Dual Venturi Damper Structure for Wider Burner Turn-Down
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Solution Overview
Problem
Conventional dual venturi designs for combustion devices are complex, leading to reduced productivity, insufficient airtightness, and increased costs, while also limiting the turn-down ratio due to the need for high pressure differences to control gas flow.
Innovation Solution
A simplified dual venturi design incorporating a motor-driven damper with concave and convex guides, a movable body, and a valve body made of rubber or silicone, allowing for efficient control of air and gas flow by dividing the housing into primary and secondary channels, enabling easy adjustment of the turn-down ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dual venturi designs are used to control gas and air flow, then the turn-down ratio is limited, but the structure becomes complex and airtightness is insufficient
Solution Approach 1:
The patent combines the gas valve and air damper into a single integrated opening/closing unit that controls both secondary gas and air simultaneously. This merging of functions into one unified mechanism ensures coordinated operation, maintains airtightness through unified sealing, and eliminates the complexity of separate control systems while achieving the required turn-down ratio.
2Reliability
If high pressure difference is applied to control gas flow, then the turn-down ratio is limited, but the gas supply pressure cannot be increased infinitely
Solution Approach 1:
The patent segments the gas and air supply into primary (always open) and secondary (controllable) pathways. The integrated opening/closing unit controls the secondary pathways, allowing precise modulation of total flow without requiring excessive pressure differences. This segmentation enables the system to achieve high turn-down ratios by selectively opening/closing secondary pathways rather than relying solely on pressure modulation.
3Ease of manufacture
If the structure is simplified to reduce production costs, then manufacturing becomes easier, but operational reliability may be compromised
Solution Approach 1:
The integrated opening/closing unit performs multiple functions simultaneously: it controls both secondary gas and air flow, provides unified sealing to maintain airtightness, and enables precise turn-down ratio control. This multi-functionality reduces the number of separate components needed, simplifying manufacturing while maintaining operational reliability through coordinated control of all secondary pathways in a single mechanism.
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 design enhances operational reliability, reduces production costs, and allows for precise control of heat output, improving the turn-down ratio and reducing fuel costs by simplifying the structure and manufacturing process.
Implementation Method 1
a first venturi (100) into which the primary gas and the primary air are introduced and mixed with each other; a second venturi (200) into which the secondary gas and the secondary air are introduced and mixed with each other
Implementation Method 2
a motor is combined with a damper so that the damper is rotated by the operation of the motor and simultaneously opens and closes the inlets for secondary air and gas
Data Source
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AI summary
A dual venturi for a combustion device that can control the quantities of gas and air supplied to the burner of a water heater and in which a motor is combined with a damper so as to simultaneously open and close the inlets for secondary air and gas and efficiently control the quantity of heat, in order to increase the turn-down ratio. The dual venturi includes: a housing having a discharge part coupled to a turbo fan; an air supply unit divided into first and second air supply units; a gas supply unit divided into first and second gas supply units communicating with the first and second air supply units; and an opening and closing unit that blocks the flow of secondary air and secondary gas when needing a low quantity of heat, and opens both the second air supply unit and the second opening when needing a high quantity of heat.