Tool for sealing travelling wave tube cathode supporting assembly

Abstract

The invention discloses a tool for sealing a cathode supporting assembly of a traveling wave tube, relates to the technical field of traveling wave tube assembly, and is mainly used for solving the defects of the existing tool for sealing. According to the main structure, the device comprises a base, the upper surface of the base is connected with an emitter installation boss, the outer side of the emitter installation boss is sleeved with a positioning sleeve, and the inner wall of the positioning sleeve is provided with a positioning step; a pressing cap is arranged above the positioning sleeve, an emitter pressing block is arranged below the pressing cap, a supporting seat pressing block is arranged on the upper surface of the pressing cap, and a supporting frame pressing block is arranged on the upper surface of the supporting seat pressing block. According to the tool for sealing the traveling wave tube cathode supporting assembly, all parts of the cathode supporting assembly can be effectively fixed in the brazing process through the tool, and displacement of all the parts is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of traveling wave tube assembly, in particular to a tool for sealing a traveling wave tube cathode support assembly. Background Art

[0002] A traveling wave tube is an electric vacuum power device used for microwave signal amplification and power conversion. It is widely used in communications, radar, satellites, remote sensing, electronic countermeasures and other fields. In a traveling wave tube, the cathode is one of its core components, and the performance of the cathode directly affects the efficiency and service life of the traveling wave tube. During operation, the cathode needs to withstand extreme conditions such as high temperature, high vacuum and high electric field strength. The main function of the cathode support assembly is to provide stable mechanical support for the cathode, ensuring that the cathode maintains a precise position during the electron emission process, while also playing the role of electrical insulation and providing a high vacuum environment for the cathode to work.

[0003] At present, the cathode support assembly has the characteristics of small size, light weight and thin wall. Its specific structure is as follows Figure 1 As shown, it is usually formed by sealing the cathode emitter, cathode support seat and cathode support frame through brazing process. The cathode support seat is sleeved on the outside of the cathode emitter; and the cathode support frame is arranged between the cathode emitter and the cathode support seat, and is respectively connected to the cathode emitter and the cathode support seat by brazing.

[0004] However, the existing sealing tooling structure has the following problems: first, the parts cannot be effectively fixed during the brazing process, which makes the parts easily displaced; second, the bonding after brazing is difficult to remove, which increases the maintenance cost and operation difficulty of the tooling. These problems make the cathode support assembly after brazing prone to parts deformation, cold welding, poor positioning tolerance, etc., resulting in unstable performance of the cathode support assembly, and thus unable to meet the requirements of high precision and high reliability.

[0005] Therefore, a new cathode support assembly sealing tool is needed to ensure the brazing quality of the cathode support assembly. Summary of the invention

[0006] The object of the present invention is to provide a tool for sealing a cathode support assembly of a traveling wave tube, which can effectively fix various parts of the cathode support assembly during brazing to avoid displacement of the parts.

[0007] The technical solution of the present invention to solve the above technical problems is: a tool for sealing a cathode support assembly of a traveling wave tube, comprising a horizontally arranged base, the upper surface of which is connected to an emitter mounting boss, a coaxial sleeve outside the emitter mounting boss is provided with a positioning sleeve that is clearance-matched with the emitter mounting boss, and a positioning step for positioning and installing a cathode support seat and a cathode support frame is provided on the inner wall of the positioning sleeve;

[0008] A pressure cap is coaxially provided above the positioning sleeve, and an emitter pressure block is provided below the pressure cap and is in close contact with the upper end surface of the cathode emitter. A support seat pressure block is provided on the upper surface of the pressure cap, passing through the pressure cap downward and in close contact with the upper end surface of the cathode support seat. A support frame pressure block is provided on the upper surface of the support seat pressure block, passing through the support seat pressure block and the pressure cap in sequence downward and in close contact with the upper end surface of the cathode support frame.

[0009] As a further improvement of the present invention, a positioning sleeve mounting boss is fixedly provided on the upper surface of the base, and the positioning sleeve is sleeved on the outside of the positioning sleeve mounting boss; the emitter mounting boss is arranged at the axis center of the upper end of the positioning sleeve mounting boss.

[0010] As a further improvement of the present invention, the positioning sleeve is a graphite sleeve, and a molybdenum sleeve is sleeved on the outside of the graphite sleeve.

[0011] As a further improvement of the present invention, a mounting opening is vertically penetrated through the axis of the support seat pressure block, and two arc-shaped pressure blocks a are vertically provided on the lower surface of the support seat pressure block and are arranged along the outer edges of both sides of the mounting opening respectively, and the lower end of the arc-shaped pressure block a passes downward through the pressure cap and is in tight contact with the upper end surface of the cathode support seat.

[0012] As a further improvement of the present invention, the lower surface of the support frame pressing block is provided with a positioning boss which is inserted into the mounting opening, and two arc-shaped pressing blocks b are vertically provided on the lower end surface of the positioning boss and are arranged along the inner edges of both sides of the mounting opening respectively, and the lower end of the arc-shaped pressing block b passes downward through the pressure cap and is in tight contact with the upper end surface of the cathode support frame.

[0013] As a further improvement of the present invention, the pressing cap is provided with an arc-shaped notch for the arc-shaped pressing block a and the arc-shaped pressing block b to pass through.

[0014] As a further improvement of the present invention, an annular counterweight portion is provided on the upper outer wall of the support seat pressing block and the support frame pressing block.

[0015] As a further improvement of the present invention, the upper surface of the emitter mounting boss is provided with an emitter lower positioning hole for positioning and mounting the cathode emitter.

[0016] As a further improvement of the present invention, the pressure cap is provided with an emitter positioning hole for positioning and installing the cathode emitter.

[0017] As a further improvement of the present invention, a positioning through hole is vertically provided on the emitter pressing block.

[0018] Beneficial Effects

[0019] Compared with the prior art, the advantages of the tooling for sealing the cathode support assembly of a traveling wave tube of the present invention are:

[0020] 1. In the tooling, the cathode emitter is positioned and installed by the emitter mounting boss and the emitter pressing block, the cathode support seat is positioned and installed by the positioning sleeve and the support seat pressing block, and the cathode support frame is positioned and installed by the positioning sleeve and the support frame pressing block; thus, the tooling can effectively fix the various parts of the cathode support assembly during the brazing process to avoid displacement of the various parts, thereby avoiding deformation of parts, cold welding, poor positioning tolerance accuracy, etc. in the cathode support assembly after brazing, thereby making the performance of the cathode support assembly stable and meeting the requirements of high precision and high reliability.

[0021] 2. The positioning sleeve is made of a graphite sleeve and a molybdenum sleeve. Due to the low surface energy of the graphite material itself, it is difficult for the brazing material to infiltrate the graphite surface and cannot adhere to it, thus solving the problem of the solder sticking to the tooling. At the same time, it is stronger than using a graphite sleeve alone, making the positioning sleeve more durable as a whole. In addition, since the thermal expansion coefficients of graphite and molybdenum are close to those of ceramics, the difference in expansion at high temperatures is small, which can play a role in high-precision positioning.

[0022] The present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, which are used to illustrate embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 is a cross-sectional view of a cathode support assembly;

[0025] Figure 2 is a cross-sectional view of the present invention;

[0026] Figure 3 A top view of the pressure cap of the present invention;

[0027] Figure 4 A top view of the support seat pressing block of the present invention;

[0028] Figure 5 A top view of the support frame pressing block of the present invention;

[0029] Figure 6 It is a schematic diagram of the cooperation between the present invention and the cathode support assembly.

[0030] Among them: 1-base; 11-positioning sleeve mounting boss; 12-emitter mounting boss; 121-emitter lower positioning hole; 2-graphite sleeve; 21-positioning step; 3-molybdenum sleeve; 4-pressure cap; 41-arc-shaped notch; 42-emitter upper positioning hole; 5-support seat pressure block; 51-mounting opening; 52-arc-shaped pressure block a; 6-support frame pressure block; 61-positioning boss; 62-arc-shaped pressure block b; 7-emitter pressure block; 71-positioning through hole. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the 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.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; of course, it can also be a mechanical connection or an electrical connection; in addition, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0034] Example:

[0035] The specific embodiments of the present invention are as follows Figure 2-6 As shown, a tool for sealing a cathode support assembly of a traveling wave tube includes a horizontally arranged base 1, and an emitter mounting boss 12 is connected to the upper surface of the base 1. At the same time, a positioning sleeve is provided on the outer side of the emitter mounting boss 12. The positioning sleeve is coaxially arranged with the emitter mounting boss 12, and there is a certain gap between the positioning sleeve and the emitter mounting boss 12, which is a clearance fit. In addition, a positioning step 21 for positioning and installing the cathode support seat and the cathode support frame is also provided on the inner wall of the positioning sleeve - wherein the vertical surface of the positioning step 21 is arranged in positioning contact with the outer wall surface of the cathode support seat; the horizontal surface of the positioning step 21 is arranged in contact with the lower end surface of the cathode support seat and the outer edge lower end surface of the cathode support frame. With such a design, the entire lower part of the cathode support assembly can be stably placed on the emitter mounting boss 12 and the positioning step 21, thereby avoiding horizontal shaking and downward displacement.

[0036] In order to further fix the various components of the cathode support assembly, the tooling is also coaxially provided with a pressure cap 4 above the positioning sleeve, and an emitter pressing block 7 that is in close contact with the upper end face of the cathode emitter is provided below the pressure cap 4. In this embodiment, the outer edge of the pressure cap 4 extends downward and is sleeved with the outer wall of the positioning sleeve. The upper surface of the pressure cap 4 is provided with a support seat pressing block 5 that passes downward through the pressure cap 4 and is in close contact with the upper end face of the cathode support seat. The upper surface of the support seat pressing block 5 is provided with a support frame pressing block 6 that passes downward through the support seat pressing block 5 and the pressure cap 4 in sequence and is in close contact with the upper end face of the cathode support frame. As a result, the emitter pressing block 7 can prevent the cathode emitter from moving upward, the support seat pressing block 5 can prevent the cathode support seat from moving upward, and the support frame pressing block 6 can prevent the cathode support frame from moving upward.

[0037] Since the tool can position and install the cathode emitter through the emitter installation boss 12 and the emitter pressing block 7; position and install the cathode support seat through the positioning sleeve and the support seat pressing block 5; and position and install the cathode support frame through the positioning sleeve and the support frame pressing block 6. Therefore, the tool can effectively fix the various parts of the cathode support assembly during the brazing process to prevent the displacement of the various parts, thereby avoiding the occurrence of part deformation, cold welding, poor positioning tolerance accuracy, etc. in the cathode support assembly after brazing, thereby making the performance of the cathode support assembly stable and meeting the requirements of high precision and high reliability.

[0038] In order to position and install the positioning sleeve on the base 1, the tooling has a positioning sleeve mounting boss 11 fixed on the upper surface of the base 1, and the positioning sleeve is sleeved on the outside of the positioning sleeve mounting boss 11. Correspondingly, the emitter mounting boss 12 is arranged at the axis of the upper end of the positioning sleeve mounting boss 11. Such an arrangement can keep the position between the positioning sleeve and the emitter mounting boss 12 relatively fixed, so that the entire lower part of the cathode support assembly is stably placed, avoiding displacement of various parts, and thus ensuring product quality.

[0039] In this embodiment, the positioning sleeve is a graphite sleeve 2, and a molybdenum sleeve 3 is sleeved on the outside of the graphite sleeve 2. The positioning sleeve is used in combination with the graphite sleeve 2 and the molybdenum sleeve 3. Among them, due to the low surface energy of the graphite material itself, it is difficult for the brazing material to infiltrate the graphite surface and cannot adhere, so the problem of the brazing material sticking to the tooling can be solved; at the same time, it is also stronger than using the graphite sleeve 2 alone, so that the positioning sleeve as a whole is more durable; in addition, since the thermal expansion coefficients of graphite and molybdenum are close to ceramics, and the main material of the cathode support frame is insulating ceramics, the difference in expansion at high temperature is small, which can play a role in high-precision positioning.

[0040] In this tooling, in order to achieve the compression of the upper end surface of the cathode support seat and the upper end surface of the cathode support frame, a mounting opening 51 is vertically penetrated by the axis of the support seat pressing block 5, and two arc-shaped pressing blocks a52 are vertically arranged along the outer edges of both sides of the mounting opening 51 on the lower surface of the support seat pressing block 5. The lower end of the arc-shaped pressing block a52 passes downward through the pressing cap 4 and is in tight contact with the upper end surface of the cathode support seat. At the same time, a positioning boss 61 is provided on the lower surface of the support frame pressing block 6, which is positioned and inserted in the mounting opening 51, and two arc-shaped pressing blocks b62 are vertically arranged along the inner edges of both sides of the mounting opening 51 on the lower end surface of the positioning boss 61, and the lower end of the arc-shaped pressing block b62 passes downward through the pressing cap 4 and is in tight contact with the upper end surface of the cathode support frame.

[0041] In this embodiment, the pressure cap 4 is provided with an arc-shaped notch 41 for the arc-shaped pressure block a52 and the arc-shaped pressure block b62 to pass through. The arc-shaped notch 41 is designed to guide the insertion path of the arc-shaped pressure block a52 and the arc-shaped pressure block b62, so that the upper end surface of the cathode support seat and the upper end surface of the cathode support frame are pressed down and fixed. At the same time, in order to further ensure the stability of the cathode support seat and the cathode support frame during the brazing process, an annular counterweight portion is provided on the upper outer wall of the support seat pressure block 5 and the support frame pressure block 6. The effect of gravity is used to prevent the cathode support seat and the cathode support frame from shaking and displacement.

[0042] In addition, in order to realize the positioning and installation of the cathode emitter on the emitter mounting boss 12, the tool is provided with an emitter lower positioning hole 121 for positioning and installing the cathode emitter on the upper surface of the emitter mounting boss 12. In this embodiment, in order to avoid the emission rod at the upper end of the cathode emitter, an emitter upper positioning hole 42 for positioning and installing the cathode emitter is provided on the pressure cap 4. At the same time, a positioning through hole 71 is vertically provided on the emitter pressing block 7.

[0043] The present invention has been described above in conjunction with the best embodiments, but the present invention is not limited to the embodiments disclosed above, but should cover various modifications and equivalent combinations based on the essence of the present invention.

Claims

1. A tool for sealing a cathode support assembly of a traveling wave tube, characterized in that: The invention comprises a horizontally arranged base (1), wherein the upper surface of the base (1) is connected to an emitter mounting boss (12), a positioning sleeve which is coaxially sleeved outside the emitter mounting boss (12) and is clearance-matched therewith is provided, and a positioning step (21) for positioning and mounting a cathode support seat and a cathode support frame is provided on the inner wall of the positioning sleeve; A pressure cap (4) is coaxially arranged above the positioning sleeve, and an emitter pressure block (7) is arranged below the pressure cap (4) and is in close contact with the upper end surface of the cathode emitter. A support seat pressure block (5) is arranged on the upper surface of the pressure cap (4) and passes through the pressure cap (4) downwards and is in close contact with the upper end surface of the cathode support seat. A support frame pressure block (6) is arranged on the upper surface of the support seat pressure block (5) and the pressure cap (4) in sequence and passes through the support seat pressure block (5) and the pressure cap (4) downwards and is in close contact with the upper end surface of the cathode support frame.

2. The tooling for sealing the cathode support assembly of a traveling wave tube according to claim 1, characterized in that: A positioning sleeve mounting boss (11) is fixedly provided on the upper surface of the base (1), and the positioning sleeve is sleeved on the outside of the positioning sleeve mounting boss (11); the emitter mounting boss (12) is arranged at the axis center of the upper end of the positioning sleeve mounting boss (11).

3. The tooling for sealing the cathode support assembly of a traveling wave tube according to claim 1 or 2, characterized in that: The positioning sleeve is a graphite sleeve (2), and a molybdenum sleeve (3) is sleeved on the outside of the graphite sleeve (2).

4. The tooling for sealing the cathode support assembly of a traveling wave tube according to claim 1, characterized in that: The support seat pressure block (5) is provided with a mounting opening (51) vertically passing through the axis thereof, and two arc-shaped pressure blocks a (52) are vertically provided on the lower surface of the support seat pressure block (5) and are arranged along the outer edges of both sides of the mounting opening (51), respectively, and the lower end of the arc-shaped pressure block a (52) passes downward through the pressure cap (4) and is in tight contact with the upper end surface of the cathode support seat.

5. The tooling for sealing the cathode support assembly of a traveling wave tube according to claim 4, characterized in that: The lower surface of the support frame pressing block (6) is provided with a positioning boss (61) which is inserted into the mounting opening (51), and two arc-shaped pressing blocks b (62) are vertically provided on the lower end surface of the positioning boss (61) and are arranged along the inner edges of both sides of the mounting opening (51), respectively. The lower end of the arc-shaped pressing block b (62) passes downward through the pressing cap (4) and is in tight contact with the upper end surface of the cathode support frame.

6. The tooling for sealing the cathode support assembly of a traveling wave tube according to claim 5, characterized in that: The pressing cap (4) is provided with an arc-shaped notch (41) for the arc-shaped pressing block a (52) and the arc-shaped pressing block b (62) to pass through.

7. The tooling for sealing the cathode support assembly of a traveling wave tube according to claim 5 or 6, characterized in that: An annular counterweight portion is provided on the upper outer wall of the support seat pressing block (5) and the support frame pressing block (6).

8. The tooling for sealing the cathode support assembly of a traveling wave tube according to claim 1, characterized in that: The upper surface of the emitter mounting boss (12) is provided with an emitter lower positioning hole (121) for positioning and mounting the cathode emitter.

9. The tooling for sealing the cathode support assembly of a traveling wave tube according to claim 1 or 8, characterized in that: The pressure cap (4) is provided with an emitter upper positioning hole (42) for positioning and installing the cathode emitter.

10. The tooling for sealing the cathode support assembly of a traveling wave tube according to claim 9, characterized in that: The emitter pressing block (7) is vertically provided with a positioning through hole (71).

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