CN116705579B - Internally and externally shielded window assembly suitable for X-ray source and X-ray source - Google Patents
Internally and externally shielded window assembly suitable for X-ray source and X-ray source Download PDFInfo
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- CN116705579B CN116705579B CN202310982292.2A CN202310982292A CN116705579B CN 116705579 B CN116705579 B CN 116705579B CN 202310982292 A CN202310982292 A CN 202310982292A CN 116705579 B CN116705579 B CN 116705579B
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- 238000007789 sealing Methods 0.000 claims description 34
- 238000009434 installation Methods 0.000 claims description 14
- 238000009413 insulation Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 8
- 229910052797 bismuth Inorganic materials 0.000 claims description 7
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 229910052721 tungsten Inorganic materials 0.000 claims description 7
- 239000010937 tungsten Substances 0.000 claims description 7
- 229910044991 metal oxide Inorganic materials 0.000 claims description 6
- 150000004706 metal oxides Chemical class 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 5
- 229910001152 Bi alloy Inorganic materials 0.000 claims description 4
- 229910000978 Pb alloy Inorganic materials 0.000 claims description 4
- 229910001080 W alloy Inorganic materials 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 239000002861 polymer material Substances 0.000 claims description 4
- 230000003746 surface roughness Effects 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 abstract description 8
- 238000003466 welding Methods 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000002238 attenuated effect Effects 0.000 description 3
- 238000005219 brazing Methods 0.000 description 3
- 230000005574 cross-species transmission Effects 0.000 description 3
- 239000012777 electrically insulating material Substances 0.000 description 3
- 238000010894 electron beam technology Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
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- 230000005684 electric field Effects 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000416 bismuth oxide Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
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- 238000010168 coupling process Methods 0.000 description 1
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- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
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- 229910000464 lead oxide Inorganic materials 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/16—Vessels; Containers; Shields associated therewith
- H01J35/18—Windows
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/16—Vessels; Containers; Shields associated therewith
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/10—Nuclear fusion reactors
Landscapes
- X-Ray Techniques (AREA)
Abstract
The invention provides an inner and outer shell shielding window assembly suitable for an X-ray source and the X-ray source, comprising: the mounting box comprises a box shell; a vacuum tube provided with a tube opening allowing X-rays to be emitted and aligned with the opening of the box body; the inner side port of the shielding pipe is closely communicated with the opening of the pipe body, the outer side pipe orifice is closely communicated with the opening of the box body, and an airtight window piece is arranged in the shielding pipe and used for enabling the inner side space of the airtight window piece to form a vacuum area and enabling the outer side space of the airtight window piece to form a non-vacuum area. The invention can prevent X-rays generated by the anode component from being scattered by the X-ray source insulating medium on the emitting path, prevent ineffective X-rays and stray X-rays generated by the anode component from entering the X-ray source insulating medium, improve the X-ray intensity, improve the imaging quality of the whole X-ray system, reduce the thickness requirement of a shielding layer of a box body of the X-ray source, and reduce the radiation to people.
Description
Technical Field
The invention relates to the technical field of X-ray equipment, in particular to an inner and outer shell shielding window assembly suitable for an X-ray source and the X-ray source.
Background
An X-ray tube is a high-voltage, high-vacuum electronic device with an electron emitter from which electrons are emitted, which are then accelerated by a high-voltage electric field of several tens or hundreds of kilovolts between a cathode and an anode to form an electron beam, which is finally bombarded on an anode target to generate X-rays. An X-ray tube generally comprises a cathode with an electron emitter, an anode for generating X-rays and for dissipating heat, and a tube envelope for insulation and vacuum packaging.
In a typical integrated X-ray source, or so-called Monoblock X-ray source, the X-rays generated from the anode target leave the X-ray tube through the window and tube sleeve of the anode sleeve. On the way after leaving the X-ray tube, X-rays, when encountering materials like insulating media like insulating oil, X-ray source windows, etc., experience photoelectric, compton or electron pair effects with their atoms, producing a large number of stray X-rays in various directions. These stray X-rays can lead to attenuation and damage of high voltage circuit components and insulation devices in the X-ray source, as well as an increase in the thickness of the shielding layer structure, which can lead to a reduction in the life of the X-ray source and an increase in weight, as well as a reduction in the imaging quality of the X-ray complete system. In addition, ineffective X-rays generated by the anode target and stray X-rays generated by electrons overflowing from the target surface also enter the insulating liquid of the X-ray source to cause scattering in various directions, and also cause attenuation and damage of high-voltage circuit components and insulating components in the X-ray source and increase of the thickness of the shielding layer structure, thereby causing reduction of the service life of the X-ray source and increase of the weight.
The prior patents (JP 2020087727A, JP202091970a and JP2019133872 a) disclose X-ray tubes with lateral X-ray transmission assemblies, respectively, which use a flexible structure for adjusting the position of the window and the focus, or a special arrangement for generating a biased focus at the cathode assembly site to enlarge the beam angle, or a protective material for improving corrosion resistance at the welding area of the beryllium sheet of the lateral window. Although the X-ray transmission assembly can prevent effective X-rays generated by the anode target from directly entering an imaging system of the X-ray complete machine from a lateral window through insulating media such as insulating oil, the functions of each component and the structure of the X-ray transmission assembly are only to form a vacuum airtight space without an X-ray shielding function, so that ineffective X-rays generated by the anode target and stray X-rays generated by overflowed electrons on the target surface cannot be prevented from entering an X-ray source insulating liquid, and scattering in various directions is caused, thereby leading to attenuation and damage of high-voltage circuit components and insulating components in the X-ray source and increase of the thickness of a shielding layer structure.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide an inter-housing shielding window assembly and an X-ray source suitable for an X-ray source, which are capable of preventing ineffective X-rays and stray X-rays generated by the above-mentioned anode assembly from entering an insulating medium of the X-ray source, preventing the generated effective X-rays from being affected by attenuation and scattering caused by the insulating medium of the X-ray source on an emission path, reducing the generation of stray X-rays on the emission path, improving the X-ray intensity, improving the imaging quality of the whole system of X-rays, reducing the thickness requirement of a shielding layer of a case of the X-ray source, and preventing a risk of high-voltage ignition between a shielding tube and the anode assembly including an anode sleeve when the X-ray tube is in operation, and reducing radiation to a person.
In order to solve the above technical problem, the present invention provides an inter-housing shielding window assembly for an X-ray source, comprising:
the mounting box comprises a box shell, and a box body opening allowing X-rays to be emitted is formed in the box shell;
the vacuum tube is arranged in the inner cavity of the box shell, and a tube opening which allows X-rays to be emitted and is aligned with the opening of the box body is arranged on the vacuum tube; the vacuum tube is internally provided with a cathode component and an anode component which is arranged at intervals with the cathode component, and the anode component is sleeved with an anode sleeve with an X-ray outlet;
the shielding tube with the X-ray shielding function, the shielding tube is respectively towards the inner side port of the vacuum tube and towards the outer side tube orifice of the case along the axial both ends of the shielding tube, the inner side port is hermetically communicated with the tube body opening to isolate a vacuum area positioned on the inner side of the vacuum tube and an insulating medium positioned between the vacuum tube and the installation case, the outer side tube orifice is in liquid-tight communication with the case opening to prevent the insulating medium positioned between the vacuum tube and the installation case from leaking out of the installation case, an airtight window piece is arranged in the shielding tube and used for enabling the inner side space positioned in the airtight window piece to form the vacuum area and enabling the outer side space positioned in the airtight window piece to form a non-vacuum area.
Preferably, the shielding pipe comprises a shielding pipe body and a sealing ring, the sealing ring is sleeved in the shielding pipe body, and one end of the sealing ring, which is close to the vacuum pipe, is in airtight connection and fit with the opening of the pipe body.
Preferably, one end of the shielding pipe body protrudes from the sealing ring towards the direction close to the vacuum pipe, and the length of the shielding pipe body is 1-3mm.
Preferably, the shielding pipe further comprises a fitting ring, the fitting ring and the sealing ring are in airtight connection fit, and the fitting ring and the shielding pipe body are in liquid-tight connection fit; the airtight window piece is airtight arranged in the assembly ring.
Preferably, the shielding pipe comprises a shielding pipe body and a pipe orifice mounting piece, wherein the pipe orifice mounting piece is connected to the outer peripheral wall of the shielding pipe body in a liquid-tight manner, and the pipe orifice mounting piece is detachably connected with the box shell in a liquid-tight manner through a connecting assembly.
Preferably, the shielding tube comprises a shielding tube body made of an X-ray shielding material with high X-ray attenuation characteristic, wherein the X-ray shielding material is one or a combination of tungsten, lead, bismuth, lead alloy, tungsten alloy, bismuth alloy and a high polymer material containing metal oxide, and the metal element of the metal oxide is one of tungsten, lead and bismuth.
Preferably, the shielding pipe comprises a shielding pipe body, and the equivalent lead thickness of the shielding pipe body is 2-10mm.
Preferably, the shielding tube comprises a shielding tube body, and a port edge of the shielding tube body, which is close to the vacuum tube, is provided with an anti-ignition chamfer.
Preferably, the shielding pipe includes a shielding pipe body having a surface roughness of not more than 0.6.
Preferably, the shielding pipe comprises a shielding pipe body, and the surface of the shielding pipe body is plated with a metal film when the shielding pipe body is made of an electric insulating material.
Preferably, the shielding tube and the anode sleeve form a preset gap in the axial direction of the shielding tube, namely, a preset vacuum insulation distance is formed between the shielding tube and the anode sleeve through the tube wall of the vacuum tube and a partial vacuum region in the vacuum tube, so that the high-voltage sparking risk is prevented from being generated between the shielding tube and an anode assembly comprising the anode sleeve when the X-ray tube works.
Preferably, the X-ray exit aperture of the shielding tube is larger than the X-ray exit aperture of the anode casing, and by so doing, the ineffective X-rays and stray X-rays generated by the anode assembly that pass through the casing window are shielded and attenuated by the shielding tube of the shielding tube so as not to enter the insulating medium within the X-ray source housing.
The present invention also provides an X-ray source comprising:
the shielding window assembly between inner and outer shells suitable for the X-ray source;
the box body shielding layer is arranged on the surface of the box shell;
the insulating medium is filled in a cavity defined by the case shell, the vacuum tube and the shielding tube;
and a circuit device and a solid insulation device integrated inside the installation box and immersed by the insulation medium.
As described above, the inter-inner-outer-shell shielding window assembly suitable for an X-ray source and the X-ray source of the present invention have the following beneficial effects: the case is provided with a case opening for allowing X-rays to be emitted, and the vacuum tube is provided with a tube opening for allowing X-rays to be emitted and aligned with the case opening, thus providing for direct emission of X-rays generated by the anode assembly. The main creation point of the shielding window assembly between inner and outer shells, which is applicable to the X-ray source, is as follows: the shielding tube with the X-ray shielding function is characterized in that two ends of the shielding tube in the axial direction of the shielding tube are respectively an inner side port facing the vacuum tube and an outer side tube opening facing the case, the inner side port is hermetically communicated with the tube body opening, the outer side tube opening is in liquid-tight communication with the case opening and used for sealing an insulating medium, an airtight window piece is arranged in the shielding tube and used for enabling an inner side space of the airtight window piece to form a vacuum area and enabling an outer side space of the airtight window piece to form a non-vacuum area. So configured, the effective X-rays generated by the anode assembly described above can be transmitted from the vacuum region to the non-vacuum region through only the airtight window, without passing through the insulating medium of the X-ray source. Furthermore, it is important that the shielding tube is made of an X-ray shielding material, which is capable of attenuating both the ineffective X-rays generated by the anode assembly and the stray X-rays generated by the target surface spill-over electrons. The target surface spill-over electrons may be one or a combination of backscattered electrons, secondary electrons, and auger electrons. Therefore, the shielding window assembly between the inner shell and the outer shell, which is suitable for the X-ray source, can prevent ineffective X-rays and stray X-rays generated by the anode assembly from entering an insulating medium of the X-ray source, prevent the generated effective X-rays from being influenced by attenuation and scattering caused by the insulating medium of the X-ray source on an emitting path, reduce the generation of the stray X-rays on the emitting path, improve the X-ray intensity, improve the imaging quality of a whole system of the X-rays, simultaneously reduce the thickness requirement of a shielding layer of a box body of the X-ray source, prevent components such as a high-voltage circuit and the like immersed in the insulating medium from being irradiated by the X-rays, prolong the service life of the X-ray source, prevent the risk of high-voltage ignition from being generated between the shielding tube and the anode assembly comprising the anode sleeve when the X-ray tube works, and reduce the radiation to people.
Drawings
Fig. 1 shows an assembled cross-sectional view of an inter-enclosure shield window assembly for an X-ray source.
Fig. 2 shows an assembled cross-sectional view of the shield tube body, seal ring, mounting ring and orifice mount.
Fig. 3 shows an enlarged view of the portion a in fig. 2.
Description of element numbers: 1 is a mounting box; 11 is a case 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 pipe; 31 is an inboard port; 32 is the outside orifice; 33 is an anti-sparking chamfer; 34 is a shielding tube body; 4 is an airtight window; 41 is the vacuum area; 42 is the non-vacuum region; 5 is a close-coupled ring; 6 is an assembly ring; 7 is a pipe orifice mounting piece; 8 is a cathode assembly; 9 is an anode assembly; 91 is an anode stem; 92 is an anode target; 93 is the anode sleeve; 94 are sleeve widgets.
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for the purpose of understanding and reading the disclosure, and are not intended to limit the scope of the invention, which is defined by the appended claims, but rather by the claims, unless otherwise indicated, and unless otherwise indicated, all changes in structure, proportions, or otherwise, used by those skilled in the art, are included in the spirit and scope of the invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
In fig. 1, a broken line indicated by X1 is an ineffective X-ray, a broken line indicated by X2 is a stray X-ray generated by the target surface overflowing electrons, and a broken line indicated by X3 is an effective X-ray.
Referring to fig. 1, the present invention provides an X-ray source including a mounting case 1 and an X-ray tube provided inside the mounting case 1, wherein a high voltage generating circuit, an electron emitter driving circuit, a solid insulation device, and the like (none of the high voltage generating circuit, the electron emitter driving circuit, and the solid insulation device is shown) are integrated inside the mounting case 1. The X-ray tube comprises a vacuum tube 2, a cathode assembly 8 for emitting an electron beam e and an anode assembly 9 for being bombarded by the electron beam e being arranged in the vacuum tube 2. The anode assembly 9 includes an anode stem 91, an anode target 92 disposed at an end of the anode stem 91, and an anode sleeve 93 covering the anode target 92, the anode sleeve 93 being provided with a sleeve window 94 for allowing X-rays to be emitted.
As shown in fig. 1, 2 and 3, in order to prevent the effective X-rays X3 generated by the anode assembly 9 from being affected by attenuation and scattering caused by the insulating medium 13 (e.g., insulating oil) of the X-ray source on 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 an inter-housing shield window assembly suitable for the X-ray source, comprising:
the mounting box 1, the mounting box 1 comprises a box shell 11, and a box body opening 111 allowing X-rays to be emitted is arranged on the box shell 11;
a vacuum tube 2, wherein the vacuum tube 2 is arranged in the inner cavity of the case 11, and a tube body opening 21 which allows X-rays to be emitted and is aligned with the case body opening 111 is arranged on the vacuum tube 2;
the shielding tube 3 with X-ray shielding function, the shielding tube 3 is towards the inside port 31 of the vacuum tube 2 and towards the outside mouth piece 32 of the case 11 respectively along both ends of its own axial, the inside port 31 communicates with the tube body opening 21 in a airtight manner to isolate the vacuum area located inside the vacuum tube 2 and the insulating medium 13 located between the vacuum tube 2 and the installation box 1, the outside mouth piece 32 communicates with the box opening 111 in a liquid-tight manner to prevent the insulating medium 13 located between the vacuum tube 2 and the installation box 1 from leaking outside the installation box 1, the airtight window 4 is provided in the shielding tube 3, the airtight window 4 is used for making the inside space located in the airtight window 4 form the vacuum area 41 and making the outside space located in the airtight window 4 form the non-vacuum area 42.
In the present invention, the case 11 (i.e., the outer case structure) is provided with a case opening 111 allowing the X-rays to be emitted, and the vacuum tube 2 (i.e., the inner case structure) is provided with a tube opening 21 allowing the X-rays to be emitted in alignment with the case opening 111, thus providing for the direct emission of the X-rays generated by the anode assembly 9. Compared to the X-ray tube with X-ray transmission assembly disclosed in the more recent prior patents (JP 2020087727A, JP202091970a and JP2019133872 a), the main creation point of the shielding window assembly between the inner and outer shells of the X-ray source according to the present invention is the "X-ray shielding function" of the "shielding tube 3", i.e. the shielding tube 3 completely prevents the X-rays from entering the insulating medium 13 (the insulating medium 13 is typically an insulating liquid like an insulating oil) 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 the axial direction of the shielding tube are respectively an inner side port 31 facing the vacuum tube 2 and an outer side tube orifice 32 facing the case 11, the inner side port 31 is hermetically communicated with the tube body opening 21, so that a vacuum area located inside the vacuum tube 2 and an insulating medium 13 located between the vacuum tube 2 and the installation case 1 can be isolated, the outer side tube orifice 32 is in liquid-tight communication with the case opening 111, so that the insulating medium 13 located between the vacuum tube 2 and the installation case 1 can be prevented from leaking outside the installation case 1, an airtight window 4 is arranged in the shielding tube 3, and the airtight window 4 is used for enabling an inner space located in the airtight window 4 to form a vacuum area 41 and enabling an outer space located in the airtight window 4 to form a non-vacuum area 42. So configured, the effective X-rays (see the dashed line indicated by X3 in fig. 1) generated by the anode assembly 9 described above can be transmitted from the vacuum region 41 to the non-vacuum region 42 only through the airtight window 4, without also passing 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 inside of the shielding tube 3 from the ineffective X-rays (see the dotted line indicated by X1 in fig. 1) generated by the anode assembly 9 and the stray X-rays (see the dotted line indicated by X2 in fig. 1) generated by the target surface overflowing electrons, and completely prevent the ineffective X-rays and the stray X-rays from being transmitted to the insulating medium 13 located between the vacuum tube 2 and the mounting box 1, thereby effectively protecting the devices such as the high-voltage generating circuit, the electron emitter driving circuit, the solid insulating device and the like integrated inside the mounting box 1, and improving the service life of the X-ray source. The target surface spill-over electrons may be one or a combination of backscattered electrons, secondary electrons, and auger electrons.
That is, by configuring the above-mentioned inter-housing shielding window assembly suitable for the X-ray source, the effective X-ray X3 generated by the above-mentioned anode assembly 9 can be emitted from the vacuum region 41 to the non-vacuum region 42 only through the airtight window 4, and does not pass through the insulating medium of the X-ray source any more, so that the intensity of the X-ray is improved, and the stray X-ray is reduced, thereby improving the imaging quality of the X-ray, reducing the thickness requirement on the housing shielding layer 12 of the X-ray source, and simultaneously preventing components such as a high voltage circuit immersed in the insulating medium from being irradiated by the X-ray, and prolonging the service life of the X-ray source.
Still further, the cathode assembly 8 and the anode assembly 9 spaced from the cathode assembly 8 are disposed in the vacuum tube 2, and the anode assembly 9 is sleeved with the anode sleeve 93 having an X-ray outlet, so that a high-voltage ignition risk between the shielding tube and the anode assembly including the anode sleeve can be prevented when the X-ray tube is operated.
Therefore, the shielding window assembly between the inner shell and the outer shell, which is suitable for the X-ray source, can prevent the X-rays generated by the anode assembly 9 from being influenced by attenuation and scattering caused by the insulating medium 13 of the X-ray source on an emission path, prevent ineffective X-rays and stray X-rays generated by the 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 shielding layer 12 of the box body of the X-ray source, improve the imaging quality of the whole system of the X-rays, prolong the service life of the X-ray source, prevent the risk of high-voltage ignition between the shielding tube and the anode assembly 9 comprising the anode sleeve 93 when the X-ray tube works, and reduce the radiation to people.
Further, in order to further reduce the risk of high voltage ignition, the shielding tube 3 and the anode sleeve 93 form a preset gap 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 a partial vacuum region in the vacuum tube 2, so that the risk of high voltage ignition is prevented from being generated between the shielding tube 3 and the anode assembly 9 including the anode sleeve 93 when the X-ray tube works.
By setting that the X-ray exit aperture of the shielding tube 3 is larger than that of the anode sleeve 93, the ineffective X-rays X1 and the stray X-rays X2 generated by the anode assembly 9 and transmitted through the sleeve body window 94 are shielded and attenuated by the shielding tube 3 of the shielding tube, thereby further ensuring that the ineffective X-rays X1 and the stray X-rays X2 do not enter the insulating medium 13 in the X-ray source housing 11.
The shield tube 3 includes a shield tube body 34, and the shield tube body 34 may 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 shield body 34 may also be made of an electrically insulating material, which may be a polymer material containing an oxide of a highly attenuating material, such as an epoxy containing lead oxide or bismuth oxide. So arranged, the inactive X-rays and the stray X-rays generated from the anode assembly 9 are attenuated by the shielding tube body 34, i.e., the inactive X-rays and the stray X-rays are shielded within the lumen of the shielding tube body 34, thereby preventing the inactive X-rays and the stray X-rays from entering the insulating medium 13.
As shown in fig. 1, in order to facilitate the sealing communication 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 near the vacuum tube 2 is in airtight connection with the tube body opening 21 for sealing the vacuum region 41, and the other end of the sealing ring 5 is in airtight connection with a step structure on the assembly ring 6, so that the sealing ring can be used for sealing the vacuum region 41. For example, one end of the sealing ring 5 is in vacuum sealing fit with the pipe body opening 21 through a glass fusion sealing welding process, and the other end of the sealing ring 5 is in vacuum sealing fit with the assembly ring 6 through brazing or argon arc welding; the above-mentioned sealing ring 5 is made of kovar alloy.
As shown in fig. 2, in order to prevent the problem of ignition of the sealing portion between the sealing ring 5 and the vacuum tube 2 with respect 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 a direction approaching the vacuum tube 2, for example, the protruding length L is 1-3mm.
As shown in fig. 2 and 3, in order to facilitate the installation of the airtight window 4 inside the shielding tube 3, the shielding tube 3 further includes an assembly ring 6, and an outer circumferential wall of the assembly ring 6 is in fluid-tight connection with an inner circumferential wall of the shielding tube body 34, so that leakage of the insulating medium 13 outside the installation box 1 through a gap between the shielding tube body 34 and the sealing ring 5 can be avoided; the airtight window 4 is hermetically sealed in the fitting ring 6. The outer peripheral wall of the fitting ring 6 is stepped, the fitting ring 6 has a first stepped portion, a second stepped portion, and a third stepped portion, the diameters of which are sequentially reduced, the first stepped portion is fitted in the shield pipe body 34, the second stepped portion abuts against the above-mentioned seal ring 5 in a direction parallel to the axial direction of the shield pipe body 34, the third stepped portion is fitted in the seal ring 5, and further, the fitting ring 6 is hermetically connected to the seal ring 5 by brazing or argon arc welding or the like for sealing the vacuum region 41. The fitting ring 6 also has a hooked edge for hooking the airtight window 4, which is restrained and airtight-connected to the airtight window 4 on one side by brazing or diffusion welding or the like.
In order to facilitate the fixing of the shield tube 3 to the housing 11, the shield tube 3 includes a shield tube body 34 and a nozzle mount 7, the nozzle mount 7 is fluid-tightly coupled to an outer peripheral wall of the shield tube body 34, and the nozzle mount 7 is fluid-tightly coupled to the mounting box 1 to prevent leakage of the insulating medium 13 out of the mounting box 1, and the nozzle mount 7 is detachably and hermetically coupled to the housing 11 through a coupling assembly (e.g., bolts, screws) and an O-ring.
In order to ensure the attenuation effect of the shielding tube 3 on the ineffective X-rays and the stray X-rays, the shielding tube 3 includes a shielding tube body 34, the shielding tube body 34 is made of an X-ray shielding material having high X-ray attenuation characteristics, the X-ray shielding material is one or a combination of tungsten, lead, bismuth, a lead alloy, a tungsten alloy, a bismuth alloy, and a polymer material containing a metal oxide, and a metal element of the metal oxide is one of tungsten, lead, and bismuth.
Also, in order to ensure the attenuation effect of the shielding tube 3 against the ineffective X-rays and the stray X-rays, the equivalent lead thickness of the shielding tube body 34 is 2-10mm. The equivalent lead thickness is related to the tube voltage value of the X-ray tube.
In order to further prevent the high-pressure sparking phenomenon between the shielding pipe body 34 and the anode assembly 9 and/or the cathode assembly 8, the shielding pipe body 34 is provided with a sparking preventing chamfer 33 near the port edge of the vacuum pipe. The chamfer radius of the anti-sparking chamfer 33 may be 1-6mm, the chamfer radius being related to the tube voltage value of the X-ray tube.
Also, in order to further prevent the high-pressure sparking phenomenon between the shield tube body 34 and the anode assembly 9 and/or the cathode assembly 8, the surface roughness of the shield tube body 34 is not more than 0.6. Specifically, the surface of the shield tube body 34 needs to be polished in order to remove the tip burrs on the surface thereof, preventing high-pressure ignition between the shield tube body 34 and the anode assembly 9 and/or the cathode assembly 8.
When the material for manufacturing the shielding tube body 34 is an electrically insulating material, the surface of the shielding tube body 34 is coated with a metal film in order to protect the sealing portion between the sealing ring 5 and the vacuum tube 2 and reduce the electric field intensity at the sealing portion. The metal film prevents the above-mentioned problem of sparking at the seal of the sealing ring 5 with the vacuum tube 2 with respect to the anode assembly 9 and/or the cathode assembly 8.
The present invention also provides an X-ray source comprising:
the shielding window assembly between the inner shell and the outer shell, which is suitable for the X-ray source;
a case shielding layer 12, the case shielding layer 12 being provided on the surface of the case 11;
an insulating medium 13, wherein the insulating medium 13 fills a cavity defined by the case 11, the vacuum tube 2 and the shielding tube 3;
and devices such as a high voltage generation circuit, an electron emitter driving circuit, and a solid insulation device, which are integrated inside the installation case 1 and immersed by the insulation medium 13.
In the X-ray source of the present invention, the thickness of the case shielding layer 12 is made thinner by disposing the above-mentioned inter-inner-outer-case shielding window assembly applied to the X-ray source, so that the insulating medium 13 is not affected by scattering and dissipation of X-rays.
In summary, the present invention can prevent the ineffective X-rays and the stray X-rays generated by the anode assembly from entering the insulating medium of the X-ray source, prevent the effective X-rays X3 generated by the anode assembly from being affected by attenuation and scattering caused by the insulating medium of the X-ray source on the emission path, reduce the stray X-rays generated on the emission path, improve the X-ray intensity, improve the imaging quality of the whole system of the X-rays, reduce the thickness requirement of the shielding layer of the case of the X-ray source, prevent the components such as the high voltage circuit immersed in the insulating medium 13 from being irradiated by the X-rays, prolong the service life of the X-ray source, prevent the risk of high voltage ignition between the shielding tube and the anode assembly including the anode sleeve during the operation of the X-ray tube, and reduce the radiation to people. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (12)
1. An inter-housing shield window assembly for an X-ray source, comprising:
the X-ray radiation device comprises a mounting box (1), wherein the mounting box (1) comprises a box shell (11), and a box body opening (111) allowing X-rays to be emitted is formed in the box shell (11);
the vacuum tube (2), the vacuum tube (2) locates the inner chamber of the case (11), there is tube body opening (21) which allows X-ray to shoot out and aligns with opening (111) of the case on the vacuum tube (2); a cathode assembly (8) and an anode assembly (9) which is arranged at intervals with the cathode assembly (8) are arranged in the vacuum tube (2), and an anode sleeve (93) with an X-ray outlet is sleeved on the anode assembly (9);
the shielding tube (3) with the X-ray shielding function, the two ends of the shielding tube (3) along the axial direction are respectively an inner side port (31) facing the vacuum tube (2) and an outer side pipe orifice (32) facing the case shell (11), the inner side port (31) is hermetically communicated with the tube body opening (21) to isolate a vacuum area (41) positioned at the inner side of the vacuum tube (2) and an insulating medium (13) positioned between the vacuum tube (2) and the mounting case (1), the outer side pipe orifice (32) is in liquid-tight communication with the case opening (111) to prevent the insulating medium (13) positioned between the vacuum tube (2) and the mounting case (1) from leaking out of the mounting case (1), an airtight window piece (4) is arranged in the shielding tube (3), and the airtight window piece (4) is used for enabling an inner side space positioned in the airtight window piece (4) to form the vacuum area (41) and enabling an outer side space positioned in the airtight window piece (4) to form a non-vacuum area (42).
2. The inter-housing shield window assembly for an X-ray source of claim 1, wherein: the shielding pipe (3) comprises a shielding pipe body (34) and a sealing ring (5), the sealing ring (5) is sleeved in the shielding pipe body (34), and one end, close to the vacuum pipe (2), of the sealing ring (5) is in airtight connection with the pipe body opening (21).
3. The inter-housing shield window assembly for an X-ray source of claim 2, wherein: one end of the shielding pipe body (34) protrudes out of the sealing ring (5) towards the direction close to the vacuum pipe (2) and has the length of 1-3mm.
4. The inter-housing shield window assembly for an X-ray source of claim 2, wherein: the shielding pipe (3) further comprises an assembling ring (6), the assembling ring (6) is in airtight connection and fit with the sealing ring (5), and the assembling ring (6) is in liquid-tight connection and fit with the shielding pipe body (34); the airtight window piece (4) is arranged in the assembly ring (6) in an airtight manner.
5. The inter-housing shield window assembly for an X-ray source of claim 1, wherein: the shielding pipe (3) comprises a shielding pipe body (34) and a pipe orifice mounting piece (7), the pipe orifice mounting piece (7) is connected with the peripheral wall of the shielding pipe body (34) in a liquid-tight mode, and the pipe orifice mounting piece (7) is connected with the box shell (11) in a detachable liquid-tight mode through a connecting assembly.
6. The inter-housing shield window assembly for an X-ray source of claim 1, wherein: the shielding tube (3) comprises a shielding tube body (34), wherein the shielding tube body (34) is made of an X-ray shielding material with high X-ray attenuation characteristic, the X-ray shielding material is one or a combination of tungsten, lead, bismuth, lead alloy, tungsten alloy, bismuth alloy and a high polymer material containing metal oxide, and the metal element of the metal oxide is one of tungsten, lead and bismuth.
7. The inter-housing shield window assembly for an X-ray source of claim 1, wherein: the shielding pipe (3) comprises a shielding pipe body (34), and the equivalent lead thickness of the shielding pipe body (34) is 2-10mm.
8. The inter-housing shield window assembly for an X-ray source of claim 1, wherein: the shielding pipe (3) comprises a shielding pipe body (34), and an anti-ignition chamfer (33) is arranged at the edge of the port of the shielding pipe body (34) close to the vacuum pipe (2).
9. The inter-housing shield window assembly for an X-ray source of claim 1, wherein: the shielding pipe (3) comprises a shielding pipe body (34), and the surface roughness of the shielding pipe body (34) is not more than 0.6.
10. The inter-housing shield window assembly for an X-ray source of claim 1, wherein: the shielding pipe (3) comprises a shielding pipe body (34), and the surface of the shielding pipe body (34) is plated with a metal film when the material of the shielding pipe body is an electric insulating material.
11. The inter-housing shield window assembly for an X-ray source according to claim 1, wherein the X-ray exit aperture of the shield tube (3) is larger than the X-ray exit aperture of the anode sleeve (93).
12. An X-ray source, comprising:
an inter-housing shield window assembly for an X-ray source as claimed in any one of claims 1 to 11;
the box body shielding layer (12), the box body shielding layer (12) is arranged on the surface of the box shell (11);
an insulating medium (13), wherein the insulating medium (13) is filled in a cavity defined by the case (11), the vacuum tube (2) and the shielding tube (3);
and a circuit device and a solid insulation device integrated inside the installation box (1) and immersed by the insulation medium (13).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310982292.2A CN116705579B (en) | 2023-08-07 | 2023-08-07 | Internally and externally shielded window assembly suitable for X-ray source and X-ray source |
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| CN202310982292.2A CN116705579B (en) | 2023-08-07 | 2023-08-07 | Internally and externally shielded window assembly suitable for X-ray source and X-ray source |
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| CN116705579B true CN116705579B (en) | 2023-09-29 |
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| DE102008038582A1 (en) * | 2008-08-21 | 2010-02-25 | Siemens Aktiengesellschaft | X-ray |
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| CN116705579A (en) | 2023-09-05 |
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