F2). The cup (2) comprises at least one opening (20, 27) for the passage of the air flow (F2) and the bell cap (6) comprises at least one orifice (65, 66, 67) for the passage of the air flow (F2).