Rotary Transmission Anode X-Ray Source for Small Focus Heat Dissipation
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Solution Overview
Problem
Existing X-ray sources, particularly transmission and reflecting types, face issues such as low power, low X-ray flux, long imaging time, large focus size, small X-ray emission angle, low imaging resolution, and poor image quality, along with instability due to magnetic fields affecting electron beam trajectories.
Innovation Solution
A rotary-transmission-target microfocus X-ray source is developed, featuring a chamber with an electron beam system, a rotary anode target system, and a cooling system, where the electron beam is focused onto a rotating anode target using a bevel gear transmission device and high-precision motor, and a cooling system is used to enhance heat dissipation and imaging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a transmission target X-ray source is used to obtain smaller focus size and larger radiation angle, then imaging resolution and X-ray emission angle are improved, but the heat dissipation volume is limited and the system cannot withstand high voltage accelerated electrons
Solution Approach 1:
The patent applies the dynamics principle by rotating the anode target at high speed (e.g., 3000 rpm) to dynamically distribute the electron beam impact across different regions of the anode surface. This rotation enables continuous heat dissipation while maintaining a small stationary focus spot, resolving the contradiction between small focus size and adequate heat dissipation volume.
Solution Approach 2:
The patent introduces the time dimension through anode rotation, transforming the static heat dissipation problem into a dynamic one. By adding rotational motion, the effective heat dissipation volume increases without compromising the small focal spot size, as different anode regions sequentially occupy the impact position.
2Temperature
If a reflecting target X-ray source with inclined target surface is used to withstand high voltage accelerated electrons, then heat dissipation volume is increased, but the focus size becomes large and radiation angle becomes small
Solution Approach 1:
The patent changes the key parameter of anode target orientation from inclined (reflecting type) to vertical (transmission type). This parameter change allows the electron beam to strike the anode perpendicularly, creating a small focal spot while the rotation and cooling systems handle the heat dissipation, thus achieving both small focus size and adequate heat management.
3Manufacturing precision
If the electron beam is focused to a small spot size to improve imaging resolution, then imaging resolution and X-ray flux are improved, but the heat concentration increases and requires more effective cooling
Solution Approach 1:
The patent uses dynamic rotation of the anode target to distribute the concentrated heat from the small electron beam focus across multiple anode regions. The rotation speed is optimized so that each region receives electron beam impact for a limited time, allowing heat to dissipate while maintaining high X-ray flux from the concentrated focus.
Solution Approach 2:
The patent introduces a water cooling system as an intermediary between the anode target and the heat generated by electron beam bombardment. The cooling channels are positioned close to the anode target surface, providing efficient heat removal from the high-concentration heat source without affecting the electron beam focus or X-ray generation.
4Temperature
If a rotary anode target system with motor and bevel gear transmission is used to increase heat dissipation, then heat dissipation capability is improved, but magnetic fields from the motor may affect electron beam trajectory stability
Solution Approach 1:
The patent extracts the magnetic field source (motor) from the vacuum chamber environment where the electron beam operates. By placing the motor outside the vacuum chamber and using only the mechanical rotation through the vacuum wall, the harmful magnetic fields are kept separate from the electron beam path, maintaining trajectory stability while still achieving anode rotation for heat dissipation.
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 design improves imaging resolution, X-ray flux, and brightness, reducing imaging time by focusing the electron beam to a small spot size, increasing the X-ray emission angle, and maintaining system stability through effective heat dissipation and vacuum sealing, thereby overcoming the limitations of existing X-ray sources.
Implementation Method 1
an electron beam emitted by the electron beam system vertically bombards a metal target of the rotating anode target
Implementation Method 2
converting the bombardment energy of the electron beam into heat energy and X-rays
Implementation Method 3
the cooling system is configured to cool the anode target
Implementation Method 4
a water cooling and circulating machine is connected with the cooling chamber and circulates the cooling medium
Implementation Method 5
a first focusing lens and a second focusing lens are sequentially installed at a rear end of the channel member, a third focusing lens is installed at a front end of the channel member
Data Source
AI summary
A rotary-transmission-target microfocus X-ray source and an X-ray generation method based on the rotary-transmission-target microfocus X-ray source are provided. The X-ray source comprises a chamber, and an electron beam system is installed in the chamber. The electron beam system is arranged on a same side as an anode target rotating shaft. A motor in a rotary anode target system drives an anode target to rotate through a bevel gear transmission device. The microstructure of a target is designed. An electron beam emitted by the electron beam system vertically bombards the metal target of the rotating anode target. A cooling system is configured to cool the anode target.