A multi-module combined splicing distribution box

Abstract

The application relates to the technical field of distribution boxes, and discloses a multi-module combined splicing distribution box which comprises a base, a main box body and two auxiliary box bodies. The main box body is fixed to the top of the base, and the shapes of the main box body and the auxiliary box bodies are both U-shaped. The two auxiliary box bodies are symmetrically arranged on the two sides of the main box body and can horizontally slide along the inner side walls of the main box body to realize the splicing combination and capacity adjustment of the multi-modules. A pressure relief guiding structure is arranged between the main box body and the auxiliary box bodies and is used for guiding the internal explosion impact to be directed out along a preset path. The application has the multiple safety protection functions of modularization, quick disassembly and assembly, internal explosion buffering, guiding, pressure relief, fragment blocking, explosion linkage, closed ventilation slots forming anaerobic fire extinguishing, and an automatic fire extinguishing device which is adaptively opened and sized according to the explosion stroke and is cyclically utilized.

Description

Technical Field

[0001] This invention relates to the field of distribution box technology, specifically to a multi-module modular splicing distribution box. Background Technology

[0002] As a core terminal device in power systems, distribution boxes are widely used in various complex indoor and outdoor scenarios. During long-term service, especially in environments such as roadside bushes and outdoor green belts, in addition to common electrical faults, they are also susceptible to external impacts, poor heat dissipation, and rainwater erosion. This can lead to the generation of high-temperature electric arcs and flammable gases inside, causing a rapid increase in pressure and potentially resulting in an explosion. Such accidents not only damage the equipment but may also affect surrounding personnel, vegetation, and public facilities. Therefore, the explosion-proof pressure relief design of distribution boxes is a key technical challenge in this field.

[0003] To address the aforementioned issues, Chinese invention patent CN116544810B discloses a modular distribution box that divides the box into a top box, a middle box, and a bottom box, and uses a telescopic sleeve to separate the box and buffer pressure relief when the internal air pressure is too high. However, this solution still has the following shortcomings in practical applications:

[0004] Firstly, the pressure relief response is slow. This solution relies on the separation of the housing and the passive bulging of the telescopic sleeve to achieve pressure relief. The bulging of the telescopic sleeve is a passive deformation when the air pressure rises, which is used to buffer the impact and compensate for the displacement of the housing separation. However, when a sudden high-pressure impact or multiple explosions occur inside the housing, the internal air pressure will continue to rise sharply. The response speed of housing separation and telescopic sleeve deformation cannot match the speed of the generation of instantaneous high pressure. The bulging of the telescopic sleeve will continue to intensify. When the pressure it bears exceeds its material limit, it will rupture. It is difficult to achieve high pressure relief quickly, and there is still a hidden explosion-related hazard.

[0005] Secondly, the depressurization direction is uncontrollable. High-pressure gas, accompanied by flames and smoke, is ejected from the gaps around the box or from irregular ruptures, making it impossible to achieve directional discharge. In outdoor scenarios, this can easily ignite surrounding vegetation.

[0006] Third, the risk of secondary hazards is high. The irregular pressure relief direction poses a threat to operators, adjacent equipment and passersby, which limits its promotion and application in complex outdoor environments.

[0007] Therefore, a distribution box that can achieve rapid directional pressure relief and good fire extinguishing effect is needed to solve the above problems. Summary of the Invention

[0008] To solve the above-mentioned technical problems, the technical solution of the present invention is: a multi-module modular splicing distribution box, including a base, a main box, and two auxiliary boxes; the main box is fixed to the top of the base, and both the main box and the auxiliary boxes are U-shaped; the two auxiliary boxes are symmetrically arranged on both sides of the main box, and the two can slide horizontally along the inner sidewall of the main box to realize the splicing and combination of multiple modules and capacity adjustment; a pressure relief guide structure is provided between the main box and the auxiliary boxes to direct the internal explosion impact along a preset path.

[0009] Furthermore, the top and bottom of the sub-box are provided with sliding grooves, and the sliding grooves are slidably fitted with pin sliders. The front end of the pin slider is provided with a limiting block, and the limiting block is engaged with the main box. Adjacent pin sliders are symmetrically connected to one end of an elastic element on opposite sides, and the other end of the elastic element is connected to the main box. The top and bottom surfaces of the sub-box are provided with multiple hollow grooves at equal intervals, and the hollow grooves are in sliding contact with the elastic elements.

[0010] Furthermore, the groove surface of the sub-box is equipped with a rotating door and a back panel. The two rotating doors are locked together by a connecting structure. The connecting structure includes a rotating bolt lock on one of the rotating doors and a sliding hole on the other rotating door. The rotating bolt lock and the sliding hole are slidably engaged.

[0011] Furthermore, the inner wall of the main housing is symmetrically and equidistantly connected with multiple baffles, and the back panel is provided with several horizontally arranged stabilizing grooves. The baffles are limited to move within the stabilizing grooves to form a debris blocking barrier. An automatic fire extinguishing device is installed on the inner wall of the main housing.

[0012] Furthermore, the symmetrically arranged secondary housings have multiple perforated ventilation slots equidistantly opened on their opposite sides. The ventilation slots are rotatably connected to louvers. The multiple louvers are connected to two symmetrically arranged connecting rods. The connecting rods are L-shaped, and the horizontal ends of the connecting rods are locked in the limiting slots opened on the top of the secondary housings.

[0013] Furthermore, the automatic fire extinguishing device includes a base plate, a fire extinguisher, a linkage rod, a linear guide rod, a support rod, a telescopic rod, a rotating cover, a reset torsion spring, and a rubber sleeve. One side of the base plate is connected to the inner wall of the main housing. The fire extinguisher is installed on the top of the base plate. The bottom of the rotating cover is connected to one end of the reset torsion spring, and the other end of the reset torsion spring is connected to the fire extinguisher. The outer ring of the output end of the fire extinguisher is rotatably connected to the rotating cover. The outer ring of the rotating cover is symmetrically connected to one end of the telescopic rod. The other end of the telescopic rod is rotatably connected to one end of the linear guide rod. The other end of the linear guide rod is in contact with one end of the linkage rod. The other ends of the two linkage rods are respectively connected to the auxiliary housing.

[0014] Furthermore, a rubber sleeve is fitted around the output end of the fire extinguisher, and a rotating cover is fitted around the outer ring of the rubber sleeve.

[0015] Furthermore, both the linear guide rod and the linkage rod are slidably engaged with a support rod, which is mounted on the surface of the base plate.

[0016] Furthermore, rubber buffer pads are installed on the opposite surfaces of the adjacent pin sliders, and the rubber buffer pads are used to buffer the opposite surfaces of the pin sliders after the elastic element releases its force.

[0017] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0018] (1) The present invention uses a sliding fit structure of U-shaped main box and symmetrical U-shaped secondary box, combined with the synergistic effect of plug slider, limit block, elastic element and hollow groove, to achieve the blocking and guiding of impact force, elastic buffer and directional pressure relief along the hollow groove when instantaneous high pressure impact or explosion occurs inside the distribution box, so as to avoid box collapse, fragment splashing and irregular spraying of high temperature smoke, effectively avoid injury to surrounding personnel and suppress the irregular spread of danger;

[0019] (2) The automatic fire extinguishing device built into the main housing is directly coupled to the sliding stroke of the auxiliary housing through a linkage rod, linear guide rod, and telescopic rod. It adaptively activates the fire extinguisher at the moment of the explosion and automatically adjusts the amount of extinguishing medium sprayed according to the intensity of the explosion to match the extinguishing dosage with the size of the fire. At the same time, the louvers and connecting rods on the back of the auxiliary housing automatically close the ventilation slots under the impact force to cut off the oxygen supply, forming a dual suppression mechanism of active fire extinguishing and passive asphyxiation. After the fire is extinguished, the elastic element and the rubber sleeve cooperate to realize the slow closing of the rotating cover and the self-resetting of the fire extinguishing device, which has the ability to be recycled and reduces maintenance costs.

[0020] (3) The base, main housing, and auxiliary housing are all made of polycarbonate, which has the characteristics of being lightweight, high-strength, insulating, self-extinguishing, and corrosion-resistant, and requires no additional grounding treatment. The modules are connected by sliding plugs and elastic locking to achieve tool-free quick assembly and disassembly, improving on-site deployment efficiency. The baffle inside the main housing and the back panel of the auxiliary housing slide together to form a physical barrier to prevent the flying of fragments caused by the explosion of electrical components; the rubber buffer pads between adjacent plug sliders further absorb the collision energy, reducing structural damage and noise, and enhancing the impact resistance and personnel protection capabilities while meeting the requirements of flexible combination. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is an exploded view of the present invention;

[0023] Figure 3This is a schematic diagram of the structure of the louvered panel of the present invention;

[0024] Figure 4 This is a schematic diagram of the automatic fire extinguishing device in this invention;

[0025] Figure 5 for Figure 1 Enlarged view of point A in the middle.

[0026] In the diagram: 1-base, 2-main body, 21-partition plate, 3-sub-body, 31-back panel, 32-hollow groove, 33-ventilation groove, 34-louvered plate, 35-connecting rod, 36-slide groove, 4-rotating door, 41-rotating bolt lock, 5-bolt slider, 51-rubber buffer pad, 6-limiting block, 7-elastic element, 8-automatic fire extinguishing device, 81-base plate, 82-fire extinguisher, 83-linkage rod, 84-linear guide rod, 85-support rod, 86-telescopic rod, 87-rotating cover, 88-reset torsion spring, 89-rubber sleeve. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0028] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "comprising" or "including," and similar terms used in this disclosure, mean that an element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0029] like Figures 1 to 5As shown, a multi-module modular distribution box is constructed, consisting of a base 1, a main enclosure 2, and a secondary enclosure 3. These components work together to achieve stable assembly and safety protection. The specific structure is as follows: The top of the base 1 is firmly connected to the bottom of the U-shaped main enclosure 2, providing stable support for the overall structure. The U-shaped groove of the main enclosure 2 and the symmetrically arranged ends of the U-shaped secondary enclosure 3 form a precise sliding fit, allowing for flexible assembly and disassembly of the secondary enclosure 3, making assembly convenient and efficient. The top and bottom of the secondary enclosure 3 are symmetrically provided with sliding grooves 36, which smoothly slide against the pin slider 5. The front end of the pin slider 5 is equipped with a limiting stop 6, which can precisely engage with the main enclosure 2, achieving rapid locking between the secondary enclosure 3 and the main enclosure 2 and ensuring the structural stability after assembly. The opposite sides of adjacent pin sliders 5 are connected to one end of symmetrically arranged elastic elements 7, and the other end of elastic elements 7 is fixedly connected to the main housing 2. At the same time, multiple hollow grooves 32 are equidistantly opened on the top and bottom surfaces of the auxiliary housing 3. The elastic elements 7 slide in contact with the hollow grooves 32, which not only provides radial limit for the elastic elements 7 to prevent them from shifting under force, but also does not affect the sliding adjustment of the auxiliary housing 3. An automatic fire extinguishing device 8 is installed on the inner wall of the main housing 2, which can respond quickly in the event of a sudden fire. Rubber buffer pads 51 are installed on the opposite sides of adjacent pin sliders 5, which can effectively buffer the rigid collision of the pin sliders 5 during movement and reduce component wear and noise.

[0030] The U-shaped sub-box 3 has symmetrically installed rotating doors 4 and back panels 31 in its groove. One of the rotating doors 4 is equipped with a rotating bolt lock 41, which slides with the sliding hole of the other rotating door 4 to achieve tight closing and locking of the rotating door 4. This protects the electrical components inside the box and facilitates later maintenance operations.

[0031] The inner wall of the U-shaped main housing 2 is symmetrically connected with multiple baffles 21 at equal intervals. The baffles 21 slide in the stabilizing grooves of the back cover 31, which not only enhances the overall rigidity of the main housing 2 and the secondary housing 3 after splicing, but also forms a zoned protection, effectively blocking the flying of fragments when electrical components fail.

[0032] Multiple perforated ventilation slots 33 are equidistantly provided on the opposite sides of the two auxiliary boxes 3. The ventilation slots 33 are rotatably connected to the louvers 34. The multiple louvers 34 are linked to two symmetrically arranged L-shaped connecting rods 35. The horizontal end of the connecting rod 35 is locked in the limiting slot 37 opened on the top of the auxiliary box 3, which can realize the synchronous adjustment of the louvers 34. This can not only meet the daily ventilation and heat dissipation needs of the box, but also quickly close in case of emergency, ensuring safe use.

[0033] The automatic fire extinguishing device 8 consists of a base plate 81, a fire extinguisher 82, a linkage rod 83, a linear guide rod 84, a support rod 85, a telescopic rod 86, a rotating cover 87, a reset torsion spring 88, and a rubber sleeve 89. The components work together to achieve automatic triggering and extinguishing of fire. One side of the base plate 81 is firmly connected to the inner wall of the main housing 2, providing a stable installation foundation for the entire fire extinguishing device. A fire extinguisher 82 is installed on the top of the base plate 81. The bottom of the rotating cover 87 is connected to one end of the return torsion spring 88, and the other end of the return torsion spring 88 is connected to the fire extinguisher 82. The outer ring of the output end of the fire extinguisher 82 is rotated and engaged with the rotating cover 87. Under normal conditions, the rotating cover 87 can tightly seal the output end of the fire extinguisher 82, ensuring the airtightness of the fire extinguisher 82. A telescopic rod 86 is symmetrically connected to the outer ring of the rotating cover 87. The other end of the telescopic rod 86 is rotatably connected to one end of the linear guide rod 84. The other end of the linear guide rod 84 is precisely in contact with one end of the linkage rod 83. The other ends of the two linkage rods 83 are respectively connected to the two auxiliary housings 3, which can realize the linkage triggering of the movement of the auxiliary housings 3 and the fire extinguishing device.

[0034] The output end of the fire extinguisher 82 is fitted with a rubber sleeve 89, and a rotating cover 87 is fitted around the outer ring of the rubber sleeve 89. This not only enhances the sealing effect between the rotating cover 87 and the output end of the fire extinguisher 82, but also acts as a buffer when the rotating cover 87 is opened and closed, thus preventing wear on the parts.

[0035] Both the linear guide rod 84 and the linkage rod 83 are slidably engaged with the same support rod 85. The support rod 85 is securely installed on the surface of the base plate 81, providing precise guidance for the movement of the linear guide rod 84 and the linkage rod 83, ensuring the smoothness and reliability of the linkage triggering, and guaranteeing the rapid response of the automatic fire extinguishing device 8.

[0036] Working principle and usage process of this invention:

[0037] The base 1, main enclosure 2, and two symmetrically arranged U-shaped auxiliary enclosures 3 of this distribution box are all made of polycarbonate. Polycarbonate has comprehensive advantages such as being lightweight and high-strength, having excellent insulation, being self-extinguishing and flame-retardant, corrosion-resistant, and easy to mold. Compared with traditional metal enclosures, it does not require grounding and has lower production costs. During module installation, the two auxiliary enclosures 3 are directly slid into the U-shaped grooves of the main enclosure 2 from the left and right sides, respectively. Assembly can be completed without any tools, making the operation simple and quick, greatly reducing the difficulty and time cost of on-site installation. After the auxiliary enclosures 3 slide into place, the pin sliders 5 in their top and bottom grooves automatically slide outward under the elastic force of the elastic element 7, so that the limit stop 6 at the front end of the pin slider 5 automatically engages with the corresponding position of the main enclosure 2, thereby achieving quick locking between the auxiliary enclosures 3 and the main enclosure 2. When disassembly is required, simply push the pin slider 5 inward against the elastic force of the elastic element 7 to disengage the limit stop 6, and the auxiliary enclosure 3 can be pulled out. The disassembly and assembly process is equally simple. At this time, the elastic element 7 is located within the hollowed-out grooves 32 on the top and bottom surfaces of the sub-box 3. The groove walls 32 radially limit the elastic element 7, ensuring that it can only undergo linear deformation along the axial direction when subjected to force, preventing bending, twisting, or displacement. Rubber buffer pads 51 are installed on the opposing surfaces of adjacent pin sliders 5, which can buffer and dampen vibrations during relative movement of the pin sliders 5, avoiding noise and damage caused by rigid collisions. The entire modular design allows the distribution box to be combined according to actual needs, quickly assembled on-site, and put into use.

[0038] When a short circuit, arc discharge, or explosion occurs inside the distribution box due to an electrical fault, a momentary high-voltage impact is generated. This momentary high-voltage impact first acts on the inner wall of the auxiliary enclosure 3, causing it to tend to slide outwards. The limiting block 6 at the front end of the pin slider 5 remains engaged with the main enclosure 2, blocking the sliding tendency of the auxiliary enclosure 3. This blocking action guides the direction of the impact force, transforming it from a direct outward impact into a guiding force along the direction of the sliding groove 36. Under this guiding action, the impact force is transmitted to the pin slider 5, which in turn compresses the elastic element 7 located in the hollow groove 32. The hollow groove 32, as the inlet of the pressure relief channel, receives the impact energy after being guided by the blocking action. The elastic element 7 undergoes compression deformation under the momentary high-voltage impact, converting some of the impact kinetic energy into elastic potential energy, thus buffering and absorbing energy. Simultaneously, the hollow groove 32, as a pressure relief channel, guides the residual impact pressure along the groove direction to the outside of the enclosure, preventing pressure accumulation inside the enclosure and causing secondary damage. After the process, the rubber buffer pads 51 on the opposite sides of the pin sliders 5 absorb the mutual impact energy between the pin sliders 5, further reducing impact damage. After the impact, the elastic element 7 releases its elastic potential energy and returns to its original state, pushing the pin sliders 5 and the secondary housing 3 back to their original positions. The limit block 6 then re-locks with the main housing 2, and the housing returns to its initial locked state. This buffer and pressure relief mechanism can prevent the housing from cracking, structural failure, or debris splashing due to internal explosions. Through the design of the blocking guide and the discharge path of the hollow groove 32, the impact energy is released in an orderly manner.

[0039] The bottom surface of the U-shaped groove of the main housing 2 is symmetrically connected with multiple baffles 21 at equal intervals. The baffles 21 slide in conjunction with the stabilizing grooves of the back cover 31. When an electrical component in a certain installation area explodes, the baffles 21 act as a physical barrier, directly preventing the debris generated by the explosion from flying out towards the secondary housing area. Together with the back cover 31, they prevent debris from flying out of the stabilizing grooves of the secondary housing and injuring people, further enhancing the overall integrity and impact resistance of the structure.

[0040] Multiple ventilation slots 33 on the back of the sub-box 3 phase form ventilation channels in conjunction with louvers 34. The louvers 34 are connected to L-shaped connecting rods 35, the horizontal end of which is engaged in a limiting slot 37 on the top of the sub-box 3. Under normal use, the connecting rods 35 can be moved to rotate the multiple louvers 34 synchronously, adjusting the ventilation direction or opening and closing the vents to meet daily heat dissipation needs. When an explosion occurs inside the distribution box, the instantaneous impact force is transmitted through the inner wall of the sub-box 3 to the connecting rods 35. Under the impact force, the horizontal end of the connecting rods 35 overcomes the constraint of the limiting slots 37 and detaches from them. After detachment, the connecting rods 35 lose their positioning and, under the influence of gravity or the aftershock of the impact, rotate the louvers 34 to the closed position, completely sealing the ventilation slots 33. With the ventilation slots 33 closed, airflow between the inside of the box and the external environment is cut off. As the internal oxygen is consumed by the fire and no fresh air is replenished, an anaerobic environment gradually forms inside the chamber. The flames, lacking oxygen, cannot continue to burn, thus achieving self-suppression of the fire. This mechanism works in conjunction with the automatic fire extinguishing device 8: the automatic fire extinguishing device 8 actively sprays extinguishing agents, while the ventilation duct 33's closing mechanism passively cuts off the oxygen supply, thus doubly suppressing the spread of the fire. After the explosion, if ventilation needs to be restored, the operator can re-engage the horizontal end of the connecting rod 35 into the limiting groove 37, and the louvers 34 will restore the ventilation duct 33 to the required opening.

[0041] The automatic fire extinguishing device 8 includes a base plate 81, a fire extinguisher 82, a linkage rod 83, a linear guide rod 84, a support rod 85, a telescopic rod 86, a rotating cover 87, a return torsion spring 88, and a rubber sleeve 89. One side of the base plate 81 is connected to the inner wall of the main housing 2, and the fire extinguisher 82 is installed on the top of the base plate 81. In normal use, the output end of the fire extinguisher 82 is closed by the rotating cover 87, and the return torsion spring 88 is in a charged state. The rotating cover 87 is connected to the linear guide rod 84 via the telescopic rod 86. The end of the linear guide rod 84 is in contact with one end of the linkage rod 83, while the other ends of the two linkage rods 83 are fixedly connected to the left and right auxiliary housings 3, respectively. Both the linear guide rod 84 and the linkage rod 83 are slidably engaged with a support rod 85, which is mounted on the surface of the base plate 81, providing stable sliding guidance for the linear guide rod 84 and the linkage rod 83.

[0042] When an explosion occurs inside the distribution box, the instantaneous high-voltage impact directly acts on the auxiliary box 3, causing it to slide outward along the groove of the main box 2. This sliding of the auxiliary box 3 drives the linkage rod 83, which is fixedly connected to it, to move synchronously. The linkage rod 83 slides along the support rod 85 and pushes the linear guide rod 84. Under this force, the linear guide rod 84 drives the telescopic rod 86, which transmits the thrust to the rotating cover 87, overcoming the torque of the return torsion spring 88. This causes the rotating cover 87 to rotate and open relative to the output end of the fire extinguisher 82, allowing the extinguishing medium inside the fire extinguisher 82 to spray out from the output end, automatically extinguishing the fire inside the distribution box. Simultaneously, the self-extinguishing and flame-retardant properties of the polycarbonate material inhibit the spread of combustion within the box itself and prevent dripping at high temperatures, thus avoiding ignition of surrounding equipment.

[0043] During the opening of the rotating cover 87, the rubber sleeve 89, fitted between the outer ring of the output end of the fire extinguisher 82 and the rotating cover 87, is rapidly compressed and deformed. Because the compression resistance of the rubber sleeve 89 is much less than the explosive impact force, the rotating cover 87 opens rapidly with the movement of the auxiliary housing 3, rather than with a delay. The sliding stroke of the auxiliary housing 3 is positively correlated with the intensity of the explosion: the more violent the explosion, the greater the sliding stroke of the auxiliary housing 3, the wider the opening of the rotating cover 87, and the more extinguishing medium is sprayed from the fire extinguisher 82, with a longer spraying time; conversely, the smaller the explosion, the smaller the sliding stroke of the auxiliary housing 3, the smaller the opening of the rotating cover 87, and the less extinguishing medium is sprayed, with a shorter spraying time. This design achieves adaptive matching between the extinguishing agent dosage and the fire size, avoiding the waste of large amounts of extinguishing medium due to minor malfunctions.

[0044] After the fire is extinguished, the auxiliary housing 3 gradually returns to its original position under the restoring force of the elastic element 7. The linkage rod 83 and linear guide rod 84 then return to their original positions, and the opening force applied to the rotating cover 87 gradually decreases. At this time, the rubber sleeve 89 begins to slowly release its stored elastic potential energy, pushing the rotating cover 87 to rotate slowly. Simultaneously, the torque of the return torsion spring 88 assists in closing the rotating cover 87. The damping characteristics of the rubber sleeve 89 ensure a slow closing process, preventing the rotating cover 87 from suddenly impacting the output end of the fire extinguisher 82 and causing damage. After the rotating cover 87 is completely closed, it reseals the output end of the fire extinguisher 82, and the extinguishing medium stops spraying. Due to the elastic buffering effect of the rubber sleeve 89, the rotating cover 87 and the linkage mechanism are not damaged by impact during the entire closing process. The automatic fire extinguishing device 8 returns to standby mode and can be put back into use, achieving recycling. This design realizes an adaptive fire extinguishing mechanism of rapid opening and slow closing, significantly reducing maintenance costs.

[0045] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A multi-module modular assembly distribution box, characterized in that: It includes a base (1), a main housing (2) and two auxiliary housings (3); the main housing (2) is fixed to the top of the base (1), and both the main housing (2) and the auxiliary housings (3) are U-shaped; the two auxiliary housings (3) are symmetrically arranged on both sides of the main housing (2), and the two can slide horizontally along the inner sidewall of the main housing (2) to realize the splicing and combination of multiple modules and capacity adjustment; a pressure relief guide structure is provided between the main housing (2) and the auxiliary housings (3) to direct the internal explosion impact along a preset path.

2. The multi-module modular splicing distribution box according to claim 1, characterized in that: The sub-box (3) has sliding grooves (36) at the top and bottom. The sliding grooves (36) are slidably fitted with pin sliders (5). The pin sliders (5) have a limiting block (6) at the front end. The limiting block (6) is engaged with the main box (2). The adjacent pin sliders (5) are symmetrically connected to one end of an elastic element (7) on opposite sides. The other end of the elastic element (7) is connected to the main box (2). The top and bottom surfaces of the sub-box (3) have multiple hollowed-out grooves (32) at equal intervals. The hollowed-out grooves (32) are in sliding contact with the elastic element (7).

3. The multi-module modular splicing distribution box according to claim 1, characterized in that: The groove surface of the sub-box (3) is equipped with a rotating door (4) and a back panel (31). The two rotating doors (4) are locked together by a connecting structure. The connecting structure includes a rotating pin lock (41) set on one of the rotating doors (4) and a sliding hole opened on the other rotating door (4). The rotating pin lock (41) slides in cooperation with the sliding hole.

4. The multi-module modular splicing distribution box according to claim 1, characterized in that: The inner wall of the main box (2) is symmetrically and equidistantly connected with multiple baffles (21). The back cover (31) is provided with several horizontally arranged stabilizing grooves. The baffles (21) move within the stabilizing grooves to form a debris blocking barrier. An automatic fire extinguishing device (8) is installed on the inner wall of the main box (2).

5. A multi-module modular splicing distribution box according to claim 2, characterized in that: The symmetrically arranged sub-boxes (3) have multiple hollowed-out ventilation slots (33) equidistantly opened on their opposite sides. The ventilation slots (33) are rotatably connected to louvers (34). The multiple louvers (34) are connected to two symmetrically arranged connecting rods (35). The connecting rods (35) are L-shaped, and the horizontal end of the connecting rods (35) is locked in the limiting slot (37) opened on the top of the sub-boxes (3).

6. A multi-module modular splicing distribution box according to claim 4, characterized in that: The automatic fire extinguishing device (8) includes a base plate (81), a fire extinguisher (82), a linkage rod (83), a linear guide rod (84), a support rod (85), a telescopic rod (86), a rotating cover (87), a return torsion spring (88), and a rubber sleeve (89). One side of the base plate (81) is connected to the inner wall of the main housing (2). The fire extinguisher (82) is installed on the top of the base plate (81). The bottom of the rotating cover (87) is connected to one end of the return torsion spring (88). The other end of the reset torsion spring (88) is connected to the fire extinguisher (82). The outer ring of the output end of the fire extinguisher (82) is rotatably connected to the rotating cover (87). The outer ring of the rotating cover (87) is symmetrically connected to one end of the telescopic rod (86). The other end of the telescopic rod (86) is rotatably connected to one end of the linear guide rod (84). The other end of the linear guide rod (84) is in contact with one end of the linkage rod (83). The other ends of the two linkage rods (83) are respectively connected to the auxiliary housing (3).

7. A multi-module modular splicing distribution box according to claim 6, characterized in that: The output end of the fire extinguisher (82) is fitted with a rubber sleeve (89), and the outer ring of the rubber sleeve (89) is fitted with a rotating cover (87).

8. A multi-module modular splicing distribution box according to claim 6, characterized in that: Both the linear guide rod (84) and the linkage rod (83) are slidably engaged with a support rod (85), which is mounted on the surface of the base plate (81).

9. A multi-module modular splicing distribution box according to claim 1, characterized in that: A rubber buffer pad (51) is installed on the opposite surface of the adjacent pin slider (5). The rubber buffer pad (51) is used to buffer the opposite surface of the pin slider (5) after the elastic element (7) releases the force.

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