Microwave window

Abstract

The utility model discloses a microwave window, which relates to the technical field of microwave vacuum devices and comprises an oxygen-free copper waveguide and a ceramic window sheet welded on the inner side of the oxygen-free copper waveguide, an outer annular reserved groove is arranged on the outer side of the oxygen-free copper waveguide, and an inner annular reserved groove is arranged on the inner side of the oxygen-free copper waveguide. The outer annular preformed groove is located on the outer side of the position, where the inner annular preformed groove is formed, of the oxygen-free copper waveguide, the inner side of the outer annular preformed groove is fixedly connected with a first reinforcing ring in a sleeving mode, and the outer side of the oxygen-free copper waveguide is fixedly connected with a second reinforcing ring covering the outer annular preformed groove in a sleeving mode. In addition, the second reinforcing ring is matched with the first reinforcing ring, so that the expansion amount of the oxygen-free copper waveguide can be further reduced, a gap between the ceramic window piece and the oxygen-free copper waveguide at a high temperature is reduced, the brazing quality is improved, and then it is guaranteed that the energy transmission window does not leak air under two or more barometric pressures.

Description

Technical Field

[0001] This utility model relates to the field of microwave vacuum device technology, and in particular to a microwave window. Background Technology

[0002] A klystron is a type of microwave tube that uses the movement of charged particles between electrodes in a vacuum to oscillate or amplify microwave signals. The output window in a klystron has two functions: first, to ensure vacuum isolation between the klystron and the external environment; and second, to efficiently transmit microwave energy to an external load. As microwave power levels increase, the electric field strength at the dielectric window of the output window increases dramatically, making it susceptible to high-frequency breakdown and damage. Therefore, it is necessary to develop klystron output windows with higher power capacity.

[0003] A search revealed that patent application CN201220129504.X discloses an S-band 10% bandwidth high-power klystron for generating high-power microwave output. The klystron includes an electron gun ceramic assembly, a transition section assembly, a lower magnetic screen, a tube housing, a resonant cavity, an output waveguide assembly, an output window assembly, a titanium pump assembly, a collector assembly, an input connector assembly, an upper magnetic screen, an anode, and an electron gun assembly. Under electromagnetic focusing and water cooling conditions, a high-power microwave output klystron capable of generating 10% bandwidth in the S-band was realized. Building upon this, to address the issue of window leakage, patent application CN201220434526.7 discloses a microwave power transmission window structure. This structure comprises an oxygen-free copper waveguide welded to a ceramic sheet. The oxygen-free copper waveguide section welded to the ceramic sheet is a thin-walled cylindrical structure, with the ceramic sheet located inside the thin-walled cylinder. A molybdenum sheet is mounted on the outer wall of the thin-walled cylinder, and molybdenum wire is wound around the surface of the molybdenum sheet. This microwave power transmission window structure ensures that the power transmission window remains leak-free under pressures exceeding two atmospheres, guaranteeing its vacuum tightness and further ensuring the performance of the microwave vacuum device.

[0004] Based on the above search and analysis of existing technologies, microwave windows similar to those disclosed above still require further improvement. For example, the oxygen-free copper waveguide section welded to the ceramic sheet is a thin-walled cylindrical structure, lacking reinforcement and thus relatively weak, making it prone to cracking or even breakage. Therefore, a microwave window is proposed to address these issues. Utility Model Content

[0005] The purpose of this application is to provide a microwave window to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution: a microwave window, comprising an oxygen-free copper waveguide and a ceramic window plate welded to the inner side of the oxygen-free copper waveguide:

[0007] The outer side of the oxygen-free copper waveguide is provided with an outer annular reserved groove.

[0008] The outer annular reserved groove is located outside the position where the inner annular reserved groove is located on the oxygen-free copper waveguide, and a first reinforcing ring is fixedly sleeved on the inner side of the outer annular reserved groove.

[0009] The outer side of the oxygen-free copper waveguide is fixedly fitted with a second reinforcing ring that covers the outer annular pre-reserved groove.

[0010] By adding a second reinforcing ring at the outer annular pre-reserved groove, the strength loss caused by the outer annular pre-reserved groove in the oxygen-free copper waveguide can be compensated. In addition, the second reinforcing ring, together with the first reinforcing ring, can further reduce the expansion of the oxygen-free copper waveguide, reduce the gap between the ceramic window and the oxygen-free copper waveguide at high temperatures, improve the brazing quality, and thus ensure that the power transmission window does not leak air under pressure of more than two atmospheres.

[0011] Preferably, the ceramic window is circular, and the oxygen-free copper waveguide and the first reinforcing ring are both tubular. The circular arrangement makes the microwave window more uniformly stressed.

[0012] Preferably, the inner side of the oxygen-free copper waveguide is provided with an inner annular reserved groove;

[0013] The diameter of the inner annular reserved groove is the same as the diameter of the ceramic window, and the ceramic window is embedded in the inner side of the oxygen-free copper waveguide. The embedded welding method between the ceramic window and the oxygen-free copper waveguide can increase the connection area between the ceramic window and the oxygen-free copper waveguide, thereby improving the airtightness.

[0014] Preferably, the ceramic window slab has an integrally formed widening protrusion ring at both edges of its circular surface;

[0015] The widening convex ring is fitted to the inner wall of the oxygen-free copper waveguide and welded to the inner wall of the oxygen-free copper waveguide; the widening convex ring can further increase the connection area between the ceramic window and the oxygen-free copper waveguide, thereby further improving the airtightness.

[0016] Preferably, the ceramic window and the widened convex ring are both coated with molybdenum metal on the surfaces of the inner wall of the oxygen-free copper waveguide to facilitate welding to the inner wall of the oxygen-free copper waveguide.

[0017] Preferably, the first reinforcing ring is a molybdenum sheet, and molybdenum wire is wound around the surface of the first reinforcing ring;

[0018] Furthermore, both the molybdenum wire and the surface of the first reinforcing ring are electroplated with a nickel layer, thus improving the fastening quality.

[0019] In summary, the technical effects and advantages of this utility model are as follows:

[0020] 1. In this utility model, by adding a second reinforcing ring at the outer annular pre-reserved groove, the strength loss caused by the outer annular pre-reserved groove of the oxygen-free copper waveguide can be compensated. In addition, the second reinforcing ring, together with the first reinforcing ring, can further reduce the expansion of the oxygen-free copper waveguide, reduce the gap between the ceramic window and the oxygen-free copper waveguide at high temperature, improve the brazing quality, and thus ensure that the power transmission window does not leak air under more than two atmospheres of pressure.

[0021] 2. In this utility model, by adopting an embedded welding method between the ceramic window and the oxygen-free copper waveguide, the connection area between the ceramic window and the oxygen-free copper waveguide can be increased, thereby improving the airtightness. By integrally setting a widening protrusion ring on both sides of the circular surface of the ceramic window and welding the widening protrusion ring to the inner wall of the oxygen-free copper waveguide, the widening protrusion ring can further increase the connection area between the ceramic window and the oxygen-free copper waveguide, thereby further improving the airtightness. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall three-dimensional structure in this embodiment;

[0024] Figure 2 This is a schematic diagram of the cross-sectional structure in this embodiment;

[0025] Figure 3 This is a schematic cross-sectional view of the structure in this embodiment;

[0026] Figure 4 for Figure 2 A schematic diagram of the split structure in the image.

[0027] In the figure: 1. Oxygen-free copper waveguide; 2. Ceramic window; 3. Inner annular pre-reserved groove; 4. Widened convex ring; 5. Outer annular pre-reserved groove; 6. First reinforcing ring; 7. Second reinforcing ring. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Example: Reference Figure 1-4 The microwave window shown includes an oxygen-free copper waveguide 1 and a ceramic window 2 welded to the inside of the oxygen-free copper waveguide 1.

[0030] Among them, an outer annular reserved groove 5 is provided on the outer side of the oxygen-free copper waveguide 1. The outer annular reserved groove 5 is located outside the position where the inner annular reserved groove 3 is provided on the oxygen-free copper waveguide 1. A first reinforcing ring 6 is fixedly sleeved on the inner side of the outer annular reserved groove 5, and a second reinforcing ring 7 covering the outer annular reserved groove 5 is fixedly sleeved on the outer side of the oxygen-free copper waveguide 1.

[0031] By adding a second reinforcing ring 7 at the outer annular pre-reserved groove 5, the strength loss caused by the setting of the outer annular pre-reserved groove 5 in the oxygen-free copper waveguide 1 can be compensated. In addition, the second reinforcing ring 7, together with the first reinforcing ring 6, can further reduce the expansion of the oxygen-free copper waveguide 1, reduce the gap between the ceramic window 2 and the oxygen-free copper waveguide 1 at high temperature, improve the brazing quality, and thus ensure that the power transmission window does not leak air under more than two atmospheres of pressure.

[0032] The first reinforcing ring 6 is a molybdenum sheet, and molybdenum wire is wound around the surface of the first reinforcing ring 6. Both the molybdenum wire and the surface of the first reinforcing ring 6 are electroplated with a nickel layer to improve the fastening quality.

[0033] Among them, the ceramic window 2 is circular, and the oxygen-free copper waveguide 1 and the first reinforcing ring 6 are both cylindrical. The circular arrangement makes the microwave window more uniformly stressed.

[0034] Furthermore, an inner annular pre-reserved groove 3 is provided on the inner side of the oxygen-free copper waveguide 1. The diameter of the inner annular pre-reserved groove 3 is the same as the diameter of the ceramic window 2. The ceramic window 2 is embedded in the inner side of the oxygen-free copper waveguide 1. The embedded welding method between the ceramic window 2 and the oxygen-free copper waveguide 1 can increase the connection area between the ceramic window 2 and the oxygen-free copper waveguide 1, thereby improving the airtightness.

[0035] Furthermore, an extended protruding ring 4 is integrally provided on both sides of the circular surface of the ceramic window 2. The extended protruding ring 4 is fitted to the inner wall of the oxygen-free copper waveguide 1 and welded to the inner wall of the oxygen-free copper waveguide 1. The extended protruding ring 4 can further increase the connection area between the ceramic window 2 and the oxygen-free copper waveguide 1, thereby further improving the airtightness.

[0036] Among them, the ceramic window 2 and the widened convex ring 4 are both provided with molybdenum metal coating on the surface of the inner wall of the oxygen-free copper waveguide 1 so as to facilitate smooth welding with the inner wall of the oxygen-free copper waveguide 1.

[0037] The working principle of this utility model is as follows: By adding a second reinforcing ring 7 at the outer annular pre-reserved groove 5, the strength loss caused by the outer annular pre-reserved groove 5 of the oxygen-free copper waveguide 1 can be compensated. In addition, the second reinforcing ring 7, together with the first reinforcing ring 6, can further reduce the expansion of the oxygen-free copper waveguide 1, reduce the gap between the ceramic window 2 and the oxygen-free copper waveguide 1 at high temperatures, improve the brazing quality, and thus ensure that the power transmission window does not leak air under more than two atmospheres of pressure. By adopting an embedded welding method between the ceramic window 2 and the oxygen-free copper waveguide 1, the connection area between the ceramic window 2 and the oxygen-free copper waveguide 1 can be increased, thereby improving the airtightness. By integrally setting a widening protrusion ring 4 on both sides of the circular surface of the ceramic window 2 and welding the widening protrusion ring 4 to the inner wall of the oxygen-free copper waveguide 1, the widening protrusion ring 4 can further increase the connection area between the ceramic window 2 and the oxygen-free copper waveguide 1, thereby further improving the airtightness.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A microwave window, comprising an oxygen-free copper waveguide (1) and a ceramic window (2) welded to the inner side of the oxygen-free copper waveguide (1), characterized in that: The outer side of the oxygen-free copper waveguide (1) is provided with an outer annular reserved groove (5). The oxygen-free copper waveguide (1) has an inner annular reserved groove (3) on its inner side. The diameter of the inner annular reserved groove (3) is the same as the diameter of the ceramic window (2), and the ceramic window (2) is embedded in the inner side of the oxygen-free copper waveguide (1). The outer annular reserved groove (5) is located outside the position where the inner annular reserved groove (3) is set on the oxygen-free copper waveguide (1), and a first reinforcing ring (6) is fixedly sleeved on the inner side of the outer annular reserved groove (5). The outer side of the oxygen-free copper waveguide (1) is fixedly fitted with a second reinforcing ring (7) that covers the outer annular reserved groove (5).

2. A microwave window according to claim 1, characterized in that: The ceramic window (2) is circular, and the oxygen-free copper waveguide (1) and the first reinforcing ring (6) are both tubular.

3. A microwave window according to claim 2, characterized in that: The ceramic window piece (2) has an integrated widening protrusion ring (4) at both edges of the circular surface. The widening convex ring (4) is fitted to the inner wall of the oxygen-free copper waveguide (1) and welded to the inner wall of the oxygen-free copper waveguide (1).

4. A microwave window according to claim 3, characterized in that: The ceramic window (2) and the widened convex ring (4) are both coated with molybdenum metal on the surfaces of the inner wall of the oxygen-free copper waveguide (1).

5. A microwave window according to any one of claims 1-4, characterized in that: The first reinforcing ring (6) is a molybdenum sheet, and molybdenum wire is wound around the surface of the first reinforcing ring (6); Furthermore, both the molybdenum wire and the surface of the first reinforcing ring (6) are electroplated with a nickel layer.

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