CN218770024U - High-power traveling wave structure all-metal dry-type load - Google Patents

Abstract

The utility model discloses a high-power traveling wave structure all-metal dry-type load, including two water jackets, two be mutual fixed connection between the water jacket, water jacket left side fixedly connected with waveguide, waveguide left side fixedly connected with flange, the water jacket outside edge is close to left side department and runs through jointly and is equipped with the oral siphon to rather than fixed connection, the water jacket outside edge is close to right side department and runs through jointly and is equipped with the outlet pipe to rather than fixed connection, the good port of the design requirement of high-power all-metal load matches, very little reveals, and the phenomenon of striking sparks does not take place for high-power during operation, can bear high temperature and do not take place deformation under the high continuous wave power condition, and high-power load is a device of very important among the microwave radio frequency system. When the standing load wave ratio is high, the reflected power is increased to damage the power device.

Description

High-power traveling wave structure all-metal dry-type load

Technical Field

The utility model relates to a metal processing technology field especially relates to a high-power traveling wave structure all-metal dry-type load.

Background

A C-band full-energy injector accelerating structure for a southern light source testing platform, which is designed by the high-energy physics research institute of Chinese academy of sciences, needs a high-power dummy load to absorb residual microwave energy, and whether the absorbed load can work stably and reliably can influence the service life and the working efficiency of an accelerator, and the reliable and stable dummy load is a key for ensuring the safe work of a core device.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, one of the purposes of the present invention is to provide an all-metal dry load with a high-power traveling wave structure.

The utility model discloses an one of the purpose adopts following technical scheme to realize:

the utility model provides a high-power traveling wave structure all-metal dry-type load, includes two water jackets, two be mutual fixed connection between the water jacket, water jacket left side fixedly connected with waveguide, waveguide left side fixedly connected with flange, the water jacket outside edge is close to left side department and runs through jointly and is equipped with the oral siphon to rather than fixed connection, the water jacket outside edge is close to right side department and runs through jointly and is equipped with the outlet pipe, rather than fixed connection.

Further, the right side of the water jacket is fixedly connected with an air exhaust waveguide, and the right side of the air exhaust waveguide is fixedly connected with a CF vacuum port.

Furthermore, a plurality of metal cylinders are fixedly connected to the positions, close to the right side, of the top and the bottom of the inner cavity of the water jacket, and narrow metal blocks are fixedly connected to the positions, close to the left side, of the top and the bottom of the inner cavity of the water jacket.

Further, the shape accuracy and flatness of the all-metal load is 0.01mm, the inner surface roughness Ra is less than 0.4 μm, and the length of the load is about 1000 mm.

Furthermore, the water jacket adopts a layered water cooling structure form, so that the production, the processing and the installation are convenient, the cooling effect is good, the low temperature rise of the outer surface of the all-metal load can be ensured, enough redundancy is reserved on the wide edge of the cylindrical section waveguide, and the phenomenon of sparking can not occur during the high-power work.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the design of the high-power all-metal load requires good port matching and very small leakage, the ignition phenomenon does not occur when the high power works, and the high-power all-metal load can bear high temperature without deformation under the condition of high continuous wave power;

high power loads are a very important component of microwave radio frequency systems. When the standing load wave ratio is high, the reflected power is increased to damage the power device. Since the operating frequency of the southern light source C-band full-energy injector accelerating structure has a certain bandwidth, the load is required to have wider bandwidth adaptability. The input power of the accelerating structure is about 90MW, most of power is used for electron acceleration, the residual power is about 30MW, and the full metal load is used for absorbing all the residual power, converting the residual power into heat energy and taking away the heat energy by cooling water. In order to meet the requirement of broadband operation, a high-power all-metal dry load needs to meet a certain bandwidth requirement. In addition, the voltage standing wave ratio of the load is also an important index, because the voltage standing wave ratio directly determines the reflection size of the load, the smaller the voltage standing wave ratio in the working bandwidth is, the better the voltage standing wave ratio is, and if the voltage standing wave ratio is large, the working state of the accelerator is influenced, so that the system is unstable. Through size selection, structure optimization design and the like of the all-metal dry load, the load can meet the index less than 1.1 in the working bandwidth, can work well in the range of 5 GHz-6 GHz, and almost has no reflection.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are specifically illustrated below, and the detailed description is given in conjunction with the accompanying drawings.

Drawings

FIG. 1 is a perspective view of the present embodiment;

FIG. 2 is a left side view of the component water jacket of the present embodiment;

FIG. 3 is a schematic view of the structure of a metal cylinder of the present embodiment;

fig. 4 is a schematic diagram of the structure of the narrow metal block of this embodiment.

In the figure: 1. a water jacket; 2. a water inlet pipe; 3. a WR187 waveguide; 4. a WR187 flange; 5. an air exhaust waveguide; 6. a CF vacuum port; 7. a metal cylinder; 8. a narrow metal block; 9. and (5) discharging a water pipe.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 4, an all-metal dry load with a high-power traveling wave structure comprises two water jackets 1, wherein the two water jackets 1 are fixedly connected with each other, the left side of the water jacket 1 is fixedly connected with a WR187 waveguide 3, the left side of the WR187 waveguide 3 is fixedly connected with a WR187 flange 4, the outer edges of the water jackets 1 close to the left side are jointly penetrated with a water inlet pipe 2 and fixedly connected with the water inlet pipe, the outer edges of the water jackets 1 close to the right side are jointly penetrated with a water outlet pipe 9 and fixedly connected with the water outlet pipe, the right side of the water jacket 1 is fixedly connected with an air exhaust waveguide 5, the right side of the air exhaust waveguide 5 is fixedly connected with a CF vacuum port 6, the top and the bottom of an inner cavity of the water jacket 1 close to the right side are fixedly connected with a plurality of metal cylinders 7, and the top and the bottom of the inner cavity of the water jacket 1 close to the left side are fixedly connected with narrow metal blocks 8;

the shape precision and the flatness of the all-metal load are required to be 0.01mm, the roughness Ra of the inner surface is lower than 0.4 mu m, the length of the load is about 1000 mm, the water jacket 1 adopts a layered water cooling structure form, the production, the processing and the installation are convenient, the cooling effect is good, the outer surface temperature rise of the all-metal load can be ensured not to be high, enough redundancy is left on the wide edge of the cylindrical section waveguide, and the phenomenon of ignition can not occur during the high-power work;

the SS430 all-metal dry absorption load is designed to withstand peak power >50MW, and average power >5kW. The design of the load is based on the classical approach of using a regular waveguide close to the cut-off frequency. To achieve the desired operating bandwidth (bandwidth of about 1 GHz) and reasonable load length, the center gap width of the load is made about half the waveguide width, which can increase the cut-off frequency of the load by about 20% over that of a standard rectangular waveguide of the same width. This approach has many benefits, one is to reduce the strength of the surface electric and magnetic fields by increasing the waveguide width, and two is to keep the load with sufficiently high rf losses. The load length is optimized to be 1m so as to meet the bandwidth requirement, and the longer the load is, the wider the bandwidth is. In order to meet continuous wave high power operation, a special wedge taper is designed to provide constant thermal load distribution for loads within a certain length range. The all-metal load is connected to a standard WR187 rectangular waveguide by a special taper that enables good matching over a wide frequency range, the matching part of the load being the highest temperature part. The temperature sensors are arranged linearly along the weld joint, and five temperature sensors are placed along the weld joint line loaded within the insulating jacket.

The working principle is as follows: the device can be used for replacing a real load to be used as index verification tests and power absorption of a microwave power source system, an antenna, an accelerator and the like. Dummy loads are important accessories for microwave systems, being fully matched loads connected to the terminals of the transmission line, absorbing all the power transmitted to the terminals along the transmission line without reflection. Common radio frequency loads can be divided into two types: a. a load that directly heats water; b. the water-cooled metal surface is provided with an absorbing material. Both types of loads face different problems, one of which is the direct absorption of rf energy by water to heat, which requires the use of fragile ceramic windows with ceramic layers attached by soldering, brazing, press fitting or gluing to a water-insulated cooling surface. Another is to use a wave-absorbing material (such as ferrite) to absorb the rf energy, which is subject to the problems of poor thermal expansion and uneven heat generation and transmission, resulting in breakage. Conventional rf power loads typically include dielectric and magnetic materials and sensitive ceramic windows that are not allowed to exceed 90 ℃. The temperature of the cooling water reaching the outlet at high power may exceed 150 c, so that it is difficult for conventional loads to be able to operate at such severe temperatures. The all-metal radio frequency high-power load does not need ceramic to be used as isolation cooling water, does not need wave-absorbing materials, and can work at a high temperature of more than 150 ℃ and a vacuum degree of less than 10-9Pa without deformation;

SS430 stainless steel is used as the load, and SS304 nonmagnetic stainless steel is used as the water jacket 1. Microwave power is input from a port of the WR187 rectangular waveguide, matching of a load end and the WR187 rectangular waveguide is achieved through the tapered part, and finally the power is absorbed by surface resistance formed by a cylinder. In order to enhance the peak power bearing capacity of the load, the full-metal load works in a high-vacuum environment, a CF35 exhaust flange is designed to be connected with an ion pump for vacuumizing, and an exhaust waveguide is arranged between the exhaust waveguide 5 and the load to ensure the high-vacuum environment in the load body. The microwave energy absorbed by the load body is finally converted into heat, so a water cooling jacket needs to be designed to carry the heat away by using cooling water. The water jacket adopts a parallel heat radiation design, cooling water is introduced through a water pipe and is divided into two paths before entering the water jacket 1, and the two paths of cooling water are respectively fed into the two parallel water jackets. Cooling water enters the parallel water jacket at one section to take heat away, and is finally led out through the tail end of the water jacket, and is combined into one path for output after being led out. This makes both the cooling of the load more uniform and the water path simpler. The WR187 rectangular waveguide needs to be tapered excessively to convert to a rectangular waveguide of the load body to satisfy a good match. The tapered part adopts a groove-shaped structure, consists of a plurality of bent metal bodies with arc tops, and is in a step-shaped structural form, so that two waveguides with different impedances are matched. The metal body is formed as an arc tip to prevent sparking at high peak power conditions. The load absorption structure is realized by an array formed by a plurality of cylinders, the cylinders are arranged on the wide sides of the rectangular waveguides and are symmetrically distributed, and the distance between the cylinders on the wide sides of the two rectangular waveguides meets the requirement of the working bandwidth. The benefit of the cylindrical array structure is that the load has good absorption properties.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims (5)

1. The utility model provides a high-power travelling wave structure all-metal dry-type load, includes two water jackets (1), its characterized in that: two be mutual fixed connection between water jacket (1), water jacket (1) left side fixedly connected with waveguide (3), waveguide (3) left side fixedly connected with flange (4), water jacket (1) outside edge is close to the common water inlet pipe (2) that runs through of left side department to rather than fixed connection, water jacket (1) outside edge is close to the common water outlet pipe (9) that runs through of right side department, and rather than fixed connection.

2. The all-metal dry load with the high-power traveling wave structure as claimed in claim 1, wherein: the right side of the water jacket (1) is fixedly connected with an air exhaust waveguide (5), and the right side of the air exhaust waveguide (5) is fixedly connected with a CF vacuum port (6).

3. The all-metal dry load with the high-power traveling wave structure as claimed in claim 1, wherein: the water jacket (1) inner chamber top and bottom are close to equal fixedly connected with a plurality of metal cylinder (7) of right side department, water jacket (1) inner chamber top and bottom are close to equal fixedly connected with narrow metal block (8) of left side department.

4. The all-metal dry load with the high-power traveling wave structure as claimed in claim 1, wherein: the shape accuracy and flatness requirements of the all-metal load are 0.01mm, the internal surface roughness Ra is lower than 0.4 μm, and the length of the load is about 1000 mm.

5. The all-metal dry load with the high-power traveling wave structure as claimed in claim 1, wherein: the water jacket (1) adopts a layered water cooling structure form.

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