CN210136837U

CN210136837U - Large-angle beryllium window output X-ray tube anode structure and X-ray tube

Info

Publication number: CN210136837U
Application number: CN201921127414.5U
Authority: CN
Inventors: 王奇志; 卓琳; 徐陈勇; 任翔
Original assignee: First Research Institute of Ministry of Public Security; Beijing Zhongdun Anmin Analysis Technology Co Ltd
Current assignee: First Research Institute of Ministry of Public Security; Beijing Zhongdun Anmin Analysis Technology Co Ltd
Priority date: 2019-07-18
Filing date: 2019-07-18
Publication date: 2020-03-10
Anticipated expiration: 2029-07-18

Abstract

The utility model discloses a wide-angle beryllium window output X-ray tube anode structure. The anode structure comprises an anode cap, a beryllium window and an anode target assembly, wherein the anode cap is connected with the anode target assembly; the beryllium window is connected with the anode cap. The anode structure adopts the beryllium window with the strip-shaped structure, and the anode cap and the beryllium window are reliably pressed, so that the problem of high attenuation when the existing X-ray tube adopts a copper window to pass through X-rays is solved, and the performance of X-ray inspection equipment is improved; the output of the X-ray large radiation angle can be realized, and the requirement of the X-ray inspection equipment on the X-ray large radiation angle is met.

Description

Large-angle beryllium window output X-ray tube anode structure and X-ray tube

Technical Field

The utility model relates to a wide-angle beryllium window output X-ray tube anode structure also relates to the X-ray tube that includes this X-ray tube anode structure simultaneously.

Background

The X-ray tube is a vacuum diode operating at high voltage. The X-ray tube comprises an anode and a cathode, which are respectively used for receiving a target material bombarded by electrons and a filament for emitting the electrons. When the tungsten filament is passed through sufficient current to produce a cloud of electrons, and sufficient voltage (in the order of kilovolts) is applied between the anode and cathode to draw the cloud of electrons toward the anode. At the moment, electrons impact the tungsten target in a high-energy high-speed state, the high-speed electrons reach the target surface, the motion is suddenly stopped, and a small part of the kinetic energy of the electrons is converted into radiation energy and is emitted in the form of X rays.

The anode structure of the existing X-ray tube generally adopts a beryllium window or a metal copper window. As shown in fig. 1A and 1B, the metallic beryllium window 101 has a circular structure, so that the X-ray radiation angle is less than 90 degrees; furthermore, since the metallic beryllium material is usually pressed by powder metallurgy, the material is brittle, the ductility is poor, and the bending processing is difficult, so that the emission angle of the X-ray output through the beryllium window is difficult to exceed 90 degrees, and the use requirement of the X-ray inspection equipment with large radiation angle cannot be met.

As shown in fig. 2, the copper window and the anode are integrated, and the X-ray exit is a circumferential structure; in addition, metal copper has large inherent filtering, so that X-rays are greatly attenuated after passing through a copper window (low-energy X-ray filtering), the X-ray energy spectrum distribution is greatly influenced, and the performance detection of the X-ray inspection equipment is influenced.

Disclosure of Invention

The utility model aims to solve the primary technical problem of providing a large-angle beryllium window output X-ray tube anode structure.

Another technical problem to be solved by the present invention is to provide an X-ray tube including the anode structure of the wide-angle beryllium window output X-ray tube.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

according to a first aspect of embodiments of the present invention, there is provided a large angle beryllium window output X-ray tube anode structure, comprising an anode cap, a beryllium window, and an anode target assembly, wherein the anode cap is connected to the anode target assembly; the beryllium window is connected with the anode cap; the beryllium window is of a strip structure.

Wherein preferably, the outer diameter of the anode cap is not less than 40 mm.

Preferably, the length of the strip-shaped structure is not more than the outer diameter dimension of the anode cap, and the length of the strip-shaped structure is not less than 30 +/-5 mm.

Preferably, the periphery of the beryllium window is in a fillet structure.

Preferably, the outer surface of the anode cap is in a rounded structure.

Preferably, the end of the anode cap is of a conical structure.

Preferably, the exit window of the anode cap has a long strip-shaped stepped groove structure.

According to a second aspect of the embodiments of the present invention, there is provided an X-ray tube, comprising a cathode structure, a glass envelope and the above-mentioned large-angle beryllium window output X-ray tube anode structure.

The anode structure of the large-angle beryllium window output X-ray tube provided by the utility model adopts the beryllium window with the long strip structure, and the anode cap and the beryllium window are reliably pressed, thereby not only avoiding the problem of large attenuation when the existing X-ray tube adopts the copper window to pass the X-ray, but also improving the performance of the X-ray inspection equipment; the output of the X-ray large radiation angle can be realized, and the requirement of the X-ray inspection equipment on the X-ray large radiation angle is met.

Drawings

Fig. 1A and 1B are schematic diagrams illustrating an anode structure of a conventional X-ray tube using a beryllium window;

FIG. 2 is a schematic diagram of an anode structure of a conventional X-ray tube using a copper window;

fig. 3 is a cross-sectional view of the anode structure of the wide-angle beryllium window output X-ray tube provided by the present invention;

fig. 4 is a schematic structural view of a beryllium window in the anode structure of the wide-angle beryllium window output X-ray tube provided by the present invention;

fig. 5 is a cross-sectional view of an anode cap in the anode structure of the wide-angle beryllium window output X-ray tube provided by the present invention;

fig. 6 is a cross-sectional view of an end of an anode cap in the anode structure of the wide-angle beryllium window output X-ray tube provided by the present invention, which adopts a tapered structure;

fig. 7 is a cross-sectional view of the anode cap showing a large radiation angle in the anode structure of the large-angle beryllium window output X-ray tube provided by the present invention.

Detailed Description

The technical content of the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 3, the anode structure of the wide-angle beryllium window output X-ray tube provided by the present invention comprises an anode cap 1, a beryllium window 2 and an anode target assembly 3, wherein the anode cap 1 and the anode target assembly 3 are fixed by vacuum brazing; the beryllium window 2 and the anode cap 1 are pressed and fixed through a special cutter tool.

As shown in fig. 4, the beryllium window 2 has a strip-shaped structure. The length of the strip-shaped structure is not less than 30 +/-5 mm, and the strip-shaped structure is used for matching and fixing the anode cap 1 and ensuring that the emergent angle of the X-ray output through the beryllium window 2 is not less than 100 degrees. In addition, in order to facilitate the assembly of the beryllium window 2 and the anode cap 1, the periphery of the beryllium window 2 can be provided with a rounded structure.

As shown in fig. 5, the outer diameter of the anode cap 1 is not less than 40mm, and in order to ensure that the exit angle of the X-ray output through the beryllium window 2 is not less than 100 degrees, the length of the beryllium window 2 in the strip structure is preferably not greater than the outer diameter of the anode cap 1. In order to avoid the point discharge during the operation of the X-ray tube, the outer surface of the anode cap 1 is preferably rounded.

In order to effectively reduce the probability of high-voltage discharge of the X-ray tube, reduce the electric field gradient distribution at the end of the anode cap 1, and improve the voltage withstanding property of the X-ray tube, as shown in fig. 6, the end of the anode cap 1 may adopt a tapered structure 11.

In order to enable the anode cap 1 to be in clearance fit with the beryllium window 2 with a long strip structure, as shown in fig. 7, the exit window of the anode cap 1 can be in a long strip stepped groove structure 12, and the anode cap 1 and the beryllium window 2 can be reliably pressed together by a special tool, so that the output of the X-ray with a large radiation angle (not lower than 100 degrees) is ensured.

The utility model also provides an X-ray tube. The X-ray tube comprises the anode structure, the cathode structure and the glass shell of the large-angle beryllium window output X-ray tube. The cathode structure and the glass bulb have the same structure as the cathode structure and the glass bulb of the conventional X-ray tube, and are not described in detail herein.

The following conclusions can be obtained through tests: the anode structure of the large-angle beryllium window output X-ray tube is adopted to respectively manufacture 160kV and 250kV large-angle beryllium window output X-ray tubes; the test result shows that: the X-ray tube not only can output X-rays with the emergent angle not less than 100 degrees, but also can ensure the continuous and stable work of the X-ray tube.

The anode structure of the wide-angle beryllium window output X-ray tube and the X-ray tube provided by the present invention are explained in detail above. Any obvious modifications to the device, which would be obvious to those skilled in the art, without departing from the essential spirit of the invention, are intended to be covered by the appended claims.

Claims

1. An anode structure of a large-angle beryllium window output X-ray tube is characterized by comprising an anode cap, a beryllium window and an anode target assembly, wherein the anode cap is connected with the anode target assembly; the beryllium window is connected with the anode cap; the beryllium window is of a strip structure.

2. The high angle beryllium window output X-ray tube anode structure of claim 1, wherein:

the outer diameter of the anode cap is not less than 40 mm.

3. The high angle beryllium window output X-ray tube anode structure of claim 2, wherein:

the length of the strip-shaped structure is not more than the outer diameter of the anode cap, and the length of the strip-shaped structure is not less than 30 +/-5 mm.

4. The high angle beryllium window output X-ray tube anode structure of claim 1, wherein:

the periphery of the beryllium window is in a fillet structure.

5. The high angle beryllium window output X-ray tube anode structure of claim 1, wherein:

the outer surface of the anode cap adopts a fillet structure.

6. The high angle beryllium window output X-ray tube anode structure of claim 1, wherein:

the end of the anode cap adopts a conical structure.

7. The high angle beryllium window output X-ray tube anode structure of claim 1, wherein:

the exit window of the anode cap adopts a strip-shaped stepped groove structure.

8. An X-ray tube, characterized by comprising a cathode structure, a glass bulb and the anode structure of the high-angle beryllium window output X-ray tube as claimed in any one of claims 1 to 7.