CN115799777A - Double-channel coaxial antenna rotary joint - Google Patents
Double-channel coaxial antenna rotary joint Download PDFInfo
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- CN115799777A CN115799777A CN202210998006.7A CN202210998006A CN115799777A CN 115799777 A CN115799777 A CN 115799777A CN 202210998006 A CN202210998006 A CN 202210998006A CN 115799777 A CN115799777 A CN 115799777A
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- Prior art keywords
- rotary joint
- dual
- composite material
- coaxial antenna
- channel coaxial
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- 239000002131 composite material Substances 0.000 claims abstract description 31
- 239000004020 conductor Substances 0.000 claims abstract description 31
- 238000001465 metallisation Methods 0.000 claims abstract description 10
- 239000011203 carbon fibre reinforced carbon Substances 0.000 claims description 30
- 230000007246 mechanism Effects 0.000 claims description 28
- 239000003989 dielectric material Substances 0.000 claims description 12
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical compound C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 6
- 238000004544 sputter deposition Methods 0.000 claims description 5
- 239000004642 Polyimide Substances 0.000 claims description 3
- 238000004026 adhesive bonding Methods 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000000280 densification Methods 0.000 abstract description 2
- 239000007769 metal material Substances 0.000 abstract description 2
- 230000003631 expected effect Effects 0.000 abstract 1
- 230000003746 surface roughness Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000005240 physical vapour deposition Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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- Waveguide Connection Structure (AREA)
Abstract
The invention relates to a double-channel coaxial antenna rotary joint, which can be suitable for the application background that the thermal deformation cannot meet the electrical property requirement when a longer rotary joint is designed, the structural stability of an inner conductor of the rotary joint is realized through the structural design of a C/C composite material with high thermal conductivity and low expansion, the composite material has the electrical conductivity equivalent to that of a metal material through the surface densification and the surface metallization of the C/C composite material, and the important invention that the composite material is used as a microwave transmission medium is realized. Meanwhile, the invention improves the temperature adaptability of the rotary joint, improves the reliability of the product, can be widely applied to the design of C and Ku frequency band rotary joints, and has strong practicability and market competitiveness. The invention is applied and verified in orbit in a certain satellite wind field measurement radar, and the performance index achieves the expected effect.
Description
Technical Field
The invention relates to a double-channel coaxial antenna rotary joint, which is used for realizing continuous rotation and electrical transmission of the rotary joint and belongs to the technical field of antenna mechanisms.
Background
The task requires a wind field measurement radar antenna subsystem from a wind cloud number three 05 satellite. The radio frequency channels of the wind field measurement radar antenna subsystem are a Ku channel and a C channel, and the two channels realize the transmission function of radio frequency signals of the antenna rotating part and the fixed high-power radio frequency assembly through the waveguide and the cable of the rotary joint.
The rotary joint of the existing satellite-borne satellite antenna is mainly a multi-path waveguide type rotary joint, a mechanism is connected with the rotary joint in series, the axial length of the rotary joint is too long, the number of movable parts is large, the coaxiality is difficult to adjust, and the reliability is low. And the coaxial rotary joint used on the satellite-borne antenna in a small amount is only a single channel and has a short axial length. Because the antenna is influenced by a large temperature gradient in an on-orbit manner, the dual-channel coaxial rotary joint is difficult to scatter and large in thermal deformation, so that the standing-wave ratio of the rotary joint is poor, and the performance of the antenna is influenced. In order to solve the problem, the C/Ku double-channel coaxial rotary joint with the low expansion temperature coefficient is invented.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects of the prior art are overcome, the dual-channel coaxial antenna rotary joint is provided, and the problem that the antenna standing wave performance is influenced by the thermal deformation of the rotary joint caused by poor heat dissipation capability of the satellite-borne dual-channel rotary joint under the condition of large long-axis-diameter ratio is solved.
The technical scheme of the invention is as follows: a kind of double-channel coaxial antenna rotary joint, the joint includes one-dimensional rotation scanning mechanism, rotating part and fixed part, the rotating part includes external moving axis, internal moving axis, inner conductor, the external moving axis, internal moving axis, inner conductor are installed from outside to inside coaxially and nestedly, and fixedly connect with the trochanter of the one-dimensional rotation scanning mechanism, the space that the inner hole of the external moving axis and excircle of the internal moving axis form C wave band cavity, used for spreading C wave band radio frequency signal, the space that the inner hole of the internal moving axis forms Ku wave band cavity, used for spreading C wave band radio frequency signal, the inner conductor is supported in Ku cavity through the dielectric material; the fixed part consists of an outer dead shaft and an inner dead shaft, wherein the outer dead shaft and the inner diameter shaft are coaxially nested and are fixedly connected with a stator of the one-dimensional rotating scanning mechanism.
Preferably, a gap is present between an end surface of the rotating part and an end surface of the fixed part, so that a lug space is formed between the rotating part and the fixed part.
Preferably, the value range of the clearance is 0.27 mm-0.33 mm.
Preferably, the carbon-carbon composite inner conductor is supported in the Ku cavity through a dielectric material.
Preferably, the dielectric material is a polyimide dielectric material.
Preferably, the end part of the inner conductor is fixed with the inner moving shaft shell in a gluing mode.
Preferably, the inner conductor is made of a carbon-carbon composite material.
Preferably, the inner conductor is manufactured by the following steps:
(1) Carrying out structural processing and forming on the C/C composite material;
(2) Carrying out vacuum carburization treatment on the surface of the C/C composite material after processing and forming;
(3) And carrying out surface metallization treatment on the surface of the C/C composite material subjected to the vacuum carburization treatment by adopting a vacuum sputtering process.
Preferably, the inner conductor is made of gold-plated carbon-carbon composite material.
Preferably, the C band signal is transmitted by means of a waveguide.
Preferably, the one-dimensional scanning mechanism comprises a brushless direct-current torque motor, a rotary transformer, a bearing and a supporting structure thereof. The brushless direct-current torque motor rotor and the rotary transformer rotor are connected through a rotating shaft flange, the motor stator and the rotary transformer stator are indirectly arranged on a shell flange through screws, and the stator and the rotor are supported through a pair of angular contact bearings and a deep groove ball bearing, so that one-dimensional rotation between the stator and the rotor is realized.
Compared with the prior art, the invention has the following advantages:
(1) The structure design of the coaxial rotary joint is compact: the channel C and the Ku joint are designed in a coaxial nested mode, an inner shaft of the channel C is used as an outer shaft of the Ku channel, the structural design is compact, and the C/Ku rotary joint can coaxially rotate;
(2) And the temperature adaptability is strong: the rotating joint adopts the C/C composite material with low expansion and high heat conductivity as the inner conductor of the coaxial rotating joint, so that the standing wave performance requirement is met under the condition of large-range temperature alternation;
(3) Surface densification and surface metallization of the C/C composite material: after the C/C composite material is processed, certain pores exist on the surface of the C/C composite material, so that the surface roughness is influenced, and the insertion loss index of the rotary joint is further influenced. In order to improve the conductivity and the surface roughness of the Ku inner conductor, the vacuum hole sealing treatment is carried out on the surface of the processed and molded C/C composite material, and after the treatment is finished, the gold plating treatment is carried out on the compact surface of the C/C composite material by utilizing a vacuum sputtering process. So as to obtain better conductivity and surface roughness of the inner conductor.
Drawings
FIG. 1 is a schematic structural view of a dual-channel C/Ku coaxial rotary joint according to an embodiment of the present invention;
FIG. 2 is a sectional view of a dual-channel C/Ku coaxial rotary joint structure according to an embodiment of the present invention;
FIG. 3 is an exploded view of a scanning mechanism nested dual channel coaxial rotary joint according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a nested dual-channel coaxial rotary joint of a scanning mechanism according to an embodiment of the present invention;
FIG. 5 is a schematic view of the connection between the rotating part of the rotary joint and the rotor of the one-dimensional rotary scanning mechanism according to the embodiment of the present invention;
FIG. 6 is a view of a rotary joint fixing part according to an embodiment of the present invention;
FIG. 7 is a schematic view of the connection between the rotating part of the rotary joint and the stator of the one-dimensional rotary scanning mechanism according to the embodiment of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific examples.
As shown in fig. 1 and fig. 2, the present invention provides a dual-channel antenna coaxial rotary joint, and the rotary joint shares a shafting support structure of a scanning mechanism. The rotary joint is a dual-channel coaxial rotary joint nested with the scanning mechanism, and the scanning mechanism drives the rotating part of the rotary joint to perform continuous scanning rotation. The rotary joint comprises a one-dimensional rotary scanning mechanism 1-1, a rotary part 1-2 and a fixed part 1-3, wherein the rotary part comprises an external movable shaft 4-1, an internal movable shaft 4-2 and an internal conductor 4-3, the external movable shaft, the internal movable shaft and the internal conductor are coaxially nested from outside to inside, and after the assembly is completed and the test calibration is carried out, the rotary joint is fixedly connected with a rotor flange of the one-dimensional rotary scanning mechanism through screws so as to be fixedly connected with a rotor of the one-dimensional rotary scanning mechanism, as shown in figure 5. The inner hole of the outer moving shaft and the outer circle of the inner moving shaft form a space for forming a C-band cavity for transmitting C-band radio-frequency signals, the space formed by the inner hole of the inner moving shaft forms a Ku-band cavity for transmitting C-band radio-frequency signals, and the inner conductor is supported in the Ku-band cavity through a dielectric material; specifically, the inner conductor and the supporting medium are inserted into the Ku cavity, and are fixed on a flange on the outer end face of the outer moving shaft by a fixing gasket. The fixed part is composed of an outer dead axle 6-1 and an inner dead axle 6-2, the outer dead axle and the inner diameter axle are coaxially nested and installed, and are fixedly connected with a stator of the one-dimensional rotating scanning mechanism, and the fixed part specifically comprises the following components: the fixed part is assembled and is mounted on the stator flange of the one-dimensional rotating scanning mechanism by screws after test calibration, as shown in fig. 6 and 7. When the antenna starts to rotate, the scanning mechanism is driven by the brushless direct current torque motor to continuously rotate to drive the rotating part to rotate simultaneously, so that the mutual rotation function of the rotating joints of the C channel and the Ku channel is realized.
As shown in fig. 3 and 4, in order to realize the dual-channel structure of the rotary joint, the structure of the rotary joint is divided into an outer layer, a middle layer and an inner layer, the outer layer space region is a C radio frequency channel region, the inner layer space region is a Ku radio frequency channel region, and the middle layer structure is used as the outer layer of the C rotary joint and also used as the inner layer of the Ku rotary joint; therefore, the structural design of the C/Ku double-channel rotary joint is realized, and the inner conductor of the Ku rotary joint adopts a coaxial line form.
After the structure is assembled, an electrical property test, a standing wave performance and an insertion loss performance test in a thermal vacuum state are carried out.
Preferably, a gap is present between an end surface of the rotating part and an end surface of the fixed part, thereby forming a lug space between the rotating part and the fixed part. The fixed part and the rotating part of the rotary joint are respectively arranged on a stator flange and a rotor flange of the one-dimensional rotary scanning mechanism, and the axial size is adjusted by adjusting the gasket so as to ensure that the value range of the gap is 0.27-0.33 mm.
Preferably, the carbon-carbon composite inner conductor is supported in the Ku cavity through a dielectric material.
Preferably, the dielectric material is a polyimide dielectric material.
Preferably, the end part of the inner conductor is fixed with the inner moving shaft shell in a gluing mode.
Preferably, the inner conductor is made of a carbon-carbon composite material with high thermal conductivity, low expansion and high electrical conductivity and surface metallization, and is an inner conductor with a zero expansion temperature coefficient. Preferably, the inner conductor has a long-axis-diameter ratio structure, and in a specific embodiment of the present invention, the axis-diameter ratio can reach 76.
Preferably, the process for performing surface metallization by using the C/C composite material as a microwave transmission medium comprises the following steps:
carrying out structural processing and forming on the C/C composite material;
carrying out vacuum carburization treatment on the surface of the C/C composite material after processing and forming;
and carrying out metallization treatment on the surface of the C/C composite material after the vacuum carburization treatment by adopting a vacuum sputtering process.
C/C processing and forming, and surface carbon deposition of the formed product in a vacuum state can improve the compactness and the surface roughness of the product. The surface metallization of a vacuum sputtering gold film is carried out on the product by utilizing a physical vapor deposition process method, so that the carbon-carbon (C/C) composite material with zero expansion and high heat conductivity can be obtained. In one embodiment of the present invention, the surface metallization is gold plating.
The carbon-carbon (C/C) composite material which is a zero-expansion high-heat-conductivity structural material is used as a microwave transmission medium, so that the problems that the satellite-borne coaxial dual-channel rotary joint is poor in heat dissipation capability and cannot meet the standing-wave performance of the antenna due to thermal deformation are solved.
In the invention, since the C/C composite material is a porous material, the porosity greatly influences the surface roughness of the product, so that the insertion loss parameter of rotation is increased, and although carbon is a conductive material, the conductivity of the carbon is far lower than that of a metal material. In order to further reduce the insertion loss performance and obtain higher conductivity, a carbon deposition + surface metallization method is innovatively provided to obtain the electrical property similar to that of metal.
Preferably, the C-band signal is transmitted by means of a waveguide and by means of a cable via a TNC connector.
Preferably, the one-dimensional scanning mechanism comprises a brushless direct-current torque motor, a rotary transformer, a bearing and a supporting structure thereof. The brushless direct-current torque motor rotor and the rotary transformer rotor are connected to a rotating shaft flange through screws, the motor stator and the rotary transformer stator are indirectly arranged on a shell flange through screws, and the stator and the rotor are supported through a pair of angular contact bearings and a deep groove ball bearing, so that one-dimensional rotation between the stator and the rotor is realized. In a specific embodiment of the invention, according to the working mode and task requirements of the dual-channel rotary joint, the one-dimensional rotary scanning mechanism is assembled, calibrated and tested according to the assembly and calibration outline of the wind and cloud third wind field measurement radar scanning mechanism and the rotary joint and the assembly process of the wind and cloud third wind field measurement radar scanning mechanism and the rotary joint.
The above description is only for the best mode of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.
Claims (11)
1. A double-channel coaxial antenna rotary joint is characterized by comprising a one-dimensional rotary scanning mechanism, a rotary part and a fixed part, wherein the rotary part comprises an external movable shaft, an internal movable shaft and an internal conductor, the external movable shaft, the internal movable shaft and the internal conductor are coaxially nested from outside to inside and are fixedly connected with a rotor of the one-dimensional rotary scanning mechanism, a space formed by an inner hole of the external movable shaft and an outer circle of the internal movable shaft forms a C-band cavity for transmitting C-band radio-frequency signals, a space formed by an inner hole of the internal movable shaft forms a Ku-band cavity for transmitting the C-band radio-frequency signals, and the internal conductor is supported in the Ku cavity through a dielectric material; the fixed part consists of an outer dead shaft and an inner dead shaft, wherein the outer dead shaft and the inner diameter shaft are coaxially nested and are fixedly connected with a stator of the one-dimensional rotating scanning mechanism.
2. The dual-channel coaxial antenna rotary joint according to claim 1, wherein a gap is formed between the end surface of the rotary part and the end surface of the fixed part, thereby forming a choke space between the rotary part and the fixed part.
3. The dual-channel coaxial antenna rotary joint as claimed in claim 2, wherein the gap has a value in the range of 0.27mm to 0.33mm.
4. The dual-channel coaxial antenna rotary joint as claimed in claim 1, wherein the carbon-carbon composite inner conductor is supported in the Ku cavity by a dielectric material.
5. The dual-channel coaxial antenna rotary joint as claimed in claim 4, wherein the dielectric material is polyimide dielectric material.
6. The dual-channel coaxial antenna rotary joint as claimed in claim 1, wherein the end of the inner conductor is fixed to the inner shaft housing by gluing.
7. The dual-channel coaxial antenna rotary joint as claimed in claim 1, wherein the inner conductor is made of carbon-carbon composite material.
8. The dual-channel coaxial antenna rotary joint of claim 1, wherein the inner conductor is formed by:
s1, carrying out structural processing and forming on the C/C composite material;
s2, carrying out vacuum carburization treatment on the surface of the machined and molded C/C composite material;
and S3, carrying out surface metallization treatment on the surface of the C/C composite material subjected to the vacuum carburization treatment by adopting a vacuum sputtering process.
9. The dual-channel coaxial antenna rotary joint as claimed in claim 1, wherein the inner conductor is made of a gold-plated carbon-carbon composite material.
10. The dual-channel coaxial antenna rotary joint as claimed in claim 1, wherein the C-band signal is transmitted by means of a waveguide.
11. The dual-channel coaxial antenna rotary joint as claimed in claim 1, wherein the one-dimensional scanning mechanism comprises a brushless dc torque motor, a rotary transformer, a bearing and a supporting structure thereof. The brushless direct-current torque motor rotor and the rotary transformer rotor are connected through a rotating shaft flange, the motor stator and the rotary transformer stator are indirectly arranged on a shell flange through screws, and the stator and the rotor are supported through a pair of angular contact bearings and a deep groove ball bearing, so that one-dimensional rotation between the stator and the rotor is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210998006.7A CN115799777B (en) | 2022-08-19 | 2022-08-19 | Double-channel coaxial antenna rotary joint |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210998006.7A CN115799777B (en) | 2022-08-19 | 2022-08-19 | Double-channel coaxial antenna rotary joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115799777A true CN115799777A (en) | 2023-03-14 |
| CN115799777B CN115799777B (en) | 2024-07-09 |
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|---|---|---|---|
| CN202210998006.7A Active CN115799777B (en) | 2022-08-19 | 2022-08-19 | Double-channel coaxial antenna rotary joint |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114583419A (en) * | 2022-01-12 | 2022-06-03 | 中国电子科技集团公司第十研究所 | Capacitance type coaxial radio frequency rotary joint |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114583419A (en) * | 2022-01-12 | 2022-06-03 | 中国电子科技集团公司第十研究所 | Capacitance type coaxial radio frequency rotary joint |
| CN114583419B (en) * | 2022-01-12 | 2023-10-20 | 中国电子科技集团公司第十研究所 | Capacitive coaxial radio frequency rotary joint |
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| Publication number | Publication date |
|---|---|
| CN115799777B (en) | 2024-07-09 |
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