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

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

[0001] The present 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 the X-ray source. Background Art

[0002] An X-ray tube is a high-voltage, high-vacuum electronic device with an electron emitter. Electrons are emitted from the emitter and then accelerated by a high-voltage electric field of tens or hundreds of kilovolts between the cathode and anode, forming an electron beam. These electrons then strike an anode target, producing X-rays. An X-ray tube typically consists of a cathode with an electron emitter, an anode for generating X-rays and dissipating heat, and a tube shell for insulation and vacuum packaging.

[0003] In a typical integrated X-ray source, or so-called monoblock X-ray source, the X-rays generated by the anode target exit the X-ray tube through the anode housing window and the housing. After leaving the X-ray tube, the X-rays encounter insulating materials such as insulating oil and the X-ray source window, causing photoelectric, Compton, or electron-pair effects with their atoms, generating a large number of stray X-rays in various directions. These stray X-rays can cause attenuation and damage to high-voltage circuit components and insulation in the X-ray source, increase the thickness of the shielding structure, and thus shorten the lifespan and weight of the X-ray source, leading to a decrease in imaging quality of the entire X-ray system. Furthermore, ineffective X-rays generated by the anode target and stray X-rays generated by electrons escaping from the target surface can enter the X-ray source's insulating liquid, causing scattering in various directions. This can also cause attenuation and damage to high-voltage circuit components and insulation in the X-ray source, increase the thickness of the shielding structure, and shorten the lifespan and increase the weight of the X-ray source.

[0004] Existing patents (JP2020087727A, JP202091970A, and JP2019133872A) each disclose an X-ray tube with a lateral X-ray transmission assembly. These X-ray tubes with lateral transmission windows employ either a flexible structure for adjusting the position of the window and focal point, a special arrangement in the cathode assembly to produce a deflected focal point to expand the beam angle, or protective material in the beryllium weld area of ​​the lateral window to improve corrosion resistance. While these X-ray transmission assemblies can prevent effective X-rays generated by the anode target from entering the X-ray imaging system directly through the lateral window without passing through insulating media such as insulating oil, the components and structural configuration of these X-ray transmission assemblies function solely to create a vacuum-tight space and lack X-ray shielding. Consequently, they cannot prevent ineffective X-rays generated by the anode target and stray X-rays generated by electrons escaping from the target surface from entering the X-ray source's insulating liquid, causing scattering in various directions. This can lead to attenuation and damage to high-voltage circuit components and insulation components in the X-ray source, as well as increased shielding thickness.

[0005] Summary of the Invention

[0006] In view of the shortcomings of the prior art described above, the technical problem to be solved by the present invention is to provide a shielding window assembly between an inner and outer shell of an X-ray source and an X-ray source, which 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, the thickness requirement of the shielding layer of the X-ray source box is reduced, and 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 can be prevented. In addition, the radiation to humans can be reduced.

[0007] 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:

[0008] An installation box, the installation box includes a box shell, and the box shell is provided with a box opening allowing X-rays to be emitted;

[0009] A vacuum tube is provided in the inner cavity of the box shell. The vacuum tube is provided with a tube opening that 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 provided in the vacuum tube. The anode assembly is covered with an anode sleeve with an X-ray outlet.

[0010] A shielding tube with X-ray shielding function, with two ends of the shielding tube along its own axis respectively being an inner port facing the vacuum tube and an outer pipe opening facing the box shell, the inner port being airtightly 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 being 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, an airtight window piece is provided in the shielding tube, the airtight window piece is used to form the vacuum area in the inner space of the airtight window piece and to form a non-vacuum area in the outer space of the airtight window piece.

[0011] Preferably, the shielding tube comprises a shielding tube body and a sealing ring, the sealing ring is sleeved inside the shielding tube body, and the sealing ring is close to one end of the vacuum tube and is airtightly connected to the tube body opening.

[0012] Preferably, the length of one end of the shielding tube body protruding from the sealing ring in the direction close to the vacuum tube is 1-3 mm.

[0013] 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.

[0014] Preferably, the shielding tube comprises a shielding tube body and a tube nozzle mounting piece, the tube nozzle mounting piece is liquid-tightly connected to the outer peripheral wall of the shielding tube body, and the tube nozzle mounting piece is detachably liquid-tightly connected to the box shell through a connecting assembly.

[0015] 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.

[0016] Preferably, the shielding tube comprises a shielding tube body, and the equivalent lead thickness of the shielding tube body is 2-10 mm.

[0017] Preferably, the shielding tube comprises a shielding tube body, and the shielding tube body has an anti-spark chamfer at an edge close to the port of the vacuum tube.

[0018] Preferably, the shielding tube includes a shielding tube body, and the surface roughness of the shielding tube body is not greater than 0.6.

[0019] Preferably, the shielding tube comprises a shielding tube body, and when the shielding tube body is made of an electrically insulating material, a metal film is plated on its surface.

[0020] 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.

[0021] Preferably, the X-ray outlet aperture of the shielding tube is larger than the X-ray outlet aperture of the anode sleeve. Through such an arrangement, the invalid X-rays and stray X-rays generated by the anode assembly that pass through the sleeve window are blocked and attenuated by the shielding tube of the shielding tube, and thus do not enter the insulating medium inside the X-ray source box shell.

[0022] The present invention also provides an X-ray source, comprising:

[0023] The shielding window assembly between the inner and outer shells suitable for an X-ray source;

[0024] The box shielding layer is arranged on the surface of the box shell;

[0025] Insulating medium, the insulating medium is filled in the cavity defined by the box shell, the vacuum tube and the shielding tube;

[0026] As well as circuit components and solid insulation components integrated inside the installation box and immersed in the insulating medium.

[0027] As described above, the present invention provides a shielding window assembly for an inner and outer shell of an X-ray source and an X-ray source, each having the following advantageous effects: the housing is provided with a housing opening allowing X-rays to escape, and the vacuum tube is provided with a tube opening aligned with the housing opening, allowing X-rays to escape. This facilitates the direct escape of X-rays generated by the anode assembly. The key innovation of the present invention lies in a shielding tube that provides X-ray shielding, with its axial ends defining an inner port facing the vacuum tube and an outer port facing the housing. The inner port is in airtight communication with the tube opening, while the outer port is in fluid-tight communication with the housing opening to enclose an insulating medium. An airtight window is provided within the shielding tube, which creates a vacuum zone within the airtight window and a non-vacuum zone outside the airtight window. This arrangement allows effective X-rays generated by the anode assembly to pass from the vacuum zone to the non-vacuum zone solely through the airtight window, without having to pass through the insulating medium of the X-ray source. Furthermore, and more importantly, because the shielding tube is made of X-ray shielding material, it can attenuate ineffective X-rays generated by the anode assembly and stray X-rays generated by electrons spilling out of the target surface. These electrons spilling out of the target surface 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 present invention, suitable for use with an X-ray source, can prevent ineffective and stray X-rays generated by the anode assembly from entering the insulating medium of the X-ray source. It also protects the generated effective X-rays from being attenuated and scattered by the insulating medium of the X-ray source during their emission path, thereby reducing the generation of stray X-rays along the emission path, increasing X-ray intensity, and improving the imaging quality of the entire X-ray system. This also reduces the thickness requirement for the shielding layer of the X-ray source housing, prevents components such as high-voltage circuits immersed in the insulating medium from being irradiated by X-rays, and extends the service life of the X-ray source. It can also prevent the risk of high-voltage sparks between the shielding tube and the anode assembly, including the anode sleeve, during operation of the X-ray tube, and further reduces radiation exposure to humans. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG1 is a cross-sectional view showing an assembly of a shielding window assembly between an inner and outer shell for an X-ray source.

[0029] FIG2 is an assembly cross-sectional view of the shielding tube body, the sealing ring, the assembly ring and the pipe mouth mounting member.

[0030] FIG3 is an enlarged view of portion A in FIG2 .

[0031] Explanation of component numbers: 1 is the installation box; 11 is the box shell; 111 is the box body opening; 12 is the box body shielding layer; 13 is the insulating medium; 2 is the vacuum tube; 21 is the tube body opening; 3 is the shielding tube; 31 is the inner port; 32 is the outer tube mouth; 33 is the anti-spark chamfer; 34 is the shielding tube body; 4 is the airtight window part; 41 is the vacuum area; 42 is the non-vacuum area; 5 is the sealing ring; 6 is the assembly ring; 7 is the tube mouth mounting part; 8 is the cathode assembly; 9 is the anode assembly; 91 is the anode handle; 92 is the anode target; 93 is the anode sleeve; 94 is the sleeve window part. DETAILED DESCRIPTION

[0032] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0033] 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 conditions for implementation of the present invention. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose of 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 implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0034] 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.

[0035] Referring to FIG1 , the present invention provides an X-ray source comprising an installation box 1 and an X-ray tube disposed within the installation box 1. The installation box 1 also integrates components such as a high-voltage generating circuit, an electron emitter driving circuit, and a solid-state insulator (the high-voltage generating circuit, the electron emitter driving circuit, and the solid-state insulator are not shown). The X-ray tube comprises a vacuum tube 2, within which is disposed a cathode assembly 8 capable of emitting an electron beam e and an anode assembly 9 bombarded by the electron beam e. The anode assembly 9 comprises an anode handle 91, an anode target 92 disposed at the end of the anode handle 91, and an anode housing 93 covering the anode target 92. The anode housing 93 is provided with a housing window 94 that allows X-rays to escape.

[0036] As shown in FIG1 , FIG2 and FIG3 , in order to prevent the effective X-rays 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 during the emission path, and to prevent the ineffective X-rays and stray X-rays generated by the anode assembly 9 from entering the insulating medium 13 of the X-ray source, the present invention provides a shielding window assembly between an inner and outer shell of an X-ray source, comprising:

[0037] The installation box 1 includes a box shell 11, and the box shell 11 is provided with a box opening 111 that allows X-rays to be emitted;

[0038] The vacuum tube 2 is disposed in the inner cavity of the box shell 11 and is provided with a tube opening 21 that allows X-rays to be emitted and is aligned with the box opening 111;

[0039] A shielding tube 3 with an X-ray shielding function has two ends along its own axial direction, 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 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 opening 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 outside the installation box 1. An airtight window piece 4 is provided in the shielding tube 3. The airtight window piece 4 is used to form a vacuum area 41 in the inner space of the airtight window piece 4 and to form a non-vacuum area 42 in the outer space of the airtight window piece 4.

[0040] 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, thereby creating conditions for the direct emission of X-rays generated by the anode assembly 9. Compared with the X-ray tubes 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 X-ray sources 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 shielding tube 3 has two axial ends, one inside the tube 2 and the other outside the housing 11. The inside port 31 is in airtight communication with the tube opening 21, thereby isolating the vacuum region inside the tube 2 from the insulating medium 13 between the tube 2 and the mounting box 1. The outside port 32 is in liquid-tight communication with the housing opening 111, thereby preventing the insulating medium 13 between the vacuum tube 2 and the mounting box 1 from leaking out of the mounting box 1. An airtight window 4 is provided within the shielding tube 3. The airtight window 4 is configured to form a vacuum region 41 within the space inside the airtight window 4 and a non-vacuum region 42 outside the space outside the airtight window 4. With this arrangement, effective X-rays generated by the anode assembly 9 (see the dashed line indicated by X3 in FIG. 1 ) can be transmitted from the vacuum region 41 to the non-vacuum region 42 solely through the airtight window 4, without having to pass through the insulating medium 13 of the X-ray source. More importantly, because the shielding tube 3 has an X-ray shielding function, it can completely shield the invalid X-rays generated by the anode assembly 9 (see the dotted line indicated by X1 in Figure 1) and the stray X-rays generated by the target surface overflow electrons (see the dotted line indicated by X2 in Figure 1) inside the shielding tube 3, completely preventing the invalid X-rays and stray X-rays from transmitting through the insulating medium 13 located between the vacuum tube 2 and the installation box 1, thereby effectively protecting the high-voltage generating circuit, electron emitter drive circuit, and solid insulation device integrated in the installation box 1, thereby improving 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.

[0041] 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 effective X-rays X3 generated by the above-mentioned anode assembly 9 can be emitted from the vacuum area 41 to the non-vacuum area 42 by passing through only the airtight window component 4, and no longer pass 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.

[0042] 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. The anode assembly 9 is provided with an anode sleeve 93 with an X-ray outlet. This can 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.

[0043] 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 sparks 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.

[0044] 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.

[0045] The X-ray outlet aperture of the above-mentioned shielding tube 3 is larger than the X-ray outlet aperture of the anode sleeve 93. Through 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.

[0046] The shielding tube 3 includes a shielding tube body 34, which can be made of a non-electrically insulating material, such as one or more of tungsten, lead, bismuth, a lead alloy, a tungsten alloy, and a bismuth alloy. The shielding tube body 34 can also be made of an electrically insulating material, such as a polymer containing a highly attenuating oxide, such as an epoxy containing lead oxide or bismuth oxide. This arrangement attenuates ineffective and stray X-rays generated by the anode assembly 9, effectively shielding them within the lumen of the shielding tube body 34 and preventing them from entering the insulating medium 13.

[0047] 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, which 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.

[0048] As shown in FIG2 , in order to prevent sparking between the sealing portion of the sealing ring 5 and the vacuum tube 2 relative to the anode assembly 9 and / or cathode assembly 8, one end of the shielding tube body 34 protrudes from the sealing ring 5 in a direction close to the vacuum tube 2, for example, the protruding length L is 1-3 mm.

[0049] As shown in Figures 2 and 3, to facilitate installation of the airtight window member 4 within the shielding tube 3, the shielding tube 3 further includes an assembly ring 6, the outer circumferential wall of which is fluid-tightly connected to the inner circumferential wall of the shielding tube body 34. This prevents 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 airtight window member 4 is sealed within the assembly ring 6. The outer circumferential wall of the assembly ring 6 is stepped, and the assembly ring 6 comprises a first step portion, a second step portion, and a third step portion, each of which has a decreasing diameter. The first step portion is internally sleeved within the shielding tube body 34, the second step portion abuts against the sealing ring 5 in a direction parallel to the axial direction of the shielding tube body 34, and the third step portion is internally sleeved within the sealing ring 5. Furthermore, the assembly ring 6 is airtightly connected to the sealing ring 5 by brazing or argon arc welding to seal the vacuum region 41. The assembly ring 6 further has a hook portion, which is used to hook the airtight window member 4 and is airtightly connected to the airtight window member 4 by means of brazing or diffusion welding.

[0050] In order to facilitate the fixing of 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 peripheral 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.

[0051] 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, 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.

[0052] To ensure the shielding tube 3's attenuation effect on invalid and stray X-rays, the shielding tube body 34 has an equivalent lead thickness of 2-10 mm. The equivalent lead thickness is related to the tube voltage of the X-ray tube.

[0053] To further prevent high-voltage sparks from occurring between the shielding tube body 34 and the anode assembly 9 and / or cathode assembly 8, the shielding tube body 34 has an anti-spark chamfer 33 near the edge of the vacuum tube port. The chamfer radius of the anti-spark chamfer 33 can be 1-6 mm, and the chamfer radius is related to the tube voltage of the X-ray tube.

[0054] Similarly, to further prevent high-voltage sparking between the shielding tube body 34 and the anode assembly 9 and / or 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 is polished to remove sharp burrs and prevent high-voltage sparking between the shielding tube body 34 and the anode assembly 9 and / or cathode assembly 8.

[0055] When the shielding tube body 34 is made of an electrically insulating material, a metal film is coated on its surface to protect the seal between the sealing ring 5 and the vacuum tube 2 and reduce the electric field strength at the seal. The metal film prevents sparks from the seal between the sealing ring 5 and the vacuum tube 2 relative to the anode assembly 9 and / or cathode assembly 8.

[0056] The present invention also provides an X-ray source, comprising:

[0057] The above-mentioned shielding window assembly between the inner and outer shells suitable for X-ray sources;

[0058] The box shielding layer 12 is provided on the surface of the box shell 11;

[0059] An insulating medium 13 is filled in the cavity defined by the housing 11, the vacuum tube 2 and the shielding tube 3;

[0060] And components such as a high-voltage generating circuit, an electron emitter driving circuit, and a solid insulating device are integrated inside the installation box 1 and immersed in the insulating medium 13.

[0061] In the X-ray source of the present invention, by configuring the above-mentioned shielding window assembly between the inner and outer shells 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.

[0062] In summary, the present invention can prevent the invalid X-rays and stray X-rays generated by the anode assembly from entering the insulating medium of the X-ray source, and also prevent the effective X-rays X3 generated by the 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, increasing 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 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. It can also prevent the risk of high-voltage sparks between the shielding tube and the anode assembly including the anode sleeve when the X-ray tube is operating, and further reduce radiation to humans. Therefore, the present invention effectively overcomes various shortcomings of the prior art and has high industrial application value.

[0063] 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 skilled in 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 one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A shielding window assembly between an inner and outer shell suitable for an X-ray source, characterized in that: include: 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).

2. The inner and outer shell shielding window assembly suitable for an X-ray source according to claim 1, characterized in that: The shielding tube (3) comprises a shielding tube body (34) and a sealing ring (5), wherein the sealing ring (5) is sleeved inside the shielding tube body (34), and one end of the sealing ring (5) close to the vacuum tube (2) is airtightly connected to the tube body opening (21).

3. The inner and outer shell shielding window assembly suitable for an X-ray source according to claim 2, characterized in that: One end of the shielding tube body (34) protrudes from the sealing ring (5) by a length of 1-3 mm in a direction close to the vacuum tube (2).

4. The inner and outer shell shielding window assembly suitable for an X-ray source according to claim 2, characterized in that: The shielding tube (3) further comprises 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 air-tight window member (4) is air-tightly arranged in the assembly ring (6).

5. The inner and outer shell shielding window assembly suitable for an X-ray source according to claim 1, characterized in that: The shielding pipe (3) comprises a shielding pipe body (34) and a pipe mouth mounting member (7), wherein the pipe mouth mounting member (7) is liquid-tightly connected to the outer peripheral wall of the shielding pipe body (34), and the pipe mouth mounting member (7) is detachably liquid-tightly connected to the box shell (11) via a connecting assembly.

6. The inner and outer shell shielding window assembly suitable for an X-ray source according to claim 1, characterized in that: The shielding tube (3) comprises a shielding tube body (34), which is made of an X-ray shielding material having high X-ray attenuation characteristics, wherein 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 a metal oxide, wherein the metal element of the metal oxide is one of tungsten, lead and bismuth.

7. The inner and outer shell shielding window assembly suitable for an X-ray source according to claim 1, 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.

8. The inner and outer shell shielding window assembly suitable for an X-ray source according to claim 1, characterized in that: The shielding tube (3) comprises a shielding tube body (34), and the shielding tube body (34) has an anti-spark chamfer (33) at the edge of the port close to the vacuum tube (2).

9. The inner and outer shell shielding window assembly suitable for an X-ray source according to claim 1, 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.

10. The inner and outer shell shielding window assembly suitable for an X-ray source according to claim 1, characterized in that: The shielding tube (3) comprises a shielding tube body (34); when the shielding tube body (34) is made of an electrical insulating material, a metal film is plated on its surface.

11. The inner and outer shell shielding window assembly for an X-ray source according to claim 1, 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).

12. An X-ray source, characterized in that: include: 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).

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