TDR Damper With Separate Gas-Air Passages for Stable Low-Load Combustion
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Solution Overview
Problem
Existing burners, particularly gas boilers and water heaters, face challenges in achieving a high Turn Down Ratio (TDR) due to inefficient gas and air delivery, leading to increased temperature deviations and reduced durability when operating at low loads.
Innovation Solution
A TDR damper with separate air and gas passages and opening/closing mechanisms ensures efficient delivery of gas and air to a turbo fan, allowing for independent control and mixing of air and gas flows to optimize combustion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If air and gas are delivered through mixed paths in existing burners, then the structure is simpler, but gas flow is blocked by air and combustion efficiency deteriorates
Solution Approach 1:
The patent divides the delivery system into separate air passages and gas passages, with air passages including a first air passage and second air passage, and gas passages including a first gas passage and second gas passage. This segmentation prevents air from blocking gas flow while maintaining structured organization, directly resolving the contradiction between structural simplicity and gas flow stability.
2Device complexity
If the burner operates at high minimum gas consumption (low TDR), then the structure is simpler, but temperature control precision deteriorates and durability decreases
Solution Approach 1:
The patent introduces opening and closing means that can dynamically adjust the second air passage and second gas passage based on operational requirements. This dynamic capability enables precise control of gas consumption across a wide range (TDR of 5:1 or higher), improving temperature control precision without excessive structural complexity.
3Ease of manufacture
If air flows horizontally above gas in vertical direction, then the passage design is simpler, but gas inflow is prevented and delivery efficiency deteriorates
Solution Approach 1:
The patent reconfigures the flow paths so that air passages and gas passages extend in different spatial dimensions and directions, with outlets connected to the turbo fan in coordinated orientations. This dimensional separation ensures both air and gas reach the turbo fan efficiently without mutual interference, resolving the contradiction between passage design simplicity and delivery efficiency.
Data Source
AI summary
A turn down ratio (TDR) damper which controls an amount of gas and air flowing in the TDR damper and deliver the controlled gas and air to a turbo fan is disclosed. The TDR damper includes: air passages comprising a first air passage and a second air passage, the first air passage and the second air passage separately formed so that the air move through each path; gas passages comprising a first gas passage and a second gas passage, the first gas passage and the second gas passage separately formed so that the gas move through each path; and opening and closing means for opening and closing the second air passage and the second gas passage at the same time. The air passages and the gas passages may be separately formed and reached outlets connected to the turbo fan so that the air and gas may be delivered to the turbo fan through a separate path.