Pump Rod Drive Link Mounting to Reduce Misalignment Wear
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Solution Overview
Problem
Existing axial displacement pumps in fluid dispensing systems require time-consuming processes for attaching and detaching the pump rod to the reciprocating drive, and experience misalignment of driving forces, leading to wear on components.
Innovation Solution
A pump rod with a load concentrating feature and a driving link system that secures the pump rod within a cavity, minimizing misalignment and wear by concentrating driving forces along the centerline, using a clamp mechanism for easy installation and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pump rod is attached to the reciprocating drive using a pin and loose parts, then the connection can be secured, but the attachment and detachment process becomes time-consuming and complex
Solution Approach 1:
The pump rod head is merged with the drive link body to form an integrated component. The drive link includes a cavity that receives the pump rod head, and a U-shaped flange that extends into the cavity to secure the head without requiring separate pins or loose parts. This integration eliminates multiple components and simplifies the attachment process.
Solution Approach 2:
The drive link is designed with self-aligning features including a conical surface that automatically aligns the pump rod head with the drive link cavity during insertion. The U-shaped flange automatically positions itself to secure the head without requiring additional fastening operations, enabling quick attachment and detachment.
2Reliability
If the pump rod is secured using traditional pinning methods, then the connection is established, but the process requires several tools and multiple steps
Solution Approach 1:
The securing mechanism is merged into the drive link structure itself. The U-shaped flange is an integral part of the drive link body that extends into the cavity to retain the pump rod head. This eliminates the need for separate pins, nuts, or fastening tools, reducing device complexity while maintaining connection stability.
Solution Approach 2:
The conical alignment surface and U-shaped flange work together as a self-service mechanism. During insertion, the conical surface automatically guides and aligns the pump rod head, and the flange automatically engages to secure it, eliminating the need for multiple tool operations or complex assembly steps.
3Ease of operation
If the driving forces are not coincident with the centerline of the displacement pump, then the pump can be driven, but the pump rod experiences misalignment and wear on components
Solution Approach 1:
The drive link cavity and pump rod head are designed with asymmetric conical surfaces that taper toward the centerline of the pump. This asymmetric geometry guides the driving forces to converge at the centerline, ensuring proper alignment and preventing misalignment wear on the pump rod and surrounding components.
4Ease of operation
If a clamp mechanism is used for mounting, then installation and removal become easier, but the mounting system must provide adequate alignment and retention
Solution Approach 1:
The conical alignment surface is designed with a specific taper angle that provides self-aligning action during insertion. This asymmetric geometry ensures that the pump rod head automatically centers itself within the drive link cavity, providing reliable alignment and retention while maintaining ease of installation.
Data Source
AI summary
A displacement pump is configured to mount to a drive housing. A reciprocating drive is connectable to a pump rod of the displacement pump and includes a connecting rod and a drive link that receives a head of the pump rod. A tightening ring connects the displacement pump to the drive housing to mount the displacement pump to the drive housing.