Gas Boiler Output Adjusting Device for Precise Air-Gas Mixture Control
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Solution Overview
Problem
Conventional gas boilers have a complex structure and difficulty in accurately controlling the mixture ratio of air and gas for combustion, limiting the turn-down ratio (TDR) and user convenience, especially at low output ranges.
Innovation Solution
A simplified output adjusting device with integrally formed air and gas adjustment valves, driven by a single valve unit, allows for continuous adjustment of air and gas flow rates, ensuring a uniform mixture ratio proportional to the boiler output, even at low output levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate ventilator and gas valve are used to adjust air and gas supply, then the boiler can supply air and gas independently, but the device structure becomes complex and mixture ratio control becomes difficult
Solution Approach 1:
The patent combines the air adjustment valve and gas adjustment valve into a single integrated output adjusting device with a common valve body. This merging of previously separate components simplifies the overall device structure while maintaining the capability to independently adjust air and gas supply, directly resolving the contradiction between ease of operation and device complexity.
2Productivity
If ventilator rotation speed is reduced to lower air supply for low output, then air consumption is reduced, but wind pressure drops below threshold and air supply stops
Solution Approach 1:
The patent changes the control parameter from ventilator rotation speed to output adjusting device valve opening degree. By controlling the valve opening degree rather than rotation speed, the system can achieve low output levels without dropping wind pressure below the threshold, thus expanding the output adjustment range while maintaining air supply stability.
3Measurement precision
If additional control unit is added to control gas supply proportionally to air supply, then mixture ratio control improves, but device structure becomes more complex
Solution Approach 1:
The patent merges the air adjustment valve and gas adjustment valve into a single integrated device with a common valve body and coordinated valve cores. This integration eliminates the need for separate additional control units while maintaining precise proportional control of the mixture ratio through the mechanical linkage and coordinated movement of the valve cores.
4Device complexity
If integrally formed air and gas adjustment valves are used, then device structure is simplified and mixture ratio control is improved, but manufacturing complexity may increase
Solution Approach 1:
The integrated output adjusting device is designed with a modular structure where the valve body, air adjustment valve, and gas adjustment valve are integrally formed but can be assembled as coordinated units. The first and second valve cores are positioned in separate valve holes, allowing for standardized manufacturing processes that balance integration benefits with manufacturing ease.
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 enhances the turn-down ratio (TDR) and improves boiler performance by accurately controlling output across all ranges, including low output levels, thereby increasing user convenience and reducing temperature deviations.
Implementation Method 1
a ventilator 10 that introduces external air and supplies air necessary for combustion
Implementation Method 2
a burner 30 that combusts a mixture of the gas and the air supplied by the ventilator
Implementation Method 3
a heat exchanger 50 in which a heat exchange between combustion gas generated by the burner 30 and hot water occurs
Data Source
AI summary
A gas boiler and a method of adjusting output of the gas boiler by adjusting mixture ratio of air and gas for combustion in proportion to an output value of the boiler, and continuously changing the mixture regardless of the boiler output. The gas boiler includes a ventilator, a gas valve, a burner, a combustion chamber, a heat exchanger, and an exhaust gas hood. The inlet of the ventilator includes an output adjusting device having an air inlet; an air adjustment valve; a gas outlet; a gas adjustment valve that adjusts the gas passing through the gas outlet; and a valve driving unit that drives the air adjustment valve and the gas adjustment valve. Output of the burner is continuously adjusted by adjusting distance between the air adjustment valve and the gas adjustment valve, and distance between the air inlet and the gas outlet.