Displacement Pump Retention With Aligned Drive Link and Quick Mounting
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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 surrounding 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, and a clamping mechanism using an axial ring and tightening ring 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 built-in cavity that receives the driving link, creating a unified structure that simplifies attachment while maintaining secure connection.
Solution Approach 2:
The driving link acts as an intermediary component that connects to the pump rod head through a cavity interface. This intermediary structure enables tool-free attachment while ensuring reliable force transmission between the reciprocating drive and pump rod.
2Reliability
If the pump rod is secured to the reciprocating drive with a pin, then the pump rod can be attached, but driving forces not coincident with the centerline cause the pump rod to wear on various components
Solution Approach 1:
The pump rod head includes a specifically designed cavity with a U-shaped flange that provides a localized interface for force transmission. This localized structure ensures that driving forces are properly directed along the pump rod centerline, preventing side loads and wear on surrounding components.
3Manufacturing precision
If the axial displacement pump is threaded into the drive housing, then concentricity can be provided, but the mounting process is complex and time-consuming
Solution Approach 1:
The threading function is extracted from the pump body and replaced with a clamping mechanism consisting of a clamp and tightening ring. This extraction allows the pump to be mounted without complex threading operations while still achieving proper alignment and concentricity through the clamping structure.
Solution Approach 2:
The mounting system transitions from a static threaded connection to a dynamic clamping mechanism. The clamp can be adjusted and tightened to provide concentricity, and the entire assembly can be quickly removed and reinstalled, making the mounting process adaptable and time-efficient.
4Ease of operation
If a clamping mechanism is used to secure the pump, then mounting can be simplified, but additional components are required
Solution Approach 1:
The clamp serves multiple functions: it secures the pump to the drive housing, provides alignment, and enables quick mounting and detaching. The tightening ring integrates the tightening function into a single component, reducing the need for separate fasteners and tools.
Data Source
AI summary
A fluid spraying system includes a displacement pump 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 that includes threading is configured to rotate about a cylinder of the pump and shift axially along the cylinder and engage with a bottom side of the drive housing to secure the displacement pump to the drive housing.