Burner Mixing Device Sealing with Resin and Drawn-In Edge
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Solution Overview
Problem
The existing mixing devices for burners suffer from air leakage through the parting line of the guide ring, leading to local and asymmetrical temperature fluctuations and soot formation due to high temperature fluctuations, which is not effectively addressed.
Innovation Solution
A mixing device with a constricted edge at the burner tube transition to the flame tube, featuring a cup-shaped base on the separating disk and a drawn-in edge that prevents air leakage, along with additional air passage openings or swirl slots to enhance combustion air supply, reducing hydrocarbon gas concentration and soot formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a metallic guide ring with a parting line is used to seal the separating disk against the burner tube, then the guide ring can be easily assembled and displaced axially, but air leakage occurs through the parting line causing temperature fluctuations and soot formation
Solution Approach 1:
A resin layer is introduced as an intermediary material between the metallic guide ring and the burner tube inner wall. This resin layer fills the gap created by the parting line and prevents air leakage, while still allowing axial displacement of the guide ring. The resin acts as a mediator that maintains both the sealing function and the adjustability of the system.
Solution Approach 2:
The sealing system transitions from a single metallic material to a composite structure combining metal (guide ring) with resin (sealing layer). This composite approach leverages the mechanical strength and displacement capability of metal while utilizing the sealing properties of resin to block air leakage through the parting line.
2Reliability
If the guide ring is made as a single piece, then sealing may be improved, but material stresses from temperature fluctuations cause deformation and sealing failure
Solution Approach 1:
The guide ring is divided into two axial segments with a parting line between them. This segmentation allows each segment to expand and contract independently in response to temperature changes, reducing thermal stress accumulation. The parting line acts as a stress relief zone that prevents deformation while maintaining the overall structural integrity of the guide ring.
3Device complexity
If the separating disk is fixed in position, then sealing is simplified, but the passage cross-section of recirculation openings cannot be adjusted
Solution Approach 1:
The guide ring and separating disk assembly is designed to be axially movable rather than fixed. The resin layer provides continuous sealing during axial displacement, enabling dynamic adjustment of the separating disk position to control the passage cross-section of recirculation openings, while maintaining reliable sealing throughout the adjustment range.
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 solution effectively seals the parting line, minimizes air leakage, reduces soot formation, and improves combustion efficiency by distributing combustion air evenly, thereby reducing metal dusting and enhancing burner performance.
Implementation Method 1
The drawn-in edge covers the parting line and prevents air from flowing through the parting line past the cutting disc and into the flame tube
Implementation Method 2
an air nozzle is arranged coaxially, which extends into the flame tube and leads combustion air out of the burner tube into the flame tube
Implementation Method 3
The separating disk is axially displaceable in the burner tube in order to adjustably change the passage cross-section of recirculation openings through which combustion gases recirculate from the combustion chamber into the flame
Implementation Method 4
If the metal guide ring in which the cutting disc is inserted hits the indented edge of the burner pipe on the burner pipe side, the pot-shaped bottom protrudes out of the burner pipe in the direction of the flame tube, so that the air can flow through the air nozzle in the cutting disc into the flame tube
Data Source
Figure 1
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Figure 5
AI summary
The mixing device (10) is for a burner tube (20) with a flame tube (30) and containing a jet holder (40), and with a separator (50). The separator is axially adjustable in the combustion tube, and is sealed against the combustion tube by a roughly cylindrical metal guide ring which has its outer jacket surface resting against the inner wall of the burner tube and able to move on it.