Tooling and method for encapsulating a coaxial resonant cavity

Abstract

The present disclosure provides a tool and a packaging method suitable for packaging a coaxial resonant cavity, wherein the cavity comprises: an outer cylinder; an inner cylinder extending upward from the center of the bottom of the outer cylinder and provided with an axially extending first through hole; 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 tool comprises: a metal ring arranged on the second outer step portion, located between the inner cylinder and the central hole of the cavity cover, and at least partially protruding from the cavity cover; and a clamp suitable for clamping the bottom of the outer cylinder and the cavity cover and pressing the metal ring to deform, so that the metal ring is in contact with the inner cylinder and the cavity cover on the second outer step portion, respectively, to package the containing cavity between the outer cylinder and the inner cylinder with the cavity cover.

Description

TECHNICAL FIELD

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

[0002] A klystron is a kind of 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, and the type, structure and working mode of the coaxial resonant cavity need to be selected according to the overall design scheme of the klystron. The characteristics of the coaxial resonant cavity, such as resonant frequency, resonant impedance ratio (R / Q) and quality factor (Q value), have a decisive influence on the performance of the klystron, such as power, efficiency, gain and bandwidth. Therefore, in addition to calculating the geometric size of the coaxial resonant cavity that meets the design requirements by using software, the coaxial resonant cavity also needs to be cold measured. Only when the characteristics of the coaxial resonant cavity meet the design requirements can it be applied to the klystron. The cold measurement test of the coaxial resonant cavity is a key technology in the development process of the klystron.

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

[0004] Therefore, the present disclosure provides a tool and a 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 an aspect of an embodiment of the present disclosure, a tool is provided, which is suitable for forming a gapless contact between a cavity and a cover of a coaxial resonant cavity, wherein the cavity includes an outer cylinder and an inner cylinder. The inner cylinder extends upward from the center of the bottom of the outer cylinder and is provided with a first through hole extending in the axial direction. 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 cover passes through the first outer step portion so that the outer edge of the 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 and located between the inner cylinder and the center hole of the cover, and at least partially extends out of the cover. The clamp is suitable for clamping the bottom of the outer cylinder and the cover and compressing the metal ring to deform, so that the metal ring is in contact with the inner cylinder and the cover on the second outer step portion, respectively, to package the accommodation cavity between the outer cylinder and the inner cylinder by using the cover.

[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 central hole and is adapted to press the inner edge of the cavity cover and the metal ring towards the inner cylinder. The second clamping assembly is configured to press the outer edge of the cavity cover towards 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 combined at 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 pressing 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 press the metal ring under the action of the fastener.

[0009] According to an embodiment of the present disclosure, the cavity cover and the outer cylinder are respectively formed with a reentrant 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 at the periphery of the third through hole on the reentrant drift head, and the locking unit clamps the two clamping rings to make the cavity cover rest 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 formed on the periphery of the outer cylinder. The locking unit includes a plurality of second rods and a plurality of locking members. Each of the second rods passes through the opposite fourth through holes on the two clamping plates and extends from the two ends of the fourth through holes. Each of the two locking members is threadedly combined with the two ends of the second rod to clamp the outer cylinder and the cavity cover 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 embodiment of the present disclosure, a packaging method of a coaxial resonant cavity is provided, which uses any of the above-mentioned tooling. The packaging method includes:

[0014] Restricting the cavity cover of the coaxial resonant cavity on the inner step portion by the second clamping assembly;

[0015] The metal ring is arranged between the central hole of the inner cylinder and the cavity cover and on the second outer step;

[0016] The first clamping assembly is used to press the metal ring and the inner edge of the cavity cover towards the inner cylinder through the central hole of the coaxial resonant cavity, and the metal ring is deformed to contact the inner cylinder and the cavity cover on the second outer step, so as to encapsulate the containing cavity between the outer cylinder and the inner cylinder by the cavity cover.

[0017] According to the embodiment of the present disclosure, the second clamping assembly is used to limit the cavity cover of the coaxial resonant cavity on the inner step during the process of deforming the metal ring by the first clamping assembly,

[0018] The cavity cover is allowed to move in the radial direction to press the outer edge of the cavity cover towards the outer cylinder by the second clamping assembly outside the first clamping assembly after the metal ring contacts the inner cylinder and the cavity cover on the second outer step.

[0019] The tool according to the embodiment of the present disclosure arranges the metal ring on the second outer step of the coaxial resonant cavity and between the central hole of the inner cylinder and the cavity cover, and the metal ring at least partially extends out of the cavity cover. The metal ring is deformed by the clamp to contact the inner cylinder on the inner side of the metal ring and contact the cavity cover on the outer side of the metal ring, so as to encapsulate the containing cavity between the outer cylinder and the inner cylinder, realize good electrical connection between the cavity and the cavity cover, and ensure the consistency of the characteristics (resonant frequency and Q value) of the coaxial resonant cavity before and after brazing. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and other objects, features and advantages of the present disclosure will become more apparent from the following description of 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 perspective view of a cavity cover in the related art is schematically shown;

[0023] Figure 3 A cross-sectional view of a cavity cover in the related art is schematically shown; Figure 2 A cross-sectional view of a cavity cover in the related art is schematically shown;

[0024] Figure 4 A perspective view of a cavity in the related art is schematically shown;

[0025] Figure 5 A cross-sectional view of a cavity in the related art is schematically shown; Figure 4 A cross-sectional view of a cavity in the related art is schematically shown;

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

[0027] Figure 7 A cross-sectional view of a tool and a coaxial resonant cavity according to an embodiment of the present disclosure is schematically shown;

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

[0029] Figure 9 A perspective view of a cavity according to an embodiment of the present disclosure is schematically shown; Figure 8 A cross-sectional view of the cavity along a radial direction is schematically shown;

[0030] Figure 10 A perspective view of a cavity cover according to an embodiment of the present disclosure is schematically shown;

[0031] Figure 11 A perspective view of a cavity cover according to an embodiment of the present disclosure is schematically shown; Figure 10 A cross-sectional view of the cavity cover along a radial direction is schematically shown;

[0032] Figure 12 A cross-sectional view of a metal ring in a first state according to an embodiment of the present disclosure is schematically shown;

[0033] Figure 13 A cross-sectional view of a metal ring in a second state according to an embodiment of the present disclosure is schematically shown; Figure 12 A partial enlarged view of part A is schematically shown;

[0034] Figure 14 A cross-sectional view of a metal ring in a second state according to an embodiment of the present disclosure is schematically shown;

[0035] Figure 15 A partial enlarged view of part B is schematically shown; and Figure 14 A partial enlarged view of part B is schematically shown; and

[0036] Figure 16 A flowchart of a packaging method of a coaxial resonant cavity according to an embodiment of the present disclosure is schematically shown.

[0037] Reference signs are explained as follows:

[0038] 1 - coaxial resonant cavity;

[0039] 11 - cavity;

[0040] 111 - outer cylinder;

[0041] 1111 - inner step portion;

[0042] 112 - inner cylinder;

[0043] 113 - second outer step portion

[0044] 114 - first through hole;

[0045] 115 - first outer step portion;

[0046] 12 - cavity cover;

[0047] 121 - central hole;

[0048] 122 - inner annular surface;

[0049] 123 - outer annular surface;

[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 - fastener;

[0057] 2213 - compression ring;

[0058] 222 - second clamping assembly;

[0059] 2221 - clamping ring;

[0060] 2222 - locking unit;

[0061] 2223 - second rod;

[0062] 2224 - locking member;

[0063] 3 - cavity;

[0064] 31 - outer cylindrical body;

[0065] 311 - inner step portion;

[0066] 32 - central column;

[0067] 321 - inner cylindrical body;

[0068] 322 - outer step portion;

[0069] 4 - cavity cover;

[0070] 41 - central hole;

[0071] 42 - reentrant drift head;

[0072] 43 - inner annular surface;

[0073] 44 - outer lateral annulus. DETAILED DESCRIPTION

[0074] For the purposes of the present disclosure, technical solutions and advantages, the following will be further described in detail with specific embodiments and with reference to the accompanying drawings.

[0075] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used herein, the term "includes" and tautological expressions thereof, such as "including," "includes," "include," "contains," "containing," and so forth, mean "comprising."

[0076] All terms used herein, including technical and scientific terms, have the meanings commonly understood by one of ordinary skill in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted as having a meaning that is consistent with the context of the specification, and should not be interpreted in an idealized or overly formal way.

[0077] In the case of using expressions similar to "at least one of A, B, and C, etc.", it should generally be interpreted to include any of them, e.g., to include only A, only B, only C, both A and B, both A and C, both B and C, and / or both A and B and C, etc. In the case of using expressions similar to "at least one of A, B, or C, etc.", it should generally be interpreted to include any of them, e.g., to include only A, only B, only C, both A and B, both A and C, both B and C, and / or both A and B and C, etc.

[0078] It is also to be noted that the directional phrases mentioned in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., are only the directions of the drawings, and are not intended to limit the protection scope of the present disclosure. Throughout the drawings, the same elements are represented by the same or similar reference numerals. When it is possible to cause confusion in understanding the present disclosure, the conventional structures or configurations will be omitted.

[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, as Figure 1As shown, the coaxial resonant cavity generally comprises a cavity body 3 and a cavity cover 4. The cavity body 3 comprises an outer cylinder 31 and a center column 32. The center column 32 comprises an inner cylinder 321 and an outer step portion 322 formed on the upper outer wall of the inner cylinder 321. The inner cylinder 321 is formed upwardly from the bottom center of the outer cylinder 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 31, and the center hole 41 of the cavity cover 4 passes through the inner cylinder 321, so that the outer edge of the cavity cover 4 is supported on the inner step portion 311.

[0081] Figure 2 A perspective view of the cavity cover in the related art is schematically shown, Figure 3 A perspective view of the cavity cover is schematically shown, Figure 2 A cross-sectional view of the cavity cover in the radial direction is schematically shown.

[0082] As Figures 1 to 3 As shown, the cavity cover 4 of the coaxial resonant cavity is provided with an annular reentrant drift head 42, which causes the inner side annular surface 43 of the cavity cover 4 inside the reentrant drift head 42 and the outer side annular surface 44 outside the reentrant drift head 42 to be unable to be machined at one time, and only one side annular surface can be machined first. After the size is machined in place, the lathe tool of the lathe needs to be recalibrated, and the annular surface on the other side is machined. At present, the machining of the machining lathe generally has a certain machining precision (for example, 0.02 mm), which causes the inner side annular surface 43 and the outer side annular surface 44 to be unable to be located on the same horizontal plane. Figure 3 As shown, the distance D1 between the outer side annular surface 44 and the outer surface of the cavity cover 4 is not equal to the distance D2 between the inner side annular surface 43 and the outer surface of the cavity cover 4 (D1≠D2).

[0083] Figure 4 A perspective view of the cavity body in the related art is schematically shown, Figure 5 A perspective view of the cavity body is schematically shown, Figure 4 A cross-sectional view of the cavity body in the radial direction is schematically shown.

[0084] As Figure 1 , Figure 4 and Figure 5 As shown, the cavity body 3 of the coaxial resonant cavity also has two positioning connecting surfaces (that is, the upper surfaces of the inner step portion 311 and the outer step portion 322), but there is no structure to block the translation of the lathe tool between the two positioning surfaces. Therefore, the two positioning surfaces can be machined at one time, so that the two positioning connecting surfaces on the cavity body can be guaranteed to be on the same horizontal plane.

[0085] Due to the cavity cover 4 with the reentrant drift head 42, the inner annular surface 43 and the outer annular surface 44 cannot be in the same horizontal plane during machining, resulting in two positioning connecting surfaces not in the same horizontal plane after the cavity 3 and the cavity cover 4 are assembled. When the cavity 3 and the cavity cover 4 are fixed by the clamp, only one of the positioning connecting surfaces can be tightly connected to form good electrical contact.

[0086] For example, in the cylindrical coaxial resonant cavity shown in the figure, the upper surface of the inner stepped portion 311 of the cavity 3 and the outer annular surface 44 of the cavity cover 4 are selected to be in close contact, and good electrical contact is formed after being fixed by the clamp. Figure 1

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

[0088] The concentric circle line with an arrow represents the magnetic field density and strength. As shown in the figure, the magnetic field of the coaxial resonant cavity is concentrated between the central column 32 and the outer cylinder 31 of the coaxial resonant cavity. Therefore, if good electrical connection between the cavity 3 and the cavity cover 4 cannot be achieved during cold measurement before brazing of the coaxial resonant cavity, the microwave magnetic field will be radiated out of the coaxial resonant cavity through the gap (for example, the gap between the upper surface of the outer stepped portion and the inner annular surface of the cavity cover), thereby causing the fundamental mode resonance frequency of the coaxial resonant cavity to be different from the resonance frequency and Q value of the closed coaxial resonant cavity. Figure 6 Figure 6 After the coaxial resonant cavity is brazed, the electrical connection 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 good gapless connection, and the microwave magnetic field signal will not be radiated out of the cavity. At this time, the cold measurement of the resonant cavity characteristics, the fundamental mode resonance frequency of the coaxial resonant cavity is the resonance frequency of the closed cavity. Figure 1 From the above cold measurement process and analysis, it can be seen that the inconsistent magnetic field distribution of the microwave signal in the coaxial resonant cavity during the two cold measurements is the main reason for the inconsistent characteristics (resonance frequency and Q value) of the resonant cavity before and after brazing.

[0089] Therefore, when designing the structure of the cavity and the cavity cover of the coaxial resonant cavity and machining the parts, the surfaces of the cavity and the cavity cover connected by brazing should be ensured to achieve good gapless contact. If the positioning connecting surfaces of the cavity and the cavity cover are gapless, good electrical connection between the cavity and the cavity cover can be achieved by fixing the two clamps as a clamp during cold measurement.

[0090]

[0091] Therefore, when designing the structure of the cavity and the cavity cover of the coaxial resonant cavity and machining the parts, the surfaces of the cavity and the cavity cover connected by brazing should be ensured to achieve good gapless contact. If the positioning connecting surfaces of the cavity and the cavity cover are gapless, good electrical connection between the cavity and the cavity cover can be achieved by fixing the two clamps as a clamp during cold measurement.

[0092] ​​The function of the cold measurement fixture is mainly to ensure that the cavity and the cavity cover of the coaxial resonant cavity are tightly connected through the positioning surface, maintain good electrical contact, and can be repeatedly disassembled and deformed. Because the cavity and the cavity cover fixed by the fixture can be repeatedly disassembled, the coaxial resonant cavity characteristics can be tested in this state, and the cavity and the cavity cover sizes can be corrected according to the test data. When the sizes of the cavity and the cavity cover are corrected, the characteristics meet the design requirements, and the cavity and the cavity cover can be connected by brazing to achieve airtightness and good electrical contact. Because the 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 measurement fixture and method to ensure that the characteristics of the resonant cavity before and after brazing are consistent.

[0093] In the related art, the upper surface of the inner step and the outer side surface are easy to achieve good electrical contact without gaps, and the solder filling side gap after brazing will not change the electrical connection state. The upper surface of the outer step part at the center column and the inner side surface of the cavity cover need to be deformed to contact the upper surface of the outer step part by applying a large force. The same operation is also required when brazing, and the fastening nut cannot be loosened due to thermal expansion and contraction at high temperature, so as to realize the consistency of the resonant cavity before and after brazing.

[0094] However, in actual operation, especially at high temperature, the cavity cover deformed by strong pressure will release a lot of stress to the fastening nut, causing the characteristics of the brazed resonant cavity to change. 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 is impossible to adjust it by changing the volume of the cavity. This situation hinders the application and development of the coaxial resonant cavity in the klystron.

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

[0096] As one aspect of an embodiment of the present disclosure, as Figure 7As shown, a tooling 2 is provided, suitable for forming a seamless contact between the cavity 11 and the cavity cover 12 of a coaxial resonant cavity 1. The cavity 11 includes an outer cylinder 111 and an inner cylinder 112. The inner cylinder 112 extends upward from the center of the bottom of the outer cylinder 111 and has an axially extending first through hole 114. A first outer step portion 115 is formed on the upper outer wall of the inner cylinder 112, and a second outer step portion 113 is formed on the first outer step portion 115. An inner step portion 1111 is formed on the upper inner wall of the outer cylinder 111. The central 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 tooling 2 includes a metal ring 21 and a clamp 22. The metal ring 21 is disposed on the second outer step portion 113, located between the inner cylinder 112 and the central hole 121 of the cavity cover 12, and at least partially extends out of the cavity cover 12. The clamp 22 is used to clamp the bottom of the outer cylinder 111 and the cavity cover 12, and to compress the metal ring 21 to cause deformation, so that the metal ring 21 contacts the inner cylinder 112 and the cavity cover 12 on the second outer step portion 113 respectively, so as to use the cavity cover 12 to enclose the receiving cavity between the outer cylinder 111 and the inner cylinder 112.

[0097] According to the tooling 2 of this embodiment, a metal ring 21 is placed on the second outer step portion 113 of the coaxial resonant cavity 1 and located between the center hole 121 of the inner cylinder 112 and the cavity cover 12, and extends at least partially out of the cavity cover 12. The metal ring 21 is 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. The cavity cover 12 is used to enclose the receiving cavity between the outer cylinder 111 and the inner cylinder 112, so as to achieve a good electrical connection between the cavity 11 and the cavity cover 12, and ensure that the characteristics (resonant frequency and Q value) of the coaxial resonant cavity 1 are consistent before and after brazing.

[0098] Figure 8 A perspective view of a cavity according to an embodiment of the present disclosure is schematically shown. Figure 9 Schematic illustration Figure 8 The diagram shows a cross-sectional view of the cavity along the radial direction.

[0099] like Figure 1 , Figure 8 and Figure 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 the central pillar of the coaxial resonant cavity 1.

[0100] A re-entry drift head 13 is formed on the outer cylinder 111 and is coaxial with the outer cylinder 111. The re-entry drift head 13 has one or more inwardly curved portions, forming 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] Figure 10 Fig. 2 schematically shows a perspective view of a cavity cover according to an embodiment of the present disclosure, Figure 11 Fig. 3 schematically shows a cross-sectional view of the cavity cover, Figure 10 Fig. 4 schematically shows a cross-sectional view of the cavity cover along a radial direction.

[0102] As shown in Fig. 1, Figure 10 and Fig. 2, Figure 11 a reentrant drift head 13 coaxial with the outer cylinder 111 is formed on the cavity cover 12.

[0103] In an illustrative embodiment, as shown in Fig. 3, Figure 7 Fig. 4, Figure 10 and Fig. 5, Figure 11 a lower surface of the cavity cover 12 is divided into an outer annular surface 123 outside the reentrant drift head 13 and an inner annular surface 122 inside the reentrant drift head 13. A first distance (D1) between the outer annular surface 123 and an upper surface of the cavity cover 12 is greater than or equal to a second distance (D2) between the inner annular surface 122 and the upper surface of the cavity cover 12.

[0104] According to an embodiment of the present disclosure, as shown in Fig. 6, Figure 7 the clamp 22 comprises a first clamping component 221 and a second clamping component 222. The first clamping component 221 passes through the central hole 121 and is adapted to press the metal ring 21 and the inner edge of the cavity cover 12 towards the inner cylinder 112. The second clamping component 222 is configured to press the outer edge of the cavity cover 12 towards the outer cylinder 111 at the periphery of the first clamping component 221.

[0105] In such an embodiment, by pressing the metal ring 21 and the inner edge of the cavity cover 12 towards the inner cylinder 112 through the first clamping component 221, and pressing the outer edge of the cavity cover 12 towards the outer cylinder 111 at the periphery of the first clamping component 221 through the second clamping component 222, the metal ring 21, the cavity cover 12 and the cavity 11 are in close contact, thereby achieving good electrical contact, effectively eliminating the gap between the cavity 11 and the cavity cover 12, preventing the leakage of microwave signals from the gap, and thus ensuring the resonance characteristics and Q value of the resonant cavity.

[0106] Figure 12 Fig. 7 schematically shows a cross-sectional view of a metal ring in a first state according to an embodiment of the present disclosure, Figure 13 Fig. 8 schematically shows a cross-sectional view of the metal ring, Figure 12 Fig. 9 schematically shows a partial enlarged view of part A, Figure 14 Fig. 10 schematically shows a cross-sectional view of a metal ring in a second state according to an embodiment of the present disclosure, Figure 15 Fig. 11 schematically shows a cross-sectional view of the metal ring, Figure 14 Fig. 12 schematically shows a partial enlarged view of part B.

[0107] According to an embodiment of the present disclosure, as shown in Fig. 13, 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 screwed into both ends of the first rod 2211 and 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, from a circular shape to an elliptical shape as shown in a first state Figure 12 and Figure 13 to a second state as shown in Figure 14 and Figure 15 , the cross-sectional shape of the metal ring 21 in the radial direction changes from a circle to an ellipse, achieving uniform pressure and deformation control of the metal ring 21, thereby ensuring good contact between the metal ring 21 and the cavity 11 and the cavity cover 12, improving test efficiency and accuracy, and facilitating repeated use.

[0108] In an illustrative embodiment, the fasteners 2212 can be nuts.

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

[0110] According to embodiments of the present disclosure, as shown in Figure 7 , the first clamping assembly 221 further includes a compression ring 2213, which is sleeved around the second outer step portion 113 of the inner cylinder 112 and abuts between the metal ring 21 and the fasteners 2212 to press the metal ring 21 under the action of the fasteners 2212.

[0111] In such embodiments, the compression ring 2213 is located between the metal ring 21 and the fasteners 2212, which can disperse the direct pressure of the fasteners 2212 on the metal ring 21, avoiding deformation or damage of the metal ring 21 due to excessive local pressure.

[0112] It can be understood that the compression ring 2213 can be provided separately or integrally with the fasteners 2212.

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

[0114] In such an embodiment, the cavity cover 12 can be firmly fixed on the inner step portion 1111 by clamping the two clamping rings 2221 with the locking unit 2222, so as to prevent displacement or deformation of the cavity cover 12 during the test, and ensure the accuracy of the test results. The design of the two clamping rings 2221 and the locking unit 2222 allows repeated disassembly, facilitating cold measurement and debugging of the coaxial resonant cavity 1, and size correction according to the test results.

[0115] According to an embodiment of the present disclosure, as shown in Figure 7 the outer diameter of the two clamping rings 2221 is greater than the outer diameter of the inner cylinder 112, and a plurality of fourth through holes are formed on the periphery of the outer cylinder 111. The locking unit 2222 includes a plurality of second rod members 2223 and a plurality of locking members 2224. Each second rod member 2223 respectively passes through the opposite fourth through holes on the two clamping plates, and extends out from the two ends of the two fourth through holes. Each two locking members 2224 are threadedly combined with the two ends of a second rod member 2223, so as to clamp the outer cylinder 111 and the cavity cover 12 between the two clamping rings 2221 by tightening the locking members 2224.

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

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

[0118] According to an embodiment of the present disclosure, the 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 material of the metal ring 21 is Agcu72. Agcu72 is a soft alloy with certain elasticity and toughness, which is easily deformed and not broken under very small pressure. It can be understood that the metal ring 21 can also be replaced by other soft, elastic and tough metal rings, as long as it can be in good contact with the cavity 11 and the cavity cover 12 after being deformed by pressure.

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

[0122] Further, the second clamping assembly 222 is used to limit the cavity cover 12 of the coaxial resonant cavity 1 on the inner step, and the first clamping assembly 221 is used to press the metal ring 21 and the inner edge of the cavity cover 12 through the center hole 121 of the coaxial resonant cavity 1 towards the inner cylinder 112, so as to compress the metal ring 21 to generate deformation, so that the cross section of the metal ring 21 in the radial direction is compressed from a circular shape to an elliptical shape. As shown in Figure 14 and Figure 15 illustrated, the metal ring 21 can be in contact with the inner cylinder 112 on the inner side of the second outer step portion 113 and in contact with the cavity cover 12 on the outer side, so as to achieve good electrical contact between the cavity cover 12 and the cavity 11.

[0123] Figure 16 A flowchart of a packaging method of a coaxial resonant cavity according to an embodiment of the present disclosure is schematically shown.

[0124] As another aspect of the embodiment of the present disclosure, a packaging method of a coaxial resonant cavity 1 is provided, which adopts any one of the above-mentioned toolings 2. As shown in Figure 16 the packaging method includes operations S1610 to S1630.

[0125] In operation S1610, the second clamping assembly is used to limit the cavity cover of the coaxial resonant cavity on the inner step portion.

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

[0127] In operation S1630, the first clamping assembly is used to press the metal ring and the inner edge of the cavity cover through the center hole of the coaxial resonant cavity towards the inner cylinder, so as to compress the metal ring to generate deformation, so that the metal ring is in contact with the inner cylinder and the cavity cover on the second outer step portion, respectively, to package the containing cavity between the outer cylinder and the inner cylinder by the cavity cover.

[0128] According to the packaging method of the embodiment of the present disclosure, the first clamping assembly 221 is used to press the inner edge of the metal ring 21 and the cavity cover 12 and compress the metal ring 21 to generate deformation, so that the metal ring 21 is in contact with the inner cylinder 112 and the cavity cover 12 on the second outer step portion 113, respectively, to achieve good electrical contact and ensure the transmission efficiency of the microwave signal. Moreover, the packaging method allows the tooling 2 and the coaxial resonant cavity 1 to be repeatedly disassembled and assembled, which facilitates the maintenance and replacement of the coaxial resonant cavity 1.

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

[0130] According to the embodiment of the present disclosure, the cavity cover 12 of the coaxial resonant cavity 1 is limited on the inner step by the second clamping assembly 222, and in the process of deforming the metal ring 21 by the first clamping assembly 221, the cavity cover 12 is allowed to move in the radial direction, so that the outer edge of the cavity cover 12 is pressed towards the outer cylinder 111 by the second clamping assembly 222 outside the first clamping assembly 221 after the metal ring 21 contacts the inner cylinder 112 and the cavity cover 12 on the second outer step part 113, respectively.

[0131] Since there may be a certain size error in the processing of the cavity cover 12 and the inner cylinder 112, the cavity cover 12 of the coaxial resonant cavity 1 is limited on the inner step by the second clamping assembly 222, and in the process of deforming the metal ring 21 by the first clamping assembly 221, the cavity cover 12 is allowed to move in the radial direction, so that the metal ring 21 has a certain radial deformation space in the deformation process, the metal ring 21 deforms more uniformly, and the contact area between the metal ring 21 and the inner cylinder 112 and the cavity cover 12 is improved.

[0132] In an exemplary embodiment, after the first cold test is completed and the data is recorded by using the packaging method described above, the cavity 11 and the cavity cover 12 of the coaxial resonant cavity 1 are clamped before brazing. When clamping, the outer edge of the cavity cover 12 is limited on 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 part 113. The metal ring 21 placed on the second outer step part 113 is tapped and knocked to deform the metal ring 21 to tightly contact and firmly contact the inner cylinder 112 and the cavity cover 12. At this time, the coaxial resonant cavity 1 is tested for the second time, and if the characteristics of the coaxial resonant cavity 1 are consistent with the first cold test characteristics, the clamping is completed. If they are not consistent, the metal ring 21 can be tapped and knocked 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 the clamping is completed, the solder is placed on the metal ring 21 and the outer periphery of the brazing joint surface, and when the high-temperature welding is performed, the solder melts to form a gas-tight and good electrical contact between the cavity 11 and the cavity cover 12. Finally, the characteristics of the coaxial resonant cavity 1 after brazing are tested.

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

[0135] The above describes embodiments of the present disclosure. However, these embodiments are merely for illustrative purposes, and are not intended to limit the scope of the present disclosure. Although each embodiment is described above separately, this does not mean that the measures in each embodiment cannot be used advantageously in combination. The scope of the present disclosure is defined by the appended claims and their equivalents. Those skilled in the art can make various substitutions and modifications without departing from the scope of the present disclosure, and these substitutions and modifications should all fall within the scope of the present disclosure.

Claims

1. A tooling apparatus characterized by, The present application relates to a method for sealing a coaxial resonant cavity. The cavity comprises: an outer cylinder; and an inner cylinder formed from the bottom center of the outer cylinder and extending upward, and provided with an axially extending first through hole; wherein a first outer step is formed on the upper outer wall of the inner cylinder, a second outer step is formed on the first outer step, an inner step 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 so that the outer edge of the cavity cover is supported on the inner step; The tool comprises: a metal ring arranged on the second outer step, between the inner cylinder and the central hole of the cavity cover, and at least partially protruding from the cavity cover; and a clamp adapted to clamp the bottom of the outer cylinder and the cavity cover, and to compress the metal ring to cause deformation of the metal ring, so that the metal ring is in contact with the inner cylinder and the cavity cover on the second outer step, respectively, to encapsulate the containing cavity between the outer cylinder and the inner cylinder with the cavity cover.

2. The tooling of claim 1, wherein, The clamp comprises: a first clamping assembly passing through the central hole and adapted to compress the metal ring and the inner edge of the cavity cover towards the inner cylinder; and a second clamping assembly configured to compress the outer edge of the cavity cover towards the outer cylinder at the periphery of the first clamping assembly.

3. The tooling of claim 2, wherein, The first clamping assembly comprises: a first rod passing through the first through hole and protruding from both ends of the first through hole; and two fasteners threadedly coupled to the two ends of the first rod, respectively, and abutting against the center of the bottom wall of the outer cylinder and the metal ring, respectively, to cause the deformation of the metal ring by tightening the fasteners.

4. The tooling of claim 3, wherein, The first clamping assembly further comprises: a compression ring sleeved on the periphery of the second outer step of the inner cylinder and abutting between the metal ring and the fasteners, to compress the metal ring under the action of the fasteners.

5. The tooling of any one of claims 2-4, wherein, The cavity cover and the outer cylinder are respectively provided with a reentrant drift head coaxial with the outer cylinder, and the second clamping assembly comprises: two clamping rings, each arranged at the periphery of a third through hole on the reentrant drift head; and a locking unit clamping the two clamping rings so that the cavity cover is arranged on the inner step.

6. The tooling of claim 5, wherein, The outer diameters of the two clamping rings are greater than the outer diameter of the inner cylinder, and a plurality of fourth through holes are formed at the periphery of the outer cylinder in opposition; The locking unit comprises: a plurality of second rods, each passing through the opposing fourth through holes on the two clamping rings and protruding from the two ends of the fourth through holes away from each other; and a plurality of locking members, each threadedly coupled to the two ends of one second rod, to clamp the outer cylinder and the cavity cover between the two clamping rings by tightening the locking members.

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

8. The tooling of claim 1 wherein, The material of the metal ring includes silver-copper alloy.

9. A method of packaging a coaxial resonator, characterized by, The encapsulation method comprises: using the second clamping assembly to limit the cavity cover of the coaxial resonant cavity on the inner step. The metal ring is placed between the central hole of the inner cylinder and the cavity cover and on the second outer step; By using the first clamping assembly, the metal ring and the inner edge of the cavity cover are pressed towards the inner cylinder through the central hole of the coaxial resonant cavity, the metal ring is deformed, and the metal ring is in contact with the inner cylinder and the cavity cover on the second outer step respectively, so as to encapsulate the containing cavity between the outer cylinder and the inner cylinder by the cavity cover.

10. The packaging method according to claim 9, wherein, By using the second clamping assembly, the cavity cover of the coaxial resonant cavity is limited on the inner step, and in the process of deforming the metal ring by using the first clamping assembly, The cavity cover is allowed to move in the radial direction, so that the outer edge of the cavity cover is pressed towards the outer cylinder by using the second clamping assembly on the periphery of the first clamping assembly again after the metal ring is in contact with the inner cylinder and the cavity cover on the second outer step respectively.

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