Blower Control for Combustion Device Check Valve Noise
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Solution Overview
Problem
Existing combustion devices with check valves connected to a common exhaust duct experience abrupt noise during air purge due to rapid opening of the check valve, which can lead to reverse flow of exhaust into non-combusting units.
Innovation Solution
Implementing a slow-start air purge control method for the blower unit, where the time interval from the start of air purge to reaching the predetermined air blowing amount is extended, reducing the rapid opening of the check valve and preventing collision noise between the valve element and stopper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the blower fan is driven at high acceleration to reach rated rotational speed quickly during air purge, then the air purge efficiency is improved, but the check valve opens abruptly causing collision noise
Solution Approach 1:
The patent applies periodic action by dividing the air purge process into two distinct phases: a first air purge phase with high acceleration for efficiency, and a second air purge phase with reduced acceleration to prevent valve collision. This temporal segmentation allows the system to achieve both high productivity during the first phase and noise reduction during the second phase.
Solution Approach 2:
The patent implements dynamics by dynamically adjusting the blower fan's rotational acceleration based on the operational phase. The control unit changes the acceleration characteristics from high to reduced levels, allowing the check valve to open gradually rather than abruptly, thereby preventing collision noise while maintaining overall air purge effectiveness.
2Productivity
If the check valve opens rapidly to discharge combustion exhaust quickly, then the exhaust discharge efficiency is improved, but the valve plate collides with the stopper generating unpleasant noise
Solution Approach 1:
The patent applies periodic action by dividing the air purge process into two distinct phases: a first air purge phase with high acceleration for efficiency, and a second air purge phase with reduced acceleration to prevent valve collision. This temporal segmentation allows the system to achieve both high productivity during the first phase and noise reduction during the second phase.
Solution Approach 2:
The patent implements dynamics by dynamically adjusting the blower fan's rotational acceleration based on the operational phase. The control unit changes the acceleration characteristics from high to reduced levels, allowing the check valve to open gradually rather than abruptly, thereby preventing collision noise while maintaining overall air purge effectiveness.
3Loss of time
If the blower fan reaches rated rotational speed in a short time interval, then the response time is reduced, but the check valve experiences abrupt opening and collision
Solution Approach 1:
The patent applies periodic action by dividing the air purge process into two distinct phases: a first air purge phase with high acceleration for efficiency, and a second air purge phase with reduced acceleration to prevent valve collision. This temporal segmentation allows the system to achieve both high productivity during the first phase and noise reduction during the second phase.
Solution Approach 2:
The patent implements dynamics by dynamically adjusting the blower fan's rotational acceleration based on the operational phase. The control unit changes the acceleration characteristics from high to reduced levels, allowing the check valve to open gradually rather than abruptly, thereby preventing collision noise while maintaining overall air purge effectiveness.
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 slow-start air purge effectively suppresses the generation of discordant noise by controlling the blower unit to increase air blowing rate gradually, preventing abrupt valve opening and ensuring reliable operation of check valves during air purge.
Implementation Method 1
a blower unit for supplying air for combustion
Implementation Method 2
a check valve for preventing back flow of exhaust
Data Source
AI summary
The combustion device includes: a burner; an igniter; a fuel supply unit that supplies fuel to the burner; a blower fan that supplies air for combustion; an exhaust port that discharges combustion exhaust; a device control unit that, before ignition of fuel supplied to the burner by operation of the igniter, performs air purge of the burner at a predetermined air blowing amount by driving the blower fan; and a setting means that is set when a check valve for preventing back flow of exhaust is connected to the exhaust port. When the setting means is set to indicate that the check valve is connected, the device control unit controls the operation of the blower fan so that slow-start air purge is performed in which the time interval from the start of air purge until the predetermined air blowing amount is reached becomes longer, than in the case in which no such check valve is connected.