Shutter structure
Solution Overview
Problem
Conventional shutter structures face issues with increased ventilation resistance and external wind inflow due to the design of shield walls and gaps between the shutter plate and duct line, which also require higher fan and motor output to maintain airflow.
Innovation Solution
A shutter structure with a rotary shaft and shutter plate that includes upper and lower ribs on the duct line's inner wall, where the shutter plate has a curved shape with a peripheral edge and shielding plates, allowing the ribs to minimize ventilation resistance when open and effectively prevent reverse airflow when closed by contacting the ribs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shutter plate has a cross-sectional shape bulged to the downstream side to close the duct line against external wind, then the duct line can be effectively closed, but the gap between the periphery of the shutter plate and duct line increases, allowing external wind to flow into the blower module and indoor room
Solution Approach 1:
The shutter plate is divided into multiple functional regions: a closure region that contacts the duct line inner wall to seal the gap, and a bulged region that extends toward the downstream side to maintain closure effectiveness. This segmentation allows different parts of the shutter plate to perform different functions simultaneously, preventing external wind inflow while maintaining reliable closure.
2Reliability
If shield walls are provided on the duct line side to prevent rotation of the shutter plate due to external wind, then rotation can be prevented, but ventilation resistance increases, requiring higher fan and motor output
Solution Approach 1:
The shield walls are extracted from the duct line side and repositioned to the outer periphery of the shutter plate. This allows the shield walls to prevent rotation due to external wind without being present in the airflow path, thereby maintaining shutter plate stability while avoiding increased ventilation resistance.
Solution Approach 2:
The shield walls are positioned in a different spatial dimension - on the outer periphery of the shutter plate rather than on the duct line side. This dimensional relocation allows the shield walls to perform their stabilizing function without interfering with the airflow through the duct line, thus preventing rotation without increasing ventilation resistance.
3Loss of energy
If the shutter plate is designed with a cross-sectional shape smoothly formed by circular arcs to guide fluid flow, then ventilation resistance and noise are reduced, but the ability to effectively close against external wind is compromised
Solution Approach 1:
The shutter plate is designed with different cross-sectional shapes in different regions: the closure region has a cross-sectional shape that smoothly contacts the duct line inner wall to reduce ventilation resistance and noise, while the bulged region extends toward the downstream side to enhance closure effectiveness against external wind. This local differentiation allows both airflow efficiency and reliable closure to be achieved simultaneously.
Data Source
AI summary
A shutter structure includes a rotary shaft, a shutter plate, an upper rib and at least one lower rib. The rotary shaft is provided in a cylindrical duct line. The shutter plate rotates about the rotary shaft and switches between an open state and a closed state. The shutter plate has a peripheral edge portion, a curved portion, and a shutter plate shaft portion. The peripheral edge portion includes an upper shielding plate and two lower shielding plates. The lower shielding plates are located symmetrically to each other with respect to a center line. The center line is perpendicular to the shutter plate shaft portion. When the shutter plate is in the closed state, the upper shielding plate comes into contact with the upper rib from an upstream side, and the lower shielding plates come into contact with the at least one lower rib from a downstream side.