CN114914136A - Travelling wave tube body collector assembling structure, travelling wave tube and assembling method - Google Patents
Travelling wave tube body collector assembling structure, travelling wave tube and assembling method Download PDFInfo
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- CN114914136A CN114914136A CN202210372142.5A CN202210372142A CN114914136A CN 114914136 A CN114914136 A CN 114914136A CN 202210372142 A CN202210372142 A CN 202210372142A CN 114914136 A CN114914136 A CN 114914136A
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- collector
- wave tube
- tube body
- output end
- transition ring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/02—Electrodes; Magnetic control means; Screens
- H01J23/027—Collectors
- H01J23/0275—Multistage collectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
- H01J25/34—Travelling-wave tubes; Tubes in which a travelling wave is simulated at spaced gaps
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Abstract
The invention provides a travelling wave tube body collector assembling structure, a travelling wave tube and an assembling method. The method comprises the following steps: the travelling wave tube body comprises an output end cover; the collector component comprises an inner collector, a collector ceramic cylinder, an outer collector and a transition ring; and at least one shim disposed between the output end cap and the transition ring. The invention utilizes a series of gaskets with known thickness to supplement the difference between the actual distance and the designed distance, and can obtain the traveling wave tube with the collector and the tube body accurately assembled. The collector obtained by precisely controlling the distance between the collector and the tube by the method according to the present invention is significantly improved in terms of collector recovery efficiency.
Description
Technical Field
The invention relates to the field of microwave vacuum electronic devices, in particular to a collector assembling structure of a tube body of a traveling wave tube, the traveling wave tube and an assembling method.
Background
The space traveling wave tube mainly comprises an electron gun (including a cathode assembly), a high-frequency system and a collector. The fundamental principle of the traveling wave tube is to convert electron beam energy into microwave energy through a high-frequency slow wave system. The basic working principle is that electrons emitted from a cathode are accelerated in an electron gun to form an electron beam, the electron beam is emitted into a high-frequency slow wave system, the electron beam is maintained to be a thin electron beam by a periodic magnetic focusing system, the thin electron beam penetrates through a spiral line, the electron energy is converted into microwave energy, and therefore signals are amplified. The amplified microwave signal enters the antenna transmitting system through the energy transmission coupling system. The electron beam with given partial energy enters the multistage depressed collector and is decelerated before reaching the collecting electrode, so that partial energy is recovered, and the rest electron energy bombards the collector and is converted into heat energy.
The collector is an important composition structure of the traveling wave tube and mainly comprises an outer collector, a collector ceramic cylinder and an inner collector. Improving the electron efficiency of the collector is an important means for improving the efficiency of the traveling wave tube. For a high-power traveling wave tube, the high-efficiency collector can not only improve the whole tube efficiency, but also effectively reduce the heat consumption of the collector, and is very important for improving the reliability of the traveling wave tube. The position of the electron beam entering the collector entrance, especially the positions of the traveling-wave tube output cavity and the first inner collector electrode, has a direct influence on the efficiency of the collector. The conventional assembly process ensures the center of the axle of each inner collector to be centered and the inter-electrode distance of the inner collector through the assembly precision of an assembly die or the self precision of parts. However, after brazing, the inner collector of the collector, particularly the position of the inner collector, deviates from the design value, thereby affecting the efficiency of the collector and the whole tube efficiency of the traveling wave tube. And due to the problems of consistency of parts and welding processes and the like, the axial sizes of all electrodes welded on the collector are different. This difference will result in improper positions of the electron injection port and the collector inlet, which affects the whole tube efficiency, collector heat consumption and whole tube reliability of the high-power traveling wave tube. Therefore, in order to ensure the efficiency of the whole tube, a method for accurately assembling the collector needs to be found, and particularly a method for accurately assembling the output cavity of the traveling wave tube and the collector needs to be found.
Disclosure of Invention
In view of the foregoing problems, a first technical problem to be solved by the present invention is to provide an assembling structure of a collector of a tube body of a traveling wave tube, so as to improve the recycling efficiency of the collector.
A second technical problem to be solved by the present invention is to provide a traveling-wave tube including the collector assembly structure as described above.
The third technical problem to be solved by the invention is to provide an assembly method of a collector of a traveling wave tube. Thereby improving the accuracy of the output cavity of the traveling wave tube and the collector and improving the recovery efficiency of the collector.
In order to solve the first technical problem, the invention adopts the following technical scheme:
a traveling wave tube body collector assembling structure, comprising:
the travelling wave tube body comprises an output end cover;
the collector component comprises an inner collector, a collector ceramic cylinder, an outer collector and a transition ring; and at least one shim disposed between the output end cap and the transition ring.
Preferably, the material of the spacer is the same as the material of the output end cap or the material of the transition ring.
Preferably, the edge of the output end cover is formed with a concave table structure.
Preferably, the gasket is selected from a plurality of gasket groups with different thicknesses, and the thickness of the gasket of each gasket group is selected from 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5 mm.
Preferably, the thickness of the shim is selected from 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5 mm.
In order to solve the second technical problem, the invention adopts the following technical scheme:
a traveling wave tube comprises the traveling wave tube body collector assembling structure.
In order to solve the third technical problem, the invention adopts the following technical scheme:
a traveling wave tube collector assembly method comprising a traveling wave tube as described above, the method comprising:
the depth of the concave table structure of the output end cover is increased by reducing the edge of the output end cover of the tube body by a preset thickness;
measuring the distance between an inner collector electron injection opening in the collector assembly and the transition ring;
assembling the tube body of the traveling wave tube and the collector,
and a gasket is added between the tube body output end cover and the collector transition ring, so that the distance between the inner collector electron injection port and the tube body electron injection port meets the design requirement.
Preferably, the method for obtaining the predetermined thickness comprises:
a plurality of collector electrode assemblies are assembled and brazed,
measuring the distance between the electron injection port of the inner collector in each collector assembly and the transition ring,
and calculating the difference between each measured distance and the designed size of the electron injection port of the inner collector in the collector assembly from the transition ring, and taking the maximum value in the calculated difference as the preset thickness.
Preferably, the method further comprises welding the assembled travelling wave tube body, the gasket and the collector together by argon arc welding.
Preferably, the gasket is selected from a plurality of gasket groups with different thicknesses, and the thickness of the gasket of each gasket group is selected from 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5 mm.
The invention has the following beneficial effects:
according to the invention, the depth of the concave platform structure matched with the output end cover of the tube body and the collector transition ring is increased from the design height to the sum of the design height and the predicted maximum matching error, so that the distance between the collector electron injection port and the tube body electron injection port can be accurately adjusted by increasing the thickness of the gasket during the whole tube assembly. The distance between the electron injection port of the collector in the brazed collector assembly and the surface of the transition ring is actually measured, and the difference between the actual distance and the design distance is supplemented by a series of gaskets with known thicknesses, so that the traveling wave tube with the accurately assembled collector and tube body can be obtained. The collector obtained by precisely controlling the distance between the collector and the tube by the method according to the invention is significantly improved in terms of collector recovery efficiency.
Drawings
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings:
fig. 1a and 1b are schematic diagrams illustrating a prior art assembly structure of a travelling wave tube body and a collector.
Fig. 2a and 2b show a flow chart for preparing a collector assembly structure of a tube body of a traveling wave tube according to the invention.
Fig. 3a shows a schematic structural diagram of the tube output end cap of the present invention.
Fig. 3b shows an enlarged schematic view of section a of fig. 3 a.
Fig. 4a shows a schematic view of an assembly structure of a collector of a tube body of a traveling wave tube according to an embodiment of the invention.
Fig. 4b shows an enlarged schematic view of section i of fig. 4 a.
Fig. 5a is a schematic view illustrating an assembly structure of a collector of a tube body of a traveling wave tube according to another embodiment of the invention.
Fig. 5b shows an enlarged schematic view of section ii of fig. 5 a.
FIG. 6 shows a simulation graph of the recovery efficiency design value of the collector structure provided by the present invention.
Fig. 7 shows a simulation graph of the recovery efficiency of the collector structure provided in example 1 of the present invention.
Fig. 8 shows a simulation of the recovery efficiency of the collector structure provided by example 2 of the present invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
Fig. 1a and 1b are schematic diagrams illustrating a prior art assembly structure of a travelling wave tube body and a collector. As shown, the assembly structure 100 includes a traveling wave tube body 110 and a collector assembly 120. The collector assembly 120 includes, for example, a first inner collector 121, a collector ceramic cylinder 122, an outer collector 123, and a collector transition ring 124, wherein the collector ceramic cylinder 122 is fixed between the first inner collector 121 and the outer collector 123, and the traveling-wave tube body 110 is welded together at the output cavity side by an output end cap 111.
As shown in fig. 1a and 1b, the collector assembly includes a first inner collector, and it can be understood by those skilled in the art that the collector assembly may include a plurality of inner collectors as needed, for example, the collector assembly further includes a second inner collector and a third inner collector in addition to the first inner collector, so as to form a multi-stage depressed collector structure, which is not limited by the present invention. The output end cap and the collector component are provided with coaxially arranged central holes for electron beams to travel from the high-frequency slow-wave structure to the collector.
The output end cap has a recessed platform 112 on the collector side that is recessed toward the collector, the depth D and diameter of the recessed platform matching the thickness h and inner diameter of the collector transition ring, respectively. For the conventional traveling-wave tube shown in fig. 1a and 1b, the design size of the end of the first inner collector facing the tube from the electron injection port of the tube is controlled by controlling the distance L1 from the collector transition ring by the die when assembling the collector assembly. And after the collector assembly is obtained by brazing, controlling the axial assembly size of the output end cover and the transition ring and welding to realize the fixation of the pipe body and the collector assembly. The traveling wave tube obtained in the mode is analyzed, and the distance between the first inner collecting pole and the surface of the transition ring in the collecting pole assembly has an error compared with the design size due to factors such as tolerance size of parts, addition amount of welding materials and different welding material dispersion degrees of a brazing process. Taking a certain frequency band space traveling wave tube as an example, the deviation of + -0.5 mm exists in the position of the collector component, which affects the recovery efficiency of the collector of 1-2%, as shown in the comparative example of fig. 5.
To solve the above problems, embodiments of the present invention provide a structure and a method for precisely controlling the critical dimension of a collector. Firstly, the method comprises the following steps:
in step S1, an error in the fitting size of the collector pole assembly is predicted.
According to a conventional configuration, a number of collector assembly test pieces 120, e.g., 3-5, are pre-assembled and brazed, as shown in FIGS. 2a and 2 b. The measured distance L1' from the collector transition ring surface was measured at the end of the first inner collector toward the tube side of each test piece. And comparing the measured distance L1 'with the design distance L1 between the first inner collector and the collector transition ring, and calculating the predicted assembly error delta-L1' -L1 of each collector assembly to obtain a predicted error set [ delta 1, delta 2], wherein delta 1 is the minimum predicted error value, and delta 2 is the maximum predicted error value.
And step S2, increasing the depth of the concave table structure of the output end cover of the pipe body according to the predicted assembly error.
Fig. 3a shows a schematic diagram of the tube output end cap 111, and fig. 3b shows an enlarged schematic diagram of a portion a in fig. 3 a. The end cap has a dimple structure 112 on the side facing the collector assembly. The end cover of the concave platform structure is matched with the transition ring of the collector component to weld the pipe body and the collector component together. It will be appreciated that the end cap may also be configured to match the configuration of the transition ring, be designed to have a boss configuration on the side facing the collector assembly, or have a planar configuration. The invention is not limited in this regard. The following description will be made by taking an end cap of a depressed center structure as an example with reference to the accompanying drawings.
The original design pocket depth of the tube output end cap pocket 112 is D. And (3) according to the predicted assembly error obtained in the step (1), the depth of the concave table structure matched with the collector assembly transition ring is adjusted to be D + delta 2 by reducing the thickness of the edge of the end cover, namely increasing the depth of the concave table. Described another way, the depth of the recessed step is increased to the sum of the design dimension D and the maximum predicted assembly error δ 2 by thinning the thickness of the end cap edge without changing the overall thickness of the end cap.
Step S3, assembling and brazing the collector assembly. And measuring the distance between the electron injection inlet of the first inner collector in the collector assembly and the transition ring of the collector to determine the compensation height.
The collector assembly is assembled with a mold and brazed to yield a brazed collector assembly 120. And for each collector assembly, measuring the distance L1 'from the electron injection port end of the first inner collector towards one side of the tube body to the surface of the collector transition ring in the collector assembly, and calculating the measured error delta between the measured distance L1' and the design size L1. And determining the transition ring compensation height of the collector assembly transition ring according to the predicted error delta 2 and the measured error delta.
And step S4, assembling the tube body, the output end cover and the collector assembly, and arranging a gasket between the output end cover and the collector transition ring to enable the distance between the tube body electron injection outlet and the collector electron injection inlet to meet the design requirement.
And assembling the pipe body, the output end cover and the collector assembly by using a mold. A shim having a thickness δ 2- δ is disposed over the collector transition ring. The material of the gasket can be the same as that of the transition ring or the end cover, and the inner diameter and the outer diameter of the gasket are arranged corresponding to the inner diameter and the outer diameter of the transition ring. The gaskets are a plurality of groups of gaskets with the thickness of 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm and 0.5mm respectively, so that the combination of the gaskets with different thicknesses can meet the requirement of compensation height.
And step S4, welding the assembled structure to obtain the pipe collector assembling structure with accurately controlled size.
Fig. 4a shows a tube collector assembly structure 400 according to example 1 of the present invention, and in conjunction with fig. 4b, the tube collector assembly structure 400 includes a traveling wave tube 410, a collector assembly 420, and a plurality of spacers 430 disposed between the tube and the collector assembly. The collector assembly 220 includes a first inner collector 421, a collector porcelain cylinder 422, an outer collector 423, and a collector transition ring 424. The tube body of the traveling wave tube comprises an output end cover 411 which is provided with a concave platform or a convex platform structure matched with the transition ring of the collector component, and a through hole for electron beam to advance is formed in the center of the output end cover. The gaskets are arranged between the edge of the output end cover (namely the bottom surface of the concave platform structure) and the transition ring, and the thickness of the gaskets enables the distance from the end part of one side, facing the tube body, of the first collector to the electron injection port of the tube body to meet the design requirement.
Example 1
The tube collector assembly structure according to example 1 is shown in fig. 4 a. In this example 1, the output end cap 411 dimple design has an original dimple depth D of 0.5mm and a justification dimension δ 2 of 0.15 mm; the measured distance L1 'from the transition ring to the first inner collector was 1.45mm, the design distance L1 was 1.55mm, δ was 0.1mm (L1' -L1), spacers having a thickness δ 2- δ were provided above the collector transition ring, the spacer thickness was 0.15- (-0.1) 0.25mm, a combination of 1 spacer having a thickness of 0.05mm and 2 spacers having a thickness of 0.1mm, and the assembly error and the design size were 0. The collector recovery efficiency of the collector assembly structure obtained in this example was 74.10%, as shown with reference to fig. 6 and 7.
Example 2
The tube collector assembly structure according to example 1 is shown in fig. 4 a. In example 2, with reference to fig. 5a and 5b, the original dimple depth D of the dimple structural design of the output end cap 411 is 0.5mm, and the adjustment dimension δ 2 is 0.15 mm; the measured distance L1 'from the first inner collector to the transition ring is 1.6mm, the design distance L1 is 1.55mm, δ is (L1' -L1) is 0.05mm, a gasket with the thickness δ 2- δ is arranged above the collector transition ring, the gasket thickness is 0.15+0.05 mm, 0.1mm is used, 1 gasket with the thickness of 0.1mm is used, and the assembly error and the design size are 0. The collector recovery efficiency of the collector assembly structure obtained in this example was 74.10%, as shown in fig. 6 and 8.
Comparative example 1
A tube collector assembly according to example 1 is shown. In comparative example 1, the output end cap pocket design had an original pocket depth D of 0.5mm and the measured distance L1 of the first inner collector in the collector assembly from the transition ring was 1.45 mm. The collector recovery efficiency of the collector assembly structure obtained in comparative example 1 was 72.96%.
Comparative example 2
A tube collector assembly according to example 2 is shown. In comparative example 2, the output end cap pocket design had an original pocket depth D of 0.5 and the measured distance L1 of the first inner collector in the collector assembly from the transition ring was 1.6. The collector recovery efficiency of the collector assembly structure obtained in comparative example 1 was 73.37%.
According to the method, the depth of the concave platform structure for matching the output end cover of the tube body and the collector transition ring is increased from the design height to the sum of the design height and the predicted maximum matching error, so that the distance between the collector electron injection port and the tube body electron injection port can be accurately adjusted by increasing the thickness of the gasket during the whole tube assembly. The distance between the electron injection port of the collector in the brazed collector assembly and the surface of the transition ring is actually measured, and the difference between the actual distance and the design distance is supplemented by a series of gaskets with known thicknesses, so that the traveling wave tube with the accurately assembled collector and tube body can be obtained. As shown in fig. 6 to 8 in combination, according to examples 1 and 2 of the present invention, the recovery efficiency was designed to be 74.10%. The recovery efficiencies of comparative example 1 and comparative example 2 were 72.96% and 73.37%, respectively, with an error between 1.14 and 0.73 percentage points. It can be seen that the collector recovery efficiency of examples 1 and 2 is significantly improved by precisely controlling the distance between the collector and the tube by the method according to the present invention, with exactly the same design parameters.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (10)
1. A traveling wave tube body collector assembling structure is characterized by comprising:
the travelling wave tube body comprises an output end cover;
the collector component comprises an inner collector, a collector ceramic cylinder, an outer collector and a transition ring; and at least one shim disposed between the output end cap and the transition ring.
2. The traveling wave tube body collector assembly structure of claim 1, wherein the gasket is made of the same material as the output end cap material or the transition ring material.
3. The traveling wave tube body collector assembly structure of claim 1, wherein the output end cap edge is formed with a recessed mesa structure.
4. The traveling wave tube body collector assembly structure according to claim 1, wherein the spacers are selected from a plurality of spacer groups with different thicknesses, and the thickness of each spacer group is selected from 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5 mm.
5. The traveling wave tube body collector assembly structure of claim 1, wherein the spacer thickness is selected from 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, or 0.5 mm.
6. A traveling wave tube comprising the traveling wave tube body collector assembly structure of claim 1.
7. A method of assembling a traveling-wave tube collector, the traveling-wave tube according to claim 6, the method comprising:
the depth of the concave table structure of the output end cover is increased by reducing the edge of the output end cover of the tube body by a preset thickness;
measuring the distance between an inner collector electron injection opening in the collector assembly and the transition ring;
assembling the tube body of the traveling wave tube and the collector,
and a gasket is added between the tube body output end cover and the collector transition ring, so that the distance between the inner collector electron injection port and the tube body electron injection port meets the design requirement.
8. The assembly method of claim 7, wherein the method of obtaining the predetermined thickness comprises:
a plurality of collector electrode assemblies are assembled and brazed,
measuring the distance between the electron injection port of the inner collector in each collector assembly and the transition ring,
and calculating the difference between each measured distance and the designed size of the electron injection port of the inner collector in the collector assembly from the transition ring, and taking the maximum value in the calculated difference as the preset thickness.
9. The method of assembling of claim 7 further including welding the assembled travelling wave tube body, gasket and collector together by argon arc welding.
10. The method of assembling of claim 7, wherein said shims are selected from a plurality of shim packs of varying thickness, each shim pack having a shim thickness selected from 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, or 0.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210372142.5A CN114914136A (en) | 2022-04-11 | 2022-04-11 | Travelling wave tube body collector assembling structure, travelling wave tube and assembling method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210372142.5A CN114914136A (en) | 2022-04-11 | 2022-04-11 | Travelling wave tube body collector assembling structure, travelling wave tube and assembling method |
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| Publication Number | Publication Date |
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| CN114914136A true CN114914136A (en) | 2022-08-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210372142.5A Pending CN114914136A (en) | 2022-04-11 | 2022-04-11 | Travelling wave tube body collector assembling structure, travelling wave tube and assembling method |
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| CN (1) | CN114914136A (en) |
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- 2022-04-11 CN CN202210372142.5A patent/CN114914136A/en active Pending
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