Ventilation device, ventilation unit, and power conversion device
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Solution Overview
Problem
The design and manufacturing of ventilation devices for power conversion units are complicated due to the need for accurate positioning of the rotation axis of shutters, which can lead to improper opening and closing operations and pressure loss over time, affecting cooling performance.
Innovation Solution
A ventilation device design that includes a shutter case with a rotatable shutter partitioning it into positive and negative pressure chambers, where the shutter's center of gravity is positioned closer to one end than the rotation shaft, allowing for reliable opening and closing without precise axis alignment, and utilizing a stopper to maintain inclination and prevent short circuits between ventilation devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the shutter is rotatably provided on the hood and the opening/closing operation is performed using the own weight of the shutter or the wind pressure of the fan, then the structure is simple, but it is necessary to accurately position the rotation axis with respect to the shutter, which complicates the design and manufacturing operations
Solution Approach 1:
The shutter is designed to automatically open and close based on pressure differences created by fan operation. The shutter opens when the fan operates (positive pressure region) and closes when the fan stops (negative pressure region), eliminating the need for external driving devices or complex positioning mechanisms.
Solution Approach 2:
The invention uses pressure differences (pneumatic principle) to drive the shutter operation. The shutter is positioned to receive greater pressure from the positive pressure region than from the negative pressure region, causing automatic opening during fan operation and automatic closing when the fan stops, without requiring mechanical driving devices.
2Reliability
If the shutter is designed to be reliably closed by its own weight, then the shutter is too heavy and the exhaust port cannot be opened by the wind pressure of the fan, but if the shutter is made lighter to be opened by fan pressure, then it cannot be reliably closed
Solution Approach 1:
The invention replaces gravitational closure with pressure-driven operation. The shutter is positioned to receive greater pressure from the positive pressure region than from the negative pressure region, enabling automatic opening during fan operation. The shutter's light weight is sufficient for both opening and closing operations driven by pressure differences.
Solution Approach 2:
The invention changes the operating principle from gravitational force to pressure differential force. By positioning the shutter to receive different pressures from different regions, the system achieves reliable opening and closing without relying on the shutter's weight, allowing the shutter to be lighter while maintaining functionality.
3Device complexity
If a simple structure is used for opening and closing the shutter without using a driving device, then the device complexity is reduced, but the pressure loss in the device varies depending on the power conversion device, causing the wind pressure of the fan to decrease or the rotating shaft to deteriorate over time
Solution Approach 1:
The shutter system operates autonomously based on pressure differences created by fan operation. No external driving devices are needed, and the system adapts to varying pressure conditions automatically, maintaining reliable operation over time without mechanical wear from additional moving parts.
Solution Approach 2:
The invention uses pressure differences to drive shutter operation, eliminating mechanical driving devices. The shutter is positioned to receive greater pressure from the positive pressure region, ensuring reliable opening and closing operations that adapt to varying pressure conditions without additional mechanical components that could deteriorate.
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
Facilitates easier design and manufacturing of shutters, ensures reliable ventilation, and maintains effective cooling of power conversion units even when ventilation devices are stopped or fail, reducing manufacturing costs and improving cooling efficiency.
Implementation Method 1
The fan blows outside air into the housing through the opening and exhausts air inside the housing to the outside through the opening. The first chamber is a first region of one of a positive pressure region and a negative pressure region of the fan. The second chamber is a second region of the other of the positive pressure region and the negative pressure region of the fan.
Implementation Method 2
The shutter is provided so that the pressure received from the second chamber is smaller than the pressure received from the first chamber. The shutter opens and closes the opening by a rotation operation.
Implementation Method 3
the shutter is rotatably provided on the hood and the exhaust port is closed by the weight of the shutter
Data Source
AI summary
A ventilation device of an embodiment includes a housing, a shutter case, a fan, and a shutter. The shutter case has an opening. The fan is configured to exhaust air inside the housing to outside through the opening. The shutter partitions inside of the shutter case into a first chamber communicating with the opening and a second chamber different from the first chamber, and opens and closes the opening by a rotating operation. The fan is arranged on a first chamber side of the shutter case in the housing. The first chamber is a positive pressure region of the fan. The second chamber is a negative pressure region of the fan. The second chamber of the shutter case communicates only with the negative pressure region in the housing. The shutter is provided so that a pressure received from the second chamber is smaller than a pressure received from the first chamber.