Tool for sealing travelling wave tube cathode supporting assembly

Abstract

The utility model 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 conventional 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. The utility model provides a tool for sealing a traveling wave tube cathode support assembly, which can effectively fix each part of the cathode support assembly in the brazing process and avoid displacement of each part.

Description

TECHNICAL FIELD

[0001] The utility model relates to a traveling wave tube assembly technical field especially relates to a kind of traveling wave tube cathode support subassembly sealing with frock. BACKGROUND

[0002] Traveling wave tube is a kind of electric vacuum power device for microwave signal amplification and power conversion, which is widely used in communication, radar, satellite, remote sensing, electronic countermeasure and other fields.In traveling wave tube, cathode is one of its core components, and the performance of cathode directly affects the efficiency and service life of traveling wave tube.In the working process, cathode needs to withstand high temperature, high vacuum and high electric field intensity and other extreme conditions.The main role of cathode support subassembly is to provide stable mechanical support for cathode, ensure that cathode maintains accurate position during electron emission process, simultaneously plays the role of electrical insulation, and provides high vacuum environment for cathode work.

[0003] At present, cathode support subassembly has the characteristics of small size, light part quality and thin wall, and its specific structure is shown in Figure 1 , which is usually sealed by brazing process by cathode emitter, cathode support seat and cathode support frame.The cathode support seat is sleeved outside the cathode emitter, and the cathode support frame is arranged between the cathode emitter and the cathode support seat, and is connected with the cathode emitter and the cathode support seat by brazing.

[0004] However, the existing sealing frock structure has the following problems: first, the parts cannot be effectively fixed during brazing, which causes the parts to be easily displaced;second, the brazing is not easy to disassemble after bonding, which increases the maintenance cost and operation difficulty of frock.These problems make the brazed cathode support subassembly prone to part deformation, false welding, poor line position tolerance precision and other situations, thereby causing the performance of cathode support subassembly to be unstable, and further unable to meet the requirements of high precision and high reliability.

[0005] Therefore, a new cathode support subassembly sealing frock is needed to ensure the brazing quality of cathode support subassembly. INVENTION CONTENTS

[0006] The utility model aims at providing a kind of traveling wave tube cathode support subassembly sealing frock, which can effectively fix each part of cathode support subassembly during brazing, to avoid the displacement of each part.

[0007] The technical scheme for solving the above technical problems of the utility model is: a kind of traveling wave tube cathode support subassembly sealing frock, including the bottom of horizontal arrangement, the bottom upper surface is connected with the emitter installation boss, the emitter installation boss outside is coaxially sleeved with the positioning sleeve that cooperates with its gap, and the positioning sleeve inner wall is equipped with the positioning step for positioning installation cathode support seat, cathode support frame;

[0008] A pressing cap is coaxially arranged above the positioning sleeve, and a emitter pressing block is arranged below the pressing cap and abuts against the upper end surface of the cathode emitter.

[0009] As a further improvement of the utility model, the upper surface of the base is fixed with a positioning sleeve mounting boss, and the positioning sleeve is sleeved outside the positioning sleeve mounting boss; the emitter mounting boss is arranged at the upper end axis of the positioning sleeve mounting boss.

[0010] As a further improvement of the utility model, the positioning sleeve is a graphite sleeve, and a molybdenum sleeve is further sleeved outside the graphite sleeve.

[0011] As a further improvement of the utility model, the vertical installation through hole is arranged at the axis of the support block, and two arc-shaped pressing blocks a are vertically arranged on the lower surface of the support block and arranged along the two outer edges of the installation through hole respectively, and the lower end of the arc-shaped pressing block a abuts against the upper end surface of the cathode support.

[0012] As a further improvement of the utility model, the lower surface of the support frame pressing block is provided with a positioning boss which is inserted and arranged in the installation through hole, and two arc-shaped pressing blocks b are vertically arranged on the lower end surface of the positioning boss and arranged along the two inner edges of the installation through hole respectively, and the lower end of the arc-shaped pressing block b abuts against the upper end surface of the cathode support frame.

[0013] As a further improvement of the utility model, the pressing cap is provided with an arc-shaped gap through which the arc-shaped pressing blocks a and b pass.

[0014] As a further improvement of the utility model, the upper outer wall of the support block and the support frame pressing block is provided with an annular counterweight part.

[0015] As a further improvement of the utility model, 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 utility model, the pressing cap is provided with an emitter upper positioning hole for positioning and mounting the cathode emitter.

[0017] As a further improvement of the utility model, the emitter pressing block is vertically provided with a positioning through hole.

[0018] Advantages

[0019] Compared with the prior art, the row wave tube cathode support assembly sealing tool has the advantages that

[0020] 1. In the tool, the cathode emitter is positioned and installed through the emitter mounting boss and the emitter pressing block, the cathode support seat is positioned and installed through the positioning sleeve and the support seat pressing block, and the cathode support frame is positioned and installed through the positioning sleeve and the support frame pressing block.

[0021] 2. The positioning sleeve is cooperatively used by the graphite sleeve and the molybdenum sleeve.

[0022] The utility model will become more clearly through the following description and combining with the drawings, these drawings are used for explaining the utility model's embodiment. DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will be to the drawing needed to be used in the embodiment or prior art description briefly introduced, obviously, the following description in the drawing is only some embodiments of the utility model, for the ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0024] Figure 1 It is the sectional view of cathode support assembly;

[0025] Figure 2 It is the sectional view of the utility model;

[0026] Figure 3 It is the plan view of the cap of the utility model;

[0027] Figure 4 It is the plan view of the support seat pressing block of the utility model;

[0028] Figure 5 It is the plan view of the support frame pressing block of the utility model;

[0029] Figure 6 It is the cooperation schematic view of the utility model and cathode support assembly.

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

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; of course, they can also refer to a mechanical connection or an electrical connection; furthermore, they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the 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 this utility model are as follows: Figures 2-6 As shown, a tooling for sealing a traveling wave tube cathode support assembly includes a horizontally positioned base 1, with a transmitter mounting boss 12 connected to the upper surface of the base 1. A positioning sleeve is fitted around the transmitter mounting boss 12. The positioning sleeve and the transmitter mounting boss 12 are coaxially aligned, with a certain gap between them for clearance fit. Furthermore, the inner wall of the positioning sleeve is provided with a positioning step 21 for positioning and installing the cathode support seat and cathode support frame—the vertical surface of the positioning step 21 is in positioning contact with the outer wall surface of the cathode support seat; the horizontal surface of the positioning step 21 is in contact with the lower end surface of the cathode support seat and the lower outer edge surface of the cathode support frame. This design allows the entire lower part of the cathode support assembly to be stably placed on the transmitter mounting boss 12 and the positioning step 21, thereby preventing horizontal swaying and downward displacement.

[0036] In order to further fix each part of the cathode support assembly, the tool further coaxially provides a pressing cap 4 above the positioning sleeve, and a emitter pressing block 7 below the pressing cap 4, which is in abutting contact with the upper end surface of the cathode emitter. In the embodiment, the outer edge of the pressing cap 4 extends downward and is in sleeve joint with the outer wall of the positioning sleeve. The upper surface of the pressing cap 4 is provided with a support base pressing block 5 which passes downward through the pressing cap 4 and is in abutting contact with the upper end surface of the cathode support base. The upper surface of the support base pressing block 5 is provided with a support frame pressing block 6 which passes downward through the support base pressing block 5 and the pressing cap 4 and is in abutting contact with the upper end surface of the cathode support frame. Thus, the emitter pressing block 7 can prevent the cathode emitter from moving upward, the support base pressing block 5 can prevent the cathode support base 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 mounting boss 12 and the emitter pressing block 7, position and install the cathode support base through the positioning sleeve and the support base pressing block 5, and position and install the cathode support frame through the positioning sleeve and the support frame pressing block 6, the tool can effectively fix each part of the cathode support assembly during brazing, avoid displacement of each part, thereby avoiding deformation, virtual welding, poor positional tolerance precision and the like of the cathode support assembly after brazing, and further stabilizing the performance of the cathode support assembly 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 base 1 is fixedly provided with a positioning sleeve mounting boss 11 on the upper surface, and the positioning sleeve is sleeved outside the positioning sleeve mounting boss 11. Correspondingly, the emitter mounting boss 12 is arranged at the upper axial center of the positioning sleeve mounting boss 11. In this way, the position between the positioning sleeve and the emitter mounting boss 12 can be kept relatively fixed, thereby stably arranging the entire lower part of the cathode support assembly, avoiding displacement of each part, and further ensuring the product quality.

[0039] In the embodiment, the positioning sleeve is a graphite sleeve 2, and a molybdenum sleeve 3 is further sleeved outside the graphite sleeve 2. The graphite sleeve 2 and the molybdenum sleeve 3 are used in combination. Since the graphite material itself has low surface energy, the brazing filler metal is difficult to infiltrate the graphite surface and cannot adhere, thereby solving the problem of brazing filler metal sticking to the tool. Meanwhile, the strength is higher than that of using the graphite sleeve 2 alone, thereby making the positioning sleeve more durable. In addition, since the thermal expansion coefficients of graphite and molybdenum are close to those of ceramics, and the main material of the cathode support frame is insulating ceramic, the expansion amount difference is small at high temperature, which can play a role in high-precision positioning.

[0040] In the tool, in order to realize the pressing of the upper end face of the cathode support and the upper end face of the cathode support frame, the shaft of the support pressing block 5 vertically penetrates the installation opening 51, and two arc-shaped pressing blocks a52 are vertically arranged on the lower surface of the support pressing block 5 along the two side edges of the installation opening 51. The lower end of the arc-shaped pressing block a52 penetrates the pressing cap 4 downward and abuts against the upper end face of the cathode support. Meanwhile, the lower surface of the support frame pressing block 6 is provided with a positioning boss 61 which is inserted into the installation opening 51, and two arc-shaped pressing blocks b62 are vertically arranged on the lower end face of the positioning boss 61 along the two inner edges of the installation opening 51, and the lower end of the arc-shaped pressing block b62 penetrates the pressing cap 4 downward and abuts against the upper end face of the cathode support frame.

[0041] In the embodiment, the pressing cap 4 is provided with an arc-shaped notch 41 through which the arc-shaped pressing block a52 and the arc-shaped pressing block b62 penetrate. The arc-shaped notch 41 can guide the insertion path of the arc-shaped pressing block a52 and the arc-shaped pressing block b62, so that the upper end face of the cathode support and the upper end face of the cathode support frame are fixed by being pressed downward. Meanwhile, in order to further ensure the stability of the cathode support and the cathode support frame during brazing, the upper outer wall of the support pressing block 5 and the support frame pressing block 6 is provided with a ring-shaped counterweight part. By utilizing the gravity, the shaking and displacement of the cathode support and the cathode support frame are avoided.

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

[0043] The utility model has been described above in combination with the best embodiment, but the utility model is not limited to the above disclosed embodiments, and should cover various modifications, equivalent combinations according to the essence of the utility model.

Claims

1. A tooling for sealing a traveling wave tube cathode support assembly, characterized in that, It includes a horizontally arranged base (1), the upper surface of which is connected to an emitter mounting boss (12), the outer side of which is coaxially fitted with a positioning sleeve with clearance, and the inner wall of the positioning sleeve is provided with a positioning step (21) for positioning and installing a cathode support seat and a cathode support frame. A pressure cap (4) is coaxially provided above the positioning sleeve, and an emitter pressure block (7) is provided below the pressure cap (4) to abut against the upper end face of the cathode emitter. The outer edge of the pressure cap (4) extends downward and fits into the outer wall of the positioning sleeve. A support seat pressure block (5) is provided on the upper surface of the pressure cap (4) to pass downward through the pressure cap (4) and to abut against the upper end face of the cathode support seat. A support frame pressure block (6) is provided on the upper surface of the support seat pressure block (5) to pass downward through the support seat pressure block (5) and the pressure cap (4) in sequence and to abut against the upper end face of the cathode support frame.

2. The tooling for sealing the traveling wave tube cathode support assembly according to claim 1, characterized in that, The upper surface of the base (1) is fixed with a positioning sleeve mounting boss (11), and the positioning sleeve is sleeved on the outside of the positioning sleeve mounting boss (11); the transmitter mounting boss (12) is located at the upper axis of the positioning sleeve mounting boss (11).

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

4. The tooling for sealing the traveling wave tube cathode support assembly according to claim 1, characterized in that, The support base pressure block (5) has a vertically penetrating installation port (51) along its axis, and two arc-shaped pressure blocks a (52) are vertically arranged on the lower surface of the support base pressure block (5) along the outer edges of the two sides of the installation port (51). The lower end of the arc-shaped pressure block a (52) passes downward through the pressure cap (4) and abuts against the upper surface of the cathode support base.

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

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

7. The tooling for sealing the traveling wave tube cathode support assembly according to claim 5 or 6, characterized in that, Both the support base block (5) and the support frame block (6) have annular counterweights on their upper outer walls.

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

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

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