Long Stroke Parallel Pump Slider-Crank Mechanism
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Solution Overview
Problem
Conventional reciprocating fluid pumps face limitations in increasing stroke length without escalating crankshaft size, leading to higher manufacturing costs and reduced service life, while also occupying significant space and requiring frequent valve replacements.
Innovation Solution
A long stroke parallel pump design featuring a slider-crank mechanism with a rotating member assembly and sliding member assembly positioned beneath the driveshaft, allowing for increased stroke length without increasing pump height and using a gear box to reduce prime mover rpm and increase torque, thereby reducing wear and tear on pump components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If stroke length is increased using a crankshaft mechanism, then fluid flow capacity is improved, but crankshaft diameter must increase proportionally resulting in higher manufacturing cost and increased pump height and weight
Solution Approach 1:
The patent repositions the slider-crank mechanism from a vertical arrangement (above the driveshaft) to a horizontal arrangement (parallel to the driveshaft). This dimensional change allows the stroke length to extend horizontally rather than vertically, achieving long stroke without increasing pump height. The slider-crank mechanism is arranged in a parallel horizontal plane underneath the top components, creating a switch-back type design that maintains compact vertical footprint.
2Productivity
If pump speed is increased to increase fluid flow capacity, then productivity is improved, but valve wear increases resulting in reduced service life and increased replacement cost
Solution Approach 1:
The patent changes the operational parameters by enabling long stroke operation at reduced pump speeds. The slider-crank mechanism is designed to accommodate extended stroke lengths that allow the pump to move larger volumes of fluid per cycle, compensating for the lower operating speed. This parameter change maintains productivity while significantly reducing the number of valve cycles and associated wear.
3Reliability
If various pump components are interconnected within the system, then the pump functions properly, but the pump occupies large volume and space
Solution Approach 1:
The patent merges the slider-crank mechanism with the driveshaft assembly by positioning it in a parallel horizontal plane underneath the top components. This integration allows the rotating member assembly and sliding member assembly to share the same structural space, creating a compact switch-back type design that reduces overall pump volume while maintaining proper component interconnection and functionality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables a similar fluid flow at slower pump speeds, reducing wear and tear on components and extending the service life of the pump while maintaining a compact footprint.
Implementation Method 1
The fluid pump described here can include a slider-crank mechanism that converts rotational motion of a crankshaft to lateral reciprocation movement of a plunger or piston
Implementation Method 2
This reciprocation motion can create a suction phenomenon in a cylinder while traveling on one direction
Implementation Method 3
and a discharge phenomenon while traveling in an opposing direction
Data Source
AI summary
Various embodiments disclosed relate to a reciprocating triplex pump. The present disclosure includes a reciprocating triplex pump with a longer stroke time. Such a pump can include a prime mover with a shaft extending longitudinally; a gear box arranged longitudinally along the shaft, the gear box for actuating the prime mover; and a slider-crank mechanism laterally offset from the gear box. The slider-crank mechanism can include a rotating member assembly, a sliding member assembly, and a connecting rod assembly.