Pressure Propagation Delay Means for Combustion Control
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Solution Overview
Problem
Conventional combustion control devices face challenges in maintaining continuous combustion due to rapid pressure increases at ignition, which cause the pressure sensor to malfunction and lead to burner clogging.
Innovation Solution
A combustion control device with a pressure propagation delay mechanism, such as an orifice or pressure adjustment valve, is introduced along the pressure passage to reduce the transmission of temporary pressure increases to the pressure sensor, preventing it from being operated during rapid pressure changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure sensor is connected to the mixer through a pressure passage to monitor pressure, then the pressure can be detected, but when the pressure within the mixer is rapidly increased at ignition, the pressure sensor is operated and combustion cannot continue
Solution Approach 1:
A pressure propagation delay means is introduced as an intermediary component in the pressure passage between the mixer and pressure sensor. This mediator delays the transmission of pressure waves, preventing the pressure sensor from detecting rapid pressure increases during ignition while still allowing it to monitor steady-state pressure conditions for combustion continuity.
Solution Approach 2:
The pressure propagation delay means is pre-configured in the pressure passage to anticipatorily attenuate pressure waves before they reach the pressure sensor. This preliminary action ensures that when ignition occurs and rapid pressure increases happen, the sensor is protected from false operation before the pressure wave can affect it.
2Productivity
If the pressure within the combustion chamber is rapidly increased at ignition, then combustion is initiated, but the burner portion becomes completely clogged and combustion cannot continue
Solution Approach 1:
The pressure propagation delay means acts as a buffer between the combustion chamber and the mixer, allowing rapid pressure increases during ignition to occur without transmitting these pressure spikes to the burner. This intermediary protection prevents burner clogging while maintaining the ability to initiate combustion.
3Reliability
If a pressure propagation delay means is provided partway along the pressure passage, then the transmission of temporary pressure increase to the pressure sensor is reduced, but the device complexity increases
Solution Approach 1:
The pressure propagation delay means is implemented using simple, inexpensive components such as restrictors, capillary tubes, or small orifices that can be easily manufactured and integrated into the existing pressure passage. These simple components provide the necessary pressure delay function without requiring complex mechanical structures or expensive materials.
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 solution allows the pressure sensor to remain in a non-operated state, enabling continuous combustion by mitigating the effects of rapid pressure increases within the mixer, while maintaining a simple and cost-effective configuration.
Implementation Method 1
a pressure propagation delay means which reduces transmission to the pressure sensor caused by a temporary pressure increase within the mixer is provided partway along the pressure passage
Data Source
AI summary
An object of the present invention is to realize a combustion control device that reduces, when a pressure within a mixer is rapidly increased at the time of ignition of the combustion control device, the transmission of the temporarily increased pressure to a pressure sensor, that brings the pressure sensor into a non-operated state and that thereby can continue combustion in the combustion control device. Hence, a combustion control device is provided that includes: a combustion chamber which has a heat dissipation disc on a front surface and within which a combustion room is formed; a burner which is attached to the combustion chamber; a mixer which mixes a gas supplied to the burner with air; and a pressure sensor which is connected to the mixer through a pressure passage, where a pressure propagation delay means which reduces transmission to the pressure sensor caused by a temporary pressure increase within the mixer is provided partway along the pressure passage.