Ventilation Shutter Rib Structure for Low Air Passage Resistance
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Solution Overview
Problem
Conventional shutter devices in ventilation systems increase air passage resistance, leading to higher loads on fans and motors due to the rib's inward protrusion, which obstructs airflow when the shutter is open.
Innovation Solution
A shutter device design with a shutter mount having a larger inner diameter than the discharging port, featuring a shutter frame with a rib that contacts the shutter to seal gaps when closed, but does not obstruct airflow when open, and includes curved portions and asymmetrical edges to enhance air passage area and reduce resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rib protrudes inward towards the air passage to seal the gap between the shutter and adapter, then air-tightness is improved, but resistance in the air passage increases
Solution Approach 1:
The rib is divided into multiple segments (first rib, second rib, third rib) positioned at different locations. The first rib seals the gap between the shutter and adapter inner side, the second rib seals the gap between the shutter and shutter mount, and the third rib seals the gap between the shutter and discharging port. This segmentation allows effective sealing without requiring a single large protruding rib that would obstruct airflow.
Solution Approach 2:
Different portions of the rib structure have different functions and dimensions optimized for their specific locations. The first rib portion contacts the shutter at the adapter interface, the second rib portion contacts at the shutter mount interface, and the third rib portion contacts at the discharging port interface. Each portion is sized and positioned to provide localized sealing without unnecessary protrusion into the air passage.
2Reliability
If the rib protrudes inward to ensure air-tightness when shutter is closed, then sealing performance is improved, but the load to fan and motor increases
Solution Approach 1:
The sealing function is distributed across multiple rib segments positioned at different interfaces (adapter-shutter, shutter mount-shutter, discharging port-shutter). This allows effective sealing to be achieved with smaller, less obstructive rib portions compared to a single large protruding rib, thereby reducing air passage resistance and the power load on fans and motors.
Solution Approach 2:
The shutter frame acts as an intermediary structure that provides multiple sealing surfaces through its rib portions at different locations. This intermediary structure enables effective sealing without requiring the adapter or other components to have large protruding sealing elements that would obstruct airflow and increase power consumption.
Data Source
AI summary
A shutter device reduces resistance in an air passage while maintaining air-tightness, thus reducing a load to a fan and a motor. A shutter mount is provided between an intake port adapted to be connected with a side from which air enters and a discharging port adapted to be connected with a side from which air is discharged. A shutter frame is inserted into an inside of the shutter mount. A shutter for preventing outside air from entering from the discharging port is mounted to the shutter frame. The shutter mount has a rib thereof for sealing a gap produced between the shutter and the shutter mount when the shutter is closed. The rib has an inner diameter substantially equal to a diameter of the discharging port as seen from the discharging port.