Variable-Chamber Piston Pump for Reliable Short-Stroke Dispensing
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Solution Overview
Problem
Piston pumps face difficulties in dispensing fluids proportionately with short stroke movements and initial priming, as they struggle to replace air with liquid effectively when the piston stroke is less than full, leading to inefficient fluid dispensing.
Innovation Solution
A piston pump assembly with a variable piston chamber length, featuring one-way inlet and outlet valves that adjust their positions based on the stroke length, ensuring fluid flow is controlled and air is replaced efficiently, regardless of stroke length, through frictional engagement and sliding mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the piston stroke is reduced to a lesser extent than full stroke, then the dispensing volume is reduced, but the ability to replace air with liquid and dispense fluid proportionately deteriorates
Solution Approach 1:
The inlet valve is made movable relative to the piston chamber, allowing its position to be adjusted dynamically. During priming operations, the inlet valve can be positioned at an initial location optimized for air evacuation. During dispensing operations, it can be repositioned to a different location for proportional fluid dispensing. This dynamic repositioning capability allows the system to adapt to different operational requirements, resolving the contradiction between reduced dispensing volume and reliable fluid dispensing.
2Productivity
If the piston stroke is reduced, then the dispensing speed increases, but the initial priming efficiency and air replacement capability worsen
Solution Approach 1:
The inlet valve's movable design enables it to be repositioned between priming operations and dispensing operations. During priming, the valve can be positioned to maximize air evacuation efficiency. During subsequent dispensing operations, the valve position can be adjusted to optimize proportional fluid dispensing. This dynamic adjustment capability allows the system to maintain high dispensing speed while ensuring effective initial priming and air replacement.
3Device complexity
If the inlet valve position is fixed, then the device complexity is reduced, but the ability to dispense different volumes proportionately to stroke length deteriorates
Solution Approach 1:
The inlet valve is designed with movable capability along the piston chamber axis, allowing its position to be adjusted to different locations. This enables the system to dispense different volumes of fluid proportionately to the piston stroke length. The movable valve design provides adaptability for various dispensing requirements while maintaining a relatively simple overall structure, resolving the contradiction between device complexity and dispensing adaptability.
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
The solution enables efficient fluid dispensing in both short and long stroke operations by maintaining fluid flow control and preventing air entry, ensuring consistent and proportional fluid delivery.
Implementation Method 1
one-way inlet valve in the chamber inwardly of the piston forming element permitting fluid flow outwardly in the chamber past the inlet valve and preventing fluid flow inwardly in the chamber past the inlet valve
Implementation Method 2
a piston forming element slidably received in the chamber having an inner end in the chamber and an outer end which extends outwardly from the open end of the chamber
Data Source
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AI summary
A piston pump which permits advantageous operation over both short stroke piston movement and long stroke piston movement by variation of the piston chamber length.