Back Flange Guide for Combustion Exhaust Heat Transfer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing combustion apparatuses face challenges in effectively and rapidly activating overheating prevention devices due to the wide spaces between the outer and inner casings, which hinder the spread of leaking combustion exhaust and its heat to the thermal fuses, leading to inefficient overheating prevention.
Innovation Solution
The combustion apparatus incorporates a first flange with a through hole near the overheating prevention device, partitioning the interspace region between the inner and outer casings into upper and lower portions, directing leaking combustion exhaust through the hole to ensure effective heat transfer and rapid operation of the thermal fuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal fuses are installed in the interspace region between outer and inner casings, then overheating prevention function is provided, but the wide space prevents effective heat transfer from leaking combustion exhaust to the thermal fuses
Solution Approach 1:
A guide member (baffle) is introduced as an intermediary component in the interspace region. This guide member directs the flow of leaking combustion exhaust toward the thermal fuses, ensuring that the heat from the exhaust effectively reaches the thermal fuses despite the wide spacing between casings. The guide member acts as a mediator that bridges the gap between the heat source and the overheating prevention device.
Solution Approach 2:
The interspace region is segmented into multiple zones using the guide member, creating a structured flow path. The space is divided such that the exhaust flow is channeled through specific regions, ensuring systematic heat distribution to thermal fuses positioned at different locations. This segmentation prevents random spreading of exhaust and ensures targeted heat transfer.
2Ease of manufacture
If thermal fuses are positioned far from the inner casing, then installation space is available, but heat transfer from leaking combustion exhaust becomes inefficient
Solution Approach 1:
The guide member serves as a thermal intermediary, extending the reach of heat transfer from the inner casing area toward the outer casing. It conducts and redirects thermal energy from the combustion exhaust, ensuring that even thermal fuses positioned farther away receive sufficient heat for effective operation.
Solution Approach 2:
The guide member extends in the vertical direction, creating a three-dimensional heat transfer path. By utilizing the vertical dimension, the system achieves effective heat transfer over longer distances, allowing thermal fuses to be positioned optimally for both heat reception and installation accessibility.
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 enables the overheating prevention devices to operate definitively and quickly, preventing overheating by ensuring effective heat transfer from leaking combustion exhaust, even when the apparatus is installed on its side, thus protecting the surrounding installation walls from excessive heat.
Implementation Method 1
heat of a prescribed temperature or higher impinges thereon
Implementation Method 2
hot air in the aforementioned rear space to be guided so as to flow toward central through hole(s)
Data Source
AI summary
Spread of leaking combustion exhaust or the like is suppressed and a thermal fuse is made to operate in definitive fashion. A back flange is made to protrude so as to be directed toward a rear wall of an outer casing from a joint between a combustor casing and a heat exchanger casing to a location in the vicinity of the rear wall. A thermal fuse is arranged about the periphery of the heat exchanger casing so as to extend along a region near a protruding end edge of the back flange. The back flange is provided with a through hole, and combustion exhaust which leaks from the combustor casing is guided to the thermal fuse. A back flange which is similar thereto is installed at an upper location so as to straddle a tubing elbow. The two flanges are made to protrude beyond the tubing elbow.