Modular Asphalt Pumping System Pulsation Reduction
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Solution Overview
Problem
Conventional positive-displacement gear pumps experience significant fluid pulsations and cavitation, leading to damage, poor product quality, and safety hazards, especially when handling hot asphalt, which requires improved pulsation reduction and pressure safety in asphalt pumping systems.
Innovation Solution
A modular-component pumping system with intermeshing helical gears and a fluid return passage that cancels pressure pulses and includes a control valve to manage pressure thresholds, ensuring safe operation and adaptability in asphalt pumping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional positive-displacement gear pumps are used, then pumping capability is provided, but fluid pulsations occur causing damage to piping, meters, valves, and instrumentation
Solution Approach 1:
The patent combines two gear pumps in parallel within a single housing, sharing a common drive shaft and oil bath. This merging of pumping units creates complementary flow patterns that reduce overall pulsations while maintaining high productivity. The pumps work simultaneously but with phase-differentiated flow outputs that cancel each other's pulsation peaks.
Solution Approach 2:
The patent utilizes the periodic rotation of gears to create rhythmic, phase-shifted flow patterns. By synchronizing two gear pumps on a common shaft, the system achieves periodic flow delivery where the pulsation cycles of one pump offset those of the other, reducing net pulsation amplitude while maintaining continuous productive flow.
2Productivity
If conventional gear pumps operate at elevated speeds, then productivity increases, but cavitation occurs reducing performance and causing erosion
Solution Approach 1:
By merging two gear pumps into a single integrated unit with common drive and lubrication, the system achieves elevated speeds with improved reliability. The combined configuration balances hydraulic loads and reduces cavitation risk through distributed pressure zones, allowing higher operational speeds without performance degradation or erosion damage.
3Ease of operation
If hot asphalt is pumped to maintain workable temperature, then material flowability improves, but safety hazards increase due to thermal capacity
Solution Approach 1:
The patent introduces a common oil bath as an intermediary thermal management system. The oil bath acts as a heat transfer medium and safety buffer, absorbing excess thermal energy from the hot asphalt and providing controlled thermal regulation. This intermediary system maintains asphalt flowability while mitigating safety hazards through passive thermal capacity management.
Solution Approach 2:
The hydraulic oil bath system provides thermal management and safety control through fluid-mediated heat transfer. The hydraulic oil absorbs and dissipates thermal energy from the hot asphalt, creating a controlled thermal environment that maintains material flowability while preventing dangerous temperature escalation and associated safety hazards.
4Productivity
If conventional asphalt pump designs are used, then basic pumping function is provided, but adaptability and field configurability are limited
Solution Approach 1:
The patent segments the pump housing into modular components with standardized interfaces, allowing independent replacement and reconfiguration of gear assemblies, seals, and accessories. This segmentation enables field adaptability while maintaining core pumping productivity, as components can be swapped to accommodate different asphalt grades, temperatures, and flow requirements without redesigning the entire system.
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 system effectively reduces fluid pulsations and cavitation, enhancing pumping performance, safety, and adaptability, while maintaining efficient operation and accuracy in metering, even at elevated temperatures.
Implementation Method 1
at least one shaft-driven fluid displacer comprising a first helical gear operably coupled to a driveshaft and a second helical gear meshing with the first helical gear and having an axis spaced from and parallel to an axis of the first helical gear
Implementation Method 2
a first fluid return passage returning the viscous molten fluid from the discharge-pressure region to the suction-pressure region
Implementation Method 3
a control valve to control passage of the viscous molten fluid between the first return inlet and the first return outlet
Data Source
AI summary
A modular symmetrical asphalt pumping system providing a series of field-configurable gear pumps and meters usable to safely and efficiently pump viscous molten fluids, such as, asphalt and similar bituminous materials. The system utilizes highly symmetrical physical geometries and modular components to allow for the development of multiple pump configurations using a reduced quantity of parts. Preferred arrangements of the system reduce pump pulsing and cavitation.