Adjustable electron gun structure

Abstract

The utility model discloses an adjustable electron gun structure, which relates to the technical field of electronic devices and comprises a cathode assembly, an anode and a shell assembly. The cathode assembly and the anode are both located in the shell assembly, a sleeve is further arranged in the shell assembly, and the cathode assembly can move on the sleeve in the axis direction of the sleeve; a metal column is inserted into the sleeve, and a cathode connecting wire in the cathode assembly is lapped on the metal column; the anode is located below the cathode assembly, and the anode can move on the shell assembly in the axis direction of the shell assembly. Through the cooperation of the cathode assembly, the anode, the sleeve and the shell assembly, the distance between the cathode assembly and the anode can be adjusted according to the actual production requirement, the requirements of different use scenes are met, and good applicability is achieved. And moreover, the production cost of producers is reduced, the supply period is shortened, and the workload of workers is relieved. In addition, the structural design is simple, operation of workers is facilitated, and good practicability is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electronic devices, in particular to an adjustable electron gun structure. Background Art

[0002] As a product that emits electrons, electron guns have been used in many fields. However, with the increase in usage scenarios, the requirements for electron gun emission performance have also become diversified, such as the thickness of the electron beam waist and the distance of the range. This has resulted in the need to design an electron gun corresponding to the slight change in the usage scenario, which not only wastes certain design resources, but also increases production costs and the workload of staff.

[0003] The electron beam outlet of a traditional electron gun is flush with the positioning surface, which means that there are certain requirements for the thickness of the electron beam waist and the range, which limits the range of scenarios in which the electron gun can be used.

[0004] Therefore, it is necessary to design an adjustable electron gun to reduce the dependence on the electron gun emission performance design, so that some electron guns whose original performance does not match the usage scenarios can be correctly used in the corresponding scenarios. Utility Model Content

[0005] In response to the above problems, the purpose of the utility model is to provide an adjustable electron gun structure, which solves the problem that the traditional electron gun has limited usage scenarios and cannot adjust its performance accordingly with slight changes in the usage scenarios, resulting in waste of design resources and increased production costs and workload of staff.

[0006] The technical solution adopted by the utility model is as follows: an adjustable electron gun structure, comprising a cathode assembly, an anode and a shell assembly; the cathode assembly and the anode are both located in the shell assembly, and a sleeve is also provided in the shell assembly, and the cathode assembly can move along the axial direction of the sleeve; a metal column is inserted in the sleeve, and a cathode connecting line in the cathode assembly is overlapped on the metal column; the anode is located below the cathode assembly, and the anode can move along the axial direction of the shell assembly on the shell assembly.

[0007] Furthermore, the sleeve and the cathode assembly are connected via threads.

[0008] Furthermore, an operating hole is provided on the sleeve, and the operating hole corresponds to the overlapping end of the cathode connecting wire.

[0009] Furthermore, an electron beam outlet is provided at the bottom center of the anode.

[0010] Furthermore, the housing assembly includes a first shell and a second shell which are sequentially connected from top to bottom, a connecting cover is installed on the first shell, and the sleeve is welded to the thin wall on the connecting cover.

[0011] Furthermore, the anode and the second shell are connected via threads.

[0012] Furthermore, the end surface of the second shell is a positioning surface, and the positioning surface is used as a reference surface to determine the distance of the electron beam waist emitted from the electron beam outlet.

[0013] Furthermore, the anode is in a cap structure.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0015] The adjustable electron gun structure, through the coordination of the cathode assembly, anode, sleeve and shell assembly, enables the cathode assembly and the anode to be adjusted in distance according to actual production needs, and has good applicability. By changing the distance between the two, when the cathode assembly and the anode are adjusted in the same direction, the electron beam range is changed; when the cathode assembly and the anode are adjusted in opposite directions, the magnitude of the electron gun emission current changes. It also reduces the production cost of the producer, and there is no need to re-process and design. It only needs to be adjusted to meet the needs of the user before supplying, which greatly shortens the supply cycle and reduces the workload of the staff. In addition, the structure is simple in design, easy for the staff to operate, and has good practicality.

[0016] According to the traditional process, in terms of design, the electron gun production unit needs to design according to the requirements of the electron gun usage scenario, which requires more design resources and a longer delivery cycle. With this solution, the two existing electron guns can theoretically meet the application scenarios, which saves a certain amount of design resources. In production, the newly designed electron gun may need to produce four more complex special-shaped parts such as anode and cathode assemblies (cathode head, filament, focusing electrode, anode) of new sizes. However, with this solution, there is no need to process parts, only some process operations are required, so that parts processing is saved and the delivery cycle is shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 Structural schematic diagram provided for the embodiment of the utility model

[0019] Description of the drawings: 1. First shell; 2. Second shell; 3. Connection cover; 4. Sleeve; 5. Metal column; 6. Operation hole; 7. Cathode connecting wire; 8. Thin wall; 9. Cathode assembly; 10. Anode; 11. Electron beam outlet; 12. Mounting groove; 13. Positioning surface. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] Combine the following Figure 1 The utility model is described in detail.

[0024] Example

[0025] Depend on Figure 1 It can be seen that an adjustable electron gun structure includes a cathode assembly 9, an anode 10 and a shell assembly; the cathode assembly 9 and the anode 10 are both located in the shell assembly, and a sleeve 4 is also provided in the shell assembly, a metal column 5 is inserted in the sleeve 4, and a cathode connecting wire 7 in the cathode assembly 9 is overlapped on the metal column 5; the metal column 5 is used to extend the cathode connecting wire 7 so that an external circuit can be connected.

[0026] Among them, the cathode assembly 9 includes a cathode and a filament. The filament is generally a tungsten filament. After being energized and heated, a large number of hot electrons are generated on the surface. Under the action of the high-voltage electric field between the anode 10 and the cathode, the hot electrons are accelerated to move at high speed toward the anode 10 and obtain very high kinetic energy. Its specific speed value depends on the level of the acceleration voltage, which can generally reach about two-thirds of the speed of light. A bunching electrode can also be set between the cathode and the anode 10, and by applying a specific voltage and shape design, the focus and shape of the electron beam can be further regulated to meet specific application requirements.

[0027] The housing assembly includes a first housing 1 and a second housing 2 connected in sequence from top to bottom. A connection cover 3 is installed on the first housing 1, and a sleeve 4 is welded to a thin wall 8 on the connection cover 3. The housing assembly is assembled and spliced ​​by the first housing 1, the second housing 2 and the connection cover 3, which is not only convenient for integrated processing, but also convenient for transportation and carrying. In order to ensure high-temperature sealing, the first housing 1, the second housing 2 and the connection cover 3 can be connected by welding.

[0028] Furthermore, the cathode assembly 9 can move in the axial direction on the sleeve 4; the anode 10 is located below the cathode assembly 9, and the anode 10 can also move in the axial direction on the second shell 2 in the housing assembly. There are many ways of axial movement, such as threaded transmission, linear guide rails and sliders, hydraulic or pneumatic transmission, etc. However, in the technical field, considering the production and processing costs and practicality, threaded transmission is preferred.

[0029] Furthermore, the axial movement between the sleeve 4 and the cathode assembly 9 is achieved by the threaded fit between the sleeve 4 and the cathode assembly 9. The sleeve 4 is also provided with an operation hole 6, which corresponds to the overlap position of the cathode connecting wire 7 on the metal column 5.

[0030] When the distance of the cathode assembly 9 needs to be adjusted, the thin wall 8 can be removed by boring, turning, milling and other processes, so as to take out the sleeve 4 with the cathode assembly 9 and the metal column 5, and then the cathode connecting wire 7 can be peeled off the metal column 5 from the operation hole 6. Since the sleeve 4 and the cathode assembly 9 are threaded, the staff can adjust the height of the cathode assembly by hand. After adjustment, the cathode connecting wire 7 is re-spot welded from the operation hole 6, and then the sleeve 4 is put back to its original position, and the uppermost thin wall 8 welding edge is re-welded. After all adjustments, it is necessary to measure whether the required height is reached before proceeding to the next assembly step.

[0031] Furthermore, the axial movement between the anode 10 and the second shell 2 in the housing assembly is achieved by threaded fit between the anode 10 and the second shell 2. A mounting groove 12 for screwing the anode 10 is also provided at the bottom of the anode 10. A wrench is inserted into the mounting groove 12, and the anode 10 is rotated by the wrench, which saves time and effort, similar to the principle of a lever.

[0032] When the distance of the anode 10 needs to be adjusted, an external tool wrench can be used to insert the wrench into the installation slot 12, and the anode 10 can be rotated with the wrench so that the anode 10 threadedly connected to the second shell 2 can move axially, thereby changing the height of the anode 10. After adjustment, it is also necessary to measure whether the required height is reached before proceeding to the next step of assembly.

[0033] Furthermore, the anode 10 is in a cap structure, which is different from the plate-shaped anode in the existing electron gun structure. The cap structure of the anode 10 can ensure a certain sealing performance and realize the threaded connection between the anode 10 and the second shell 2 to change the height of the anode 10.

[0034] In addition, an electron beam outlet 11 is provided at the bottom center of the anode 10, and the electron beam emitted by the electron gun is emitted from the electron beam outlet 11. The end surface of the second shell 2 is a positioning surface 13, which is used as a reference surface to determine the distance of the electron beam waist emitted from the electron beam outlet 11. The electron beam waist is the position where the electron beam flow is the thinnest.

[0035] When the cathode assembly 9 and the anode 10 are adjusted in the same direction and moved the same distance, the electron gun emission point can be extended or shortened relative to the positioning surface 13, that is, the range of the electron beam is changed.

[0036] For example, when the cathode assembly 9 and the anode 10 are simultaneously adjusted 2 mm outward from the electron gun, the electron beam outlet 11 protrudes a certain distance from the positioning surface 13, and the electron beam waist also extends 2 mm relative to the positioning surface. Therefore, the relative range of the electron beam is extended.

[0037] When the distance between the cathode assembly 9 and the anode 10 is adjusted in opposite directions, the emission current of the electron gun can be increased or decreased.

[0038] For example: the cathode assembly 9 is adjusted outward from the electron gun, and the anode 10 is adjusted inward from the electron gun, that is, the cathode assembly 9 and the anode 10 are close to each other, the distance between them is shortened, the electric field strength is enhanced, and the emission current will increase accordingly; similarly, the cathode assembly 9 and the anode 10 are moved away from each other, the distance between them is increased, the electric field strength is weakened, and the emission current will decrease accordingly.

[0039] When the performance of the electron gun still cannot meet the actual use needs, the appropriate cathode assembly 9 or anode 10 can be replaced at any time, and the cathode assembly 9 and the anode 10 can be replaced with the required models. There are many ways of combination, that is, the same cathode assembly 9 can be combined with different anodes 10, the same anode 10 can be combined with different cathode assemblies 9, and different cathode assemblies 9 can be combined with different anodes 10. In this way, greater variability of the electron gun performance can be achieved, multiple performances are integrated together, applicability is improved, production costs are reduced, and the workload of staff is reduced.

[0040] For example, when a user needs five electron guns with completely different performances, generally speaking, he will be required to purchase five traditional electron guns, each of which corresponds to one performance, and the cost will be five times higher. However, through this solution, only one electron gun and five cathode assemblies or anodes are needed to meet the usage requirements that can only be achieved by five traditional electron guns, and at the same time, the production cost and delivery cycle are saved exponentially.

[0041] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An adjustable electron gun structure, characterized in that: The invention comprises a cathode assembly (9), an anode (10) and a shell assembly; the cathode assembly (9) and the anode (10) are both located in the shell assembly, and a sleeve (4) is also provided in the shell assembly, and the cathode assembly (9) can move along the axial direction of the sleeve (4); a metal column (5) is inserted in the sleeve (4), and a cathode connecting line (7) in the cathode assembly (9) is overlapped on the metal column (5); the anode (10) is located below the cathode assembly (9), and the anode (10) can move along the axial direction of the shell assembly.

2. The adjustable electron gun structure according to claim 1, characterized in that: The sleeve (4) and the cathode assembly (9) are connected via threads.

3. The adjustable electron gun structure according to claim 1, characterized in that: The sleeve (4) is also provided with an operating hole (6), and the operating hole (6) corresponds to the overlapping end of the cathode connecting line (7).

4. The adjustable electron gun structure according to claim 1, characterized in that: An electron beam outlet (11) is provided at the bottom center of the anode (10).

5. The adjustable electron gun structure according to claim 1, characterized in that: The housing assembly comprises a first shell (1) and a second shell (2) which are connected in sequence from top to bottom; a connection cover (3) is mounted on the first shell (1); and a sleeve (4) is welded to a thin wall (8) on the connection cover (3).

6. The adjustable electron gun structure according to claim 5, characterized in that: The anode (10) and the second shell (2) are connected via threads.

7. The adjustable electron gun structure according to claim 5, characterized in that: The end surface of the second shell (2) is a positioning surface (13), and the positioning surface (13) is used as a reference surface to determine the distance of the electron beam waist emitted from the electron beam outlet (11).

8. The adjustable electron gun structure according to claim 1, characterized in that: The anode (10) is in a cap structure.

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