3mm waveguide i-type rotary joint

Abstract

The utility model discloses a 3mm waveguide I type rotary joint, including the round bar of metal material, and the both ends of round bar are connected respectively first waveguide coaxial converter and second waveguide coaxial converter, the coaxial outside of round bar is equipped with rotor, and the rotor is tubular, and the rear end of rotor is detachably connected with first waveguide coaxial converter, the outside of bearing is equipped with the tubular stator of bearing, and the rotor and stator are coaxially arranged and do not contact, and the front end of stator is detachably connected with second waveguide coaxial converter, and the stator includes the outer pipe body and inner pipe body of coaxial arrangement, and the outer pipe body is sleeved in the outer ring of bearing, the cavity with the circular section is provided with in the middle part of the front end of rotor and is recessed back, and the rear section of inner pipe body is located in the cavity, and there is the gap between the rear end of inner pipe body and rotor, the choke design of being located on the round bar is transferred to the external conductor in the utility model, thereby avoid the choke design on the round bar, and the processing difficulty is greatly reduced.

Description

Technical Field

[0001] This utility model belongs to the field of microwave component technology, and in particular relates to a 3mm waveguide type I rotary joint. Background Technology

[0002] The 3mm waveguide is the BJ900 waveguide, with an operating frequency of 73.8–112 GHz. Since this product's frequency is close to 100 GHz, and the spatial wavelength of 100 GHz is calculated to be 3 mm, similar products can be called 3mm products to illustrate the product's operating frequency range. This operating frequency range is very high, and the product size is very small.

[0003] In 3mm waveguide rotary joint products, waveguide rotary joints are mostly used because waveguides are suitable for higher power capacity and signal quality, which leads to a significant increase in production costs.

[0004] If a coaxial rotary joint is used, the traditional choke method is performed on the inner conductor of the coaxial line. However, in a 3mm waveguide, the operating frequency band limits the structural size of the inner conductor, resulting in an inner conductor diameter of approximately 0.5mm. If a choke design is implemented, the manufacturing difficulty will be extremely high, akin to engraving words on a needle. Utility Model Content

[0005] The purpose of this invention is to provide a 3mm waveguide type I rotary joint, which greatly reduces the processing difficulty by dividing the coaxial external conductor into a rotor and a stator and implementing a choke design.

[0006] The present invention adopts the following technical solution: a 3mm waveguide type I rotary joint, comprising a round rod made of metal material, with the two ends of the round rod respectively connected to a first waveguide coaxial converter and a second waveguide coaxial converter;

[0007] A rotor is coaxially mounted on the outside of the round rod. The rotor is tubular and its rear end is detachably connected to the first waveguide coaxial converter. A bearing is mounted on the outside of the rotor, and a tubular stator is mounted on the outside of the bearing. The rotor and stator are coaxially mounted but do not contact each other.

[0008] The stator front end is detachably connected to the second waveguide coaxial converter; the stator includes an outer tube and an inner tube arranged coaxially, with the outer tube fitted onto the outer ring of the bearing.

[0009] The rotor has a circular cavity recessed at the front end; the rear section of the inner tube is located in the cavity, and there is a gap between the rear end of the inner tube and the rotor.

[0010] The inner tube is coaxial with the rotor and has the same inner diameter.

[0011] Furthermore, the front end of the first waveguide coaxial converter has a pin, and the rear end of the round rod has a socket, with the pin and socket being fixedly connected.

[0012] Furthermore, a stepped impedance transformer is provided inside the first waveguide coaxial converter, and the pin is connected to the stepped impedance transformer.

[0013] Furthermore, the pins are soldered to the sockets.

[0014] Furthermore, the second waveguide coaxial converter has an eccentric stepped waveguide transformation aperture, with both ends of the eccentric stepped waveguide transformation aperture being coaxial.

[0015] Furthermore, an outer conductor choke groove is provided between the outer periphery of the inner tube and the inner periphery of the rotor.

[0016] Furthermore, the cross-sectional area of ​​the eccentric stepped waveguide transformation aperture remains unchanged.

[0017] Furthermore, a non-metallic support ring is provided between the inner tube and the round rod;

[0018] The inner ring surface of the support ring is slidably connected to the round rod;

[0019] The outer ring surface of the support ring is fixedly connected to the inner tube body.

[0020] Furthermore, the outer rear section of the rotor has a positioning step, and the outer front section of the rotor has an annular groove for mounting a snap ring.

[0021] Furthermore, the bearing is installed between the positioning step and the annular groove.

[0022] The beneficial effects of this utility model are: the choke design located on the round rod is transferred to the external conductor, and the external conductor is divided into rotor and stator, thereby avoiding the choke design on the round rod, greatly reducing the processing difficulty and improving the yield of processed parts. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a 3mm waveguide type I rotary joint according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the cross-sectional structure of a 3mm waveguide type I rotary joint according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the stator structure in an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the rotor structure in an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the first waveguide coaxial converter in this embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the cross-sectional structure of the second waveguide coaxial converter in this embodiment of the present invention.

[0029] Among them: 10. Round rod; 11. Insertion hole;

[0030] 20. Rotor; 21. Positioning step; 22. First tube body; 23. Positioning ring; 24. Snap ring; 25. Annular groove;

[0031] 30. Stator; 31. Inner tube; 32. Outer tube;

[0032] 40. Bearings;

[0033] 50. First waveguide coaxial converter; 51. Stepped impedance transformer; 52. Plugging;

[0034] 60. Second waveguide coaxial converter; 61. Eccentric stepped waveguide conversion aperture;

[0035] 70. Outer conductor choke groove;

[0036] 80. Support ring. Detailed Implementation

[0037] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0038] A coaxial cable choke is a design element used in coaxial cable structures to prevent current from flowing along the surface of the outer conductor of the coaxial cable, thereby reducing electromagnetic leakage and interference. Chokes are typically designed using... Long small seam This is achieved through a long, wide slit. Because of the slit design, and because this slit suppresses leakage during electromagnetic waveguide transmission, structural rotational motion can be realized. Furthermore, the electromagnetic wave signal during rotation is not lost or leaked, making this design suitable for microwave communication in products such as rotary joints and rotary mechanisms.

[0039] Because the transmission line of the joint is waveguide → coaxial line → waveguide, and the coaxial line part needs to be choked during the transformation process. As a coaxial line, its transmission line form has inner and outer conductors, so the design requires inner conductor choke and outer conductor choke to achieve the rotational motion characteristics.

[0040] The coaxial cable only has an outer conductor choke slot, saving the need for a choke slot design at the inner conductor. For a 3mm waveguide rotary joint, the inner conductor diameter is very small, about 0.5mm. If a choke slot design were implemented, the manufacturing difficulty would be extremely high, the success rate would be less than 10%, and the reliability would be very low.

[0041] Therefore, this utility model discloses a 3mm waveguide type I rotary joint, such as Figure 1 and Figure 2 As shown, a circular rod 10 made of metal is included, with its two ends connected to a first waveguide coaxial converter 50 and a second waveguide coaxial converter 60, respectively. A rotor 20, which is tubular, is coaxially mounted outside the circular rod 10, and its rear end is detachably connected to the first waveguide coaxial converter 50. A bearing 40 is fitted around the rotor 20, and a tubular stator 30 is fitted around the bearing 40. The rotor 20 and stator 30 are coaxially mounted but not in contact. The front end of the stator 30 is detachably connected to the second waveguide coaxial converter 60. Figure 3 As shown, the stator 30 includes an outer tube 32 and an inner tube 31 arranged coaxially. The outer tube 32 is fitted onto the outer ring of the bearing 40. The rotor 20 has a circular cavity recessed at the front end. The rear section of the inner tube 31 is located in the cavity, and there is a gap between the rear end of the inner tube 31 and the rotor 20. The inner tube 31 is coaxial with the rotor 20 and has the same inner diameter.

[0042] In this invention, the choke design located on the round rod is transferred to the outer conductor, and the outer conductor is divided into rotor 20 and stator 30, thereby avoiding the choke design on the round rod 10 (i.e., the inner conductor), greatly reducing the processing difficulty and improving the yield of processed parts.

[0043] It should be noted that the directional terms such as "front" and "rear" in this utility model are only relatively illustrative and do not limit the position of any particular component. In other words, the product's front and rear positions are not limited during installation or use. Furthermore, the terms "rotor 20" and "stator 30" are also relatively illustrative; both rotor 20 and stator 30 can be used as rotating or stationary components. For example, when rotor 20 is a rotating component, stator 30 is a stationary component; when stator 30 is a rotating component, rotor 20 is a stationary component.

[0044] In this embodiment of the invention, the round rod 10 serves as the inner conductor, and a gap exists between it and the outer conductor to allow microwave propagation. Furthermore, to increase signal reliability, both the round rod 10 and the outer conductor are made of metallic materials.

[0045] In addition, in this invention, one end of the round rod 10 is fixedly connected to the first waveguide coaxial converter 50. The front end of the first waveguide coaxial converter 50 has a pin 52, and the rear end of the round rod 10 has a socket 11. The pin 52 is fixedly connected to the socket 11. More specifically, the pin 52 is welded to the socket 11, thereby increasing the connection reliability and the stability of the transmitted signal.

[0046] In one embodiment, such as Figure 5As shown, a stepped impedance transformer 51 is provided inside the first waveguide coaxial converter 50, and the pin 52 is connected to the stepped impedance transformer 51. The stepped impedance transformer 51 can increase the impedance matching between it and the round rod 10 and reduce the loss.

[0047] In this invention, since the rotor 20 is inconvenient to connect directly with the round rod 10, the first waveguide coaxial converter 50 is used as a connecting intermediate to achieve the connection between the two, so as to achieve the purpose of the rotor 20 driving the round rod 10 to rotate.

[0048] In this utility model, the structure of rotor 20 is as follows: Figure 4 As shown, it includes a first tube body 22, the inner cavity of which is cylindrical, and a circular rod 10 is located within the cylindrical cavity, with the two coaxially arranged. A plate-shaped platform is provided near the first waveguide coaxial converter 50, and an embedding hole is provided on the plate-shaped platform for mounting the first waveguide coaxial converter 50.

[0049] 10. A 3mm waveguide type I rotary joint as described in the above embodiment, characterized in that the bearing 40 is installed between the positioning step 22 and the annular groove 25.

[0050] In addition, a positioning step 22 coaxial with the first tube 22 is provided between the plate platform and the first tube 22. The positioning step 22 is used to position the installation position of the bearing 40. An annular groove 25 is also designed on the outer periphery of the front part of the first tube 22. The annular groove 25 is used to place the snap ring 24, so that the bearing 40 can be installed between the snap ring 24 and the positioning step 22.

[0051] That is, the outer rear section of the rotor 20 has a positioning step 22, and the outer front section of the rotor 20 has an annular groove 25, which is used to install the snap ring 24.

[0052] like Figure 6 As shown, the second waveguide coaxial converter 60 has an eccentric stepped waveguide conversion aperture 61. The two ends of the eccentric stepped waveguide conversion aperture 61 are coaxial, and the cross-sectional area of ​​the eccentric stepped waveguide conversion aperture 61 remains constant. This eccentric stepped waveguide conversion aperture 61 allows for orthogonal feeding of the coaxial line and the waveguide.

[0053] In this invention, an outer conductor choke groove 70 is provided between the outer periphery of the inner tube 31 and the inner periphery of the rotor 20. The "non-connection characteristic" of the choke groove 70 structure enables the "continuous propagation characteristic" of electromagnetic waves.

[0054] As a specific implementation, a non-metallic support ring 80 is provided between the inner tube 31 and the round rod 10; the inner ring surface of the support ring 80 is slidably connected to the round rod 10; and the outer ring surface of the support ring 80 is fixedly connected to the inner tube 31. The round rod 10 is supported at the front and rear by the support ring 80 and the pin respectively, thereby maintaining the stability of the round rod 10.

Claims

1. A 3mm waveguide type I rotary joint, characterized in that, A circular rod (10) made of metal material is provided, and the two ends of the circular rod (10) are respectively connected to a first waveguide coaxial converter (50) and a second waveguide coaxial converter (60); A rotor (20) is coaxially mounted on the outside of the round rod (10). The rotor (20) is tubular, and the rear end of the rotor (20) is detachably connected to the first waveguide coaxial converter (50). A bearing (40) is fitted on the outside of the rotor (20), and a tubular stator (30) is fitted on the outside of the bearing (40). The rotor (20) and the stator (30) are coaxially mounted and do not contact each other. The front end of the stator (30) is detachably connected to the second waveguide coaxial converter (60); the stator (30) includes an outer tube (32) and an inner tube (31) arranged coaxially, and the outer tube (32) is fitted onto the outer ring of the bearing (40); The rotor (20) has a circular cavity recessed at the front end center; the rear section of the inner tube (31) is located in the cavity, and there is a gap between the rear end of the inner tube (31) and the rotor (20). The inner tube (31) is coaxially arranged with the rotor (20) and has the same inner diameter.

2. The 3mm waveguide type I rotary joint as described in claim 1, characterized in that, The first waveguide coaxial converter (50) has a pin (52) at the front end and a socket (11) at the rear end of the round rod (10). The pin (52) is fixedly connected to the socket (11).

3. A 3mm waveguide type I rotary joint as described in claim 2, characterized in that, The first waveguide coaxial converter (50) is provided with a stepped impedance transformer (51), and the pin (52) is connected to the stepped impedance transformer (51).

4. A 3mm waveguide type I rotary joint as described in claim 3, characterized in that, The pin (52) is welded to the socket (11).

5. A 3mm waveguide type I rotary joint as described in any one of claims 2-4, characterized in that, The second waveguide coaxial converter (60) has an eccentric stepped waveguide transformation hole (61) with its two ends coaxial.

6. A 3mm waveguide type I rotary joint as described in claim 5, characterized in that, An outer conductor choke groove (70) is provided between the outer periphery of the inner tube (31) and the inner periphery of the rotor (20).

7. A 3mm waveguide type I rotary joint as described in claim 5, characterized in that, The cross-sectional area of ​​the eccentric stepped waveguide transformation aperture (61) remains unchanged.

8. A 3mm waveguide type I rotary joint as described in any one of claims 2-4, characterized in that, A non-metallic support ring (80) is provided between the inner tube (31) and the round rod (10); The inner ring surface of the support ring (80) is slidably connected to the round rod (10); The outer ring surface of the support ring (80) is fixedly connected to the inner tube body (31).

9. A 3mm waveguide type I rotary joint as described in claim 5, characterized in that, The outer rear section of the rotor (20) has a positioning step (21), and the outer front section of the rotor (20) has an annular groove (25) for mounting a snap ring (24).

10. A 3mm waveguide type I rotary joint as described in claim 9, characterized in that, The bearing (40) is installed between the positioning step (21) and the annular groove (25).

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