Tool suitable for packaging coaxial resonant cavity and packaging method

Abstract

The invention provides a tool suitable for packaging a coaxial resonant cavity and a packaging method, and the cavity comprises an outer cylinder; the inner cylinder body is formed by extending upwards from the center of the bottom of the outer cylinder body and is provided with a first through hole extending in the axial direction; wherein a first outer step part is formed on the outer wall of the upper part of the inner cylinder, a second outer step part is formed on the first outer step part, an inner step part is formed on the inner wall of the upper part of the outer cylinder, and a center hole of the cavity cover penetrates through the first outer step part, so that the outer edge of the cavity cover is supported on the inner step part; the tool comprises a metal ring which is arranged on the second outer step part and located between the inner cylinder and the center hole of the cavity cover, and at least part of the metal ring extends out of the cavity cover; the clamp is suitable for clamping the bottom of the outer barrel and the cavity cover and pressing the metal ring to deform, so that the metal ring is in contact with the inner barrel and the cavity cover on the second outer step part, and the cavity cover is used for packaging the containing cavity between the outer barrel and the inner barrel.

Description

Technical Field

[0001] At least one embodiment of the present disclosure relates to the field of microwave electric vacuum technology, and in particular to a tooling and packaging method suitable for packaging a coaxial resonant cavity. Background Art

[0002] The klystron is a microwave vacuum device, mainly used for the final power amplification of radar transmitters. The coaxial resonant cavity is the high-frequency interaction circuit of the klystron. The type, structure and working mode of the coaxial resonant cavity need to be selected according to the overall design of the klystron. The characteristics of the coaxial resonant cavity, such as the resonant frequency, resonant impedance ratio (R / Q) and quality factor (Q value), have a decisive influence on the power, efficiency, gain and bandwidth of the klystron. Therefore, in addition to using software to calculate the geometric dimensions of the coaxial resonant cavity that meet the design requirements, the coaxial resonant cavity needs to be cold-tested. The characteristics of the coaxial resonant cavity meet the design requirements before it can be applied to the klystron. The cold test of the coaxial resonant cavity is a key technology in the development of the klystron.

[0003] The coaxial resonant cavity is generally composed of a cavity body and a cavity cover. Due to parts processing, after the cavity and the cavity cover are combined, a gap will appear at the connection between the center column of the cavity and the center hole of the cavity cover, resulting in inconsistent characteristics (resonant frequency and Q value) of the coaxial resonant cavity before and after brazing. Summary of the invention

[0004] In view of this, the present disclosure provides a tooling and packaging method suitable for packaging a coaxial resonant cavity, which can make the characteristics of the coaxial resonant cavity consistent before and after brazing.

[0005] As one aspect of the embodiments of the present disclosure, a tool is provided, which is suitable for forming a seamless contact between the cavity body and the cavity cover of the coaxial resonant cavity, wherein the cavity body includes an outer cylinder and an inner cylinder. The inner cylinder is formed by extending upward from the bottom center of the outer cylinder, and is provided with a first through hole extending axially. A first outer step portion is formed on the upper outer wall of the inner cylinder, a second outer step portion is formed on the first outer step portion, an inner step portion is formed on the upper inner wall of the outer cylinder, and the center hole of the cavity cover passes through the first outer step portion, so that the outer edge of the cavity cover is supported on the inner step portion; the tool includes a metal ring and a clamp. The metal ring is arranged on the second outer step portion, located between the center holes of the inner cylinder and the cavity cover, and at least partially extends out of the cavity cover. The clamp is suitable for clamping the bottom of the outer cylinder and the cavity cover, and compressing the metal ring to deform, so that the metal ring contacts the inner cylinder and the cavity cover respectively on the second outer step portion, so as to utilize the cavity cover to encapsulate the accommodating cavity between the outer cylinder and the inner cylinder.

[0006] According to an embodiment of the present disclosure, the clamp includes a first clamping assembly and a second clamping assembly. The first clamping assembly passes through the center hole and is suitable for pressing the metal ring and the inner edge of the cavity cover toward the inner cylinder. The second clamping assembly is configured to press the outer edge of the cavity cover toward the outer cylinder at the periphery of the first clamping assembly.

[0007] According to an embodiment of the present disclosure, the first clamping assembly includes a first rod and two fasteners. The first rod passes through the first through hole and extends from both ends of the first through hole. The two fasteners are respectively threadedly coupled to both ends of the first rod and respectively abut against the center of the bottom wall of the outer cylinder and the metal ring, so that the metal ring is deformed by tightening the fasteners.

[0008] According to an embodiment of the present disclosure, the first clamping assembly further includes a clamping ring, which is sleeved on the periphery of the second outer step portion of the inner cylinder and abuts between the metal ring and the fastener to compress the metal ring under the action of the fastener.

[0009] According to an embodiment of the present disclosure, the chamber cover and the outer cylinder are respectively formed with a re-entrant drift head coaxial with the outer cylinder, and the second clamping assembly includes two clamping rings and a locking unit. Each of the two clamping rings is arranged on the periphery of the third through hole on the re-entrant drift head, and the locking unit clamps the two clamping rings so that the chamber cover is placed on the inner step.

[0010] According to an embodiment of the present disclosure, the outer diameter of the two clamping rings is greater than the outer diameter of the inner cylinder, and a plurality of fourth through holes are provided on the periphery of the outer cylinder; the locking unit comprises a plurality of second rods and a plurality of locking members, each of the second rods respectively passes through the fourth through holes on the two clamping plates and extends from two ends of the two fourth through holes that are far away from each other. Each two locking members are threadedly coupled to the two ends of one second rod, so that the outer cylinder and the cavity cover are clamped between the two clamping plates by tightening the locking members.

[0011] According to an embodiment of the present disclosure, the cross-sectional shape of the metal ring in the radial direction includes a circle, an ellipse or a rectangle.

[0012] According to an embodiment of the present disclosure, the material of the metal ring includes silver-copper alloy.

[0013] As another aspect of the embodiments of the present disclosure, a packaging method of a coaxial resonant cavity is provided, using any of the above-mentioned tooling, the packaging method comprising:

[0014] Using a second clamping assembly, the cavity cover of the coaxial resonant cavity is restrained on the inner step portion;

[0015] placing a metal ring between the inner cylinder and the center hole of the cavity cover and on the second outer step;

[0016] The first clamping assembly is used to pass through the central hole of the coaxial resonant cavity, and press the metal ring and the inner edge of the cavity cover toward the inner cylinder, forcing the metal ring to deform, so that the metal ring contacts the inner cylinder and the cavity cover respectively on the second outer step portion, so as to utilize the cavity cover to encapsulate the accommodating cavity between the outer cylinder and the inner cylinder.

[0017] According to an embodiment of the present disclosure, the second clamping assembly is used to restrict the cavity cover of the coaxial resonant cavity to the inner step, and in the process of using the first clamping assembly to compress the metal ring to produce deformation,

[0018] The cavity cover is allowed to move in the radial direction, so that after the metal ring contacts the inner cylinder and the cavity cover respectively on the second outer step, the second clamping assembly is again used to press the outer edge of the cavity cover toward the outer cylinder at the periphery of the first clamping assembly.

[0019] According to the tooling of the embodiment of the present disclosure, the metal ring is arranged on the second outer step portion of the coaxial resonant cavity and is located between the central holes of the inner cylinder and the cavity cover, and at least partially extends out of the cavity cover. The metal ring is compressed and deformed by a clamp so that the inner side of the metal ring contacts the inner cylinder and the outer side of the metal ring contacts the cavity cover to encapsulate the accommodating cavity between the outer cylinder and the inner cylinder, thereby achieving a good electrical connection between the cavity and the cavity cover, and ensuring that the characteristics (resonance frequency and Q value) of the coaxial resonant cavity before and after brazing are consistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0021] Figure 1 A cross-sectional view of a coaxial resonant cavity in the related art is schematically shown;

[0022] Figure 2 A three-dimensional diagram schematically shows a cavity cover in the related art;

[0023] Figure 3 Schematically shows Figure 2 A cross-sectional view of the cavity cover shown in the radial direction;

[0024] Figure 4 A three-dimensional diagram of a cavity in the related art is schematically shown;

[0025] Figure 5 Schematically shows Figure 4 A cross-sectional view of the cavity shown in the radial direction;

[0026] Figure 6 The magnetic field distribution diagram of the coaxial resonant cavity in the related art is schematically shown;

[0027] Figure 7 Schematically shows a cross-sectional view of a tooling and a coaxial resonant cavity according to an embodiment of the present disclosure;

[0028] Figure 8 A perspective view of a cavity according to an embodiment of the present disclosure is schematically shown;

[0029] Fig. 9 Schematically shows Figure 8 A cross-sectional view of the cavity shown in the radial direction;

[0030] Fig.10 Schematically shows a three-dimensional view of a cavity cover according to an embodiment of the present disclosure;

[0031] Fig.11 Schematically shows Fig.10 A cross-sectional view of the cavity cover shown in the radial direction;

[0032] Fig.12 schematically shows a cross-sectional view of a metal ring in a first state according to an embodiment of the present disclosure;

[0033] Fig.13 Schematically shows Fig.12 A partial enlarged view of part A shown;

[0034] Fig.14 Schematically shows a cross-sectional view of a metal ring in a second state according to an embodiment of the present disclosure;

[0035] Fig.15 Schematically shows Fig.14 An enlarged fragmentary view of portion B shown; and

[0036] Fig.16 The flowchart of the packaging method of the coaxial resonant cavity according to the embodiment of the present disclosure is schematically shown.

[0037] The following are the descriptions of the reference numerals:

[0038] 1- Coaxial resonant cavity;

[0039] 11- cavity;

[0040] 111-Outer cylinder;

[0041] 1111-inner step;

[0042] 112-Inner cylinder;

[0043] 113- Second outer step

[0044] 114-first through hole;

[0045] 115-first outer step portion;

[0046] 12- cavity cover;

[0047] 121-center hole;

[0048] 122- medial annulus;

[0049] 123 - outer annulus;

[0050] 13-Reentrant drift head;

[0051] 2-Tooling;

[0052] 21-Metal ring;

[0053] 22-Clamp;

[0054] 221-first clamping assembly;

[0055] 2211-first rod;

[0056] 2212-Fasteners;

[0057] 2213-Compression ring;

[0058] 222- second clamping assembly;

[0059] 2221-clamp ring;

[0060] 2222-locking unit;

[0061] 2223-second rod;

[0062] 2224-locking piece;

[0063] 3- Cavity;

[0064] 31-Outer cylinder;

[0065] 311-inner step;

[0066] 32-Center column;

[0067] 321-Inner cylinder;

[0068] 322-outer step portion;

[0069] 4-Cavity cover;

[0070] 41-center hole;

[0071] 42-Reentrant drift head;

[0072] 43- medial annulus;

[0073] 44-Outer annulus. DETAILED DESCRIPTION

[0074] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0075] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0076] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification, and should not be interpreted in an idealized or overly rigid manner.

[0077] When using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, and C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc. When using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, or C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.

[0078] It should also be noted that the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "back", "left", "right", etc., are only reference directions of the drawings and are not intended to limit the scope of protection of the present disclosure. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or configurations will be omitted when they may cause confusion in the understanding of the present disclosure.

[0079] Figure 1 A cross-sectional view of a coaxial resonant cavity in the related art is schematically shown.

[0080] In the process of implementing the present disclosure, it is found that Figure 1As shown, the coaxial resonant cavity generally includes a cavity body 3 and a cavity cover 4. The cavity body 3 includes an outer cylinder body 31 and a central column 32. The central column 32 includes an inner cylinder body 321 and an outer step portion 322 formed on the upper outer wall of the inner cylinder body 321. The inner cylinder body 321 extends upward from the bottom center of the outer cylinder body 31 and is provided with an axially extending through hole. An inner step portion 311 is formed on the upper inner wall of the outer cylinder body 31, and the central hole 41 of the cavity cover 4 passes through the inner cylinder body 321, so that the outer edge of the cavity cover 4 is supported on the inner step portion 311.

[0081] Figure 2 A three-dimensional diagram schematically shows a cavity cover in the related art. Figure 3 Schematically shows Figure 2 A cross-sectional view of the cavity cover along the radial direction is shown.

[0082] like Figures 1 to 3 As shown, the cavity cover 4 of the coaxial resonant cavity has an annular reentrant drift head 42, which results in that the inner annular surface 43 located inside the reentrant drift head 42 and the outer annular surface 44 located outside the reentrant drift head 42 of the cavity cover 4 cannot be processed at one time, and only one side of the annular surface can be processed first. After the size is processed in place, the lathe tool needs to be recalibrated to process the annular surface on the other side. However, the processing of the current processing lathe generally has a certain processing accuracy (for example, 0.02mm), which makes it impossible to make the inner annular surface 43 and the outer annular surface 44 located on the same horizontal plane, such as Figure 3 As shown, the distance D1 between the outer annular surface 44 and the outer surface of the cavity cover 4 is not equal to the distance D2 between the inner annular surface 43 and the outer surface of the cavity cover 4 (D1≠D2).

[0083] Figure 4 A three-dimensional diagram of a cavity in the related art is schematically shown. Figure 5 Schematically shows Figure 4 A cross-sectional view of the cavity along the radial direction is shown.

[0084] like Figure 1 , Figure 4 and Figure 5 As shown, although the cavity 3 of the coaxial resonant cavity also has two positioning connection surfaces (i.e., the upper surface of the inner step portion 311 and the upper surface of the outer step portion 322), there is no structure between the two positioning surfaces to block the translation of the turning tool. Therefore, the two positioning surfaces can be processed at one time, thereby ensuring that the two positioning connection surfaces on the cavity are in the same horizontal plane.

[0085] Because the inner annular surface 43 and the outer annular surface 44 of the cavity cover 4 with the re-entrant drift head 42 cannot be in the same horizontal plane during processing, two positioning connection surfaces that are not in the same horizontal plane are generated after the cavity body 4 and the cavity cover 3 are assembled. When the cavity 4 and the cavity cover 3 are fixed with a clamp, only one of the positioning connection surfaces can be ensured to be tightly connected to form a good electrical contact.

[0086] For example, in Figure 1 The cylindrical coaxial resonant cavity shown is selected to ensure that the upper surface of the inner step portion 311 of the cavity 3 and the outer annular surface 44 of the cavity cover 4 are in close contact, and a good electrical contact without gap is formed after being fixed by a clamp.

[0087] Figure 6 The magnetic field distribution diagram of the coaxial resonant cavity in the related art is schematically shown.

[0088] Figure 6 The concentric circles with arrows in the middle represent the magnetic field density and intensity. Figure 6 As shown, the magnetic field of the coaxial resonant cavity is respectively concentrated between the central column 32 and the outer cylinder 31 of the coaxial resonant cavity. Therefore, when the coaxial resonant cavity is cold-tested before brazing, if a good electrical connection between the cavity body 3 and the cavity cover 4 cannot be achieved, the microwave magnetic field will pass through the gap (for example, Figure 1 The coaxial resonant cavity is radiated from the gap between the upper surface of the middle and outer step parts and the inner annular surface of the cavity cover, thereby causing the resonant frequency of the fundamental mode of the coaxial resonant cavity to be different from the resonant frequency and Q value of the fundamental mode of the closed coaxial resonant cavity.

[0089] After the coaxial resonant cavity welding is completed, the electrical connection state between the cavity 3 and the cavity cover 4 changes because the gap is filled with solder, that is, the cavity 3 and the cavity cover 4 have achieved a good seamless connection, and the microwave magnetic field signal will no longer radiate out of the cavity. At this time, when the resonant cavity characteristics are cold measured, the fundamental mode resonant frequency of the coaxial resonant cavity is the resonant frequency of the closed cavity.

[0090] From the above cold test process and analysis, it can be seen that the inconsistent magnetic field distribution state of the microwave signal in the coaxial resonant cavity during the two cold tests is the main reason for the inconsistency of the characteristics (resonant frequency and Q value) of the resonant cavity before and after brazing.

[0091] Therefore, when designing the structure of the coaxial resonant cavity and the cavity cover and processing the parts, it is necessary to try to ensure that the surfaces of the brazed connection between the cavity and the cavity cover can achieve good and seamless contact. If there is no gap between the positioning connection surface of the cavity and the cavity cover, two clamps can be used as a fixture to achieve good electrical connection between the cavity and the cavity cover during cold testing.

[0092] The function of the cold test fixture is mainly to ensure that the cavity and cavity cover of the coaxial resonant cavity are tightly connected through the positioning surface, maintain good electrical contact and can be repeatedly disassembled and assembled without deformation. Since the cavity and cavity cover fixed by the fixture can be repeatedly disassembled and assembled, the coaxial resonant cavity characteristics can be tested in this state, and the dimensions of the cavity and cavity cover can be corrected according to the test data. When the dimensions of the cavity and cavity cover are corrected, their characteristics have met the design requirements, and the cavity and cavity cover can be connected by brazing to achieve airtightness and good electrical contact. After brazing is completed, the characteristics of the coaxial resonant cavity cannot be corrected. Therefore, for the combined structure of the coaxial resonant cavity, it is a key technology to design a reasonable cold test fixture and method to ensure the consistency of the characteristics of the resonant cavity before and after brazing.

[0093] In the fixture of the related art, it is easy to achieve good electrical contact without gaps between the upper surface of the inner step and the outer annular surface, and the solder filling the side seam after brazing will not change the electrical connection state. However, between the upper surface of the outer step part at the center column and the inner annular surface of the cavity cover, a large force needs to be applied to deform the inner annular surface to contact the upper surface of the outer step part. When brazing, a large force should also be used to perform the same operation, and it is ensured that the fastening nut will not loosen due to thermal expansion and contraction during high-temperature brazing, so that the state of the resonant cavity before and after brazing can be consistent.

[0094] However, in actual operation, especially during high-temperature welding, the cavity cover that is deformed by strong pressure will release a lot of stress to loosen the fastening nut, resulting in changes in the characteristics of the resonant cavity after brazing. When the frequency changes after brazing, the traditional method often uses external force to change the volume of the resonant cavity to adjust it. If the frequency deviation is large, it cannot be adjusted by changing the cavity volume. This situation hinders the application and development of coaxial resonant cavities in klystrons.

[0095] Figure 7 A cross-sectional view of a tooling and a coaxial resonant cavity according to an embodiment of the present disclosure is schematically shown.

[0096] As one aspect of the embodiments of the present disclosure, Figure 7As shown, a tool 2 is provided, which is suitable for forming a seamless contact between the cavity 11 and the cavity cover 12 of the coaxial resonant cavity 1, wherein the cavity 11 includes an outer cylinder 111 and an inner cylinder 112. The inner cylinder 112 is formed by extending upward from the bottom center of the outer cylinder 111, and is provided with a first through hole 114 extending axially, wherein a first outer step portion 115 is formed on the upper outer wall of the inner cylinder 112, a second outer step portion 113 is formed on the first outer step portion 115, and an inner step portion 1111 is formed on the upper inner wall of the outer cylinder 111, and the center hole of the cavity cover 12 passes through the first outer step portion 115, so that the outer edge of the cavity cover 12 is supported on the inner step portion 1111. The tool 2 includes a metal ring 21 and a clamp 22. The metal ring 21 is arranged on the second outer step portion 113, located between the inner cylinder 112 and the center hole 121 of the cavity cover 12, and at least partially extends out of the cavity cover 12. The clamp 22 is suitable for clamping the bottom of the outer cylinder 111 and the cavity cover 12, and compressing the metal ring 21 to deform, so that the metal ring 21 contacts the inner cylinder 112 and the cavity cover 12 respectively on the second outer step portion 113, so as to utilize the cavity cover 12 to encapsulate the accommodating cavity between the outer cylinder 111 and the inner cylinder 112.

[0097] According to the tooling 2 of the embodiment of the present disclosure, the metal ring 21 is arranged on the second outer step portion 113 of the coaxial resonant cavity 1 and is located between the inner cylinder 112 and the center hole 121 of the cavity cover 12, and at least partially extends out of the cavity cover 12. The metal ring 21 is compressed and deformed by the clamp 22, so that the inner side of the metal ring 21 contacts the inner cylinder 112, and the outer side of the metal ring 21 contacts the cavity cover 12, so that the cavity cover 12 is used to encapsulate the accommodating cavity between the outer cylinder 111 and the inner cylinder 112, so as to achieve good electrical connection between the cavity 11 and the cavity cover 12, and ensure that the characteristics (resonance frequency and Q value) of the coaxial resonant cavity 1 before and after brazing are consistent.

[0098] Figure 8 A three-dimensional diagram of a cavity according to an embodiment of the present disclosure is schematically shown. Fig. 9 Schematically shows Figure 8 A cross-sectional view of the cavity shown in the radial direction.

[0099] like Figure 1 , Figure 8 and Fig. 9 As shown, the cavity 11 of the coaxial resonant cavity 1 includes an inner cylinder 112 and an outer cylinder 111. The inner cylinder 112 serves as a central column of the coaxial resonant cavity 1.

[0100] A reentrant drift head 13 coaxial with the outer cylinder 111 is formed on the outer cylinder 111. The reentrant drift head 13 has one or more inwardly curved parts to form a spiral or ring-like structure to increase the gradient of the electric field, thereby improving the Q value (quality factor) of the resonant cavity.

[0101] Fig.10 Schematically shows a three-dimensional view of a cavity cover according to an embodiment of the present disclosure, Fig.11 Schematically shows Fig.10 A cross-sectional view of the cavity cover along the radial direction is shown.

[0102] like Fig.10 and Fig.11 As shown, a re-entrant drift head 13 coaxial with the outer cylinder 111 is formed on the chamber cover 12 .

[0103] In an illustrative embodiment, Figure 7 , Fig.10 and Fig.11 As shown, in the lower surface of the chamber cover 12, the outer annular surface 123 is located outside the re-entrant drift head 13, and the inner annular surface 122 is located inside the re-entrant drift head 13. The first distance (D1) between the outer annular surface 123 and the upper surface of the chamber cover 12 is greater than or equal to the second distance (D2) between the inner annular surface 122 and the upper surface of the chamber cover 12.

[0104] According to the embodiments of the present disclosure, Figure 7 As shown, the clamp 22 includes a first clamping assembly 221 and a second clamping assembly 222. The first clamping assembly 221 passes through the central hole 121 and is suitable for pressing the metal ring 21 and the inner edge of the cavity cover 12 toward the inner cylinder 112. The second clamping assembly 222 is configured to press the outer edge of the cavity cover 12 toward the outer cylinder 111 at the periphery of the first clamping assembly 221.

[0105] In such an embodiment, the first clamping assembly 221 presses the inner edges of the metal ring 21 and the cavity cover 12 toward the inner cylinder 112, and the second clamping assembly 222 presses the outer edge of the cavity cover 12 toward the outer cylinder 111 at the periphery of the first clamping assembly 221, so that the metal ring 21, the cavity cover 12 and the cavity 11 are in close contact, thereby achieving good electrical contact, which can effectively eliminate the gap between the cavity 11 and the cavity cover 12 and prevent microwave signals from leaking from the gap, thereby ensuring the resonance characteristics and Q value of the resonant cavity.

[0106] Fig.12 Schematically shows a cross-sectional view of a metal ring in a first state according to an embodiment of the present disclosure, Fig.13 Schematically shows Fig.12 A partial enlarged view of part A shown, Fig.14 Schematically shows a cross-sectional view of a metal ring in a second state according to an embodiment of the present disclosure, Fig.15 Schematically shows Fig.14 A partial enlarged view of part B is shown.

[0107] According to the embodiments of the present disclosure, Figure 7As shown, the first clamping assembly 221 includes a first rod 2211 and two fasteners 2212. The first rod 2211 passes through the first through hole 114 and extends from both ends of the first through hole 114. The two fasteners 2212 are respectively threadedly coupled to both ends of the first rod 2211 and respectively abut against the center of the bottom wall of the outer cylinder 111 and the metal ring 21, so that the metal ring 21 is deformed by tightening the fasteners 2212, for example, Fig.12 and Fig.13 The first state shown is deformed into Fig.14 and Fig.15 The second state shown (the cross-sectional shape of the metal ring 21 in the radial direction changes from a circle to an ellipse) realizes uniform pressure on the metal ring 21 and controls the deformation, thereby ensuring good contact between the metal ring 21 and the cavity 11 and the cavity cover 12, improving the test efficiency and accuracy, and facilitating repeated use.

[0108] In an exemplary embodiment, the fastener 2212 may be a nut.

[0109] In an illustrative embodiment, the first rod 2211 may be a rod with threads at both ends, or a screw.

[0110] According to the embodiments of the present disclosure, Figure 7 As shown, the first clamping assembly 221 also includes a clamping ring 2213, which is sleeved on the periphery of the second outer step portion 113 of the inner cylinder 112 and abuts between the metal ring 21 and the fastener 2212 to compress the metal ring 21 under the action of the fastener 2212.

[0111] In such an embodiment, the clamping ring 2213 is located between the metal ring 21 and the fastener 2212, which can disperse the direct pressure of the fastener 2212 on the metal ring 21 and prevent the metal ring 21 from being deformed or damaged due to excessive local pressure.

[0112] It is understandable that the clamping ring 2213 can be separately or integrally provided with the fastener 2212 .

[0113] According to the embodiments of the present disclosure, Figures 7 to 11 As shown, the chamber cover 12 and the outer cylinder 111 are respectively formed with a re-entry drift head 13 coaxial with the outer cylinder 111. Figure 7 As shown, the second clamping assembly 222 includes two clamping rings 2221 and a locking unit 2222. Each clamping ring 2221 is arranged at the periphery of the third through hole on the re-entry drift head 13, and the locking unit clamps the two clamping rings 2221 so that the chamber cover 12 is placed on the inner step 1111.

[0114] In such an embodiment, the cavity cover 12 can be firmly fixed on the inner step 1111 by clamping the two clamp rings 2221 with the locking unit 2222, thereby preventing the cavity cover 12 from displacement or deformation during the test process, thereby ensuring the accuracy of the test results. The design of the two clamp rings 2221 and the locking unit 2222 allows for repeated disassembly and assembly, facilitating cold testing and debugging of the coaxial resonant cavity 1, and making dimensional corrections based on the test results.

[0115] According to the embodiments of the present disclosure, Figure 7 As shown, the outer diameter of the two clamping rings 2221 is larger than the outer diameter of the inner cylinder 112, and a plurality of fourth through holes are provided on the periphery of the outer cylinder 111. The locking unit 2222 includes a plurality of second rods 2223 and a plurality of locking members 2224. Each second rod 2223 passes through the fourth through holes on the two clamping plates and extends from two ends of the two fourth through holes that are far away from each other. Every two locking members 2224 are threadedly coupled to the two ends of a second rod 2223, so that the outer cylinder 111 and the chamber cover 12 are clamped between the two clamping rings 2221 by tightening the locking members 2224.

[0116] In an illustrative embodiment, the locking member 2224 may be a nut.

[0117] In an illustrative embodiment, the second rod 2223 may be a rod with threads at both ends, or a screw.

[0118] According to an embodiment of the present disclosure, a cross-sectional shape of the metal ring 21 in the radial direction includes a circle, an ellipse, or a rectangle.

[0119] According to an embodiment of the present disclosure, the material of the metal ring 21 includes silver-copper alloy.

[0120] In an illustrative embodiment, the metal ring 21 is made of Agcu72. Agcu72 is a soft alloy with certain elasticity and toughness, which is very easy to deform without breaking after being subjected to a small pressure. It is understandable that the metal ring 21 can also be replaced by other soft, elastic and tough metal rings, as long as it can achieve good contact with the cavity 11 and the cavity cover 12 after being deformed by pressure.

[0121] In an illustrative embodiment, Fig.12 and Fig.13 As shown, the cross section of the metal ring 21 along the radial direction is circular, and the cavity body 11 and the cavity cover 12 are assembled and the metal ring 21 is placed. In order to enable the metal ring 21 to be placed on the second outer step portion 113 and to be in tangential contact with the second outer step portion 113, the outer diameter of the metal ring 21 is smaller than the diameter of the center hole 121, and the inner diameter of the metal ring 21 is larger than the outer diameter of the inner cylinder 112.

[0122] Furthermore, the second clamping assembly 222 is used to restrict the cavity cover 12 of the coaxial resonant cavity 1 on the inner step, and the first clamping assembly 221 is used to pass through the central hole 121 of the coaxial resonant cavity 1 and press the metal ring 21 and the inner edge of the cavity cover 12 toward the inner cylinder 112, so that the metal ring 21 is deformed, so that the cross section of the metal ring 21 in the radial direction is compressed from a circle to an ellipse. The deformed metal ring 21 is as shown in FIG. Fig.14 and Fig.15 As shown, the metal ring 21 can be on the second outer step portion 113 , in contact with the inner cylinder 112 on the inner side, and in contact with the cavity cover 12 on the outer side, thereby achieving good electrical contact between the cavity cover 12 and the cavity 11 .

[0123] Fig.16 The flowchart of the packaging method of the coaxial resonant cavity according to the embodiment of the present disclosure is schematically shown.

[0124] As another aspect of the embodiments of the present disclosure, a packaging method of a coaxial resonant cavity 1 is provided, using any of the above-mentioned tooling 2, such as Fig.16 As shown, the packaging method includes operations S1610 to S1630.

[0125] In operation S1610, a cavity cover of the coaxial resonant cavity is restrained on the inner step portion using a second clamping assembly.

[0126] In operation S1620, a metal ring is placed between the inner cylinder and the central hole of the cavity cover and on the second outer step portion.

[0127] In operation S1630, the first clamping assembly is used to pass through the central hole of the coaxial resonant cavity, and the inner edge of the metal ring and the cavity cover are pressed toward the inner cylinder, forcing the metal ring to deform, so that the metal ring contacts the inner cylinder and the cavity cover respectively on the second outer step portion, so as to utilize the cavity cover to encapsulate the accommodating cavity between the outer cylinder and the inner cylinder.

[0128] According to the packaging method of the embodiment of the present disclosure, the metal ring 21 and the inner edge of the cavity cover 12 are pressed by the first clamping assembly 221, and the metal ring 21 is pressed to deform, so that the metal ring 21 can be respectively contacted with the inner cylinder 112 and the cavity cover 12 on the second outer step 113, thereby achieving good electrical contact and ensuring the transmission efficiency of microwave signals. In addition, the packaging method allows the tooling 2 and the coaxial resonant cavity 1 to be repeatedly disassembled and assembled, which is convenient for the maintenance and replacement of the coaxial resonant cavity 1.

[0129] It can be understood that the above operation S1620 may be performed before operation S1610.

[0130] According to an embodiment of the present disclosure, the cavity cover 12 of the coaxial resonant cavity 1 is restricted on the inner step by using the second clamping assembly 222. In the process of using the first clamping assembly 221 to compress the metal ring 21 to produce deformation, the cavity cover 12 is allowed to move in the radial direction, so that after the metal ring 21 contacts the inner cylinder 112 and the cavity cover 12 respectively on the second outer step portion 113, the second clamping assembly 222 is used again to press the outer edge of the cavity cover 12 toward the outer cylinder 111 at the periphery of the first clamping assembly 221.

[0131] Since there may be certain dimensional errors between the cavity cover 12 and the inner cylinder 112 during the processing, the cavity cover 12 of the coaxial resonant cavity 1 is restricted on the inner step by using the second clamping component 222. In the process of using the first clamping component 221 to compress the metal ring 21 to produce deformation, the cavity cover 12 is allowed to move in the radial direction. This allows the metal ring 21 to have a certain radial deformation space during the deformation process, making the deformation of the metal ring 21 more uniform and increasing the contact area between the inner cylinder 112 and the cavity cover 12.

[0132] In an illustrative embodiment, after the first cold test is completed and the data is recorded using the above packaging method, the cavity 11 and cavity cover 12 of the coaxial resonant cavity 1 are clamped before brazing. During clamping, the outer edge of the cavity cover 12 is limited to the inner step by the second clamping assembly 222, and the metal ring 21 is replaced with the same metal material as the cavity 11 and the cavity cover 12, and the metal ring 21 is placed on the second outer step 113. The metal ring 21 placed on the second outer step 113 is tapped by clicking to deform the metal ring 21 and make it tightly contact with the inner cylinder 112 and the cavity cover 12. At this time, the coaxial resonant cavity 1 is cold tested for the second time. If the characteristics of the coaxial resonant cavity 1 are consistent with the first cold test characteristics, the clamping is completed. If not, the metal ring 21 can be tapped again to increase the number of contact points between the metal ring 21 and the inner cylinder 112 and the cavity cover 12 until the characteristics of the coaxial resonant cavity 1 are consistent with the first test data.

[0133] After clamping is completed, solder is placed on the metal ring 21 and the outer circumferential brazing welding surface. During high-temperature welding, the solder melts to form an airtight and good electrical contact between the cavity 11 and the cavity cover 12. Finally, the characteristic test of the coaxial resonant cavity 1 after brazing is completed.

[0134] Since the electrical connection characteristics of the cavity body 11 and the cavity cover 12 are not changed before and after brazing, the characteristics of the coaxial resonant cavity 1 are tested by using the tooling 2 and packaging method provided by the present disclosure, and the characteristics of the coaxial resonant cavity 1 remain consistent before and after brazing.

[0135] The embodiments of the present disclosure are described above. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. The scope of the present disclosure is defined by the attached claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A tool, characterized in that: It is suitable for forming a seamless contact between the cavity body and the cavity cover of the coaxial resonant cavity, wherein: The cavity comprises: an outer cylinder; and The inner cylinder is formed by extending upward from the bottom center of the outer cylinder and is provided with a first through hole extending axially; Wherein, a first outer step portion is formed on the upper outer wall of the inner cylinder, a second outer step portion is formed on the first outer step portion, an inner step portion is formed on the upper inner wall of the outer cylinder, and the central hole of the cavity cover passes through the first outer step portion, so that the outer edge of the cavity cover is supported on the inner step portion; The tooling includes: a metal ring, disposed on the second outer step portion, located between the inner cylinder and the central hole of the cavity cover, and at least partially extending out of the cavity cover; and The clamp is suitable for clamping the bottom of the outer cylinder and the cavity cover, and compressing the metal ring to deform, so that the metal ring contacts the inner cylinder and the cavity cover respectively on the second outer step portion, so as to use the cavity cover to encapsulate the accommodating cavity between the outer cylinder and the inner cylinder.

2. The tooling according to claim 1, characterized in that: The clamp comprises: a first clamping assembly passing through the central hole and adapted to press the metal ring and the inner edge of the cavity cover toward the inner cylinder; and The second clamping assembly is configured to press the outer edge of the cavity cover toward the outer cylinder at the periphery of the first clamping assembly.

3. The tooling according to claim 2, characterized in that: The first clamping assembly comprises: a first rod member passing through the first through hole and extending from both ends of the first through hole; and Two fasteners are respectively threadedly connected to the two ends of the first rod and respectively abut against the center of the bottom wall of the outer cylinder and the metal ring, so that the metal ring is deformed by tightening the fasteners.

4. The tooling according to claim 3, characterized in that: The first clamping assembly also includes: The clamping ring is sleeved on the periphery of the second outer step portion of the inner cylinder and abuts between the metal ring and the fastener to compress the metal ring under the action of the fastener.

5. The tooling according to any one of claims 2 to 4, characterized in that: The chamber cover and the outer cylinder are respectively formed with a re-entry drift head coaxial with the outer cylinder, and the second clamping assembly includes: two clamp rings, each of which is disposed on the periphery of the third through hole on the reentrant drift head; and The locking unit clamps the two clamping rings so that the cavity cover is placed on the inner step.

6. The tooling according to claim 5, characterized in that: The outer diameters of the two clamp rings are larger than the outer diameter of the inner cylinder, and a plurality of fourth through holes are arranged opposite to each other on the periphery of the outer cylinder; The locking unit comprises: a plurality of second rods, each of which passes through the opposite fourth through holes on the two clamping plates and extends from two ends of the two fourth through holes that are far away from each other; and A plurality of locking members, each two of which are threadedly coupled to two ends of one of the second rods, so that the outer cylinder and the cavity cover are clamped between the two clamping plates by tightening the locking members.

7. The tooling according to claim 1, characterized in that: The cross-sectional shape of the metal ring in the radial direction includes a circle, an ellipse or a rectangle.

8. The tooling according to claim 1, characterized in that: The material of the metal ring includes silver-copper alloy.

9. A packaging method for a coaxial resonant cavity, characterized in that: Using the tooling as described in any one of claims 1 to 8, the packaging method includes: Using a second clamping assembly, the cavity cover of the coaxial resonant cavity is restrained on the inner step portion; placing a metal ring between the inner cylinder and the center hole of the cavity cover and on the second outer step; A first clamping assembly is used to pass through the center hole of the coaxial resonant cavity, and to press the metal ring and the inner edge of the cavity cover toward the inner cylinder, forcing the metal ring to deform so that the metal ring contacts the inner cylinder and the cavity cover respectively on the second outer step portion, so as to utilize the cavity cover to encapsulate the accommodating cavity between the outer cylinder and the inner cylinder.

10. The packaging method according to claim 9, characterized in that: The second clamping assembly is used to restrict the cavity cover of the coaxial resonant cavity to the inner step, and in the process of using the first clamping assembly to compress the metal ring to produce deformation, The cavity cover is allowed to move in the radial direction so that after the metal ring contacts the inner cylinder and the cavity cover respectively on the second outer step portion, the second clamping assembly is used again to press the outer edge of the cavity cover toward the outer cylinder at the periphery of the first clamping assembly.

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