CN212542344U - Cathode assembly for circumferential irradiation ray tube - Google Patents
Cathode assembly for circumferential irradiation ray tube Download PDFInfo
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- CN212542344U CN212542344U CN202021865940.4U CN202021865940U CN212542344U CN 212542344 U CN212542344 U CN 212542344U CN 202021865940 U CN202021865940 U CN 202021865940U CN 212542344 U CN212542344 U CN 212542344U
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Abstract
The utility model discloses a cathode component for a circumferential irradiation ray tube, which comprises a grid, wherein the grid is of a net-shaped cylindrical structure or a cage-shaped structure, the inner side of the grid comprises a cathode, and the cathode is connected with a cathode connecting structure; the cathode connecting structure is rod-shaped or tubular, the upper ends of the grid and the cathode connecting structure are both connected with the fairing, and the lower ends of the grid and the cathode connecting structure are both connected with the insulating part. The utility model discloses need to solve traditional cathode assembly's structure and mainly to the X fluorescent tube for the formation of image of little focus, charged particle is drawn forth to the unilateral, and it can't satisfy this problem of circumference irradiation X-ray tube, has adopted annular cathode assembly, and at first the intermediate position of whole cathode assembly sets up negative pole connection structure, and both ends set up the terminal about the negative pole connection structure, and two terminals are used for inserting different electrodes respectively, negative pole connection structure has adopted shaft-like or tubulose, and even separates the negative pole for whole negative pole inboard is cyclic annular, and the outside of negative pole sets up the grid of tubular structure or cage structure.
Description
Technical Field
The utility model relates to a physics electron field, concretely relates to a negative pole subassembly for circumference irradiation ray tube.
Background
Irradiation sources having good performance and easy to use are required for various irradiation apparatuses involved in the fields of medical treatment, industry, and the like. Conventionally, radioactive isotopes and high-energy electron accelerators are generally used as irradiation sources, but the former has strict management and control due to greater risks, and the latter has large, complicated and extremely high-cost equipment. Therefore, the newly developed irradiation source adopts the ray tube as the irradiation source, and the problems can be effectively solved. The cathode assembly is one of the core components of the tube, and the quality of the cathode assembly determines the overall performance of the tube to a large extent. The traditional cathode assembly is mainly used for an imaging X-ray tube with a small focus, charged particles are led out from one side, the requirement of a circumferential irradiation X-ray tube cannot be met, and the tube requires that electron beams are uniformly led out at 360 degrees in the circumferential direction.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that the charged particle is drawn forth to the formation of image of little focus mainly to traditional cathode assembly's structure, unilateral, and it can't satisfy circumference irradiation X-ray tube, and the purpose is providing a cathode assembly who is used for circumference irradiation ray tube, and the structure of solving traditional cathode assembly is mainly to the formation of image of little focus and is used the X-ray tube, and charged particle is drawn forth to the unilateral, and it can't satisfy circumference irradiation X-ray tube's problem.
The utility model discloses a following technical scheme realizes:
a cathode assembly for a circumferential irradiation ray tube comprising an apertured grid electrode of cylindrical or cage configuration, said cylindrical configuration being a hollow cylinder; the cage-shaped structure is a hollow cylinder, the outer side surface of the cylinder is in any shape, the inner side of the grid comprises a cathode, and the cathode is connected with a cathode connecting structure; the cathode connecting structure is rod-shaped or tubular, the rod-shaped comprises a straight rod and a bent rod, the tubular comprises a bent pipe and a straight pipe, the upper ends of the grid and the cathode connecting structure are both connected with the fairing, and the lower ends of the grid and the cathode connecting structure are both connected with the insulating part. The utility model discloses need to solve traditional cathode assembly's structure mainly to the X-ray tube for the formation of image of little focus, charged particle is drawn forth to the unilateral, and it can't satisfy this problem of circumference irradiation X-ray tube, adopted annular cathode assembly, at first the intermediate position of whole cathode assembly sets up the negative pole connection structure, and both ends set up the terminal about the negative pole connection structure, and two terminals are used for inserting different electrodes respectively, negative pole connection structure has adopted shaft-like or tubulose, and even with the negative pole separately, make whole negative pole inboard be cyclic annular, the outside of negative pole sets up the grid of cylinder structure or cage structure, further confirms the cyclic annular in the negative pole outside; the whole structure is annular and circumferential, the requirement of uniformly leading out electron beams in the circumferential direction by 360 degrees is met, the extremely large leading-out area can be realized, the effective radiation range of the irradiation tube is ensured, the production work efficiency is improved, and the defects of the traditional technology are overcome.
The eyelet of grid is the through-hole structure, and the through-hole includes inner aperture and outer aperture, the inner aperture is located the grid inner wall, outer aperture is located the grid outer wall, inner aperture and outer aperture directly communicate with each other, form netted grid structure. Therefore, the cathode in the grid can be effectively protected from the impact of particle back-bombardment under the condition of ensuring the circumferential emission area, the service life of the cathode is prolonged, and the production work efficiency is improved.
The grid and the cathode connecting structure are made of any refractory metal. Further, as the utility model discloses an optimal scheme, the negative pole connection structure is preferred to be selected from molybdenum, tantalum, the three kinds of materials of tungsten and is made, and the grid is preferred to be selected from two kinds of materials of molybdenum or graphite and is made.
Generally refers to a metal having a melting point above 1650 c and a certain reserve, and also refers to a metal having a melting point above that of zirconium as a refractory metal. An alloy formed by adding other elements to these metals as a base is called a refractory metal alloy. Refractory metals used for manufacturing structural materials resistant to high temperatures above 1093 ℃ are mainly tungsten, molybdenum, tantalum and niobium. Among refractory metal alloys, molybdenum alloy is the alloy which is used as the structural material at the earliest time, and Mo-0.5Ti-0.1Zr-0.02C alloy has good high-temperature strength and low-temperature plasticity and is widely applied in industry.
The cathode is cylindrical in overall structure and adopts a filament cathode. For example, the present invention is applied to an X-ray tube, and a filament cathode may be used. The filament cathode is in any one of spiral, net, silk and cage shapes. Such a shape is to ensure circumferential emission of the charged particle beam.
The fairing is a charged particle beam fairing, and the insulating part is an insulating support part for feeding high voltage; furthermore, as the preferred scheme of the utility model, cooperate with a grid section of thick bamboo and charged particle beam radome structure, can adjust the electric field distribution in the ray tube on the one hand, control particle bombardment scope and homogeneity on the target surface, be favorable to realizing the even particle emission of circumference, improve whole pipe radiation uniformity and reliability; secondly, the grid structure prevents the cathode from being influenced by ion back-bombardment, and ensures the service life of the cathode. The standard electric vacuum process is adopted comprehensively, and the reliability of the assembly in the long-term stable work of the ray tube is ensured.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
1. the utility model relates to a cathode assembly for circumferential irradiation ray tube, overall structure is annular, the negative pole of circumference, has guaranteed 360 evenly to draw forth the demand of electron beam in circumference, can realize very big area of drawing forth, guarantees the effective radiation range of irradiation pipe, has improved production work efficiency;
2. the utility model relates to a cathode assembly for circumferential irradiation ray tube, which can adjust the electric field distribution in the ray tube, control the bombardment range and uniformity of particles on the target surface, is favorable for realizing the uniform particle emission in circumferential direction, and improves the radiation uniformity and reliability of the whole tube;
3. the utility model relates to a cathode assembly for circumference irradiation ray tube, grid structure make the negative pole not receive the influence that the ion was back to the bombing, have guaranteed the life-span of negative pole. And the standard electric vacuum process is adopted comprehensively, so that the reliability of the long-term stable work of the assembly in the ray tube is ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic structural diagram of the present invention.
Reference numbers and corresponding part names in the drawings:
1-cathode, 2-grid, 3-cathode connection structure, 4-fairing, 5-insulator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail with reference to the following embodiments, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
As shown in fig. 1:
example 1:
the utility model relates to a cathode assembly for circumferential irradiation ray tube, which comprises a grid 2, wherein the grid 2 is a net-shaped cylindrical structure or a cage-shaped structure, the inner side of the grid 2 comprises a cathode 1, and the cathode 1 is connected with a cathode connecting structure 3; the cathode connecting structure 3 is rod-shaped or tubular, the upper ends of the grid 2 and the cathode connecting structure 3 are both connected with the fairing 4, and the lower ends of the grid 2 and the cathode connecting structure are both connected with the insulating part 5.
When in work: the fairing 4 and the cathode connecting structure 3 are made of molybdenum, tantalum, tungsten or other refractory metals, and the size of the fairing can ensure the structure and strength of the cathode 1 and the grid 2 and ensure the requirement of full distribution of the upper end surface electric field. The connection between the cathode 1 and the binding post of the cathode connecting structure 3 adopts welding or screw fixation and other modes. The grid 2 and the fairing 4 are fixed by welding. The fairing 4 and the cathode connecting structure 3 are fixed in a welding mode, the whole structure is an annular and circumferential cathode, and the requirement that the electron beams are uniformly led out in the circumferential direction by 360 degrees is met.
Example 2
A cathode component for a circumferential radiation ray tube comprises a grid 2, wherein the grid 2 is a net-shaped cylindrical structure or a cage-shaped structure, the inner side of the grid 2 comprises a cathode 1, and the cathode 1 is connected with a cathode connecting structure 3; the cathode connecting structure 3 is rod-shaped or tubular, the upper ends of the grid 2 and the cathode connecting structure 3 are both connected with the fairing 4, and the lower ends of the grid 2 and the cathode connecting structure are both connected with the insulating part 5. The grid 2 and the cathode connecting structure 3 are both made of any refractory metal. The cathode 1 is cylindrical in overall structure and adopts a filament cathode.
When the cathode assembly is adopted in an X-ray tube to work: the specially designed grid 2 can prevent a large amount of back-bombardment particles generated in the operation of the ray tube from bombarding the cathode to cause the life attenuation of the cathode, and ensures the high reliability of the operation of the assembly in the whole tube of the ray tube. The cathode 1 can adopt a filament structure in the application of an X-ray tube, uses pure tungsten materials, and selects the cross section size and the filament shape of the filament according to the performance of a filament power supply and the emission requirement of the X-ray tube. In order to ensure the reliability of the filament shape at the working temperature, if a single-spiral tungsten filament form is adopted, the filament diameter can be selected within the range of 0.2-0.5mm, and the overall spiral diameter can be selected within the range of 2-10 mm. The total length and the pitch of the filament spiral can be calculated according to the size of a radiation surface, required emission power and the like. Typical values are for example: when the diameter of the filament is 0.24mm, the number of turns is 10, the diameter of the spiral is 4mm, and the total length of the spiral is 50mm, the temperature of the filament is 2100K, and the milliampere-level emission capability can be achieved. The grid 2 is made of molybdenum or graphite or other refractory metals, the diameter of the grid is slightly larger than that of the cathode 1, and a gap of 0.5-3mm is ensured to be reserved between the grid and the cathode. The fairing 4 and the cathode connecting structure 3 are made of molybdenum, tantalum, tungsten or other refractory metals, and the size of the fairing can ensure the structure and strength of the cathode 1 and the grid 2 and ensure that the upper end face is closed. The connection between the cathode 1 and the binding post of the cathode connecting structure 3 adopts welding or screw fixation and other modes. The grid 2 and the fairing 4 are fixed by welding. And the fairing 4 and the cathode connecting structure 3 are fixed in a welding mode. The whole structure is an annular and circumferential cathode, and the requirement of uniformly leading out electron beams in a circumferential direction of 360 degrees is met.
Example 3
A cathode component for a circumferential radiation ray tube comprises a grid 2, wherein the grid 2 is a net-shaped cylindrical structure or a cage-shaped structure, the inner side of the grid 2 comprises a cathode 1, and the cathode 1 is connected with a cathode connecting structure 3; the cathode connecting structure 3 is rod-shaped or tubular, the upper ends of the grid 2 and the cathode connecting structure 3 are both connected with the fairing 4, and the lower ends of the grid 2 and the cathode connecting structure are both connected with the insulating part 5. The grid 2 and the cathode connecting structure 3 are both made of any refractory metal. The cathode 1 is cylindrical in overall structure and adopts a filament cathode. The filament cathode is in any one of spiral, net, silk and cage shapes. The fairing 4 is a charged particle beam fairing, and the insulating part 5 is fed with a high-voltage insulating support part.
When the cathode assembly is adopted in an X-ray tube to work: if the anode grounding mode is used, after a proper suspended negative high-voltage current is introduced into the cathode 1 through a high-voltage feed-in electrode in the insulating part 5, an electron beam is directly emitted, and the beam is emitted out of a hole of the grid 2, accelerated to move along an electric field built in the tube and finally bombarded on the anode. The specially designed grid 2 can prevent a large amount of back-bombardment particles generated in the operation of the ray tube from bombarding the cathode to cause the life attenuation of the cathode, and ensures the high reliability of the operation of the assembly in the whole tube of the ray tube. The cathode 1 can adopt a filament structure in the application of an X-ray tube, uses pure tungsten materials, and selects the cross section size and the filament shape of the filament according to the performance of a filament power supply and the emission requirement of the X-ray tube. In order to ensure the reliability of the filament shape at the working temperature, if a single-spiral tungsten filament form is adopted, the filament diameter can be selected within the range of 0.2-0.5mm, and the overall spiral diameter can be selected within the range of 2-10 mm. The total length and the pitch of the filament spiral can be calculated according to the size of a radiation surface, required emission power and the like. Typical values are for example: when the diameter of the filament is 0.24mm, the number of turns is 10, the diameter of the spiral is 4mm, and the total length of the spiral is 50mm, the temperature of the filament is 2100K, and the milliampere-level emission capability can be achieved. The grid 2 is made of molybdenum or graphite or other refractory metals, the diameter of the grid is slightly larger than that of the cathode 1, and a gap of 0.5-3mm is ensured to be reserved between the grid and the cathode. The fairing 4 and the cathode connecting structure 3 are made of molybdenum, tantalum, tungsten or other refractory metals, and the size of the fairing can ensure the structure and strength of the cathode 1 and the grid 2 and ensure the requirement of full distribution of the upper end surface electric field. The connection between the cathode 1 and the binding post of the cathode connecting structure 3 adopts welding or screw fixation and other modes. The grid 2 and the fairing 4 are fixed by welding. And the fairing 4 and the cathode connecting structure 3 are fixed in a welding mode. The whole structure is an annular and circumferential cathode, and the requirement of uniformly leading out electron beams in a circumferential direction of 360 degrees is met.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A cathode assembly for a circumferential irradiation tube, comprising: the device comprises a grid (2) with holes, wherein the grid (2) is of a cylindrical structure or a cage-shaped structure, the inner side of the grid (2) comprises a cathode (1), and the cathode (1) is connected with a cathode connecting structure (3); the cathode connecting structure (3) is rod-shaped or tubular, the upper ends of the grid (2) and the cathode connecting structure (3) are both connected with the fairing (4), and the lower ends of the grid and the cathode connecting structure are both connected with the insulating part (5).
2. A cathode assembly for a circumferential irradiation tube as set forth in claim 1, wherein: the eyelet of grid (2) is the through-hole structure, and the through-hole includes inner aperture and outer aperture, the inner aperture is located grid (2) inner wall, outer aperture is located grid (2) outer wall, inner aperture and outer aperture directly communicate with each other.
3. A cathode assembly for a circumferential irradiation tube as set forth in claim 1, wherein: the cathode (1) is spiral, net-shaped, filiform or cage-shaped, and can adopt a filament cathode.
4. A cathode assembly for a circumferential irradiation tube as set forth in claim 1, wherein: the grid (2) and the cathode connecting structure (3) are both made of any refractory metal.
5. A cathode assembly for a circumferential irradiation tube as set forth in claim 1, wherein: the whole structure of the grid (2) is cylindrical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021865940.4U CN212542344U (en) | 2020-08-31 | 2020-08-31 | Cathode assembly for circumferential irradiation ray tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021865940.4U CN212542344U (en) | 2020-08-31 | 2020-08-31 | Cathode assembly for circumferential irradiation ray tube |
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| Publication Number | Publication Date |
|---|---|
| CN212542344U true CN212542344U (en) | 2021-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021865940.4U Active CN212542344U (en) | 2020-08-31 | 2020-08-31 | Cathode assembly for circumferential irradiation ray tube |
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| CN (1) | CN212542344U (en) |
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Effective date of registration: 20230906 Address after: Room 215, Complex Building, No. 9, Huashan Middle Road, Xinbei District, Changzhou City, Jiangsu Province, 213000 Patentee after: Changzhou Huashu Technology Co.,Ltd. Address before: Room 1407, 14 / F, unit 1, building 7, No.399, Fucheng avenue west section, Chengdu hi tech Zone, 610000 China (Sichuan) pilot Free Trade Zone, Chengdu, Sichuan Province Patentee before: Chengdu Ruiming Hesheng Technology Co.,Ltd. |