Outdoor terminal box with self-extinguishing function

Abstract

The application belongs to the technical field of terminal box, and particularly relates to an outdoor terminal box with a self-extinguishing function, which comprises a box body, a rectangular closed shell structure, an installation cavity for accommodating terminal and electrical elements formed in the box body, perforated plates arranged at intervals on the inner walls of the box body, a gap between the inner wall of the box body and the corresponding perforated plate filled with insulating refractory material, a fire-retardant sealing gasket arranged at the bottom edge of the box body and the matching end face of the box opening, a threading hole arranged on the wall of the box body and at least one, which is used for allowing external cables to pass into the internal cavity, and a fireproof component arranged at the threading hole, which is made of a heat-resistant flexible material containing a thermal expansion material, has a whole conical cylinder structure, and has a through hole formed in the inside along the axial direction for the cables to pass through, and the large-diameter end of the axial direction is a base end, and the base end is provided with a mounting portion.

Description

Technical Field

[0001] This application belongs to the field of junction box technology, and in particular relates to an outdoor junction box with self-extinguishing function. Background Technology

[0002] Outdoor junction boxes are widely used in many fields such as outdoor power distribution, municipal lighting, and communication transmission. They are responsible for line switching, power distribution control and signal relay. These devices are exposed to the open air for a long time and are affected by multiple factors such as sun and rain, temperature changes, dust and moisture and external interference.

[0003] Existing outdoor junction boxes are mostly designed with basic protection features such as dust and water resistance in mind. The interior of the box typically only contains wiring terminals, switching components, and connecting cables, and lacks active fire prevention and extinguishing capabilities. In actual operation, problems such as oxidation and loosening of wiring terminals, aging and damage to cable insulation, and short circuits caused by component breakdown can all trigger initial fires. The confined space inside the box accelerates heat accumulation, causing the fire to spread rapidly to all internal components, and even leading to serious accidents such as box burnout and wire meltdown.

[0004] Current solutions attempt to install external fire extinguishing devices inside junction boxes, but these devices generally have the following problems: some fire extinguishing devices rely on external power supplies or electrical control systems for triggering, outdoor power supply conditions are unstable, and response failures are prone to occur under extreme conditions, making it impossible to guarantee reliable activation in the event of a fire. Furthermore, existing outdoor junction boxes generally lack effective fire spread prevention designs; the openings for cable entry and exit, assembly gaps, and other locations in the box are not fireproofed, allowing flames and high-temperature smoke to easily spread outwards along the gaps after an internal fire, igniting vegetation, cables, and other facilities around the box, causing the fire to expand. External open flames can also enter the box through gaps, further increasing the risk of equipment damage. In unattended outdoor deployment scenarios, fires often cannot be detected and dealt with in a timely manner, easily escalating from small-scale initial faults to large-scale safety accidents, posing safety hazards that require improvement. Summary of the Invention

[0005] The purpose of this application is to provide an outdoor junction box with self-extinguishing function, which can solve the above problems.

[0006] The purpose of this application is to provide an outdoor junction box with self-extinguishing fire function, including: The enclosure is a rectangular, closed shell structure with an internal mounting chamber for accommodating wiring terminals and electrical components. Perforated plates are spaced out on the inner walls of each side of the enclosure. The gap between the inner wall of the enclosure and the corresponding perforated plate is filled with insulating and fire-resistant material. Flame-retardant sealing gaskets are provided at the bottom edge of the enclosure and the mating end face of the enclosure opening. A cable pass-through hole is located on the wall of the enclosure and at least one is provided, which is used to allow external cables to pass into the internal cavity; Fireproof components are installed at the wire hole. The fireproof components are made of heat-resistant flexible material containing thermal expansion material. The whole structure is a conical structure. The interior of the fireproof components has a through hole formed along the axial direction for the cable to pass through. The large diameter end of the fireproof components along the axial direction is the base end, and the base end is provided with a mounting part. The fireproof component is fixedly installed at the cable hole position of the box through the mounting part at the base end. The inner circumferential surface of the fireproof component can be tightly fitted with the outer circumferential surface of the inserted cable. When it is heated by fire, the thermal expansion material inside the fireproof component expands inward to seal the gap between the cable and the cable hole.

[0007] The outdoor junction box with self-extinguishing function described above provides installation space for internal electrical components while forming the first line of fire protection. The perforated plate and insulating fire-resistant material work together to form a heat-insulating and fire-resistant layer on the inner wall of the box, which can effectively block heat from being conducted to the outside of the box and delay the spread of internal fire. At the same time, it can also block the transmission of external high temperature and open flame to the inside of the box, protecting the internal components.

[0008] Meanwhile, flame-retardant sealing gaskets can fill the assembly gaps at the bottom and opening of the enclosure, blocking the airflow between the enclosure and the outside. This can suppress the oxygen supply needed for internal combustion, helping to curb the development of the fire, and also prevent the internal flames and high-temperature smoke from escaping outward, thus avoiding igniting surrounding facilities and causing the disaster to escalate.

[0009] Furthermore, in this application, the fireproof component installed at the wiring hole can form a fireproof sealing structure at the wiring location. Under normal conditions, it fits tightly against the outer periphery of the cable to ensure the sealing and protection performance of the wiring location. When exposed to heat due to fire, it automatically expands due to the properties of its own thermal expansion material, sealing the gap between the cable and the wiring hole, blocking the path of fire spread along the gap between the cable and the wiring hole. This not only prevents the fire from spreading outward along the cable after it starts inside the enclosure, but also prevents external open flames from entering the enclosure through the cable channel.

[0010] Furthermore, a plurality of gaskets with screws are fixedly installed on the inner wall of the box. One end face of the gasket is fixed to the inner wall of the box. The screws extend in a direction perpendicular to the inner wall of the box and pass through the perforated plate. The protruding end of the screws is fitted with a nut. The gaskets are clamped between the inner wall of the box and the perforated plate.

[0011] The fixing structure of this application can stably maintain the gap between the inner wall of the box and the perforated plate, ensuring that the filling space of the insulating refractory material is uniform and consistent. The gasket is clamped between the inner wall of the box and the perforated plate, which can control the gap thickness and ensure that the filling thickness of the insulating refractory material is uniform throughout, avoiding areas with weak local heat insulation capacity due to uneven gaps. The screw and nut engagement method can firmly press the perforated plate onto the gasket. During long-term outdoor operation, it will not loosen or shift due to factors such as temperature differences and environmental vibrations. This can continuously provide stable support and restraint for the insulating refractory material, preventing it from falling off, dropping, or shifting in distribution, ensuring that the heat insulation and fireproof performance of the box is always stable and effective throughout the circumference, and improving the durability of the overall fireproof structure.

[0012] Furthermore: the front of the box is provided with an openable door, the outer surface of the door is provided with a handle, and the inner edge of the door is provided with a flame-retardant gasket. When the door is closed on the box, the flame-retardant gasket is pressed between the mating end faces of the door and the box.

[0013] This structure solves the problems of existing enclosure gaps easily becoming channels for fire spread and insufficient sealing and protection. The openable door meets the opening and closing needs of daily inspection and maintenance operations, and the handle installation facilitates operation and improves the convenience of opening and closing the door. The flame-retardant gasket installed on the inside of the door is pressed between the mating end faces of the door and the enclosure when the door is closed, which can fully fill the assembly gap between the two and form a dense fireproof sealing layer. When a fire occurs inside the enclosure, it can prevent flames and high-temperature smoke from escaping outward from the gaps in the door, preventing the fire from spreading to the outside of the enclosure and causing secondary disasters. When there is an open flame outside, it can also prevent flames and high-temperature smoke from entering the enclosure through the gaps in the door, thus protecting the internal electrical components from being affected. At the same time, the sealing structure can also prevent moisture and dust from the outdoor environment from entering the enclosure, delaying the aging and corrosion of internal components and improving the overall environmental adaptability of the enclosure.

[0014] Furthermore, the diameter of the through hole of the fireproof component gradually decreases along the axial direction from the base end to the front end of the smaller diameter, and the inner diameter of the through hole at the front end matches the outer diameter of the adapter cable. The mounting part at the base end of the fireproof component fits tightly against the entire circumferential edge of the wire hole.

[0015] This structure improves the sealing performance between fireproof components and cables / wiring holes, solving the problems of large gaps and poor fire barrier effect at wiring locations. The through-hole gradually narrows from the base to the front end along the axial direction, allowing the inner wall of the through-hole at the front end of the fireproof component to form a tight fit with the outer periphery of the cable. Under normal conditions, this ensures the sealing performance at the wiring location, preventing moisture and dust from entering the enclosure through the gap between the cable and the through-hole, thereby improving the overall protection level of the enclosure.

[0016] Meanwhile, the mounting portion at the base fits tightly against the entire circumferential edge of the wiring hole, eliminating assembly gaps between the fire-resistant component and the inner wall of the wiring hole. This prevents smoke and flames from flowing through these gaps, enhancing the sealing and fire-resistant effect at the wiring location. The conical through-hole structure also allows the fire-resistant component to apply uniform radial pressure to the outer periphery of the cable when it expands due to heat, ensuring a tight seal after expansion. This effectively blocks the transmission of fire, heat, and smoke along the cable channel, further improving the reliability of fire-resistant blocking at the wiring location.

[0017] Furthermore, the peripheral wall of the fireproof component includes: Inner layer; Outer layer; The outer layer is the shape-maintaining part, and the inner layer is the thermal expansion part. The shape-maintaining part and the thermal expansion part are integrally formed. The thermal expansion part contains thermal expansion material. When heated, the thermal expansion part expands inward toward the through hole, squeezing the outer periphery of the cable and filling the gap between the cable and the fireproof component.

[0018] The double-layer structure of this application takes into account both the structural stability of the fireproof component and the fire-sealing performance, solving the problems of fireproof components being prone to deformation and collapse when heated and the failure of the fire-sealing effect. The outer layer has stable structural strength and can maintain the overall conical shape of the fireproof component under heated conditions. It will not deform or collapse due to heat, ensuring that the fireproof component is always stably limited in the position of the wire hole, and will not shift or fall off, thus continuously playing a sealing role.

[0019] The inner thermal expansion section is mixed with thermal expansion material, which can expand directionally into the through hole after being heated, fully filling all gaps between the cable and the inner wall of the fireproof component, forming a dense fireproof barrier layer. This blocks the transmission path of fire, smoke and heat along the cable channel, thereby achieving fireproof sealing of the wiring location, ensuring the overall structural strength and operational stability of the fireproof component, and extending the effective service life of the fireproof component.

[0020] Furthermore, the outer circumferential surface of the fireproof component is provided with multiple annular cutting grooves spaced along the axial direction. Each cutting groove extends around the entire circumference of the fireproof component, and each cutting groove corresponds to a different through hole inner diameter.

[0021] In this application, the structure improves the universal adaptability of fireproof components, solving the problem that different wire diameters of cables require different specifications of fireproof components and that construction selection is inconvenient. Multiple annular cutting grooves are arranged at intervals along the axial direction, and each cutting groove corresponds to a different through-hole inner diameter. During on-site construction, the corresponding cutting groove can be selected to cut the front end of the fireproof component according to the actual outer diameter of the cable to be inserted, so that the inner diameter of the through-hole at the cut end matches the outer diameter of the cable, ensuring that the cable can form a tight fit with the inner wall of the through-hole after insertion.

[0022] Therefore, the above structure eliminates the need to configure different specifications of fireproof components for cables of various diameters, reducing the types of materials and management costs, and also lowering the difficulty of selection and matching during on-site construction. At the same time, the annular cutting groove provides clear cutting positioning for construction personnel, allowing cutting operations to be completed quickly without additional measurement, effectively improving the efficiency of on-site assembly.

[0023] Furthermore, a through-slot is provided on the peripheral wall of the fireproof component along the axial direction. The slot extends from the front end of the fireproof component to the base end, allowing the fireproof component to open to both sides along the slot.

[0024] The above structure enhances the flexibility of fireproof components during construction, solving the problems of not being able to install fireproof components on existing cables and the inconvenience of on-site construction and modification. The axially continuous slot allows the fireproof component to open to both sides along the slot. In modification scenarios where cables have already been laid and the cable ends cannot be inserted into through holes, the fireproof component can be directly fitted onto the outer circumference of the cable from the side without disassembling the cable ends or re-laying the wiring. This reduces the difficulty of on-site modification and installation, and improves the flexibility and convenience of assembly operations.

[0025] After the cable is inserted, the fireproof component can restore its complete cone shape by relying on its own flexible material. It can still stably fit the outer periphery of the cable and be firmly installed at the cable hole position. The presence of the dividing groove will not affect the installation stability and fireproof sealing performance of the fireproof component, so that the fireproof component can be adapted to various application scenarios such as new construction and existing renovation.

[0026] Furthermore, the inner wall of the fireproof component is provided with multiple contact layers. The inner diameter of the contact layer gradually decreases along the axial direction from the base end to the front end of the smaller diameter. Each contact layer is provided with a contact hole. The contact hole is in close contact with the outer wall of the cable, and the dividing groove also penetrates the contact hole.

[0027] The aforementioned structure forms multiple layers of fireproof sealing and improves the sealing effect with the cable, further enhancing the reliability of the sealing and fireproof barrier at the cable insertion point. This solves the problems of easy failure and unstable fireproof effect of single-layer bonding and sealing. Multiple contact layers are arranged along the axial direction, and the contact holes of each contact layer are tightly attached to the outer wall of the cable, forming a multi-point tight bonding structure along the cable axis. Under normal conditions, it can form multiple sealing barriers, improving the sealing effect of dust and water resistance. When exposed to fire and heat, it can form multiple fireproof sealing lines. Even if the sealing effect of a single contact layer is affected by external factors, the remaining contact layers can still maintain their barrier function, effectively improving the reliability of fireproof sealing at the cable insertion point.

[0028] Meanwhile, as the inner diameter of the contact layer gradually decreases along the axial direction, it is compatible with the conical through-hole structure, ensuring that the contact holes of each layer can stably fit against the outer wall of the cable. Furthermore, the design of the segmented groove through the contact hole allows the fireproof component to be directly inserted into the outer circumference of the cable from the side without disassembling the cable end or rewiring, further improving installation efficiency.

[0029] The beneficial effects of this application are: 1. Fireproof components installed at the cable hole can form a fireproof sealing structure at the cable hole. Under normal conditions, it fits tightly with the outer periphery of the cable to ensure the sealing and protection performance of the cable hole. When exposed to fire and heat, it automatically expands due to the thermal expansion properties of its own material, sealing the gap between the cable and the cable hole and blocking the path of fire spread along the gap between the cable and the cable hole. This prevents the fire from spreading outward along the cable after the fire starts inside the box, and also prevents external open flames from entering the box through the cable channel. 2. A heat-insulating and fireproof layer is formed on the inner wall of the box, which can effectively block heat from being conducted to the outside of the box and slow down the spread of internal fire. At the same time, it can also block the transmission of external high temperature and open flame to the inside of the box, protecting the internal components. 3. Flame-retardant sealing gaskets can fill the assembly gaps at the bottom and opening of the enclosure, blocking the airflow between the enclosure and the outside. This can suppress the oxygen supply required for internal combustion, helping to curb the development of the fire, and also prevent the internal flames and high-temperature smoke from escaping outward, thus avoiding igniting surrounding facilities and causing the disaster to escalate. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a partial cross-sectional structural schematic diagram of the present invention; Figure 3 yes Figure 2 Enlarged view of A in the middle; Figure 4 This is a cross-sectional view of the perforated plate connection of the present invention.

[0031] The reference numerals in the figure are as follows: 100, enclosure; 110, mounting chamber; 120, gasket; 130, screw; 140, door; 150, flame-retardant washer; 160, wiring hole; 200, perforated plate; 210, insulating and fire-resistant material; 220, flame-retardant sealing gasket; 300, fireproof component; 310, through hole; 320, mounting part; 330, inner layer; 340, outer layer; 350, annular cutting groove; 360, dividing groove; 370, contact layer; 380, contact hole. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0033] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0034] The outdoor junction box with self-extinguishing function provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0035] Example 1:

[0036] like Figures 1 to 4 As shown in the figure, this application embodiment provides an outdoor junction box with self-extinguishing function, including: The enclosure 100 has a rectangular, enclosed shell structure, with an internal mounting chamber 110 for accommodating wiring terminals and electrical components; Perforated plates 200 are spaced apart on the inner wall of each side of the box 100. The gap between the inner wall of the box 100 and the corresponding perforated plate 200 is filled with insulating fire-resistant material 210. Flame-retardant sealing gaskets 220 are provided at the bottom edge of the box 100 and the mating end face of the box opening. A cable threading hole 160 is located on the wall of the housing 100 and at least one is provided, which is used to allow external cables to pass into the internal cavity; Fireproof component 300 is provided at wire hole 160. Fireproof component 300 is made of heat-resistant flexible material containing thermal expansion material. It has an overall conical structure. The interior of fireproof component 300 has a through hole 310 for cable to pass through along the axial direction. The large diameter end of fireproof component 300 in the axial direction is the base end, and the base end is provided with mounting part 320. The fireproof component 300 is fixedly installed in the wiring hole 160 of the housing 100 through the mounting part 320 at the base end. The inner circumferential surface of the fireproof component 300 can be tightly fitted with the outer circumferential surface of the inserted cable. When exposed to fire and heat, the thermal expansion material inside the fireproof component 300 expands inward to seal the gap between the cable and the wiring hole 160.

[0037] In some embodiments of this application, such as Figure 1 As shown, the outdoor junction box with self-extinguishing function described above provides installation space for internal electrical components through the enclosed shell structure of the box 100, while forming the first fire barrier. The perforated plate 200 and the insulating fire-resistant material 210 work together to form a heat-insulating and fire-resistant layer on the inner wall of the box 100, which can effectively block heat from being conducted to the outside of the box 100, delay the outward spread of internal fire, and also block external high temperature and open flame from being transmitted to the inside of the box 100, thus protecting the internal components.

[0038] Meanwhile, the flame-retardant sealing gasket 220 can fill the assembly gap between the bottom and the opening of the box 100, blocking the air circulation channel between the box 100 and the outside. This can suppress the oxygen supply required for internal combustion, help curb the development of the fire, and prevent the internal flames and high-temperature smoke from escaping outward, thus avoiding igniting surrounding facilities and causing the disaster to escalate.

[0039] Furthermore, in this application, the fireproof component 300 installed at the wiring hole 160 can form a fireproof sealing structure at the wiring location. Under normal conditions, it fits tightly against the outer periphery of the cable to ensure the sealing and protection performance of the wiring location. When exposed to fire and heat, it automatically expands due to the properties of its own thermal expansion material, sealing the gap between the cable and the wiring hole 160, blocking the path of fire spread along the gap between the cable and the wiring hole 160. This prevents the fire from spreading outward along the cable after a fire starts inside the enclosure 100, and also prevents external open flames from entering the enclosure 100 along the cable channel.

[0040] Furthermore, multiple washers 120 with screws 130 are fixedly installed on the inner wall of the housing 100. One end face of the washer 120 is fixed to the inner wall of the housing 100. The screws 130 extend in a direction perpendicular to the inner wall of the housing 100 and pass through the perforated plate 200. A nut is installed at the protruding end of the screws 130. The washers 120 are clamped between the inner wall of the housing 100 and the perforated plate 200.

[0041] The fixing structure of this application can stably maintain the gap between the inner wall of the box 100 and the perforated plate 200, ensuring that the filling space of the insulating refractory material 210 is uniform. The gasket 120 is clamped between the inner wall of the box 100 and the perforated plate 200, which can control the gap thickness and ensure that the filling thickness of the insulating refractory material 210 is uniform throughout, avoiding areas with weak local heat insulation capacity due to uneven gaps. The engagement of the screw 130 and the nut can firmly press the perforated plate 200 onto the gasket 120. During long-term outdoor operation, it will not loosen or shift due to factors such as temperature differences and environmental vibrations, thus continuously providing stable support and limiting for the insulating refractory material 210, preventing the insulating refractory material 210 from falling off, dropping, or shifting in distribution, ensuring that the heat insulation and fireproof performance of the box 100 is always stable and effective throughout the circumference, and improving the durability of the overall fireproof structure.

[0042] Example 2:

[0043] This application provides an outdoor junction box with self-extinguishing function. In addition to the above-mentioned technical features, the outdoor junction box with self-extinguishing function in this application also includes the following technical features.

[0044] like Figure 1 and Figure 2 As shown, the front of the box 100 is provided with an openable door 140. The outer surface of the door 140 is provided with a handle. A flame-retardant gasket 150 is provided on the inner edge of the door 140. When the door 140 is closed on the box 100, the flame-retardant gasket 150 is pressed between the mating end face of the door 140 and the box 100.

[0045] In this embodiment, the structure solves the problems of existing enclosure 100's opening gaps easily becoming channels for fire spread and insufficient sealing and protection performance. The openable enclosure door 140 meets the opening and closing needs of daily inspection and maintenance operations, and the handle installation facilitates the operator's grip and force application, improving the convenience of opening and closing the enclosure door 140. The flame-retardant gasket 150 provided on the inner side of the enclosure door 140 is pressed between the mating end faces of the enclosure door 140 and the enclosure 100 when the enclosure door 140 is closed, which can fully fill the assembly gap between the two and form a dense sealing fireproof layer. When a fire occurs inside the enclosure 100, it can prevent flames and high-temperature smoke from escaping outward from the gaps in the enclosure door 140, avoiding the fire from spreading to the outside of the enclosure 100 and causing secondary disasters; when an open flame appears outside, it can also prevent flames and high-temperature smoke from entering the interior of the enclosure 100 through the gaps in the enclosure door 140, thereby protecting the internal electrical components from being affected. Meanwhile, the sealed structure can also prevent moisture and dust from the outdoor environment from entering the interior of the enclosure 100, delay the aging and corrosion of internal components, and improve the overall environmental adaptability of the enclosure 100.

[0046] Example 3:

[0047] This application provides an outdoor junction box with self-extinguishing function. In addition to the above-mentioned technical features, the outdoor junction box with self-extinguishing function in this application also includes the following technical features.

[0048] like Figures 1 to 3 As shown, the diameter of the through hole 310 of the fireproof component 300 gradually decreases from the base end to the front end of the small diameter along the axial direction. The inner diameter of the through hole at the front end matches the outer diameter of the adapter cable. The mounting part 320 at the base end of the fireproof component 300 fits tightly against the entire circumferential edge of the wire hole 160.

[0049] In this embodiment, the structure improves the sealing performance between the fireproof component 300 and the cable / wiring hole 160, solving the problems of large gaps and poor fireproof barrier effect at the wiring location. The through hole 310 gradually narrows from the base to the front end along the axial direction, allowing the inner wall of the through hole at the front end of the fireproof component 300 to form a tight fit with the outer periphery of the cable. Under normal conditions, this ensures the sealing performance at the wiring location, preventing moisture and dust from entering the enclosure 100 through the gap between the cable and the through hole, thereby improving the overall protection level of the enclosure 100.

[0050] Meanwhile, the mounting portion 320 at the base fits tightly against the entire circumferential edge of the wiring hole 160, eliminating the assembly gap between the fireproof component 300 and the inner wall of the wiring hole 160. This prevents smoke and flames from flowing through the assembly gap, enhancing the sealing and fireproofing effect at the wiring location. The conical through-hole structure also allows the fireproof component 300 to apply uniform radial pressure to the outer periphery of the cable when heated and expanding, ensuring the tightness of the seal after expansion. This effectively blocks the transmission of fire, heat, and smoke along the cable channel, further improving the fireproof blocking reliability at the wiring location.

[0051] Example 4:

[0052] This application provides an outdoor junction box with self-extinguishing function. In addition to the above-mentioned technical features, the outdoor junction box with self-extinguishing function in this application also includes the following technical features.

[0053] like Figures 1 to 3 As shown, the perimeter wall of the fireproof component 300 includes: Inner layer 330; Outer layer 340; The outer layer 340 is the shape-maintaining part, and the inner layer 330 is the thermal expansion part. The shape-maintaining part and the thermal expansion part are integrally formed. The thermal expansion part contains thermal expansion material. When heated, the thermal expansion part expands in the direction of the through hole, squeezing the outer periphery of the cable and filling the gap between the cable and the fireproof component 300.

[0054] In this embodiment, the double-layer structure of this application takes into account both the structural stability and fire-stopping performance of the fireproof component 300, solving the problems of easy deformation and collapse of the fireproof component 300 when heated and the failure of the fire-stopping effect. The outer layer 340 has stable structural strength and can maintain the overall conical shape of the fireproof component 300 under heated conditions. It will not deform or collapse due to heat, ensuring that the fireproof component 300 is always stably limited at the position of the wire hole 160, and will not shift or fall off, thus continuously playing a sealing role.

[0055] The inner layer 330 contains a thermal expansion material that expands directionally into the through-hole when heated, fully filling all gaps between the cable and the inner wall of the fireproof component 300, forming a dense fireproof barrier layer. This blocks the transmission path of fire, smoke, and heat along the cable channel, thereby achieving fireproof sealing of the wiring location, ensuring the overall structural strength and operational stability of the fireproof component 300, and extending the effective service life of the fireproof component 300.

[0056] Example 5:

[0057] This application provides an outdoor junction box with self-extinguishing function. In addition to the above-mentioned technical features, the outdoor junction box with self-extinguishing function in this application also includes the following technical features.

[0058] like Figures 1 to 3 As shown, multiple annular cutting grooves 350 are provided axially at intervals on the outer peripheral surface of the fireproof component 300. Each cutting groove extends around the entire circumference of the fireproof component 300, and each cutting groove corresponds to a different through hole inner diameter.

[0059] In this embodiment, the structure improves the versatility of the fireproof component 300, solving the problem that different diameter cables require different specifications of fireproof components 300, making construction selection inconvenient. Multiple annular cutting grooves 350 are spaced axially, each corresponding to a different through-hole inner diameter. During on-site construction, the corresponding cutting groove can be selected to cut the front end of the fireproof component 300 according to the actual outer diameter of the cable being inserted, ensuring that the inner diameter of the through-hole after cutting matches the outer diameter of the cable, guaranteeing a tight fit between the cable and the inner wall of the through-hole after insertion.

[0060] Therefore, by adopting the above structure, it is not necessary to configure different specifications of fireproof components 300 for cables of various diameters, which reduces the types of materials and management costs, and also reduces the difficulty of selection and matching on site. At the same time, the annular cutting groove 350 provides clear cutting positioning for construction personnel, and the cutting operation can be completed quickly without additional measurement, effectively improving the efficiency of on-site assembly.

[0061] Example 6:

[0062] This application provides an outdoor junction box with self-extinguishing function. In addition to the above-mentioned technical features, the outdoor junction box with self-extinguishing function in this application also includes the following technical features.

[0063] like Figures 1 to 3 As shown, a through-cut groove 360 ​​is provided on the peripheral wall of the fireproof component 300 along the axial direction. The cutting groove 360 ​​extends from the front end of the fireproof component 300 to the base end, so that the fireproof component 300 can open to both sides along the cutting groove 360.

[0064] The above structure enhances the construction adaptability of the fireproof component 300, solving the problems of not being able to install the fireproof component 300 on existing cables and the inconvenience of on-site construction and modification. The axially continuous dividing groove 360 ​​allows the fireproof component 300 to open to both sides along the dividing groove 360. In modification scenarios where cables have already been laid and the cable ends cannot be inserted into through holes, the fireproof component 300 can be directly inserted into the outer periphery of the cable from the side without disassembling the cable ends or re-laying the wiring. This reduces the construction difficulty of on-site modification and installation, and improves the flexibility and convenience of assembly operations.

[0065] After the cable is inserted, the fireproof component 300 can restore its complete cone shape by relying on its own flexible material. It can still stably fit the outer periphery of the cable and be firmly installed at the wire hole 160 position. The presence of the dividing groove 360 ​​will not affect the installation stability and fireproof sealing performance of the fireproof component 300, so that the fireproof component 300 can be adapted to various application scenarios such as new construction and existing renovation.

[0066] Furthermore, the inner wall of the fireproof component 300 is provided with multiple contact layers 370. The inner diameter of the contact layer 370 gradually decreases along the axial direction from the base end to the front end of the smaller diameter. Each contact layer 370 is provided with a contact hole 380. The contact hole 380 is in close contact with the outer wall of the cable, and the dividing groove 360 ​​also penetrates the contact hole 380.

[0067] The aforementioned structure forms multiple layers of fireproof sealing and improves the sealing effect with the cable, further enhancing the reliability of the sealing and fireproof barrier at the cable insertion point. This solves the problems of easy failure and unstable fireproof effect of single-layer bonding and sealing. Multiple contact layers 370 are arranged axially, and the contact holes 380 of each contact layer 370 are tightly attached to the outer wall of the cable, forming a multi-point tight bonding structure along the cable axis. Under normal conditions, it can form multiple sealing barriers, improving the sealing effect of dust and water resistance. When exposed to fire and heat, it can form multiple fireproof sealing lines. Even if the sealing effect of a single contact layer 370 is affected by external factors, the remaining contact layers 370 can still maintain their barrier function, effectively improving the reliability of fireproof sealing at the cable insertion point.

[0068] Meanwhile, because the inner diameter of the contact layer 370 gradually decreases along the axial direction, it matches the conical through-hole structure, ensuring that the contact holes 380 of each layer can stably fit against the outer wall of the cable. Furthermore, the design of the dividing groove 360 ​​passing through the contact holes 380 allows the fireproof component 300 to be directly inserted into the outer circumference of the cable from the side without disassembling the cable end or rewiring, further improving installation efficiency.

[0069] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0070] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An outdoor junction box with self-extinguishing fire function, characterized in that: include: The enclosure (100) has a rectangular closed shell structure, with an internal mounting chamber (110) for accommodating wiring terminals and electrical components; Perforated plates (200) are spaced apart on the inner wall of each side of the box (100). The gap between the inner wall of the box (100) and the corresponding perforated plate (200) is filled with insulating fire-resistant material (210). Flame-retardant sealing gaskets (220) are provided at the bottom edge of the box (100) and the mating end face of the box opening. A cable pass-through hole (160) is provided on the wall of the housing (100) and at least one is provided, which is used to allow external cables to pass into the internal cavity; Fireproof component (300) is provided at the wire hole (160). The fireproof component (300) is made of heat-resistant flexible material containing thermal expansion material and has an overall conical structure. The interior of the fireproof component (300) has a through hole (310) for the cable to pass through along the axial direction. The large diameter end of the fireproof component (300) in the axial direction is the base end, and the base end is provided with a mounting part (320). The fireproof component (300) is fixedly installed in the wiring hole (160) of the box (100) by the mounting part (320) at the base end. The inner circumferential surface of the fireproof component (300) can be tightly fitted with the outer circumferential surface of the inserted cable. When it is heated by fire, the thermal expansion material inside the fireproof component (300) expands inward to seal the gap between the cable and the wiring hole (160).

2. An outdoor junction box with self-extinguishing function according to claim 1, characterized in that: Multiple gaskets (120) with screws (130) are fixedly installed on the inner wall of the box (100). One end face of the gasket (120) is fixed on the inner wall of the box (100). The screw (130) extends in a direction perpendicular to the inner wall of the box (100) and passes through the perforated plate (200). A nut is installed at the protruding end of the screw (130). The gasket (120) is clamped between the inner wall of the box (100) and the perforated plate (200).

3. An outdoor junction box with self-extinguishing function according to claim 1, characterized in that: The front of the box (100) is provided with an openable door (140). The outer surface of the door (140) is provided with a handle. A flame-retardant gasket (150) is provided on the inner edge of the door (140). When the door (140) is closed on the box (100), the flame-retardant gasket (150) is pressed between the mating end faces of the door (140) and the box (100).

4. An outdoor junction box with self-extinguishing function according to claim 1, characterized in that: The diameter of the through hole (310) of the fireproof component (300) gradually decreases from the base end to the front end of the small diameter along the axial direction. The inner diameter of the through hole at the front end matches the outer diameter of the adapter cable. The mounting part (320) at the base end of the fireproof component (300) fits tightly against the entire circumferential edge of the wire hole (160).

5. An outdoor junction box with self-extinguishing function according to claim 4, characterized in that: The peripheral wall of the fireproof component (300) includes: Inner layer (330); Outer layer (340); Among them, the outer layer (340) is the shape maintenance part, and the inner layer (330) is the thermal expansion part. The shape maintenance part and the thermal expansion part are integrally formed. The thermal expansion part is mixed with thermal expansion material. When heated, the thermal expansion part expands in the direction of the through hole, squeezing the outer periphery of the cable and filling the gap between the cable and the fireproof component (300).

6. An outdoor junction box with self-extinguishing function according to claim 4, characterized in that: The fireproof component (300) has multiple annular cutting grooves (350) spaced axially on its outer peripheral surface. Each cutting groove extends around the circumference of the fireproof component (300), and each cutting groove corresponds to a different through hole inner diameter.

7. An outdoor junction box with self-extinguishing function according to claim 6, characterized in that: The fireproof component (300) has a through-slot (360) on its peripheral wall along the axial direction. The slot (360) extends from the front end of the fireproof component (300) to the base end, so that the fireproof component (300) can open to both sides along the slot (360).

8. An outdoor junction box with self-extinguishing function according to claim 7, characterized in that: The fireproof component (300) has multiple contact layers (370) on its inner wall. The inner diameter of the contact layer (370) gradually decreases from the base end to the front end of the smaller diameter along the axial direction. Each contact layer (370) has a contact hole (380) which is in close contact with the outer wall of the cable. The dividing groove (360) also penetrates the contact hole (380).

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