Oscillating Displacement Pump Pressure Equalization

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Solution Overview

Problem

Existing oscillating displacement pumps with rigidly connected displacers experience flow irregularities due to differing pre-compression pressures in pump chambers, leading to uneven liquid delivery and pulsation, especially when handling liquids with varying viscosities and filling levels.

Innovation Solution

Implementing a method where pressure equalization occurs between pump chambers during the pre-compression phase but is prevented during the delivery stroke, using mechanisms like fluid spaces connection and shut-off valves to ensure simultaneous and uniform liquid delivery across all chambers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If displacers are rigidly connected with a common drive, then the pump structure is simple and easy to manufacture, but flow irregularities and pulsation occur due to differing pre-compression pressures in pump chambers

Engineering Contradiction:

Improvepump structure simplicityVSAvoidflow uniformity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The pump system is segmented into independent pump chambers, each with its own displacer that can be independently controlled. This segmentation allows each chamber to be optimized for its specific liquid properties, eliminating the flow irregularities caused by rigid connection while maintaining structural simplicity through modular design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The displacers are made dynamically controllable through independent drive mechanisms that can adjust their motion parameters in real-time. This dynamic control allows the system to compensate for differences in liquid viscosity and filling levels, maintaining uniform flow delivery while preserving the overall structural simplicity of the pump.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If different pre-compression pressures occur in pump chambers, then the pump can handle varying liquid properties, but uneven liquid delivery and pulsation result

Engineering Contradiction:

Improveliquid property accommodationVSAvoiddelivery uniformity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The system dynamically changes operational parameters including pre-compression pressure, displacer speed, and stroke length for each pump chamber based on the specific liquid properties being handled. This parameter optimization ensures uniform delivery while maintaining the ability to accommodate varying liquid viscosities and filling levels.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

Pressure sensors and flow meters provide real-time feedback on the state of each pump chamber, allowing the control system to adjust displacer motion and pre-compression pressure to maintain uniform delivery. This feedback mechanism eliminates pulsation while preserving adaptability to different liquid properties.

Inventive Principle:

Principle #23Feedback

3Productivity

If one pump chamber finishes pre-compression before another, then delivery can begin earlier from that chamber, but flow irregularities occur due to asynchronous delivery

Engineering Contradiction:

Improvedelivery timingVSAvoidflow regularity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The control system synchronizes the periodic motion of displacers in different pump chambers to ensure they complete pre-compression and begin delivery simultaneously. This coordinated periodic action eliminates flow irregularities while maintaining high productivity through optimized timing sequences.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system performs preliminary coordination of displacer motion and pre-compression timing to ensure all pump chambers are ready to deliver simultaneously. This preliminary synchronization prevents flow irregularities while maximizing the productivity of the pump system.

Inventive Principle:

Principle #10Preliminary action

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 approach ensures that liquids are delivered uniformly and simultaneously from all pump chambers, reducing pulsation and flow irregularities by maintaining equal pre-compression pressures across chambers during delivery, thereby enhancing the pump's efficiency and consistency.

Implementation Method 1

the hydraulic pressure applied in the hydraulic drive cylinder is regulated

Methodology Applied

Scientific EffectHydraulic pressure: Pascal's Law

Implementation Method 2

the liquid sucked into the associated pump chamber is pre-compressed in a pre-compression phase and comes to a standstill when a predeterminable pre-compression pressure is reached

Methodology Applied

Scientific EffectFluid compression: Compression

Data Source

PatentEP1843040B1Method for operating an oscillating displacement pump and oscillating displacement pump

Publication Date: 2010.04.21 HOFMANN MASCHFAB & VERTRIEB

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AI summary

Method involves accomplishment of pressure compensation between the individual pump chambers (1,2), during the pre-compressions phase and prevention of pressure compensation between the individual pump chambers, during the subsequent conveying stroke. The two pump chambers are provided for each liquid and movable displacement body (4,5). One of the displacement bodies absorbs liquid during the actual conveying phase of the other displacement body. An independent claim is included for the oscillating positive-displacement pump.