Braze-sealed multi-interface radio frequency coaxial connector

Abstract

A multi-interface radio frequency coaxial connector sealed by brazing comprises a vertically arranged cylindrical outer cylinder and a pin vertically arranged in the cylindrical outer cylinder, and an insulator is connected between the outer cylinder and the pin by brazing; the insulator is arranged to be of a columnar structure with a convex section and a hollow interior, the contact pin comprises a columnar connecting rod which is vertically arranged, and the insulator is arranged on the outer ring of the connecting rod in a sleeving manner; a transition piece is arranged outside the upper end of the connecting rod, the transition piece is connected with the insulator in a brazed mode, and the two ends of the connecting rod are further connected with inserting heads in a screwed mode. The insulator of the inverted-T-shaped structure can ensure the connection strength, reduce the weight of the insulator and facilitate the positioning of the contact pins, and meanwhile, the whole body adopts a vacuum brazing sealing mode, so that the air tightness and the mechanical strength are better ensured. And when the contact pin is worn and oxidized to lose efficacy, only the connecting plug part is replaced, and the whole coaxial connector does not need to be replaced, so that the use cost is greatly saved, and the efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of radio frequency coaxial connectors, and specifically relates to a brazing-sealed multi-interface radio frequency coaxial connector. Background Art

[0002] The radio frequency coaxial connector, also called RF connector, is an important component in radio frequency / microwave signal transmission. It is a connecting device used to connect coaxial transmission lines, mainly to achieve the interconnection between devices / modules and effectively transmit radio frequency and microwave signals. Currently, in the commonly used N-R type connectors, the insulator uses ceramics, and the inner and outer conductors use metals. When welding, due to the difference in the thermal expansion coefficients of different materials, it is necessary to select a metal with a thermal expansion coefficient similar to that of ceramics as the material for the inner and outer conductors, and the selectivity is less. Moreover, due to the working conditions of the coaxial connector, it needs to be frequently plugged and unplugged. Multiple plugging and unplugging actions will affect the mechanical performance and electrical connection of the plug interface, causing it to fail. When the plug interface fails, the entire connector needs to be replaced, which greatly causes waste and increases costs. Content of the Utility Model

[0003] To solve the technical problems in the above background art, such as the limited selectivity of the inner and outer conductor materials and the need to replace the entire connector when the plug interface fails, the utility model provides a brazing-sealed multi-interface radio frequency coaxial connector.

[0004] The technical solution of the utility model is as follows:

[0005] A brazing-sealed multi-interface radio frequency coaxial connector includes a vertically arranged columnar outer cylinder and a pin vertically arranged inside it. An insulator is also brazed between the outer cylinder and the pin. The insulator is set as a columnar structure with a "convex" cross-section and a hollow interior. The pin includes a vertically arranged columnar connecting rod, and the insulator is sleeved on the outer circle of the connecting rod. A transition piece is arranged outside the upper end of the connecting rod, and the transition piece is brazed to the insulator. Plug connectors are also screwed at both ends of the connecting rod.

[0006] The insulator with a "convex" structure can reduce its own weight while ensuring sufficient connection strength with the outer cylinder. Moreover, the transition piece can better fit the protruding part above the insulator, facilitating the positioning of the pin. At the same time, the insulator is connected to the outer cylinder and the pin by vacuum brazing, which better ensures the airtightness and mechanical strength. In addition, the plug connector and the connecting rod are connected by a screw connection, which is convenient for the disassembly and assembly of the plug connector. After long-term repeated plugging and unplugging, when the plugging part is worn and oxidized and fails, only the plug connector part needs to be replaced, without replacing the entire coaxial connector (the above-mentioned brazing-sealed multi-interface radio frequency coaxial connector), which greatly saves the use cost and improves the efficiency.

[0007] Specifically, both ends of the connecting rod are provided with threaded grooves. One side of the connector is a first connector that can mate with the threaded grooves, and the other side is a second connector with a split crimping structure. The first connector enables quick assembly and disassembly from the connecting rod, while the second connector can connect to other components used for signal transmission.

[0008] To enhance the wear resistance, corrosion resistance, and electrical connection performance of the connection between the connector and the connecting rod, the surface of the connector is provided with an electroplated gold layer.

[0009] In a preferred embodiment, the connecting rod and the transition plate are integrally formed, which improves the overall strength and durability of the pin.

[0010] The insulator includes a first side surface that connects to the inner wall of the outer cylinder, and a metallized layer is also provided thereon. The outer cylinder is made of metal, while the insulator is made of ceramic. The metallized layer on its first side surface facilitates the connection between the insulator and the outer cylinder.

[0011] Furthermore, the insulator also includes a first surface connected to the transition piece, and a metallization layer is provided on the first surface. The transition piece is made of metal, and the insulator is made of ceramic. Providing a metallization layer on the first surface of the insulator facilitates the brazing connection between the insulator and the transition piece.

[0012] Preferably, the insulator further includes a second side parallel to the first side and a second surface parallel to the first surface; both the second side and the second surface are provided with a glaze layer. The glaze layer prevents the insulator surface from absorbing moisture, which is very beneficial for maintaining the high vacuum level of the coaxial connector.

[0013] In a preferred embodiment, one end of the outer cylinder is open and equipped with a threaded head for connecting to a transmission cable, while the other end has a clamping plate for connecting to a flange. The threaded head enables quick connection to the transmission cable, improving efficiency, while the clamping plate facilitates positioning when connecting to the flange, ensuring dimensional stability and reducing fixture costs.

[0014] Preferably, the outer cylinder is made of Kovar alloy / pure titanium, which has a relatively constant low or moderate coefficient of thermal expansion, and has high output current and high electrical signal propagation efficiency.

[0015] More preferably, the insulator material is alumina / zirconia, which has high conductivity and good cold and hot working properties.

[0016] Through the above design, the beneficial effects of this brazed-sealed multi-interface RF coaxial connector are as follows:

[0017] (1) The insulator surface is provided with a metallization layer and glaze, which improves the mechanical properties of the insulator and prevents it from being contaminated during the brazing process, thus avoiding sparking in the engineering process. The glaze layer also prevents the ceramic surface from absorbing moisture, which is very beneficial for maintaining the high vacuum of the coaxial connector. When metallizing a regular cylindrical structure, if the entire surface is metallized, it is easy for the metallization to spread, while if only a small part is metallized, it is difficult to process. However, the insulator of this utility model adopts a "convex" shaped structure, which can better avoid this problem. It can ensure the area of ​​the metallization layer on the surface of the insulator and also keep the insulator in its original shape.

[0018] (2) The pin is made into a detachable structure. The connector and the connecting rod are connected by a spiral, which makes it easy to disassemble and assemble the connector. After repeated plugging and unplugging for a long time, when the connector part is worn and oxidized and fails, only the connector part can be replaced. There is no need to replace the entire coaxial connector, which greatly saves the cost of use and improves efficiency.

[0019] (3) The surface of the plug is plated with gold, which enhances the wear resistance, corrosion resistance and electrical connection performance of the connection between the plug and the connecting rod. Attached Figure Description

[0020] In the attached diagram:

[0021] Figure 1 This is a front view of a brazed-sealed multi-interface radio frequency coaxial connector according to this utility model;

[0022] Figure 2 for Figure 1 Sectional view of AA in the middle;

[0023] Figure 3 This is a schematic diagram of the pins in the embodiment;

[0024] Figure 4 for Figure 3 Cross-sectional view of the middle section (BB);

[0025] Figure 5 This is a cross-sectional view of the insulator in the embodiment;

[0026] Figure 6 This is a schematic diagram of the outer cylinder in the embodiment;

[0027] Figure 7 This is a cross-sectional view of the outer cylinder in the embodiment;

[0028] The components represented by the various reference numerals in the diagram are:

[0029] 1. Outer cylinder; 11. Cylinder body; 12. Vent hole; 13. Support ring; 2. Insulator; 21. First side; 22. Second side; 23. First surface; 24. Second surface; 3. Pin; 31. Connecting rod; 32. Plug; 33. Transition plate; 4. Clamping platform; 5. Threaded head. Detailed Implementation

[0030] Exemplary embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings.

[0031] Example

[0032] Combination Figure 1 and Figure 2 This embodiment provides a brazed sealed multi-interface radio frequency coaxial connector, including a vertically arranged columnar outer cylinder 1 and a vertically arranged pin 3 inside it. An insulator 2 is also brazed between the outer cylinder 1 and the pin 3. The insulator 2 is connected to the outer cylinder 1 and the pin 3 by vacuum brazing, which better ensures airtightness and mechanical strength.

[0033] In this embodiment, combined with Figure 3 , Figure 4 The pin 3 includes a vertically arranged columnar connecting rod 31 with a diameter of 2-4 mm. The insulator 2 is sleeved on the outer ring of the connecting rod 31. A transition piece 33 is provided on the upper outer ring of the connecting rod 31, and the transition piece 33 is brazed to the upper side of the insulator 2. As a preferred embodiment, the connecting rod 31 and the transition piece 33 are integrally formed, which improves the overall strength and durability of the pin 3.

[0034] In this embodiment, the two ends of the connecting rod 31 are also spirally connected with plugs 32.

[0035] Specifically, both ends of the connecting rod 31 are provided with threaded grooves of size M1.2-M2. One side of the connector 32 is a first connector that mates with the threaded groove, and the other side is a second connector with a split crimping structure. The second connector has a four-segment crimping groove structure, with a groove width of 0.3-0.5mm and a groove depth of 6-9mm. The first connector allows for quick assembly and disassembly of the connector 32 from the connecting rod 31, while the second connector can connect to other components used for signal transmission. The connector 32 and the connecting rod 31 are connected by a screw thread, facilitating the assembly and disassembly of the connector 32. After prolonged and repeated use, if the connector part shows wear and oxidation failure, only the connector 32 needs to be replaced, without replacing the entire coaxial connector, greatly saving operating costs and improving efficiency.

[0036] To enhance the wear resistance, corrosion resistance, and electrical connection performance of the connection between the connector 32 and the connecting rod 31, the surface of the connector 32 is provided with an electroplated gold layer with a thickness of 0.2-1 μm.

[0037] The pin 3 is made of Kovar alloy / pure titanium, which has the advantages of high output current and high electrical signal propagation efficiency.

[0038] In this embodiment, combined with Figure 5 The insulator 2 is configured as a columnar structure with a "convex" shaped cross-section and a hollow interior, forming a cylindrical cavity. This "convex" shaped structure of the insulator 2 ensures sufficient connection strength with the outer cylinder 1 while reducing its own weight. The diameter of the cylindrical cavity within the insulator matches the connecting rod 31 of the pin 3, and the gap between the cavity and the pin 3 is between 0.1-0.2 mm, facilitating the insertion and subsequent welding of the pin 3. Furthermore, if the insulator 2 adopts a regular cylindrical structure, metallization can easily lead to flow issues if the entire surface is metallized, while metallization of only a small portion becomes difficult. However, the "convex" shaped structure of the insulator 2 in this invention effectively avoids these problems, ensuring both the area of ​​the metallized layer on the surface of the insulator 2 and maintaining its original shape.

[0039] Regarding the specific structure of insulator 2, combined with Figure 5 The insulator 2 includes a first side surface 21 connected to the inner wall of the outer cylinder 1, and a metallized layer is provided thereon. The outer cylinder 1 is made of metal, while the insulator 2 is made of ceramic. The metallized layer on its first side surface 21 facilitates the connection between the insulator 2 and the outer cylinder 1.

[0040] Furthermore, the insulator 2 also includes a first surface 23 connected to the transition piece 33, and a metallization layer is provided on the first surface 23. The transition piece 33 is made of metal, and the insulator 2 is made of ceramic. Providing a metallization layer on the first surface 23 of the insulator 2 facilitates the brazing connection between the insulator 2 and the transition piece 33.

[0041] In specific implementation, the metallization layer is made using the molybdenum-manganese method, with a specific thickness of 10-30 μm for MoMn and 2-10 μm for the nickel plating layer.

[0042] Preferably, the insulator 2 further includes a second side 22 disposed parallel to the first side 21, and a second surface 24 disposed parallel to the first surface 23; both the second side 22 and the second surface 24 are provided with a glaze layer, the depth of which is 0.05-0.1 mm. The glaze layer prevents the surface of the insulator 2 from absorbing moisture, which is very beneficial for maintaining the high vacuum level of the coaxial connector.

[0043] More preferably, the insulator 2 is made of alumina / zirconia, and its alumina or zirconium oxide content can be selected as 95% / 97% / 99%, which has high conductivity and good cold and hot working performance.

[0044] As a preferred implementation method, combined with Figure 6 , Figure 7 The outer cylinder 1 is open at one end to the atmosphere and has a threaded head 5 for connecting to a transmission cable. The other end is a vacuum side. Its inner diameter is 10-15mm, and its outer ring has a clamping platform 4 for connecting to a flange. The clamping platform 4 has a thickness of 0.5-1mm. The threaded head 5 enables quick connection to the transmission cable, improving efficiency. The clamping platform 4 facilitates positioning when connecting to the flange, ensuring dimensional stability and reducing fixture costs.

[0045] In specific implementation, the outer cylinder 1 is also provided with an exhaust hole 12 that runs through the inside and outside of the outer cylinder 1 on the side wall of the end closest to the atmosphere, so as to facilitate the discharge of excess gas during subsequent connection.

[0046] For example, a support ring 13 is also provided on the inner wall of the outer cylinder 1. The support ring 13 abuts against the lower side of the insulator 2 to prevent the insulator 2 from falling off before sealing.

[0047] Preferably, the outer cylinder 1 is made of Kovar alloy / pure titanium, which has a relatively constant low or moderate coefficient of thermal expansion, and has high output current and high electrical signal propagation efficiency.

[0048] The brazing sealing process of this utility model is as follows: Insulator 2 is placed inside outer cylinder 1 to ensure that the two parts are in close contact. Silver-based solder (AgCu28 / AgCuPd10, etc.) is placed at the mating point between the first side 21 of insulator 2 and the inner side of outer cylinder 1. The same solder is placed on the first surface 23 of insulator 2. Then, the pin 3 is inserted into the cylindrical cavity inside insulator 2, and the transition piece 33 is fitted and attached to the first surface 23. Then, it is placed in a vacuum furnace for vacuum brazing. After it comes out of the furnace, the airtightness of the coaxial connector and the coaxial dimensions of the pin 3 and outer cylinder 1 are tested.

[0049] Through the above design, the surface of the insulator 2 of the multi-interface RF coaxial connector with brazing seal of this utility model is provided with a metallization layer and glaze. This improves the mechanical properties of the insulator 2 while preventing contamination during brazing, which helps avoid sparking during use. The glaze layer also prevents the ceramic surface from absorbing moisture, which is very beneficial for maintaining the high vacuum of the coaxial connector. When metallizing a regular cylindrical structure, if the entire surface is metallized, it is easy for the metallization to spread, while if only a small part is metallized, it is difficult to process. However, the "convex" shaped structure of the insulator 2 of this utility model can better avoid this problem, which can ensure the area of ​​the metallization layer on the surface of the insulator 2 and also keep the insulator 2 in its original shape. The pin 3 is made into a detachable structure, and the connector 32 and the connecting rod 31 are connected by a screw, which facilitates the disassembly and assembly of the connector 32. After long-term repeated plugging and unplugging, when the plug part wears and oxidizes and fails, only the connector 32 needs to be replaced, without replacing the entire coaxial connector, which greatly saves the cost of use and improves efficiency. The surface of the connector 32 is plated with gold, which enhances the wear resistance, corrosion resistance and electrical connection performance of the connection between the connector 32 and the connecting rod 31.

Claims

1. A brazed-sealed multi-interface radio frequency coaxial connector, characterized in that, It includes a vertically arranged columnar outer cylinder (1) and a vertically arranged pin (3) inside it, and an insulator (2) is also brazed between the outer cylinder (1) and the pin (3); The insulator (2) is configured as a columnar structure with a "convex" cross-section and a hollow interior. The pin (3) includes a vertically arranged columnar connecting rod (31), and the insulator (2) is sleeved on the outer ring of the connecting rod (31). The upper end of the connecting rod (31) is provided with a transition piece (33), and the transition piece (33) is brazed to the insulator (2). The two ends of the connecting rod (31) are also spirally connected with plugs (32).

2. The brazed-sealed multi-interface RF coaxial connector according to claim 1, characterized in that, Both ends of the connecting rod (31) are provided with threaded grooves. One side of the plug (32) is a first connector that can cooperate with the threaded groove, and the other side is a second connector with a split crimping structure.

3. The brazed-sealed multi-interface RF coaxial connector according to claim 1, characterized in that, The surface of the connector (32) is provided with an electroplated gold layer.

4. The brazed-sealed multi-interface RF coaxial connector according to claim 1, characterized in that, The connecting rod (31) and the transition piece (33) are integrally formed.

5. A brazed-sealed multi-interface RF coaxial connector according to claim 1, characterized in that, The insulator (2) includes a first side surface (21) connected to the inner wall of the outer cylinder (1), and a metallized layer is also provided thereon.

6. A brazed-sealed multi-interface RF coaxial connector according to claim 5, characterized in that, The insulator (2) also includes a first surface (23) connected to the transition plate (33), and the first surface (23) is further provided with a metallization layer.

7. A brazed-sealed multi-interface RF coaxial connector according to claim 6, characterized in that, The insulator (2) further includes a second side (22) disposed parallel to the first side (21) and a second surface (24) disposed parallel to the first surface (23); A glazing layer is provided on both the second side (22) and the second surface (24).

8. A brazed-sealed multi-interface RF coaxial connector according to claim 1, characterized in that, The outer cylinder (1) is open at one end and has a threaded head (5) that can be connected to the transmission cable, and the outer ring of the other end has a clamp (4) that can be connected to the flange.

9. A brazed-sealed multi-interface RF coaxial connector according to claim 1, characterized in that, The outer cylinder (1) is made of Kovar alloy / pure titanium.

10. A brazed-sealed multi-interface RF coaxial connector according to claim 1, characterized in that, The insulator (2) is made of alumina / zirconia.

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