Burner Flame Detection via Segmented Frame and Protrusion
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Solution Overview
Problem
Conventional burners face challenges in accurately detecting flames due to the distance required between the flame rod and metal-fiber knit, leading to misjudgments during weak combustion when the flame length shortens.
Innovation Solution
The burner design includes a combustion plate with a picture frame structure, metal-fiber knit, and distribution plate, with flame holes in the burner frame allowing the flame rod to be positioned closer without contacting frayed fibers, and an extension portion of the flame rod to ensure accurate flame detection across varying combustion conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flame rod is disposed at a certain distance from the metal-fiber knit to prevent fiber contact, then the reliability of flame detection is improved, but the measurement precision deteriorates because the flame may not contact the flame rod during weak combustion
Solution Approach 1:
The burner frame is segmented to include a protruded part that extends into the opening, creating a separate flame ejection zone. This segmentation allows the flame rod to be positioned closer to the combustion plate part without contacting the metal-fiber knit, as the protruded part creates a spatial separation. The flame holes are formed in the protruded part, creating a distinct region for flame ejection that is closer to the flame rod while maintaining safety distance from the knit.
Solution Approach 2:
The protruded part of the burner frame acts as an intermediary structure between the metal-fiber knit and the flame rod. It provides a platform for forming flame holes closer to the flame rod while preventing direct contact between the knit and flame rod. The protruded part mediates the spatial relationship, allowing optimized flame detection geometry without compromising safety.
2Measurement precision
If the flame rod is positioned closer to the combustion plate part, then the flame detection accuracy is improved, but the risk of fiber contact with the flame rod increases
Solution Approach 1:
The burner frame is divided into a main body and a protruded part. The protruded part extends into the opening and houses the flame holes, creating a segmented structure that separates the flame ejection zone from the metal-fiber knit. This segmentation enables the flame rod to be positioned closer to the combustion plate while the protruded part maintains a safety buffer, preventing fiber contact with the flame rod.
Solution Approach 2:
The protruded part serves as an intermediary barrier between the metal-fiber knit and the flame rod. It allows the flame holes to be positioned in a location that enables accurate flame detection by the flame rod, while simultaneously preventing the knit from contacting the flame rod. The protruded part mediates the close proximity arrangement, making it safe and effective.
3Temperature
If the entire burner frame is made of heat-resistant material, then the heat resistance is improved, but the manufacturing cost increases
Solution Approach 1:
Instead of making the entire burner frame from heat-resistant material, only the protruded part that is exposed to high temperatures and requires heat resistance is made from heat-resistant material. The rest of the burner frame can be made from less expensive materials. This local application of heat-resistant material optimizes thermal performance while reducing manufacturing costs by avoiding unnecessary use of expensive materials in non-critical areas.
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 enhances flame detection accuracy by ensuring the flame consistently contacts the flame rod, even during weak combustion, while preventing fiber contact and allowing for cost-effective heat-resistant material use in critical areas.
Implementation Method 1
a metal-fiber knit which covers an opening enclosed by the burner frame; and a distribution plate which has formed therein a multiplicity of distribution holes and which sandwiches the metal-fiber knit between the burner frame and the distribution plate so that the air-fuel mixture is ejected from the opening through the distribution holes and the metal-fiber knit
Implementation Method 2
a flame rod which lies opposite to a portion of the combustion plate part... the flame rod is disposed so as to lie opposite to that portion of the burner frame which has formed therein the flame holes
Data Source
AI summary
A burner has: a combustion plate part through which air-fuel mixture is ejected; and a flame rod which lies opposite to a portion of the combustion plate part. The combustion plate part is constituted by: a burner frame in a shape of a picture frame; a metal-fiber knit which covers an opening enclosed by the burner frame; and a distribution plate which has formed therein a multiplicity of distribution holes and which sandwiches the metal-fiber knit between the burner frame and the distribution plate so that the air-fuel mixture is ejected from the opening through the distribution holes and the metal-fiber knit. Flame holes for ejecting the air-fuel mixture are formed in a portion of the burner frame, and the flame rod is disposed so as to lie opposite to that portion of the burner frame which has formed therein the flame holes.