CN204706942U - Direct current system is electric supply installation and DC suppling equipment again - Google Patents
Direct current system is electric supply installation and DC suppling equipment again Download PDFInfo
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- CN204706942U CN204706942U CN201520244871.8U CN201520244871U CN204706942U CN 204706942 U CN204706942 U CN 204706942U CN 201520244871 U CN201520244871 U CN 201520244871U CN 204706942 U CN204706942 U CN 204706942U
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Abstract
The utility model discloses a kind of direct current system electric supply installation again, this direct current system again electric supply installation is connected to direct-flow distribution system and with between electric loading, comprise for when direct-flow distribution system is stopped power supply to first of electricity consumption load supplying again power supply circuits, for switch direct-flow distribution system and first again power supply circuits to the power switching circuit of electricity consumption load supplying, and for when described power switching circuit switches to second of electricity consumption load supplying the power supply circuits again.The invention also discloses a kind of DC suppling equipment, comprise direct-flow distribution system and above-mentioned direct current system electric supply installation again.The utility model can realize by electric loading in all not power-off of power switching process, ensure that direct-flow distribution system stop quotation on the exchange maintenance time do not affect downstream load electricity consumption, thus can maintenance duration be shortened, effective raising direct-flow distribution system is powered efficiency of the practice again, and can reduce the direct-flow distribution system cost of overhaul.
Description
Technical field
The utility model relates to power technique fields, particularly relates to a kind of direct current system electric supply installation and DC suppling equipment again.
Background technology
Direct-flow distribution system is the most important control of nuclear power station and logic power, and 125V direct-flow distribution system provides control power supply for all high, normal, basic compressing switch, and 48V direct-flow distribution system is that all logic control systems and actuator power.Each direct-flow distribution system is configured with two chargers and a group storage battery, ensure that under any operating mode as downstream load provides reliable and stable DC power supply.The maintenance of stopping quotation on the exchange of direct-flow distribution system, even tens pieces of mesolow cross flow trays are unavailable will to cause several pieces, downstream, the equipment in permutation or whole region is unavailable, and maintenance impact of therefore stopping quotation on the exchange is very large, has sub-load also to need to power to guarantee the continuous operation of some loads again.
At present, the flow process of powering again of standard is by all load synthesis of certain switch downstream, after using other power supply to power to downstream load, recover the electricity consumption of downstream load more one by one, the flow process recovering formal power supply is just in time contrary, and therefore each direct-flow distribution system stops quotation on the exchange to overhaul, and needs the downstream load of powering again that 2 short-time loss of power supplies will be had unavailable, and need time and the manpower of at substantial, cause direct-flow distribution system efficiency of the practice of powering again low.
Utility model content
Main purpose of the present utility model is to provide a kind of direct current system electric supply installation and DC suppling equipment again, is intended to improve direct-flow distribution system and powers efficiency of the practice again, reduce the direct-flow distribution system cost of overhaul.
In order to achieve the above object, the utility model provides a kind of direct current system electric supply installation again, described direct current system again electric supply installation is connected to direct-flow distribution system and with between electric loading, described direct current system again electric supply installation comprise for when direct-flow distribution system is stopped power supply to first of electricity consumption load supplying again power supply circuits, for switch direct-flow distribution system and first again power supply circuits to the power switching circuit of electricity consumption load supplying, and for when described power switching circuit switches to second of electricity consumption load supplying the power supply circuits again;
Described power switching circuit comprises the first path and alternate path, first path of described power switching circuit is connected between direct-flow distribution system and described electric loading, the alternate path of described power switching circuit is connected to described first again between power supply circuits and described electric loading, described second again power supply circuits be connected by electric loading with described.
Preferably, described power switching circuit comprises the first switch;
First moving contact of described first switch is connected with the described positive supply input by electric loading, and the second moving contact of described first switch is connected with the described negative supply input by electric loading; First fixed contact of described first switch is connected with the positive supply output of described direct-flow distribution system, and the second fixed contact of described first switch is connected with the negative supply output of described direct-flow distribution system; 3rd fixed contact of described first switch is connected with the positive supply output of the described first power supply circuits again, and the 4th fixed contact of described first switch is connected with the negative supply output of the described first power supply circuits again.
Preferably, described first again power supply circuits comprise DC power supply for subsequent use and second switch;
First fixed contact of described second switch is connected with the positive supply output of described DC power supply for subsequent use, and the second fixed contact of described second switch is connected with the negative supply output of described DC power supply for subsequent use;
First moving contact of described second switch is connected with the 3rd fixed contact of described first switch, and the second moving contact of described first switch is connected with the 4th fixed contact of described first switch.
Preferably, described second again power supply circuits comprise AC power, rectification module, reversible diode group and the 3rd switch;
Described rectification module is connected with described AC power, and described reversible diode group is connected between described rectification module and described 3rd switch, and described 3rd switch is connected by electric loading with described.
Preferably, described reversible diode group comprises the first diode and second diode of reverse parallel connection;
First moving contact of described 3rd switch is connected with the described positive supply input by electric loading, and the second moving contact of described 3rd switch is connected with the described negative supply input by electric loading; First fixed contact of described 3rd switch is connected with the negative electrode of described first diode, and the second fixed contact of described 3rd switch is connected with the anode of described second diode; The anode of described first diode is connected with the positive output end of described rectification module, and the negative electrode of described second diode is connected with the negative output terminal of described rectification module.
Preferably, described second again power supply circuits also comprise batteries and the 4th switch;
First moving contact of described 4th switch is connected with the positive pole of described batteries, and the second moving contact of described 4th switch is connected with the negative pole of described batteries; First fixed contact of described 4th switch is connected with the anode of described first diode, and the second fixed contact of described 4th switch is connected with the negative electrode of described second diode.
In addition, in order to achieve the above object, the utility model additionally provides a kind of DC suppling equipment, described DC suppling equipment comprises direct-flow distribution system and direct current system electric supply installation again, described direct-flow distribution system is used for electricity consumption load supplying, and described direct current system again electric supply installation is used for when described direct-flow distribution system is stopped transport to electricity consumption load supplying; Described direct current system again electric supply installation is connected to direct-flow distribution system and with between electric loading, described direct current system again electric supply installation comprise for when direct-flow distribution system is stopped power supply to first of electricity consumption load supplying again power supply circuits, for switch direct-flow distribution system and first again power supply circuits to the power switching circuit of electricity consumption load supplying, and for when described power switching circuit switches to second of electricity consumption load supplying the power supply circuits again;
Described power switching circuit comprises the first path and alternate path, first path of described power switching circuit is connected between direct-flow distribution system and described electric loading, the alternate path of described power switching circuit is connected to described first again between power supply circuits and described electric loading, described second again power supply circuits be connected by electric loading with described.
The direct current system that the utility model provides is electric supply installation and DC suppling equipment again, by power switching circuit switch direct-flow distribution system and first again power supply circuits to electricity consumption load supplying, and power switching circuit direct-flow distribution system powered and first again power supply circuits power switch time, by second again power supply circuits to electricity consumption load supplying.Thus stop power supply at direct-flow distribution system, need from direct-flow distribution system power switching be first again power supply circuits power, or restore electricity at direct-flow distribution system, need from first again power supply circuits power switching be the direct-flow distribution system process of powering, by second again power supply circuits to electricity consumption load supplying, make by electric loading in all not power-off of power switching process, ensure that direct-flow distribution system stop quotation on the exchange maintenance time do not affect downstream load electricity consumption, thus can maintenance duration be shortened, effective raising direct-flow distribution system is powered efficiency of the practice again, and the direct-flow distribution system cost of overhaul can be reduced.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the utility model direct current system electric supply installation preferred embodiment again.
The realization of the purpose of this utility model, functional characteristics and advantage, will in conjunction with the embodiments, and be described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
The utility model provides a kind of direct current system electric supply installation again.
With reference to the electrical block diagram that Fig. 1, Fig. 1 are the electric supply installation preferred embodiment again of the utility model direct current system.
In the utility model preferred embodiment, direct current system of the present utility model again electric supply installation 10 is connected to direct-flow distribution system 20 and with between electric loading 30, for being powered by electric loading 30 when described direct-flow distribution system 20 is stopped transport.Direct current system again electric supply installation 10 comprises the first power supply circuits 11, power switching circuit 12 and second power supply circuits 13 more again; Wherein, first again power supply circuits 11 for when direct-flow distribution system 20 is stopped power supply give powered by electric loading 30, power switching circuit 12 for switch direct-flow distribution system 20 and first again power supply circuits 11 to powering with electric loading 30, second again power supply circuits 13 for when described power switching circuit 12 switches to being powered by electric loading 30.
Described power switching circuit 12 comprises the first path and alternate path, first path of described power switching circuit 12 is connected between direct-flow distribution system 20 and described electric loading 30, the alternate path of described power switching circuit 12 is connected to described first again between power supply circuits 11 and described electric loading 30, described second again power supply circuits 13 be connected by electric loading 30 with described.
In the present embodiment, when direct-flow distribution system 20 normally runs, first path conducting of power switching circuit 12, by direct-flow distribution system 20 with connect by electric loading 30, now, direct-flow distribution system 20 carries out normal power supply through the first path of power switching circuit 12 to by electric loading 30.
Stop power supply at direct-flow distribution system 20, such as direct-flow distribution system 20 carries out stopping quotation on the exchange maintenance when needing to stop transport, first path of power switching circuit 12 disconnects, switch to the alternate path conducting of power switching circuit 12, from given by direct-flow distribution system 20 with electric loading 30 power switching for by first again power supply circuits 11 to being powered by electric loading 30, simultaneously, switch in alternate path turn on process being disconnected to from the first path of power switching circuit 12, second again power supply circuits 13 powered by electric loading 30.Given by direct-flow distribution system 20 with electric loading 30 power switching for by first again power supply circuits 11 to after powering by electric loading 30, second again power supply circuits 13 cut off the power supply by electric loading 30.
And, restore electricity at direct-flow distribution system 20, such as direct-flow distribution system 20 carry out stopping quotation on the exchange maintenance complete after needs rerun when restoring electricity, the alternate path of power switching circuit 12 disconnects, switch to the alternate path conducting of power switching circuit 12, from by first again power supply circuits 11 give with electric loading 30 power switching for by direct-flow distribution system 20 to being powered by electric loading 30, simultaneously, switch in the first path turn on process being disconnected to from the alternate path of power switching circuit 12, second again power supply circuits 13 powered by electric loading 30.By first again power supply circuits 11 give with electric loading 30 power switching for by direct-flow distribution system 20 to after powering by electric loading 30, second again power supply circuits 13 cut off the power supply by electric loading 30.
Thus, stop power supply at direct-flow distribution system 20, need from direct-flow distribution system 20 power switching be first again power supply circuits 11 power, or restore electricity at direct-flow distribution system 20, need from first again power supply circuits 11 power switching be direct-flow distribution system 20 power process, by second again power supply circuits 13 powered by electric loading 30, make by electric loading 30 in all not power-off of power switching process, ensure that direct-flow distribution system 20 stop quotation on the exchange maintenance time do not affect downstream load electricity consumption, thus can maintenance duration be shortened, effective raising direct-flow distribution system 20 is powered efficiency of the practice again, and direct-flow distribution system 20 cost of overhaul can be reduced.
As shown in Figure 1, described power switching circuit 12 comprises the first K switch 1; Preferably, this first K switch 1 is drawer switch, and the first K switch 1 can also be double-point double-throw switch, and the first K switch 1 comprises two moving contacts and four fixed contacts.
First moving contact of described first K switch 1 is connected with the described positive supply input by electric loading 30, and the second moving contact of described first K switch 1 is connected with the described negative supply input by electric loading 30; First fixed contact of described first K switch 1 is connected with the positive supply output of described direct-flow distribution system 20, and the second fixed contact of described first K switch 1 is connected with the negative supply output of described direct-flow distribution system 20; 3rd fixed contact of described first K switch 1 is connected with the positive supply output of the described first power supply circuits 11 again, and the 4th fixed contact of described first K switch 1 is connected with the negative supply output of the described first power supply circuits 11 again.
As shown in Figure 1, described first again power supply circuits 11 comprise DC power supply 111 for subsequent use and second switch K2; Preferably, this second switch K2 is double-pole single throw, comprises two moving contacts and two fixed contacts.
First fixed contact of described second switch K2 is connected with the positive supply output of described DC power supply 111 for subsequent use, and second fixed contact of described second switch K2 is connected with the negative supply output of described DC power supply 111 for subsequent use; First moving contact of described second switch K2 is connected with the 3rd fixed contact of described first K switch 1, and the second moving contact of described first K switch 1 is connected with the 4th fixed contact of described first K switch 1.
Those skilled in the art should be understood that, the fixed contact of second switch K2 and the annexation of moving contact can be exchanged, namely the fixed contact of second switch K2 is connected with the first K switch 1, and the moving contact of second switch K2 is connected with DC power supply 111 for subsequent use, and this is not restricted.
As shown in Figure 1, described second again power supply circuits 13 comprise AC power 131, rectification module 132, reversible diode group 133 and the 3rd K switch 3; Preferably, this AC power 131 is the AC power of three-phase 380V, and the 3rd K switch 3 is double-pole single throw, comprises two moving contacts and two fixed contacts.
Described rectification module 132 is connected with described AC power 131, and described reversible diode group 133 is connected between described rectification module 132 and described 3rd K switch 3, and described 3rd K switch 3 is connected by electric loading 30 with described.
Particularly, described reversible diode group 133 comprises the first diode D1 and the second diode D2 of reverse parallel connection.
First moving contact of described 3rd K switch 3 is connected with the described positive supply input by electric loading 30, and the second moving contact of described 3rd K switch 3 is connected with the described negative supply input by electric loading 30; First fixed contact of described 3rd K switch 3 is connected with the negative electrode of described first diode D1, and the second fixed contact of described 3rd K switch 3 is connected with the anode of described second diode D2; The anode of described first diode D1 is connected with the positive output end of described rectification module 132, and the negative electrode of described second diode D2 is connected with the negative output terminal of described rectification module 132.
Those skilled in the art should be understood that, the fixed contact of the 3rd K switch 3 and the annexation of moving contact can be exchanged, namely the fixed contact of the 3rd K switch 3 is connected with by electric loading 30, and the moving contact of the 3rd K switch 3 is connected with reversible diode group 133, and this is not restricted.
As shown in Figure 1, described second again power supply circuits 13 also comprise batteries E and the 4th K switch 4; Preferably, the 4th K switch 4 is double-pole single throw, comprises two moving contacts and two fixed contacts.
First moving contact of described 4th K switch 4 is connected with the positive pole of described batteries E, and the second moving contact of described 4th K switch 4 is connected with the negative pole of described batteries E; First fixed contact of described 4th K switch 4 is connected with the anode of described first diode D1, and the second fixed contact of described 4th K switch 4 is connected with the negative electrode of described second diode D2.
Those skilled in the art should be understood that, the fixed contact of the 4th K switch 4 and the annexation of moving contact can be exchanged, namely the fixed contact of the 4th K switch 4 is connected with batteries E, and the moving contact of the 4th K switch 4 is connected with reversible diode group 133, and this is not restricted.
As shown in Figure 1, the utility model direct current system again electric supply installation 10 operation principle specifically describe as follows:
When direct-flow distribution system 20 normally runs, first path conducting of power switching circuit 12, namely the first moving contact of the first K switch 1 and the first fixed contact are connected, second moving contact and second fixed contact of the first K switch 1 are connected, and direct-flow distribution system 20 is powered by electric loading 30 by the first K switch 1.
Stop power supply at direct-flow distribution system 20, such as direct-flow distribution system 20 carries out stopping quotation on the exchange maintenance when needing to stop transport, 3rd K switch 3 closes, namely the first moving contact of the 3rd K switch 3 and the first fixed contact are connected, second moving contact and second fixed contact of the 3rd K switch 3 are connected, and the direct current that the alternating current that AC power 131 provides exports after rectification module 132 carries out rectification is powered to by electric loading 30 by reversible diode group 133, the 3rd K switch 3; Or, when access failure AC power 131,3rd K switch 3, the 4th K switch 4 are all closed, namely the first moving contact of the 3rd K switch 3 and the first fixed contact are connected, second moving contact and second fixed contact of the 3rd K switch 3 are connected, first moving contact and first fixed contact of the 4th K switch 4 are connected, and the second moving contact and second fixed contact of the 4th K switch 4 are connected, and batteries E is powered by electric loading 30 by the 4th K switch 4, reversible diode group 133, the 3rd K switch 3.
After connection AC power 131 or given by batteries E is powered by electric loading 30, first path of power switching circuit 12 disconnects, namely the first moving contact of the first K switch 1 and the first fixed contact disconnect, second moving contact and second fixed contact of the first K switch 1 disconnect, power switching circuit 12 switches to the alternate path conducting of power switching circuit 12, namely the first moving contact of the first K switch 1 and the 3rd fixed contact are connected, and the second moving contact and the 4th fixed contact of the first K switch 1 are connected; Meanwhile, second switch K2 closes, and namely first moving contact of second switch K2 and the first fixed contact are connected, and the second moving contact and second fixed contact of second switch K2 are connected, and DC power supply 111 for subsequent use is powered by electric loading 30 by second switch K2, the first K switch 1.
Given by direct-flow distribution system 20 with electric loading 30 power switching for by DC power supply 111 for subsequent use to after powering by electric loading 30,3rd K switch 3 disconnects, namely given by direct-flow distribution system 20 with electric loading 30 power switching for by first again power supply circuits 11 to after powering by electric loading 30, second again power supply circuits 13 cut off the power supply by electric loading 30.
Thus, be by DC power supply 111 power supply process for subsequent use by direct-flow distribution system 20 power switching, by second again power supply circuits 13 powered by electric loading 30, make being in the process of being powered by DC power supply 111 for subsequent use by direct-flow distribution system 20 power switching, uninterrupted with the power supply of electric loading 30.
Restore electricity at direct-flow distribution system 20, such as direct-flow distribution system 20 carry out stopping quotation on the exchange maintenance complete after needs rerun when restoring electricity, 3rd K switch 3 closes, and the direct current that the alternating current that AC power 131 provides exports after rectification module 132 carries out rectification is powered to by electric loading 30 by reversible diode group 133, the 3rd K switch 3; Or when access failure AC power 131, the 3rd K switch 3, the 4th K switch 4 are all closed, batteries E is powered by electric loading 30 by the 4th K switch 4, reversible diode group 133, the 3rd K switch 3.
After powering to electric loading in connection AC power 131 or by batteries E, the alternate path of power switching circuit 12 disconnects, switch to the first path conducting of power switching circuit 12, namely the first moving contact of the first K switch 1 and the first fixed contact is switched to connect, second moving contact and second fixed contact of the first K switch 1 are connected, and direct-flow distribution system 20 is powered by electric loading 30 by the first path of the first K switch 1.
Be direct-flow distribution system 20 to after powering by electric loading 30 being given with electric loading 30 power switching by DC power supply for subsequent use 111,3rd K switch 3 disconnects, namely by first again power supply circuits 11 give with electric loading 30 power switching for by direct-flow distribution system 20 to after powering by electric loading 30, second again power supply circuits 13 cut off the power supply by electric loading 30.
Thus, be by direct-flow distribution system 20 power supply process by DC power supply 111 power switching for subsequent use, by second again power supply circuits 13 powered by electric loading 30, make being in the process of being powered by DC power supply 111 for subsequent use by direct-flow distribution system 20 power switching, uninterrupted with the power supply of electric loading 30.
The utility model also provides a kind of DC suppling equipment, this DC suppling equipment comprises direct-flow distribution system 20 and direct current system electric supply installation 10 again, this direct-flow distribution system 20 is for being powered by electric loading 30, direct current system again electric supply installation 10 is connected to direct-flow distribution system 20 and with between electric loading 30, for being powered by electric loading 30 when direct-flow distribution system 20 is stopped transport.This direct current system again circuit structure of electric supply installation 10, operation principle and the beneficial effect that brings, all with reference to above-described embodiment, repeats no more herein.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model specification and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (7)
1. direct current system electric supply installation again, be connected to direct-flow distribution system and with between electric loading, it is characterized in that, described direct current system again electric supply installation comprise for when direct-flow distribution system is stopped power supply to first of electricity consumption load supplying again power supply circuits, for switch direct-flow distribution system and first again power supply circuits to the power switching circuit of electricity consumption load supplying, and for when described power switching circuit switches to second of electricity consumption load supplying the power supply circuits again;
Described power switching circuit comprises the first path and alternate path, first path of described power switching circuit is connected between direct-flow distribution system and described electric loading, the alternate path of described power switching circuit is connected to described first again between power supply circuits and described electric loading, described second again power supply circuits be connected by electric loading with described.
2. direct current system electric supply installation more as claimed in claim 1, it is characterized in that, described power switching circuit comprises the first switch;
First moving contact of described first switch is connected with the described positive supply input by electric loading, and the second moving contact of described first switch is connected with the described negative supply input by electric loading; First fixed contact of described first switch is connected with the positive supply output of described direct-flow distribution system, and the second fixed contact of described first switch is connected with the negative supply output of described direct-flow distribution system; 3rd fixed contact of described first switch is connected with the positive supply output of the described first power supply circuits again, and the 4th fixed contact of described first switch is connected with the negative supply output of the described first power supply circuits again.
3. direct current system electric supply installation more as claimed in claim 2, is characterized in that, described first again power supply circuits comprise DC power supply for subsequent use and second switch;
First fixed contact of described second switch is connected with the positive supply output of described DC power supply for subsequent use, and the second fixed contact of described second switch is connected with the negative supply output of described DC power supply for subsequent use;
First moving contact of described second switch is connected with the 3rd fixed contact of described first switch, and the second moving contact of described first switch is connected with the 4th fixed contact of described first switch.
4., as the electric supply installation again of the direct current system in claims 1 to 3 as described in any one, it is characterized in that, described second again power supply circuits comprise AC power, rectification module, reversible diode group and the 3rd switch;
Described rectification module is connected with described AC power, and described reversible diode group is connected between described rectification module and described 3rd switch, and described 3rd switch is connected by electric loading with described.
5. direct current system electric supply installation more as claimed in claim 4, it is characterized in that, described reversible diode group comprises the first diode and second diode of reverse parallel connection;
First moving contact of described 3rd switch is connected with the described positive supply input by electric loading, and the second moving contact of described 3rd switch is connected with the described negative supply input by electric loading; First fixed contact of described 3rd switch is connected with the negative electrode of described first diode, and the second fixed contact of described 3rd switch is connected with the anode of described second diode; The anode of described first diode is connected with the positive output end of described rectification module, and the negative electrode of described second diode is connected with the negative output terminal of described rectification module.
6. direct current system electric supply installation more as claimed in claim 5, is characterized in that, described second again power supply circuits also comprise batteries and the 4th switch;
First moving contact of described 4th switch is connected with the positive pole of described batteries, and the second moving contact of described 4th switch is connected with the negative pole of described batteries; First fixed contact of described 4th switch is connected with the anode of described first diode, and the second fixed contact of described 4th switch is connected with the negative electrode of described second diode.
7. a DC suppling equipment, comprise to the direct-flow distribution system of electricity consumption load supplying, it is characterized in that, described DC suppling equipment also comprises the direct current system electric supply installation again in claim 1-6 described in any one, and described direct current system again electric supply installation is used for when described direct-flow distribution system is stopped transport to electricity consumption load supplying.
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| CN201520244871.8U CN204706942U (en) | 2015-04-21 | 2015-04-21 | Direct current system is electric supply installation and DC suppling equipment again |
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| CN201520244871.8U CN204706942U (en) | 2015-04-21 | 2015-04-21 | Direct current system is electric supply installation and DC suppling equipment again |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113991834A (en) * | 2021-11-24 | 2022-01-28 | 广东电网有限责任公司 | Uninterrupted DC double-power automatic change-over switch device |
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2015
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113991834A (en) * | 2021-11-24 | 2022-01-28 | 广东电网有限责任公司 | Uninterrupted DC double-power automatic change-over switch device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yu Huimin Inventor after: Huang Huaiduo Inventor after: Li Jie Inventor before: Yu Huimin Inventor before: Huang Huaiduo Inventor before: Huang Jie |
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| COR | Change of bibliographic data |