High power coaxial energy transmission window and assembly method thereof

Abstract

The application discloses a kind of high-power coaxial energy transmission windows and its assembling method in the field of microwave electric vacuum device, high-power coaxial energy transmission window includes coaxially arranged window porcelain welding piece, outer conductor, inner conductor, inner conductor sleeve and window ceramic;Window porcelain welding piece is set to the inner side of the upper portion of outer conductor, and is sealed and welded with outer conductor;Window ceramic is sealed and welded in the inner side of window porcelain welding piece, and inner conductor penetrates window ceramic and is sealed and welded with window ceramic;Inner conductor sleeve is set below window ceramic and is set to the outside of inner conductor, and there are gaps between inner conductor sleeve and inner conductor and window ceramic.The coaxial energy transmission window reduces the heat transmitted to window ceramic, reduces the risk of ceramic burst, so as to ensure that coaxial energy transmission window can work stably in high-power microwave device.

Description

Technical Field

[0001] This invention relates to the field of microwave vacuum electronic devices, and more specifically, to a high-power coaxial power window and its assembly method. Background Technology

[0002] The power transmission window is a crucial component of microwave vacuum electronic devices, ensuring the vacuum seal and microwave transmission performance. Coaxial power transmission structures are widely used in high-power pulsed microwave devices due to their small size and wide bandwidth. These structures typically consist of inner and outer conductors and a ceramic window. Microwave signals inevitably generate heat due to microwave losses as they pass through these conductors and the ceramic window. With the increasing power of vacuum devices, especially those with an average power exceeding 200W, the power transmission window often experiences ceramic cracking due to excessive heat. Therefore, the design of the high-power coaxial power transmission window directly affects the operational stability of high-power vacuum devices.

[0003] Therefore, there is an urgent need to provide a high-power coaxial power transmission window and its assembly method to solve the above-mentioned technical problems. Summary of the Invention

[0004] The purpose of this invention is to provide a high-power coaxial power transmission window and its assembly method, which can reduce the probability of ceramic cracking due to excessive heat.

[0005] To achieve the above objectives, a first aspect of the present invention provides a high-power coaxial power transmission window, the high-power coaxial power transmission window comprising a window ceramic welded component, an outer conductor, an inner conductor, an inner conductor sleeve, and a window ceramic, all coaxially arranged; the window ceramic welded component is disposed on the upper inner side of the outer conductor and is sealed and welded to the outer conductor; the window ceramic is sealed and welded to the inner side of the window ceramic welded component, the inner conductor penetrates the window ceramic and is sealed and welded to the window ceramic; the inner conductor sleeve is disposed below the window ceramic and sleeved outside the inner conductor, a gap is left between the inner conductor sleeve and the inner conductor, and a gap is also left between the inner conductor sleeve and the window ceramic, the size of the gap being smaller than the cutoff wavelength of the vacuum device.

[0006] Preferably, the materials of the window ceramic weldment, the outer conductor, and the inner conductor are 4J33 ceramic sealing alloy.

[0007] Preferably, the inner conductor sleeve is made of Mo1 material.

[0008] Preferably, the material of the window ceramic is alumina 99 ceramic.

[0009] Preferably, the window ceramic weldment, the inner conductor, and the window ceramic are all provided with a nickel surface layer.

[0010] The second aspect of this invention provides an assembly method for a high-power coaxial power transmission window. The method involves sequentially stacking and assembling the window ceramic welded component, outer conductor, inner conductor, inner conductor sleeve, and window ceramic of the high-power coaxial power transmission window. During assembly, coaxiality between parts must be ensured, and coaxial positioning fixtures can be used to assist in the assembly. Solder is installed at the gaps where welding is required. After the solder is installed, the entire assembly is brazed in a high-temperature furnace. The inner conductor sleeve is laser-spot-welded to the slow-wave structure of the microwave vacuum device to ensure welding strength.

[0011] According to the above technical solution, a split inner conductor structure design is adopted, that is, an inner conductor sleeve is installed outside the inner conductor, and the inner conductor sleeve does not contact the inner conductor and the window ceramic. When the microwave signal passes through the inner conductor, outer conductor and window ceramic, the heat generated by microwave loss is mainly concentrated on the inner conductor sleeve, which reduces the heat transferred to the window ceramic, reduces the risk of ceramic cracking, and thus ensures that the coaxial power transmission window can work stably in high-power microwave devices.

[0012] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0014] Figure 1 This is a structural schematic diagram of one embodiment of the present invention.

[0015] Explanation of reference numerals in the attached figures

[0016] 1-Window ceramic welding component, 2-Outer conductor, 3-Inner conductor, 4-Inner conductor sleeve, 5-Window ceramic. Detailed Implementation

[0017] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0018] This invention provides a high-power coaxial power transmission window, which includes a window ceramic welded component 1, an outer conductor 2, an inner conductor 3, an inner conductor sleeve 4, and a window ceramic 5, all coaxially arranged. The window ceramic welded component 1 is disposed on the upper inner side of the outer conductor 2 and is sealed and welded to the outer conductor 2. The window ceramic 5 is sealed and welded to the inner side of the window ceramic welded component 1, and the inner conductor 3 passes through the window ceramic 5 and is sealed and welded to the window ceramic 5. The inner conductor sleeve 4 is disposed below the window ceramic 5 and sleeved on the outer side of the inner conductor 3. A gap is left between the inner conductor sleeve 4 and the inner conductor 3, and a gap is also left between the inner conductor sleeve 4 and the window ceramic 5. The size of the gap is smaller than the cutoff wavelength of the microwave vacuum device to prevent microwave leakage.

[0019] Compared with traditional coaxial power windows, the high-power coaxial power window of this invention adopts a split structure design for the inner conductor 3. That is, an inner conductor sleeve 4 is installed outside the inner conductor 3, and the inner conductor sleeve 4 does not contact the inner conductor 3 or the window ceramic 5. When the microwave signal passes through the inner conductor 3, the outer conductor 2 and the window ceramic 5, the heat generated by microwave loss is mainly concentrated on the inner conductor sleeve 4, which reduces the heat transferred to the window ceramic 5, reduces the risk of ceramic cracking, and thus ensures that the coaxial power window can work stably in high-power microwave devices.

[0020] In this embodiment, the materials of the window ceramic welding component 1, the outer conductor 2, and the inner conductor 3 are 4J33 ceramic sealing alloy, which can be matched and sealed with ceramic to ensure the airtightness of the welding.

[0021] In this embodiment, the inner conductor sleeve 4 is made of Mo1 material, molybdenum and molybdenum alloy plate, which has a high melting point and stable mechanical and chemical properties, ensuring the stability of hot operation.

[0022] In this embodiment, the material of the window ceramic 5 is alumina 99 ceramic to ensure mechanical strength.

[0023] In this embodiment, the window ceramic welding component 1, the inner conductor 3, and the window ceramic 5 are all provided with a nickel surface layer, that is, a layer of nickel is plated on the surface of the components to improve corrosion resistance and wear resistance.

[0024] The second aspect of this invention provides an assembly method for a high-power coaxial power transmission window. The method involves sequentially stacking and assembling the window ceramic weldment 1, outer conductor 2, inner conductor 3, inner conductor sleeve 4, and window ceramic 5. During assembly, coaxiality between parts must be ensured, and coaxial positioning fixtures can be used to assist in the assembly. Solder is installed at the gaps where welding is required. After the solder is installed, the entire assembly is brazed in a high-temperature furnace. The inner conductor sleeve 4 is laser-spot-welded to the slow-wave structure of the microwave vacuum device to ensure welding strength.

[0025] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0026] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0027] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A high-power coaxial energy transmission window, characterized in that, The high-power coaxial power transmission window includes a window ceramic welded component (1), an outer conductor (2), an inner conductor (3), an inner conductor sleeve (4), and a window ceramic (5) arranged coaxially. The window ceramic welded component (1) is disposed on the upper inner side of the outer conductor (2) and is sealed and welded to the outer conductor (2). The window ceramic (5) is sealed and welded to the inner side of the window ceramic welded component (1). The inner conductor (3) passes through the window ceramic (5) and is sealed and welded to the window ceramic (5). The inner conductor sleeve (4) is made of Mo1 material, disposed below the window ceramic (5), and spaced outside the inner conductor (3). A first gap is left between the inner conductor sleeve (4) and the inner conductor (3), and a second gap is left between the inner conductor sleeve (4) and the window ceramic (5). The size of the first gap and the second gap is smaller than the vacuum cutoff wavelength corresponding to the working frequency band of the high-power coaxial power transmission window.

2. The high-power coaxial energy transmission window according to claim 1, characterized in that, The materials of the window ceramic welded part (1), the outer conductor (2) and the inner conductor (3) are 4J33 ceramic sealing alloy.

3. The high-power coaxial power transmission window according to claim 1, characterized in that, The material of the window ceramic (5) is alumina 99 ceramic.

4. The high-power coaxial energy transmission window according to claim 1, characterized in that, The window ceramic welded component (1), the inner conductor (3), and the window ceramic (5) are all provided with a nickel surface layer.

5. A method for assembling a high-power coaxial energy transmission window, characterized in that, The window ceramic welded part (1), outer conductor (2), inner conductor (3), inner conductor sleeve (4) and window ceramic (5) of the high-power coaxial power transmission window described in any one of claims 1-4 are stacked and assembled in sequence. During assembly, coaxial positioning fixtures are required to assist in assembly to ensure coaxiality between parts. Solder is installed at the gaps where welding is required. After the solder is installed, it is placed in a high-temperature furnace for overall brazing. The inner conductor sleeve (4) is laser spot welded to the slow-wave structure of the microwave vacuum device to ensure welding strength.

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