CN111416253B - Electricity transmission rotary joint - Google Patents
Electricity transmission rotary joint Download PDFInfo
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- CN111416253B CN111416253B CN202010245787.3A CN202010245787A CN111416253B CN 111416253 B CN111416253 B CN 111416253B CN 202010245787 A CN202010245787 A CN 202010245787A CN 111416253 B CN111416253 B CN 111416253B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R39/00—Rotary current collectors, distributors or interrupters
- H01R39/64—Devices for uninterrupted current collection
- H01R39/643—Devices for uninterrupted current collection through ball or roller bearing
Abstract
The invention relates to an electricity transmission rotary joint, which comprises a main shaft, a shell, a motor, a gear ring and N conductive rolling ring groups, wherein N is more than or equal to 1; the motor drives the gear ring to rotate, the gear ring is fixedly connected with the shell, the gear ring drives the shell to rotate, the shell is a rotating part, the spindle is located inside the shell, two ends of the spindle are connected with the shell through angular contact bearings, the spindle is connected with a fixed part on the satellite body, and the N conductive rolling ring sets are located between the shell and the spindle in parallel and used for achieving an external rotor and internal fixed electric transmission structure. The main shaft is fixed, and the shell rotates, so that a plurality of rolling ring groups (namely ring body components) can be connected in series, and a plurality of solar cell arrays can be connected in series, and the solar cell array is particularly suitable for large-scale spacecrafts, such as space solar power stations.
Description
Technical Field
The invention relates to an electric transmission rotary joint, which is used in super-high-power use occasions such as manned space stations, solar space power stations and the like, and belongs to the technical field of space rolling conducting rings.
Background
The space high-power rotating electricity transmission mainly comprises two schemes of a slip ring and a rolling ring. The rolling ring has the advantages of large number of rollers, small contact resistance, small friction torque and the like, and is suitable for occasions with ultra-high power, such as manned space stations, solar space power stations and the like.
The prior retainer with a rolling ring structure adopts an idler wheel scheme, and adjacent flexible rings are spaced by the idler wheel. In order to support the idler wheel device, the inner ring is provided with a track structure fixedly connected with the inner ring, the flexible ring is in rolling contact with the idler wheel and the track, and the flexible ring and the idler wheel are required to be tightly connected in the circumferential direction to form a whole circle. Therefore, the flexible rings have high design, processing and manufacturing difficulty, low qualification rate and poor bearing capacity. In addition, the general rolling ring outgoing line scheme adopts aerospace conventional leads, so that the resistance is large, the heat dissipation of a wire harness is difficult, and the withstand voltage cannot meet the characteristic requirements.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, the electric transmission rotary joint is provided, a MW-level conductive rotary joint is developed for an on-orbit verification task of a space power station, and the requirements of ultra-high transmission power, ultra-high working voltage of 5000V, 100Nm large-torque drive and high structural rigidity strength are met.
The technical solution of the invention is as follows: an electricity transmission rotary joint comprises a main shaft, a shell, a motor, a gear ring and N conductive rolling ring groups, wherein N is more than or equal to 1;
the motor drives the gear ring to rotate, the gear ring is fixedly connected with the shell, the gear ring drives the shell to rotate, the shell is a rotating part, the spindle is located inside the shell, two ends of the spindle are connected with the shell through angular contact bearings, the spindle is connected with a fixed part on the satellite body, and the N conductive rolling ring sets are located between the shell and the spindle in parallel and used for achieving an external rotor and an internal fixed electric transmission structure.
The main shaft is of a hollow structure.
Each conductive rolling ring group comprises M parallel rolling rings, each rolling ring comprises an inner ring, an outer ring, a retainer and L flexible rings, the L flexible rings are positioned between the inner ring and the outer ring under the support of the retainer and used for realizing the electrical communication between the inner ring and the outer ring, the inner ring is fixed with the main shaft, and the outer ring is fixed with the shell; the outgoing line of the outer ring is connected with the solar cell array in series; the outgoing line of the inner ring is connected with an electric load inside the spacecraft, M is larger than or equal to 1, and L is larger than or equal to 1.
The outer ring outgoing line and the inner ring outgoing line are both made of rigid copper bar outer sleeve insulating sleeves.
The insulating sleeve is made of polyimide materials.
The rolling ring group comprises an outer ring, wherein the periphery of the outer ring is axially provided with an annular groove, outer ring outgoing lines extend out from the annular groove of the outer ring in parallel to the axis of the outer ring, and the outer ring outgoing lines of the M rolling rings are uniformly distributed on the outer side of the rolling ring assembly in the circumferential direction;
the inner periphery of the inner ring is provided with an annular groove along the axial direction, the inner ring outgoing lines extend out from the inner ring annular groove in parallel to the inner ring axis, and the inner ring outgoing lines of the M rolling rings are uniformly distributed on the inner side of the rolling ring assembly in the circumferential direction.
And heat-conducting insulating ring glue is filled in the annular grooves of the outer ring and the inner ring.
The outer ring and the inner ring of the rolling ring are opposite in circumferential direction and comprise two parallel raceways, L flexible rings are uniformly distributed on the inner circumference of each raceway, 2L flexible rings are distributed on the inner ring, a third raceway is further formed on the inner ring and is marked as a supporting raceway and is positioned between the two flexible ring raceways, the retainer is of an annular structure, the annular structure alternately forms L groove structures in the opposite direction along the axial direction at intervals of an arc section, L supporting bearings and 2L interval bearings are further arranged on the retainer, the L supporting bearings are arranged at the groove structures, the supporting bearing inner ring is fixed on the retainer groove structures by a pin shaft, and the supporting bearing outer ring is fixed in the corresponding supporting groove of the rolling ring inner ring; the spacing bearings are respectively and fixedly arranged on the arc sections between the two opposite-direction groove structures and used for limiting the peripheral direction of the flexible rings on the outer sides of the two opposite-direction groove structures from rolling randomly, a plurality of flexible rings roll around a central shaft in a planetary way in the rotation work of the rolling rings, and the revolution speeds of the plurality of flexible rings on the same raceway are not completely consistent; the inner side of the flexible ring which rotates fast pushes the outer ring of the interval bearing, the inner side of the flexible ring which rotates slow is pushed by the outer ring of the interval bearing, and the interval effect of the flexible rings is realized through the interaction of the sides, so that the serious abrasion caused by the mutual collision of the flexible rings in the same roller path is prevented.
Each interval bearing corresponds to the flexible ring one by one, and the size and the position of the bearing in the width direction correspond to the size and the position of the flexible ring in the width direction.
Compared with the prior art, the invention has the beneficial effects that:
(1) the whole machine shell and the main shaft are connected by two sets of angular contact bearings at two ends respectively, the two ends of the shaft are connected with the satellite and are fixed parts, and the shell is connected with the solar cell array and is a rotating part: the main shaft is fixed, and the shell rotates to realize the series connection of a plurality of rolling rings (namely rotary joints) and a plurality of solar cell arrays, and is particularly suitable for large-scale spacecrafts, such as space solar power stations;
(2) the invention adopts the rigid copper bar outgoing line and designs the insulating sleeve structure, thereby solving the problems of large heat generation, difficult heat dissipation, voltage resistance which does not meet the national military standard and the like in the transmission process of high voltage and ultrahigh power.
(3) The invention designs a brand new flexible ring support retainer structure scheme, which has good manufacturability and good resistance mechanical property, and solves the problems of large processing and manufacturing difficulty and poor manufacturability of the traditional idler wheel scheme.
Drawings
FIG. 1 is an overall structure of an electrical transmission rotary joint according to an embodiment of the present invention;
fig. 2(a) is an integrated structure of a plurality of rolling rings of a rolling ring assembly (ring body assembly) according to an embodiment of the present invention;
FIG. 2(b) is a cross-sectional view of a roller ring assembly (ring body assembly) according to an embodiment of the present invention;
FIG. 3 is a cage assembly configuration according to an embodiment of the present invention;
FIG. 4 is an enlarged partial cross-sectional view of a rolling ring according to an embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following examples.
As shown in fig. 1, the invention provides an electric transmission rotary joint, which comprises a main shaft, a shell, a motor, a gear ring and N conductive rolling ring groups, wherein N is more than or equal to 1.
The motor drives the gear ring to rotate, the gear ring is fixedly connected with the shell, the gear ring drives the shell to rotate, the shell is a rotating part, the main shaft is located inside the shell, the shell and the main shaft are connected through two sets of angular contact bearings at two ends respectively, two ends of the shaft are connected with the fixed part on the satellite body, and the N conductive rolling ring sets are located between the shell and the main shaft in parallel and are used for achieving an external rotor and internal fixed electric transmission structure. The main shaft is fixed, and the shell can rotate to realize the series connection of a plurality of rolling rings (namely rotary joints) and a plurality of solar cell arrays, and is particularly suitable for large-scale spacecrafts, such as space solar power stations.
Preferably, the main shaft is a hollow structure. The hollow space of the main shaft can be used for installing transmission cables for spacecrafts, and is particularly suitable for large series connection spacecraft structures. Both ends of the hollow shaft can be connected with a truss structure of the space power station system.
The drive adopts a layout structure of a large gear ring and a bias motor, and realizes the drive and electricity transmission modular design.
As shown in fig. 2(a) and 2(b), each conductive rolling ring group includes M rolling rings connected in parallel, each rolling ring further includes an inner ring, an outer ring, a retainer and L flexible rings, the L flexible rings are located between the inner ring and the outer ring under the support of the retainer, and are used for realizing the electrical communication between the inner ring and the outer ring, the inner ring is fixed with the main shaft, and the outer ring is fixed with the housing; the outgoing line of the outer ring is connected with the solar cell array in series; the outgoing line of the inner ring is connected with an electric load inside the spacecraft, M is larger than or equal to 1, and L is larger than or equal to 1.
The outer ring outgoing line and the inner ring outgoing line are both made of rigid copper bar outer sleeve insulating sleeves. The conductor structure can be customized according to product layout, and the single rigid copper bar has a larger sectional area than a conventional conductor of a lead wire, so that the resistance of the lead-out wire is reduced, and the heating is reduced; the insulating sleeve is made of polyimide materials, so that the insulating strength is high, and high-voltage application is convenient to realize.
The rolling ring group comprises an outer ring, wherein the periphery of the outer ring is axially provided with an annular groove, outer ring outgoing lines extend out from the annular groove of the outer ring in parallel to the axis of the outer ring, and the outer ring outgoing lines of the M rolling rings are uniformly distributed on the outer side of the rolling ring assembly in the circumferential direction;
the inner periphery of the inner ring is provided with an annular groove along the axial direction, the inner ring outgoing lines extend out from the inner ring annular groove in parallel to the inner ring axis, and the inner ring outgoing lines of the M rolling rings are uniformly distributed on the inner side of the rolling ring assembly in the circumferential direction. The outgoing lines distributed circumferentially reduce the concentration of wire harnesses and increase the heat dissipation area.
Preferably, heat conduction insulating ring glue is filled in the annular grooves of the outer ring and the inner ring, so that the insulating property between the wires is further enhanced, the annular grooves can be used as auxiliary supports of the outgoing lines, and the mechanical resistance is improved.
The flexible ring is adopted between the rotating part and the fixed part of the rolling ring to realize current and power transmission. In order to reduce contact resistance, reduce heat generation and improve electrical transmission reliability, the number of the flexible rolling rings should be increased as much as possible. During the rotation work of the rolling ring, the plurality of flexible rings perform planetary rolling around the central shaft. Due to errors and sliding in the actual process, the flexible rings finally collide and interfere with each other in the continuous operation process to cause serious abrasion. The retainer needs to be designed to fix the interval.
At present, different spacing schemes are provided for rolling ring retainers of NASA, domestic eight houses, five houses and other units. But has the problems of poor manufacturability, heavy weight and the like. According to the requirements, the rolling ring comprising the novel flexible roller spacing device is designed, so that the roller spacing is realized, and the problems of support of the retainer, rigidity of the retainer, manufacturability and the like are solved.
As shown in fig. 3 and 4, the circumferential opposite positions of the outer ring and the inner ring of the rolling ring include two parallel raceways, L flexible rings are uniformly distributed on the inner circumference of each raceway, and 2L flexible rings are mounted between the raceways of the inner ring and the outer ring to realize electrical communication. The inner ring is also provided with a third raceway marked as a supporting raceway and positioned between the two flexible ring raceways, and the retainer assembly is arranged on the middle raceway. The novel metal retainer separates the flexible rollers and supports the retainer and the flexible ring by adopting miniature bearings with different specifications. The retainer adopts the special-shaped annular structure in the circumferential direction, the stress is uniform, the thickness of the ring body is reduced, and the weight of the whole machine is effectively reduced. The special-shaped annular structure alternately forms L groove structures in total at intervals of an arc section in the axial direction in the opposite direction, L supporting bearings and 2L interval bearings are further arranged on the retainer, the L supporting bearings are arranged at the groove structures, the supporting bearing inner ring is fixed on the retainer groove structures through pin shafts, the supporting bearing outer ring is fixed in corresponding supporting grooves of the rolling ring inner ring, the supporting bearings realize the fixation and the support of the retainer, and under the severe mechanical environments such as vibration impact, the inertia force of the retainer is transmitted to the rolling ring inner ring and the main shaft through the supporting bearings to protect the flexible ring from being stressed; the spacing bearings are respectively and fixedly arranged on the arc sections between the two opposite-direction groove structures and used for limiting the peripheral direction of the flexible rings on the outer sides of the two opposite-direction groove structures from rolling randomly, a plurality of flexible rings roll around a central shaft in a planetary way in the rotation work of the rolling rings, and the revolution speeds of the plurality of flexible rings on the same raceway are not completely consistent; the inner side of the flexible ring which rotates fast pushes the outer ring of the interval bearing, the inner side of the flexible ring which rotates slow is pushed by the outer ring of the interval bearing, and the interval effect of the flexible rings is realized through the interaction of the sides, so that the serious abrasion caused by the mutual collision of the flexible rings in the same roller path is prevented.
Each interval bearing corresponds to the flexible ring one by one, and the size and the position of the bearing in the width direction correspond to the size and the position of the flexible ring in the width direction. During actual work, the rolling rings rotate continuously, and the revolution speeds of a plurality of flexible rings in the same raceway are not completely consistent; the inner side of the flexible ring which rotates fast pushes the outer ring of the interval bearing, the inner side of the flexible ring which rotates slow is pushed by the outer ring of the interval bearing, and the interval effect of the flexible rings is realized through the interaction of the sides, so that the serious abrasion caused by the mutual collision of the flexible rings in the same roller path is prevented.
In one embodiment of the invention, each roller ring comprises 12 flexible rings, 12 spacer bearings and 6 support bearings. 6 flexible rings are uniformly arranged on the inner circumference of each roller path, 12 spacing bearings are respectively positioned on two sides of the retainer, two spacing bearings are in a group, the inner ring is fixed on two sides of the retainer by a pin shaft, the outer ring is in a free state, 6 supporting bearings are positioned in the center of the width direction of the retainer, the center of mass of the retainer assembly is positioned in the center of the width direction and is coplanar with the supporting bearings, and the mechanical property is improved.
The novel flexible roller spacing device is designed on the rolling ring, so that the problems of support of the retainer, rigidity of the retainer, manufacturability and the like are solved while the spacing of the rollers is realized.
(1) Integral structure of retainer
The functional principle is as follows: the retainer adopts an aluminum alloy rigid structure, and the retainer is provided with pins which penetrate through the flexible ring. When the flexible roller is far away from the balance position, the flexible roller is separated by the spacing function.
Structural layout: in order to fully utilize the retainer and increase the number of the flexible rings as much as possible, the spacing bearings are positioned on two sides of the retainer to simultaneously support two rows of flexible rollers.
Micro-bearing: in order to reduce the sliding friction between the spacing pin and the inner wall of the flexible roller, the pin is sleeved with the miniature bearing, so that the resistance moment is reduced, and the reliability is improved.
(2) Cage support bearing
Because the retainer adopts a rigid aluminum alloy structure, the rigidity and the strength of the flexible roller are weaker. The support device is required to be arranged separately to fix and support the retainer. As shown in fig. 3, the bearing structure is designed to fix and support the shaft holder.
The structure of the retainer is optimized, and the design goal is realized: 1) the retainer supporting bearings and the flexible rollers are distributed circumferentially on the radial approximate size, so that the radial volume of the structure is reduced, and the large hollow structure of the whole machine is realized; 2) the axial special-shaped petal structure of the retainer enables the support bearings to be positioned on two sides of the retainer and to be positioned on the same plane; 3) the center of mass of the retainer structure and the spacing bearing structure is coplanar with the support bearing. The whole structure is compact, and the structural bearing force is optimized.
(3) Raceway design
The race ring body raceway is designed as shown in fig. 4. The retainer supports the bearing raceway and the flexible roller raceway to separate, so that the bearing raceway is ensured not to influence the electric transmission raceway, and the reliability is improved.
The invention develops a MW-level conductive rotary joint according to an on-orbit verification task for a space power station, solves the requirements of ultra-high transmission power, ultra-high working voltage of 5000V, large torque drive and high structural rigidity and strength, and also mechanically requires a large hollow structure to adapt to the layout scheme of a space power station, aiming at the key problems, the solution comprises the following steps:
1) each ring adopts two rows of rollers, so that the number of the rollers is increased, the contact resistance is reduced, and the heat emission is reduced;
2) the scheme of customizing the rigid copper bar is used as a ring body outgoing line, so that the resistance of the outgoing line is effectively reduced, and the heating is reduced;
3) positive and negative isolation is adopted among the ring bodies, and the voltage resistance is improved in a thickening insulation mode; the outgoing lines adopt a scheme of customizing a polyimide insulating sleeve and insulating encapsulation to simultaneously realize insulating reinforcement and mechanical reinforcement, so that the requirement of ultrahigh working voltage is met;
4) a novel flexible roller spacing retainer is designed, and small bearings of different specifications are adopted to support the retainer and the flexible roller respectively, so that the weight is reduced, and the reliability is improved.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (5)
1. An electricity transmission rotary joint is characterized by comprising a main shaft, a shell, a motor, a gear ring and N conductive rolling ring groups, wherein N is more than or equal to 1;
the motor drives the gear ring to rotate, the gear ring is fixedly connected with the shell, the gear ring drives the shell to rotate, so that the shell is a rotating part, the main shaft is positioned in the shell, two ends of the main shaft are connected with the shell through angular contact bearings, the main shaft is connected with a fixed part on the satellite body, and the N conductive rolling ring groups are positioned between the shell and the main shaft in parallel and used for realizing an external rotor and internal fixed electric transmission structure;
each conductive rolling ring group comprises M parallel rolling rings, each rolling ring comprises an inner ring, an outer ring, a retainer and L flexible rings, the L flexible rings are positioned between the inner ring and the outer ring under the support of the retainer and used for realizing the electrical communication between the inner ring and the outer ring, the inner ring is fixed with the main shaft, and the outer ring is fixed with the shell; the outgoing line of the outer ring is connected with the solar cell array in series; the outgoing line of the inner ring is connected with an electric load inside the spacecraft, M is more than or equal to 1, and L is more than or equal to 1;
the outer ring and the inner ring of the rolling ring are opposite in circumferential direction and comprise two parallel rolling ways, L flexible rings are uniformly distributed on the inner circumference of each rolling way, 2L flexible rings are arranged in total, the inner ring is also provided with a third rolling way which is marked as a supporting rolling way and is positioned between the two flexible ring rolling ways, the retainer is of an annular structure, the annular structure alternately forms L groove structures in total along the axial direction at intervals of arc sections in opposite directions, L supporting bearings and 2L interval bearings are also arranged on the retainer, the L supporting bearings are arranged at the groove structures, the inner rings of the supporting bearings are fixed on the groove structures of the retainer by pin shafts, and the outer rings of the supporting bearings are fixed in the corresponding supporting rolling ways of the inner ring of the rolling ring; the spacing bearings are respectively and fixedly arranged on the arc sections between the two opposite-direction groove structures and used for limiting the peripheral direction of the flexible rings on the outer sides of the two opposite-direction groove structures from rolling randomly, a plurality of flexible rings roll around the main shaft in a planetary manner in the rotation work of the rolling rings, and the revolution speeds of the plurality of flexible rings on the same raceway are not completely consistent; the inner side of the flexible ring which rotates fast pushes the outer ring of the interval bearing, the inner side of the flexible ring which rotates slow is pushed by the outer ring of the interval bearing, the interval effect of the flexible ring is realized through the interaction of the inner side of the flexible ring and the outer ring of the interval bearing, and the serious abrasion caused by the mutual collision of the flexible rings in the same roller path is prevented.
2. An electrical transmission rotary joint according to claim 1, wherein said main shaft is hollow.
3. The electrical transmission rotary joint of claim 1, wherein the outer ring lead wires and the inner ring lead wires are each formed from a rigid copper rod jacketed insulating sleeve.
4. An electrical transmission rotary joint as claimed in claim 3, wherein said insulative sleeve is made of a polyimide material.
5. The electrical transmission rotary joint of claim 1, wherein each spacer bearing corresponds to a compliant ring, and the bearing width dimension and position corresponds to the compliant ring width dimension and position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010245787.3A CN111416253B (en) | 2020-03-31 | 2020-03-31 | Electricity transmission rotary joint |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010245787.3A CN111416253B (en) | 2020-03-31 | 2020-03-31 | Electricity transmission rotary joint |
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| CN111416253A CN111416253A (en) | 2020-07-14 |
| CN111416253B true CN111416253B (en) | 2021-12-07 |
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| GB2622040A (en) * | 2022-08-31 | 2024-03-06 | Tethr Ltd | Improved electrical interfaces for motors |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5829986A (en) * | 1997-02-10 | 1998-11-03 | Honeybee Robotics, Inc. | Single layer, multi-channel band-gear system for rotary joint |
| CN200941524Y (en) * | 2006-08-23 | 2007-08-29 | 中国海洋石油总公司 | Closed conductive sliding ring |
| CN102163785B (en) * | 2010-12-27 | 2013-05-01 | 北京控制工程研究所 | Small-size rolling type conducting ring assembly applied to space |
| CN102141117A (en) * | 2010-12-27 | 2011-08-03 | 北京控制工程研究所 | Small-size speed reducer assembly for solar sailboard driving mechanism |
| CN104779504B (en) * | 2015-04-24 | 2017-04-05 | 上海航天测控通信研究所 | A kind of high-power rolling is confluxed loop device |
| CN104852240A (en) * | 2015-05-20 | 2015-08-19 | 中国空间技术研究院 | High-power rolling type collector ring device |
| CN105226477B (en) * | 2015-10-23 | 2017-07-28 | 九江精达检测技术有限公司 | One kind rolls electric rotation transmission device |
| CN108199240B (en) * | 2016-12-08 | 2019-09-13 | 北京金风科创风电设备有限公司 | Conducting ring assembly, conducting device and wind driven generator |
| CN209418944U (en) * | 2019-01-21 | 2019-09-20 | 深圳市晶沛电子有限公司 | A kind of conducting slip ring |
| CN110429441B (en) * | 2019-08-29 | 2020-10-16 | 上海航天电子通讯设备研究所 | Rolling type collector ring |
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