Axially Symmetrical Venturi Mixer for Condensing Boiler Power Adjustment
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Solution Overview
Problem
Existing air-gas mixer devices for premix burner equipment in condensing boilers are not efficiently adjustable to different power ranges and lack structural compactness, requiring interchangeable parts for calibration.
Innovation Solution
An air-gas mixer device with an axially symmetrical Venturi effect conduit and a rotatable discoid body that adjusts the passage cross section by relative rotation, allowing for modulation of air flow rate and power adjustment without needing interchangeable parts, featuring a centripetal flow guide structure and a selectively reducible constricted section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If interchangeable Venturi conduits are used for different power ranges, then the device can be calibrated for specific power ranges, but the device complexity increases and structural compactness decreases
Solution Approach 1:
The patent applies the dynamics principle by making the Venturi conduit geometry adjustable through rotation of the mixing chamber relative to the conduit body. Instead of using fixed interchangeable conduits, the system allows dynamic adjustment of the passage cross-section area by rotating the mixing chamber to different angular positions, thereby adapting to different power ranges while maintaining a single integrated structure.
Solution Approach 2:
The patent implements universality by designing a single mixer device that can serve multiple power ranges through the adjustable geometry of the Venturi conduit. The mixing chamber can be rotated to create different effective passage areas, allowing one device to perform the function of multiple fixed conduits would have provided, thus reducing device complexity while maintaining adaptability.
2Adaptability or versatility
If interchangeable parts are used for power range adjustment, then calibration for different powers is possible, but ease of operation deteriorates due to part replacement requirements
Solution Approach 1:
The system transforms the static interchangeable parts approach into a dynamic adjustment mechanism. The mixing chamber can be rotated to different positions to adjust the passage cross-section area for different power ranges, eliminating the need to physically replace parts and significantly improving ease of operation while maintaining the ability to calibrate for different powers.
3Device complexity
If traditional Venturi conduits are used without axial symmetry, then the structure may be simpler, but the efficiency and functional design are reduced
Solution Approach 1:
The patent employs asymmetry in a controlled manner by using an axially symmetrical Venturi conduit design. The conduit body and mixing chamber are designed with axial symmetry around the flow axis, which optimizes the flow characteristics and mixing efficiency. This symmetrical design ensures uniform flow distribution and effective premixing, thereby improving productivity while maintaining reasonable structural simplicity.
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 solution enhances efficiency and simplifies adjustment by allowing power range modulation through simple rotation of components, achieving greater structural compactness and functional simplicity compared to prior solutions.
Implementation Method 1
guide means including a Venturi effect conduit structure
Implementation Method 2
conduits are provided having variations of cross section which are suitable creating a pressure drop correlated to the flow rate of air
Implementation Method 3
centrifugal fan 2, which is itself arranged to deliver the premixed air-gas flow
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
An air-gas mixer device, particularly for the premix burner equipment of condensing boilers, comprising flow guide means for guiding an air-gas mixture into the intake section (3a) of a centrifugal fan (2) unit with a predetermined axis of rotation (X), said intake section being coaxial with said axis of rotation, said guide means including a Venturi effect conduit structure (5) with contiguous converging and diverging portions delimiting a constricted section to which the gas flow is fed for mixing with the air flow fed through the converging conduit portion, wherein said guide conduit structure (5) is axially symmetrically developed with a main axis of symmetry coinciding with said axis of rotation (X) and is defined by the rotation about said axis of a flat section with respective contiguous converging and diverging portions (5a, 5b), which is positioned radially and is spaced apart from the axis and on whose plane said axis of rotation (X) lies.