A cut-off load structure applicable to C-band coupled cavity traveling wave tube

Abstract

The present invention provides a cut-off load structure applicable to a C-band coupled cavity traveling wave tube, and relates to the field of cross-shaped high-power traveling wave tube cut-off load. The cut-off load structure applicable to a C-band coupled cavity traveling wave tube comprises a cut-off load assembly and a mold assembly, wherein both sides of the upper side of the porcelain column cavity plate assembly are welded with cavity rings through solder wires; the porcelain column cavity plate assembly comprises a cavity plate body, a porcelain column assembly, and a fixing ring, and a plurality of porcelain column assemblies are welded to the upper part of the cavity plate body through a fixing ring; the porcelain column assembly comprises a cylindrical porcelain column, a solder sheet, and a transition ring, and a solder sheet is arranged on the outer periphery of the lower part of the cylindrical porcelain column, and a transition ring is arranged at the lower part of the cylindrical porcelain column. By assembling the cut-off load assembly to the appropriate position in the traveling wave tube slow wave circuit, it is well matched with the input and output ends of the traveling wave tube, suppresses self-excited oscillation and band edge oscillation, and realizes the working stability and excellent electrical performance of the traveling wave tube.

Description

Technical Field

[0001] The invention relates to the field of cross-shaped high-power traveling wave tube cut-off loads, in particular to a cut-off load structure that can be applied to a C-band coupled cavity traveling wave tube. Background Art

[0002] High frequency and high power are important development directions of traveling wave tubes, which are widely used in various radars, aerospace and national defense fields. The coupled cavity slow-wave circuit structure is the first choice for C-band high-power traveling wave tubes, but the stability problem is one of the most difficult problems in the design and trial production of C-band high-power coupled cavity traveling wave tubes. Traditional small and medium-power helical traveling wave tubes often use a clamping rod carbon vapor structure as a cut-off load; traveling wave tubes with slightly larger output power use a coupled cavity structure and use a traditional wedge-shaped attenuation porcelain structure or bowl-shaped porcelain as a cut-off load, and the power level is improved to a certain extent compared with helical traveling wave tubes. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a load-cut structure that can be applied to a C-band coupled cavity traveling wave tube, which solves the problems of low pulse output power and average output power of the traveling wave tube and insufficient working stability of the traveling wave tube.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a cut-off load structure applicable to a C-band coupled cavity traveling wave tube, comprising a cut-off load component and a mold component, characterized in that: a mold component is arranged on the periphery of the cut-off load component;

[0005] The load-cutting assembly comprises a porcelain column cavity plate assembly, a solder wire and a cavity ring, and both sides of the upper side of the porcelain column cavity plate assembly are welded with cavity rings through solder wires;

[0006] The porcelain column cavity plate assembly comprises a cavity plate body, a porcelain column assembly, and a fixing ring, and a plurality of porcelain column assemblies are welded to the upper part of the cavity plate body through the fixing ring;

[0007] The ceramic column assembly comprises a cylindrical ceramic column, a solder sheet, and a transition ring. The solder sheet is arranged on the outer periphery of the lower part of the cylindrical ceramic column, and the transition ring is arranged on the lower part of the cylindrical ceramic column.

[0008] Preferably, the mold assembly includes a fixing rod, an upper clamping plate, and a lower clamping plate, and a plurality of evenly distributed fixing rods are arranged on the upper side of the lower clamping plate, and the upper sides of the fixing rods all penetrate the upper clamping plate, and the upper ends of the fixing rods are all threadedly connected with nuts.

[0009] Preferably, the porcelain column assembly, the porcelain column cavity plate assembly, and the cut-off load assembly are all arranged between the upper clamping plate and the lower clamping plate.

[0010] A manufacturing process for a cut-off load structure applicable to a C-band coupled cavity traveling wave tube comprises the following steps:

[0011] S1: Assembling and welding ceramic column components (4)

[0012] First, the solder sheet (2), the cylindrical ceramic column (1), the transition ring (3) and other parts are assembled using a mold assembly (12), and then the assembled parts are sent to a hydrogen burning process for welding. Specifically, the welding mold temperature is raised from room temperature to 690-710°C for 20-30 minutes, and then the welding mold temperature is raised from 690-710°C to 770-790°C for 10-15 minutes;

[0013] S2. Assemble and weld the ceramic column cavity plate assembly (6)

[0014] First, the ceramic column assembly (4), the solder sheet (2), the fixing ring (15), the cavity plate body (5) and other parts are assembled using a mold assembly (12), and then the assembled parts are sent to a hydrogen burning process, specifically, the welding mold temperature is increased from 770-790°C to 840-880°C for 20-30 minutes, and then maintained at 840-880°C for 5-10 minutes;

[0015] S3. Assembling and welding the load-cutting components (14)

[0016] First, the components of the porcelain column cavity plate assembly (6) and the cavity ring (8) are assembled using a mold, and then an appropriate amount of silver-copper solder wire (7) is tied to the mating surface of the porcelain column cavity plate assembly (6) and the cavity ring (8). Finally, the assembled components are sent to a hydrogen burning process, specifically, the welding mold temperature is cooled from 840 to 880°C to 770 to 790°C for 20 minutes, and then the welding mold temperature is cooled from 770 to 790°C to 690 to 710°C for 10 minutes, and then the welding mold temperature is cooled from 690 to 710°C to below 100°C for 30 minutes;

[0017] S4. Leak detection: Use a leak detector to detect the leak rate of the welded cut-off load assembly.

[0018] The present invention provides a load-cutting structure applicable to a C-band coupled cavity traveling wave tube, which has the following beneficial effects:

[0019] 1. The present invention is assembled in a slow-wave circuit and matched with the input and output circuits. It plays a role of concentrated attenuation in the slow-wave circuit, effectively suppressing the self-excited oscillation in the band and the band edge oscillation of the C-band high-power coupled cavity, preventing the increase of tube current caused by oscillation, the reduction of interaction efficiency, sparking, degassing leading to reduced vacuum and cathode poisoning, and other faults, so that the traveling wave tube can work stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the porcelain column assembly of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the cavity plate assembly of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the load cutting component of the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the clamp assembly of the present invention;

[0024] Figure 5 It is a structural schematic diagram of the porcelain column assembly and the corresponding fixture assembly of the present invention;

[0025] Figure 6 It is a schematic structural diagram of the cavity plate assembly and the corresponding fixture assembly of the present invention;

[0026] Figure 7 It is a schematic diagram of the cutting load assembly and the corresponding clamp assembly mechanism of the present invention.

[0027] Among them, 1. Cylindrical ceramic column; 2. Solder sheet; 3. Transition ring; 4. Ceramic column assembly; 5. Cavity plate body; 6. Ceramic column cavity plate assembly; 7. Solder wire; 8. Cavity ring; 9. Fixing rod; 10. Upper clamping plate; 11. Nut; 12. Mold assembly; 13. Lower clamping plate; 14. Cut-off load assembly; 15. Fixing ring. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiment is only one embodiment of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] Example:

[0030] like Figure 1-7 As shown, an embodiment of the present invention provides a cut-off load structure that can be applied to a C-band coupled cavity traveling wave tube, including a cut-off load component 14 and a mold component 12, wherein the mold component 12 is arranged on the periphery of the cut-off load component 14; a cylindrical ceramic column 1 is made of a composite material of silicon carbide and aluminum nitride.

[0031] The cut-off load assembly 14 includes a porcelain column cavity plate assembly 6, a solder wire 7 and a cavity ring 8. The cavity ring 8 is welded to both sides of the upper side of the porcelain column cavity plate assembly 6 through the solder wire 7. The cut-off load assembly 14 is installed in a C-band high-power coupled cavity traveling wave tube.

[0032] The porcelain column cavity plate assembly 6 comprises a cavity plate body 5, a porcelain column assembly 4, and a fixing ring 15. A plurality of porcelain column assemblies 4 are welded to the upper part of the cavity plate body 5 through the fixing ring 15.

[0033] The ceramic column assembly 4 includes a cylindrical ceramic column 1, a solder sheet 2, and a transition ring 3. The solder sheet 2 is arranged on the outer periphery of the lower part of the cylindrical ceramic column 1, and the transition ring 3 is arranged on the lower part of the cylindrical ceramic column 1. In summary, the whole tube is assembled with the cut-off load assembly 14, and in the C-band coupled cavity traveling wave tube test, the output pulse power is 100 kilowatts, the average output power is 5 kilowatts, and the traveling wave tube can work stably without oscillation, sparking and other abnormal conditions. The experiment proves that the structural design of the cut-off load can effectively suppress the in-band and band-edge oscillation of the C-band coupled cavity traveling wave tube, and the structural design of the cut-off load can be promoted and applied to other band coupled cavity traveling wave tube products.

[0034] The mold assembly 12 includes a fixing rod 9, an upper clamping plate 10, and a lower clamping plate 13. A plurality of evenly distributed fixing rods 9 are arranged on the upper side of the lower clamping plate 13. The upper sides of the fixing rods 9 all pass through the upper clamping plate 10. The upper ends of the fixing rods 9 are threadedly connected with nuts 11. The mold assembly 12 is a universal structure and can clamp and fix the ceramic column assembly 4, the ceramic column cavity plate assembly 6, and the cutting load assembly 14.

[0035] The ceramic column assembly 4, the ceramic column cavity plate assembly 6, and the cut-off load assembly 14 are all arranged between the upper clamping plate 10 and the lower clamping plate 13. The ceramic column assembly 4, the ceramic column cavity plate assembly 6, and the cut-off load assembly 14 are fixed by the upper clamping plate 10 and the lower clamping plate 13 to facilitate processing.

[0036] A manufacturing process for a cut-off load structure applicable to a C-band coupled cavity traveling wave tube comprises the following steps:

[0037] S1: Assemble and weld the ceramic column assembly 4

[0038] First, the solder sheet 2, the cylindrical porcelain column 1, the transition ring 3 and other parts are assembled by the mold assembly 12, and then the assembled parts are sent to the hydrogen burning process for welding, specifically, the welding mold temperature is raised from room temperature to 690~710℃ for 30min, and then the welding mold temperature is raised from 690~710℃ to 770~790℃ for 10min;

[0039] S2. Assemble and weld the ceramic column cavity plate assembly 6

[0040] First, the ceramic column assembly 4, the solder sheet 2, the fixing ring 15, the cavity plate body 5 and other parts are assembled with the mold assembly 12, and then the assembled parts are sent to the hydrogen burning process, specifically, the welding mold temperature is increased from 770~790℃ to 840~880℃ for 20 minutes, and then maintained at 840~880℃ for 5 minutes;

[0041] S3. Assemble, weld and cut off load components 14

[0042] First, the porcelain column cavity plate assembly 6 and the cavity ring 8 parts are assembled with a mold, and then a proper amount of silver-copper solder wire 7 is tied to the fitting surface of the porcelain column cavity plate assembly 6 and the cavity ring 8. Finally, the assembled parts are sent to the hydrogen burning process. Specifically, the time is 20 minutes, the welding mold temperature is cooled from 840~880℃ to 770~790℃, and then 10 minutes, the welding mold temperature is cooled from 770~790℃ to 690~710℃, and then 30 minutes, the welding mold temperature is cooled from 690~710℃ to below 100℃;

[0043] S4. Leak detection: Use a leak detector to detect the leak rate of the welded cut-off load assembly 14. In summary, the surfaces of the cylindrical porcelain column 1, transition ring 3, fixing ring 15, cavity ring 8, cavity plate body 5 and other parts are clean, without obvious deformation, dirt and other defects; the mold surface is clean and without obvious deformation; during the welding process of each component, the heating and cooling speed of the components cannot be faster than 20℃ / Min; during the leak detection of the cut-off load assembly 14, the vacuum leakage rate of the component is better than 1×10-10Pa.L / S; all components must be kept in a drying cabinet or vacuum bottle during storage; the components must be assembled in a clean room; the cut-off load assembly 14 after water circulation must be cold tested in conjunction with the input and output circuit sections to check the matching of the cut-off load in the slow-wave circuit.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cut-off load structure applicable to a C-band coupled cavity traveling wave tube, comprising a cut-off load component (14) and a mold component (12), characterized in that: A mold assembly (12) is arranged on the outer periphery of the cutting load assembly (14); The cut-off load assembly (14) comprises a porcelain column cavity plate assembly (6), a solder wire (7) and a cavity ring (8), wherein the cavity ring (8) is welded to both sides of the upper side of the porcelain column cavity plate assembly (6) via the solder wire (7); The porcelain column cavity plate assembly (6) comprises a cavity plate body (5), a porcelain column assembly (4), and a fixing ring (15); a plurality of porcelain column assemblies (4) are welded to the upper part of the cavity plate body (5) via the fixing ring (15); The ceramic column assembly (4) comprises a cylindrical ceramic column (1), a solder sheet (2), and a transition ring (3); the solder sheet (2) is arranged on the outer periphery of the lower part of the cylindrical ceramic column (1), and the transition ring (3) is arranged on the lower part of the cylindrical ceramic column (1); The mold assembly (12) comprises a fixing rod (9), an upper clamping plate (10), and a lower clamping plate (13); a plurality of evenly distributed fixing rods (9) are arranged on the upper side of the lower clamping plate (13); the upper sides of the fixing rods (9) all penetrate the upper clamping plate (10); and the upper ends of the fixing rods (9) are all threadedly connected with nuts (11); The porcelain column assembly (4), the porcelain column cavity plate assembly (6), and the cut-off load assembly (14) are all arranged between the upper clamping plate (10) and the lower clamping plate (13).

2. A manufacturing process for a cut-off load structure applicable to a C-band coupled cavity traveling wave tube, using the cut-off load structure applicable to a C-band coupled cavity traveling wave tube as claimed in claim 1, characterized in that: The following steps are involved: S1: Assembling and welding ceramic column components (4) First, the solder sheet (2), the cylindrical ceramic column (1), and the transition ring (3) are assembled using a mold assembly (12), and then the assembled parts are sent to a hydrogen burning process for welding, specifically, the welding mold temperature is raised from room temperature to 690-710°C for 20-30 minutes, and then the welding mold temperature is raised from 690-710°C to 770-790°C for 10-15 minutes; S2. Assemble and weld the ceramic column cavity plate assembly (6) First, the ceramic column assembly (4), the solder sheet (2), the fixing ring (15), the cavity plate body (5) and other parts are assembled using a mold assembly (12), and then the assembled parts are sent to a hydrogen burning process, specifically, the welding mold temperature is increased from 770-790°C to 840-880°C for 20-30 minutes, and then maintained at 840-880°C for 5-10 minutes; S3. Assembling and welding the load-cutting components (14) First, the components of the porcelain column cavity plate assembly (6) and the cavity ring (8) are assembled using a mold, and then an appropriate amount of silver-copper solder wire (7) is tied to the mating surface of the porcelain column cavity plate assembly (6) and the cavity ring (8). Finally, the assembled components are sent to a hydrogen burning process, specifically, the welding mold temperature is cooled from 840 to 880°C to 770 to 790°C for 20 minutes, and then the welding mold temperature is cooled from 770 to 790°C to 690 to 710°C for 10 minutes, and then the welding mold temperature is cooled from 690 to 710°C to below 100°C for 30 minutes; S4. Leak detection: Use a leak detector to detect the leak rate of the welded cut-off load assembly (14).

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