Near-three-intersection-point slotted pressure-resistant ceramic structure

Abstract

The utility model discloses a nearly three-intersection slotted voltage-withstanding ceramic structure, which belongs to the technical field of voltage-withstanding ceramic structures and comprises an anode, one side of the anode is connected with voltage-withstanding ceramic, the other side of the voltage-withstanding ceramic is connected with a cathode, and a groove is arranged on the top side in the voltage-withstanding ceramic. According to the ceramic voltage-resistant electrode structure, the field intensity of the adjacent three intersection point positions is changed by utilizing discontinuous change of dielectric constants of ceramic and an environment medium interface through the arranged grooves, so that the electric field effect of the structure in the using process is reduced, the electronic field emission is inhibited, and the sparking probability of the ceramic voltage-resistant electrode structure in the using process is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of pressure-resistant ceramic structures, in particular to a nearly three-intersection grooved pressure-resistant ceramic structure. Background Art

[0002] The X-ray tube is the core component for generating X-rays in industrial CT. X-ray penetrating power is positively correlated with X-ray energy, and the voltage between the cathode and anode of the X-ray tube directly determines the energy of the X-ray. High-voltage ceramic metal X-ray tubes are designed to meet the current industrial demand for increasing penetrating power. Typically, the single-ended voltage (the voltage between the cathode and anode) reaches over 160kV and can reach a maximum of over 450kV.

[0003] In X-ray tubes, the cathode and anode are insulated with voltage-resistant ceramic. Insufficient insulation can cause the electric field at the cathode-ceramic-vacuum triple intersection (hereinafter referred to as the triple intersection) to be too strong, causing electrons to escape the metal. The escaping electrons bombard the ceramic to form secondary electrons, and through the secondary electron multiplication effect, a conductive path is formed between the cathode and anode, causing sparks and flashes, leading to X-ray tube failure. To increase the voltage resistance, the most direct method is to increase the ceramic volume and increase the insulation distance between the electrodes. However, as the voltage reaches 160kV, the engineering benefits of increasing the insulation distance are decreasing. Not only does the improvement in insulation performance per unit increase in insulation distance decrease, but it also significantly increases the volume and weight of the X-ray tube.

[0004] Therefore, for high-voltage ceramic metal X-ray tubes, if the electric field at the three intersections is too strong and a large number of electrons are emitted, an electron conduction path will be formed on the ceramic surface, causing discharge and sparking, which will affect the inter-electrode voltage resistance and performance of the voltage-resistant ceramic structure. Utility Model Content

[0005] The purpose of the present utility model is to propose a near-three-intersection slotted pressure-resistant ceramic structure in order to solve the problem in the prior art that if the electric field at the three-intersection point is too strong and a large number of electrons are emitted, an electron conduction path will be formed on the ceramic surface, causing discharge and sparking, which will affect the inter-electrode pressure-resistant performance of the pressure-resistant ceramic structure.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A nearly three-point grooved pressure-resistant ceramic structure comprises an anode, one side of the anode is connected to a pressure-resistant ceramic, the other side of the pressure-resistant ceramic is connected to a cathode, and a groove is provided on the top side of the pressure-resistant ceramic.

[0008] As a further description of the above technical solution:

[0009] Three intersections are provided at the junction of the pressure-resistant ceramic and the cathode, and both the cathode and the anode are made of metal.

[0010] As a further description of the above technical solution:

[0011] The cross section of the groove is set to be rectangular, and the groove is set on a side opposite to the three intersection points.

[0012] As a further description of the above technical solution:

[0013] The groove and slot depth and slot width can be determined by simulation calculation according to actual needs.

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

[0015] 1. In the present invention, by setting grooves, the discontinuous change of the dielectric constant of the interface between ceramic and the ambient medium is utilized to change the field strength at the adjacent three-intersection position, thereby reducing the electric field effect of the structure during use, so as to suppress electron field emission, thereby reducing the probability of ignition of the ceramic withstand voltage electrode structure during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 This is a schematic diagram of the electric field simulation results of the three-intersection point of the unloaded slotted structure of the utility model;

[0018] Figure 3 This is a schematic diagram of the electric field simulation results at the three intersection points of the loaded slot structure of the utility model;

[0019] Figure 4 This is a schematic diagram of the traditional pressure-resistant ceramic structure in the utility model.

[0020] Legend:

[0021] 1. Anode; 2. Pressure-resistant ceramic; 3. Cathode; 4. Triple intersection; 5. Groove. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] See also Figure 1-Figure 4The utility model provides a technical solution: a near-three-intersection grooved pressure-resistant ceramic structure, including an anode 1, one side of the anode 1 is connected to a pressure-resistant ceramic 2, the other side of the pressure-resistant ceramic 2 is connected to a cathode 3, a groove 5 is provided on the top side of the pressure-resistant ceramic 2, a three-intersection 4 is provided at the junction of the pressure-resistant ceramic 2 and the cathode 3, the cathode 3 and the anode 1 are both made of metal, the cross-section of the groove 5 is set to a rectangle, and the groove 5 is set on the side opposite to the three-intersection 4, the groove 5 and the groove depth and groove width can be determined by simulation calculation according to actual needs.

[0024] Specific implementation method: The entire ceramic voltage-resistant electrode structure is connected to an external power supply device. At this time, due to the different dielectric constants of the ceramic material and the external environment in the traditional ceramic voltage-resistant electrode structure, and the small rounded corners at the edge of the ceramic material and the small gaps between the metal, the electric field is concentrated at this location. Therefore, the electric field near the triple intersection is usually stronger than at other locations, which easily causes electrons to escape from the cathode surface. In engineering, it is generally believed that the field strength is close to 1×10 7 V / m has a greater risk of ignition. This structure and the general structure are simulated. Both simulations use the same boundary conditions. The voltage between the anode 1 and the cathode 3 is 160kV, and the withstand voltage distance of the pressure-resistant ceramic 2 is 80mm. Figure 3 It can be seen that the electric field strength is about 9×10 6 , and this structure is as Figure 4 It can be seen that the structural difference is only the addition of a groove 5 near the cathode 3. The discontinuous change of the dielectric constant of the interface between the ceramic and the ambient medium is used to change the electric field strength at the adjacent triple intersection 4. The electric field strength is about 5×10 6 , reduced by about 40%, thereby reducing the electric field effect during use to suppress electron field emission, thereby reducing the probability of ignition of the ceramic voltage-resistant electrode structure during use.

[0025] Working principle: When in use, the ceramic voltage-resistant electrode structure is connected to an external power supply device. This structure and the general structure are simulated. Both simulations use the same boundary conditions. The voltage between the anode 1 and the cathode 3 is 160kV, and the voltage-resistant distance of the voltage-resistant ceramic 2 is 80mm. Figure 3 It can be seen that the electric field strength is about 9×10 6 , and this structure is as Figure 4 It can be seen that the structural difference is only the addition of a groove 5 near the cathode 3. The discontinuous change of the dielectric constant of the interface between the ceramic and the ambient medium is used to change the electric field strength at the adjacent triple intersection 4. The electric field strength is about 5×10 6 , reduced by about 40%, thereby reducing the electric field effect during use.

[0026] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A near-three-intersection slotted pressure-resistant ceramic structure, comprising an anode (1), characterized in that: One side of the anode (1) is connected to a pressure-resistant ceramic (2), the other side of the pressure-resistant ceramic (2) is connected to a cathode (3), and a groove (5) is provided on the top side of the pressure-resistant ceramic (2); A triple intersection (4) is provided at the junction of the pressure-resistant ceramic (2) and the cathode (3), and the groove (5) is provided on a side opposite to the triple intersection (4).

2. The near-three-intersection grooved pressure-resistant ceramic structure according to claim 1, characterized in that: The cathode (3) and the anode (1) are both made of metal.

3. The near-three-intersection grooved pressure-resistant ceramic structure according to claim 2, characterized in that: The cross section of the groove (5) is configured to be rectangular.

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