WO2025030646A1 - Shielding window assembly between inner and outer shells and applicable to x-ray source, and x-ray source - Google Patents

Abstract

The present invention provides a shielding window assembly between inner and outer shells and applicable to an X-ray source, and an X-ray source. The shielding window assembly comprises: a mounting box, which comprises a box shell; a vacuum tube, which is provided with a tube opening allowing X-rays to be emitted thereout and aligned with a box opening; and a shielding tube, an inner end opening thereof being tightly connected to and in communication with the tube opening, and an outer tube opening thereof being tightly connected to and in communication with the box opening, wherein an airtight window piece is provided in the shielding tube, and the airtight window piece is configured to make the space located on the inner side of the airtight window piece form a vacuum area and make the space located on the outer side of the airtight window piece form a non-vacuum area. By means of the present invention, X-rays generated by an anode assembly are not scattered on an emission path by an insulating medium of an X-ray source, and ineffective X-rays and stray X-rays generated by the anode assembly also do not enter the insulating medium of the X-ray source, thereby improving the intensity of the X-rays, enhancing the imaging quality of an X-ray complete machine system, and reducing the thickness requirements for a box shielding layer of the X-ray source; in addition, the radiation to humans can also be reduced.

Description

Inner and outer shell shielding window assembly suitable for X-ray source and X-ray source Technical Field

The invention relates to the technical field of X-ray equipment, and in particular to an inner and outer shell shielding window assembly suitable for an X-ray source and an X-ray source.

Background Art

An X-ray tube is a high-voltage, high-vacuum electronic device with an electron emitter. Electrons are emitted from the electron emitter and then accelerated by a high-voltage electric field of tens or hundreds of kilovolts between the cathode and the anode to form an electron beam, which finally bombards the anode target to produce X-rays. An X-ray tube usually includes a cathode with an electron emitter, an anode for generating X-rays and dissipating heat, and a tube shell for insulation and vacuum packaging.

In the integrated X-ray source or so-called Monoblock X-ray source on the market, the X-rays generated from the anode target leave the X-ray tube through the window of the anode sleeve and the tube sleeve. On the path after leaving the X-ray tube, when the X-rays encounter insulating media such as insulating oil, X-ray source windows and other materials, photoelectric effect, Compton effect or electron pair effect occurs with their atoms, and a large number of stray X-rays in various directions are generated. These stray X-rays will cause attenuation and damage of high-voltage circuit components and insulating components in the X-ray source, as well as an increase in the thickness of the shielding layer structure, resulting in a decrease in the life of the X-ray source and an increase in weight, and will also cause a decrease in the imaging quality of the X-ray system. In addition, the invalid X-rays generated by the anode target and the stray X-rays generated by the overflow electrons from the target surface will also enter the X-ray source insulating liquid, causing scattering in various directions, which will also cause attenuation and damage of high-voltage circuit components and insulating components in the X-ray source, as well as an increase in the thickness of the shielding layer structure, resulting in a decrease in the life of the X-ray source and an increase in weight.

Existing patents (JP2020087727A, JP202091970A and JP2019133872A) respectively disclose an X-ray tube with a lateral X-ray transmission component. These X-ray tubes with lateral transmission windows either use a flexible structure to adjust the position of the window and the focus, or are specially arranged at the cathode component to produce a deflected focus to expand the beam angle, or protective materials are arranged in the beryllium welding area of the lateral window to improve corrosion resistance. Although this type of X-ray transmission component can prevent the effective X-rays generated by the anode target from entering the X-ray imaging system directly from the lateral window without passing through insulating media such as insulating oil, the functions of the components and structural settings of this type of X-ray transmission component are only to form a vacuum airtight space, and there is no X-ray shielding function, so it cannot prevent the invalid X-rays generated by the anode target and the stray X-rays generated by the overflow electrons from the target surface from entering the X-ray source insulating liquid, causing scattering in various directions, thereby causing attenuation and damage of high-voltage circuit components and insulating devices in the X-ray source, and an increase in the thickness of the shielding layer structure.

Summary of the invention

In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide an inner and outer shell shielding window assembly and an X-ray source suitable for an X-ray source, which can shield the invalid X-rays and stray X-rays generated by the anode assembly. The X-rays do not enter the insulating medium of the X-ray source, and the effective X-rays generated are not affected by the attenuation and scattering caused by the insulating medium of the X-ray source on the emission path, thereby reducing the generation of stray X-rays on the emission path, improving the X-ray intensity, and improving the imaging quality of the entire X-ray system. At the same time, the thickness requirement of the shielding layer of the X-ray source box is reduced, and the risk of high-voltage ignition between the shielding tube and the anode assembly including the anode sleeve when the X-ray tube is working can be prevented. In addition, the radiation to humans can be reduced.

In order to solve the above technical problems, the present invention provides a shielding window assembly between an inner and outer shell suitable for an X-ray source, comprising:

An installation box, the installation box comprising a box shell, the box shell being provided with a box body opening allowing X-rays to be emitted;

A vacuum tube is arranged in the inner cavity of the box shell, and is provided with a tube opening which allows X-rays to be emitted and is aligned with the box opening; a cathode assembly and an anode assembly spaced apart from the cathode assembly are arranged in the vacuum tube, and the anode assembly is provided with an anode sleeve with an X-ray outlet;

A shielding tube with X-ray shielding function, wherein the two ends of the shielding tube along its own axial direction are respectively an inner port facing the vacuum tube and an outer pipe opening facing the box shell, the inner port is air-tightly connected to the tube body opening to isolate the vacuum area inside the vacuum tube and the insulating medium between the vacuum tube and the installation box, and the outer pipe opening is liquid-tightly connected to the box body opening to prevent the insulating medium between the vacuum tube and the installation box from leaking out of the installation box, and an air-tight window piece is provided in the shielding tube, and the air-tight window piece is used to form the vacuum area in the inner space of the air-tight window piece and form a non-vacuum area in the outer space of the air-tight window piece.

Preferably, the shielding tube comprises a shielding tube body and a sealing ring, the sealing ring is sleeved inside the shielding tube body, and one end of the sealing ring close to the vacuum tube is airtightly connected to the opening of the tube body.

Preferably, one end of the shielding tube body protrudes from the sealing ring in a direction close to the vacuum tube by a length of 1-3 mm.

Preferably, the shielding tube further comprises an assembly ring, the assembly ring and the sealing ring are air-tightly connected and matched, and the assembly ring and the shielding tube body are liquid-tightly connected and matched; the airtight window piece is air-tightly arranged in the assembly ring.

Preferably, the shielding tube comprises a shielding tube body and a pipe mouth mounting piece, the pipe mouth mounting piece is liquid-tightly connected to the outer peripheral wall of the shielding tube body, and the pipe mouth mounting piece is detachably liquid-tightly connected to the box shell via a connecting assembly.

Preferably, the shielding tube includes a shielding tube body, which is made of an X-ray shielding material with high X-ray attenuation characteristics. The X-ray shielding material is one or a combination of tungsten, lead, bismuth, lead alloy, tungsten alloy, bismuth alloy and a polymer material containing metal oxides, and the metal element of the metal oxide is one of tungsten, lead and bismuth.

Preferably, the shielding tube comprises a shielding tube body, and the equivalent lead thickness of the shielding tube body is 2-10 mm.

Preferably, the shielding tube comprises a shielding tube body, and the shielding tube body has an anti-spark chamfer at an edge of a port close to the vacuum tube.

Preferably, the shielding tube comprises a shielding tube body, and the surface roughness of the shielding tube body is not greater than 0.6.

Preferably, the shielding tube comprises a shielding tube body, and when the shielding tube body is made of an electrical insulating material, a metal film is plated on its surface.

Preferably, a preset gap is formed between the shielding tube and the anode sleeve in the axial direction of the shielding tube, that is, a preset vacuum insulation distance is formed between the shielding tube and the anode sleeve through the tube wall of the vacuum tube and the partial vacuum area inside the vacuum tube, thereby preventing the risk of high-voltage sparks between the shielding tube and the anode assembly including the anode sleeve when the X-ray tube is working.

Preferably, the X-ray exit aperture of the shielding tube is larger than the X-ray exit aperture of the anode sleeve. By such an arrangement, the invalid X-rays and stray X-rays generated by the anode assembly and passing through the sleeve window are blocked and attenuated by the shielding tube of the shielding tube, and thus do not enter the insulating medium in the X-ray source box shell.

The present invention also provides an X-ray source, comprising:

The inner and outer shell shielding window assembly suitable for an X-ray source;

The box shielding layer is arranged on the surface of the box shell;

Insulating medium, the insulating medium is filled in the cavity defined by the box shell, the vacuum tube and the shielding tube;

And circuit components and solid insulation components integrated inside the installation box and immersed in the insulation medium.

As described above, the inner and outer shell shielding window assembly and the X-ray source of the present invention have the following beneficial effects: the box shell is provided with a box body opening that allows X-rays to be emitted, and the vacuum tube is provided with a tube body opening that allows X-rays to be emitted and is aligned with the box body opening, thus creating conditions for the direct emission of X-rays generated by the anode assembly. The main innovation of the inner and outer shell shielding window assembly of the present invention is: a shielding tube with an X-ray shielding function, the two ends of the shielding tube along its own axial direction are respectively an inner port facing the vacuum tube and an outer tube opening facing the box shell, the inner port is airtightly connected to the tube body opening, and the outer tube opening is liquid-tightly connected to the box body opening for sealing the insulating medium, and an airtight window is provided in the shielding tube, and the airtight window is used to form a vacuum area in the inner space of the airtight window and a non-vacuum area in the outer space of the airtight window. In this way, the effective X-rays generated by the anode assembly can be transmitted from the vacuum area to the non-vacuum area only through the airtight window without passing through the insulating medium of the X-ray source. In addition, more importantly, since the shielding tube is made of X-ray shielding material, the shielding tube can attenuate the invalid X-rays generated by the anode assembly and the stray X-rays generated by the target surface overflow electrons. The target surface overflow electrons can be one or a combination of backscattered electrons, secondary electrons and Auger electrons. Therefore, the shielding window assembly between the inner and outer shells of the X-ray source of the present invention can prevent the invalid X-rays and stray X-rays generated by the above-mentioned anode assembly from entering the insulating medium of the X-ray source, and also prevent the generated effective X-rays from being affected by the attenuation and scattering caused by the insulating medium of the X-ray source on the emission path, thereby reducing the generation of stray X-rays on the emission path, improving the X-ray intensity, and improving the imaging quality of the entire X-ray system. At the same time, it reduces the thickness requirements of the shielding layer of the X-ray source box, and prevents components such as high-voltage circuits immersed in the insulating medium from being irradiated by X-rays, thereby increasing the service life of the X-ray source, and can also prevent the shielding tube and the anode assembly including the anode sleeve from being generated when the X-ray tube is working. It can also reduce the risk of high-voltage sparks and reduce radiation to humans.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional view showing an assembly of a shielding window assembly between an inner and outer shell for an X-ray source.

FIG. 2 shows an assembly cross-sectional view of the shielding tube body, the sealing ring, the assembly ring and the pipe mouth mounting member.

FIG. 3 is an enlarged view of portion A in FIG. 2 .

Explanation of component numbers: 1 is an installation box; 11 is a box shell; 111 is a box opening; 12 is a box shielding layer; 13 is an insulating medium; 2 is a vacuum tube; 21 is a tube opening; 3 is a shielding tube; 31 is an inner port; 32 is an outer tube opening; 33 is an anti-spark chamfer; 34 is a shielding tube body; 4 is an airtight window piece; 41 is a vacuum area; 42 is a non-vacuum area; 5 is a sealing ring; 6 is an assembly ring; 7 is a tube opening mounting piece; 8 is a cathode assembly; 9 is an anode assembly; 91 is an anode handle; 92 is an anode target; 93 is an anode sleeve; 94 is a sleeve window piece.

DETAILED DESCRIPTION

The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

In FIG1 , the dotted line indicated by X1 is invalid X-ray, the dotted line indicated by X2 is stray X-ray generated by electrons overflowing from the target surface, and the dotted line indicated by X3 is valid X-ray.

Referring to FIG1 , the present invention provides an X-ray source, which includes an installation box 1 and an X-ray tube disposed inside the installation box 1, wherein the installation box 1 also integrates components such as a high-voltage generating circuit, an electron emitter driving circuit, and a solid insulating device (the high-voltage generating circuit, the electron emitter driving circuit, and the solid insulating device are not shown in the figure). The X-ray tube includes a vacuum tube 2, wherein a cathode assembly 8 capable of emitting an electron beam e and an anode assembly 9 bombarded by the electron beam e are disposed inside the vacuum tube 2. The anode assembly 9 includes an anode handle 91, an anode target 92 disposed at the end of the anode handle 91, and an anode sleeve 93 covering the anode target 92, wherein the anode sleeve 93 is provided with a sleeve window member 94 that allows X-rays to be emitted.

As shown in FIG. 1, FIG. 2 and FIG. 3, in order to prevent the effective X-ray X3 generated by the anode assembly 9 from being attenuated and scattered by the insulating medium 13 (such as insulating oil) of the X-ray source on the emission path, and to avoid the anode assembly 9 Invalid X-rays and stray X-rays generated by the component 9 enter the insulating medium 13 of the X-ray source. The present invention provides a shielding window component between an inner shell and an outer shell suitable for an X-ray source, comprising:

An installation box 1, the installation box 1 comprises a box shell 11, and the box shell 11 is provided with a box opening 111 allowing X-rays to be emitted;

A vacuum tube 2, which is disposed in the inner cavity of the box shell 11, and is provided with a tube opening 21 which allows X-rays to be emitted and is aligned with the box opening 111;

A shielding tube 3 with X-ray shielding function, the two ends of the shielding tube 3 along its own axis are respectively an inner port 31 facing the vacuum tube 2 and an outer pipe port 32 facing the box shell 11, the inner port 31 is air-tightly connected to the tube body opening 21 to isolate the vacuum area inside the vacuum tube 2 and the insulating medium 13 between the vacuum tube 2 and the installation box 1, the outer pipe port 32 is liquid-tightly connected to the box body opening 111 to prevent the insulating medium 13 between the vacuum tube 2 and the installation box 1 from leaking out of the installation box 1, an air-tight window piece 4 is provided in the shielding tube 3, the air-tight window piece 4 is used to form a vacuum area 41 in the inner space of the air-tight window piece 4 and to form a non-vacuum area 42 in the outer space of the air-tight window piece 4.

In the present invention, the box shell 11 (i.e., the outer shell structure) is provided with a box opening 111 that allows X-rays to be emitted, and the vacuum tube 2 (i.e., the inner shell structure) is provided with a tube opening 21 that allows X-rays to be emitted and is aligned with the box opening 111, thus creating conditions for the direct emission of X-rays generated by the anode assembly 9. Compared with the X-ray tube with X-ray transmission components disclosed in the relatively close existing patents (JP2020087727A, JP202091970A, and JP2019133872A), the main innovation of the inner and outer shell shielding window assembly suitable for the X-ray source of the present invention lies in the "X-ray shielding function" of the "shielding tube 3", that is, the shielding tube 3 completely prevents X-rays from entering the insulating medium 13 (the insulating medium 13 is generally an insulating liquid similar to insulating oil) located between the vacuum tube 2 and the mounting box 1 while ensuring that the X-rays are accurately emitted from the mounting box 1. Specifically, the two ends of the shielding tube 3 along its own axis are respectively an inner port 31 facing the vacuum tube 2 and an outer pipe opening 32 facing the box shell 11, the inner port 31 is airtightly connected to the tube body opening 21, so that the vacuum area inside the vacuum tube 2 and the insulating medium 13 between the vacuum tube 2 and the installation box 1 can be isolated, and the outer pipe opening 32 is liquid-tightly connected to the box body opening 111, so that the insulating medium 13 between the vacuum tube 2 and the installation box 1 can be prevented from leaking out of the installation box 1, and an airtight window member 4 is provided in the shielding tube 3, and the airtight window member 4 is used to form a vacuum area 41 in the inner space of the airtight window member 4 and a non-vacuum area 42 in the outer space of the airtight window member 4. In this way, the effective X-rays generated by the above-mentioned anode assembly 9 (see the dotted line indicated by X3 in FIG. 1) can be transmitted from the vacuum area 41 to the non-vacuum area 42 only through the airtight window member 4, and there is no need to pass through the insulating medium 13 of the X-ray source. More importantly, since the shielding tube 3 has an X-ray shielding function, the shielding tube 3 can completely shield the invalid X-rays generated by the anode assembly 9 (see the dotted line indicated by X1 in FIG. 1 ) and the stray X-rays generated by the electrons overflowing from the target surface (see the dotted line indicated by X2 in FIG. 1 ) inside the shielding tube 3, completely avoiding the invalid X-rays and stray X-rays from penetrating the insulating medium 13 between the vacuum tube 2 and the installation box 1, thereby effectively protecting the high-voltage generating circuit and the electron emitter integrated inside the installation box 1. Devices such as driving circuits and solid insulating devices increase the service life of the X-ray source. The target surface overflow electrons can be one or a combination of backscattered electrons, secondary electrons and Auger electrons.

That is to say, by configuring the above-mentioned shielding window assembly between the inner and outer shells suitable for the X-ray source, the above-mentioned X-ray source can allow the effective X-rays X3 generated by the above-mentioned anode assembly 9 to be emitted from the vacuum area 41 to the non-vacuum area 42 by only passing through the airtight window component 4, and no longer passing through the insulating medium of the X-ray source, thereby improving the intensity of the X-rays, reducing stray X-rays, thereby improving the imaging quality of the X-rays, and reducing the thickness requirement for the box shielding layer 12 of the X-ray source, while preventing components such as high-voltage circuits immersed in the insulating medium from being irradiated by X-rays, thereby improving the service life of the X-ray source.

Another point is that the vacuum tube 2 is provided with a cathode assembly 8 and an anode assembly 9 spaced apart from the cathode assembly 8, and the anode assembly 9 is provided with an anode sleeve 93 with an X-ray outlet, so as to prevent the risk of high-voltage ignition between the shielding tube and the anode assembly including the anode sleeve when the X-ray tube is working.

Therefore, the shielding window assembly between the inner and outer shells of the X-ray source of the present invention can prevent the X-rays generated by the above-mentioned anode assembly 9 from being affected by the attenuation and scattering caused by the insulating medium 13 of the X-ray source on the emission path, and prevent the invalid X-rays and stray X-rays generated by the above-mentioned anode assembly 9 from entering the insulating medium 13 of the X-ray source, reduce the generation of stray X-rays caused by the insulating medium 13 of the X-ray source, reduce the thickness requirement of the box shielding layer 12 of the X-ray source, improve the imaging quality of the entire X-ray system, and also increase the service life of the X-ray source. It can also prevent the risk of high-voltage ignition between the shielding tube and the anode assembly 9 including the anode sleeve 93 when the X-ray tube is working, and can also reduce radiation to humans.

Furthermore, in order to further reduce the risk of high-voltage ignition, a preset gap is formed between the shielding tube 3 and the anode sleeve 93 in the axial direction of the shielding tube 3, that is, a preset vacuum insulation distance is formed between the shielding tube 3 and the anode sleeve 93 through the tube wall of the vacuum tube 2 and the partial vacuum area inside the vacuum tube 2, thereby preventing the risk of high-voltage ignition between the shielding tube 3 and the anode assembly 9 including the anode sleeve 93 when the X-ray tube is working.

The X-ray exit aperture of the above-mentioned shielding tube 3 is larger than the X-ray exit aperture of the anode sleeve 93. By such an arrangement, the invalid X-rays X1 and stray X-rays X2 generated by the anode assembly 9 and passing through the sleeve window 94 are blocked and attenuated by the shielding tube 3 of the shielding tube, thereby further ensuring that the invalid X-rays X1 and stray X-rays X2 will not enter the insulating medium 13 in the X-ray source box shell 11.

The shielding tube 3 includes a shielding tube body 34, which can be made of a non-electrically insulating material, which is one or more of tungsten, lead, bismuth, lead alloy, tungsten alloy and bismuth alloy. The shielding tube body 34 can also be made of an electrically insulating material, which can be a polymer material containing an oxide of a high attenuation material, such as epoxy containing lead oxide or bismuth oxide. In this way, the invalid X-rays and stray X-rays generated from the anode assembly 9 are attenuated by the shielding tube body 34, that is, the invalid X-rays and stray X-rays are shielded in the tube cavity of the shielding tube body 34, thereby preventing the invalid X-rays and stray X-rays from entering the insulating medium 13.

As shown in FIG1 , in order to facilitate the sealed connection between the shielding tube 3 and the vacuum tube 2, the shielding tube 3 includes a shielding tube body 34 and a sealing ring 5. The sealing ring 5 is sleeved inside the shielding tube body 34. One end of the sealing ring 5 close to the vacuum tube 2 is airtightly connected with the tube body opening 21 to seal the vacuum area 41. The other end of the sealing ring 5 is airtightly connected with the step structure on the assembly ring 6, so that it can be used to seal the vacuum area 41. For example, one end of the sealing ring 5 is sealed with the tube body opening 21 by glass melting. The process is vacuum sealed, and the other end of the sealing ring 5 is vacuum sealed with the assembly ring 6 by brazing or argon arc welding; the sealing ring 5 is made of Kovar alloy.

As shown in FIG. 2 , in order to prevent sparking at the seal between the sealing ring 5 and the vacuum tube 2 relative to the anode assembly 9 and/or the cathode assembly 8, one end of the shielding tube body 34 protrudes from the sealing ring 5 in the direction close to the vacuum tube 2, for example, the protruding length L is 1-3 mm.

As shown in Fig. 2 and Fig. 3, in order to facilitate the installation of the above-mentioned airtight window member 4 inside the shielding tube 3, the shielding tube 3 further includes an assembly ring 6, the outer peripheral wall of the assembly ring 6 is liquid-tightly connected to the inner peripheral wall of the shielding tube body 34, so as to prevent the insulating medium 13 from leaking out of the installation box 1 through the gap between the shielding tube body 34 and the sealing ring 5; the above-mentioned airtight window member 4 is sealed in the assembly ring 6. The outer peripheral wall of the assembly ring 6 is stepped, and the assembly ring 6 has a first step portion, a second step portion and a third step portion with successively decreasing diameters. The first step portion is sleeved inside the shielding tube body 34, the second step portion is in contact with the above-mentioned sealing ring 5 in a direction parallel to the axial direction of the shielding tube body 34, and the third step portion is sleeved inside the sealing ring 5. Further, the assembly ring 6 is airtightly connected to the sealing ring 5 by brazing or argon arc welding to seal the vacuum area 41. The assembly ring 6 also has a hooking portion, which is used to hook the airtight window member 4 and is connected to the airtight window member 4 in a single-side constrained and airtight manner by brazing or diffusion welding.

In order to facilitate fixing the above-mentioned shielding tube 3 on the box shell 11, the above-mentioned shielding tube 3 includes a shielding tube body 34 and a pipe mouth mounting member 7. The pipe mouth mounting member 7 is liquid-tightly connected to the outer wall of the shielding tube body 34, and the pipe mouth mounting member 7 is liquid-tightly connected to the installation box 1 to prevent the insulating medium 13 from leaking out of the installation box 1. The pipe mouth mounting member 7 is detachably sealed and connected to the box shell 11 through a connecting component (such as bolts, screws) and an O-ring.

In order to ensure the attenuation effect of the above-mentioned shielding tube 3 on invalid X-rays and stray X-rays, the above-mentioned shielding tube 3 includes a shielding tube body 34, and the shielding tube body 34 is made of an X-ray shielding material with high X-ray attenuation characteristics. The X-ray shielding material is one or a combination of tungsten, lead, bismuth, lead alloy, tungsten alloy, bismuth alloy and a polymer material containing metal oxides, and the metal element of the metal oxide is one of tungsten, lead and bismuth.

In order to ensure the attenuation effect of the shielding tube 3 on invalid X-rays and stray X-rays, the equivalent lead thickness of the shielding tube body 34 is 2-10 mm. The equivalent lead thickness is related to the tube voltage value of the X-ray tube.

In order to further prevent the occurrence of high voltage sparking between the shielding tube body 34 and the anode assembly 9 and/or cathode assembly 8, the shielding tube body 34 has an anti-sparking chamfer 33 at the edge of the port close to the vacuum tube. The corner radius can be 1-6 mm, and the chamfer radius is related to the tube voltage value of the X-ray tube.

Similarly, in order to further prevent the occurrence of high-voltage sparking between the shielding tube body 34 and the anode assembly 9 and/or the cathode assembly 8, the surface roughness of the shielding tube body 34 is not greater than 0.6. Specifically, the surface of the shielding tube body 34 needs to be polished to remove the sharp burrs on the surface and prevent the occurrence of high-voltage sparking between the shielding tube body 34 and the anode assembly 9 and/or the cathode assembly 8.

When the shielding tube body 34 is made of an electrically insulating material, in order to protect the seal between the sealing ring 5 and the vacuum tube 2 and reduce the electric field strength at the seal, a metal film is plated on the surface of the shielding tube body 34. The metal film can prevent the seal between the sealing ring 5 and the vacuum tube 2 from sparking relative to the anode assembly 9 and/or the cathode assembly 8.

The present invention also provides an X-ray source, comprising:

The above-mentioned shielding window assembly between the inner and outer shells suitable for an X-ray source;

The box shielding layer 12 is arranged on the surface of the box shell 11;

An insulating medium 13, the insulating medium 13 is filled in a cavity defined by the box shell 11, the vacuum tube 2 and the shielding tube 3;

And components such as a high voltage generating circuit, an electron emitter driving circuit and a solid insulating device which are integrated inside the installation box 1 and immersed in the insulating medium 13 .

In the X-ray source of the present invention, by configuring the above-mentioned inner and outer shell shielding window assembly suitable for the X-ray source, the thickness of the box shielding layer 12 is made thinner, so that the insulating medium 13 will not be affected by the scattering and dissipation of X-rays.

In summary, the present invention can prevent the invalid X-rays and stray X-rays generated by the above-mentioned anode assembly from entering the insulating medium of the X-ray source, and also prevent the effective X-rays X3 generated by the above-mentioned anode assembly from being affected by the attenuation and scattering caused by the insulating medium of the X-ray source on the emission path, thereby reducing the generation of stray X-rays on the emission path, improving the X-ray intensity, and improving the imaging quality of the entire X-ray system. At the same time, the thickness requirement of the shielding layer of the X-ray source box is reduced, and the components such as high-voltage circuits immersed in the insulating medium 13 are prevented from being irradiated by X-rays, thereby increasing the service life of the X-ray source, and preventing the risk of high-voltage sparks between the shielding tube and the anode assembly including the anode sleeve when the X-ray tube is working, and further reducing the radiation to humans. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims (12)

A shielding window assembly between an inner and outer shell suitable for an X-ray source, characterized by comprising: An installation box (1), the installation box (1) comprising a box shell (11), the box shell (11) being provided with a box opening (111) for allowing X-rays to be emitted; A vacuum tube (2), the vacuum tube (2) being arranged in the inner cavity of the box shell (11), the vacuum tube (2) being provided with a tube opening (21) which allows X-rays to be emitted and is aligned with the box shell opening (111); a cathode assembly (8) and an anode assembly (9) spaced apart from the cathode assembly (8) are arranged in the vacuum tube (2), and the anode assembly (9) is provided with an anode sleeve (93) having an X-ray outlet; A shielding tube (3) having an X-ray shielding function, wherein the two ends of the shielding tube (3) along its own axis are an inner port (31) facing the vacuum tube (2) and an outer port (32) facing the box shell (11), respectively; the inner port (31) is airtightly connected to the tube body opening (21) to isolate the vacuum area (41) located inside the vacuum tube (2) and the insulating medium (13) located between the vacuum tube (2) and the installation box (1); the outer port (32) is liquid-tightly connected to the box body opening (111) to prevent the insulating medium (13) located between the vacuum tube (2) and the installation box (1) from leaking out of the installation box (1); an airtight window member (4) is provided inside the shielding tube (3); the airtight window member (4) is used to form the vacuum area (41) in the inner space of the airtight window member (4) and form a non-vacuum area (42) in the outer space of the airtight window member (4). According to claim 1, the inner and outer shell shielding window assembly suitable for an X-ray source is characterized in that: the shielding tube (3) includes a shielding tube body (34) and a sealing ring (5), the sealing ring (5) is sleeved inside the shielding tube body (34), and the sealing ring (5) is close to one end of the vacuum tube (2) and is airtightly connected to the tube body opening (21). The inner and outer shell shielding window assembly suitable for an X-ray source according to claim 2 is characterized in that one end of the shielding tube body (34) protrudes from the sealing ring (5) in a direction close to the vacuum tube (2) by a length of 1-3 mm. According to claim 2, the shielding window assembly between the inner and outer shells of the X-ray source is characterized in that: the shielding tube (3) also includes an assembly ring (6), the assembly ring (6) and the sealing ring (5) are air-tightly connected and matched, and the assembly ring (6) and the shielding tube body (34) are liquid-tightly connected and matched; the airtight window member (4) is air-tightly arranged in the assembly ring (6). According to claim 1, the inner and outer shell shielding window assembly suitable for an X-ray source is characterized in that: the shielding tube (3) includes a shielding tube body (34) and a pipe mouth mounting member (7), the pipe mouth mounting member (7) is liquid-tightly connected to the outer peripheral wall of the shielding tube body (34), and the pipe mouth mounting member (7) is detachably liquid-tightly connected to the box shell (11) through a connecting assembly. According to claim 1, the inner and outer shell shielding window assembly suitable for an X-ray source is characterized in that: the shielding tube (3) includes a shielding tube body (34), and the shielding tube body (34) is made of an X-ray shielding material with high X-ray attenuation characteristics, and the X-ray shielding material is one or a combination of tungsten, lead, bismuth, lead alloy, tungsten alloy, bismuth alloy and a polymer material containing metal oxides, and the metal element of the metal oxide is one of tungsten, lead and bismuth. The inner and outer shell shielding window assembly suitable for an X-ray source according to claim 1 is characterized in that the shielding tube (3) comprises a shielding tube body (34), and the equivalent lead thickness of the shielding tube body (34) is 2-10 mm. According to claim 1, the inner and outer shell shielding window assembly suitable for an X-ray source is characterized in that: the shielding tube (3) includes a shielding tube body (34), and the shielding tube body (34) has an anti-spark chamfer (33) near the edge of the port of the vacuum tube (2). The inner and outer shell shielding window assembly suitable for an X-ray source according to claim 1 is characterized in that: the shielding tube (3) comprises a shielding tube body (34), and the surface roughness of the shielding tube body (34) is not greater than 0.6. The inner and outer shell shielding window assembly suitable for an X-ray source according to claim 1 is characterized in that: the shielding tube (3) comprises a shielding tube body (34), and the shielding tube body (34) is plated with a metal film on its surface when the shielding tube body (34) is made of an electrical insulating material. According to the inner and outer shell shielding window assembly for an X-ray source as shown in claim 1, it is characterized in that the X-ray outlet aperture of the shielding tube (3) is larger than the X-ray outlet aperture of the anode sleeve (93). An X-ray source, characterized in that it comprises: The inner and outer shell shielding window assembly suitable for an X-ray source as claimed in any one of claims 1 to 11; A box shielding layer (12), the box shielding layer (12) is arranged on the surface of the box shell (11); An insulating medium (13), the insulating medium (13) is filled in a cavity defined by the box shell (11), the vacuum tube (2) and the shielding tube (3); And a circuit component and a solid insulating component which are integrated inside the installation box (1) and immersed in an insulating medium (13).