High power traveling wave structure all-metal dry load

Abstract

The application provides a high-power traveling wave structure full-metal dry load, and belongs to the technical field of dry loads.The high-power traveling wave structure full-metal dry load comprises a rectangular flange, one side of the rectangular flange is fixedly connected with a small rectangular waveguide, microwave power is input from a WR187 rectangular waveguide port, a taper part is used to realize matching between a load end and the WR187 rectangular waveguide, 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 pumping flange is designed to be connected with an ion pump to pump vacuum, a pumping waveguide is arranged between the pumping waveguide 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 and is taken away by cooling water, so that the load can work at high temperature and under a vacuum degree of less than 10-9 Pa, and deformation does not occur.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of dry load, and particularly relates to a large-power full-metal dry load of a traveling wave structure. BACKGROUND

[0002] A C-band full-energy injector accelerating structure designed by the Institute of High Energy Physics of the Chinese Academy of Sciences for a test platform of the South Light Source needs a large-power dummy load to absorb residual microwave energy. Whether the absorbing load can work stably and reliably will affect the service life and working efficiency of the accelerator, and a reliable and stable dummy load is the key to ensure the safe work of the core device.

[0003] The dummy load is an important accessory equipment of the microwave system, is a full-matching load connected at the terminal of the transmission line, and absorbs all the power transmitted along the transmission line to the terminal without reflection. The commonly used radio frequency load can be divided into two types: a. a load directly heating water; and b. a water-cooled metal surface mounted absorbing material. The two types of loads all face different problems. One directly uses water to absorb radio frequency energy into heat, and needs to use a fragile ceramic window, which is installed to the cooling surface of the water isolation through brazing, copper brazing, press fitting or gluing. The other uses an absorbing material (such as ferrite) to absorb radio frequency energy, and the absorbing material faces the problems of thermal expansion difference and uneven heat generation and transmission, which will cause breakage. The traditional radio frequency power load usually contains dielectric and magnetic materials and sensitive ceramic windows, which are not allowed to exceed 90 DEG C. In the case of high power, the temperature of the cooling water reaching the outlet may exceed 150 DEG C, so the traditional load is difficult to work under such harsh conditions.

[0004] Therefore, a dry load capable of working without deformation under a high temperature of 150 DEG C or above and a vacuum degree of less than 10-9 Pa is needed to replace the real load as an index verification test, power absorption use of a microwave power source system, an antenna and an accelerator. SUMMARY

[0005] The application aims to provide a large-power full-metal dry load of a traveling wave structure, and aims to solve the problem that the existing load in the prior art will deform under a high temperature of 150 DEG C or above and a vacuum degree of less than 10-9 Pa.

[0006] In order to achieve the above object, the present application provides the following technical scheme: a large-power full-metal dry load of traveling wave structure, comprising a rectangular flange, one side of the rectangular flange is fixedly connected with a small rectangular waveguide, one side of the small rectangular waveguide is fixedly connected with a taper section body, one side of the taper section body is fixedly connected with a large rectangular waveguide, one side of the large rectangular waveguide is fixedly connected with an air extraction waveguide, one side of the air extraction waveguide is fixedly connected with an air extraction flange, the inner wall of the large rectangular waveguide close to the taper section body is fixedly connected with a metal block, and the inner wall of the large rectangular waveguide close to the air extraction waveguide is fixedly connected with a cylindrical array.

[0007] In order to achieve the effect of constituting the metal block, as a preferred embodiment of the present application, the metal block is composed of a plurality of metal blocks, and the shape of the metal block is a stepped narrow rectangular body.

[0008] In order to achieve the effect of constituting the cylindrical array, as a preferred embodiment of the present application, the cylindrical array is composed of a plurality of metal cylinders.

[0009] In order to achieve the effect of welding the upper water jacket and the lower water jacket together, as a preferred embodiment of the present application, the front surface of the large rectangular waveguide is fixedly connected with an upper water jacket, the back surface of the large rectangular waveguide is fixedly connected with a lower water jacket, and a welding seam is arranged between the upper water jacket and the lower water jacket.

[0010] In order to achieve the effect that the inside of the upper water jacket and the lower water jacket can flow into cooling water, as a preferred embodiment of the present application, the inside of the upper water jacket is provided with an upper water channel, and the inside of the lower water jacket is provided with a lower water channel.

[0011] In order to achieve the effect of connecting the first water pipe and the second water pipe together, as a preferred embodiment of the present application, the front surface of the upper water jacket is fixedly connected with a first water pipe, the back surface of the lower water jacket is fixedly connected with a second water pipe, and the ends of the first water pipe and the second water pipe close to each other are fixedly connected with a three-way inlet water pipe.

[0012] In order to achieve the effect of facilitating the entry of cooling water, as a preferred embodiment of the present application, one end of the three-way inlet water pipe is fixedly connected with a water inlet pipe.

[0013] In order to make the large power traveling wave structure full metal dry load achieve the effect of connecting the third water pipe and the fourth water pipe together, as a preferred embodiment of the present application, the front surface of the upper water jacket is fixedly connected with the third water pipe, the back surface of the lower water jacket is fixedly connected with the fourth water pipe, and the ends of the third water pipe and the fourth water pipe close to each other are fixedly connected with the three-way outlet water pipe.

[0014] In order to make the large power traveling wave structure full metal dry load achieve the effect of facilitating the outflow of cooling water, as a preferred embodiment of the present application, one end of the three-way outlet water pipe is fixedly connected with the water outlet pipe.

[0015] Compared with the prior art, the present application has the beneficial effects that:

[0016] 1. The large power traveling wave structure full metal dry load, through the setting of the rectangular flange, the air extraction flange, the air extraction waveguide, the small rectangular waveguide, the taper section body, the metal block, the cylindrical array and the large rectangular waveguide, the microwave power is input from the WR187 rectangular waveguide port, matched with the WR187 rectangular waveguide through the taper part, and finally absorbed by the surface resistance formed by the cylinder, and in order to enhance the peak power bearing capacity of the load, the full metal load works in a high vacuum environment, a CF35 air extraction flange is designed to be connected with an ion pump to extract vacuum, an air extraction waveguide is installed between the air extraction waveguide and the load to ensure the high vacuum environment inside the load body, the microwave energy absorbed by the load body is finally converted into heat and taken away by the cooling water, the taper part of the WR187 rectangular waveguide converted into the load body is in a groove structure and composed of multiple curved arc top metal bodies, and the structure is in a stepped form to match the waveguides with two different impedances, and the arc top metal body is made to prevent sparking under high peak power, so that the load can work under high temperature and a vacuum degree of less than 10-9 Pa without deformation.

[0017] 2. The large power traveling wave structure full metal dry load, through the setting of the water inlet pipe, the water outlet pipe, the upper water jacket, the lower water jacket, the three-way outlet water pipe, the three-way inlet water pipe, the first water pipe, the second water pipe, the third water pipe and the fourth water pipe, the cooling water enters the three-way inlet water pipe through the water inlet pipe and is divided into two paths, one path flows into the upper water channel through the first water pipe, and the other path flows into the lower water channel through the second water pipe, and the cooling water passing through the upper water channel and the lower water channel flows into the three-way outlet water pipe through the third water pipe and the fourth water pipe respectively, and finally flows out of the water outlet pipe, so that the internal load can be cooled to take away heat, and the metal water jacket can also withstand a higher temperature. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application and are used to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0019] Figure 1 is a structural schematic diagram of the present application;

[0020] Figure 2 is a top view of the structural schematic diagram of the present application;

[0021] Figure 3 is a front view of the structural schematic diagram of the present application;

[0022] Figure 4 is a right view of the structural schematic diagram of the present application;

[0023] Figure 5 is a top view of the structural schematic diagram of the present application;

[0024] Figure 6 is a top view of the structural schematic diagram of the present application.

[0025] In the figure: 1, rectangular flange; 2, water inlet pipe; 3, water outlet pipe; 4, upper water jacket; 5, lower water jacket; 6, air extraction flange; 7, air extraction waveguide; 8, upper water channel; 9, small rectangular waveguide; 10, tapering section body; 11, metal block; 12, metal block; 13, cylindrical array; 14, large rectangular waveguide; 15, weld; 16, lower water channel; 17, three-way inlet water pipe; 18, three-way outlet water pipe; 19, first water pipe; 20, second water pipe; 21, third water pipe; 22, fourth water pipe; 23, metal cylinder. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0027] EMBODIMENT

[0028] Please refer to Figures 1-6 The present application provides the following technical solutions: a large-power traveling wave structure full-metal dry load, comprising a rectangular flange 1, one side of the rectangular flange 1 being fixedly connected with a small rectangular waveguide 9, one side of the small rectangular waveguide 9 being fixedly connected with a tapering section body 10, one side of the tapering section body 10 being fixedly connected with a large rectangular waveguide 14, one side of the large rectangular waveguide 14 being fixedly connected with an air extraction waveguide 7, one side of the air extraction waveguide 7 being fixedly connected with an air extraction flange 6, the inner wall of the large rectangular waveguide 14 close to the tapering section body 10 being fixedly connected with a metal block 11, and the inner wall of the large rectangular waveguide 14 close to the air extraction waveguide 7 being fixedly connected with a cylindrical array 13.

[0029] In the specific embodiment of the application, the rectangular flange 1, the pumping flange 6, the pumping waveguide 7, the small rectangular waveguide 9, the tapered section body 10, the metal block 11, the cylindrical array 13 and the large rectangular waveguide 14 are arranged, the material of the rectangular flange 1 is SS304L stainless steel, the rectangular flange 1 is welded with the small oxygen-free copper waveguide 9 as the microwave power input port, the small oxygen-free copper waveguide 9 is welded with the large SS430 stainless steel rectangular waveguide 14 as the load, the SS430 stainless steel pumping waveguide 7 is integrally processed with the large SS430 stainless steel rectangular waveguide 14, and the CF35 pumping flange 6 is welded at the rear end of the SS430 stainless steel pumping waveguide 7 to connect the ion pump for pumping vacuum, the load starts from the tapered section body 10, the tapered section body 10 is made of SS430 stainless steel with curvature and is welded at one end of the large SS430 stainless steel rectangular waveguide 14, the metal block 11 and the cylindrical array 13 are fixed inside the large rectangular waveguide 14, the microwave power is input from the waveguide port of the WR187 rectangular flange 1, the load end is matched with the WR187 rectangular flange 1 waveguide through the tapered section, the final power is absorbed by the surface resistance formed by the cylinder, and at the same time, in order to enhance the peak power bearing capacity of the load, the all-metal load works in a high vacuum environment, the CF35 pumping flange 6 is designed to be connected with the ion pump for pumping vacuum, a pumping waveguide 7 is installed between the pumping flange 6 and the load to ensure the high vacuum environment inside the load, the microwave energy absorbed by the load is finally converted into heat and taken away by the cooling water, the tapered section in the rectangular waveguide of the load converted from the WR187 rectangular flange 1 waveguide adopts a groove structure composed of multiple curved arc top metal bodies, the structure is in the form of a step, and the two waveguides with different impedances are matched, the arc top metal body is made to prevent sparking under high peak power, the absorption structure of the load adopts an array composed of multiple cylinders to realize, the cylinders are installed on the wide side inside the large rectangular waveguide 14 and are symmetrically distributed, the spacing between the cylinders on the wide sides of the two large rectangular waveguides 14 meets the working bandwidth requirement, and the structure of the cylindrical array 13 has the advantage that the load has good absorption performance, so that the load can work at high temperature and under a vacuum degree of less than 10-9 Pa without deformation.

[0030] Specifically, the metal block 11 is composed of a plurality of metal blocks 12, and the metal block 12 is in the form of a stepped narrow rectangular body.

[0031] In the embodiment, the metal block 12 is arranged to form the metal block 11.

[0032] Specifically, the cylindrical array 13 is composed of a plurality of metal cylinders 23.

[0033] In the embodiment, the metal cylinder 23 is arranged to form the cylindrical array 13.

[0034] Specifically, the front surface of the large rectangular waveguide 14 is fixedly connected with the upper water jacket 4, and the back surface of the large rectangular waveguide 14 is fixedly connected with the lower water jacket 5. The upper water jacket 4 and the lower water jacket 5 are provided with a welding seam 15 therebetween.

[0035] In this embodiment, the upper water jacket 4 and the lower water jacket 5 are welded together through the welding seam 15.

[0036] Specifically, the inside of the upper water jacket 4 is provided with an upper water channel 8, and the inside of the lower water jacket 5 is provided with a lower water channel 16.

[0037] In this embodiment, the inside of the upper water jacket 4 and the inside of the lower water jacket 5 can flow into cooling water through the upper water channel 8 and the lower water channel 16.

[0038] Specifically, the front surface of the upper water jacket 4 is fixedly connected with a first water pipe 19, the back surface of the lower water jacket 5 is fixedly connected with a second water pipe 20, and the ends of the first water pipe 19 and the second water pipe 20 close to each other are fixedly connected with a three-way inlet water pipe 17.

[0039] In this embodiment, the first water pipe 19 and the second water pipe 20 are connected together through the three-way inlet water pipe 17.

[0040] Specifically, one end of the three-way inlet water pipe 17 is fixedly connected with a water inlet pipe 2.

[0041] In this embodiment, the setting of the water inlet pipe 2 facilitates the entry of cooling water.

[0042] Specifically, the front surface of the upper water jacket 4 is fixedly connected with a third water pipe 21, the back surface of the lower water jacket 5 is fixedly connected with a fourth water pipe 22, and the ends of the third water pipe 21 and the fourth water pipe 22 close to each other are fixedly connected with a three-way outlet water pipe 18.

[0043] In this embodiment, the third water pipe 21 and the fourth water pipe 22 are connected together through the three-way outlet water pipe 18.

[0044] Specifically, one end of the three-way outlet water pipe 18 is fixedly connected with a water outlet pipe 3.

[0045] In this embodiment, the setting of the water outlet pipe 3 facilitates the outflow of cooling water.

[0046] The working principle and use process of the application are as follows: when the high-power full-metal dry load of the waveguide structure is used, microwave power is input from the WR187 rectangular flange 1 waveguide port, the load end is matched with the WR187 rectangular flange 1 waveguide through the tapering part, and finally the power is absorbed by the surface resistance formed by the 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 6 is designed to be connected with an ion pump to extract vacuum, an exhaust waveguide 7 is installed between the exhaust flange 6 and the load to ensure the high vacuum environment inside the load body, the microwave energy absorbed by the load body is finally converted into heat and taken away by the cooling water, the tapering part in the rectangular waveguide of the load body converted from the WR187 rectangular flange 1 waveguide adopts a groove structure composed of multiple curved arc top metal bodies, and the structure is in a stepped form, which matches the waveguides with two different impedances, the arc top metal body is made to prevent sparking under high peak power, the absorption structure of the load adopts an array composed of multiple cylinders, the cylinders are installed on the wide side of the large rectangular waveguide 14 and are symmetrically distributed, the spacing between the cylinders on the wide sides of the two large rectangular waveguides 14 meets the working bandwidth requirement, and the structure of the cylinder array 13 has the advantage of making the load have good absorption performance; the cooling water enters the three-way inlet water pipe 17 through the water inlet pipe 2 and is divided into two paths, one path flows into the upper water channel 8 through the first water pipe 19, and the other path flows into the lower water channel 16 through the second water pipe 20, the cooling water passing through the upper water channel 8 and the lower water channel 16 flows into the three-way outlet water pipe 18 through the third water pipe 21 and the fourth water pipe 22 respectively, and finally flows out through the water outlet pipe 3.

[0047] Finally, it should be noted that: the above only describes the preferred embodiments of the application and is not used to limit the application, although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement for part of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A high-power waveguide structure all-metal dry load, comprising a rectangular flange (1), characterized in that: one side of the rectangular flange (1) is fixedly connected with a small rectangular waveguide (9), one side of the small rectangular waveguide (9) is fixedly connected with a taper section body (10), the taper section body (10) adopts a groove structure and is composed of a plurality of curved arc top metal bodies, for matching waveguides with different impedances; one side of the taper section body (10) is fixedly connected with a large rectangular waveguide (14), the inner wall of the large rectangular waveguide (14) close to the taper section body (10) is fixedly connected with a metal block (11), the metal block (11) is composed of a plurality of metal blocks (12) with a stepped narrow-edge rectangular shape; the inner wall of the large rectangular waveguide (14) close to an exhaust waveguide (7) is fixedly connected with a cylindrical array (13), the cylindrical array (13) is composed of a plurality of metal cylinders (23) for absorbing microwave power; one side of the large rectangular waveguide (14) is fixedly connected with the exhaust waveguide (7), one side of the exhaust waveguide (7) is fixedly connected with an exhaust flange (6) for connecting an ion pump to exhaust vacuum and ensure a high-vacuum environment inside the load body; the front of the large rectangular waveguide (14) is fixedly connected with an upper water jacket (4), the back of the large rectangular waveguide (14) is fixedly connected with a lower water jacket (5), and a weld (15) is arranged between the upper water jacket (4) and the lower water jacket (5) for welding and fixing; the inside of the upper water jacket (4) is provided with an upper water channel (8), and the inside of the lower water jacket (5) is provided with a lower water channel (16) for circulation of cooling water; the front of the upper water jacket (4) is fixedly connected with a first water pipe (19) and a third water pipe (21), and the back of the lower water jacket (5) is fixedly connected with a second water pipe (20) and a fourth water pipe (22); the ends of the first water pipe (19) and the second water pipe (20) close to each other are fixedly connected with a three-way inlet water pipe (17), one end of the three-way inlet water pipe (17) is fixedly connected with an inlet water pipe (2) for inflow of cooling water; the ends of the third water pipe (21) and the fourth water pipe (22) close to each other are fixedly connected with a three-way outlet water pipe (168), one end of the three-way outlet water pipe (168) is fixedly connected with an outlet water pipe (3) for outflow of cooling water. The materials of the large rectangular waveguide (14), the small rectangular waveguide (9), the taper section body (10), and the exhaust waveguide (7) are stainless steel.

2. A full metal dry load of a high-power traveling wave structure according to claim 1, characterized in that: The cooling water flows in through the inlet water pipe (2), is distributed to the upper water channel (8) and the lower water channel (16) through the three-way inlet water pipe (17), is collected to the outlet water pipe (3) through the three-way outlet water pipe (168) after absorbing heat generated by the load, and flows out.

3. A full metal dry load of a high-power traveling wave structure according to claim 1, characterized in that: ​

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