Focusing enhanced nanometer cold cathode tube
By thickening the gate plate and setting a smooth arc surface to improve the electric field distribution, the problem of insufficient voltage withstandness of nano-scale cold cathode tubes is solved, and the effect of miniaturization and high voltage withstandness is achieved.
Patent Information
- Application Number
- CN202422392885.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-09-30
AI Technical Summary
Due to the defects in the internal structure design of the existing nano-scale cold cathode tubes, the electric field distribution is uneven and the voltage resistance is insufficient, which affects the stability and intensity of the rays, making it difficult to achieve miniaturization.
By thickening the thickness of the gate plate to 3 mm and setting a smooth arc surface at the edge of the gate hole, the electric field distribution is improved, the tip discharge is reduced, and the withstand voltage value is improved.
The withstand voltage value of the cold cathode tube is increased to 250~300kV, a small volume and large voltage design is realized, and the cost-effectiveness of the equipment is improved.
Smart Images
Figure CN223181073U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ray generating devices of flaw detectors, in particular to a focusing enhanced nano-cold cathode tube. Background Technique
[0002] With the continuous development of technology in the field of X-ray flaw detection, nano-level cold cathode tubes have received increasing attention. Each production and R & D enterprise is increasingly pursuing the miniaturization of the volume of the cold cathode tube while hoping for a higher withstand voltage value. However, for the existing nano-level cold cathode tubes, due to certain defects in their internal structure design, such as the relatively thin thickness of the grid plate and insufficient focusing performance, and the chamfer design is adopted in many places inside the long and short ceramic tubes, resulting in the situation of tip discharge, the internal electric field distribution is not very uniform, and the withstand voltage performance is insufficient, making it difficult to improve the stability and intensity of ray generation. This further leads to the difficulty in reducing the volume of the entire cold cathode tube, affecting the improvement of cost performance. Content of the Utility Model
[0003] The purpose of the utility model is to provide a focusing enhanced nano-cold cathode tube aiming at the above situation. Through structural improvement, the electric field distribution inside the cold cathode tube can be effectively improved, and the withstand voltage value can be increased.
[0004] The specific scheme of the utility model is: a focusing enhanced nano-cold cathode tube, which successively includes an anode head, a long ceramic tube, a short ceramic tube and a copper flange. An inclined target is installed in the anode head, the copper flange is connected to the end of the short ceramic tube, and a cathode focusing head is installed inside the copper flange. A grid plate is arranged at the butt joint of the long ceramic tube and the short ceramic tube. An outer ring of the grid plate is sleeved with a grid ring, and the grid ring is simultaneously sleeved on the outer walls at the butt joint of the ends of the long ceramic tube and the short ceramic tube and connects the two into one body. The thickness of the grid plate is 3 mm, a grid hole is opened at the center of the grid plate, and a first smooth circular arc surface is arranged at the hole edge of the grid hole.
[0005] Further, in the utility model, the end outer wall of the copper flange and the short ceramic tube are connected into one body by an upper ring, the cathode focusing head is placed inside the short ceramic tube and is threadedly connected to the copper flange, and a second smooth circular arc surface is arranged on the inner side wall at the end of the short ceramic tube.
[0006] Further, in the utility model, one end of the long ceramic tube and the outer wall of the anode head are connected into one body by an upper ring, the end of the anode head is placed inside the long ceramic tube, and a third smooth circular arc surface is arranged on the inner side wall at the end of the long ceramic tube close to the anode head.
[0007] Further, in the utility model, a fourth smooth circular arc surface is arranged outside the front end of the anode head.
[0008] Furthermore, in the present utility model, the grid plate includes an inner ring plate and an outer ring plate, with the outer ring plate sleeved outside the inner ring plate. The thickness of the inner ring plate is 3 mm, and the thickness of the outer ring plate is 1 - 1.5 mm.
[0009] Furthermore, on the outer wall of the front end of the cathode focusing head in the present utility model, there is provided a circle of fifth smooth circular arc surfaces.
[0010] Furthermore, in the present utility model, the inclined target is arranged at the center of the end of the anode head through screws, and the inclined target is embedded in the center part of the end of the anode head.
[0011] Furthermore, in the present utility model, the outer diameters of the long ceramic tube, the short ceramic tube, the copper flange, and the grid ring are kept consistent.
[0012] In the present utility model, through local improvement of the internal structure, especially the improvement of the thickness of the grid plate, the original thickness of 0.8 mm is increased to 3 mm, and the middle grid hole is set as a smooth circular arc surface, so that the focusing effect of the grid plate is greatly improved; in addition, the design of circular arc surfaces is carried out for each internal connection part, improving the electric field distribution, making the distribution more uniform, reducing the occurrence of tip discharge, and increasing the withstand voltage value of the entire cold cathode tube, reaching up to 250 - 300 kV, achieving the purpose of small volume and high voltage, and having good practical application value. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 is the overall structural schematic diagram of the present utility model;
[0014] Figure 2 is the structural schematic diagram in the main sectional direction of the present utility model;
[0015] Figure 3 is the structural schematic diagram of the grid plate in the present utility model;
[0016] Figure 4 is Figure 3 the structural schematic diagram in the A - A direction in
[0017] Figure 5 is the structural schematic diagram of the anode head in the present utility model;
[0018] Figure 6 is Figure 5 the structural schematic diagram in the B - B direction in
[0019] Figure 7 is the structural schematic diagram of the cathode focusing head in the present utility model;
[0020] Figure 8 is Figure 7 the structural schematic diagram in the C - C direction in
[0021] In the figure: 1 - ray window, 2 - anode head, 3 - long ceramic tube, 4 - grid coil, 5 - short ceramic tube, 6 - copper flange, 7 - inclined target, 8 - upper ring, 9 - third smooth arc surface, 10 - fourth smooth arc surface, 11 - fifth smooth arc surface, 12 - cathode focusing head, 13 - second smooth arc surface, 14 - grid plate, 15 - grid hole, 16 - outer ring plate, 17 - inner ring plate, 18 - first smooth arc surface. Specific implementation mode
[0022] Next, the technical solution of the present utility model will be clearly and completely described in conjunction with the drawings of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present utility model. In the description of the present utility model, it should be noted that the terms "upper", "lower", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model or simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.
[0023] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0024] See Figures 1 to 8, the utility model is a focusing-enhanced nano-cold cathode tube, which successively includes an anode head 2, a long ceramic tube 3, a short ceramic tube 5 and a copper flange 6. An inclined target 7 is installed in the anode head. The copper flange is connected to the end of the short ceramic tube, and a cathode focusing head 12 is installed inside the copper flange. A grid plate 14 is arranged at the butt joint of the long ceramic tube and the short ceramic tube. A grid ring 4 is sleeved outside the grid plate. The grid ring is simultaneously sleeved on the outer walls of the butted ends of the long ceramic tube and the short ceramic tube and connects the two into one body. The thickness of the grid plate is 3 mm. A grid hole 15 is opened at the center of the grid plate, and a first smooth circular arc surface 18 is arranged at the hole edge of the grid hole. Further, in the utility model, the copper flange and the outer wall of the end of the short ceramic tube are integrally connected by an upper ring 8. The cathode focusing head is placed inside the short ceramic tube and is threadedly connected to the copper flange. A second smooth circular arc surface 13 is arranged on the inner side wall of the end of the short ceramic tube. Further, in the utility model, one end of the long ceramic tube and the outer wall of the anode head are integrally connected by an upper ring. The end of the anode head is placed in the long ceramic tube. A third smooth circular arc surface 9 is arranged on the inner side wall of the end of the long ceramic tube close to the anode head. Further, in the utility model, a fourth smooth circular arc surface 10 is arranged outside the front end of the anode head. Further, in the utility model, the grid plate includes an inner ring plate 17 and an outer ring plate 16. The outer ring plate is sleeved outside the inner ring plate. The thickness of the inner ring plate is 3 mm, and the thickness of the outer ring plate is 1-1.5 mm. Further, in the utility model, a fifth smooth circular arc surface 11 is arranged on the outer wall of the front end of the cathode focusing head. Further, in the utility model, the inclined target is installed at the center of the end of the anode head by screws, and the inclined target is embedded in the center part of the end of the anode head. Further, in the utility model, the outer diameters of the long ceramic tube, the short ceramic tube, the copper flange and the grid ring are kept the same.
[0025] The utility model is a local structural transformation of the existing cold cathode tube. The most important thing is to increase the thickness of the grid plate and design a chamfer angle at the edge of the grid hole, which will greatly enhance the focusing ability of electrons. Multiple rounded corners are designed at various places in the internal vacuum tube to reduce the situation of tip discharge, improve the magnetic field distribution, and increase the withstand voltage value of the whole component. The increase in the withstand voltage value can further reduce the volume of the whole device and better adapt to various application scenarios.
[0026] In the present utility model, through local improvement of the internal structure, especially the improvement of the thickness of the grid electrode plate, the original thickness of 0.8 mm is increased to 3 mm, and the middle grid hole is set as a smooth arc surface, so that the focusing effect of the grid electrode plate is greatly improved; in addition, the design of arc surfaces is carried out for each internal connection part, which improves the electric field distribution, makes the distribution more uniform, reduces the occurrence of tip discharge, improves the withstand voltage value of the whole cold cathode tube, and reaches up to 250 - 300 kV, achieving the purpose of small volume and high voltage, and having good practical application value.
Claims
1. A focusing enhanced nano-cold cathode tube, successively comprising an anode head, a long ceramic tube, a short ceramic tube and a copper flange. An inclined target is installed in the anode head, the copper flange is connected to the end of the short ceramic tube, and a cathode focusing head is installed inside the copper flange. It is characterized in that: A grid plate is provided at the butt joint of the long ceramic tube and the short ceramic tube. A grid ring is sleeved on the outer ring of the grid plate. The grid ring is simultaneously sleeved on the outer walls of the butt joints at the ends of the long ceramic tube and the short ceramic tube and connects the two into one body. The thickness of the grid plate is 3 mm. A grid hole is opened at the center of the grid plate, and first smooth circular arc surfaces are provided at the hole edges of the grid hole.
2. The focused enhanced nano-cold cathode tube according to claim 1, characterized in that: The copper flange is integrally connected with the outer wall of the end of the short ceramic tube by an upper ring. The cathode focusing head is placed inside the short ceramic tube and is threadedly connected to the copper flange. A second smooth circular arc surface is provided on the inner side wall of the end of the short ceramic tube.
3. A focusing enhanced nano-cold cathode tube according to claim 1, characterized in that: One end of the long ceramic tube is integrally connected with the outer wall of the anode head through an upper ring. The end of the anode head is placed in the long ceramic tube, and a third smooth circular arc surface is provided on the inner side wall of the end of the long ceramic tube close to the anode head.
4. A focusing-enhanced nano-cold cathode tube according to claim 1, characterized in that: A fourth smooth circular arc surface is provided on the outer part of the front end of the anode head.
5. A focusing-enhanced nano-cold cathode tube according to claim 1, characterized in that: The grid plate includes an inner ring plate and an outer ring plate. The outer ring plate is sleeved outside the inner ring plate. The thickness of the inner ring plate is 3 mm, and the thickness of the outer ring plate is 1 - 1.5 mm.
6. The focusing enhanced nano-cold cathode tube according to claim 1, characterized in that: A fifth smooth circular arc surface is provided on the outer wall of the front end of the cathode focusing head.
7. A focusing enhanced nano-cold cathode tube according to claim 1, wherein: The inclined target is placed at the center of the end of the anode head through screws, and the inclined target is embedded in the center part of the end of the anode head.
8. A focusing-enhanced nano-cold cathode tube according to claim 1, characterized in that: The outer diameters of the long ceramic tube, the short ceramic tube, the copper flange, and the grid ring are kept consistent.