Pump Rod Mounting With Centerline Force Alignment
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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 misaligned driving forces, which affect the pump rod and various components.
Innovation Solution
The design incorporates 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 and side loading by concentrating forces along the centerline, and 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 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 cavity that receives the driving link, creating a unified structure that simplifies attachment while maintaining secure connection.
Solution Approach 2:
The pump rod head cavity is designed to self-align and self-secure with the driving link through complementary geometric features, eliminating the need for additional tools or complex assembly procedures. The integrated design allows the components to service their own attachment function.
2Reliability
If the pump rod is pinned to the reciprocating drive, then the pump rod can be secured, but wear occurs on various components of the axial displacement pump due to misaligned driving forces
Solution Approach 1:
The driving forces are concentrated at a specific location on the pump rod head through the cavity design, ensuring that the force application point coincides with the pump rod centerline. This localized force concentration prevents misalignment and reduces wear on pump components.
Solution Approach 2:
The pump rod head cavity acts as an intermediary element between the driving link and the pump rod shaft. It receives and transmits the driving forces while maintaining proper alignment, preventing direct transmission of misaligned forces that would cause wear.
3Manufacturing precision
If the axial displacement pump is threaded into the drive housing, then concentricity can be provided to the pump and driving mechanism, but the mounting and detaching process becomes time-intensive
Solution Approach 1:
The mounting system is segmented into modular components including the pump rod head with cavity, the driving link with protrusion, and the clamp assembly. This segmentation allows for quick assembly and disassembly while maintaining concentricity through precision-machined mating surfaces and alignment features.
Solution Approach 2:
The pump rod head cavity and driving link protrusion are pre-configured with complementary geometric features that ensure proper alignment and concentricity before final assembly. This preliminary configuration of alignment features eliminates the need for time-consuming adjustment during mounting.
4Reliability
If a pin is used to secure the pump rod to the reciprocating drive, then the connection can be made, but loose parts are required and the process becomes complex
Solution Approach 1:
The pump rod head is merged with the pump rod shaft to form an integrated component. The cavity in the head receives the driving link protrusion, eliminating the need for separate pins and reducing the number of loose parts. This integration simplifies the overall device structure and reduces assembly complexity.
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.