Valveless Variable Displacement Pump Using Electromagnetic Actuation
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Solution Overview
Problem
Conventional pumping systems for engine injection applications are not weight optimal and suffer from reliability issues due to moving components like worn-out bearings and clogged/leaking valves, necessitating a highly accurate, reliable, and compact variable displacement pumping system.
Innovation Solution
A pump assembly featuring a stator assembly with rotary and linear windings and a piston assembly that translates and rotates within the stator, eliminating moving parts by using electromagnetic interactions to create a pumping action, driven by a waveform from a controller for precise displacement control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pumps with motor and moving components are used, then pumping function is achieved, but reliability decreases due to worn-out bearings and clogged/leaking valves
Solution Approach 1:
The patent removes all moving components including bearings, valves, and traditional motor mechanisms from the pumping system. The extraction of these problematic elements eliminates the sources of wear, clogging, and leakage, directly resolving the reliability issue while reducing device complexity.
Solution Approach 2:
The patent replaces the traditional mechanical pumping system with an electromagnetic field-based system. The linear winding and rotary winding generate electromagnetic forces that act on the piston assembly without mechanical contact, eliminating moving parts and their associated reliability problems.
2Weight of moving object
If conventional motor-mounted pump design is used, then pumping function is achieved, but weight optimization is poor
Solution Approach 1:
The patent merges the motor function and pump function into a single integrated assembly. The stator assembly with windings serves both as the electromagnetic actuator and the pump housing, while the piston assembly serves both as the electromagnetic receiver and the pumping element, eliminating the need for separate motor and pump components.
Solution Approach 2:
By replacing the traditional mechanical motor with an electromagnetic field-based actuation system, the patent eliminates heavy mechanical components such as motor housings, shafts, and couplings, significantly reducing the overall weight of the moving object.
3Measurement precision
If variable displacement control is implemented, then metering accuracy is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic control of displacement by varying the amplitude and frequency of the waveform applied to the windings. This allows real-time adjustment of piston translation distance and rotation speed, enabling precise metering control without adding mechanical complexity such as variable geometry mechanisms or additional control valves.
Solution Approach 2:
The patent controls variable displacement by changing electrical parameters (waveform amplitude and frequency) rather than mechanical parameters. By adjusting the waveform characteristics, the system achieves precise metering control while keeping the mechanical structure simple and valve-free.
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 solution increases system reliability, compactness, and accuracy, providing infinite variable displacement with precise metering, reducing the need for commutation sensors and enhancing overall performance.
Implementation Method 1
The linear winding translates the piston assembly along a lengthwise axis of the stator assembly
Implementation Method 2
The rotary winding rotates the piston assembly about the lengthwise axis
Data Source
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AI summary
A pump assembly is provided. The pump assembly includes a stator assembly (101) and a piston assembly (102). The stator assembly includes a rotary winding (105) and a linear winding (106). The piston assembly is positioned within the stator assembly. The piston assembly translates along a lengthwise axis of the stator assembly and rotates about the lengthwise axis of the stator assembly to create a pumping action.