Dual Venturi Structure for Airtight Air-Gas Flow Control
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Solution Overview
Problem
Conventional dual venturi for combustion devices require a large number of components, leading to reduced productivity and insufficient airtightness in the opening and closing unit, which affects the control of secondary gas and air flow.
Innovation Solution
A dual venturi design with a housing divided into primary and secondary air/gas channels, featuring a motor-driven damper and movable body with concave and convex guides, and a valve body made of rubber or silicone, allowing for efficient control of heat output by blocking or opening secondary air and gas channels based on heat demand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dual venturi design is used, then secondary air and gas flow can be controlled, but the structure becomes complex with many components reducing productivity
Solution Approach 1:
The patent combines the secondary air valve and secondary gas valve into a single integrated opening and closing unit. The movable body simultaneously controls both the secondary air inlet and secondary gas inlet, reducing the number of components while maintaining the ability to control both flows independently through the integrated valve structure
Solution Approach 2:
The opening and closing unit serves multiple functions: it controls both secondary air and secondary gas flow, provides airtight sealing for both channels, and enables turn-down ratio control. This multi-functional design eliminates the need for separate control mechanisms for each channel, simplifying the overall structure
2Ease of operation
If conventional opening and closing unit is used, then flow control is possible, but airtightness is insufficient affecting control precision
Solution Approach 1:
The patent employs flexible sealing elements including a sealing ring and elastic sealing member that conform to the mating surfaces when the valve closes. These flexible components ensure airtight sealing by adapting to surface irregularities and maintaining continuous contact under pressure, preventing gas or air leakage
3Reliability
If more components are added to improve airtightness, then sealing performance improves, but device complexity increases
Solution Approach 1:
The sealing functions for both secondary air and secondary gas channels are integrated into a single opening and closing unit with shared sealing elements. The movable body and valve body structure provides sealing for both channels simultaneously, eliminating the need for separate sealing mechanisms and reducing overall component count while maintaining airtightness
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 simplifies the structure, reduces production time and costs, and enhances operational reliability by allowing precise control of heat output, thereby minimizing fuel costs and improving turn-down ratio.
Implementation Method 1
dual venturi for combustion device
Data Source
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.