Overlapping Link Chain for Dry Coal Extrusion Pumps
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Solution Overview
Problem
Current dry coal extrusion pumps face internal shear failure zones and flow stagnation issues, leading to decreased mechanical efficiency in coal gasification processes.
Innovation Solution
A chain-based particulate material extrusion pump design featuring overlapping link bodies and ledges in forward and aft links, with a passageway defined by chains that include alternating forward and aft links, supports mechanical loads and prevents material stagnation through scraper seals and optimized sprocket geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dry coal extrusion pumps are used, then the pumping function is provided, but internal shear failure zones and flow stagnation problems occur leading to decreased mechanical efficiency
Solution Approach 1:
The chain is divided into multiple links with distinct bodies and ledges, where each link segment performs a specific function in the material transport process. The segmentation allows different parts of the chain to address different flow conditions, preventing stagnation and reducing shear stresses.
Solution Approach 2:
The invention introduces a vertical dimension by adding ledges that extend upward from the link bodies. This dimensional addition creates overlapping structures that prevent material stagnation and reduce shear failure zones by providing additional flow paths and support surfaces.
2Reliability
If chain links are designed with overlapping ledges, then material stagnation and shear failure are reduced, but the device complexity increases
Solution Approach 1:
The ledge structure is merged with the link body as an integrated component rather than a separate attachment. This merging simplifies the manufacturing process and reduces assembly complexity while maintaining the functional benefits of the overlapping ledge design.
Solution Approach 2:
The overlapping ledge structure serves multiple functions simultaneously: it prevents material stagnation, reduces shear stresses, provides structural support, and guides material flow. This multi-functionality reduces the need for additional separate components, thereby reducing overall device complexity.
Data Source
AI summary
A chain for a particulate material extrusion pump includes a plurality of links, each of the plurality of links having a link body and a link ledge, wherein each link ledge of the plurality of links at least partially overlaps the link body of an adjacent one of the plurality of links.