Combustion Apparatus
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Solution Overview
Problem
In conventional combustion apparatuses, air bubbles generated by local overheating in the heat exchanger can accumulate in the fourth jacket part, leading to increased temperatures and scale formation, which deteriorates the durability of the cooling system.
Innovation Solution
The fourth jacket part is designed with its sectional center positioned below the hot water outlet port, promoting natural convection and preventing air bubbles from accumulating, and its upper surface is inclined to facilitate the flow of air bubbles towards the outlet, ensuring they are carried away from the cooling area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the fourth jacket part is elongated horizontally from the outlet-side jacket part, then the cooling area is increased, but air bubbles accumulate in the fourth jacket part causing temperature increase and scale formation
Solution Approach 1:
The fourth jacket part is designed with asymmetric positioning where its sectional center is located below the hot water outlet port rather than at the same level. This asymmetric arrangement creates a downward slope that prevents air bubble accumulation while maintaining the extended cooling surface area, thus resolving the contradiction between increasing cooling area and maintaining system reliability
Solution Approach 2:
The fourth jacket part extends in the longitudinal dimension from the outlet-side jacket part toward the inlet-side, rather than only in the lateral direction. This dimensional extension increases the cooling surface area while the downward slope design ensures air bubbles are directed toward the outlet, preventing accumulation and maintaining durability
2Device complexity
If the sectional center of the fourth jacket part is positioned at the same height as the hot water outlet port, then the structure is simplified, but air bubbles get accumulated causing temperature increase and scale formation
Solution Approach 1:
The design intentionally creates asymmetric positioning by locating the sectional center of the fourth jacket part below the hot water outlet port. This asymmetric configuration introduces a downward slope that actively directs air bubbles toward the outlet, eliminating air bubble accumulation without significantly increasing structural complexity
Solution Approach 2:
Instead of positioning the fourth jacket part at the same level as the outlet port (conventional approach), the design inverts the arrangement by positioning it below the outlet port. This inversion creates a gravitational flow path for air bubbles toward the outlet, effectively eliminating the harmful accumulation effect
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 prevents air bubbles from accumulating in the fourth jacket part, thereby maintaining the durability of the cooling system by preventing scale formation due to temperature rises.
Implementation Method 1
a water jacket as a cooling means for cooling the combustion box is disposed in that portion of the combustion box which lies between the burner and the heat exchanger
Implementation Method 2
the water passed through the heat exchanger flows from the inlet-side jacket part through the first jacket part, the second jacket part, and the third jacket part
Implementation Method 3
a heat exchanger disposed in a lower part inside the combustion box
Implementation Method 4
the water passed through the heat exchanger flows from the inlet-side jacket part
Implementation Method 5
The fourth jacket part is disposed so as to be elongated in one of the front-side and rear-side from an upper part of the outlet-side jacket part toward a position close to the inlet-side jacket part, and a sectional center of a tip closer to the inlet-side jacket part is positioned below a sectional center of the hot-water outlet port
Data Source
AI summary
In a combustion apparatus including a burner, a combustion box on a lower side of the burner and enclosing a heat exchanger, and a water jacket in the combustion box and connected to a downstream side of the heat exchanger, the water jacket is arranged to connect together an inlet jacket part disposed in one lateral-side side plate of the combustion box, and an outlet jacket part having a hot water outlet port through jacket parts disposed in the other side plates of the combustion box. An extension jacket part is disposed so as to be elongated from an upper part of the outlet jacket part toward the inlet jacket part and formed such that a sectional center of a tip is positioned below a sectional center of the hot water outlet port.