Synchronized Oscillating Pumps for Constant Flow
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Solution Overview
Problem
Oscillating displacement pumps often experience pressure pulsations in the delivery line due to variable flow rates, which require additional damping measures and significant design efforts to achieve a constant flow, and existing methods still result in interruptions during the suction stroke, failing to maintain continuous fluid delivery.
Innovation Solution
The method involves operating at least two oscillating displacement pumps electronically synchronized without mechanical coupling, using highly dynamic drive motors like servo motors to superimpose flow rates and achieve a constant total flow rate, preventing pressure pulsations in the delivery line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If oscillating displacement pumps are used to generate fluid flow, then fluid delivery is achieved, but pressure pulsations occur in the delivery line due to variable flow rates
Solution Approach 1:
The patent combines multiple oscillating displacement pumps (at least two) to operate in parallel, merging their individual flow outputs. By synchronizing the pumps so that one is on its delivery stroke while another is on its suction stroke, the combined flow becomes substantially constant, eliminating pressure pulsations in the delivery line.
Solution Approach 2:
The patent utilizes periodic operation of multiple pumps with different phase angles. Each pump operates periodically on delivery and suction strokes, and by coordinating these periodic actions with appropriate phase differences, the system achieves continuous constant flow without pulsations.
2Stability of the object's composition
If additional pulsation dampers are added to suppress pressure pulsations, then flow constancy is improved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the need for additional pulsation dampers by using multiple synchronized pumps. The flow constancy is achieved through the pumping system itself rather than requiring separate damping devices, thereby reducing overall device complexity while maintaining flow stability.
Solution Approach 2:
The patent replaces the mechanical pulsation damping system with an electronically controlled multi-pump synchronization system. By using electronic control to coordinate pump operations, the system achieves flow constancy without mechanical dampers, reducing complexity.
3Device complexity
If single pump design is used, then device simplicity is maintained, but flow rate pulsation remains significant
Solution Approach 1:
The patent divides the pumping function into multiple separate pump units operating in parallel. Each pump is relatively simple in design, but collectively they produce constant flow. This segmentation allows maintaining simplicity of individual components while achieving stability of overall system performance.
Data Source
Figure 1
Figure 2a~2d
Figure 3a~3c
AI summary
In a method for equalizing the flow rate of oscillating positive displacement pumps, which are driven by a drive motor via a rotating shaft, the fluid flow in a delivery line (5) is generated by at least two oscillating positive displacement pumps (1, 2), whose drive motors (6, 7) are controlled such that the total flow rate generated in the delivery line (5) is largely uniform or constant. The device provided for carrying out this method according to the invention is characterized by at least two oscillating positive displacement pumps (1, 2), whose pressure line (3, 4) is connected to a common delivery line (5) for superimposing the individual flow rates, and which each have a drive motor (6, 7) that can be operated electronically synchronized without mechanical coupling to achieve a largely uniform or constant total flow rate.