Metering Pump Stroke Limiter Mechanism
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Solution Overview
Problem
Metering positive displacement pumps lack a reliable and easily implementable method to lock or limit the stroke length, leading to potential human error, mechanical complexity, and increased maintenance costs, which can result in system failures and costly downtime.
Innovation Solution
A limiter system is introduced, comprising a hollow body with an axial slot, installed over the stroke adjustment shaft of the metering positive displacement pump, limiting the axial translation of the stroke adjustment knob to ensure a minimum permissible stroke length is maintained.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional mechanical or electrical mechanisms are used for locking or limiting pump stroke, then stroke limitation functionality is achieved, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent employs a simple, inexpensive mechanical limiter that can be easily replaced if needed, rather than using complex electrical or electronic systems. The limiter is a basic mechanical component with a slot and positioning feature that physically restricts stroke adjustment without requiring power, control systems, or complex mechanisms.
Solution Approach 2:
The patent extracts only the essential function of stroke limitation from complex mechanical or electrical systems, implementing it through a simple mechanical barrier. The limiter removes the capability to adjust beyond a certain point without requiring the complexity of remote control systems, electrical locks, or sophisticated mechanical linkages.
2Ease of operation
If remote control mechanisms are used for stroke locking, then stroke control is improved, but ease of operation and maintenance difficulty worsen
Solution Approach 1:
The limiter is designed to be self-contained and self-explanatory, requiring no external control systems, power sources, or complex operation procedures. The physical slot and positioning feature provide intuitive, immediate stroke limitation that requires no training or specialized knowledge to operate or maintain.
Solution Approach 2:
The patent removes all unnecessary control systems, electrical components, and remote operation mechanisms, leaving only the essential mechanical limitation function. This extraction simplifies both operation and maintenance while achieving the desired stroke control.
3Adaptability or versatility
If pump modifications are made to add stroke locking mechanisms, then stroke limitation capability is achieved, but manufacturing cost and adaptability worsen
Solution Approach 1:
The limiter is designed as a separate, modular component that can be added to existing pumps without modifying the pump itself. The standalone design allows it to be manufactured independently and installed on various pump models, maintaining adaptability while avoiding costly pump reconfiguration.
Solution Approach 2:
The limiter is designed with universal applicability, featuring a generic mounting interface and adjustment mechanism that can work with multiple pump types. The slot-based design and positioning features provide adaptable stroke limitation across different pump configurations without requiring custom modifications.
Data Source
AI summary
A system includes a metering positive displacement pump including a body, a stroke adjustment shaft and a stroke adjustment knob, the stroke adjustment knob operable to translate axially with respect to the body to set a stroke length of the metering positive displacement pump. The system further includes a limiter having a hollow body with an axial slot defined across the hollow body, the limiter having a predetermined length corresponding to a minimum permissible stroke length of the metering positive displacement pump, wherein the limiter is installed over the stroke adjustment shaft of the metering positive displacement pump, and wherein axial translation of the stroke adjustment knob towards the body of the metering positive displacement pump is limited by the limiter to prevent setting the stroke length below the minimum permissible stroke length.