Displacement Pump Priming Control With Variable Displacer Motion
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Solution Overview
Problem
Existing positive displacement pumps face inefficiencies in fluid displacement due to mechanical actuation and require complex mechanical systems for torque delivery, leading to operational limitations and increased complexity.
Innovation Solution
A pump system utilizing an electric motor with a stator and rotor to generate rotational output, converted into linear reciprocating motion by a drive mechanism, and controlled by a controller to regulate energy delivery for fluid displacement, allowing for distinct operating modes (priming and pumping) with varying speed, acceleration, and displacement profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If mechanical actuation is used to drive fluid displacement members, then the pump can provide sufficient torque during pumping, but the device complexity increases due to gear trains and external motor assemblies
Solution Approach 1:
The motor assembly is merged with the pump body to form an integrated unit, eliminating the need for separate external motor assemblies and gear trains. The motor is positioned within the pump housing, and its shaft is directly coupled to the fluid displacement member, combining previously separate components into a unified structure that reduces overall complexity while maintaining torque delivery capability
Solution Approach 2:
The gear train intermediary is extracted from the system. By directly coupling the motor shaft to the fluid displacement member, the patent removes the intermediate gear train that previously transmitted torque, thereby simplifying the mechanical system while still providing sufficient torque for pumping operations
2Adaptability or versatility
If a single operating speed is used for the pump, then the mechanical system is simpler, but the operational flexibility and efficiency across different operating conditions is reduced
Solution Approach 1:
The pump system transitions from a static single-speed operation to a dynamic variable-speed operation. The motor is controlled to vary its rotational speed based on operating conditions, allowing the pump to adapt to different flow and pressure requirements. This dynamic control enables optimized performance across varying operating conditions while maintaining a relatively simple control architecture
Solution Approach 2:
The operating speed parameter of the motor is made variable rather than fixed. By changing the speed parameter in response to different operating conditions, the pump achieves greater adaptability and efficiency. The controller adjusts the motor speed to match demand, providing operational flexibility without requiring complex mechanical adjustments
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
Enhances fluid displacement efficiency by optimizing fluid displacer movement profiles, reducing mechanical complexity, and improving operational flexibility and control over fluid flow.
Implementation Method 1
an electric motor comprising a stator and a rotor, the rotor configured to generate a rotational output
Implementation Method 2
a drive that converts the rotational output from the electric motor into a linear reciprocating motion
Data Source
AI summary
An electrically operated displacement pump includes an electric motor having a stator and a rotor. The rotor is connected to the fluid displacer to drive axial reciprocation of the fluid displacer. A controller controls operation of the motor based on an operating state of the motor to control pumping by the displacement pump. The controller is configured to operate the pump in a priming mode. during priming of the pump, and a pumping mode, during pumping of process fluid. The controller causes the fluid displacer to move differently in the priming mode than in the pumping mode.