Combustion apparatus and hot water apparatus provided with same
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Solution Overview
Problem
Existing combustion apparatuses face challenges in accurately detecting backfires due to false detection of normal combustion flames and the risk of thermal damage to detection components, especially when using hydrogen as fuel which has a faster combustion rate.
Innovation Solution
The combustion apparatus incorporates a flame sensor positioned within the mixed gas supply channel or facing it, and a shielding part that prevents backfire flames and normal combustion light from reaching the sensor, ensuring accurate backfire detection without thermal damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light amount detection means is provided to detect backfire, then backfire detection capability is improved, but false detection of normal combustion flame occurs
Solution Approach 1:
A shielding part is introduced as an intermediary element between the combustion part and the flame sensor. This shielding part selectively blocks light from normal combustion while allowing detection of backfire flames, thereby resolving the contradiction between detecting backfire and avoiding false detection of normal combustion.
Solution Approach 2:
The detection space is segmented into different zones: a combustion part where fuel burns normally, a shielding part that filters light, and a detection zone where the flame sensor operates. This spatial segmentation allows the system to distinguish between normal combustion light and backfire flame light.
2Measurement precision
If the flame sensor is positioned to detect backfire, then detection capability is improved, but thermal damage from backfire flame occurs
Solution Approach 1:
The shielding part serves as a protective intermediary that blocks the harmful thermal and luminous effects of backfire flames from reaching the flame sensor, while still enabling optical detection of the backfire event through controlled light transmission paths.
Solution Approach 2:
The system detects the presence and characteristics of the backfire flame through its light emission properties without requiring direct physical contact or exposure of the sensor to the flame itself, creating an optical copy or representation of the flame's presence.
3Object-generated harmful factors
If hydrogen is used as fuel gas to achieve low-carbon society, then environmental performance is improved, but backfire occurrence probability increases
Solution Approach 1:
The patent replaces conventional detection methods with an optical detection system using a flame sensor that detects the specific light emission characteristics of hydrogen combustion, enabling reliable backfire detection despite hydrogen's faster combustion rate and higher backfire probability.
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 effectively eliminates false backfire detection, improves the accuracy of backfire detection, and prevents thermal damage to the flame sensor, reducing maintenance burdens.
Implementation Method 1
a flame sensor, provided in a position within the mixed gas supply channel or facing the mixed gas supply channel and being able to, in the event of a backfire from the combustion part to the mixed gas supply channel, optically detect a flame of the backfire
Data Source
AI summary
A combustion apparatus comprising includes: a combustion part for combusting fuel gas; a mixed gas supply channel for supplying a mixed gas of fuel gas and air to the combustion part; and a flame sensor located in or facing the mixed gas supply channel and capable of optically detecting a flame of a backfire from the combustion part to the mixed gas supply channel in the event of the backfire. The combustion apparatus further includes a shielding part that prevents travel of the light of the flame during normal combustion and the backfired flame of the backfire from the combustion part to the flame sensor.