Fire extinguishing device and power distribution cabinet

Abstract

The utility model discloses a fire extinguishing device and a power distribution cabinet, and relates to the technical field of fire extinguishing equipment, the fire extinguishing device comprises a box body, a cover body and a fire extinguishing layer, the box body is provided with an accommodating groove, and the accommodating groove is used for accommodating a terminal strip; the cover body is detachably connected with the box body, so that the cover body can cover or expose the notch of the accommodating groove; the fire extinguishing layer is arranged on the side, facing the containing groove, of the cover body, is used for facing the terminal strip, and can release fire extinguishing gas when the temperature of the terminal strip exceeds the preset temperature. The terminal strip is placed in the containing groove of the box body, then the containing groove is covered with the cover body, the fire extinguishing layer faces the terminal strip located in the containing groove, and if the terminal strip is overheated or short-circuited and the temperature of the terminal strip rises to the preset temperature, the fire extinguishing layer can generate fire extinguishing gas to extinguish fire and cool the terminal strip in the containing groove. Therefore, a fire source is quickly inhibited at the initial stage of overheating or short circuit of the terminal strip, and fire diffusion is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of fire extinguishing equipment, in particular to a fire extinguishing device and a power distribution cabinet. Background Art

[0002] At present, the terminal blocks of existing distribution cabinets are generally only equipped with protective covers for dust and electric shock prevention. However, when the terminal block catches fire, the existing distribution cabinet is usually unable to find the fire source in the first time, which leads to the spread and expansion of the fire, aggravated losses, and increased difficulty in subsequent fire extinguishing. Existing terminal block fires are usually extinguished manually using fire extinguishers. After discovering that the terminal block is on fire, personnel need to take the fire extinguisher and rush to the fire point. This process also takes a lot of time, which leads to the spread of the fire. Utility Model Content

[0003] The main purpose of the utility model is to provide a fire extinguishing device and a power distribution cabinet, aiming to improve the efficiency of extinguishing fires caused by terminal blocks of existing power distribution cabinets.

[0004] In order to achieve the above-mentioned purpose, the fire extinguishing device proposed by the utility model comprises:

[0005] A box body, wherein the box body is provided with a receiving groove, and the receiving groove is used to receive the terminal block;

[0006] A cover body, the cover body is detachably connected to the box body so that the cover body can cover or expose the notch of the receiving groove;

[0007] A fire extinguishing layer is arranged on a side of the cover body facing the receiving groove, the fire extinguishing layer is used to be arranged toward the terminal block, and the fire extinguishing layer can release fire extinguishing gas when the temperature of the terminal block exceeds a preset temperature.

[0008] In one embodiment, the fire extinguishing layer includes a main body layer and a barrier layer covering the periphery of the main body layer, and the side of the barrier layer facing away from the receiving groove is arranged on the side of the cover body facing the receiving groove; the main body layer includes an adhesive layer and a plurality of fire extinguishing capsules arranged on the adhesive layer; when the temperature of the terminal row exceeds the preset temperature, the barrier layer melts and the fire extinguishing capsules release fire extinguishing gas.

[0009] In one embodiment, the fire extinguishing layer is provided in a sheet-like structure;

[0010] And / or, a side of the barrier layer facing away from the receiving groove is attached to a side of the cover body facing the receiving groove;

[0011] And / or, the fire extinguishing capsule is a perfluorohexanone microcapsule;

[0012] And / or, the barrier layer is a modified polyurethane barrier layer;

[0013] And / or, the thickness of the fire extinguishing layer is h1, where 0.5 mm ≤ h1 ≤ 2.5 mm;

[0014] And / or, the diameter of each fire extinguishing capsule is d, where 50 μm ≤ d ≤ 1500 μm.

[0015] In one embodiment, the fire extinguishing layer includes a fire extinguishing coating layer, the fire extinguishing coating layer includes a composite thermosensitive substrate layer and fire extinguishing capsules, the number of the fire extinguishing capsules is multiple, the multiple fire extinguishing capsules are arranged in the composite thermosensitive substrate layer, the composite thermosensitive substrate layer is arranged on the side of the cover body facing the receiving groove, the composite thermosensitive substrate layer can be vaporized when the ambient temperature reaches the release temperature and shoot the fire extinguishing capsules towards the terminal block, and the fire extinguishing capsules can release fire extinguishing gas when the temperature of the terminal block exceeds the preset temperature.

[0016] In one embodiment, the fire extinguishing layer further includes a heat conducting layer,

[0017] One side of the heat conducting layer is attached to the cover body, and the other side of the heat conducting layer is attached to the composite thermosensitive substrate layer;

[0018] Or, the number of the heat conducting layers is multiple, and the multiple heat conducting layers are embedded in the composite thermosensitive substrate layer.

[0019] In one embodiment, the thickness of the fire extinguishing coating layer is h2, where 0.2 mm ≤ h2 ≤ 1 mm;

[0020] And / or, the diameter of each fire extinguishing capsule is d, where 50 μm ≤ d ≤ 500 μm;

[0021] And / or, the fire extinguishing capsule is a perfluoroketone microcapsule;

[0022] And / or, the composite thermosensitive substrate layer is attached to the side of the cover body facing the receiving groove.

[0023] In one embodiment, the fire extinguishing device further includes a heating element and a temperature detecting element, the detecting end of the temperature detecting element is arranged to face the terminal block, and the temperature detecting element is electrically connected to the heating element, so that when the temperature detecting element detects that the temperature of the terminal block is higher than the preset temperature, the heating element heats the fire extinguishing layer.

[0024] In one embodiment, the cover body is a transparent cover body;

[0025] And / or, the cover body is a flame retardant cover body.

[0026] In one embodiment, an installation groove is arranged on the side of the cover body facing the receiving groove, and the fire extinguishing layer is arranged in the installation groove.

[0027] The present utility model further provides a power distribution cabinet, which includes a terminal block and the above-mentioned fire extinguishing device.

[0028] According to the technical solution of the present utility model, the terminal block is placed in the accommodation groove of the box body, and then the accommodation groove is covered by the cover body, so that the fire extinguishing layer faces the terminal block located in the accommodation groove. If the terminal block overheats or is short-circuited, the temperature of the terminal block will rise to the preset temperature, and the fire extinguishing layer will generate fire extinguishing gas to extinguish the fire and cool down the terminal block in the accommodation groove, thereby quickly suppressing the fire source in the initial stage of overheating or short-circuit of the terminal block and preventing the spread of the fire. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0030] Figure 1 Structural schematic diagram of an embodiment of the fire extinguishing device provided by the present utility model;

[0031] Figure 2 Exploded structural schematic diagram of an embodiment of the fire extinguishing device provided by the present utility model;

[0032] Figure 3 Structural schematic diagram of an embodiment of the cover body provided by the present utility model;

[0033] Figure 4 Structural schematic diagram of an embodiment of the fire extinguishing layer provided by the present utility model;

[0034] Figure 5 Structural schematic diagram of another embodiment of the fire extinguishing layer provided by the present utility model;

[0035] Figure 6 Structural schematic diagram of an embodiment in which the temperature detection element and the heating element are arranged on the cover body provided by the present utility model.

[0036] Explanation of the reference numerals in the drawings:

[0037] 100, fire extinguishing device; 1, box body; 11, accommodation groove; 12, card slot; 2, cover body; 21, installation groove; 22, card post; 3, fire extinguishing layer; 31, body layer; 311, adhesive layer; 312, fire extinguishing capsule; 32, barrier layer; 33, fire extinguishing coating layer; 34, heat conduction layer; 4, heating element; 5, temperature detection element;

[0038] 200, terminal block.

[0039] The realization, functional features and advantages of the present utility model will be further described in conjunction with embodiments and with reference to the accompanying drawings. Specific embodiments

[0040] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0041] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0042] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0043] Currently, the terminal blocks of existing power distribution cabinets are generally only equipped with protective covers for dust prevention and electric shock prevention. However, in the face of a fire in the terminal block, the existing power distribution cabinets usually cannot detect the fire source in the first place, resulting in the spread and expansion of the fire, the aggravation of losses, and the increase in the difficulty of extinguishing the subsequent fire. The existing fires in terminal blocks usually rely on manual use of fire extinguishers to extinguish them. After the personnel discover the fire in the terminal block, they still need to fetch the fire extinguisher and then rush to the fire point, which also takes a relatively long time, thus leading to the spread of the fire.

[0044] Through research by the inventor, it is found that the protective cover of the traditional terminal block has a relatively single function and cannot actively suppress fires when the terminal block overheats or short-circuits. Moreover, most of the existing fire extinguishing devices (such as gas fire extinguishing systems) in electrical cabinets are designed globally, and they cannot accurately extinguish local fires on the terminal block, with slow response speed and high cost.

[0045] The present utility model provides a fire extinguishing device and a power distribution cabinet, aiming to improve the extinguishing efficiency of the terminal block fire in the existing power distribution cabinet.

[0046] Please refer to Figure 1 and Figure 2 , in an embodiment of the present utility model, the fire extinguishing device 100 includes a box body 1, a cover body 2, and a fire extinguishing layer 3. The box body 1 is provided with a receiving groove 11 for receiving the terminal block 200; the cover body 2 is detachably connected to the box body 1 so that the cover body 2 can cover or expose the notch of the receiving groove 11; the fire extinguishing layer 3 is disposed on the side of the cover body 2 facing the receiving groove 11, and the fire extinguishing layer 3 is arranged to face the terminal block 200, and the fire extinguishing layer 3 can release fire extinguishing gas when the temperature of the terminal block 200 exceeds a preset temperature.

[0047] The technical solution of the present utility model places the terminal block 200 in the receiving groove 11 of the box body 1, and then covers the receiving groove 11 with the cover body 2, so that the fire extinguishing layer 3 faces the terminal block 200 located in the receiving groove 11. If the terminal block 200 overheats or is short-circuited, it will cause the surrounding environmental temperature to rise rapidly. When the temperature of the terminal block 200 rises to the preset temperature, the fire extinguishing layer 3 will generate fire extinguishing gas to extinguish the fire and cool down the terminal block 200 in the receiving groove 11, thereby quickly suppressing the fire source in the initial stage of overheating or short-circuit of the terminal block 200 and preventing the spread of the fire; Therefore, the cover body 2 of this embodiment can not only play the role of dust prevention and electric shock prevention, but also can quickly suppress the spread of the fire in the initial stage of overheating or short-circuit of the terminal block 200 due to the fire prevention layer provided on the side of the cover body 2 facing the receiving groove 11, eliminating the process of manually discovering the fire, fetching the fire extinguishing device 100 and then rushing to the fire point, saving time, improving the fire extinguishing efficiency, reducing the losses caused by the spread of the fire. Through simulation test data, the fire extinguishing device 100 of this embodiment can reduce the fire spread rate of the terminal block 200 by more than 90%; And compared with the traditional fire extinguishing device 100 in the electrical cabinet, the fire extinguishing agent consumption of the fire extinguishing device 100 of this application is only 1 / 50 of that of the traditional fire extinguishing device 100 in the electrical cabinet, reducing the environmental pollution; And because the fire extinguishing layer 3 is arranged on the inner side of the cover body 2 opposite to the terminal block 200, on the one hand, it realizes the precise fire extinguishing of the terminal block 200 without an external global fire extinguishing device in the power distribution cabinet; on the other hand, it realizes the shortest path of the fire extinguishing agent release, and can block the combustion within 10s - 30s after the arc is generated; And the fire extinguishing device 100 of this embodiment can be compatible with the existing structure of the terminal block 200, so there is no need to improve the wiring process of the existing terminal block 200. Among them, the cover body 2 is detachably connected to the box body 1, so as to facilitate the installation and replacement of the fire extinguishing layer 3. It should be noted that the cover body 2 can be provided with clamping posts 22, and the box body 1 can be provided with clamping grooves 12 that are clamped and matched with the clamping posts 22, so as to realize the clamping and matching of the cover body 2 and the box body 1; The cover body 2 can also be provided with sliding blocks, and the box body 1 is provided with sliding rails that are slidably matched with the sliding blocks, so as to realize the sliding cooperation between the box body 1 and the cover body 2. It should also be noted that the preset temperature is a preset temperature value, and this preset temperature is generally about 150°C.

[0048] Please refer to Figure 2 and Figure 4, in one embodiment, the fire extinguishing layer 3 includes a main body layer 31 and a barrier layer 32 covering the periphery of the main body layer 31. The side of the barrier layer 32 facing away from the receiving groove 11 is disposed on the side of the cover body 2 facing the receiving groove 11; the main body layer 31 includes an adhesive layer 311 and a plurality of fire extinguishing capsules 312 disposed on the adhesive layer 311. When the temperature of the terminal block 200 exceeds a preset temperature, the barrier layer 32 melts and the fire extinguishing capsules 312 release fire extinguishing gas. A plurality of fire extinguishing capsules 312 are adhered by an adhesive and then cured to form the main body layer 31. By applying a barrier material on the outer surface of the main body layer 31 and waiting for the material to cure, the barrier layer 32 is formed. The barrier layer 32 functions to waterproof, moisture-proof and anti-corrosion, effectively improving the lifespan of the fire extinguishing capsules 312 located therein. When the temperature of the terminal block 200 exceeds the preset temperature, the barrier layer 32 melts, and at the same time the fire extinguishing capsules 312 release fire extinguishing gas, so as to quickly suppress the spread of fire at the initial stage of overheating or short circuit of the terminal block 200. It should be noted that the adhesive can be realized by using an existing adhesive.

[0049] Please refer to Figure 2 , in one embodiment, the fire extinguishing layer 3 is provided in a sheet-like structure; wherein, the fire extinguishing layer 3 is provided in a sheet-like structure to facilitate the mounting of the fire extinguishing layer 3.

[0050] Please refer to Figure 1 , in one embodiment, the side of the barrier layer 32 facing away from the receiving groove 11 is attached to the side of the cover body 2 facing the receiving groove 11; the barrier layer 32 is attached to the cover body 2, reducing the volume of the cover body 2 equipped with the fire extinguishing layer 3, thereby facilitating the installation of the cover body 2.

[0051] In one embodiment, the fire extinguishing capsule 312 is a perfluoromethylcyclohexanone microcapsule; perfluoromethylcyclohexanone is a liquid at room temperature and has a relatively low boiling point, such as 49.2 °C. Its heat of vaporization is only 1 / 25 of that of water, and its heat of vaporization is 88.0 kJ / kg, making it extremely easy to vaporize. During fire extinguishing, the released perfluoromethylcyclohexanone quickly transforms from a liquid state to a gaseous state, absorbing a large amount of heat during the process, which can rapidly reduce the temperature of the fire source and the surrounding environment, bringing the temperature of the combustible material below the ignition point, thereby inhibiting the continuous progress of the combustion reaction; the gas layer formed after the perfluoromethylcyclohexanone is ejected has a relatively large density and can cover the surface of the combustible material, forming an isolation layer to prevent oxygen in the air from coming into contact with the combustible material, making the combustion unable to continue due to lack of oxygen. At the same time, the volume expansion after its vaporization can also form a relatively enclosed environment in the protection area, further reducing the oxygen concentration and reducing the content of the combustion-supporting agent in the three elements of fire, making it reach below the combustion concentration to complete the fire extinguishing function; free radicals are generated during its combustion process, maintaining the continuous progress of the combustion. The carbon atoms in the perfluoromethylcyclohexanone molecule have relatively high reactivity and can capture these free radicals and combine with them to form stable compounds, thereby blocking the progress of the combustion chain reaction and extinguishing the flame. In addition, when the temperature in the protection area rises, perfluoromethylcyclohexanone will undergo chemical cleavage, a part of the bonds in the fire extinguishing agent molecule will break, and further combine with the active free radicals generated during the flame combustion process to play a chemical inhibition fire extinguishing function. It should be noted that the fire extinguishing capsule 312 can also be a halogenated alkane microcapsule.

[0052] In one embodiment, the barrier layer 32 is a modified polyurethane barrier layer; by using the modified polyurethane barrier layer to protect the fire extinguishing capsule 312 located therein, it can play the roles of waterproofing, moisture-proofing and anti-corrosion, and extend the service life of the fire extinguishing capsule 312. In addition, the barrier layer 32 can also be a polyimide film layer, or a polyethylene film layer, or a polypropylene film layer, and no specific limitation is made here.

[0053] Please refer to Figure 2 and Figure 4 In one embodiment, the thickness of the fire extinguishing layer 3 is h1, where 0.5 mm ≤ h1 ≤ 2.5 mm; by controlling the thickness of the fire extinguishing layer 3, the probability of interference between the fire extinguishing layer 3 and the terminal block 200 can be reduced, so that it can adapt to terminal blocks 200 of different heights.

[0054] Please refer to Figure 4 In one embodiment, the diameter of each fire extinguishing capsule 312 is d, where 50 μm ≤ d ≤ 1500 μm.

[0055] Please refer to Figure 5, in one embodiment, the fire extinguishing layer 3 includes a fire extinguishing coating layer 33. The fire extinguishing coating layer 33 includes a composite thermosensitive substrate layer (not shown in the figure) and fire extinguishing capsules 312. The number of the fire extinguishing capsules 312 is multiple. The multiple fire extinguishing capsules 312 are arranged on the composite thermosensitive substrate layer. The composite thermosensitive substrate layer is arranged on the side of the cover body 2 facing the receiving groove 11. The composite thermosensitive substrate layer can be vaporized when the ambient temperature reaches the release temperature and shoot the fire extinguishing capsules 312 towards the terminal block 200. The fire extinguishing capsules 312 can release fire extinguishing gas when the temperature of the terminal block 200 exceeds the preset temperature. After the composite thermosensitive substrate layer reaches the release temperature, it will vaporize and expand, and the expanded gas will shoot the fire extinguishing capsules 312 towards the terminal block 200. After the fire extinguishing capsules 312 are heated, they release fire extinguishing gas, so as to quickly suppress the spread of fire in the initial stage of overheating or short circuit of the terminal block 200. It should be noted that the composite thermosensitive substrate layer can be a potassium nitrate substrate layer. The endothermic decomposition process (endothermic reaction) of potassium nitrate can locally reduce the flame temperature and assist in fire extinguishing; potassium ions (K + ) form active substances (such as KOH or K2CO3) at high temperature to inhibit the combustion chain reaction; as an oxidant, potassium nitrate reacts with reducing components (such as sulfur or carbon), and the gas generated by high-temperature decomposition expands, spraying the fire extinguishing particles (perfluorohexanone microcapsules) out of the device to ensure the efficient diffusion of the fire extinguishing agent.

[0056] Please refer to Figure 5 , in one embodiment, the fire extinguishing layer 3 further includes a heat conducting layer 34. One side of the heat conducting layer 34 is attached to the cover body 2, and the other side of the heat conducting layer 34 is attached to the composite thermosensitive substrate layer; alternatively, the number of the heat conducting layers 34 is multiple, and the multiple heat conducting layers 34 are embedded in the composite thermosensitive substrate layer. By setting the heat conducting layer 34, heat can be transferred to the composite thermosensitive substrate layer faster, accelerating the vaporization of the composite thermosensitive substrate layer and the release of fire extinguishing gas by the fire extinguishing capsules 312, thereby improving the fire extinguishing efficiency. The heat conducting layer 34 can be a carbon nanotube heat conducting layer 34, or a heat conducting copper layer or a heat conducting aluminum layer.

[0057] According to an embodiment of the present invention, a fire extinguishing coating can be made by mixing a thermosensitive resin and perfluorohexanone powder, adding a carbon nanotube heat conducting agent to the coating to form a composite fire extinguishing coating, and then brushing it onto the cover body 2 to form the fire extinguishing coating layer 33. By adding a carbon nanotube heat conducting agent to the coating, heat transfer to the coating layer can be accelerated, triggering the vaporization and release of perfluorohexanone, and improving the fire extinguishing efficiency.

[0058] Please refer to Figure 5 , in one embodiment, the thickness of the fire extinguishing coating layer 33 is h2, and 0.2 mm ≤ h2 ≤ 1 mm; controlling the thickness of the fire extinguishing coating layer 33 between 0.2 mm and 1 mm reserves sufficient installation space for the terminal block 200.

[0059] In one embodiment, the diameter of each fire extinguishing capsule 312 is d, where 50 μm ≤ d ≤ 500 μm.

[0060] In one embodiment, the fire extinguishing capsule 312 is a perfluoromethylcyclohexanone microcapsule; wherein, perfluoromethylcyclohexanone is a liquid at room temperature and has a relatively low boiling point, such as 49.2 °C. Its heat of vaporization is only 1 / 25 of that of water, and its heat of vaporization is 88.0 kJ / kg, making it extremely easy to vaporize. During fire extinguishing, the released perfluoromethylcyclohexanone quickly changes from a liquid state to a gaseous state, absorbing a large amount of heat during the process, which can rapidly reduce the temperature of the fire source and the surrounding environment, bringing the temperature of the combustible material below the ignition point, thereby inhibiting the continuous progress of the combustion reaction.

[0061] In one embodiment, the composite thermosensitive base material layer is attached to the side of the cover body 2 facing the receiving groove 11. The composite thermosensitive base material layer is attached to the side of the cover body 2 facing the terminal block 200, thereby making the connection between the composite thermosensitive base material layer and the cover body 2 tighter and improving the reliability of the connection.

[0062] Please refer to Figure 6 , in one embodiment, the fire extinguishing device 100 further includes a heating element 4 and a temperature detection element 5. The detection end of the temperature detection element 5 is arranged to face the terminal block 200. The temperature detection element 5 is electrically connected to the heating element 4, so that when the temperature detection element 5 detects that the temperature of the terminal block 200 is higher than the operating temperature, the heating element 4 heats the fire extinguishing layer 3. The temperature detection element 5 is used to detect whether the temperature of the terminal block 200 is higher than the preset temperature. If it is higher than the preset temperature, it controls the heating element 4 to heat the fire extinguishing layer 3, thereby accelerating the release of the fire extinguishing gas. Compared with the situation where the heat generated by the terminal block 200 causes the ambient temperature to rise and then the fire extinguishing layer 3 releases the fire extinguishing gas through the rise of the ambient temperature, the efficiency is higher. In this embodiment, the heating element 4 directly conducts contact heating on the fire extinguishing layer 3, and the heat is directly transferred to the fire extinguishing layer 3, which is faster than the heat being transmitted to the fire extinguishing layer 3 through the medium of air. Therefore, the fire extinguishing efficiency is higher, and thus the spread of the fire can be better controlled. It should be noted that the temperature detection element 5 includes a switch and a temperature detection unit. The power supply, the switch, and the heating element 4 are connected in series, and the temperature detection unit is electrically connected to the switch. When the temperature of the terminal block 200 is higher than the preset temperature, the temperature detection unit controls the switch to close, and the heating element 4 generates heat; wherein the heating element 4 can be a resistance wire or a heating wire, etc.

[0063] In one embodiment, the cover body 2 is a transparent cover body; by setting the cover body 2 as a transparent cover body, it is convenient for the inspection personnel to directly see the situation inside the box body 1 without disassembling the cover body 2, thus not affecting the daily inspection and the identification of the line markings. It should be noted that the fire extinguishing layer 3 does not cover the entire surface of the cover body 2. The fire extinguishing layer 3 covers a partial area of the cover body 2, and the remaining partial area is for the operator to conduct inspection and observation.

[0064] In one embodiment, the cover body 2 is a flame-retardant cover body. The cover body 2 being a flame-retardant cover body thus cooperates with the fire extinguishing layer 3 to achieve multi-level fire prevention and improve safety.

[0065] Please refer to Figure 3 , in one embodiment, an installation groove 21 is provided on the side of the cover body 2 facing the accommodation groove 11, and the fire extinguishing layer 3 is arranged in the installation groove 21. By providing the installation groove 21 for accommodating the fire extinguishing layer 3 on the cover body 2, the fire extinguishing layer 3 does not occupy the space of the accommodation groove 11, thereby reserving sufficient installation space for the installation of the terminal block 200.

[0066] The present utility model also proposes a power distribution cabinet, which includes a terminal block 200 and the above-mentioned fire extinguishing device 100. The specific structure of the fire extinguishing device 100 refers to the above-mentioned embodiments. Since the power distribution cabinet adopts all the technical solutions of the above-mentioned all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated one by one here.

[0067] The above is only an exemplary embodiment of the present utility model, and does not limit the protection scope of the present utility model accordingly. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included in the protection scope of the present utility model.

Claims

1. A fire extinguishing device, characterized in that: include: A box body, wherein the box body is provided with a receiving groove, and the receiving groove is used to receive the terminal block; A cover body, the cover body is detachably connected to the box body so that the cover body can cover or expose the notch of the receiving groove; A fire extinguishing layer is arranged on a side of the cover body facing the receiving groove, the fire extinguishing layer is used to be arranged toward the terminal block, and the fire extinguishing layer can release fire extinguishing gas when the temperature of the terminal block exceeds a preset temperature.

2. The fire extinguishing device according to claim 1, characterized in that: The fire extinguishing layer includes a main body layer and a barrier layer covering the periphery of the main body layer, wherein the side of the barrier layer facing away from the receiving groove is arranged on the side of the cover body facing the receiving groove; the main body layer includes an adhesive layer and a plurality of fire extinguishing capsules arranged on the adhesive layer; when the temperature of the terminal row exceeds the preset temperature, the barrier layer melts and the fire extinguishing capsules release fire extinguishing gas.

3. The fire extinguishing device according to claim 2, characterized in that: The fire extinguishing layer is arranged in a sheet-like structure; And / or, a side of the barrier layer facing away from the receiving groove is attached to a side of the cover body facing the receiving groove; And / or, the fire extinguishing capsule is a perfluorohexanone microcapsule; And / or, the barrier layer is a modified polyurethane barrier layer; And / or, the thickness of the fire extinguishing layer is h1, 0.5mm≤h1≤2.5mm; And / or, the diameter of each fire extinguishing capsule is d, 50 μm≤d≤1500 μm.

4. The fire extinguishing device according to claim 1, characterized in that: The fire extinguishing layer includes a fire extinguishing coating layer, and the fire extinguishing coating layer includes a composite heat-sensitive substrate layer and a fire extinguishing capsule. The number of the fire extinguishing capsules is multiple, and the multiple fire extinguishing capsules are arranged on the composite heat-sensitive substrate layer. The composite heat-sensitive substrate layer is arranged on the side of the cover body facing the accommodating groove. The composite heat-sensitive substrate layer can vaporize when the ambient temperature reaches the release temperature and eject the fire extinguishing capsules toward the terminal row. The fire extinguishing capsules can release fire extinguishing gas when the temperature of the terminal row exceeds the preset temperature.

5. The fire extinguishing device according to claim 4, characterized in that: The fire extinguishing layer also includes a heat conducting layer, One side of the heat-conducting layer is bonded to the cover body, and the other side of the heat-conducting layer is bonded to the composite heat-sensitive substrate layer; Alternatively, there are multiple heat-conducting layers, and the multiple heat-conducting layers are embedded in the composite heat-sensitive substrate layer.

6. The fire extinguishing device according to claim 4, characterized in that: The thickness of the fire extinguishing coating layer is h2, 0.2mm≤h2≤1mm; and / or, the diameter of each of the fire extinguishing capsules is d, 50 μm≤d≤500 μm; And / or, the fire extinguishing capsule is a perfluorohexanone microcapsule; And / or, the composite heat-sensitive substrate layer is attached to a side of the cover body facing the receiving groove.

7. The fire extinguishing device according to any one of claims 1 to 6, characterized in that: The fire extinguishing device also includes a heating element and a temperature detection element. The detection end of the temperature detection element is used to be set toward the terminal row. The temperature detection element is electrically connected to the heating element so that when the temperature detection element detects that the temperature of the terminal row is higher than the preset temperature, the heating element heats the fire extinguishing layer.

8. The fire extinguishing device according to any one of claims 1 to 6, characterized in that: The cover is a transparent cover; And / or, the cover body is a flame retardant cover body.

9. The fire extinguishing device according to any one of claims 1 to 6, characterized in that: A mounting groove is arranged on one side of the cover body facing the accommodating groove, and the fire extinguishing layer is arranged in the mounting groove.

10. A power distribution cabinet, characterized in that: The power distribution cabinet comprises a terminal block and a fire extinguishing device as claimed in any one of claims 1 to 9.

Images