CN115527822A

CN115527822A - Novel electron collector structure for X-ray tube

Info

Publication number: CN115527822A
Application number: CN202110714032.8A
Authority: CN
Inventors: 谷胜栋
Original assignee: Corona Medical Devices Shanghai Co ltd
Current assignee: Corona Medical Devices Shanghai Co ltd
Priority date: 2021-06-25
Filing date: 2021-06-25
Publication date: 2022-12-27

Abstract

The invention discloses a novel electron collector structure for an X-ray tube, which comprises an anode target disc, wherein an electron collector is arranged at the upper end of the anode target disc, a cathode is arranged at the upper end of the electron collector, and an electron beam track is generated between the electron collector and the cathode. This a novel electron collector structure for X-ray tube, design the electron collector into bowl form structure, the electron collector can reduce the heat deposit on the positive pole target dish and produce mixed and disorderly X ray, the inboard arc surface of bowl form structure can improve back scattered electron collection efficiency simultaneously, can not produce too big influence to the electron beam focus yet, the bombardment that back scattered electron can be accepted on the surface of high temperature resistant lining layer is unlikely to melt, form a good overall structure of contact with electron collector high temperature resistant lining layer and electron collector through the welded mode simultaneously, can increase substantially the thermal power density that X-ray tube electron collector can bear, thereby improve X-ray tube's power and life-span.

Description

Novel electron collector structure for X-ray tube

Technical Field

The invention relates to the technical field of X-ray tubes, in particular to a novel electronic collector structure for an X-ray tube.

Background

The X-ray tube is a vacuum electronic device which utilizes high-speed electrons to impact a metal target surface to generate X-rays, and can be divided into a gas tube and a vacuum tube according to the mode of generating electrons, the X-ray tube comprises an anode and a cathode, the anode and the cathode are respectively used for receiving a target material bombarded by the electrons and a filament for emitting the electrons, the two electrodes are sealed in a high-vacuum glass or ceramic shell, a power supply part of the X-ray tube at least comprises a low-voltage power supply for heating the filament and a high-voltage generator for applying high voltage to the two electrodes, when the tungsten filament generates an electron cloud through enough current and enough voltage (kilovolt level) is applied between the anode and the cathode, the electron cloud is pulled to the anode, the electrons impact the tungsten target in a high-energy and high-speed state, the high-speed electrons reach the target surface, the motion is suddenly stopped, a small part of the electron cloud is converted into radiation energy, the radiation energy is emitted in the form of the X-rays, the radiation generated in the form is called bremsstrahlung radiation, the magnitude of the current of the filament can be changed to change the temperature of the electron and the emission quantity of the electrons, thereby changing the intensity of the current of the tube and the intensity of the X-ray tube, and changing the intensity of the target material, and the intensity of the high-ray tube, and the intensity of the high-energy of the target material, and the high-energy of the X-ray tube can be forced radiation.

However, the existing X-ray tube lacks an electron collector which is stable and high temperature resistant, so that the back-scattered electrons will still bombard the anode finally, the generated heat is deposited on the anode assembly, meanwhile, along with the out-of-focus radiation, useless disordered X-rays are generated, meanwhile, the melting point of some materials with high thermal conductivity is not necessarily high, and when the back-scattered electrons bombard the electron collector, the local temperature is too high, even exceeds the melting point of the materials, so that evaporation is caused, the structure is unstable, even the vacuum leakage is caused, and the practicability is greatly reduced.

Disclosure of Invention

The invention aims to provide a novel electron collector structure for an X-ray tube, which solves the problems that the prior X-ray tube proposed in the background art lacks a stable high-temperature-resistant electron collector, so that backscattered electrons finally bombard an anode, generated heat is deposited on an anode assembly, and useless messy X rays are generated along with out-of-focus radiation, and meanwhile, the melting point of some materials with high heat conductivity is not necessarily high, so that the backscattered electrons bombard the electron collector, local overhigh temperature and even higher than the melting point of the materials can be caused, evaporation and unstable structure and even vacuum leakage can be caused, and the practicability is greatly reduced.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a novel electron collector structure for X-ray tube, includes the positive pole target disc, the upper end of positive pole target disc is provided with the electron collector, the outside of electron collector is provided with electron collector high temperature resistant lining layer, the upper end of electron collector is provided with the negative pole, produce the electron beam orbit between electron collector and the negative pole.

Preferably, the electron collector is designed to be of a bowl-shaped structure, so that the back scattering electron collecting efficiency is improved, and the electron beam focus cannot be greatly influenced.

Preferably, the high-temperature-resistant lining layer of the electron collector is made of a tungsten material, so that the high-temperature-resistant effect is improved.

Preferably, the high-temperature-resistant lining layer of the electron collector is designed to be a bowl-shaped structure, and the electron collector and the high-temperature-resistant lining layer of the electron collector are connected in a welding mode to form an integral structure with good contact, so that heat dissipation is facilitated.

Compared with the prior art, the invention has the beneficial effects that:

1. this a novel electron collector structure for X-ray tube through the setting of electron collector, designs the electron collector into bowl structure, and the electron collector can reduce the heat deposit on the positive pole target dish and produce mixed and disorderly X ray, and the inboard arc surface of bowl structure can improve back scattered electron collection efficiency simultaneously, also can not produce too big influence to the electron beam focus.

2. This a novel electron collector structure for X-ray tube, setting through the high-temperature-resistant lining layer of electron collector, the bombardment that the surface of high-temperature-resistant lining layer can accept the back scattered electron is unlikely to melt, be favorable to the heat dissipation of collector, be unlikely to collector bulk temperature too high, form a good overall structure of contact with electron collector high-temperature-resistant lining layer and electron collector through the welded mode simultaneously, be favorable to the heat dissipation, can increase substantially the thermal power density that X-ray tube electron collector can bear, thereby improve X-ray tube's power, improve window or X-ray tube's life-span.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic perspective view of an electron collector according to the first embodiment of the present invention;

fig. 3 is a schematic perspective view of an electron collector according to a second embodiment of the present invention.

In the figure: 1. an anode target disk; 2. an electron collector; 3. an electron collector refractory lining; 6. a cathode; 7. the electron beam trajectory.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides the following technical solutions: a novel electron collector structure for an X-ray tube comprises an anode target disk 1, wherein an electron collector 2 is arranged at the upper end of the anode target disk 1, an electron collector high-temperature-resistant lining layer 3 is arranged on the outer side of the electron collector 2, a cathode 6 is arranged at the upper end of the electron collector 2, and an electron beam track 7 is generated between the electron collector 2 and the cathode 6;

electron collector 2 adopts bowl form structural design, improves back scattered electron collection efficiency, can not produce too big influence to the electron beam focus, and electron collector high temperature resistant lining layer 3 adopts the tungsten material, improves high temperature resistant effect, and electron collector high temperature resistant lining layer 3 adopts bowl form structural design, and welded connection between electron collector 2 and the electron collector high temperature resistant lining layer 3 forms a well integrated configuration of contact, is favorable to the heat dissipation.

The working principle is as follows: firstly, in the process of bombarding the anode target disk 1 by X-rays, only a small part of electron energy is converted into X-rays, most of the energy is converted into heat, about half of the energy converted into the heat electron energy is taken away and deposited by backscattered electrons, electron beams bombard the anode target disk 1 and can be backscattered, the backscattered electrons are finally converted into heat, the backscattered electron collection efficiency can be improved by the bowl-shaped electron collector 2, the focus of the electron beams can not be greatly influenced, the heat deposition on the anode target disk 1 and the generation of disordered X-rays can be reduced, meanwhile, the heat generated in the process of bombarding the anode target disk 1 by the X-rays can pass through the high-temperature resistant lining layer 3 of the electron collector, the surface of the high-temperature resistant lining layer 3 of the electron collector can accept the bombardment of the backscattered electrons to be not melted, the heat dissipation of the collector is facilitated, the integral temperature of the collector is not too high, and the power and the service life of the X-ray tube are improved.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A novel electron collector structure for X-ray tubes, comprising an anode target disk (1), characterized in that: the electron collector is characterized in that an electron collector (2) is arranged at the upper end of the anode target disc (1), an electron collector high-temperature-resistant lining layer (3) is arranged on the outer side of the electron collector (2), a cathode (6) is arranged at the upper end of the electron collector (2), and an electron beam track (7) is generated between the electron collector (2) and the cathode (6).

2. A novel electron collector structure for an X-ray tube according to claim 1, wherein: the electron collector (2) is designed in a bowl-shaped structure.

3. A novel electron collector structure for an X-ray tube according to claim 1, wherein: the high-temperature-resistant lining layer (3) of the electron collector is made of tungsten materials.

4. A novel electron collector structure for an X-ray tube according to claim 1, wherein: the high-temperature-resistant lining layer (3) of the electron collector is designed in a bowl-shaped structure, and the electron collector (2) is connected with the high-temperature-resistant lining layer (3) of the electron collector in a welding mode.