Pump Rod and Drive Link Retention for Centerline Load Alignment
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Solution Overview
Problem
Axial displacement pumps in fluid dispensing systems face challenges with time-intensive pinning and detaching processes, and experience wear due to non-coincident driving forces, leading to reduced efficiency and lifespan.
Innovation Solution
The implementation of a pump rod with a load concentrating feature and a driving link system that includes a U-shaped flange and cavity configuration to secure the pump rod, reducing misalignment of forces and side loading, and a clamping mechanism using an axial ring and tightening ring for secure mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pin is used to attach the pump rod to the reciprocating drive, then the pump rod can be securely connected, but the process becomes time-intensive and requires loose parts and several tools
Solution Approach 1:
The pump rod head is integrated directly with the pump rod shaft, eliminating the need for separate pins and loose parts. The head includes a built-in cavity that receives the driving link, creating a unified structure that reduces assembly complexity and time while maintaining secure connection through the U-shaped flange and cavity configuration.
Solution Approach 2:
The cavity in the pump rod head acts as an intermediary structure that receives and secures the driving link through the U-shaped flange. This intermediary design eliminates the need for traditional pinning mechanisms while providing secure attachment, thereby reducing assembly time and tool requirements.
2Reliability
If the pump rod is attached to the reciprocating drive with a pin, then connection is achieved, but the pump rod experiences driving forces not coincident with its centerline, causing wear
Solution Approach 1:
The load concentrating feature is strategically positioned at the center of the pump rod head to concentrate driving forces locally at the centerline. This local quality enhancement ensures that forces are applied coincident with the centerline, preventing side loading and wear on surrounding components while maintaining overall connection stability.
Solution Approach 2:
The pump rod head cavity and U-shaped flange are pre-configured to guide the driving link into proper alignment before force application. This preliminary alignment ensures that driving forces are coincident with the centerline from the start of operation, preventing side loading and wear that would occur with misaligned pin connections.
3Manufacturing precision
If threaded connection is used to secure the axial displacement pump to the drive housing, then concentricity is provided, but the mounting process is complex and time-consuming
Solution Approach 1:
The threaded connection feature is extracted from the pump body and relocated to the pump rod head assembly. This extraction allows the main pump body to be mounted to the drive housing using simpler clamping mechanisms while maintaining concentricity through the relocated threading, thereby reducing overall mounting complexity.
Solution Approach 2:
The pump rod head cavity serves as an intermediary mounting interface that receives the driving link with the U-shaped flange. This intermediary configuration provides both mechanical attachment and concentricity alignment, eliminating the need for complex threaded mounting of the entire pump assembly while maintaining manufacturing precision.
Data Source
AI summary
A pump rod has a head extending from a neck, and the head is received within a drive slot of a drive link. The head includes a projection, and has an area smaller than an area of the head. The projection contacts an inner surface of the drive slot. The drive link may include a projection aligned with a centerline of the drive link. The drive link projection contacts a head of the pump rod. The projections provide a reduced contact area between the pump rod and the drive link, thereby reducing any side-loading on the pump rod and increasing a lifespan of the wear parts.