CN113476765A - Full-submergence automatic fire-fighting system for engine room of wind turbine generator and control method thereof - Google Patents
Full-submergence automatic fire-fighting system for engine room of wind turbine generator and control method thereof Download PDFInfo
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- CN113476765A CN113476765A CN202110784232.0A CN202110784232A CN113476765A CN 113476765 A CN113476765 A CN 113476765A CN 202110784232 A CN202110784232 A CN 202110784232A CN 113476765 A CN113476765 A CN 113476765A
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- 238000010248 power generation Methods 0.000 claims abstract description 73
- 239000000843 powder Substances 0.000 claims description 4
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- 230000001960 triggered effect Effects 0.000 description 7
- 238000012423 maintenance Methods 0.000 description 5
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- 150000003839 salts Chemical class 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
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Abstract
The invention discloses a full-submerged automatic fire-fighting system of a wind turbine generator cabin and a control method thereof, wherein the automatic fire-fighting system comprises: the time relay and the magnetic power generation fire extinguishing modules are arranged on the base; the magnetic power generation fire extinguishing modules are respectively arranged in the wind turbine generator room, and the magnetic power generation fire extinguishing modules are connected in parallel and then connected with the time relay in parallel; when the temperature of any one magnetic power generation fire extinguishing module reaches a first preset temperature value, fire extinguishing is started, and a fire extinguishing starting signal is fed back to the time relay; the time relay receives the fire extinguishing starting signal and controls the rest magnetic power generation fire extinguishing modules to start to extinguish fire after the preset delay time is long. The magnetic power generation fire extinguishing module realizes the full-submerged fire extinguishing function of the engine room of the wind turbine generator, can simultaneously realize that all fire extinguishing units in the engine room extinguish fire simultaneously, instantly extinguish all fire sources in the engine room, prevent the reburning of all positions in the engine room, and improve the reliability and the safety of the fire extinguishing device in the engine room of the wind turbine generator.
Description
Technical Field
The invention relates to the technical field of wind power equipment control, in particular to a full-submerging automatic fire-fighting system for a cabin of a wind turbine generator and a control method thereof.
Background
The wind turbine generator system cabin is in special environments such as strong airflow, small space, high and low temperature, high vibration, salt spray corrosion, electromagnetic interference and the like, the general fire fighting system is complex in structure, and the fire fighting system cannot stably operate and is very easy to lose efficacy in the strong electromagnetic and high and low temperature environments. The interior of the wind turbine generator cabin has a plurality of inflammable positions and is in a strong airflow environment, and once a fire disaster occurs, the fire can spread the whole cabin in a short time. Therefore, in order to meet the requirement of safe and stable operation in the wind turbine generator cabin, a fire fighting system which is simple in structure, practical in function, stable in performance and free of maintenance is urgently required in the wind turbine generator cabin.
At present, an automatic fire-fighting system of a wind turbine generator cabin mainly adopts the following scheme: first, passive form fire extinguishing system: the system is simple, the fire extinguishing device is started by a heat-sensitive wire or a magnetic generating device, and the heat-sensitive wire and the magnetic generating device are used as a fire detector and a starter; secondly, active fire extinguishing system: the system is complex, the fire extinguishing device is started by a fire alarm controller and is matched with a temperature sensing and smoke sensing fire detector to carry out fire detection. The two control modes are comprehensively analyzed, and the following defects exist:
1. the start-up of heat-sensitive wire is influenced by burning rate, can not realize remote fire control linkage, and heat-sensitive wire passes a fire process unstability, when using many sets of extinguishing devices, can't accomplish to submerge entirely and put out a fire. And has no function of starting/stopping the fire fighting system manually.
2. The active fire-fighting system is started by adopting a fire alarm controller, and a power supply of the fire alarm controller adopts a plurality of batteries, so that the active fire-fighting system is easy to be interfered by electromagnetic interference and has a limited service life. The temperature and smoke detectors need regular maintenance and can not be used in low-temperature environment and strong electromagnetic environment, and the false alarm phenomenon is easy to occur.
Chinese patent CN 209848181U discloses a full-automatic fire extinguishing system for wind generating set, which is characterized in that the system comprises a temperature-sensing and smoke-sensing fire detector and a fire alarm controller unit, wherein the temperature-sensing and smoke-sensing fire detector needs to be maintained regularly, the fire alarm controller cannot operate normally in strong electromagnetic or low temperature environment, and the fire extinguishing device is thermal aerosol, which cannot prevent the set from reburning.
Chinese patent CN 102716558A discloses a special fire extinguishing system for a wind driven generator cabin, which is characterized in that the system has no emergency start-stop function and delay start-up function, when cabin personnel are in maintenance operation, the fire extinguishing device can not be triggered on time, and people are very easy to suffocate and die, and the fire extinguishing device of the system needs to be maintained regularly, can not operate in an ultra-low temperature environment, and can not realize a full flooding fire extinguishing function.
Disclosure of Invention
The invention aims to provide a full-flooding automatic fire-fighting system for a wind turbine generator cabin and a control method thereof.
In order to solve the above technical problem, a first aspect of an embodiment of the present invention provides a full-flooding automatic fire fighting system for a nacelle of a wind turbine, including: the time relay and the magnetic power generation fire extinguishing modules are arranged on the base;
the magnetic power generation fire extinguishing modules are respectively arranged in the wind turbine generator room, and the magnetic power generation fire extinguishing modules are connected in parallel and then connected with the time relay in parallel;
when the temperature of any one magnetic power generation fire extinguishing module reaches a first preset temperature value, starting to extinguish fire, and feeding back a fire extinguishing starting signal to the time relay;
and the time relay receives the fire extinguishing starting signal and controls the rest of the magnetic power generation fire extinguishing modules to start to extinguish fire simultaneously after the preset delay time.
Further, the magnetic power generation fire extinguishing module includes: the rectifier diodes, the magnetic power generation units and the fire extinguishing units are in one-to-one correspondence;
the electric starting end of the fire extinguishing unit is connected with the starting end of the magnetic generating unit,
the common end of the fire extinguishing unit and the positive electrode of the magnetic power generation unit is connected with the negative electrode of the rectifier diode;
the anode of the rectifier diode is connected with the first port of the time relay;
the negative electrodes of all the magnetic power generation units are connected with the second port of the time relay, and the feedback ends of all the magnetic power generation units are respectively connected with the third port and the fourth port of the time relay;
and the feedback ends of the fire extinguishing units are connected in series and then are connected with a master control fire-fighting starting feedback signal receiving port.
Further, the magnetic power generation fire extinguishing module further comprises: a heat-sensitive wire unit;
the thermosensitive wire units in the magnetic power generation fire extinguishing modules are connected in series;
the heat-sensitive wire unit is connected with the fire extinguishing unit, and the heat-sensitive wire unit is ignited and started to extinguish fire when the temperature reaches a second preset temperature value.
Further, the second preset temperature value is 170 ℃.
Further, the fire extinguishing unit is an ultrafine dry powder fire extinguisher.
Further, the first preset temperature value is 93 ℃.
Further, the automatic fire extinguishing system that the wind turbine generator cabin is totally submerged still includes: an emergency start-stop module;
the emergency starting and stopping module is connected with the feedback end of the magnetic power generation fire extinguishing module in parallel, and is switched from a normally open state to a closed state according to an external manual control instruction, the time relay is switched on, and then all the magnetic power generation fire extinguishing modules are controlled to be started.
Furthermore, the magnetic power generation fire extinguishing modules are respectively arranged at corresponding positions of a high-speed shaft brake, a hydraulic station, a generator, a power cable and/or a gear box in the wind turbine generator cabin.
Correspondingly, a second aspect of the embodiments of the present invention provides a control method for a full-flooding automatic fire fighting system for a nacelle of a wind turbine, including the following steps:
when the temperature in the cabin of the wind turbine generator reaches a first preset temperature value, starting the magnetic power generation fire extinguishing module at the corresponding position to extinguish fire and sending a fire extinguishing starting signal to the time relay;
and the time relay controls the rest of the magnetic power generation fire extinguishing modules to be started according to the fire extinguishing starting signal, and extinguishes the fire of the wind turbine generator room in a full range.
Further, after the magnetic power generation fire extinguishing module of the corresponding position starts to extinguish fire, the fire extinguishing device further comprises:
sending a fire extinguishing starting signal to the main control system of the wind turbine generator;
and controlling the wind turbine main control system to shut down the operation of the wind turbine and closing the ventilation device of the cabin of the wind turbine.
The technical scheme of the embodiment of the invention has the following beneficial technical effects:
the magnetic power generation fire extinguishing module realizes the full-submerged fire extinguishing function of the engine room of the wind turbine generator, can simultaneously realize that all fire extinguishing units in the engine room extinguish fire simultaneously, instantly extinguish all fire sources in the engine room, prevent the reburning of all positions in the engine room, and improve the reliability and the safety of the fire extinguishing device in the engine room of the wind turbine generator.
Drawings
FIG. 1 is a schematic diagram of a fully-submerged automatic fire-fighting system for a wind turbine generator room provided by an embodiment of the invention;
fig. 2 is a logic diagram of a control method of the full-flooding automatic fire-fighting system for the wind turbine generator cabin, provided by the embodiment of the invention.
Reference numerals:
1. time relay, 2, magnetic power generation fire extinguishing module, 21, rectifier diode, 22, magnetic power generation unit, 23, fire extinguishing unit, 24, heat-sensitive wire unit, 3, emergency start-stop module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Fig. 1 is a schematic diagram of a fully-submerged automatic fire-fighting system for a wind turbine generator room according to an embodiment of the invention.
Referring to fig. 1, a first aspect of an embodiment of the present invention provides a full-flooding automatic fire fighting system for a nacelle of a wind turbine, including: a time relay 1 and a plurality of magnetic power generation fire extinguishing modules 2. The magnetic power generation fire extinguishing modules 2 are respectively arranged in the wind turbine generator room, and the magnetic power generation fire extinguishing modules 2 are connected in parallel and then connected in parallel with the time relay 1. Any one of the magnetic power generation fire extinguishing modules 2 is started to extinguish fire when the temperature of the magnetic power generation fire extinguishing module reaches a first preset temperature value, and feeds back a fire extinguishing starting signal to the time relay 1. The time relay 1 receives the fire extinguishing starting signal and controls the rest of the magnetic power generation fire extinguishing modules 2 to start to extinguish fire at the same time after the preset delay time is long.
The full-submerged automatic fire-fighting system for the engine room of the wind turbine generator solves the problem of the automatic fire-fighting system for the engine room of the wind turbine generatorUse of Limited service life,The system is suitable for special environments such as strong airflow, small space, high and low temperature, high vibration, salt spray corrosion, electromagnetic interference and the like where the wind turbine generator is located, is free of maintenance and long in service life, and avoids the risk of mistaken spraying or non-spraying of the fire-fighting system caused by virtual connection, missed connection and mistaken short circuit of the wiring of the fire-fighting system.
Specifically, in the first embodiment of the present invention, the magnetic power generation fire extinguishing module 2 includes: the rectifier diodes 21, the magnetic power generation unit 22 and the fire extinguishing unit 23 are in one-to-one correspondence. Wherein, the electric starting end of the fire extinguishing unit 23 is connected with the starting end of the magnetic generating unit 22, and the common end of the fire extinguishing unit 23 and the positive pole of the magnetic generating unit 22 is connected with the negative pole of the rectifier diode 21; the anode of the rectifier diode 21 is connected with the first port of the time relay 1; the cathodes of all the magnetic power generation units 22 are connected with the second port of the time relay 1, and the feedback ends of all the magnetic power generation units 22 are respectively connected with the third port and the fourth port of the time relay 1; the feedback end of the fire extinguishing unit 23 is connected in series and then connected with the main control fire-fighting starting feedback signal receiving port.
Optionally, the first preset temperature value is 93 ℃; the fire extinguishing unit 23 is a superfine dry powder fire extinguisher.
Further, the magnetic power generation fire extinguishing module 2 further includes: a heat-sensitive wire unit 24; the thermosensitive wire units 24 in the magnetic power generation fire extinguishing modules 2 are connected in series; the heat-sensitive wire unit 24 is connected to the fire extinguishing unit 23, and it ignites and starts the fire extinguishing unit 23 to extinguish fire when the temperature reaches a second preset temperature value. This technical scheme has solved the problem that the thermal wire can't link many sets of extinguishing device simultaneously and carry out the total flooding fire extinguishing.
Optionally, the second preset temperature value is 170 ℃.
In addition, the automatic fire extinguishing system of full flooding in wind turbine generator system cabin still includes: and an emergency start-stop module 3.
The emergency start-stop module 3 is connected with the feedback end of the magnetic power generation fire extinguishing module 2 in parallel, and is switched from a normally open state to a closed state according to an external manual control instruction, the time relay 1 is switched on, and then all the magnetic power generation fire extinguishing modules 2 are controlled to be started. Through setting up promptly to open and stop module 3, solved the problem that can't manual start/stop extinguishing device, improved the convenience of on-the-spot fortune dimension personnel when handling the condition of a fire, further improved the security in wind turbine generator system cabin.
Specifically, the magnetic power generation fire extinguishing modules 2 are respectively arranged at corresponding positions of a high-speed shaft brake, a hydraulic station, a generator, a power cable and/or a gear box in a cabin of the wind turbine generator.
Taking the doubly-fed wind turbine as an example, the fire extinguishing unit 23 can be installed above and near the high-speed shaft brake of the wind turbine, above and near the hydraulic station, above and near the generator, above and near the power cable, and above and near the gear box. The fire extinguishing unit 23 is an ultrafine dry powder fire extinguishing device, a feedback signal is switched from a normally closed state to a disconnected state after being triggered, a feedback signal is switched from a normally open state to a closed state after the magnetic generating unit 22 is triggered, a signal is switched from a normally open state to a closed state after the emergency start-stop module 3 is triggered, the thermosensitive wire units 24 are connected in series, an electric starting end of the fire extinguishing unit 23 is connected with a starting end of the magnetic generating unit 22, a public end of the positive electrodes of the fire extinguishing unit 23 and the magnetic generating unit 22 is connected with the negative electrode of the rectifier diode 21, the positive electrodes of all the rectifier diodes 21 are connected with a first port a of the time relay 1, the negative electrodes of all the magnetic generating units 22 are connected with a second port b of the time relay 1, and the feedback ends of all the magnetic generating units 22 are connected with a third port c and a fourth port d of the time relay 1 after being connected with the ports of the emergency start-stop module 3 in parallel. The fifth port of the time relay 1 is connected with the +24V power supply of the wind turbine generator main control system, the sixth port f of the time relay 1 is connected with the public end of the wind turbine generator main control system, the grounding ends of all the fire extinguishing units 23 are grounded, and the feedback ends of all the fire extinguishing units 23 are connected in series and then connected into the main control fire-fighting starting feedback signal receiving port.
The technical scheme of the invention does not need a PLC or other controller components, and can realize the functions of automatically starting and extinguishing the full-flooding fire, starting/stopping the full-flooding fire in an emergency, starting the fire in an emergency when the system is in failure and feeding back signals.
Specifically, the full-submerged fire extinguishing function is automatically started: when the environmental temperature rises to 93 ℃, the magnetic power generation unit 22 acts to start the corresponding fire extinguishing unit 23, the starting feedback port of the magnetic power generation unit 22 is closed, the coil of the time relay 1 is electrified, the normally open contact is attracted after the preset time delay is over, and all the other fire extinguishing units 23 are electrified and triggered simultaneously.
Emergency start/stop full flooding fire extinguishing function: when a fire accident happens, the field operation and maintenance personnel start the emergency button, the coil of the time relay 1 is electrified, the normally open contact is attracted after the preset time delay is long, and all the fire extinguishing units 23 are electrified and triggered simultaneously.
The system is invalid and starts the fire extinguishing function in emergency: when the environmental temperature rises to 170 ℃ in the case of extreme conditions and the power supply circuit is burnt out and cannot supply power, the heat-sensitive wire unit 24 ignites and starts all the fire extinguishing units 23.
The signal feedback linkage function is as follows: when any one fire extinguishing unit 23 is started, a starting feedback signal is sent to the main control system of the wind turbine generator, the main control system receives the starting feedback signal, then the main control system is stopped emergently, the exhaust device is closed, a signal is fed back to the central control room, and the central control room gives an alarm.
The function of alarming the wiring error is as follows: the fire extinguishing starting feedback nodes adopt NC normally closed nodes, all the feedback nodes are connected with fire extinguishing feedback ports of the wind turbine main control system in series, and when any line is broken, a DI port of a PLC module of the wind turbine main control system is in power-off alarm.
Component failure shielding function: the feedback nodes of the magnetic power generation unit 22 are NO normally open nodes, all the feedback nodes are connected with the port of the time relay 1 in parallel, when any line is broken or the magnetic power generation device is damaged, the fire protection system is automatically shielded, the operation of other parts is not influenced, and the fire protection system is not triggered by mistake.
Fig. 2 is a logic diagram of a control method of the full-flooding automatic fire-fighting system for the wind turbine generator cabin, provided by the embodiment of the invention.
Correspondingly, referring to fig. 2, a second aspect of the embodiment of the present invention provides a method for controlling a fully-submerged automatic fire protection system of a wind turbine generator cabin, including the following steps:
s100, when the temperature in the cabin of the wind turbine generator reaches a first preset temperature value, the magnetic power generation fire extinguishing module 2 at the corresponding position starts to extinguish fire and sends a fire extinguishing starting signal to the time relay 1.
S200, the time relay 1 controls the rest magnetic power generation fire extinguishing modules 2 to be started according to fire extinguishing starting signals, and extinguishes fire of the wind turbine generator room in a full range.
Further, after the magnetic power generation fire extinguishing module 2 at the corresponding position starts to extinguish fire, the method further comprises the following steps:
and S310, sending a fire extinguishing starting signal to the main control system of the wind turbine generator system.
And S320, controlling the main control system of the wind turbine generator to shut down the operation of the wind turbine generator, and closing a ventilation device of a cabin of the wind turbine generator.
The embodiment of the invention aims to protect a full-submerging automatic fire-fighting system of a wind turbine generator cabin and a control method thereof, wherein the automatic fire-fighting system comprises: the time relay and the magnetic power generation fire extinguishing modules are arranged on the base; the magnetic power generation fire extinguishing modules are respectively arranged in the wind turbine generator room, and the magnetic power generation fire extinguishing modules are connected in parallel and then connected with the time relay in parallel; when the temperature of any one magnetic power generation fire extinguishing module reaches a first preset temperature value, fire extinguishing is started, and a fire extinguishing starting signal is fed back to the time relay; the time relay receives the fire extinguishing starting signal and controls the rest magnetic power generation fire extinguishing modules to start to extinguish fire after the preset delay time is long. The technical scheme has the following effects:
the magnetic power generation fire extinguishing module realizes the full-submerged fire extinguishing function of the engine room of the wind turbine generator, can simultaneously realize that all fire extinguishing units in the engine room extinguish fire simultaneously, instantly extinguish all fire sources in the engine room, prevent the reburning of all positions in the engine room, and improve the reliability and the safety of the fire extinguishing device in the engine room of the wind turbine generator.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. The utility model provides an automatic fire extinguishing system of wind turbine generator system cabin total flooding which characterized in that includes: the time relay and the magnetic power generation fire extinguishing modules are arranged on the base;
the magnetic power generation fire extinguishing modules are respectively arranged in the wind turbine generator room, and the magnetic power generation fire extinguishing modules are connected in parallel and then connected with the time relay in parallel;
when the temperature of any one magnetic power generation fire extinguishing module reaches a first preset temperature value, starting to extinguish fire, and feeding back a fire extinguishing starting signal to the time relay;
and the time relay receives the fire extinguishing starting signal and controls the rest of the magnetic power generation fire extinguishing modules to start to extinguish fire simultaneously after the preset delay time.
2. The wind turbine nacelle total flooding automatic fire fighting system according to claim 1,
the magnetic power generation fire extinguishing module includes: the rectifier diodes, the magnetic power generation units and the fire extinguishing units are in one-to-one correspondence;
the electric starting end of the fire extinguishing unit is connected with the starting end of the magnetic generating unit,
the common end of the fire extinguishing unit and the positive electrode of the magnetic power generation unit is connected with the negative electrode of the rectifier diode;
the anode of the rectifier diode is connected with the first port of the time relay;
the negative electrodes of all the magnetic power generation units are connected with the second port of the time relay, and the feedback ends of all the magnetic power generation units are respectively connected with the third port and the fourth port of the time relay;
and the feedback ends of the fire extinguishing units are connected in series and then are connected with a master control fire-fighting starting feedback signal receiving port.
3. The wind turbine nacelle total flooding automatic fire fighting system according to claim 2,
the magnetic power generation fire extinguishing module further comprises: a heat-sensitive wire unit;
the thermosensitive wire units in the magnetic power generation fire extinguishing modules are connected in series;
the heat-sensitive wire unit is connected with the fire extinguishing unit, and the heat-sensitive wire unit is ignited and started to extinguish fire when the temperature reaches a second preset temperature value.
4. The wind turbine nacelle total flooding automatic fire fighting system according to claim 3,
the second preset temperature value is 170 ℃.
5. The wind turbine nacelle total flooding automatic fire fighting system according to claim 2,
the fire extinguishing unit is an ultrafine dry powder fire extinguisher.
6. Wind turbine nacelle total flooding automatic fire fighting system according to any one of claims 1 to 5,
the first preset temperature value is 93 ℃.
7. The wind turbine nacelle total flooding automatic fire fighting system according to any one of claims 1 to 5, further comprising: an emergency start-stop module;
the emergency starting and stopping module is connected with the feedback end of the magnetic power generation fire extinguishing module in parallel, and is switched from a normally open state to a closed state according to an external manual control instruction, the time relay is switched on, and then all the magnetic power generation fire extinguishing modules are controlled to be started.
8. Wind turbine nacelle total flooding automatic fire fighting system according to any one of claims 1 to 5,
the magnetic power generation fire extinguishing modules are respectively arranged at corresponding positions of a high-speed shaft brake, a hydraulic station, a generator, a power cable and/or a gear box in the wind turbine generator cabin.
9. A control method of a full-submerged automatic fire-fighting system of a wind turbine generator cabin is characterized by comprising the following steps:
when the temperature in the cabin of the wind turbine generator reaches a first preset temperature value, starting the magnetic power generation fire extinguishing module at the corresponding position to extinguish fire and sending a fire extinguishing starting signal to the time relay;
and the time relay controls the rest of the magnetic power generation fire extinguishing modules to be started according to the fire extinguishing starting signal, and extinguishes the fire of the wind turbine generator room in a full range.
10. The control method of the wind turbine generator system cabin total flooding automatic fire fighting system according to claim 9, wherein after the magnetic power generation fire extinguishing module in the corresponding position starts fire extinguishing, the method further comprises:
sending a fire extinguishing starting signal to the main control system of the wind turbine generator;
and controlling the wind turbine main control system to shut down the operation of the wind turbine and closing the ventilation device of the cabin of the wind turbine.
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| CN210813612U (en) * | 2019-07-05 | 2020-06-23 | 深圳市源烯科技有限公司 | Automatic fire extinguishing system for electrical cabinet |
| CN210924830U (en) * | 2019-10-21 | 2020-07-03 | 中交三公局第一工程有限公司 | Intelligent fire-fighting early warning system |
| CN111569323A (en) * | 2020-06-11 | 2020-08-25 | 浙江蓝盾电工新材料科技有限公司 | Open many times and stop controllable lithium cell energy storage fire extinguishing systems |
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