Collective Exhaust System Check Valve Failure Detection
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Solution Overview
Problem
Existing collective exhaust systems cannot detect closing failures of check valves, which can lead to backflow of exhaust into combustion devices, especially during non-combustion states or when clean water and fuel are not available.
Innovation Solution
A collective exhaust system that includes multiple combustion devices, a collective exhaust duct, and check valves, where a backflow determination is performed by stopping one blower fan and driving the others with maximum capacity, allowing detection of check valve closing failures based on temperature, rotation speed, or power changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If combustion is performed to detect check valve closing failure, then detection accuracy is improved, but system safety deteriorates due to risk of backflow
Solution Approach 1:
The system performs a trial run operation before actual combustion to detect check valve closing failures in advance. During this preliminary phase, the blower operates without combustion to check if exhaust flows back through the check valve, thereby detecting closing failures before real combustion begins, avoiding the safety risk while maintaining detection accuracy
Solution Approach 2:
The system skips the combustion phase during the check valve detection process. Instead of performing combustion to detect failures, it rushes through the detection using only the blower operation, thereby avoiding the dangerous backflow risk associated with combustion while still achieving effective detection through the trial run operation
2Reliability
If trial run operation is performed to detect closing failure, then detection capability is improved, but operational complexity increases
Solution Approach 1:
The system merges the check valve detection function with the existing trial run operation that is already part of the startup sequence. By combining these functions, the system achieves detection capability without adding separate complex detection mechanisms, thereby improving reliability while minimizing operational complexity
Solution Approach 2:
The system uses its own existing components (blower, exhaust passage, check valve) to perform the detection function during the trial run operation. The trial run operation itself serves dual purposes: preparing the system for combustion and detecting check valve failures, thereby achieving detection capability without additional operational steps or components
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 system safely detects closing failures of check valves in a non-combustion state, preventing backflow and ensuring safe operation even without clean water and fuel, thereby enhancing system reliability and safety.
Implementation Method 1
a change in a detection temperature of a temperature detection part provided in an air supply and exhaust passage of the combustion device from the blowing part to the exhaust pipe
Implementation Method 2
a detection rotation speed of a rotation speed detection part that detects a rotation speed of the blowing part
Implementation Method 3
a detection power of a power detection part that detects a drive power of the blowing part
Implementation Method 4
an exhaust adapter including a check valve for preventing backflow of exhaust from the collective exhaust duct to the combustion device
Data Source
AI summary
The disclosure provides a collective exhaust system capable of safely detecting a closing failure of a check valve of the collective exhaust system. The collective exhaust system includes: multiple combustion devices including blowing parts and exhaust pipes; a collective exhaust duct to which the exhaust pipes of the multiple combustion devices are respectively connected; and check valves respectively provided between the exhaust pipes and the collective exhaust duct. The collective exhaust system is configured to detect a closing failure of the check valves by performing, in a state where one of the blowing parts of the multiple combustion devices is stopped and all the other blowing parts are driven with a predetermined blower capacity, a backflow determination from the collective exhaust duct to the combustion device with the stopped blowing part, and by performing the backflow determination for the multiple combustion devices.