Fire extinguishing device

Abstract

The present invention discloses a fire extinguishing device, which includes a storage member, at least two pistons, at least two power members, at least two connecting pipes, and a confluence member. With the above fire extinguishing device, when a lithium battery undergoes thermal runaway, the power member operates to drive the piston to move towards the discharge port. The movement of the piston towards the discharge port can squeeze the fire extinguishing agent stored in the storage cavity so that the fire extinguishing agent is discharged from the discharge port, and then is sprayed out through the connecting pipe, the connecting channel, and the spray port to extinguish the fire. In different stages of thermal runaway, different power members operate, correspondingly driving different pistons to move, so that different fire extinguishing agents are sprayed out. In this way, multiple sprays can be carried out during the process of thermal runaway, and different fire extinguishing agents can be sprayed out each time for different stages of thermal runaway, effectively improving the fire extinguishing efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of fire-fighting equipment, and particularly to a fire extinguishing device. Background Art

[0002] Lithium batteries have the advantages of high energy density, long cycle life, high energy efficiency, low self-discharge, no memory effect, and environmental protection. They are currently the most competitive secondary batteries and have begun to stand out in fields such as transportation and energy storage. However, when lithium batteries are abused or the safety design is improper, there is a possibility of thermal runaway. When thermal runaway occurs, a suppression device needs to be used for suppression and extinguishing. Existing suppression devices usually directly spray the fire extinguishing agent stored in the fire extinguishing bottle after the thermal runaway of the lithium battery for fire extinguishing, and the fire extinguishing efficiency is low. Summary of the Invention

[0003] The purpose of the present invention is to provide a fire extinguishing device with high fire extinguishing efficiency.

[0004] A fire extinguishing device includes:

[0005] A storage member having at least two inner cavities and at least two discharge ports;

[0006] At least two pistons, with one piston arranged in each inner cavity. The piston is used to divide the inner cavity into a non-communicating storage cavity and a power cavity, and each piston can reciprocate along the arrangement direction of the storage cavity and the power cavity. Each discharge port is communicated with one end of the storage cavity far from the power cavity;

[0007] At least two power members, with one power member arranged in each power cavity. Each power member is used to provide power for one piston to move towards the discharge port;

[0008] At least two connecting pipes, with one end of each connecting pipe communicated with one discharge port; and

[0009] A confluence member having a connecting channel and a spray port. The other end of each connecting pipe far from the discharge port is communicated with the connecting channel, and the spray port is communicated with the connecting channel;

[0010] Wherein, each storage cavity is used to store a fire extinguishing agent, and the fire extinguishing agents stored in any two storage cavities are different.

[0011] When the above fire extinguishing device is adopted, when the lithium battery undergoes thermal runaway, the power component acts to drive the piston to move towards the discharge port. The movement of the piston towards the discharge port can squeeze the fire extinguishing agent stored in the storage cavity so that the fire extinguishing agent is discharged from the discharge port, and then is sprayed out through the connecting pipe, the connecting channel and the spray port to extinguish the fire. And in different stages of thermal runaway, different power components act, correspondingly driving different pistons to move, so that different fire extinguishing agents are sprayed out. In this way, multiple sprays can be carried out during the process of thermal runaway, and different fire extinguishing agents can be sprayed out each time for different stages of thermal runaway, effectively improving the fire extinguishing efficiency.

[0012] In one embodiment, at least two of the inner cavities include a first inner cavity, a second inner cavity and a third inner cavity, at least two of the discharge ports include a first discharge port, a second discharge port and a third discharge port, at least two of the pistons include a first piston, a second piston and a third piston, at least two of the power components include a first power component, a second power component and a third power component, and at least two of the connecting pipes include a first connecting pipe, a second connecting pipe and a third connecting pipe;

[0013] The first piston is disposed in the first inner cavity to divide the first inner cavity into a first storage cavity and a first power cavity. The second piston is disposed in the second inner cavity to divide the second inner cavity into a second storage cavity and a second power cavity. The third piston is disposed in the third inner cavity to divide the third inner cavity into a third storage cavity and a third power cavity;

[0014] The first power component is disposed in the first power cavity, the second power component is disposed in the second power cavity, and the third power component is disposed in the third power cavity;

[0015] The first discharge port is communicated with the first storage cavity. One end of the first connecting pipe is communicated with the first discharge port. The second discharge port is communicated with the second storage cavity. One end of the second connecting pipe is communicated with the second discharge port. The third discharge port is communicated with the third storage cavity. One end of the third connecting pipe is communicated with the third discharge port.

[0016] In one embodiment, the fire extinguishing device further includes a controller and a first detector. The controller is electrically connected to the first detector and the first power component. The first detector is used to detect a first gas, and the controller is used to control the action of the first power component according to the detection information of the first detector.

[0017] In one embodiment, the fire extinguishing device further includes a second detector. The controller is further electrically connected to the second detector and the second power component. The second detector is used to detect a second gas, and the controller is further used to control the action of the second power component according to the detection information of the second detector.

[0018] In one embodiment, the fire extinguishing device further includes a temperature sensor, and the controller is also electrically connected to the temperature sensor and the third power member. The controller is further configured to control the operation of the third power member according to the temperature information detected by the temperature sensor.

[0019] In one embodiment, at least two of the inner cavities further include a fourth inner cavity, at least two of the discharge ports further include a fourth discharge port, at least two of the pistons further include a fourth piston, at least two of the power members further include a fourth power member, and at least two of the connecting pipes further include a fourth connecting pipe;

[0020] The fourth piston is disposed in the fourth inner cavity to divide the fourth inner cavity into a fourth storage cavity and a fourth power cavity. The fourth power member is disposed in the fourth power cavity. The fourth discharge port communicates with the fourth storage cavity, and one end of the fourth connecting pipe communicates with the fourth discharge port;

[0021] The controller is also electrically connected to the third power member and the fourth power member to control the operations of the third power member and the fourth power member, and the time intervals of the operations of the second power member and the third power member are the same as the time intervals of the operations of the third power member and the fourth power member.

[0022] In one embodiment, the fire extinguishing device further includes at least two connecting valves, each of the connecting valves is disposed at one of the discharge ports, and one end of each of the connecting pipes communicates with the connecting valve. Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of a fire extinguishing device provided by an embodiment of the present invention;

[0024] Figure 2 is Figure 1 a schematic cross-sectional structural diagram of the fire extinguishing device shown.

[0025] Reference Numerals:

[0026] 10. Storage member; 11. Inner cavity; 12. Discharge port; 13. Storage cavity; 14. Power cavity; 20. Piston; 30. Power member; 40. Connecting pipe; 50. Confluence member; 60. Connecting valve. Detailed Embodiments

[0027] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0029] In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath", and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0032] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0033] Please refer to Figure 1 and Figure 2 , a fire extinguishing device 100 provided by an embodiment of the present invention includes a storage member 10, at least two pistons 20, at least two power members 30, at least two connecting pipes 40 and a confluence member 50.

[0034] The storage member 10 has at least two inner cavities 11 and at least two discharge ports 12. A piston 20 is disposed in each inner cavity 11. The piston 20 is used to divide the inner cavity 11 into a non-communicating storage cavity 13 and a power cavity 14, and each piston 20 can reciprocate along the arrangement direction of the storage cavity 13 and the power cavity 14. Each discharge port 12 communicates with one end of a storage cavity 13 away from the power cavity 14, and each storage cavity 13 is used to store fire extinguishing agent.

[0035] A power member 30 is disposed in each power cavity 14, and each power member 30 is used to provide power for the piston 20 to move toward the discharge port 12.

[0036] One end of each connecting pipe 40 communicates with a discharge port 12, and the confluence member 50 has a connecting channel and a spray port. The other end of each connecting pipe 40 away from the discharge port 12 communicates with the connecting channel, and the spray port communicates with the connecting channel.

[0037] Among them, the fire extinguishing agents stored in any two storage cavities 13 are different.

[0038] With the above fire extinguishing device, when the lithium battery has a thermal runaway, the power member 30 acts to drive the piston 20 to move toward the discharge port 12. The movement of the piston 20 toward the discharge port 12 can squeeze the fire extinguishing agent stored in the storage cavity 13 so that the fire extinguishing agent is discharged from the discharge port 12, and then is sprayed out through the connecting pipe 40, the connecting channel and the spray port to extinguish the fire. And in different stages of the thermal runaway, different power members 30 act, corresponding to driving different pistons 20 to move, so that different fire extinguishing agents are sprayed out. In this way, it can be sprayed multiple times during the thermal runaway process, and different fire extinguishing agents can be sprayed each time for different stages of the thermal runaway, effectively improving the fire extinguishing efficiency.

[0039] It can be understood that the number of the inner cavities 11, the discharge ports 12, the pistons 20, the power components 30 and the connecting pipes 40 are the same.

[0040] In addition, it should be noted that the thermal runaway of a lithium battery can be divided into multiple stages. At different stages, different typical gases or smokes will overflow from the lithium battery. Therefore, different fire extinguishing agents can be sprayed according to different stages of the thermal runaway of the lithium battery to improve the fire extinguishing efficiency of the fire extinguishing agent.

[0041] It should be explained that the fire extinguishing efficiency means ensuring a better fire extinguishing effect under the same dosage, or having a longer suppression time for thermal runaway under the same dosage. And the typical gas is the gas that is generated the most in this stage.

[0042] In some embodiments, the number of the inner cavities 11 is three, and the corresponding numbers of the discharge ports 12, the pistons 20, the power components 30 and the connecting pipes 40 are all three. The three inner cavities 11 are the first inner cavity 11, the second inner cavity 11 and the third inner cavity 11, the three discharge ports 12 are the first discharge port 12, the second discharge port 12 and the third discharge port 12, the three pistons 20 are the first piston 20, the second piston 20 and the third piston 20, and the three connecting pipes 40 are the first connecting pipe 40, the second connecting pipe 40 and the third connecting pipe 40.

[0043] The first piston 20 is arranged in the first inner cavity 11 to divide the first inner cavity 11 into a first storage cavity 13 and a first power cavity 14. The second piston 20 is arranged in the second inner cavity 11 to divide the second inner cavity 11 into a second storage cavity 13 and a second power cavity 14. The third piston 20 is arranged in the third inner cavity 11 to divide the third inner cavity 11 into a third storage cavity 13 and a third power cavity 14.

[0044] It can be understood that the first piston 20, the second piston 20 and the third piston 20 can reciprocate in the first inner cavity 11, the second inner cavity 11 and the third inner cavity 11 respectively, and the first storage cavity 13 and the first power cavity 14 are not communicated with each other, the second storage cavity 13 and the second power cavity 14 are not communicated with each other, and the third storage cavity 13 and the third power cavity 14 are not communicated with each other.

[0045] In addition, the first discharge port 12 is communicated with the first storage cavity 13. One end of the first connecting pipe 40 is communicated with the first discharge port 12. The second discharge port 12 is communicated with the second storage cavity 13. One end of the second connecting pipe 40 is communicated with the second discharge port 12. The third discharge port 12 is communicated with the third storage cavity 13. One end of the third connecting pipe 40 is communicated with the third discharge port 12.

[0046] Furthermore, it can be determined that the first power member 30 is disposed in the first power chamber 14, the second power member 30 is disposed in the second power chamber 14, and the third power member 30 is disposed in the third power chamber 14 to respectively provide power to the first piston 20, the second piston 20, and the third piston 20, so that the first piston 20, the second piston 20, and the third piston 20 move toward the first discharge port 12, the second discharge port 12, and the third discharge port 12 respectively, thereby squeezing and ejecting the fire extinguishing agent in the first storage chamber 13, the second storage chamber 13, and the third storage chamber 13 respectively.

[0047] It should be noted that in this embodiment, the process of thermal runaway of the lithium battery is roughly divided into three stages: the early stage, the middle stage, and the late stage. In the early stage of thermal runaway, the typical gas generated by the lithium battery undergoing thermal runaway is hydrogen. In the middle stage of thermal runaway, the typical gas generated by the lithium battery undergoing thermal runaway is carbon monoxide. In the late stage of thermal runaway, the lithium battery undergoing thermal runaway will generate a large amount of smoke.

[0048] Therefore, in the early stage, the first power member 30 can be used to push the first piston 20 to squeeze and eject the fire extinguishing agent in the first storage chamber 13. In the middle stage, the second power member 30 can be used to push the second piston 20 to squeeze and eject the fire extinguishing agent in the second storage chamber 13. In the late stage, the third power member 30 can be used to push the third piston 20 to squeeze and eject the fire extinguishing agent in the third storage chamber 13.

[0049] In some embodiments, the fire extinguishing device further includes a controller and a first detector. The controller is electrically connected to the first detector and the first power member 30. The first detector is used to detect the first gas, and the controller is used to control the operation of the first power member 30 according to the detection information of the first detector.

[0050] In this embodiment, the first gas is hydrogen, and the first detector is a hydrogen sensor. In the early stage of thermal runaway, when the first detector detects that the content of hydrogen reaches a certain concentration, the controller controls the activation of the first power member 30, thereby ejecting the fire extinguishing agent in the first storage chamber 13 to inert the space in the battery box and inhibit the further development of thermal runaway.

[0051] In some embodiments, the fire extinguishing device further includes a second detector. The controller is also electrically connected to the second detector and the second power member 30. The second detector is used to detect the second gas, and the controller is also used to control the operation of the second power member 30 according to the detection information of the second detector.

[0052] In this embodiment, the second gas is carbon monoxide, and the second detector is a carbon monoxide sensor. In the middle stage of thermal runaway, when the second detector detects that the content of carbon monoxide reaches a certain concentration, the controller controls the operation of the second power member 30, thereby ejecting the fire extinguishing agent in the second storage chamber 13 to reduce the temperature of the lithium battery and prevent thermal spread.

[0053] In some embodiments, the fire extinguishing device further includes a temperature sensor. The controller is also electrically connected to the temperature sensor and the third power member 30. The controller is further configured to control the operation of the third power member 30 according to the temperature information detected by the temperature sensor, so as to eject the fire extinguishing agent in the third storage chamber 13 to rapidly cool the lithium battery and prevent the lithium battery from reigniting of combustible gases (such as hydrogen, carbon monoxide, etc.) and combustible particles (such as smoke).

[0054] In this embodiment, the number of temperature sensors includes multiple, and each lithium battery in the battery box is correspondingly provided with a temperature sensor. The operation of the third power member 30 can be controlled by monitoring the temperature of the lithium battery adjacent to the lithium battery that has experienced thermal runaway.

[0055] Of course, it is also possible that the controller is directly electrically connected to the battery management system to accurately determine the position of the lithium battery that has experienced thermal runaway.

[0056] In some embodiments, the inner cavities 11 include four, and the corresponding number of the discharge ports 12, pistons 20, power members 30, and connecting pipes 40 are all three. That is, in addition to the inner cavity 11, discharge port 12, etc. described in the above embodiments, it also includes a fourth inner cavity 11, a fourth discharge port 12, a fourth piston 20, a fourth power member 30, and a fourth connecting pipe 40.

[0057] Specifically, the fourth piston 20 is disposed in the fourth inner cavity 11 to divide the fourth inner cavity 11 into a fourth storage chamber 13 and a fourth power chamber 14. The fourth power member 30 is disposed in the fourth power chamber 14. The fourth discharge port 12 is communicated with the fourth storage chamber 13, and one end of the fourth connecting pipe 40 is communicated with the fourth discharge port 12.

[0058] In some embodiments, the controller is also electrically connected to the fourth power member 30 to control the operation of the fourth power member 30, so as to eject the fire extinguishing agent in the fourth storage chamber 13 to inert the space in the battery box again and rapidly cool the lithium battery, further preventing the lithium battery from reigniting of combustible gases (such as hydrogen, carbon monoxide, etc.) and combustible particles (such as smoke).

[0059] In practical applications, the time interval between the operations of the second power member 30 and the third power member 30 is the same as the time interval between the operations of the third power member 30 and the fourth power member 30.

[0060] Wherein, the time interval can be obtained through multiple experiments and is not limited herein.

[0061] It can be understood that in this embodiment, the fourth injection is set to further ensure the fire extinguishing effect and prevent the spread of thermal runaway. Both the third injection and the fourth injection play the roles of quickly cooling down and preventing re-ignition. In order to extend the suppression effect and leave enough time for fire fighting and rescue.

[0062] In addition, it should be noted that in this embodiment, the action of the fourth power member 30 can also be controlled by monitoring the temperature of the lithium battery. Specifically, when the temperature does not reach the preset threshold, the third injection and the fourth injection are carried out at a preset time interval, and when the temperature reaches the preset threshold, the controller directly controls the third action member or the fourth action member to act.

[0063] In some embodiments, the fire extinguishing agent includes one or more mixtures of perfluorohexanone, 2-bromo-3,3,3-trifluoropropene or deionized water. That is, the fire extinguishing agent stored in each storage cavity 13 is one or more mixtures of the above.

[0064] It should be explained that the multiple mixtures refer to the composite fire extinguishing agent formed by mixing two or three of perfluorohexanone, 2-bromo-3,3,3-trifluoropropene or deionized water. In addition, the fire extinguishing agent used in different stages can be determined through multiple experiments and is not limited here.

[0065] When three injections are used:

[0066] In the case where the lithium battery model is NCM523, 1 kilogram of fire extinguishing agent is stored in the first storage cavity 13, and 3 kilograms of fire extinguishing agent are stored in both the second storage cavity 13 and the third storage cavity 13;

[0067] In the case where the lithium battery model is NCM622, 1 kilogram of fire extinguishing agent is stored in the first storage cavity 13, 4 kilograms of fire extinguishing agent are stored in the second storage cavity 13, and 3 kilograms of fire extinguishing agent are stored in the third storage cavity 13;

[0068] In the case where the lithium battery model is NCM811, 1 kilogram of fire extinguishing agent is stored in the first storage cavity 13, 5 kilograms of fire extinguishing agent are stored in the second storage cavity 13, and 4 kilograms of fire extinguishing agent are stored in the third storage cavity 13.

[0069] When four injections are used:

[0070] In the case where the lithium battery model is NCM523, 1 kilogram of fire extinguishing agent is stored in the first storage cavity 13, and 3 kilograms of fire extinguishing agent are stored in each of the second storage cavity 13, the third storage cavity 13 and the fourth storage cavity 13;

[0071] When the lithium battery model is NCM622, 1 kilogram of fire extinguishing agent is stored in the first storage chamber 13, 3 kilograms of fire extinguishing agent is stored in the second storage chamber 13, and 2 kilograms of fire extinguishing agent is stored in each of the third storage chamber 13 and the fourth storage chamber 13;

[0072] When the lithium battery model is NCM811, 1 kilogram of fire extinguishing agent is stored in the first storage chamber 13, 5 kilograms of fire extinguishing agent is stored in the second storage chamber 13, and 2 kilograms of fire extinguishing agent is stored in each of the third storage chamber 13 and the fourth storage chamber 13.

[0073] In some embodiments, the fire extinguishing device further includes at least two connecting valves 60, each connecting valve 60 is arranged at a discharge port 12, and one end of each connecting pipe 40 is communicated with the connecting valve 60. When it is necessary to spray the fire extinguishing agent in a certain storage chamber 13, open the connecting valve 60 corresponding to the storage chamber 13, and then start the corresponding power member 30.

[0074] In practical applications, the connecting valve 60 is a solenoid valve, and each connecting valve 60 is electrically connected to the controller.

[0075] In some embodiments, the power member 30 is a gas generator.

[0076] In some embodiments, the fire extinguishing device further includes a nozzle, which is connected to the confluence member 50 and communicated with the injection port.

[0077] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0078] The above-described embodiments merely represent several implementation manners of the present invention. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. A fire extinguishing device, characterized in that, Comprising: A storage member having at least two inner cavities and at least two discharge ports; At least two pistons, with one piston disposed in each inner cavity, the piston being used to divide the inner cavity into a non-communicating storage cavity and a power cavity, and each piston being reciprocally movable along the arrangement direction of the storage cavity and the power cavity, and each discharge port communicating with one end of the storage cavity away from the power cavity; At least two power members, with one power member disposed in each power cavity, each power member being used to provide power for one piston to move towards the discharge port; At least two connecting pipes, with one end of each connecting pipe communicating with one discharge port; and A confluence member having a connecting channel and a jet port, with the other end of each connecting pipe away from the discharge port communicating with the connecting channel, and the jet port communicating with the connecting channel; A nozzle, the nozzle being connected to the confluence member and communicating with the jet port; At least two of the power members include a first power member, a second power member, and a third power member; A temperature sensor, the temperature sensor being electrically connected to a controller, the controller being used to control the operation of the third power member according to the temperature information detected by the temperature sensor; A first detector, the first detector being used to detect a first gas, the controller being used to control the operation of the first power member according to the detection information of the first detector; A second detector, the second detector being used to detect a second gas, the controller being further used to control the operation of the second power member according to the detection information of the second detector; Wherein, each storage cavity is used to store a fire extinguishing agent, and the fire extinguishing agents stored in any two storage cavities are different.

2. The fire extinguishing device according to claim 1, characterized in that, At least two of the discharge ports include a first discharge port, a second discharge port, and a third discharge port, at least two of the pistons include a first piston, a second piston, and a third piston, and at least two of the connecting pipes include a first connecting pipe, a second connecting pipe, and a third connecting pipe; At least two of the inner cavities include a first inner cavity, a second inner cavity, and a third inner cavity; The first piston is disposed in the first inner cavity to divide the first inner cavity into a first storage cavity and a first power cavity, the second piston is disposed in the second inner cavity to divide the second inner cavity into a second storage cavity and a second power cavity, and the third piston is disposed in the third inner cavity to divide the third inner cavity into a third storage cavity and a third power cavity; The first discharge port communicates with the first storage cavity, one end of the first connecting pipe communicates with the first discharge port, the second discharge port communicates with the second storage cavity, one end of the second connecting pipe communicates with the second discharge port, the third discharge port communicates with the third storage cavity, and one end of the third connecting pipe communicates with the third discharge port.

3. The fire extinguishing device according to claim 2, characterized in that, The controller is electrically connected to the first detector and the first power member.

4. The fire extinguishing device according to claim 3, characterized in that, The controller is further electrically connected to the second detector and the second power member.

5. The fire extinguishing device according to claim 4, characterized in that, At least two of the inner cavities further include a fourth inner cavity, at least two of the discharge ports further include a fourth discharge port, at least two of the pistons further include a fourth piston, at least two of the power members further include a fourth power member, and at least two of the connecting pipes further include a fourth connecting pipe; The fourth piston is disposed in the fourth inner cavity to divide the fourth inner cavity into a fourth storage cavity and a fourth power cavity. The fourth power member is disposed in the fourth power cavity, and the fourth discharge port communicates with the fourth storage cavity. One end of the fourth connecting pipe communicates with the fourth discharge port; The controller is further electrically connected to the third power member and the fourth power member to control the operations of the third power member and the fourth power member, and the time intervals between the operations of the second power member and the third power member and between the operations of the third power member and the fourth power member are the same.

6. The fire extinguishing device according to claim 1, characterized in that, The fire extinguishing device further includes at least two connecting valves. Each connecting valve is disposed at one of the discharge ports, and one end of each connecting pipe communicates with the connecting valve.

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