CN109861163B - Switching device and switching method for switching three-phase coaxial superconducting cable into three-core superconducting cable - Google Patents
Switching device and switching method for switching three-phase coaxial superconducting cable into three-core superconducting cable Download PDFInfo
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- CN109861163B CN109861163B CN201910044745.0A CN201910044745A CN109861163B CN 109861163 B CN109861163 B CN 109861163B CN 201910044745 A CN201910044745 A CN 201910044745A CN 109861163 B CN109861163 B CN 109861163B
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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Abstract
The invention provides a switching device and a switching method for switching a three-phase coaxial superconducting cable to a three-core superconducting cable, belonging to the technical field of superconducting cable switching, and comprising a box body which is oppositely provided with a three-phase coaxial superconducting cable interface and a three-core superconducting cable interface; the side wall provided with the three-core superconducting cable interface is provided with a three-core superconducting cable return pipe interface; the bottom of the box body is fixedly provided with a supporting plate, and the top of the supporting plate is uniformly and equidistantly provided with a three-phase wiring positioning port and a Dewar pipe drainage port opposite to the three-core superconducting cable return pipe interface; the three-phase coaxial superconducting cable interface is as high as the three-core superconducting cable interface, and the height of the three-core superconducting cable return pipe interface is lower than that of the three-core superconducting cable interface. The invention forms stable physical electrical spacing, avoids accidents of reducing discharge of clear distance, damage of joints and the like caused by external oscillation and the like, keeps enough electrical distance between the fluid connecting pipe and the three-phase electrical connection, prevents short circuit or discharge accidents, and is safe to use.
Description
Technical Field
The invention relates to the technical field of superconducting cable switching, in particular to a switching method of a switching device for switching a three-phase coaxial superconducting cable into a three-core superconducting cable.
Background
The high-temperature superconducting cable has the advantages of low line loss, large transmission capacity, small occupied space of a corridor, environmental friendliness and the like. The superconducting power transmission technology which comprehensively considers a plurality of factors such as continuous increase of power energy demand, enhancement of energy conservation and emission reduction demand year by year, saturation of urban power transmission and distribution corridors and the like and can simultaneously realize high-efficiency low-loss and large-capacity power transmission has unique competitive advantages in the field of future power transmission and distribution. Therefore, the high-temperature superconducting cable has wide application prospect in large-capacity power transmission aspects such as power plants, substations and urban central power distribution.
Alternating-current high-temperature superconducting cables require three phases to form a loop, and various configurations have been developed to adapt to different laying conditions, voltage and current levels. The three-phase discrete (single-core), three-core and three-phase coaxial configurations are verified by engineering demonstration projects. The three-phase coaxial type and the three-core type have the characteristics of compact structure, low consumption of strip materials, small external electromagnetic radiation and the like, and become mainstream technical schemes for application and development of the three-phase alternating current superconducting cable.
The basic configuration of the three-phase coaxial superconducting cable is that an electric insulation layer, an A-phase superconductor, an electric insulation layer, a B-phase superconductor, an electric insulation layer, a C-phase superconductor, an electric insulation layer, a shielding layer and a protective layer are wound on a flexible corrugated pipe from inside to outside. In addition, the structure also has functional layers such as a semiconductive layer, an in-phase interlayer and the like. The superconductive cable current conductor formed by the structure is arranged in the low-temperature Dewar pipe, and the flexible framework of the current conductor, the half-moon-shaped gap between the current conductor and the low-temperature Dewar pipe are used as a channel for flowing a refrigerating working medium, so that the superconductor is stably cooled to be within an operating temperature range.
The basic structure of the three-core superconducting cable is that a single-phase superconducting layer, an insulating layer and a protective layer are wound on a flexible framework (a corrugated pipe or a thin copper wire) in sequence. Three superconductive cable electrified conductors with the same structure are twisted together according to a certain angle and are placed in the low-temperature Dewar pipe together. The space between the three cores and the inner wall of the low-temperature Dewar pipe is the only channel for the flowing of the refrigerating working medium, so the three cores are generally provided with a special liquid nitrogen return pipe to realize the closed circulation of the refrigerating working medium.
When the superconducting alternating current cables are used on a large scale and are interconnected, the problem of switching of the superconducting cables with different configurations is inevitable.
Disclosure of Invention
The present invention is directed to solving the above-mentioned problems of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
on one hand, the switching device for switching the three-phase coaxial superconducting cable to the three-core superconducting cable comprises a box body, wherein a three-phase coaxial superconducting cable interface is arranged on one side wall of the box body, and a three-core superconducting cable interface is arranged on the other side wall, opposite to the three-phase coaxial superconducting cable interface, of the box body; the side wall provided with the three-core superconducting cable interface is provided with a three-core superconducting cable return pipe interface;
the bottom of the box body is fixedly provided with a supporting plate, the top of the supporting plate is uniformly provided with three-phase wiring positioning ports at equal intervals, and the supporting plate is also provided with a Dewar pipe drainage through port opposite to the three-core superconducting cable return pipe interface;
the three-phase coaxial superconducting cable interface and the three-core superconducting cable interface have the same height, and the height of the three-core superconducting cable return pipe interface is lower than that of the three-core superconducting cable interface;
the top end of the box body is detachably provided with a top cover.
The three-phase coaxial superconducting cable interface is positioned in the middle of the side wall of the box body, and the central axis of the three-phase coaxial superconducting cable interface is coaxial with the longitudinal central axis of the box body.
The three-core superconducting cable interface is positioned on one side of a central shaft of the three-phase coaxial superconducting cable interface, and the three-core superconducting cable return pipe interface is positioned on the other side of the central shaft of the three-phase coaxial superconducting cable interface.
And sealing flanges are arranged on the three-phase coaxial superconducting cable interface, the three-core superconducting cable interface and the three-core superconducting cable return pipe interface.
The top of the box body is provided with an outer folded edge, the outer folded edge and the top cover are both provided with bolt holes, and the top cover is detachably connected to the top of the box body through the matching of the bolt holes and the bolts.
The side wall of the box body, the pipe wall of the three-phase coaxial superconducting cable interface, the pipe wall of the three-core superconducting cable interface and the pipe wall of the three-core superconducting cable return pipe interface are all composed of an outer shell, a heat insulation layer and an inner shell.
The outer shell with the inner shell is made by stainless steel material, the heat insulation layer includes the multilayer aluminium foil paper, packs between the adjacent aluminium foil paper and has the glass silk fibre.
The thickness of the supporting plate is 10-20 mm.
The support plate is made of an epoxy resin material.
In another aspect, the present invention provides a method for switching a three-phase coaxial superconducting cable and a three-core superconducting cable by using the apparatus described above, comprising the steps of:
the three-phase coaxial superconducting cable extends into the box body from a three-phase coaxial superconducting cable interface, a three-phase superconductor and a Dewar pipe of the three-phase coaxial superconducting cable are peeled off, and the three-phase superconductor is respectively welded on three connecting terminals;
extending a three-core superconducting cable into the box body from a three-core superconducting cable interface, untwisting three-core superconductors of the three-core superconducting cable, respectively connecting the three-core superconductors with three-phase superconductors of the three-phase coaxial superconducting cable, and respectively clamping the three-core superconductors in the three-phase wiring positioning port;
the return pipe of the three-core superconducting cable extends into the box body from the interface of the return pipe of the three-core superconducting cable, and is connected with the Dewar pipe by a metal fluid connecting pipe which penetrates through the drainage port of the Dewar pipe.
The invention has the beneficial effects that: the structure is simple, the use is safe and convenient, and the cost is low; the three-phase electric connection is positioned on the same plane, and the three-phase electric connection is respectively placed in the three-phase cable position positioning openings after wiring to form a stable physical electric distance, so that accidents of reducing discharge of the clear distance, damaging the joint and the like caused by external vibration and the like are avoided; the fluid connecting pipe is of a metal structure, is positioned at the lower part of the electric connection plane, and keeps enough electric distance with the three-phase electric connection, so that accidental short circuit or discharge fault is prevented.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a structural view of a device for transferring a three-phase coaxial superconducting cable to a three-core superconducting cable according to an embodiment of the present invention.
Fig. 2 is a diagram illustrating a state after the switching by the switching apparatus for switching the three-phase coaxial superconducting cable to the three-core superconducting cable according to the embodiment of the present invention.
Wherein: 1-a box body; 2-a three-phase coaxial superconducting cable interface; 3-three-core superconducting cable interface; 4-three-core superconducting cable return pipe interface; 5-a support plate; 61. 62, 63-three-phase wiring positioning port; 7-Dewar tube drainage port; 8-sealing the flange; 9-folding the outer edge; 10-bolt hole; 11-a three-phase coaxial superconducting cable; 12. 13, 14-three-phase superconductor; 15-a dewar tube; 16. 17, 18-terminal; 19-a three-core superconducting cable; 20. 21, 22-three-core superconductor; 23-metal fluid connection pipe; 24-a three-core superconducting cable return pipe; 25-connector.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or modules having the same or similar functionality throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or modules, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, modules, and/or groups thereof.
It should be noted that, unless otherwise explicitly stated or limited, the terms "connected" and "fixed" and the like in the embodiments of the present invention are to be understood in a broad sense and may be fixedly connected, detachably connected, or integrated, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, connected between two elements, or in an interaction relationship between two elements, unless explicitly stated or limited. Specific meanings of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
For the convenience of understanding of the embodiments of the present invention, the following description will be further explained by taking specific embodiments as examples with reference to the drawings, and the embodiments are not to be construed as limiting the embodiments of the present invention.
It will be understood by those of ordinary skill in the art that the figures are merely schematic representations of one embodiment and that the elements or devices in the figures are not necessarily required to practice the present invention.
Example one
As shown in fig. 1, a first embodiment of the present invention provides a device for transferring a three-phase coaxial superconducting cable to a three-core superconducting cable, the device including a box 1, a three-phase coaxial superconducting cable connector 2 being disposed on one side wall of the box 1, and a three-core superconducting cable connector 3 being disposed on the other side wall of the box 1 opposite to the three-phase coaxial superconducting cable connector 2; and a three-core superconducting cable return pipe connector 4 is arranged on the side wall provided with the three-core superconducting cable connector 3.
The fixed backup pad 5 that is equipped with in box 1 bottom, the even equidistant three-phase wiring location mouth 61, 62, 63 that is equipped with in top of backup pad 5, still be equipped with on backup pad 5 with the dewar pipe drainage opening 7 that three-core superconducting cable back flow pipe interface 4 is relative. The supporting plate 5 is made of low-temperature epoxy resin material such as G10, is vertically arranged in the middle of the box body 1 and slightly deviates to the position of the three-core type superconducting cable interface, has the thickness of 10-20mm, and has the height which is equal to or slightly higher than the central positions of the three-phase coaxial superconducting cable interface 2 and the three-core superconducting cable interface 3. The dewar pipe drainage port 7 in the three-phase coaxial superconducting cable is opposite to the three-core type superconducting cable return pipe interface 4 in height and horizontal position, and the radius of the opening is larger than the pipe outer diameter of the three-core type superconducting cable return pipe interface 4. The three-phase wiring positioning openings 61, 62 and 63 are three semicircular notches symmetrically formed in the upper end of the supporting plate 5, and the gap distance between the notches and the side wall of the box body 1 are determined by technicians according to the actual electrical distance. The depth of the gap is determined by the physical dimension of the single-phase superconductor, preferably 50-80% of the physical dimension of the single-phase superconductor.
The top end of the box body 1 is detachably provided with a top cover (not shown in the attached drawings).
Specifically, the top of the box body 1 is provided with an outer folded edge 9, the outer folded edge 9 and the top cover are both provided with bolt holes 10, and the top cover is detachably connected to the top of the box body 1 through the bolt holes 10 and the bolts.
The three-phase coaxial superconducting cable interface 2 is positioned in the middle of the side wall of the box body 1, and the central axis of the three-phase coaxial superconducting cable interface is coaxial with the longitudinal central axis of the box body 1.
The three-core superconducting cable interface 3 is located on one side of the central axis of the three-phase coaxial superconducting cable interface 2, and the three-core superconducting cable return pipe interface 4 is located on the other side of the central axis of the three-phase coaxial superconducting cable interface 2.
The side wall of the box body 1, the pipe wall of the three-phase coaxial superconducting cable connector 2, the pipe wall of the three-core superconducting cable connector 3 and the pipe wall of the three-core superconducting cable return pipe connector 4 are all composed of an outer shell, a heat insulation layer and an inner shell, the outer shell and the inner shell are made of stainless steel materials, the heat insulation layer comprises multiple layers of aluminum foil paper, and glass fiber is filled between every two adjacent layers of aluminum foil paper to form a heat-insulation low-temperature constant-temperature system.
Example two
As shown in fig. 2, an embodiment of the present invention provides a method for switching a three-phase coaxial superconducting cable and a three-core superconducting cable by using the apparatus according to the first embodiment, including the following steps:
with reference to fig. 1, a three-phase coaxial superconducting cable 11 is extended into a box 1 from a three-phase coaxial superconducting cable interface 2, three- phase superconductors 12, 13 and 14 and a dewar tube 15 of the three-phase coaxial superconducting cable 11 are peeled off, and the three- phase superconductors 12, 13 and 14 are respectively welded on three connecting terminals 16, 17 and 18;
extending a three-core superconducting cable 19 into a box body 1 from a three-core superconducting cable interface 3, untwisting three-core superconductors 20, 21 and 22 of the three-core superconducting cable 19, respectively connecting the three-core superconductors with three- phase superconductors 12, 13 and 14 of the three-phase coaxial superconducting cable, and respectively clamping the three-core superconducting cable in three-phase connection positioning ports 61, 62 and 63;
the return pipe 24 of the three-core superconducting cable extends into the box body 1 from the return pipe connector 4 of the three-core superconducting cable, and is connected with the Dewar pipe 15 by the metal fluid connecting pipe 23 penetrating through the Dewar pipe drainage connector 7.
Specifically, after the three-phase coaxial superconducting cable 11 enters the box body 1, the coaxial three-phase and flexible framework dewar pipe 15 is peeled off, and each phase of superconductor (namely, the three- phase superconductors 12, 13 and 14) is respectively welded on the connecting terminals (16, 17 and 18); similarly, after the three-core superconducting cable 19 enters the tank 1, the three-core superconductors 20, 21, 22 are untwisted. The three-core superconductors 20, 21 and 22 of the three-core superconducting cable are respectively connected with the three-phase superconductor of the three-phase coaxial superconducting cable through a connector 25 in a welding mode, and the welded part is protected and fixed by a copper clamp after welding. The former dewar pipe 15 of the three-phase coaxial superconducting cable 11 is connected to a three-core superconducting cable return pipe 24 via a fluid connection pipe 23.
Among the electric connection and the fluid coupling of above-mentioned three-phase conductor, three-phase electric connection is located the coplanar to place respectively in three-phase cable position fixed port (being locating port 61, 62, 63) after the wiring, form stable physics electric interval, avoid causing clear distance reduction accident such as discharging, joint damage because of reasons such as external shock. The fluid connection pipe 23 is of a metal structure, is located at the lower part of the electrical connection plane, and maintains a sufficient electrical distance with the three-phase electrical connection, thereby preventing accidental short circuit or discharge fault.
In summary, the embodiment of the present invention solves the problem of electrical and fluid switching between the three-phase coaxial superconducting cable and the three-core superconducting cable by the apparatus for switching between the three-phase coaxial superconducting cable and the three-core superconducting cable, and has the advantages of simple structure, simple operation method, and easy processing and manufacturing of the apparatus.
Those of ordinary skill in the art will understand that: the components in the device in the embodiment of the present invention may be distributed in the device in the embodiment according to the description of the embodiment, or may be correspondingly changed in one or more devices different from the embodiment. The components of the above embodiments may be combined into one component, or may be further divided into a plurality of sub-components.
The above description is only for the preferred embodiment 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. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. A switching device for switching a three-phase coaxial superconducting cable to a three-core superconducting cable is characterized in that: the three-phase coaxial superconducting cable connector comprises a box body (1), wherein a three-phase coaxial superconducting cable connector (2) is arranged on one side wall of the box body (1), and a three-core superconducting cable connector (3) is arranged on the other side wall, opposite to the three-phase coaxial superconducting cable connector (2), of the box body (1); the side wall provided with the three-core superconducting cable interface (3) is provided with a three-core superconducting cable return pipe interface (4);
a supporting plate (5) is fixedly arranged at the bottom of the box body (1), three-phase wiring positioning ports (61, 62 and 63) are uniformly arranged at the top of the supporting plate (5) at equal intervals, and a Dewar pipe drainage through port (7) opposite to the three-core superconducting cable return pipe connector (4) is further arranged on the supporting plate (5);
the three-phase coaxial superconducting cable interface (2) and the three-core superconducting cable interface (3) have the same height, and the height of the three-core superconducting cable return pipe interface (4) is lower than that of the three-core superconducting cable interface (3);
a top cover is detachably arranged at the top end of the box body (1);
the three-phase coaxial superconducting cable interface (2) is positioned in the middle of the side wall of the box body (1), and the central axis of the three-phase coaxial superconducting cable interface is coaxial with the longitudinal central axis of the box body (1); the three-core superconducting cable interface (3) is positioned on one side of the central shaft of the three-phase coaxial superconducting cable interface (2), and the three-core superconducting cable return pipe interface (4) is positioned on the other side of the central shaft of the three-phase coaxial superconducting cable interface (2);
sealing flanges (8) are arranged on the three-phase coaxial superconducting cable interface (2), the three-core superconducting cable interface (3) and the three-core superconducting cable return pipe interface (4);
the top of the box body (1) is provided with an outer folded edge (9), the outer folded edge (9) and the top cover are both provided with bolt holes (10), and the top cover is detachably connected to the top of the box body (1) through the matching of the bolt holes (10) and bolts;
the side wall of the box body (1), the pipe wall of the three-phase coaxial superconducting cable connector (2), the pipe wall of the three-core superconducting cable connector (3) and the pipe wall of the three-core superconducting cable return pipe connector (4) are all composed of an outer shell, a heat insulating layer and an inner shell.
2. The apparatus for switching a three-phase coaxial superconducting cable to a three-core superconducting cable according to claim 1, wherein: the outer shell with the inner shell is made by stainless steel material, the heat insulation layer includes the multilayer aluminium foil paper, packs between the adjacent aluminium foil paper and has the glass silk fibre.
3. The apparatus for switching a three-phase coaxial superconducting cable to a three-core superconducting cable according to claim 1, wherein: the thickness of the supporting plate (5) is 10-20 mm.
4. The apparatus for switching a three-phase coaxial superconducting cable to a three-core superconducting cable according to claim 3, wherein: the support plate (5) is made of an epoxy resin material.
5. A method for splicing a three-phase coaxial superconducting cable and a three-core superconducting cable using the apparatus as claimed in any one of claims 1 to 4, comprising the steps of:
the three-phase coaxial superconducting cable (11) extends into the box body (1) from the three-phase coaxial superconducting cable interface (2), the three-phase superconductors (12, 13 and 14) and the Dewar pipe (15) of the three-phase coaxial superconducting cable (11) are peeled off, and the three-phase superconductors (12, 13 and 14) are respectively welded on three wiring terminals (16, 17 and 18);
extending a three-core superconducting cable (19) into a box body (1) from a three-core superconducting cable interface (3), untwisting three-core superconductors (20, 21 and 22) of the three-core superconducting cable (19), respectively connecting the three-core superconductors with three-phase superconductors (12, 13 and 14) of the three-phase coaxial superconducting cable, and respectively clamping the three-core superconducting cable in three-phase wiring positioning ports (61, 62 and 63);
the return pipe (24) of the three-core superconducting cable extends into the box body (1) from the return pipe connector (4) of the three-core superconducting cable, and the Dewar pipe (15) is connected by a metal fluid connecting pipe (23) penetrating through the Dewar pipe drainage port (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910044745.0A CN109861163B (en) | 2019-01-17 | 2019-01-17 | Switching device and switching method for switching three-phase coaxial superconducting cable into three-core superconducting cable |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910044745.0A CN109861163B (en) | 2019-01-17 | 2019-01-17 | Switching device and switching method for switching three-phase coaxial superconducting cable into three-core superconducting cable |
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| CN109861163B true CN109861163B (en) | 2021-08-31 |
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| CN114284764B (en) * | 2020-07-31 | 2023-07-07 | 深圳供电局有限公司 | Three-phase coaxial superconducting cable terminal system and assembling method thereof |
| CN114243627B (en) * | 2021-12-16 | 2024-03-19 | 深圳供电局有限公司 | Coaxial superconductive direct current cable branch box |
| CN114242334B (en) * | 2021-12-16 | 2024-05-24 | 深圳供电局有限公司 | Intermediate joint of three-phase coaxial superconducting alternating current cable |
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| JP4593933B2 (en) * | 2004-01-22 | 2010-12-08 | 住友電気工業株式会社 | Connection structure of multiphase superconducting cable |
| DE102015007882A1 (en) * | 2015-06-22 | 2016-12-22 | Tesat-Spacecom Gmbh & Co.Kg | High voltage connections |
| CN107103958B (en) * | 2017-04-17 | 2018-09-28 | 广州市壹缆电缆实业有限公司 | A kind of hyperconductive cable |
| CN207572900U (en) * | 2017-12-15 | 2018-07-03 | 广州市科航通信科技有限公司 | A kind of station power cable connector box |
| CN109217226A (en) * | 2018-11-01 | 2019-01-15 | 日照永昌电子有限公司 | A kind of safe and reliable intelligent branch cable connecting box |
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Inventor after: Cheng Jinmin Inventor after: Dou Fei Inventor after: Qi Wanchun Inventor after: Zhang Wenjia Inventor after: Han Xingning Inventor after: Zhao Feifei Inventor after: Wang Bangzhu Inventor after: Dai Shaotao Inventor before: Cheng Jinmin Inventor before: Dou Fei Inventor before: Qi Wanchun Inventor before: Zhang Wenjia Inventor before: Han Xingning Inventor before: Zhao Feifei Inventor before: Wang Bangzhu Inventor before: Dai Shaotao |