Resonant waveguide structure high power load

Abstract

The application discloses a resonant waveguide structure high-power load, which comprises a rectangular waveguide, one end of the rectangular waveguide is provided with a rectangular waveguide port, the other end of the rectangular waveguide is provided with a waveguide short-circuit plate, the waveguide short-circuit plate is welded to the other end of the rectangular waveguide, the inner side of the rectangular waveguide is symmetrically provided with a first ceramic tube and a second ceramic tube, the outer side of both ends of the first ceramic tube is fixedly provided with a first gasket, the outer side of both ends of the second ceramic tube is fixedly provided with a second gasket, the inner side of the first ceramic tube is provided with a first water body, and the inner side of the second ceramic tube is provided with a second water body. The resonant waveguide structure high-power load disclosed by the application has the advantages of small overall volume, simple structure, low production cost, relatively large peak power and continuous wave power, and can well meet the needs of high-power loads in the fields of large science and microwave heating.

Description

Technical Field

[0001] This invention relates to the field of high-power load technology, specifically a high-power load with a resonant waveguide structure. Background Technology

[0002] High-power loads are important auxiliary equipment in microwave systems. They are fully matched loads connected to the end of transmission lines, absorbing all the power transmitted to the end of the transmission line without reflection. In low-frequency applications, high-power ferrite absorption loads are commonly used. This type of load faces some insurmountable problems, such as the large number of ferrite sheets, making heat distribution difficult to be uniform, the ferrite sheets being prone to breakage, the relatively high cost and large size of ferrite loads, and the difficulty in manufacturing processes.

[0003] The absorption load used in the power source circulator of linear accelerators is generally a ferrite load, and the absorption power needs to reach the MW level. However, ferrite loads are expensive and bulky. In addition, high-power water loads are also needed in the field of microwave heating to absorb microwave energy, which also faces problems such as price and cost.

[0004] Therefore, there is an urgent need for a high-power load that is small in size, low in cost, and simple in structure in both the field of big science and microwave heating. Based on this, we propose a resonant waveguide structure high-power load to solve the shortcomings of existing technologies. Summary of the Invention

[0005] The purpose of this invention is to provide a high-power load with a resonant waveguide structure to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A resonant waveguide structure high-power load includes a rectangular waveguide. One end of the rectangular waveguide has a rectangular waveguide port, and the other end has a waveguide short-circuit plate welded to the other end of the rectangular waveguide. A first ceramic tube and a second ceramic tube are symmetrically arranged on the inner side of the rectangular waveguide. A first gasket is fixedly sleeved on the outer side of both ends of the first ceramic tube, and a second gasket is fixedly sleeved on the outer side of both ends of the second ceramic tube. A first water body is arranged on the inner side of the first ceramic tube, and a second water body is arranged on the inner side of the second ceramic tube.

[0008] The rectangular waveguide has horizontally penetrating through-holes on both sides, with corresponding mounting holes for installing the first and second washers.

[0009] The first washer and the second washer are respectively fixedly installed in the corresponding mounting through holes.

[0010] A metal block is welded to the bottom inner side of the rectangular waveguide.

[0011] The inner side of the rectangular waveguide is symmetrically provided with a first metal cylinder and a second metal cylinder.

[0012] The top and bottom ends of the first and second metal cylinders are fixedly connected to the top and bottom of the rectangular waveguide by bolts.

[0013] Both the first ceramic tube and the second ceramic tube are made of materials with mechanical strength and wave transmission properties.

[0014] Both the first ceramic tube and the second ceramic tube are made of alumina ceramic.

[0015] Both the first ceramic tube and the second ceramic tube are thin cylindrical shapes.

[0016] The rectangular waveguide, the first metal cylinder, the second metal cylinder, and the metal block are all made of aluminum.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The resonant waveguide structure of this invention has a small overall volume, simple structure, low production cost, and can withstand a large peak power and continuous wave power, which can well meet the needs of high-power loads in large scientific fields and microwave heating fields. When the first and second ceramic tubes are heated, there is a large temperature difference between them and the waveguide wall, which will cause the ceramic tubes to crack due to thermal stress. By adding a polytetrafluoroethylene gasket, it can not only avoid absorbing microwave radio frequency energy, but also buffer the ceramic and metal, thus avoiding the cracking of the ceramic tubes. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a high-power load based on a resonant waveguide structure.

[0020] Figure 2 This is an enlarged view of point A in a high-power load of a resonant waveguide structure.

[0021] Figure 3 This is a cross-sectional view of a high-power load in a resonant waveguide structure.

[0022] Figure 4 This is a partial cross-sectional view of a resonant waveguide structure in a high-power load.

[0023] The figure shows: rectangular waveguide port 1, rectangular waveguide 2, waveguide short-circuit plate 3, first washer 4, second washer 5, first ceramic tube 6, second ceramic tube 7, first water body 8, second water body 9, first metal cylinder 10, second metal cylinder 11, and metal block 12. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figures 1-4 In this embodiment of the invention, a resonant waveguide structure high-power load includes a rectangular waveguide 2, characterized in that: a rectangular waveguide port 1 is provided at one end of the rectangular waveguide 2, a waveguide short-circuit plate 3 is provided at the other end of the rectangular waveguide 2, the waveguide short-circuit plate 3 is welded to the other end of the rectangular waveguide 2, a first ceramic tube 6 and a second ceramic tube 7 are symmetrically arranged on the inner side of the rectangular waveguide 2, a first washer 4 is fixedly sleeved on the outer side of both ends of the first ceramic tube 6, a second washer 5 is fixedly sleeved on the outer side of both ends of the second ceramic tube 7, and a corresponding mounting through hole is opened transversely on both sides of the rectangular waveguide 2 for installing the first washer 4 and the second washer 5, respectively fixedly installed in the corresponding mounting through hole, a first water body 8 is provided on the inner side of the first ceramic tube 6, a second water body 9 is provided on the inner side of the second ceramic tube 7, a metal block 12 is welded to the bottom of the inner side of the rectangular waveguide 2, and a first metal cylinder 10 and a second metal cylinder 11 are symmetrically arranged on the inner side of the rectangular waveguide 2.

[0026] The top and bottom ends of the first metal cylinder 10 and the second metal cylinder 11 are fixedly connected to the top and bottom of the rectangular waveguide 2 by bolts; the rectangular waveguide port 1 is used for microwave power input; the first ceramic tube 6 and the second ceramic tube 7 are both made of materials with certain mechanical strength and wave transmission performance; the first ceramic tube 6 and the second ceramic tube 7 are both made of alumina ceramic, which has good pressure resistance and impact resistance; the first ceramic tube 6 and the second ceramic tube 7 are both thin cylinders, which have good pressure resistance, specifically a circular tube structure that can withstand a pressure of 12 bar; the first ceramic tube 6 and the second ceramic tube 7 are both connected to external water circulation pipes.

[0027] The rectangular waveguide 2, the first metal cylinder 10, the second metal cylinder 11, and the metal block 12 are all made of 6061 aluminum, and the length of the rectangular waveguide 2 is 500 mm; the first gasket 4 and the second gasket 5 are both made of polytetrafluoroethylene.

[0028] High-power loads are crucial components in microwave RF systems. A high VSWR can lead to increased reflected power and damage to power devices. Since accelerator power sources or microwave heating power sources have high continuous wave power, the load must be able to withstand high continuous wave power. Accelerator power sources can output power at the MW level, requiring the load to withstand high peak power. To meet specific operating bandwidth requirements, this resonant waveguide high-power load must satisfy certain operating bandwidth requirements. Furthermore, the VSWR of the load is also a critical indicator, as it directly determines the magnitude of reflection. A lower VSWR within the operating bandwidth is better; a high VSWR can damage the core components of the power source. This resonant waveguide high-power load, through optimized design, achieves a VSWR of less than 1.1 within the operating bandwidth, enabling it to withstand high peak and continuous wave power.

[0029] The working principle of this invention is:

[0030] In this invention, the resonant waveguide structure high-power load is a load made using the microwave absorption characteristics of water. Water is both an absorbing medium and a cooling medium, and its absorption efficiency is the highest among various loads. High-power microwaves output from a power source are input into a rectangular waveguide 2. The microwave power enters the short-circuited rectangular waveguide 2 from the rectangular waveguide port 1. By constructing a special microwave resonant structure, the resonant characteristics of water are utilized to absorb all the microwave power in the first ceramic tube 6 and the second ceramic tube 7. The water, heated by the microwave absorption, is then circulated through a high-speed, high-flow-rate water path. High peak power does not cause arcing, and it can withstand high temperatures without ceramic tube breakage under high continuous wave power conditions. Both the first ceramic tube 6 and the second ceramic tube 7 are thin... The cylindrical shape provides excellent pressure resistance, allowing it to withstand 12 bar of pressure. The overall pressure resistance is high. The tubular structure allows water to flow within the tube, resulting in a small water volume and a uniform internal electric field distribution, ensuring high resistance to electric field breakdown and high overall peak power and average power. The rapid water flow within the tube leads to high heat absorption and transfer efficiency. However, the significant temperature difference between the first and second ceramic tubes and the waveguide wall after heating can cause thermal stress and cracking of the ceramic tubes. By adding polytetrafluoroethylene gaskets (first gasket 4 and second gasket 5), the absorption of microwave radio frequency energy is prevented, and the ceramic and metal are buffered, thus avoiding cracking of the ceramic tubes (first ceramic tube 6 and second ceramic tube 7).

[0031] Although the present invention 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 invention should be included within the protection scope of the present invention.

Claims

1. A high-power load with a resonant waveguide structure, including a rectangular waveguide, characterized in that: One end of the rectangular waveguide is provided with a rectangular waveguide port, and the other end of the rectangular waveguide is provided with a waveguide short-circuit plate. The waveguide short-circuit plate is welded to the other end of the rectangular waveguide. A first ceramic tube and a second ceramic tube are symmetrically arranged on the inner side of the rectangular waveguide. A first gasket is fixedly sleeved on the outer side of both ends of the first ceramic tube, and a second gasket is fixedly sleeved on the outer side of both ends of the second ceramic tube. A first water body is provided on the inner side of the first ceramic tube, and a second water body is provided on the inner side of the second ceramic tube. The rectangular waveguide has horizontally penetrating through holes on both sides, with corresponding mounting holes for installing the first washer and the second washer. The first washer and the second washer are respectively fixedly installed in the corresponding mounting holes. A metal block is welded to the bottom inner side of the rectangular waveguide. A first metal cylinder and a second metal cylinder are symmetrically arranged on the inner side of the rectangular waveguide. The top and bottom ends of the first metal cylinder and the second metal cylinder are fixedly connected to the top and bottom of the rectangular waveguide by bolts. Both the first ceramic tube and the second ceramic tube are made of alumina ceramic material, which has mechanical strength and wave transmission properties, and both are thin cylindrical in shape; The first and second washers are both made of polytetrafluoroethylene, and the rectangular waveguide, the first metal cylinder, the second metal cylinder and the metal block are all made of aluminum.

2. The high-power load with resonant waveguide structure according to claim 1, characterized in that, The first ceramic tube and the second ceramic tube possess mechanical strength and wave transmission performance, and the high-speed flowing first water body and the second water body simultaneously serve as microwave absorbing medium and cooling medium.

3. The high-power load with resonant waveguide structure according to claim 1, characterized in that, The first and second gaskets, made of polytetrafluoroethylene, do not absorb microwave radio frequency energy and buffer the thermal stress between the alumina ceramic tube and the 6061 aluminum rectangular waveguide, thus preventing the ceramic tube from cracking due to heat.

4. The high-power load with resonant waveguide structure according to claim 1, characterized in that: The first and second washers do not absorb microwave radio frequency energy and can buffer the stress between the first and second ceramic tubes and the rectangular waveguide, preventing the first and second ceramic tubes from cracking due to heat. The load can withstand high peak power and continuous wave power, and the voltage standing wave ratio is less than 1.1 within the operating bandwidth.

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