Hollow cathode electrode lead structure
By introducing an isolation layer into the connection design between the hollow cathode electrode lead structure and the cathode shell, the complexity and brittleness of ceramic-metal brazing were solved, thereby improving the yield of hollow cathodes.
Patent Information
- Application Number
- CN202520338980.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2035-02-28
AI Technical Summary
In existing aerospace electric propulsion systems, the lead posts on the cathode use a physical insulation technology of ceramic-metal brazing, which leads to a complex brazing process and makes the ceramic brittle, adsorbing metal ions and reducing the yield of hollow cathodes.
The structure includes a cathode housing, a first isolation layer, a first electrode lead, a first functional component, a second isolation layer, a second electrode lead, and a second functional component. The cathode housing is connected through the isolation layer, and the isolation layer provides electrical isolation from other components during the brazing process, thus preventing metal ion adsorption and improving the yield rate.
The design of the isolation layer ensures that ions generated during cathode operation are difficult to sputter into this area, preventing metal ion adsorption and improving the yield of hollow cathodes.
Smart Images
Figure CN223712702U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to hollow cathode technical field especially relates to a hollow cathode electrode lead structure. BACKGROUND
[0002] Traditional thermionic emission cathode mainly adopts simple wire or metal sheet structure, such as tungsten filament cathode, which is heated by current to reach high temperature and emit electrons, but the stability and efficiency of electron emission of traditional thermionic emission cathode are insufficient.
[0003] With the development of science and technology, people realize that the cathode structure has an important influence on electron emission performance, and the existing hollow cathode is an important component of Hall thruster, and the electrode lead is an essential part of the hollow cathode, including the heating electrode lead and the holding electrode lead, which functions to transfer external electric energy to the corresponding functional parts inside the hollow cathode, and the middle segment of the electrode lead is inserted into the ceramic to insulate the hollow cathode shell, which is a metal part, and the upper end of the ceramic is brazed with a lead cover to insulate the lead space, and the lower end of the ceramic is brazed with a lead lower cover and a lead rod welded together for external wiring, and the entire electrode lead is fixed on the hollow cathode shell by secondary brazing of the lead cover.
[0004] However, the lead column on the cathode in the existing aviation electric thruster system adopts ceramic and metal brazing physical insulation technology, which is complex in brazing process, and the ceramic is a brittle material that easily absorbs metal ions, thereby reducing the pass rate of the hollow cathode. UTILITY MODEL CONTENTS
[0005] The utility model aims at providing a hollow cathode electrode lead structure, which aims to solve the problem of low pass rate of the hollow cathode caused by the ceramic and metal brazing physical insulation technology of the lead column on the cathode in the existing aviation electric thruster system, which is complex in brazing process, and the ceramic is a brittle material that easily absorbs metal ions.
[0006] To achieve the above-mentioned purpose, the utility model provides a hollow cathode electrode lead structure, which comprises a cathode shell, a first isolation layer, a first electrode lead, a first functional part, a second isolation layer, a second electrode lead and a second functional part, the first isolation layer is connected with the cathode shell and located on one side of the cathode shell, the first electrode lead is connected with the first isolation layer and located on one side of the first isolation layer, the first functional part is connected with the first electrode lead and located on one side of the first electrode lead, the second isolation layer is connected with the cathode shell and located on one side of the cathode shell, the second electrode lead is connected with the second isolation layer and located on one side of the second isolation layer, and the second functional part is connected with the second electrode lead and located on one side of the second electrode lead.
[0007] The first electrode lead has a first connecting thread on one side thereof.
[0008] The second electrode lead has a second connecting thread on one side thereof.
[0009] The cathode shell has a first through hole on one side thereof close to the first electrode lead.
[0010] The cathode shell has a second through hole on one side thereof close to the second electrode lead.
[0011] The hollow cathode electrode lead structure of the utility model, when using hollow cathode, through the first electrode lead external heating electrode power supply provides heating voltage for hollow cathode, through the heater and heats the cathode to make it reach the ability of emitting electron, at the same time, through the second electrode lead external touch holding electrode power supply provides touch holding electrode voltage for hollow cathode, forms electric field at the cathode emission end, guarantees electron acceleration emission, at the same time, through the installation of the first isolation layer and the second isolation layer, it is isolated with other components, the first isolation layer and the second isolation layer make the gap with the certain width and length of the adjacent device structure, thereby make the ion produced in the cathode work very difficult to sputter to the area, further ensure the isolation effect of the isolation layer, thereby avoid adsorbing metal ion in the process of brazing through the isolation protection of the first isolation layer and the second isolation layer, further improve the qualified rate of hollow cathode. BRIEF DESCRIPTION OF DRAWINGS
[0012] In order to more clearly illustrate the technical scheme in the embodiments of the present application or prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced.
[0013] Figure 1 It is the structure schematic view of the hollow cathode electrode lead structure of the first embodiment of the utility model.
[0014] In the figure: 101-cathode shell, 102-first isolation layer, 103-first electrode lead, 104-first functional part, 105-second isolation layer, 106-second electrode lead, 107-second functional part, 108-first connecting thread, 109-second connecting thread, 110-first through hole, 111-second through hole. DETAILED DESCRIPTION
[0015] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, the embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.
[0016] The first embodiment of the present application is:
[0017] Please refer to Figure 1 , wherein Figure 1 is a structural schematic diagram of the hollow cathode electrode lead structure of the first embodiment of the present application.
[0018] The present application provides a kind of hollow cathode electrode lead structure, including cathode shell 101, first isolation layer 102, first electrode lead 103, first functional piece 104, second isolation layer 105, second electrode lead 106 and second functional piece 107, first electrode lead 103 has first connecting thread 108, second electrode lead 106 has second connecting thread 109, cathode shell 101 has first through hole 110, cathode shell 101 has second through hole 111.It is solved by the foregoing scheme that the lead column on cathode in the existing aviation electric propeller system is all used ceramic and metal brazing physical insulation technology, because brazing process is complex, and ceramic belongs to brittle material and is easy to absorb metal ion, so as to reduce the qualified rate of hollow cathode, it can be understood that the foregoing scheme can be used in the case where the qualified rate of hollow cathode needs to be improved.
[0019] In the present embodiment, when using hollow cathode, the first electrode lead 103 is connected to the heating electrode power supply to provide heating voltage for the hollow cathode, the heater is used to heat the cathode to make it reach the ability of emitting electrons, and the second electrode lead 106 is connected to the touch holding electrode power supply to provide touch holding electrode voltage for the hollow cathode, so as to form an electric field at the emission end of the cathode and ensure the acceleration and emission of electrons.
[0020] The first isolation layer 102 is connected with the cathode shell 101 and located on one side of the cathode shell 101, the first electrode lead 103 is connected with the first isolation layer 102 and located on one side of the first isolation layer 102, the first functional part 104 is connected with the first electrode lead 103 and located on one side of the first electrode lead 103, the second isolation layer 105 is connected with the cathode shell 101 and located on one side of the cathode shell 101, the second electrode lead 106 is connected with the second isolation layer 105 and located on one side of the second isolation layer 105, the second functional part 107 is connected with the second electrode lead 106 and located on one side of the second electrode lead 106, the first isolation layer 102 is arranged on the cathode shell 101, the first electrode lead 103 is arranged on the first isolation layer 102, the first electrode lead 103 can be mounted on the cathode shell 101 through the first isolation layer 102, the first functional part 104 is integrally connected and fixed on the first electrode lead 103, the first electrode lead 103 is a hollow cathode heating electrode, which provides power supply for the heater and also plays a supporting role, the first electrode lead 103 is formed by mechanical processing together with the first functional part 104, the first electrode lead 103 is brazed and mounted through the first isolation layer 102 and electrically isolated from other components, the first electrode lead 103 extends out of the cathode shell 101 by a certain height, the second isolation layer 105 is arranged on the cathode shell 101, the second electrode lead 106 is arranged on the second isolation layer 105, the second electrode lead 106 can be mounted on the cathode shell 101 through the second isolation layer 105, the second functional part 107 is integrally connected and fixed on the second electrode lead 106, the second electrode lead 106 is a hollow cathode contact electrode, the second electrode lead 106 is formed by mechanical processing together with the second functional part 107, the second electrode lead 106 is brazed and mounted through the second isolation layer 105 and electrically isolated from other components, the second electrode lead 106 extends out of the cathode shell 101 by a certain height, the first isolation layer 102 and the second isolation layer 105 are designed to have a certain width and length gap adjacent to the structure of the device, it is difficult for ions generated in the cathode to sputter to this area, ensuring the isolation effect of the isolation layer, thereby realizing that when the hollow cathode is used, the hollow cathode is provided with heating voltage through the external heating electrode power supply of the first electrode lead 103, the cathode is heated by the heater to reach the ability of emitting electrons, at the same time, the hollow cathode is provided with contact electrode voltage through the external contact electrode power supply of the second electrode lead 106, an electric field is formed at the cathode emission end to ensure electron acceleration and emission, at the same time, the first isolation layer 102 and the second isolation layer 105 are isolated from other components through installation, the first isolation layer 102 and the second isolation layer 105 have a certain width and length gap adjacent to the structure of the device,Thus, the ions generated in the cathode work are difficult to sputter to the area, thereby ensuring the isolation of the isolation layer, thereby avoiding the adsorption of metal ions in the process of brazing through the isolation protection of the first isolation layer 102 and the second isolation layer 105, thereby improving the qualified rate of the hollow cathode.
[0021] Secondly, the first connecting thread 108 is located on one side of the first electrode lead 103, the first electrode lead 103 can extend out of the cathode shell 101 by a certain height, and the first electrode lead 103 has the first connecting thread 108 at the end for external connection of a heating electrode power supply.
[0022] At the same time, the second connecting thread 109 is located on one side of the second electrode lead 106, the second electrode lead 106 can extend out of the cathode shell 101 by a certain height, and the second electrode lead 106 has the second connecting thread 109 at the end for external connection of a holding electrode power supply.
[0023] In addition, the first through hole 110 is located on one side of the cathode shell 101 close to the first electrode lead 103, the first through hole 110 can be a round hole or a square hole, and the first electrode lead 103 can extend out of the cathode shell 101 by a certain length through the first through hole 110, and the cathode shell 101 and the first electrode lead 103 have a certain insulation gap.
[0024] Finally, the second through hole 111 is located on one side of the cathode shell 101 close to the second electrode lead 106, the cathode shell has the second through hole 111, the second through hole 111 can be a round hole or a square hole, and the second electrode lead 106 can extend out of the cathode shell 101 by a certain length through the second through hole 111, and the cathode shell 101 and the second electrode lead 106 have a certain insulation gap.
[0025] When the hollow cathode electrode lead structure of the present embodiment is used, when the hollow cathode is used, the hollow cathode is provided with a heating voltage by the first electrode lead 103 externally connected to a heating electrode power supply, the cathode is heated by the heater to reach the ability of emitting electrons, at the same time, the hollow cathode is provided with a touch electrode voltage by the second electrode lead 106 externally connected to a touch electrode power supply, an electric field is formed at the cathode emission end to ensure the accelerated emission of electrons, at the same time, the first isolation layer 102 and the second isolation layer 105 are installed to be isolated from other components, the first isolation layer 102 and the second isolation layer 105 have a certain width and length gap adjacent to the device structure, so that the ions generated in the cathode work are difficult to sputter to this area, thereby ensuring the isolation effect of the isolation layer, thereby avoiding the adsorption of metal ions in the process of brazing through the isolation protection of the first isolation layer 102 and the second isolation layer 105, thereby improving the qualified rate of the hollow cathode.
[0026] The above disclosure is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of the rights of the present application. Those skilled in the art can understand that all or part of the above-mentioned embodiments are implemented, and equivalent changes made according to the claims of the present application still belong to the scope covered by the present application.
Claims
1. A hollow cathode electrode lead structure, characterized by, The hollow cathode electrode lead structure comprises a cathode shell, a first isolation layer, a first electrode lead, a first functional part, a second isolation layer, a second electrode lead and a second functional part, the first isolation layer is connected with the cathode shell and located on one side of the cathode shell, the first electrode lead is connected with the first isolation layer and located on one side of the first isolation layer, the first functional part is connected with the first electrode lead and located on one side of the first electrode lead, the second isolation layer is connected with the cathode shell and located on one side of the cathode shell, the second electrode lead is connected with the second isolation layer and located on one side of the second isolation layer, and the second functional part is connected with the second electrode lead and located on one side of the second electrode lead.
2. The hollow cathode electrode lead structure according to claim 1, wherein the first electrode lead has a first connecting thread located on one side of the first electrode lead.
3. The hollow cathode electrode lead structure according to claim 1, wherein the second electrode lead has a second connecting thread located on one side of the second electrode lead.
4. The hollow cathode electrode lead structure according to claim 1, wherein the cathode shell has a first through hole located on one side of the cathode shell close to the first electrode lead.
5. The hollow cathode electrode lead structure according to claim 1, wherein the cathode shell has a second through hole located on one side of the cathode shell close to the second electrode lead.