Fire extinguishing device for low-voltage switch cabinet

Abstract

The invention relates to the technical field of low-voltage switch cabinets, and particularly discloses a low-voltage switch cabinet fire extinguishing device which comprises a cabinet shell, a fire extinguishing assembly, an exhaust assembly, a sensor and a controller. The sensor is arranged in the cabinet shell and is used for sensing whether a fire breaks out in the cabinet shell or not; the exhaust assembly comprises a first fan and a second fan; the first fan and the second fan are respectively arranged on two sides of the cabinet shell; the controller is arranged on the cabinet shell and is electrically connected with the sensor, the valve, the first fan and the second fan; the sensor is used for sending a fire signal to the controller when sensing fire in the cabinet shell; the controller is used for controlling the valve to be opened and controlling the first fan and the second fan to be started when receiving a fire signal. When a fire source appears in the cabinet shell, the first fan and the second fan can exhaust high-temperature gas, and the fire extinguishing assembly can extinguish the fire source, so that fire spreading is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of low-voltage switch cabinets, and in particular to a fire extinguishing device for a low-voltage switch cabinet. Background Art

[0002] Low-voltage switchgear is suitable for power plants, petroleum, chemical, metallurgy, textile, high-rise buildings and other industries, and can be used for power transmission, distribution and power conversion. Specifically, low-voltage switchgear has multiple functions and important significance in the power system. It can distribute electric energy to different circuits, and can also convert voltage and current to meet the power needs of different equipment. In addition, the low-voltage switchgear can control the start, stop and operation of the motor to ensure the normal operation of the motor. At the same time, it can provide reactive power compensation, improve the power factor of the power system, and reduce power loss. It itself has the function of preventing electric shock. Through isolation and grounding measures, it protects equipment and operators from electric shock. The low-voltage switchgear can ensure the stable operation of the power system and reduce the possibility of failures through reasonable electrical connections and protection measures.

[0003] However, in daily operation, short circuits caused by overheating of low-voltage switches or user failure to go out often occur. In serious cases, fires may even occur, causing the low-voltage cabinet to burn. If the fire is not discovered in time, it will cause large-scale power outages and damage the transformer.

[0004] When a fire occurs in a traditional low-voltage switch cabinet due to abnormal conditions such as overheating or short circuit, the fire source cannot be dealt with promptly and effectively, causing the fire source to cause a larger fire or even explosion after a certain period of time; therefore, when a fire occurs in a traditional low-voltage switch cabinet, the losses caused are often large. Summary of the invention

[0005] In view of this, the purpose of the present application is to provide a low-voltage switch cabinet fire extinguishing device to solve the problem that the existing low-voltage switch cabinet cannot control the fire source in time when a fire occurs.

[0006] In order to achieve the above technical objectives, the present application provides a low-voltage switch cabinet fire extinguishing device, including: a cabinet housing, a fire extinguishing component, an exhaust component, a sensor and a controller;

[0007] The sensor is arranged in the cabinet housing and is used to sense whether there is a fire in the cabinet housing;

[0008] The fire extinguishing assembly comprises: a fire extinguishing base material bottle, a delivery branch pipe and a spray head;

[0009] The fire extinguishing base material bottle is arranged in the cabinet housing;

[0010] One end of the delivery branch pipe is connected to the fire extinguishing base material bottle, and the other end is connected to the injection head;

[0011] The spray head is arranged at the top end inside the cabinet shell;

[0012] The delivery branch pipe is provided with a valve;

[0013] The exhaust assembly includes: a first fan and a second fan;

[0014] The first fan and the second fan are respectively arranged on two sides of the cabinet shell;

[0015] The controller is disposed in the cabinet housing and is electrically connected to the sensor, the valve, the first fan and the second fan;

[0016] The sensor is used to send a fire signal to the controller when sensing a fire in the cabinet housing;

[0017] The controller is used for controlling the valve to open and the first fan and the second fan to start when receiving the fire signal.

[0018] Furthermore, the fire extinguishing base material bottle contains carbon dioxide base material.

[0019] Furthermore, the cabinet housing is provided with a cabinet door that can be opened and closed;

[0020] The cabinet door is sealed and connected to the cabinet shell.

[0021] Furthermore, the cabinet shell includes a middle layer and side layers located on both sides of the middle layer;

[0022] The middle layer is used to install electrical devices;

[0023] The injection head is connected to the top of the middle layer;

[0024] The bottom of the middle layer is connected to the side layer;

[0025] The first fan and the second fan are respectively connected to the tops of the two side layers.

[0026] Furthermore, a temperature sensor is provided on the cabinet housing;

[0027] The temperature sensor is used to sense the temperature value inside the cabinet shell;

[0028] The temperature sensor is electrically connected to the controller;

[0029] The controller is used to start the first fan and / or the second fan when the temperature value in the cabinet housing exceeds a preset temperature value.

[0030] Furthermore, a lighting lamp is arranged in the cabinet shell.

[0031] Furthermore, a photosensitive sensor is provided on the outer wall of the cabinet shell;

[0032] The photosensor is electrically connected to the lighting lamp.

[0033] Furthermore, a solar cell is provided on the top outer wall of the cabinet housing;

[0034] The solar cell is electrically connected to the photosensor and the lighting lamp.

[0035] Furthermore, a signal transmitter and an alarm light are provided on the outside of the cabinet housing;

[0036] The signal transmitter and the warning light are both electrically connected to the controller;

[0037] The controller is used to control the signal transmitter to send the fire signal to the control terminal and control the alarm light to turn on when receiving the fire signal.

[0038] Furthermore, the cabinet housing is provided with a cabinet door that can be opened and closed;

[0039] An observation window is arranged on the cabinet door.

[0040] It can be seen from the above technical scheme that the present application provides a low-voltage switch cabinet fire extinguishing device, comprising: a cabinet shell, a fire extinguishing component, an exhaust component, a sensor and a controller; the sensor is arranged in the cabinet shell, and is used to sense whether there is a fire in the cabinet shell; the fire extinguishing component comprises: a fire extinguishing base material bottle, a delivery branch pipe and a spray head; the fire extinguishing base material bottle is arranged in the cabinet shell; one end of the delivery branch pipe is connected to the fire extinguishing base material bottle, and the other end is connected to the spray head; the spray head is arranged at the top of the cabinet shell; a valve is arranged on the delivery branch pipe; the exhaust component comprises: a first fan and a second fan; the first fan and the second fan are respectively arranged on both sides of the cabinet shell; the controller is arranged in the cabinet shell, and is electrically connected to the sensor, the valve, the first fan and the second fan; the sensor is used to send a fire signal to the controller when sensing a fire in the cabinet shell; the controller is used to control the valve to open and control the first fan and the second fan to start when receiving the fire signal.

[0041] In this solution, the sensor can monitor the fire situation inside the cabinet shell. When a fire source appears, the first fan and the second fan can be started at the same time to quickly discharge the high-temperature gas inside the cabinet shell, avoiding the temperature inside the cabinet shell from rising rapidly in a short period of time. At the same time, the fire source can be extinguished in conjunction with the fire extinguishing component to prevent the fire from spreading, effectively solving the problem that the existing low-voltage switch cabinet cannot control the fire source in time when a fire occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 A schematic diagram of the overall structure of a low-voltage switch cabinet fire extinguishing device provided in an embodiment of the present application;

[0044] Figure 2 A schematic diagram of the structure of a low-voltage switch cabinet fire extinguishing device provided in an embodiment of the present application with the cabinet door removed;

[0045] Figure 3 A schematic diagram of a fire extinguishing cabinet of a low-voltage switch cabinet fire extinguishing device provided in an embodiment of the present application;

[0046] Figure 4 A top view of a low-voltage switch cabinet fire extinguishing device provided in an embodiment of the present application;

[0047] Figure 5 Provided in the embodiments of this application Figure 1 A magnified view of part B in FIG.

[0048] Figure 6 Provided in the embodiments of this application Figure 1 A magnified view of part A

[0049] Figure 7 A schematic diagram of a low-voltage switch cabinet fire extinguishing device provided in another embodiment of the present application;

[0050] In the figure: 1, cabinet shell; 2, cabinet door; 3, first observation window; 4, ventilation slot; 5, fire cabinet; 6, programmable pulse controller; 7, middle layer; 8, control cabinet; 9, installation rod; 10, relay; 11, layered line pipe; 12, output cable; 13, fire extinguishing base material bottle; 14, induction probe; 15, temperature sensor; 16, signal controller; 17, first installation cover; 18, first fan; 19, flip door; 20, hinge; 21, door handle; 22, second observation window; 23, conveyor In charge; 24. Valve; 25. Sensor; 26. Controller; 27. Fire delivery pipe; 28. Lighting; 29. ​​Spray head; 30. Second fan; 31. Second mounting cover; 32. Fan controller; 33. Central control cabinet; 34. Alarm light; 35. Signal transmitter; 36. Transmitting antenna; 37. Sensor base; 38. Photosensitive sensor; 39. Connecting line; 40. Solar cell; 41. Solar photovoltaic panel; 42. Fire spray gun; 43. Mounting base; 44. Limit plate; 45. Side layer. DETAILED DESCRIPTION

[0051] The technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the specification of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection requested by the present application.

[0052] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application 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, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0053] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a replaceable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0054] See also Figures 1 to 3A low-voltage switch cabinet fire extinguishing device provided in an embodiment of the present application includes: a cabinet housing 1, a fire extinguishing component, an exhaust component, a sensor 25 and a controller 26.

[0055] The sensor 25 is disposed in the cabinet housing 1, and is used to sense whether there is a fire in the cabinet housing 1. In the embodiment provided in the present application, the sensor 25 may be, for example, a photoelectric sensor, which can monitor the smoke concentration by monitoring the light scattering effect of smoke particles, thereby realizing the monitoring of whether there is a fire. The sensor 25 may also be, for example, an ion sensor, which can monitor the changes in ionized particles in the air to determine whether there is a fire. The sensor 25 may also be a differential constant temperature composite sensor, which can monitor the temperature change rate in the cabinet housing 1 and monitor whether the temperature reaches a threshold.

[0056] The fire extinguishing assembly includes: a fire extinguishing base material bottle 13, a delivery branch pipe 23 and a spray head 29; the fire extinguishing base material bottle 13 is arranged in the cabinet housing 1; the fire extinguishing base material is stored in the fire extinguishing base material bottle 13, wherein the fire extinguishing base material can be liquid carbon dioxide or dry powder. One end of the delivery branch pipe 23 is connected to the fire extinguishing base material bottle 13, and the other end is connected to the spray head 29, which is used to transport the fire extinguishing base material to the spray head 29 and then spray it out through the spray head 29. The spray head 29 is arranged at the top of the cabinet housing 1.

[0057] A valve 24 is provided on the delivery branch pipe 23; wherein the valve 24 is an electrically controlled valve, which can be provided at the outlet of the fire extinguishing base material bottle 13, that is, at the inlet of the delivery branch pipe 23, or at the middle of the delivery branch pipe 23. In this embodiment, the valve 24 is provided at the end of the delivery branch pipe 34, and the output end of the valve 24 is connected to the injection head 29 through the fire delivery pipe 27.

[0058] The exhaust assembly includes: a first fan 18 and a second fan 30; the first fan 18 and the second fan 30 are respectively arranged on both sides of the cabinet shell 1; the controller 26 is arranged in the cabinet shell 1, and is electrically connected to the sensor 25, the valve 24, the first fan 18 and the second fan 30; the sensor 25 is used to send a fire signal to the controller 26 when sensing a fire in the cabinet shell 1; the controller 26 is used to control the valve 24 to open and control the first fan 18 and the second fan 30 to start when receiving the fire signal.

[0059] In this embodiment, when the low-voltage switch cabinet operates normally without fire, the first fan 18 and the second fan 30 can be started simultaneously or alternately to ventilate and exhaust the low-voltage switch cabinet, thereby avoiding heat accumulation caused by the normal operation of electrical components in the low-voltage switch cabinet. When a fire occurs in the low-voltage switch cabinet, the first fan 18 and the second fan 30 can exhaust the high-temperature gas and harmful gas generated by the combustion, thereby avoiding a rapid rise in the temperature of the equipment in the cabinet in a short period of time, thereby reducing damage to the electrical components in the event of a fire.

[0060] At the same time, when a fire occurs due to abnormal conditions such as heating or short circuit of electrical components in the low-voltage switch cabinet, the valve 24 opens, allowing the spray head 29 to spray the fire extinguishing base material downward to quickly control the fire and prevent the fire from spreading and causing a larger fire or explosion.

[0061] In one embodiment, see Figure 2 and Figure 3 The fire cabinet 5 is fixedly connected to the inner wall of the cabinet housing 1; a mounting base 43 may be provided in the fire cabinet 5; a limit plate 44 is provided above the mounting base 43 inside the fire cabinet 5. The fire extinguishing base material bottle 13 is detachably clamped on the limit plate 44 and abuts against the mounting base 43.

[0062] A hinge 20 is fixedly connected to one side outer wall of the fire cabinet 5, a flip door 19 is fixedly connected to one side outer wall of the hinge 20, a door handle 21 is fixedly connected to one side outer wall of the flip door 19, and a second observation window 22 is provided on one side outer wall of the flip door 19. The second observation window 22 is used to view the fire extinguishing base material bottle 13 in the fire cabinet 5; the fire extinguishing base material bottle 13 can be made of transparent material or provided with an observation port such as a stock scale bar to observe the stock of the internal fire extinguishing base material. Through the second observation window 22, it can be observed whether the fire extinguishing base material bottle 13 needs to be replaced.

[0063] When the fire extinguishing base material bottle 13 needs to be replaced, the flip door 19 is opened by turning the door handle 21. The flip door 19 is connected to the fire fighting cabinet 5 through the hinge 20. After opening, the fire extinguishing base material bottle 13 can be replaced.

[0064] In one embodiment, the output end of the fire extinguishing base material bottle 13 is fixedly connected to a fire spray gun 42, and the output end of the fire spray gun 42 is fixedly connected to the above-mentioned delivery branch pipe 23, and the delivery branch pipe 23 is sleeved on the upper surface of the fire cabinet 5. At the same time, the valve 24 is fixedly connected to the cabinet housing 1 to improve the stability of the valve 24 installation.

[0065] In one embodiment, the cabinet housing 1 is provided with a first window for installing a first fan 18 and a second window for installing a second fan 30. A first mounting cover 17 is fixedly connected to the outer end of the first fan 18, and the first mounting cover 17 is fixedly connected to one side outer wall of the cabinet housing 1. A second mounting cover 31 is fixedly connected to the outer end of the second fan 30, and the second mounting cover 31 is fixedly connected to the other side outer wall of the cabinet housing 1.

[0066] As an embodiment, a carbon dioxide base material is stored inside the fire extinguishing base material bottle 13. The carbon dioxide base material may refer to liquid carbon dioxide or a compound that can react to generate carbon dioxide, and specifically, the injection head 29 can inject carbon dioxide to extinguish the fire source in the cabinet housing 1. The carbon dioxide fire extinguishing method can reduce the damage to the electrical components in the cabinet housing 1.

[0067] In a more specific embodiment, the cabinet housing 1 is provided with an openable and closable cabinet door 2 ; the cabinet door 2 is sealedly connected to the cabinet housing 1 .

[0068] Specifically, except for the cabinet door 2, the first window and the second window, the rest of the cabinet housing 1 is a sealed structure. When the cabinet door 2 is closed, the ventilation structure in the cabinet housing 1 is the first window and the second window.

[0069] In daily use, the first fan 18 and the second fan 30 can be used alternately, or one can be in the suction state and the other can be in the exhaust state, so as to realize ventilation and heat dissipation for the low-voltage switch cabinet.

[0070] When a fire occurs inside the low-voltage switch cabinet, the first fan 18 and the second fan 30 both enter the blowing state, so that the original gas inside the cabinet shell 1 can be quickly discharged; when the injection head 29 continues to output carbon dioxide, the diffusion of carbon dioxide can be accelerated and the oxygen content in the cabinet shell 1 can be reduced, thereby achieving a better fire extinguishing effect.

[0071] As a further improvement, see Figure 1 The cabinet shell 1 includes a middle layer 7 and side layers 45 located on both sides of the middle layer 7; the middle layer 7 is used to install electrical components; the injection head 29 is connected to the top of the middle layer 7; the bottom of the middle layer 7 is connected to the side layer 45; the first fan 18 and the second fan 30 are respectively connected to the tops of the two side layers 45.

[0072] When a fire occurs in the low-voltage switch cabinet, the injection head 29 outputs carbon dioxide downward, and the first fan 18 and the second fan 30 are started; the original gas in the middle layer 7 flows downward along the middle layer 7 and then upward along the side layer 45, and finally discharged from the first window and the second window. The structure of the middle layer 7 and the side layer 45 can prevent carbon dioxide from being discharged before it fills the electrical components, thereby ensuring the fire extinguishing effect in the cabinet.

[0073] In one embodiment, the middle layer 7 is provided with: a control cabinet 8; the control cabinet 8 may be a structure capable of ventilation from top to bottom, so that the injection head 29 can spray carbon dioxide into the interior thereof. A programmable pulse controller 6 is provided in the control cabinet 8, and an output cable 12 is fixedly connected to the lower surface of the programmable pulse controller 6, and a layered line tube 11 is fixedly connected to the output end of the output cable 12, and the layered line tube 11 is provided in the control cabinet 8. The programmable pulse controller 6 is used to control the electrical components in the control cabinet 8. A mounting rod 9 is fixedly connected to the inner wall of the cabinet housing 1, and a relay 10 is fixedly connected to the outer wall on one side of the mounting rod 9, and the mounting rod 9 is used to install the relay 10.

[0074] During operation, various pulse reversing valves in the control cabinet 8 are controlled by the programmable pulse controller 6 on the control cabinet 8. The programmable pulse controller 6 is connected to the layered line pipe 11 through the output cable 12. The layered line pipe 11 is connected to the bottom relay 10 through the control cabinet 8. The relay 10 can effectively control the start and stop of the programmable pulse controller 6. The relay 10 is installed through the mounting rod 9.

[0075] In one embodiment, a temperature sensor 15 is provided on the cabinet housing 1; the temperature sensor 15 is used to sense the temperature value inside the cabinet housing 1; the temperature sensor 15 is electrically connected to the controller 26; the controller 26 is used to start the first fan 18 and / or the second fan 30 when the temperature value inside the cabinet housing 1 exceeds a preset temperature value.

[0076] Specifically, the outer wall of the cabinet housing 1 may be fixedly connected with a signal controller 16, which is electrically connected to the temperature sensor 15 and the controller 26. The lower surface of the temperature sensor 15 senses the temperature inside the cabinet through a sensing probe 14 extending into the cabinet housing 1.

[0077] Correspondingly, the second fan 30 is electrically connected to a fan controller 32 ; the fan controller 32 is fixed on the outer wall of the cabinet housing 1 .

[0078] When the temperature inside the cabinet housing 1 is lower than the preset temperature value, the controller 26 controls the fan to be in a stopped state; when the temperature inside the cabinet housing 1 exceeds the preset temperature, the controller 26 transmits a high temperature signal to the signal controller 16, and after the signal controller 16 and the fan controller 32 convert the data, the controller 26 controls the first fan 18 and the second fan 30 to start. In addition, the fan running speed can be controlled according to different set thresholds of the temperature, so as to effectively control the temperature inside the cabinet.

[0079] It should be noted that, in actual applications, controlling two fans to start alternately, rotate forward and reverse, or rotate at different speeds to perform ventilation and heat dissipation is a prior art, and is therefore not described in detail in this embodiment.

[0080] In one embodiment, see Figure 1 , Figure 4 and Figure 5 An illumination lamp 28 is arranged in the cabinet housing 1 .

[0081] The lighting lamp 28 can provide a lighting environment for the staff in the case of insufficient light.

[0082] In one embodiment, a photosensitive sensor 38 is disposed on the outer wall of the cabinet housing 1; the photosensitive sensor 38 is electrically connected to the lighting lamp 28. In application, a sensor base 37 is fixedly connected to the upper surface of the cabinet housing 1, and the photosensitive sensor 38 is disposed on the sensor base 37.

[0083] The photosensitive sensor 38 is used to monitor the light intensity of the environment in which the cabinet is located. Through the photosensitive sensor 38, when there is insufficient light outside the cabinet housing 1, the photosensitive sensor 38 can control the lighting lamp 28 to automatically turn on. Among them, the photosensitive sensor 38 can be connected to the lighting lamp 28 through a connecting line 39.

[0084] In one embodiment, a solar cell 40 is disposed on the top outer wall of the cabinet housing 1 ; the solar cell 40 is electrically connected to the photosensor 38 and the lighting lamp 28 .

[0085] Specifically, a solar photovoltaic panel 41 is disposed on the solar cell 40. The solar cell 40 can convert light energy through the solar photovoltaic panel 41 when the sun is shining, thereby saving the consumption of electric energy inside the solar cell 40 to a certain extent.

[0086] In one embodiment, a signal transmitter 35 and an alarm light 34 are provided on the outside of the cabinet housing 1; the signal transmitter 35 and the alarm light 34 are both electrically connected to the controller 26; the controller 26 is used to control the signal transmitter 35 to send a fire signal to the control terminal and control the alarm light 34 to turn on when receiving a fire signal.

[0087] The control terminal may be a mobile phone of a bound staff member or a computer in a control room. The signal transmitter 35 is provided with a transmitting antenna 36. A central control cabinet 33 may be provided at a position corresponding to the controller 26 outside the cabinet housing 1, and the central control cabinet 33 is electrically connected to the controller 26, and is also electrically connected to the alarm light 34 and the signal transmitter 35.

[0088] When the sensor 25 detects a fire inside the cabinet shell 1, it transmits a signal to the controller 26, which then controls the alarm light 34 to send out an alarm signal, and controls the signal transmitter 35 to send the fire information to the control terminal, so that the staff can understand the abnormal temperature situation in time; wherein, the signal transmitter 35 sends the signal through the transmitting antenna 36.

[0089] In the gas examples provided in this application, please refer to Figure 7 The cabinet housing 1 is provided with an openable and closable cabinet door 2; the cabinet door 2 is provided with an observation window 3.

[0090] The observation window 3 is used to view the electronic components in the cabinet.

[0091] In other embodiments, when there is no need to accelerate the diffusion of carbon dioxide by the first fan 18 and the second fan 30, ventilation slots 4 may be provided on the cabinet door 2 to increase the ventilation effect of the low-voltage switch cabinet.

[0092] The above are only preferred embodiments of the present application and are not intended to limit the present invention. Although the present application has been described in detail with reference to the examples, those skilled in the art can still modify the technical solutions recorded in the aforementioned examples or make equivalent substitutions for some of the technical features therein. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A low voltage switch cabinet fire extinguishing device, characterized in that: include: Cabinet housing (1), fire extinguishing assembly, exhaust assembly, sensor (25) and controller (26); The sensor (25) is arranged in the cabinet housing (1) and is used to sense whether a fire occurs in the cabinet housing (1); The fire extinguishing assembly comprises: a fire extinguishing base material bottle (13), a delivery branch pipe (23) and a spray head (29); The fire extinguishing base material bottle (13) is arranged in the cabinet housing (1); One end of the delivery branch pipe (23) is connected to the fire extinguishing base material bottle (13), and the other end is connected to the injection head (29); The spray head (29) is arranged at the top end inside the cabinet housing (1); The delivery branch pipe (23) is provided with a valve (24); The exhaust assembly comprises: a first fan (18) and a second fan (30); The first fan (18) and the second fan (30) are respectively arranged on two sides of the cabinet housing (1); The controller (26) is arranged on the cabinet housing (1) and is electrically connected to the sensor (25), the valve (24), the first fan (18) and the second fan (30); The sensor (25) is used to send a fire signal to the controller (26) when sensing a fire in the cabinet housing (1); The controller (26) is used to control the valve (24) to open and control the first fan (18) and the second fan (30) to start when receiving the fire signal.

2. The low-voltage switch cabinet fire extinguishing device according to claim 1 is characterized in that: The fire extinguishing base material bottle (13) stores carbon dioxide base material inside.

3. The low-voltage switch cabinet fire extinguishing device according to claim 2 is characterized in that: The cabinet housing (1) is provided with a cabinet door (2) that can be opened and closed; The cabinet door (2) is sealedly connected to the cabinet housing (1).

4. The low-voltage switch cabinet fire extinguishing device according to claim 3 is characterized in that: The cabinet housing (1) comprises a middle layer (7) and side layers (45) located on both sides of the middle layer (7); The middle layer (7) is used for installing electrical devices; The injection head (29) is connected to the top of the middle layer (7); The bottom of the middle layer (7) is connected to the side layer (45); The first fan (18) and the second fan (30) are respectively connected to the tops of the two side layers (45).

5. The low-voltage switch cabinet fire extinguishing device according to claim 1 is characterized in that: The cabinet housing (1) is provided with a temperature sensor (15); The temperature sensor (15) is used to sense the temperature value inside the cabinet housing (1); The temperature sensor (15) is electrically connected to the controller (26); The controller (26) is used to start the first fan (18) and / or the second fan (30) when the temperature value in the cabinet housing (1) exceeds a preset temperature value.

6. The low-voltage switch cabinet fire extinguishing device according to claim 1 is characterized in that: An illumination lamp (28) is arranged inside the cabinet housing (1).

7. The low-voltage switch cabinet fire extinguishing device according to claim 6 is characterized in that: A photosensitive sensor (38) is provided on the outer wall of the cabinet housing (1); The photosensor (38) is electrically connected to the lighting lamp (28).

8. The low-voltage switch cabinet fire extinguishing device according to claim 7 is characterized in that: A solar cell (40) is provided on the top outer wall of the cabinet housing (1); The solar cell (40) is electrically connected to the photosensor (38) and the lighting lamp (28).

9. The low-voltage switch cabinet fire extinguishing device according to claim 1, characterized in that: A signal transmitter (35) and an alarm light (34) are arranged outside the cabinet housing (1); The signal transmitter (35) and the warning light (34) are both electrically connected to the controller (26); The controller (26) is used to control the signal transmitter (35) to send the fire signal to the control terminal and control the alarm light (34) to turn on when receiving the fire signal.

10. The low-voltage switch cabinet fire extinguishing device according to claim 1, characterized in that: The cabinet housing (1) is provided with a cabinet door (2) that can be opened and closed; An observation window (3) is provided on the cabinet door (2).

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