Rotatable Recirculation Means for Burner Mixing Device
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Solution Overview
Problem
Existing burner mixing devices lack user-friendly variability and adjustability in recirculation opening passage cross-sections, requiring boiler pivoting for adjustments, which complicates operation and maintenance.
Innovation Solution
A mixing device with axially fixed and rotatable recirculation means within the transition area between the burner and flame tubes, allowing for adjustable passage cross-sections without opening the boiler, featuring inclined slots and an annular element with a peripheral wall for minimal airflow disruption and optimal mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the mixing head is made axially displaceable to adjust the passage cross-section of recirculation openings, then the adjustability is improved, but the device complexity and security against leakage air inflow deteriorate
Solution Approach 1:
The invention applies the dynamics principle by making the recirculation means rotatable about the longitudinal axis instead of axially displaceable. This rotational movement dynamically changes the passage cross-section of recirculation openings while keeping the mixing head axially fixed, thus achieving adjustability without compromising structural simplicity or sealing reliability.
2Device complexity
If the burner is designed with fixed mixing head to simplify structure, then the device complexity is reduced, but the ease of operation for adjusting recirculation openings deteriorates
Solution Approach 1:
The invention introduces a rotational degree of freedom to the otherwise fixed mixing head structure. The recirculation means can rotate about the longitudinal axis to adjust the passage cross-section, maintaining structural simplicity while enabling easy operation during burner运行 without requiring boiler opening or complex mechanisms.
Solution Approach 2:
Instead of adjusting the passage cross-section through axial displacement (one-dimensional movement), the invention uses rotational movement (another dimension) of the recirculation means about the longitudinal axis. This dimensional change simplifies the overall structure while maintaining adjustability functionality.
3Adaptability or versatility
If recirculation means are made axially displaceable to adjust passage cross-section, then the adaptability is improved, but the reliability against leakage air inflow deteriorates
Solution Approach 1:
The invention achieves adjustability through rotational movement of recirculation means about the longitudinal axis rather than axial displacement. This maintains the axial sealing position and integrity, preventing leakage air inflow while still allowing passage cross-section adjustment through the rotational mechanism.
Data Source
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AI summary
The mixer (10) has a flame pipe (30) arranged adjacent to a burner pipe (20), and a nozzle fitting (40) arranged in the burner pipe. An air nozzle (60) is axially arranged in the burner pipe, and is extended into the flame pipe, and recirculation openings (85) arranged in a transition region between the burner pipe and the flame pipe. A recirculation unit (70) is axially fixed and rotatably arranged in a longitudinal axle within the transition region when rotation of passage cross-section (86) of the recirculation openings is varied. An independent claim is also included for a burner comprising an opening.