Detachable Wingtips for Pulverizer Air Flow Control
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Solution Overview
Problem
Conventional air flow control arrangements in coal pulverizers face challenges with changeability and convenience during wear and tear, as the welded engagement between inner and outer rings and vanes makes it difficult to replace individual parts economically and efficiently.
Innovation Solution
An adaptable air flow control arrangement featuring inner and outer ring segments, vanes, and wingtips, where the wingtips are detachably attached via flanges and fasteners, allowing for easy replacement, and optionally a two-piece structure with protrusion-recess configuration, along with a visual wear indicator for timely part replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If welded engagement is used between inner and outer rings and vanes, then structural strength and reliability are improved, but ease of repair and changeability deteriorate
Solution Approach 1:
The air flow control arrangement is divided into separate modular components: inner ring, outer ring, vanes, and wingtips. Each component can be independently removed and replaced without affecting the others, transforming the previously welded monolithic structure into a segmented assembly that maintains structural integrity while enabling easy maintenance.
Solution Approach 2:
The connection method transitions from static welded joints to dynamic detachable connections using fasteners. This allows the structure to adapt between being firmly connected during operation and easily separated during maintenance, providing operational flexibility that welded structures cannot achieve.
2Reliability
If welded engagement is used between inner and outer rings and vanes, then structural integrity is improved, but loss of time during replacement increases
Solution Approach 1:
By segmenting the structure into independently replaceable components (inner ring, outer ring, vanes with attached wingtips), the replacement process is dramatically accelerated. Only the worn component needs to be removed and replaced, rather than disassembling or cutting welded joints, reducing replacement time from hours to minutes.
Solution Approach 2:
The detachable fastener connections are pre-configured in the design, allowing components to be quickly removed and replaced without requiring complex disassembly procedures. The flange and fastener system is prepared in advance to enable rapid interchange of worn parts.
3Ease of manufacture
If conventional welded design is used, then manufacturing simplicity is maintained, but adaptability for different wear scenarios deteriorates
Solution Approach 1:
The design segments the air flow control arrangement into standardized modules that can be manufactured independently using simple processes, then assembled together. This modular approach maintains manufacturing simplicity while dramatically improving adaptability, as individual components can be replaced or upgraded without redesigning the entire structure.
Solution Approach 2:
The standardized flange and fastener connection system serves multiple functions: it provides structural connection during operation, enables rapid replacement during maintenance, and allows for future upgrades or modifications. This universal connection approach enhances adaptability without complicating the manufacturing of individual components.
Data Source
AI summary
An air flow control arrangement for a pulverizer includes an inner ring segment, an outer ring segment, a plurality of vanes, and a plurality of vanes. The inner and outer ring segments are adaptably configured in a spaced relation to each other. Further, the plurality of vanes is spaced apartly arranged between the inner and outer ring segments to form flow ducts. Furthermore, each wingtip of the plurality of wingtip is detachably attached to a respective vane of the plurality of vanes to be adaptably replaceable or changeable.