Combustion apparatus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The air-fuel mixture in conventional combustion apparatuses tends to flow in a direction component that does not sufficiently distribute to the part of the combustion plate opposite to the tip part of the ignition electrode, leading to deteriorated ignition performance.
Innovation Solution
The combustion apparatus includes an offset part in the opposite wall of the burner body, positioned away from the swelling part in the inflow direction, which reduces the flow resistance and ensures the air-fuel mixture is distributed to the combustion plate opposite to the ignition electrode tip parts, enhancing ignition performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the air-fuel mixture flows in the inflow chamber with a direction component from the side plate with ignition electrode to the opposite side plate, then the flow moves forward in the inflow direction, but the air-fuel mixture is not sufficiently distributed to the combustion plate opposite to the tip part of the ignition electrode
Solution Approach 1:
The opposite wall is designed with different local structures: a swelling part that protrudes toward the combustion plate to create a recirculation zone for better mixture distribution, and an offset part that is offset from the combustion plate to control flow resistance. This local differentiation allows the wall to simultaneously manage flow speed and distribution uniformity in different regions.
Solution Approach 2:
The swelling part extends in the direction toward the combustion plate (perpendicular to the main flow direction), creating a three-dimensional recirculation zone. This dimensional addition allows the air-fuel mixture to be redirected and distributed more uniformly across the combustion plate surface, addressing the distribution issue without simply reducing flow speed.
2Reliability
If the opposite wall is positioned close to the combustion plate, then the flow resistance increases and forward flow is suppressed, but the distance between the opposite wall and combustion plate must be sufficient for proper flow distribution
Solution Approach 1:
The opposite wall features localized protrusions (swelling part and offset part) rather than a uniformly close positioning. The swelling part locally reduces distance to create recirculation, while the offset part maintains appropriate distance to control overall flow resistance. This local differentiation resolves the contradiction between needing close proximity for flow control and maintaining sufficient distance for proper distribution.
Solution Approach 2:
The opposite wall is segmented into different functional regions: the swelling part that creates local recirculation zones for improved distribution, and the offset part that maintains overall flow resistance. This segmentation allows different portions of the wall to serve different functions, simultaneously achieving flow suppression and proper distribution.
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 offset part in the opposite wall of the burner body effectively suppresses the forward flow of the air-fuel mixture, ensuring sufficient distribution to the combustion plate, thereby improving ignition performance even at high supply amounts.
Implementation Method 1
tip part(s) of the ignition electrode(s), at which spark discharge occurs
Implementation Method 2
a flow resistance of a space between the opposite wall of the burner and the combustion plate increases at the offset part that is away from the swelling chamber in the inflow direction of the air-fuel mixture to the inflow chamber
Data Source
AI summary
In a combustion apparatus that includes a burner constituted by a burner body, an inside of which an air-fuel mixture is supplied to and one surface of which is made into an open surface, and a combustion plate covering the open surface of the burner body, and a combustion box enclosing a combustion space of the air-fuel mixture ejecting from the combustion plate, an offset part that is positioned at a portion which is away from the swelling part in an inflow direction of the air-fuel mixture to the inner chamber and does not oppose to a tip part(s) of the ignition electrode(s) through the combustion plate is provided with the opposite wall of the burner body and the offset part offsets to a combustion-plate side so that a distance between the offset part and the combustion plate becomes shorter than that between the combustion plate and a general part of the opposite wall except the swelling part and the offset part.