Pump Rod Mounting Linkage for Reduced Side Loading Wear
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Solution Overview
Problem
Axial displacement pumps in fluid dispensing systems face challenges with time-intensive mounting and detaching processes, and experience wear due to non-coincident driving forces, leading to reduced efficiency and lifespan.
Innovation Solution
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, minimizing misalignment of forces and reducing side loading, along with a clamping mechanism for secure mounting and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pump rod is attached to the reciprocating drive by a pin passing through the pump rod, then the pump rod can be secured to the reciprocating drive, but the attachment process requires loose parts and several tools and is time-intensive
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 cavity that receives the drive link, creating a unified structure that simplifies attachment while maintaining secure connection.
Solution Approach 2:
The drive link acts as an intermediary component between the reciprocating drive and the pump rod. The drive link includes a cavity that receives the pump rod head, providing a simplified interface that eliminates the need for pins and multiple fastening operations.
2Reliability
If the pump rod is pinned to the reciprocating drive, then the pump rod can be secured, but the process requires several tools and is time-intensive
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 cavity that receives the drive link, creating a unified structure that simplifies attachment while maintaining secure connection.
Solution Approach 2:
The pin and fastening operations are extracted from the attachment process. Instead of using pins that require insertion through holes and subsequent fastening, the design uses a cavity-based interface where the drive link simply receives the pump rod head, eliminating the need for pins and multiple tools.
3Ease of operation
If driving forces are not coincident with the centerline of the displacement pump, then the pump rod can be driven, but the pump rod experiences wear on various components of the axial displacement pump
Solution Approach 1:
The load concentrating feature is positioned at a specific location on the pump rod head to concentrate the driving force at a precise point. This localized force application ensures that the driving force is coincident with the pump rod centerline, preventing side loads and wear on sealing and aligning surfaces while maintaining effective driving action.
4Reliability
If a load concentrating feature is added to the pump rod head, then driving forces can be concentrated to minimize misalignment, but the head area is increased
Solution Approach 1:
The load concentrating feature is positioned at a specific location on the pump rod head to concentrate the driving force at a precise point. This localized force application ensures that the driving force is coincident with the pump rod centerline, preventing side loads and wear on sealing and aligning surfaces while maintaining effective driving action.
Solution Approach 2:
The load concentrating feature extends in the axial dimension from the head surface, concentrating force in a specific direction rather than distributing it across a larger surface area. This dimensional approach allows force concentration without significantly increasing the lateral footprint of the head.
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.