Tapered Junk Ring Geometry for Easier Pump Maintenance
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Solution Overview
Problem
Existing junk rings for high pressure reciprocating pumps often get stuck during installation and removal due to their cylindrical outer surfaces, requiring manual hammering and causing time-consuming and potentially dangerous maintenance, which affects the pump's operational efficiency and lifespan.
Innovation Solution
A junk ring with a tapered outer surface design that allows for tilting during installation and removal, reducing the risk of sticking and facilitating easier manual handling, while maintaining sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cylindrical outer surface is used for the junk ring, then the sealing performance is maintained, but the junk ring gets stuck during installation and removal requiring manual hammering
Solution Approach 1:
The junk ring transitions from a symmetric cylindrical outer surface to an asymmetric tapered outer surface. The taper angle (5-15 degrees) creates an asymmetric geometry that allows the ring to be guided during installation and removal, preventing it from getting stuck while maintaining the sealing function through the ring's inner surface configuration
2Device complexity
If a cylindrical outer surface is used for the junk ring, then the structural simplicity is maintained, but manual hammering is required causing time-consuming and potentially dangerous maintenance
Solution Approach 1:
The tapered outer surface introduces a geometric asymmetry that is simple in form but provides complex functional benefits during installation and removal operations, eliminating the need for time-consuming hammering while adding minimal complexity to the overall structure
3Ease of manufacture
If a cylindrical outer surface is used for the junk ring, then the manufacturing simplicity is maintained, but the junk ring gets stuck causing potential damage and reduced operational efficiency
Solution Approach 1:
The tapered outer surface can be manufactured using standard machining processes with minimal additional complexity. The taper angle (5-15 degrees) is within standard machining capabilities and provides significant operational benefits by preventing the junk ring from getting stuck, thereby improving reliability and operational efficiency
Data Source
AI summary
A junk ring includes an upstream end, a downstream end, and a tapered outer surface between its upstream end and downstream end. The tapered outer surface extends at an angle relative to the upstream end and relative to the downstream end to allow the junk ring to tilt or tip during installation or removal without getting stuck in a fluid end bore segment.