Two-Stage Electromagnetic Pumping for High-Pressure Liquid Metal Jets
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Solution Overview
Problem
Conventional electromagnetic pumps are inadequate for achieving the high pressures required for liquid metal jet X-ray sources, as they are limited by gravity-induced pressure and conduit diameter, leading to insufficient jet velocity and pressure.
Innovation Solution
A two-stage pumping scheme is employed, where a first stage electromagnetic pump with a larger inlet diameter is fed by gravitational pressure, and a second stage pump with a narrower conduit diameter achieves the required high pressure, with the two pumps connected via a feeding conduit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a single electromagnetic pump with narrow conduit is used to achieve high pressure, then pressure can be increased, but gravitational pressure becomes insufficient to feed the pump
Solution Approach 1:
The pumping system is divided into two stages: a first electromagnetic pump with a larger diameter conduit that can be fed by gravitational pressure, and a second electromagnetic pump with a smaller diameter conduit that achieves the required high pressure. This segmentation allows each pump to operate within its optimal pressure and flow range, resolving the contradiction between gravitational feeding capability and pressure generation.
2Stress or pressure
If a narrow conduit is used in the electromagnetic pump, then pressure can be increased, but the inlet must be fed by more than just gravitational pressure
Solution Approach 1:
The system uses a two-stage pumping arrangement where the first pump handles the flow rate requirement with a larger conduit, and the second pump handles the pressure requirement with a smaller conduit. This resolves the contradiction between maintaining sufficient flow rate and achieving high final pressure.
Solution Approach 2:
The first electromagnetic pump acts as an intermediary device that prepares the liquid metal by providing initial pressurization and flow control, enabling the second pump to achieve the required high pressure without being overwhelmed by flow rate requirements.
3Device complexity
If conventional electromagnetic pumps are used, then the system is simple, but pressures up to several hundreds of bar cannot be achieved
Solution Approach 1:
Instead of using a single complex high-pressure pump, the system segments the pressure generation into two stages, achieving several hundreds of bar pressure through series connection of two pumps with different conduit diameters.
Solution Approach 2:
The pumping system is configured with the first pump feeding into the second pump in a nested arrangement, where the output of the first pump becomes the input of the second pump, enabling progressive pressure build-up to achieve the required high pressures.
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 configuration allows for a significant increase in pressure, enabling the production of high-velocity liquid metal jets necessary for X-ray sources, while maintaining a compact and efficient pumping system.
Implementation Method 1
The raising of the pressure in the electrically conductive liquid metal may be achieved by a magnetic force resulting from the interaction between a magnetic field and an electric current flowing through the liquid
Implementation Method 2
The raising of the pressure in the electrically conductive liquid metal may be achieved by a magnetic force resulting from the interaction between a magnetic field and an electric current flowing through the liquid
Implementation Method 3
The inlet pressure to the first pump is provided by gravity by means of a difference in height between the reservoir and the first pump inlet
Data Source
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AI summary
An arrangement for providing a liquid metal jet in a vacuum environment is provided. The arrangement comprises a vacuum chamber; a nozzle arranged to provide the liquid metal jet; a jet receiver comprised within the vacuum chamber and arranged to receive liquid metal from the liquid metal jet; a first electromagnetic pump section comprising a first inlet and a first outlet, the first inlet having a first diameter; a second electromagnetic pump section comprising a second inlet and a second outlet, and a pumping conduit connecting the second inlet to said second outlet, the pumping conduit having a second diameter; wherein the first outlet is arranged to provide liquid metal to the second inlet. The first diameter is at least 1.8 times as large as the second diameter. A corresponding method is also provided.