Displacement Pump Mounting With Centerline Load 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 with an axial ring and tightening ring for secure mounting.
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 mounting and detaching 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 bore that receives the drive shaft, creating a unified component that reduces assembly complexity and time while maintaining secure attachment.
Solution Approach 2:
The pin connection is extracted and replaced with a direct bore-and-shaft interface. This removes the intermediate fastening element (pin) and simplifies the attachment mechanism to a straightforward insertion and retention system.
2Reliability
If the pump rod is pinned to the reciprocating drive, then the connection can be secured, but the process requires several tools and loose parts
Solution Approach 1:
The pump rod head and shaft are merged into a single integrated component. The head includes an internal bore that directly receives the drive shaft, eliminating the need for separate pins, washers, and fastening tools.
Solution Approach 2:
The pin and associated fastening hardware are extracted from the design. The connection is achieved through the bore-and-shaft interface alone, reducing the number of loose parts and tools required.
3Ease of operation
If the driving forces are not coincident with the centerline of the displacement pump, then the pump can be mounted, but the pump rod experiences wear on various components
Solution Approach 1:
The pump rod head is designed with an asymmetric bore configuration that is offset from the centerline of the pump rod shaft. This asymmetric positioning allows the drive forces to be applied at an angle that is not coincident with the centerline, while the head geometry ensures that wear is concentrated on specific surfaces rather than distributed across all components.
Solution Approach 2:
The head design creates localized wear zones through its geometric configuration. By positioning the bore and contact surfaces in specific locations, the design directs wear to predetermined areas of the head and shaft, protecting more critical components from degradation.
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 flange projects from a pump body of the pump and a ring projects from the pump body of the pump. A portion of the drive housing is received in a gap between the flange and the ring.