Tri-chamber Nutating Pump for Linear Flow
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Solution Overview
Problem
Conventional nutating pumps experience issues with splashing and stalling due to their non-linear dispense profiles, leading to inaccurate fluid delivery and increased maintenance, especially in applications requiring precise dispensing of viscous liquids like paints and cosmetics.
Innovation Solution
A tri-chamber nutating pump design is introduced, featuring a compensating piston and seal that modulates the output flow by retarding it during peaks and enhancing it during valleys, creating a more linear and pulsation-free flow profile through the use of a third chamber that compensates for cyclic pulsations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional nutating pump operates at constant motor speed to maintain simplicity of control, then the pump achieves high dispensing speed and productivity, but the non-linear sinusoidal dispense profile causes splashing and pulsations that reduce manufacturing precision and reliability
Solution Approach 1:
The single pump chamber is segmented into multiple chambers (first pump chamber and second pump chamber) that operate in sequence. The piston alternates between dispensing from the first chamber and filling the second chamber, creating multiple overlapping dispense strokes that smooth out the overall flow profile and eliminate pulsations while maintaining high dispensing speed
Solution Approach 2:
The dual-chamber design enables continuous useful action by ensuring that while one chamber is dispensing, the other is filling, and vice versa. This overlapping operation eliminates idle time and maintains continuous fluid delivery without pulsations, resolving the contradiction between speed and precision
2Manufacturing precision
If the motor speed is reduced to eliminate splashing and pulsations, then dispensing accuracy improves, but the overall productivity and dispensing speed decrease significantly
Solution Approach 1:
By segmenting the pump into multiple chambers that operate in parallel sequences, the system maintains high motor speeds while distributing the dispensing action across multiple chambers. This segmentation allows the pump to achieve smooth, pulsation-free delivery without reducing motor speed, thus maintaining both precision and productivity
3Device complexity
If a single pump chamber is used to maintain simple structure, then the device complexity is low, but the non-linear dispense profile causes harmful splashing and pressure spikes
Solution Approach 1:
The pump chamber is segmented into multiple chambers (first and second chambers) with separate intake and dispense pathways. This segmentation allows the system to maintain relatively simple overall structure while eliminating the harmful non-linear dispense profile through the coordinated operation of multiple chambers
Solution Approach 2:
Multiple pump chambers are merged into a single integrated pump system with a common piston and coordinated pathways. The chambers work together in unison to produce a combined linear dispense profile, merging their individual outputs to eliminate pulsations and pressure spikes while maintaining structural simplicity
4Measurement precision
If the piston completes full 360° revolutions to achieve accurate dispense volume, then dispensing precision is maintained, but the non-linear profile requires larger pump size or multiple revolutions for smaller volumes
Solution Approach 1:
The dispense volume is segmented across multiple chambers, allowing the system to achieve accurate small-volume dispensing by utilizing only a portion of the total chamber capacity. This segmentation enables precise control of dispense volume without requiring the pump to be oversized or to complete multiple revolutions
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 tri-chamber design ensures a steady and accurate output flow, reducing splashing and stalling, and maintaining precision and speed in dispensing viscous liquids, even at constant motor speeds, thereby improving the reliability and efficiency of nutating pumps.
Implementation Method 1
Nutating pumps are pumps having a piston that both rotates about its axis and contemporaneously slides axially and reciprocally within a liner or casing
Implementation Method 2
The third chamber, compensating piston and seal act to provide a cyclic displacement, which is used to compensate for cyclic pulsations in the output flow of the first two chambers
Data Source
Figure 1
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AI summary
A tri-chamber nutating pump (120) is disclosed which includes two pump chambers (142,144) disposed within a pump housing (121) that accommodates a nutating piston (110). A reciprocating compensating piston (209) is also provided with its own compensating housing (206) that is connected to the outlet (136). As a cumulative output from the first two pump chambers (142, 144) reaches its maximum level, the compensating piston (209) is pushed into the outlet (136) or through a passage (307) to reduce the output of the first two chambers (142, 144) and avoid splashing. As the output from the first two chambers (142, 144) reaches its minimum level, the compensating piston (209) is withdrawn from the outlet (136) or through a passage (307) thereby increasing the output of the third chamber (207) to its maximum level when the output from the first two pump chambers (142, 144) reaches its minimum level.