S-band pair type coupling radio frequency rotary joint

Abstract

The invention relates to the technical field of radio frequency rotary joints, in particular to an S-band pair type coupling radio frequency rotary joint which comprises a bottom shell, a single module, a connecting ring, a driving structure and a sealing structure. The bottom shell is provided with the single module, the single module is easy to assemble, the production efficiency is high, the electrical performance is stable, no friction device exists between the rotating structure and the stator shell except the bearing in the single joint, the service life of the product is determined by the bearing, the rotating service life of the bearing is long, and therefore the service life of the rotating joint is long; the joint rotors on the single joints of the two single modules are connected through the driving structure, the purpose of synchronous rotation of the joint rotors of the modules is achieved, the rotation synchronism of the joint rotors is improved, meanwhile, a multi-channel rotating joint can be formed in a tower connection mode, and assembling and production of products are facilitated; the sealing performance of the rotary joint is improved through the sealing structure, and the using effect of the rotary joint is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of radio frequency rotary joints, and more specifically, to an S-band pair-coupled radio frequency rotary joint. Background Art

[0002] Radio frequency rotary joints are used for uninterrupted signal transmission when devices such as radars rotate. With the continuous development of radar technology, their applications are becoming more and more widespread. For example, the rotary joints used in phased array radars must support multi-channel and broadband operations and maintain stable signal transmission under high-speed rotation; the coupled rotary joint transmits the received signal to the coupling system through a feeder, and the coupling system at the other end couples to the signal and then transmits the signal to the feeder, thereby realizing signal transmission; the coupled rotary joints are mostly multi-channel rotary joints, which are realized by the tower connection method. The driving of the joint is transmitted downward from the self-driving part, and the rotors of each joint form a linkage to complete.

[0003] However, at present, it is difficult to support the coupling plate of the radio frequency rotary joint. The coupling plate is currently mostly supported by small cylinders and epoxy resin, which is difficult to operate, requires a large number of toolings to be made, and the curing of the epoxy resin also prolongs the production cycle of the product; the central axis drive and the stator mostly achieve the purpose of isolating signals through the small clearance fit with the graphite ring. During the operation of the product, slight misalignment can cause friction between the central axis and the graphite ring, resulting in a large amount of graphite powder accumulation inside the joint. If it falls into the bearing, it will cause the bearing to jam, thereby damaging the product. Summary of the Invention

[0004] In view of the problems in the prior art, the present invention provides an S-band pair-coupled radio frequency rotary joint.

[0005] The technical solution adopted by the present invention to solve its technical problems is: an S-band pair-coupled radio frequency rotary joint, including a bottom shell, a single module arranged on the bottom shell, a connecting ring arranged on the single module, another single module arranged on the connecting ring, a driving structure arranged between the two single modules, and a sealing structure arranged on the single module;

[0006] The single module includes two single joints and a central axis. The bottoms of the two single joints face each other and are fixedly connected by bolts. One of the single joints is fixedly connected to the bottom shell, and the other single joint is fixedly connected to the connecting ring. A central axis with a cross-shaped cross-section is threadedly connected to the two single joints. There is a first ferrite on each side of the disk-shaped protrusion of the central axis. A wire passing hole is arranged inside the central axis. An isolation ring is arranged at the adjacent ends of the two single joints. The isolation ring is sleeved on the disk-shaped protrusion part of the central axis. A second ferrite is arranged at each of the opposite ends of the two single joints. A bearing retaining ring is fixedly connected to one of the single joints.

[0007] Specifically, the single joint includes a stator housing and a joint rotor rotatably connected inside the stator housing. One of the stator housings is fixedly connected to the bottom case, and the other stator housing is fixedly connected to the connecting ring. Two rotor power pieces are threadedly connected to each middle shaft, and the two rotor power pieces are respectively arranged inside the two joint rotors. Two stator power pieces are rotatably connected to each middle shaft, and the two stator power pieces are respectively arranged inside the two stator housings. A second port is fixedly installed on the stator housing by threads, and the second port is fixedly connected to the stator power piece. A first port is fixedly installed on the joint rotor by threads, and the first port is fixedly connected to the rotor power piece. A choke groove is provided inside the joint rotor.

[0008] Specifically, the driving structure includes a driving frame and a driving block. The driving frame is fixedly connected to one of the single joints of the same single module, and the driving block is fixedly connected to the other single joint. The driving frame on one single module is inserted into the driving block on the other single module.

[0009] Specifically, the driving frame is fixedly connected to the joint rotor, and the driving block is fixedly connected to the joint rotor.

[0010] Specifically, the sealing structure includes a first O-ring and a second O-ring. A first O-ring is provided between the connecting ring and the single joint of the single module, and a second O-ring is provided between the two single joints of the same single module.

[0011] Specifically, the cross-section of the bottom case is a U-shaped structure, and a third O-ring is provided between the single joint of the bottommost single module and the bottom case.

[0012] The beneficial effects of the present invention are as follows:

[0013] (1) For the S-band pair-coupled radio frequency rotary joint of the present invention, a single module is provided on the bottom case. The single module is simple to assemble, has high production efficiency, stable electrical performance, and there are no friction devices between the rotating structure and the stator housing inside the single joint except for the bearings. The service life of the product is determined by the bearings, and the bearings have a long rotating life, so the rotary joint has a long service life.

[0014] (2) For the S-band pair-coupled radio frequency rotary joint of the present invention, a driving structure is provided on the single module. Through the driving structure, the joint rotors on the single joints of multiple single modules are connected, achieving the purpose of synchronous rotation of the joint rotors of multiple modules, improving the synchronization of the rotation of the joint rotors. At the same time, a multi-channel rotary joint can be formed by the way of connection, which is beneficial to the assembly and production of the product.

[0015] (3) In the S-band pair-coupled RF rotary joint of the present invention, sealing structures are provided between the single module and the bottom case and the connecting ring. The sealing performance of the rotary joint is improved through the sealing structures, and the usage effect of the rotary joint is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the drawings and embodiments.

[0017] Figure 1 FIG. is a schematic diagram of the overall structure of a preferred embodiment of the S-band pair-coupled RF rotary joint provided by the present invention;

[0018] Figure 2 is Figure 1 an enlarged schematic diagram of the structure of part A shown;

[0019] Figure 3 FIG. is a schematic diagram of the connection structure between the stator housing and the joint rotor of the present invention;

[0020] Figure 4 FIG. is a schematic diagram of the connection structure between the central axis and the first ferrite of the present invention;

[0021] Figure 5 FIG. is a schematic diagram of the structure of the rotor power splitting piece of the present invention;

[0022] Figure 6 FIG. is a schematic diagram of the structure of the stator power splitting piece of the present invention.

[0023] In the figure: 1, bottom case; 2, single module; 201, single joint; 2011, stator housing; 2012, joint rotor; 2013, rotor power splitting piece; 2014, stator power splitting piece; 2015, first port; 2016, second port; 2017, choke groove; 202, central axis; 203, isolation ring; 204, first ferrite; 205, wire passing hole; 206, bearing pressing ring; 207, second ferrite; 3, connecting ring; 4, drive structure; 401, drive frame; 402, drive block; 5, sealing structure; 501, first O-ring; 502, second O-ring; 503, third O-ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0025] As Figures 1-6As shown in the figure, a pair-coupled RF rotary joint in the S-band according to the present invention includes a bottom case 1, a single module 2 provided on the bottom case 1, a connection ring 3 provided on the single module 2, another single module 2 provided on the connection ring 3, a driving structure 4 provided between the two single modules 2, and a sealing structure 5 provided on the single module 2;

[0026] The single module 2 includes two single joints 201 and a central axis 202. The bottoms of the two single joints 201 face each other and are fixedly connected by bolts. One of the single joints 201 is fixedly connected to the bottom case 1, and the other single joint 201 is fixedly connected to the connection ring 3. A central axis 202 with a cross-shaped cross-section is threadedly connected to the two single joints 201. On both sides of the disk-shaped protrusion of the central axis 202, there is a first ferrite 204 each. A wire passing hole 205 is provided inside the central axis 202. A separation ring 203 is provided at the adjacent ends of the two single joints 201. The separation ring 203 is sleeved on the disk-shaped protrusion part of the central axis 202. At the opposite ends of the two single joints 201, there is a second ferrite 207 each. A bearing retaining ring 206 is fixedly connected to one of the single joints 201;

[0027] The single joint 201 includes a stator housing 2011 and a joint rotor 2012 rotatably connected inside the stator housing 2011. One of the stator housings 2011 is fixedly connected to the bottom case 1, and the other stator housing 2011 is fixedly connected to the connecting ring 3. Two rotor functional segments 2013 are threadedly connected to each of the central shafts 202, and the two rotor functional segments 2013 are respectively disposed inside the two joint rotors 2012. Two stator functional segments 2014 are rotatably connected to each of the central shafts 202, and the two stator functional segments 2014 are respectively disposed inside the two stator housings 2011. A second port 2016 is fixedly and threadedly installed on the stator housing 2011, and the second port 2016 is fixedly connected to the stator functional segment 2014. A first port 2015 is fixedly and threadedly installed on the joint rotor 2012, and the first port 2015 is fixedly connected to the rotor functional segment 2013. A choke groove 2017 is provided inside the joint rotor 2012;Thread the central axis 202 with a cross-shaped cross-section onto the single joint 201. During installation, the rotor of one of the single joints 201 of each single module 2 is fixed on the stator housing 2011 through a bearing retaining ring 206. By adjusting the screwing-in amount of the threads of the central axis 202, the clearance height between the disk-shaped protrusion of the central axis 202 and the first ferrite 204 is adjusted. With the help of measuring tools such as calipers, the clearance height is precisely controlled to meet the design standards to achieve good wave absorption and signal isolation effects. At the same time, pay attention to the direction of the wire passing hole 205 inside the central axis 202 to facilitate subsequent wiring. Before the central axis 202 is installed in place, first thread the two rotor power split pieces 2013 onto the central axis 202 and accurately place them inside the two joint rotors 2012. Then, rotatably connect the two stator power split pieces 2014 to the central axis 202 and install them inside the two stator housings 2011. After that, fixedly install the second port 2016 on the stator housing 2011 by threading, so that it is tightly connected to the stator power split piece 2014. Fix the first port 2015 on the joint rotor 2012 by threading to ensure its firm connection with the rotor power split piece 2013. When installing the power split pieces and ports, they must be strictly installed in the directions and positions required by the design to ensure that signals can be smoothly introduced into and exported from the transmission channel. At the same time, the joint rotor 2012 is designed with a choke groove 2017 structure to enable signals to pass through the transmission channel to the greatest extent. Install the third O-ring 503 on the single joint 201 with the bearing retaining ring 206 of the single module 2 and fixedly connect it to the bottom shell 1 through bolts. Install the connecting ring 3 with the first O-ring 501 on the other single joint 201 of the single module 2 on the bottom shell 1, so that the connecting ring 3 is in close fit with the single joint 201, and use the first O-ring 501 to ensure the sealing effect. Fix the single module 2 to the connecting ring 3 through the single joint 201 at its bottom to ensure a firm connection. During the installation process, pay attention to the relative positions of the two single modules 2 for subsequent installation of the drive structure 4. Through the connecting ring 3, the modular S-band pair-coupled rotary joint can be extended to a multi-channel rotary joint. Between the first ferrites 204 are the isolation ring 203 and the disk-shaped protrusion of the central axis 202, and this structure plays a role in wave absorption to achieve good isolation effects.;

[0028] Specifically, the driving structure 4 includes a driving frame 401 and a driving block 402. The driving frame 401 is fixedly connected to one of the single joints 201 of the same single module 2, and the driving block 402 is fixedly connected to the other single joint 201. The driving frame 401 on one single module 2 is inserted into the driving block 402 on the other single module 2. The driving frame 401 is fixedly connected to the joint rotor 2012, and the driving block 402 is fixedly connected to the joint rotor 2012. Insert the driving frame 401 on one single module 2 into the driving block 402 on the other single module 2, so that the joint rotors 2012 of the two single modules 2 are connected through the driving structure 4, ensuring that the driving frame 401 and the driving block 402 are installed in place, and ensuring that the joint rotors 2012 of multiple modules can rotate synchronously. After installation, manually rotate the joint rotor 2012 to check whether the connection of the driving structure is stable, and ensure that the joint rotors 2012 of multiple modules can rotate synchronously and smoothly. If there is jamming or abnormal noise during rotation, it is necessary to check and adjust in time.

[0029] Specifically, the sealing structure 5 includes a first O-ring 501 and a second O-ring 502. A first O-ring 501 is provided between the connecting ring 3 and the single joint 201 of the single module 2, and a second O-ring 502 is provided between the two single joints 201 of the same single module 2. The cross-section of the bottom shell 1 is a U-shaped structure, and a third O-ring 503 is provided between the single joint 201 of the lowermost single module 2 and the bottom shell 1. When it is necessary to replace different first O-ring 501, second O-ring 502 and third O-ring 503, the corresponding part of the joint can be disassembled by a wrench. The disassembly and installation are convenient while improving the sealing performance of the rotary joint.

[0030] When the present invention is in use, first, the central axis 202 with a cross-shaped cross-section is threadedly connected to the single joint 201. During installation, the rotor of the single joint 201 of one of each single module 2 is fixed on the stator housing 2011 through the bearing retaining ring 206. By adjusting the screwing amount of the thread of the central axis 202, the clearance height between the disk-shaped protrusion of the central axis 202 and the first ferrite 204 is adjusted. With the aid of measuring tools such as a caliper, the clearance height is accurately controlled to meet the design standard, so as to achieve good wave absorption and signal isolation effects. At the same time, pay attention to the direction of the wire passing hole 205 inside the central axis 202 to facilitate subsequent wiring. Before the central axis 202 is installed in place, the two rotor power dividing pieces 2013 are respectively threadedly connected to the central axis 202 and accurately placed inside the two joint rotors 2012. Then, the two stator power dividing pieces 2014 are rotatably connected to the central axis 202 and installed inside the two stator housings 2011. After that, the second port 2016 is fixedly installed on the stator housing 2011 by threading, so that it is closely connected to the stator power dividing piece 2014. The first port 2015 is fixedly installed on the joint rotor 2012 by threading to ensure its firm connection with the rotor power dividing piece 2013. When installing the power dividing piece and the port, it is necessary to strictly follow the directions and positions required by the design to ensure that the signal can be smoothly introduced into and exported from the transmission channel. At the same time, the joint rotor 2012 is designed with a choke groove 2017 structure, so that the signal can pass through the transmission channel to the maximum extent. The single joint 201 of the single module 2 with the bearing retaining ring 206 is installed with the third O-ring 503 and fixedly connected to the bottom case 1 by bolts. The connecting ring 3 with the first O-ring 501 is installed on the other single joint 201 of the single module 2 on the bottom case 1, so that the connecting ring 3 is closely attached to the single joint 201. The first O-ring 501 is used to ensure the sealing effect. The single module 2 is fixedly connected to the connecting ring 3 through the single joint 201 at its bottom to ensure a firm connection. During the installation process, pay attention to the relative positions of the two single modules 2 for subsequent installation of the drive structure 4. Through the connecting ring 3, the modular S-band pair-type coupling rotary joint can be extended to a multi-channel rotary joint. Between the first ferrites 204 are the isolation ring 203 and the disk-shaped protrusion of the central axis 202, and this structure plays a role in wave absorption to achieve a good isolation effect;

[0031] Then, the drive frame 401 on one single module 2 is inserted into the drive block 402 on another single module 2, so that the joint rotors 2012 of the two single modules 2 are connected through the drive structure 4. Ensure that the drive frame 401 and the drive block 402 are installed in place to ensure that the joint rotors 2012 of multiple modules can rotate synchronously. After the installation is completed, manually rotate the joint rotor 2012 to check whether the connection of the drive structure is firm, and ensure that the joint rotors 2012 of multiple modules can rotate synchronously and smoothly. If there is jamming or abnormal noise during rotation, it is necessary to check and adjust in time;

[0032] Finally, when it is necessary to replace different first O-ring seals 501, second O-ring seals 502 and third O-ring seals 503, the corresponding parts of the joint can be disassembled by a wrench, which is convenient for disassembly and installation and improves the sealing performance of the rotary joint at the same time.

[0033] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0034] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An S-band pair-coupled radio frequency rotary joint, characterized in that: It comprises a bottom shell (1), a single module (2) arranged on the bottom shell (1), a connecting ring (3) arranged on the single module (2), another single module (2) arranged on the connecting ring (3), a driving structure (4) arranged between the two single modules (2), and a sealing structure (5) arranged on the single module (2); The single module (2) comprises two single joints (201) and a central axis (202); the bottoms of the two single joints (201) are opposite to each other and are fixedly connected by bolts; one of the single joints (201) is fixedly connected to the bottom shell (1); the other single joint (201) is fixedly connected to the connecting ring (3); the central axis (202) having a "cross"-shaped cross section is threadedly connected to the two single joints (201); the disc-mounted protrusions of the central axis (202) are A first ferrite (204) is provided on each side, a wire hole (205) is provided inside the central axis (202), an isolation ring (203) is provided at the proximal ends of the two single joints (201), the isolation ring (203) is sleeved on the disc-mounted raised portion of the central axis (202), a second ferrite (207) is provided at the opposite ends of the two single joints (201), and a bearing pressure ring (206) is fixedly connected to one of the single joints (201).

2. The S-band pair-coupled radio frequency rotary joint according to claim 1, characterized in that: The single joint (201) comprises a stator housing (2011) and a joint rotor (2012) rotatably connected to the inside of the stator housing (2011), wherein one stator housing (2011) is fixedly connected to the bottom housing (1), and the other stator housing (2011) is fixedly connected to the connecting ring (3), and each of the central shafts (202) is threadedly connected to two rotor power splitters (2013), and the two rotor power splitters (2013) are respectively arranged inside the two joint rotors (2012), and each of the central shafts (202) is rotatably connected to two stator power splitters (2013). A stator power splitter (2014), wherein the two stator power splitters (2014) are respectively arranged inside two stator housings (2011); a second port (2016) is fixedly threadedly installed on the stator housing (2011); the second port (2016) is fixedly connected to the stator power splitter (2014); a first port (2015) is fixedly threadedly installed on the joint rotor (2012); the first port (2015) is fixedly connected to the rotor power splitter (2013); and a choke slot (2017) is arranged inside the joint rotor (2012).

3. The S-band pair-coupled radio frequency rotary joint according to claim 2, characterized in that: The driving structure (4) comprises a driving frame (401) and a driving block (402); the driving frame (401) is fixedly connected to one of the single joints (201) of the same single module (2); the driving block (402) is fixedly connected to another single joint (201); and the driving frame (401) on one single module (2) is plugged into the driving block (402) on another single module (2).

4. The S-band pair-coupled radio frequency rotary joint according to claim 3, characterized in that: The driving frame (401) is fixedly connected to the joint rotor (2012), and the driving block (402) is fixedly connected to the joint rotor (2012).

5. The S-band pair-coupled radio frequency rotary joint according to claim 1, characterized in that: The sealing structure (5) comprises a first O-ring (501) and a second O-ring (502); the first O-ring (501) is provided between the connecting ring (3) and the single joint (201) of the single module (2); and the second O-ring (502) is provided between two single joints (201) of the same single module (2).

6. The S-band pair-coupled radio frequency rotary joint according to claim 5, characterized in that: The cross section of the bottom shell (1) is a U-shaped structure, and a third O-ring (503) is provided between the single joint (201) of the single module (2) at the bottom and the bottom shell (1).

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