Exhaust Resistance Plate Venting for Stable Combustion Flow
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Solution Overview
Problem
Conventional combustion apparatuses with exhaust resistance plates experience reduced exhaust flow rates due to water film formation on ventilation ports, leading to unstable hot water supply and increased noise from vibration combustion.
Innovation Solution
The combustion apparatus features an exhaust resistance member with elongated ventilation ports that extend in the flow direction, preventing water film formation by allowing drain to spread along the port edges, thus maintaining a stable exhaust flow rate and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If an exhaust resistance plate with small circular ventilation ports is provided to regulate exhaust flow rate, then combustion noise is reduced and combustion balance is stabilized, but drain forms a water film on the ventilation ports closing them, reducing exhaust flow rate and hot water supply performance
Solution Approach 1:
The ventilation ports are designed with different shapes in different regions. Specifically, at least one ventilation port has an elongated hole shape extending in the flow direction of combustion exhaust gas, while other ports may maintain circular shapes. This local differentiation allows the elongated ports to resist water film formation while circular ports maintain combustion stability, resolving the contradiction between noise reduction and exhaust flow rate maintenance.
2Stability of the object's composition
If an exhaust resistance plate with small circular ventilation ports is provided to regulate exhaust flow rate, then combustion balance is stabilized, but drain is retained at circumferential edges of the circular ventilation ports due to surface tension, closing the ports and reducing burner input
Solution Approach 1:
The invention applies different geometric properties to different ventilation ports. The elongated hole shape at least in one port prevents capillary action and surface tension from retaining drain, ensuring the port remains open. This local structural modification maintains combustion balance through proper exhaust regulation while preventing the reliability issue of port closure by water film formation.
3Object-generated harmful factors
If the exhaust resistance plate is provided beneath the heat exchanger to regulate exhaust flow, then combustion noise is reduced, but the plate is exposed to drain generated on the heat exchanger surface, causing water film formation on ventilation ports
Solution Approach 1:
The ventilation ports are designed with different shapes in different regions. Specifically, at least one ventilation port has an elongated hole shape extending in the flow direction of combustion exhaust gas, while other ports may maintain circular shapes. This local differentiation allows the elongated ports to resist water film formation while circular ports maintain combustion stability, resolving the contradiction between noise reduction and exhaust flow rate maintenance.
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 configuration prevents input reduction to the burner, stabilizes hot water supply performance, and reduces combustion noise by regulating exhaust flow and maintaining combustion balance.
Implementation Method 1
the drain is likely to be retained at circumferential edges of the circular ventilation ports due to surface tension
Implementation Method 2
a heat exchanger for recovering heat in the combustion exhaust gas to heat a heat medium
Implementation Method 3
a burner for combusting fuel gas to generate combustion exhaust gas
Data Source
AI summary
A combustion apparatus includes a burner (11), a heat exchanger (12) accommodated in a casing (20), an exhaust passage (22B) provided to one side surface side of the casing (20), and an exhaust resistance member (5) having a plurality of ventilation ports (50) through which combustion exhaust gas passes, wherein at least one part of the ventilation ports (50) has an elongated hole shape extending in the flow direction of the combustion exhaust gas from beneath the casing (20) to the exhaust passage (22B).