Rectangular flanged bubble tight damper
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Solution Overview
Problem
Current bubble tight dampers in HVAC systems face issues such as high pressure drop values, complex design leading to expensive manufacturing, heavier construction, and unreliable leakage performance, which hinder efficient airflow and increase costs.
Innovation Solution
A cost-effective damper design featuring a two-piece frame web composed of C-shaped sheet metal components with a double skin damper blade and integral bearing and shaft seal assembly, reducing the number of components and welds, thereby minimizing pressure drop and leakage while allowing easier assembly and stacking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional bubble tight damper design is used, then leakage protection is achieved, but pressure drop increases and manufacturing cost increases
Solution Approach 1:
The damper blade is segmented into multiple sections (typically three) that can rotate independently around a central axis. Each segment is separated by gaps that allow airflow, reducing pressure drop while the seals at segment interfaces maintain bubble-tight leakage protection when closed
Solution Approach 2:
Seals are applied locally at critical interfaces - specifically at the segment gaps of the damper blade and between the blade and frame. This localized sealing approach achieves bubble-tight protection without requiring seals across the entire surface, minimizing pressure drop
2Reliability
If traditional bubble tight damper design is used, then leakage protection is achieved, but design complexity increases and manufacturing cost increases
Solution Approach 1:
Multiple frame webs are merged into a single integrated frame structure that provides support and sealing surfaces. The damper blade segments are combined into a single rotating assembly, reducing the number of separate components and simplifying manufacturing while maintaining bubble-tight performance
3Reliability
If traditional bubble tight damper design is used, then leakage protection is achieved, but construction weight increases
Solution Approach 1:
The segmented damper blade design allows each section to be lighter than a solid blade, reducing overall weight while maintaining structural integrity and sealing capability through the segmented construction with gaps for airflow
4Ease of manufacture
If fewer parts are used, then manufacturing cost decreases and assembly time decreases, but leakage protection may be compromised
Solution Approach 1:
The frame webs are merged into an integrated structure that provides multiple sealing surfaces and structural support in a single component, reducing part count while maintaining or enhancing leakage protection through the combined sealing capability
Data Source
AI summary
The present disclosure provides a damper used in heating, ventilation, and air conditioning (HVAC) systems. In an aspect, the damper may include a frame composed of at least two attached frame webs, each frame web comprising a C-shaped component. The damper may further include a damper blade removably attached to each compartment formed by the frame webs.