Premixed Burner Partition Plate for Stable Water Heater Combustion
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Solution Overview
Problem
Existing water heaters of the exhaust suction type face challenges in suppressing oscillating combustion, particularly when burners are reduced in size and low-NOx combustion and high-load combustion are desired, as conventional measures are insufficient in stabilizing the combustion state and preventing noise generation.
Innovation Solution
A water heater design featuring a burner case partitioned into a combustion chamber and a gas introduction chamber with a partition plate having multiple opening portions and through holes, where the air supply opening area is smaller than the total of the opening areas of these features, providing airflow resistance to suppress pressure fluctuations and stabilize combustion, while also incorporating protruding portions to prevent clogging and ensure air flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the burner size is reduced to achieve compact water heater design, then the device size is reduced, but oscillating combustion is more likely to occur
Solution Approach 1:
The partition plate is designed with non-uniform opening areas at different locations. Specifically, the opening areas are arranged such that larger openings are positioned where greater airflow is needed, and smaller openings where less airflow is required, creating local variations in flow characteristics that suppress oscillating combustion while maintaining compact burner dimensions
Solution Approach 2:
The invention changes the geometric parameters of the partition plate openings to control combustion stability. By carefully selecting the opening areas and their distribution pattern on the partition plate, the system modifies the airflow parameters through the combustion tubes to prevent oscillating combustion in the reduced-size burner
2Object-generated harmful factors
If conventional exhaust suction measures are applied to a compact burner, then the exhaust function is provided, but oscillating combustion cannot be sufficiently suppressed
Solution Approach 1:
The partition plate incorporates locally varied opening areas that create different flow resistance characteristics in different regions of the burner. This local differentiation in opening size and distribution patterns the airflow through each combustion tube, preventing the uniform pressure fluctuations that cause oscillating combustion while maintaining effective exhaust suction
Solution Approach 2:
The partition plate acts as an intermediary component between the air supply and combustion tubes. Its non-uniform opening structure mediates the airflow, creating local flow resistance variations that suppress oscillating combustion while still allowing the exhaust suction system to effectively remove combustion gases
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively suppresses oscillating combustion, stabilizes the combustion state, and reduces noise, ensuring reliable operation and efficient heat exchange in water heaters of the exhaust suction type.
Implementation Method 1
the air supply opening has an opening area smaller than a total sum of a total of opening areas of the plurality of opening portions and a total of opening areas of the plurality of through holes. According to such a construction, fluctuation in pressure in the burner case can be suppressed by providing an air flow resistance on an upstream side of the burner
Implementation Method 2
a heat exchanger heating water which flows through the inside, through heat exchange with combustion gas generated in the burner
Implementation Method 3
a fan suctioning combustion gas which has passed through the heat exchanger and exhausting combustion gas to the outside
Implementation Method 4
a burner of a premixed type which generates combustion gas by burning an air fuel mixture in a combustion region
Data Source
AI summary
A water heater includes a burner of a premixed type, a heat exchanger, and a fan suctioning combustion gas and exhausting combustion gas to the outside. The burner includes a burner case partitioned into a combustion chamber and a gas introduction chamber by a partition plate and a plurality of combustion tubes arranged in the combustion chamber. An air supply opening for supplying air into the gas introduction chamber is provided in the burner case. The partition plate has a plurality of opening portions communicating with the inside of the combustion tubes and a plurality of through holes communicating with the outside of the combustion tubes within the combustion chamber. The air supply opening is constructed to have an opening area smaller than the total sum of the total of opening areas of the plurality of opening portions and the total of opening areas of the plurality of through holes.