Damper Switch Load Detection to Prevent Motor Overload and Leakage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional smoke exhaust dampers suffer from leakage gaps due to structural defects, leading to poor airtightness and inefficient smoke removal during fires, affecting both smoke exhaust and air conditioning systems.
Innovation Solution
A damper switch with a rotating part, driving part, and controller that measures load and interrupts power when excessive, combined with optical sensors and a clamp to ensure blades are fully closed, minimizing leakage and preventing motor overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the blades are closed to maintain airtightness, then smoke leakage is reduced, but the blades do not close accurately due to structural clearance, causing leakage gaps
Solution Approach 1:
A seal member is introduced as an intermediary element between the blades to compensate for structural clearance. The seal member fills the gap between adjacent blades when they are closed, preventing smoke leakage without requiring the blades themselves to achieve perfect alignment.
Solution Approach 2:
The system changes the state of the seal member from a flexible, deformable state during blade closing to a sealed state that fills the clearance gap. The seal member's ability to deform and conform to the blade surfaces allows it to adapt to manufacturing tolerances and maintain airtightness.
2Reliability
If the damper switch forces the blades to close completely, then airtightness is improved, but the motor may overload due to excessive load
Solution Approach 1:
A load detection mechanism provides feedback to the controller about the current load on the motor. When the load exceeds a predetermined threshold, the controller interrupts power supply to the motor, preventing overload damage while still allowing the blades to close to the extent possible without causing mechanical failure.
Solution Approach 2:
Instead of forcing complete blade closure regardless of load conditions, the system applies partial action by interrupting power supply when load becomes excessive. This allows the blades to close as much as the motor can handle without overloading, accepting a small compromise in airtightness to prevent motor damage.
3Ease of manufacture
If the blades are kept in a fixed closed state, then installation is simple, but leakage gaps of 3-5% are formed due to mechanical clearance
Solution Approach 1:
The seal member serves as an intermediary that compensates for the mechanical clearance inherent in fixed blade structures. It is easily installed between the blades and automatically fills the clearance gaps, maintaining airtightness without complicating the overall installation process.
Data Source
AI summary
Disclosed are a damper switch mounted on a damper having a blade opening/closing structure to open/close blades of the damper, and a damper including the same. The damper switch configured to open/close a plurality of blades of a damper according to the present invention includes a rotating part mounted on a damper shaft of the damper and rotated together with the damper shaft, a driving part configured to provide a power for rotating the rotating part, and a controller configured to measure a load applied to the driving part when the blades are closed, and interrupt an electric power supplied to the driving part when the measured load is not less than a predetermined value.