Rich-lean Combustion Burner Sealability via V-shaped Plate Partitioning
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Solution Overview
Problem
The challenge in forming a rich-lean combustion burner with a flat shape is maintaining sealability between the lean-side and rich-side mixture supply channels, as variations in plate member dimensions can lead to instability and leakage, causing unintended mixing of mixtures and compromising combustion state.
Innovation Solution
The burner design features a central plate member with opposing surfaces and slit parts on the outer plate member, allowing for elastic resilience to maintain close contact and prevent mixing, with additional convex ribs and sloping projections to ensure precise alignment and sealability even with process variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If thin plate members are joined or welded together to form a flat-shaped rich-lean combustion burner, then the overall shape and structure are improved, but sealability between supply channels deteriorates due to clearance gaps and dimensional variations
Solution Approach 1:
The burner is divided into multiple thin plate members (first plate member, second plate member, third plate member) that are joined together to form the flat-shaped structure. Each plate member is separately formed and then assembled, allowing the overall shape to be achieved while maintaining control over individual component dimensions and sealability features.
Solution Approach 2:
The third plate member is pre-formed with a bent shape that creates a protruding portion before assembly. This preliminary forming action ensures that when the plate members are joined, the protruding portion can extend into the lean-side mixture supply channel to prevent leakage, thereby maintaining sealability without compromising the flat overall shape.
2Ease of manufacture
If dimensional variations occur in plate members during manufacture, then manufacturing flexibility is improved, but positional stability and sealability deteriorate
Solution Approach 1:
The third plate member is formed with a bent shape that creates a protruding portion with specific dimensional characteristics. This parameter change in the plate member's geometry allows it to compensate for dimensional variations during assembly, maintaining stable longitudinal positioning and sealability despite manufacturing tolerances in the individual plate members.
3Reliability
If close-contact portions are brought into contact to ensure sealability, then leakage is prevented, but assembly stability deteriorates due to clearance gaps
Solution Approach 1:
The third plate member is pre-formed with a bent shape creating a protruding portion that extends into the lean-side mixture supply channel. This preliminary action ensures that when the plate members are assembled, the protruding portion provides stable positioning and maintains sealability by preventing clearance gaps, thereby achieving both assembly stability and leakage prevention.
Solution Approach 2:
The protruding portion of the third plate member acts as an intermediary element between the plate members. It extends into the lean-side mixture supply channel to prevent leakage while also providing stable positioning, thereby mediating between the requirements for sealability and assembly stability.
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
This design effectively partitions the supply channels, preventing mixing between the rich-side and lean-side mixtures and maintaining high sealability, ensuring stable combustion by ensuring the intended separation of mixture flows.
Implementation Method 1
allowing for elastic resilience to maintain close contact and prevent mixing
Data Source
AI summary
A rich-lean combustion burner has a supply channel through which a lean-side mixture is supplied to lean-side flame holes; and a supply channel through which a rich-side mixture is supplied to rich-side flame holes. The supply channels are partitioned from each other. A third plate member including a pair of plate parts which are bent to form a V shape at its lower end edge as a fold line is employed to form a central rich-side burner part. A slit part is partitioned and formed between side edges of a pair of first plate members on both longitudinal sides for forming lean-side flame holes on width-wise sides of the central rich-side burner part. With the lower end part in front, the V-shaped third plate member s inserted into the slit part, thereby being interposed between the first plate members.