A radio frequency connector with strong electromagnetic pulse protection capability

Abstract

This invention discloses a radio frequency (RF) connector with strong electromagnetic pulse (EMP) protection capability, specifically relating to the field of RF connection technology. It includes a connector main housing with a conductive inner core inside. A coaxial gas discharge tube is disposed outside the conductive inner core. The coaxial gas discharge tube includes an inner conductive electrode and an outer conductive electrode, which are coaxial in structure. The inner conductive electrode is fixedly mounted outside the conductive inner core, and the space formed by the inner and outer conductive electrodes is filled with inert gas. This invention integrates the coaxial gas discharge tube into the connector main housing to form an RF connector with strong EMP protection capability. This RF connector is then used in the circuit connection of an RF antenna, providing a protection solution that can be directly integrated inside the RF connector without increasing space occupation or system connection nodes, while still providing strong EMP protection.

Description

Technical Field

[0001] This invention relates to the field of radio frequency connection technology, and more specifically, to a radio frequency connector with strong electromagnetic pulse protection capability. Background Technology

[0002] Radio frequency (RF) antennas, as key components for reconnaissance and communication, are widely used in high-frequency communication fields such as communication base stations, satellite communications, and radar. In practical applications, RF antennas are susceptible to strong electromagnetic pulses such as lightning and nuclear electromagnetic pulses. These overvoltages can cause signal distortion within the antenna system, equipment damage, and even system failure. Currently, a common protection measure is to connect an external protection module in series with the RF circuitry; however, these solutions have the following problems:

[0003] External protection modules increase system complexity and wiring difficulty, occupy extra space, and are not conducive to device miniaturization. Moreover, the external protection modules add extra connection nodes between the external protection modules and the communication system, which will introduce signal loss and reflection, affecting the transmission quality of radio frequency signals. Summary of the Invention

[0004] The present invention provides an RF connector with strong electromagnetic pulse protection capability. The problem to be solved is that the existing external protection modules for RF antennas increase system complexity and wiring difficulty, occupy extra space, and are not conducive to device miniaturization. Moreover, the external protection module adds an extra connection node between the external protection module and the communication system, which introduces signal loss and reflection, affecting the transmission quality of RF signals.

[0005] To address the aforementioned issues, this invention provides a protection solution that can be directly integrated into the interior of an RF connector, without increasing space or system connection nodes, while providing strong electromagnetic protection capabilities. The specific solution is as follows: An RF connector with strong electromagnetic pulse protection capabilities, comprising a connector main housing, a conductive inner core disposed inside the connector main housing, a coaxial gas discharge tube disposed outside the conductive inner core, and an outer insulating bushing and an inner insulating bushing disposed at both ends of the coaxial gas discharge tube;

[0006] The coaxial gas discharge tube includes an inner conductive electrode and an outer conductive electrode. The inner and outer conductive electrodes are coaxial in structure. The inner conductive electrode is fixedly installed on the outside of the conductive inner core. The space formed by the inner and outer conductive electrodes is filled with inert gas.

[0007] A thermal expansion restraint ring is provided in the main housing of the connector at the position corresponding to the external conductive electrode. The area between the thermal expansion restraint ring and the external conductive electrode is a welding groove. The thermal expansion coefficient of the thermal expansion restraint ring is higher than that of the external conductive electrode. The external conductive electrode and the main housing of the connector are fixed by welding at the welding groove.

[0008] In a preferred embodiment, the two ends of the inner conductive electrode and the outer conductive electrode are fixedly connected by a set of insulating isolation sheets, and a protruding discharge electrode is provided between the inner conductive electrode and the outer conductive electrode.

[0009] In a preferred embodiment, the thermal expansion restraint ring is a split restraint ring with a thin-walled circular structure. The outer wall of the split restraint ring has a reserved space for movement between it and the main housing of the connector. The end of the split restraint ring near the middle of the main housing of the connector slides in contact with the main housing of the connector.

[0010] In a preferred embodiment, the RF connector further includes a pressure support assembly. During soldering, the split-type retaining ring is used in conjunction with the pressure support assembly, which applies axial pressure to the split-type retaining ring.

[0011] In a preferred embodiment, the split-type restraint ring has a drum-shaped structure, that is, the waist of the split-type restraint ring protrudes outward. The counter-pressure support assembly includes an external fixing structure and a thermal expansion block structure. The external fixing structure is fixedly installed on the outside of the connector main housing during welding. The thermal expansion block structure is fixedly installed on the external fixing structure and fits against the end of the split-type restraint ring. When the thermal expansion block structure undergoes thermal expansion, it forms an axial compression on the split-type restraint ring.

[0012] In a preferred embodiment, the thermal expansion block structure includes a fixed cylinder and a movable cylinder. The fixed cylinder is fixedly connected to an external fixed structure, and the movable cylinder is slidably disposed on the fixed cylinder and contacts a split-type restraint ring. Gas is filled between the fixed cylinder and the movable cylinder, and a sealing structure is provided between the fixed cylinder and the movable cylinder.

[0013] In a preferred embodiment, the thermal expansion restraint ring is an integral restraint ring, which is integrally structured with the connector main housing. The integral restraint ring is a thin-walled ring structure, and its thickness gradually decreases in the direction away from the connector main housing. A space for movement is reserved between the outer wall of the integral restraint ring and the connector main housing.

[0014] In a preferred embodiment, a piston pressure plate is slidably installed inside the connector main housing. An inner conical sleeve is fixedly connected to the area of ​​the piston pressure plate corresponding to the outer wall of the integrated restraint ring. The inner wall of the inner conical sleeve is a conical inner wall. A piston space is formed between the side of the piston pressure plate corresponding to the integrated restraint ring and the connector main housing. A sealing structure is provided between the piston pressure plate and the connector main housing. An air hole is provided in the piston pressure plate, and a sealing plug is provided in the air hole.

[0015] In a preferred embodiment, the outer wall of the external conductive electrode is provided with multiple sets of inclined grooves, which are gradually inclined toward the middle of the connector main housing in the direction from the outside to the inside.

[0016] In a preferred embodiment, the insulating spacer has a protrusion extending into the region between the inner conductive electrode and the outer conductive electrode. The protrusion has a straight-walled groove. A through-slit is provided between the outer conductive electrode and the insulating spacer for the solder to enter. An inclined-walled groove is provided at the position of the outer conductive electrode corresponding to the straight-walled groove. The inner wall of the inclined-walled groove has a conical structure. The outer conductive electrode and the insulating spacer are connected by welding. After the solder between the inclined-walled groove and the straight-walled groove solidifies, it forms a snap-fit ​​structure.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. The electromagnetic pulse protection solution of the present invention can achieve a high degree of integration: it combines the function of gas discharge tube with the internal medium of radio frequency connector, replacing part of the insulating medium material, eliminating the need for additional external protection modules, reducing the connection nodes caused by external cascading, simplifying the protection system structure, reducing the size of the equipment, improving the integration, and making it suitable for application scenarios with strict space requirements.

[0019] 2. The electromagnetic pulse protection scheme of the present invention can achieve low signal loss: by optimizing the size of the coaxial gas discharge tube and the electrode structure, the transmission loss of the radio frequency signal of the strong electromagnetic pulse protection RF connector is extremely low during normal operation, which can meet the transmission requirements of high-speed radio frequency signals.

[0020] 3. The electromagnetic pulse protection scheme of the present invention can achieve fast response and high-efficiency protection: it can achieve nanosecond-level fast response, strong current carrying capacity, and can effectively discharge transient overcurrents of up to tens of kiloamperes, providing reliable strong electromagnetic pulse protection for radio frequency systems. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the composition of the radio frequency connector in Embodiment 1 of the present invention.

[0022] Figure 2 This is a cross-sectional view of the radio frequency connector in Embodiment 1 of the present invention.

[0023] Figure 3 This is an external view of the radio frequency connector in Embodiment 1 of the present invention.

[0024] Figure 4 This is a schematic diagram of the coaxial gas discharge tube in Embodiment 1 of the present invention.

[0025] Figure 5 This is a schematic diagram of the structure after a thermal expansion restraint ring is set in the main housing of the connector in Embodiment 1 of the present invention.

[0026] Figure 6 This is a diagram showing the state of the welding groove filled with solder (not melted) when using a split-type restraint ring in Embodiment 2 of the present invention.

[0027] Figure 7 This is a diagram showing the state of the solder melting and the split binding ring expanding outwards when heated during the second embodiment of the present invention.

[0028] Figure 8 This is a diagram showing the state of the solder solidifying and the split binding ring shrinking inward during cooling in Embodiment 2 of the present invention.

[0029] Figure 9 This is a diagram illustrating the effective cooperation between the counter-pressure support assembly and the split-type restraint ring in Embodiment 3 of the present invention.

[0030] Figure 10 This is a state diagram of the drum-shaped split binding ring used in conjunction with a thermal expansion pressure block structure in Embodiment 4 of the present invention.

[0031] Figure 11 This is a schematic diagram of the gas expansion thermal expansion block structure in Embodiment 5 of the present invention.

[0032] Figure 12 This is a schematic diagram of the integrated restraint ring used in Embodiment Six of the present invention.

[0033] Figure 13 This is a schematic diagram of the process from the melting of the solder to its solidification during the welding process in Embodiment Six of the present invention.

[0034] Figure 14 This is a state diagram showing the use of a piston-type pressure plate and an integrated restraint ring in Embodiment 7 of the present invention.

[0035] Figure 15 This is a schematic diagram of the piston pressure plate and the integrated restraint ring forming a compression state when the temperature drops after welding in Embodiment 7 of the present invention.

[0036] Figure 16 This is a schematic diagram of the structure after the inner insulating bushing is installed following the welding technique in Embodiment 7 of the present invention.

[0037] Figure 17 This is a schematic diagram illustrating the interaction between the inclined groove on the outer wall of the external conductive electrode and the solder in Embodiment 8 of the present invention.

[0038] Figure 18 This is a schematic diagram of the improved coaxial gas discharge tube according to the present invention.

[0039] In the diagram: 1. Connector main housing; 11. Welding groove; 12. Plug end locking cap; 13. Locking cap retainer ring; 2. Conductive inner core; 3. Coaxial gas discharge tube; 31. Inner conductive electrode; 32. Outer conductive electrode; 321. Angled groove; 322. Angled wall groove; 33. Insulating isolation sheet; 331. Straight wall groove; 34. Discharge electrode; 4. Outer insulating bushing; 5. Inner insulating bushing; 6. Thermal expansion restraint ring; 61. Split restraint ring; 62. Integrated restraint ring; 7. Counterpressure support assembly; 71. External fixing structure; 72. Thermal expansion pressure block structure; 721. Fixed cylinder; 722. Movable cylinder; 73. Piston pressure plate; 731. Inner conical sleeve; 732. Sealing plug. Detailed Implementation

[0040] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0041] Example 1, refer to Appendix 1 to the instruction manual Figure 4 A radio frequency connector with strong electromagnetic pulse protection capability includes a connector main housing 1. The main housing 1 has a conductive inner core 2 (for the radio frequency connector, the conductive inner core 2 is the inner conductor, and the main housing 1 is the outer conductor). The conductive inner core 2 has a coaxial gas discharge tube 3 outside. The two ends of the coaxial gas discharge tube 3 are respectively provided with an outer insulating bushing 4 and an inner insulating bushing 5. Both the outer insulating bushing 4 and the inner insulating bushing 5 are installed inside the main housing 1.

[0042] The coaxial gas discharge tube 3 includes an inner conductive electrode 31 and an outer conductive electrode 32. Both the inner conductive electrode 31 and the outer conductive electrode 32 are cylindrical structures and are coaxial. The inner conductive electrode 31 is fixedly installed on the outside of the conductive inner core 2. The two ends of the inner conductive electrode 31 and the outer conductive electrode 32 are respectively fixedly connected by a set of insulating isolation sheets 33. The space formed by the inner conductive electrode 31 and the outer conductive electrode 32 is filled with an inert gas (hydrogen can also be used). A protruding discharge electrode 34 is provided between the inner conductive electrode 31 and the outer conductive electrode 32.

[0043] The inner conductive electrode 31 is directly sleeved on the outside of the conductive inner core 2. If necessary, the two can also be welded. A welding groove 11 is provided in the main housing 1 of the connector at the position corresponding to the outer conductive electrode 32. The welding groove 11 is used to accommodate solder, so that the outer conductive electrode 32 and the main housing 1 of the connector form a fixed and conductive connection (i.e., the outer conductive electrode 32 is connected to the outer conductor).

[0044] In this invention, the RF connector is an N-type RF connector. A plug-end locking cap 12 is rotatably mounted on the outside of the connector main housing 1. The plug-end locking cap 12 and the connector main housing 1 are connected by a locking cap retaining ring 13. The plug-end locking cap 12 and the connector main housing 1 have corresponding retaining groove structures. During installation, the locking cap retaining ring 13 is first installed on the retaining groove on the connector main housing 1. The locking cap retaining ring 13 has a C-shaped structure. After pressing and retracting the locking cap retaining ring 13, it is inserted into the plug-end locking cap 12. After the locking cap retaining ring 13 springs back, it is then inserted into the plug-end locking cap 12. The slots engage to form a connection. The coaxial gas discharge tube 3 is designed to match the internal dimensions of the connector main housing 1, allowing the inner conductive electrode 31 to be directly fitted onto the conductive inner core 2 and then welded together. The connector main housing 1 has a welding groove 11, where the connector main housing 1 and the outer conductive electrode 32 can be welded. After the outer insulating bushing 4 and the conductive inner core 2 of the coaxial gas discharge tube 3 are sequentially placed inside the connector main housing 1, the outer conductive electrode 32 is welded to the connector main housing 1 at the welding groove 11 to complete the connection. Finally, the inner insulating bushing 5 is inserted for insulation and sealing.

[0045] It should be noted that the RF connector provided by this invention achieves overvoltage protection by replacing the inner insulating medium portion of a traditional RF connector with a coaxial gas discharge tube (the remaining insulating medium portion is divided into an outer insulating bushing 4 and an inner insulating bushing 5 for filling). Under normal operating conditions, the RF signal is transmitted with low loss between the inner and outer conductors, and the inert gas inside the coaxial gas discharge tube 3 remains insulating. Due to the high insulation properties of the inert gas in the coaxial gas discharge tube 3, and the optimized design of the structure and size of the inner conductive electrode 31 and the outer conductive electrode 32, the transmission loss of the RF signal is minimal, ensuring high-quality transmission of the RF signal. When a strong electromagnetic pulse voltage occurs, the gas inside the coaxial gas discharge tube 3 is ionized, and a conductive channel is formed between the inner conductive electrode 31 and the outer conductive electrode 32 (preferably formed between the two sets of discharge electrodes 34), quickly discharging the overvoltage to the outer conductor, i.e., connecting to the device housing (lightning protection ground wire) through the connector main housing 1. This protects the back-end RF antenna and other RF equipment from damage by strong electromagnetic pulses. After the discharge ends, as the voltage returns to normal, the plasma quickly recombines, and the gas discharge tube returns to its insulating state, without affecting the normal transmission of RF signals.

[0046] Practical application verification shows that this RF connector can maintain good RF transmission performance in the 0-3GHz frequency band while having excellent electromagnetic protection capabilities.

[0047] In the above embodiments, the present invention provides a protection scheme that can be directly integrated into the inside of an RF connector, without increasing the space occupied or system connection nodes, and has strong electromagnetic protection capabilities. That is, the coaxial gas discharge tube 3 is fused into the main housing 1 of the connector to form an RF connector with strong electromagnetic protection capabilities, and the RF connector is used in the circuit connection of the RF antenna, so that the RF antenna can obtain effective electromagnetic protection capabilities without using an external protection module. In the above scheme, the connection and point contact between the coaxial gas discharge tube 3 and the main housing 1 of the connector is achieved by the welding groove 11 reserved in the main housing 1 of the connector, which is filled with solder. When heated, the solder melts and directly contacts the external conductive electrode 32, and then is cooled and fixed to form a weld.

[0048] In some large-volume RF connectors requiring strong protection, the actual volume of the coaxial gas discharge tube 3 is also relatively large. During soldering, the solder needs to be melted, and the external conductive electrode 32 is in direct contact with the solder, causing its temperature to rise. This leads to a slight outward expansion of the external conductive electrode 32. Especially when the inner cavity of the coaxial gas discharge tube 3 is filled with gas, the increased temperature and the tendency of the gas to expand further intensify the outward expansion of the external conductive electrode 32. During the process of solder cooling and solidification, especially when the solder has solidified but the temperature continues to drop, the external conductive electrode 32 will continue to shrink back to its initial state. In this process, the outer surface of the external conductive electrode 32 is prone to separation from the solidified solder, thus affecting the soldering and fixing effect, as well as the electrical connection between the external conductive electrode 32 and the connector main housing 1 (i.e., affecting the connection effect between the external conductive electrode 32 and the lightning protection ground wire). This, in turn, affects the protection quality of the RF connector of this invention and, in severe cases, can cause certain safety hazards.

[0049] To further improve the product quality and actual protection effect of the RF connector of this invention, the present invention also provides the following solutions, specifically as detailed in the appendix to the specification. Figure 5A thermal expansion restraint ring 6 is provided in the main housing 1 of the connector at the position corresponding to the external conductive electrode 32. The area between the thermal expansion restraint ring 6 and the external conductive electrode 32 is a welding groove 11. The thermal expansion restraint ring 6 is a thin-walled ring structure. The thermal expansion restraint ring 6 has the ability to expand and contract with the inner wall diameter increasing when heated and decreasing when cooled. The thermal expansion coefficient of the thermal expansion restraint ring 6 is higher than that of the coaxial gas discharge tube 3. The thermal expansion restraint ring 6 is a metal structure to provide an effective conductive connection (for example, when copper is used for the external conductive electrode 32, aluminum or other metals can be used for the thermal expansion restraint ring 6). During welding, the connector... The connector main housing 1 is inverted so that the soldering groove 11 faces upward. During the soldering and fixing process of the coaxial gas discharge tube 3 and the connector main housing 1, the thermal expansion restraint ring 6 will also expand when the solder is heated, and will also shrink when the solder cools and contracts. As the solder gradually solidifies, it will compress the solder. The external conductive electrode 32 is also in a contracted state, compressing the solder as much as possible so that the solder can fully contact the outer wall of the external conductive electrode 32. This effectively improves the fixing quality of the soldering and the point contact connection quality of the soldering, thereby effectively ensuring the actual quality of the RF connector provided by the present invention.

[0050] Example 2, refer to the appendix of the instruction manual. Figures 6 to 8 This embodiment provides a thermal expansion restraint ring 6, which is a split restraint ring 61. The split restraint ring 61 is a thin-walled circular ring structure (although the ring structure tends to expand inward during thermal expansion, the thin-walled circular ring structure used in this embodiment has a stronger overall thermal expansion effect, so the inner wall diameter is also relatively increased). There is a reserved space between the outer wall of the split restraint ring 61 and the connector main housing 1. The end of the split restraint ring 61 near the middle of the connector main housing 1 is in sliding contact with the connector main housing 1. A welding groove 11 is formed between the inner wall of the split restraint ring 61 and the outer wall of the outer conductive electrode 32. Before welding, solder is placed in this area.

[0051] During welding, the temperature rises; please refer to the instruction manual appendix. Figure 7 The split-type binding ring 61 expands outwards. During the solder cooling and solidification process, refer to the instruction manual appendix. Figure 8 The split binding ring 61 will contract inward, thus tending to squeeze the solder onto the outer conductive electrode 32. After the solder is completely solidified, the end of the solder will directly contact the welding groove 11, and the inner and outer sides of the solder will contact and connect with the outer conductive electrode 32 and the split binding ring 61 respectively, thereby forming a stable weld.

[0052] Example 3: In the above examples, although the split-type restraint ring 61 has good deformation freedom due to its split structure, its end is in a sliding state with the connector main housing 1. Therefore, there is a risk of leakage when the solder melts. For this reason, please refer to the appendix to the specification. Figure 9 In this embodiment, a counter-pressure support component 7 is added. During welding, the split-type restraint ring 61 is used in conjunction with the counter-pressure support component 7. The counter-pressure support component 7 is used to apply pressure to the split-type restraint ring 61 so that the split-type restraint ring 61 is in close contact with the connector main housing 1 to avoid solder leakage.

[0053] During welding, the pressure of the counter-pressure support component 7 is applied to the split-type restraint ring 61, which makes the split-type restraint ring 61 relatively stable and effectively contacts the connector main housing 1.

[0054] Example 4: In the above embodiments, the split restraint ring 61 can adopt a simple cylindrical structure. Furthermore, this embodiment also provides a drum-shaped split restraint ring 61, as shown in the appendix to the specification. Figure 10 The split-type restraint ring 61 has a drum-shaped structure, meaning that the waist of the split-type restraint ring 61 protrudes outward. The counter-pressure support assembly 7 includes an external fixing structure 71 and a thermal expansion block structure 72. The external fixing structure 71 is fixedly installed on the outside of the connector main housing 1 during welding (the external fixing structure 71 can be directly connected to the connector main housing 1, or a corresponding tooling can be used to fix it). The thermal expansion block structure 72 is fixedly installed on the external fixing structure 71 and fits against the end of the split-type restraint ring 61.

[0055] In this embodiment, the thermal expansion pressure block structure 72 can be a solid structure, directly fixed on the external fixing structure 71. The thermal expansion pressure block structure 72 can be made of metal or other materials that have thermal expansion deformation. During the welding heating process, the thermal expansion pressure block structure 72 itself will also expand and form axial compression on the split binding ring 61, thereby causing the waist of the split binding ring 61 to produce greater outward deformation. During the subsequent cooling process, the thermal expansion pressure block structure 72 will shrink, and the compression deformation of the split binding ring 61 will also recover, thereby improving the compression effect on the solder.

[0056] Example 5, see attached instruction manual Figure 11This embodiment also provides another thermal expansion block structure 72. Specifically, the thermal expansion block structure 72 includes a fixed cylinder 721 and a movable cylinder 722. The fixed cylinder 721 is fixedly connected to the external fixed structure 71, and the movable cylinder 722 is slidably disposed on the fixed cylinder 721. The movable cylinder 722 is in contact with the split-type binding ring 61. Gas is filled between the fixed cylinder 721 and the movable cylinder 722, and a sealing structure is provided between the fixed cylinder 721 and the movable cylinder 722. Thus, in the actual welding process, under the action of gas expansion in the fixed cylinder 721 and the movable cylinder 722, the axial compressive force on the split-type binding ring 61 can be increased, so as to increase the expansion deformation of the split-type binding ring 61 when heated.

[0057] Example 6, see attached instruction manual Figure 12 The present invention also provides another thermal expansion restraint ring 6, namely, the thermal expansion restraint ring 6 is an integral restraint ring 62, the integral restraint ring 62 and the connector main housing 1 are integral structures, the thickness of the integral restraint ring 62 gradually decreases in the direction away from the connector main housing 1 (the overall structure is still thin-walled, and the relatively thicker connection is to take into account the fixed connection of the integral restraint ring 62), the outer wall of the integral restraint ring 62 is reserved with a space for movement between it and the connector main housing 1, and the area between the inner wall of the integral restraint ring 62 and the outer wall of the outer conductive electrode 32 is a welding groove 11.

[0058] When using the integrated retaining ring 62, there is no need to consider the issue of solder leakage after melting. Furthermore, the connection between the integrated retaining ring 62 and the connector main housing 1 is more stable after the solder solidifies. Although there is a connection point between the integrated retaining ring 62 and the connector main housing 1, preventing overall thermal deformation like the separate retaining ring 61, the area of ​​the integrated retaining ring 62 away from the connection point with the connector main housing 1 will still experience thermal expansion deformation during heating. However, because of the connection point, this expansion deformation causes the integrated retaining ring 62 to deform into a trumpet shape. The deformation of the integrated retaining ring 62 during the soldering process can be found in the attached instruction manual. Figure 13 .

[0059] Example 7, see attached instruction manual Figure 14 To increase the deformation range of the integrated binding ring 62 and thus improve the extrusion effect on the solder, this embodiment provides the following technical solution, which is detailed in the appendix to the specification. Figures 14 to 16A piston pressure plate 73 is slidably installed inside the connector main housing 1. An inner conical sleeve 731 is fixedly connected to the area of ​​the outer wall of the integrated restraint ring 62 corresponding to the piston pressure plate 73. The inner wall of the inner conical sleeve 731 is a conical inner wall. A piston space is formed between the piston pressure plate 73 and the connector main housing 1 on one side corresponding to the integrated restraint ring 62. A sealing structure is provided between the piston pressure plate 73 and the connector main housing 1, thereby forming a piston structure. An air hole is provided in the piston pressure plate 73, and a sealing plug 732 is provided in the air hole.

[0060] Before welding, assemble the piston pressure plate 73 into the connector main housing 1. After tightening the piston pressure plate 73, install the sealing plug 732 in the vent hole to seal the piston pressure plate 73. During welding heating, the gas inside the piston pressure plate 73 expands, causing the piston pressure plate 73 to move outward, while the integrated restraint ring 62 can deform outward normally. During the cooling and solidification process, refer to the attached instruction manual. Figure 15 The air inside the piston pressure plate 73 contracts, causing the piston pressure plate 73 to move inward and provide additional extrusion force to the integrated binding ring 62. Then, with the help of the inner conical sleeve 731, the extrusion of the integrated binding ring 62 on the outside increases the inward deformation of the integrated binding ring 62, thereby increasing the extrusion effect on the solder and improving the welding quality.

[0061] It should be noted that this embodiment is similar in principle to Embodiment 5. Both increase the shrinkage deformation of the thermal expansion restraint ring 6 by providing an additional pressure to the thermal expansion restraint ring 6 during the cooling and contraction process through an additional set of thermal deformation components. However, in this embodiment, the integrated restraint ring 62 and the connector main housing 1 are an integral structure. Therefore, the bonding strength after welding is higher. Moreover, the piston pressure plate 73 can be directly placed in the connector main housing 1. Refer to the appendix of the instruction manual. Figure 16 During the subsequent assembly of the inner insulating bushing 5, additional compression can be applied to the integral restraint ring 62 to provide a securing effect.

[0062] Example 8: In addition to the above-mentioned method of adding a thermal expansion restraint ring 6 to provide additional extrusion to the solder to improve the welding effect, this example can also improve the coaxial gas discharge tube 3. For example, refer to the appendix of the specification. Figure 17 The outer wall of the external conductive electrode 32 is provided with multiple sets of inclined grooves 321. The inclined grooves 321 are gradually inclined towards the middle of the connector main housing 1 from the outside to the inside. Specifically, when the connector main housing 1 is being soldered, the inclined grooves 321 are inclined downwards. When the solder melts, some of the solder will enter the inclined grooves 321, thereby improving the bonding strength between the solder and the external conductive electrode 32. Even when the external conductive electrode 32 cools and shrinks and a gap is formed between it and the solder, some of the solder will still fully contact the inclined grooves 321, thereby improving the stability of the conductive connection.

[0063] Example 9: The coaxial gas discharge tube 3 provided in this example also mainly uses welding to connect the inner conductive electrode 31, the outer conductive electrode 32, and the insulating isolation plate 33. However, when the outer conductive electrode 32 is welded to the connector main housing 1, one end of the insulating isolation plate 33 is exposed. During the welding of the outer conductive electrode 32, its internal temperature rises, and the internal gas expands. Therefore, the exposed insulating isolation plate 33 is at risk of sealing failure. To address this, this example also improves the coaxial gas discharge tube 3. For details, please refer to the appendix of the specification. Figure 18 The insulating isolating plate 33 has a protrusion extending into the area between the inner conductive electrode 31 and the outer conductive electrode 32. The protrusion is provided with a straight-walled groove 331. A through slot is reserved between the outer conductive electrode 32 and the insulating isolating plate 33 for the solder to enter. The outer conductive electrode 32 is provided with an inclined-walled groove 322 at the position corresponding to the straight-walled groove 331. The inner wall of the inclined-walled groove 322 has a conical structure. Therefore, when the insulating isolating plate 33 is welded to the inner conductive electrode 31 and the outer conductive electrode 32, the solder can enter the area between the straight-walled groove 331 and the inclined-walled groove 322. After the solder solidifies, it forms a snap-fit ​​structure, which forms the same unilateral axial fixing force between the insulating isolating plate 33 and the outer conductive electrode 32, thereby enhancing the axial connection strength between the insulating isolating plate 33 and the outer conductive electrode 32 and improving its sealing effect.

[0064] It should be noted that when the external conductive electrode 32 is soldered to the connector main housing 1, the temperature will rise accordingly. However, the actual soldering can be done by tin soldering, and the actual soldering temperature will not be too high (the melting point of tin is 231.9℃, the melting point of traditional leaded solder, such as 60 / 40 tin-lead alloy, is about 183℃, while the melting point of lead-free solder is usually higher, between about 217℃ and 220℃). As for the insulation structure such as the outer insulating bushing 4 and the inner insulating bushing 5, ceramic structure or other high-temperature resistant insulating plastic structure such as polytetrafluoroethylene can be used. The corresponding sealing structure and sealing plug 732 can also be made of high-temperature resistant plastic structure and will not be affected by the soldering temperature.

[0065] The embodiments of this example have been described above. However, this example is not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of this example, and all of them are within the protection scope of this example.

Claims

1. A radio frequency connector with strong electromagnetic pulse protection capability, comprising a connector main housing (1), wherein a conductive inner core (2) is disposed inside the connector main housing (1), characterized in that: The conductive inner core (2) is provided with a coaxial gas discharge tube (3) on its outside. The two ends of the coaxial gas discharge tube (3) are respectively provided with an outer insulating bushing (4) and an inner insulating bushing (5). The coaxial gas discharge tube (3) includes an inner conductive electrode (31) and an outer conductive electrode (32). The inner conductive electrode (31) and the outer conductive electrode (32) are coaxial. The inner conductive electrode (31) is fixedly installed outside the conductive inner core (2). The space formed by the inner conductive electrode (31) and the outer conductive electrode (32) is filled with inert gas. A thermal expansion restraint ring (6) is provided in the main housing (1) of the connector at the position corresponding to the external conductive electrode (32). The area between the thermal expansion restraint ring (6) and the external conductive electrode (32) is a welding groove (11). The thermal expansion coefficient of the thermal expansion restraint ring (6) is higher than that of the external conductive electrode (32). The external conductive electrode (32) and the main housing (1) of the connector are fixed by welding at the welding groove (11).

2. The radio frequency connector with strong electromagnetic pulse protection capability according to claim 1, characterized in that: The two ends of the inner conductive electrode (31) and the outer conductive electrode (32) are fixedly connected by a set of insulating isolation sheets (33), and a protruding discharge electrode (34) is provided between the inner conductive electrode (31) and the outer conductive electrode (32).

3. The radio frequency connector with strong electromagnetic pulse protection capability according to claim 2, characterized in that: The thermal expansion restraint ring (6) is a split restraint ring (61). The split restraint ring (61) is a thin-walled circular ring structure. There is a reserved space between the outer wall of the split restraint ring (61) and the main housing (1) of the connector. The end of the split restraint ring (61) near the middle of the main housing (1) of the connector slides in contact with the main housing (1).

4. The radio frequency connector with strong electromagnetic pulse protection capability according to claim 3, characterized in that: The radio frequency connector also includes a reverse pressure support assembly (7). During soldering, the split-type binding ring (61) is used in conjunction with the reverse pressure support assembly (7), and the reverse pressure support assembly (7) is used to apply axial pressure to the split-type binding ring (61).

5. The radio frequency connector with strong electromagnetic pulse protection capability according to claim 4, characterized in that: The split-type restraint ring (61) has a drum-shaped structure, that is, the waist of the split-type restraint ring (61) protrudes outward. The counter-pressure support assembly (7) includes an external fixing structure (71) and a thermal expansion block structure (72). The external fixing structure (71) is fixedly installed outside the connector main housing (1) during welding. The thermal expansion block structure (72) is fixedly installed on the external fixing structure (71). The thermal expansion block structure (72) is fitted to the end of the split-type restraint ring (61). When the thermal expansion block structure (72) generates thermal expansion, it forms an axial compression on the split-type restraint ring (61).

6. The radio frequency connector with strong electromagnetic pulse protection capability according to claim 5, characterized in that: The thermal expansion block structure (72) includes a fixed cylinder (721) and a movable cylinder (722). The fixed cylinder (721) is fixedly connected to the external fixed structure (71). The movable cylinder (722) is slidably disposed on the fixed cylinder (721) and is in contact with the split binding ring (61). Gas is filled between the fixed cylinder (721) and the movable cylinder (722), and a sealing structure is provided between the fixed cylinder (721) and the movable cylinder (722).

7. The radio frequency connector with strong electromagnetic pulse protection capability according to claim 2, characterized in that: The thermal expansion restraint ring (6) is an integral restraint ring (62). The integral restraint ring (62) and the connector main housing (1) are an integral structure. The integral restraint ring (62) is a thin-walled ring structure. The thickness of the integral restraint ring (62) gradually decreases in the direction away from the connector main housing (1). There is a reserved space between the outer wall of the integral restraint ring (62) and the connector main housing (1).

8. The radio frequency connector with strong electromagnetic pulse protection capability according to claim 7, characterized in that: A piston pressure plate (73) is slidably installed inside the main housing (1) of the connector. An inner conical sleeve (731) is fixedly connected to the area of ​​the outer wall of the integrated restraint ring (62) of the piston pressure plate (73). The inner wall of the inner conical sleeve (731) is a conical inner wall. A piston space is formed between the side of the piston pressure plate (73) corresponding to the integrated restraint ring (62) and the main housing (1) of the connector. A sealing structure is provided between the piston pressure plate (73) and the main housing (1) of the connector. An air hole is provided in the piston pressure plate (73), and a sealing plug (732) is provided in the air hole.

9. A radio frequency connector with strong electromagnetic pulse protection capability according to any one of claims 2 to 8, characterized in that: The outer wall of the external conductive electrode (32) is provided with multiple sets of inclined grooves (321), which are gradually inclined towards the middle of the connector main housing (1) in the direction from the outside to the inside.

10. A radio frequency connector with strong electromagnetic pulse protection capability according to claim 9, characterized in that: The insulating isolation sheet (33) has a protrusion extending into the area between the inner conductive electrode (31) and the outer conductive electrode (32). A straight-walled groove (331) is provided on the protrusion. A through slot for solder to enter is reserved between the outer conductive electrode (32) and the insulating isolation sheet (33). An inclined-walled groove (322) is provided at the position of the outer conductive electrode (32) corresponding to the straight-walled groove (331). The inner wall of the inclined-walled groove (322) has a conical structure. The outer conductive electrode (32) and the insulating isolation sheet (33) are connected by welding. After the solder between the inclined-walled groove (322) and the straight-walled groove (331) solidifies, a snap-fit ​​structure is formed.

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