Fireproof plugging device for underground space

Abstract

The application discloses an underground space fireproof plugging device, and belongs to the technical field of fireproof plugging. The fireproof plugging device comprises a control system, a metal channel penetrating through a wall body and fixedly connected to the wall body, a thermal expansion sealing layer arranged on the inner wall of the metal channel, a detection structure arranged on the inner wall of the metal channel, and a blocking structure arranged at both ends of the metal channel and used for blocking the smoke and fire propagation paths at both ends of the metal channel. The underground space fireproof plugging device relies on the thermal expansion sealing layer to complete passive plugging by foaming when heated, cooperates with the detection structure to reduce false triggering by double-parameter identification, and controls the driving assembly to drive the gate and the fixed seat to block the smoke and fire, so that double protection of passive plugging and mechanical blocking is formed. Meanwhile, the gate is gravity-locked by setting a thermal-sensitive disengaging piece to be fused at high temperature, electric control and gravity double-mode redundant plugging are realized, the problem of power failure is prevented, the plugging stability under extreme working conditions is improved, and the fire safety of the cable wall-penetrating part is strengthened.

Description

Technical Field

[0001] This application relates to the field of fireproof sealing technology, specifically a fireproof sealing device for underground spaces. Background Technology

[0002] In underground spaces, fireproof sealing of cable penetration holes in fire-resistant partition walls is a crucial step in ensuring the integrity of fire-resistant partitions during a fire.

[0003] Currently, fireproof sealing of cable penetration holes mainly uses passive materials such as fireproof tape, fireproof pillows, intumescent fireproof sealant, or fireproof putty for manual filling and sealing. This type of sealing method relies solely on the thermal expansion of a single material to achieve sealing and blocking. Although it can fill the gap between the cable and the wall hole at room temperature, it is limited by the foaming expansion rate of the material. After a fire occurs, it takes a certain amount of time to fully expand and compact, which leads to a problem of delayed sealing response. Before the foamed material has fully expanded, flames and smoke can spread into adjacent fire compartments through the gaps around the cable, expanding the affected area. Furthermore, Chinese utility model patent CN210074671U discloses a fire-stopping device. It uses a manual knob in conjunction with a gear ring to drive multiple blades to open and close the cable channel, effectively sealing the channel and preventing the fire from spreading along the cable when it catches fire. However, this device relies solely on the closing of the blades to form a single mechanical barrier. After the blades close, an annular gap remains between the cable's outer wall and the blades, allowing high-temperature smoke and flames to easily penetrate and spread across the area.

[0004] Therefore, this application provides a fireproof sealing device for underground spaces to solve the above-mentioned problems. Summary of the Invention

[0005] This application provides a fire-sealing device for underground spaces, aiming to solve the problem that the existing single thermal expansion passive material foaming response has a lag, while the purely mechanical sealing structure cannot eliminate irregular gaps at cable penetration points. Both are difficult to achieve rapid and complete smoke and fire sealing in the early stages of a fire.

[0006] To achieve the above objectives, this application provides the following technical solution: an underground space fireproof sealing device, comprising a control system, a metal channel penetrating through a wall and fixedly connected to the wall for cable passage, a thermal expansion sealing layer disposed on the inner wall of the metal channel for filling the metal channel upon heating to seal and prevent fire, a detection structure disposed on the inner wall of the metal channel for detecting temperature and smoke concentration, and a barrier structure disposed at both ends of the metal channel for blocking the smoke and fire propagation path at both ends of the metal channel; The barrier structure includes fixed bases respectively fixedly installed at the two ends of the metal channel and located below the cable, gates respectively disposed on the metal channel and located above the corresponding fixed bases for isolating the metal channel from opening and closing, a drive assembly disposed on the metal channel for driving the gates to descend and close, and a thermal disconnecting component disposed between the drive assembly and the gates for high-temperature melting to disconnect the gates and the drive assembly. The detection structure is connected to the input of the control system, and the drive component is connected to the output of the control system. A passive fireproof sealing base is formed by a thermally expanding sealing layer within the metal channel that normally adheres to the cable and self-fills the channel gaps upon exposure to fire. This, combined with the detection structure, synchronously collects temperature and smoke signals, transmitting them to the control system for composite identification to reduce the probability of false triggering in underground environments. The control system then links the drive component to move the gate downwards, enclosing the cable with the fixed base to achieve physical isolation of smoke and fire at both ends of the channel. This dual protection mechanism of passive material sealing and mechanical blocking improves the active sealing response speed and the isolation efficiency in the early stages of a fire. Simultaneously, a thermally sensitive release component is installed between the drive component and the gate. In the event of circuit failure or high temperature, the component melts, allowing the gate to automatically descend and close under gravity. This achieves dual-mode redundancy release of electrical control and mechanical gravity, preventing power failure and improving the fireproof sealing stability of the device under extreme conditions, thus enhancing the overall fire safety performance of the cable penetration node.

[0007] Preferably, in order to achieve fireproof sealing of the entire passage without blind spots, the thermal expansion sealing layer includes an arc-shaped foam material fixedly connected to the inner wall of the metal passage and located above and below the cable, and a foam material curtain fixedly connected to the inner wall of the metal passage near the two end outlets; the arc-shaped foam material on the inner wall of the metal passage adaptively conforms to the cable body and cooperates with the foam material curtains at both ends to seal the gaps at the ports. After being heated, the whole structure expands synchronously to fill the gaps, achieving a double seal inside the passage and at the ports, preventing smoke and fire leakage, and improving the integrity of the passive sealing.

[0008] Preferably, in order to improve the accuracy of fire detection, the detection structure includes temperature sensors respectively installed inside both ends of the metal channel and a smoke detector installed on one side of the temperature sensor. Both the temperature sensor and the smoke detector are connected to the input terminal of the control system. By synchronously collecting signals from the temperature sensor and the smoke detector on the detection structure and transmitting them to the control system for composite judgment, interference signals from the underground environment can be filtered, the probability of false triggering of the device can be reduced, and the accuracy of fire detection and linkage control can be improved.

[0009] Preferably, to protect the detection components and ensure detection stability, the detection structure further includes a protective shell fixedly installed inside the metal channel and covering the outside of the corresponding temperature sensor and smoke detector, a uniformly distributed mesh on the protective shell, and a moisture-absorbing material placed inside the protective shell. The temperature sensor and smoke detector are both fixedly installed on the inner wall of the protective shell. By encasing the temperature sensor and smoke detector in the protective shell, and using the mesh to ensure normal penetration and detection of the fire signal, combined with the internal moisture-absorbing material for moisture prevention, the detection structure can be reduced from dust accumulation and moisture damage, thereby improving the working stability and service life of the device in harsh environments and ensuring the effective triggering of the fire detection signal blocking function.

[0010] Preferably, in order to adapt to the sealed shape of the cable, the fixed seat and the gate are provided with arc-shaped grooves on the sides close to each other for the cable to pass through. The inner wall of the arc-shaped groove is fixedly provided with a flexible fire-resistant buffer layer for contact with the cable. By adapting the arc-shaped grooves of the fixed seat and the gate to fit the cable contour and surround it, the flexible fire-resistant buffer layer on the inner wall of the arc-shaped groove flexibly hugs the cable, which not only eliminates the closing gap and enhances the fire-resistant isolation effect, but also buffers the extrusion pressure and protects the cable structure from damage.

[0011] Preferably, to achieve gate lifting and lowering, the drive assembly includes a fixed frame fixedly installed on the outside of the metal channel and located above the gate, a servo electric cylinder fixedly installed on the fixed frame for driving the gate lifting and lowering, and a through groove formed in the metal channel for guiding the gate to slide. The servo electric cylinder is connected to the output end of the control system, and the thermal release component is fixedly connected to the piston rod of the servo electric cylinder and the gate respectively. By providing electrically controlled driving force through the servo electric cylinder, and cooperating with the through groove of the metal channel to limit and guide the gate, the gate can be smoothly lifted, lowered, and closed.

[0012] Preferably, in order to achieve high-temperature melting, the thermal release component is a fusible alloy block; by using a fusible alloy block as the thermal release medium, the reliability of the connection between the servo cylinder and the gate under normal working conditions is ensured, and the servo cylinder can quickly melt and fail under high-temperature conditions, cutting off the force transmission path between the servo cylinder and the gate, and providing triggering conditions for the gate to automatically descend and close by gravity.

[0013] Preferably, to facilitate high-temperature melting, the fusible alloy block is teardrop-shaped, with its tip fixedly connected to the end of the piston rod of the servo cylinder, and its flat end fixedly connected to the side of the gate away from the fixed seat. This teardrop-shaped fusible alloy block, with its tip connected to the piston rod and its flat end connected to the gate, ensures that the tip melts preferentially during melting, allowing for rapid separation of the piston rod and the gate. This guarantees that the gate can promptly seal under gravity in case of circuit failure or high-temperature conditions, improving the reliability of protection under extreme fire conditions.

[0014] This underground space fireproof sealing device achieves passive basic sealing by the thermal expansion sealing layer in the metal channel foaming when heated. Combined with the dual-parameter fire identification of the detection structure, it reduces false triggering. Then, the drive component drives the gate to descend and surround the cable with the fixed seat to physically isolate the smoke and fire at both ends of the channel. It realizes a dual protection mechanism of passive material sealing and mechanical blocking, which improves the active sealing response speed and the isolation efficiency in the early stage of fire. The underground space fire-blocking device uses a thermally sensitive release component between the drive assembly and the gate. In the event of circuit failure or high temperature, the component melts and melts, allowing the gate to automatically descend and close by gravity. This achieves dual-mode redundant release of electrical control and mechanical gravity, avoids power failure, improves the fire-blocking stability of the device under extreme conditions, and enhances the overall fire safety performance of cable penetration nodes. This underground space fireproof sealing device protects temperature sensors and smoke detectors by encasing them in a protective shell. The mesh structure ensures that fire signals can penetrate and be detected normally. Combined with internal moisture-absorbing materials, it reduces the risk of dust accumulation and moisture damage to the detection structure, improving the device's stability and lifespan in harsh environments and ensuring that the fire detection signal guarantees the effective triggering of the sealing function. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the application structure of a fire-blocking device for underground spaces. Figure 2 A schematic diagram of a fire-blocking device for underground spaces; Figure 3 A cross-sectional structural schematic diagram of a fire-blocking device for underground spaces; Figure 4 A schematic diagram of the explosion structure of a detection structure in an underground space fireproof sealing device; Figure 5 This is a schematic diagram of the drive component in a fireproof sealing device for underground spaces. Figure 6 This is a schematic diagram of the structure of a heat-sensitive release element in a fireproof sealing device for underground spaces.

[0016] In the picture: 1. Metal channel; 2. Thermal expansion sealing layer; 21. Arc-shaped foam material; 22. Foam material door curtain; 3. Detection structure; 31. Temperature sensor; 32. Smoke detector; 33. Protective housing; 34. Mesh; 4. Barrier structure; 41. Fixing base; 42. Gate; 43. Drive assembly; 431. Fixing frame; 432. Servo electric cylinder; 433. Through groove; 44. Thermal release component; 441. Fusible alloy block; 45. Arc groove; 451. Flexible fire-resistant buffer layer. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] Example 1 This embodiment provides a fireproof sealing device for underground spaces, such as... Figures 1-6 As shown, the fireproof sealing device includes a control system, a metal channel 1 that penetrates the wall and is fixedly connected to the wall for cables to pass through, a thermal expansion sealing layer 2 installed on the inner wall of the metal channel 1 for filling the metal channel 1 to seal and prevent fire when heated, a detection structure 3 installed on the inner wall of the metal channel 1 for detecting temperature and smoke concentration, and a barrier structure 4 installed at both ends of the metal channel 1 to block the path of smoke and fire at both ends of the metal channel 1. The barrier structure 4 includes a fixing seat 41 fixedly installed at the outlets at both ends of the metal channel 1 and located below the cables, a gate 42 installed on the metal channel 1 and located above the corresponding fixing seat 41 for isolating the opening and closing of the metal channel 1, a drive assembly 43 installed on the metal channel 1 for driving the gate 42 to descend and close, and a thermally sensitive disconnecting component 44 installed between the drive assembly 43 and the gate 42 for high-temperature melting to disconnect the connection between the gate 42 and the drive assembly 43. The detection structure 3 is connected to the input end of the control system, and the drive assembly 43 is connected to the output end of the control system.

[0019] In order to achieve fireproof sealing of the entire passage without dead angles, the thermal expansion sealing layer 2 includes an arc-shaped foam material 21 fixedly connected to the inner wall of the metal passage 1 and located above and below the cable, and a foam material curtain 22 fixedly connected to the inner wall of the metal passage 1 near the two end outlets. The arc-shaped foam material 21 on the inner wall of the metal passage 1 adaptively fits the cable body and cooperates with the foam material curtains 22 at both ends to seal the gaps at the ports. After being heated, the whole structure foams synchronously to fill the gaps, achieving double sealing of the passage interior and ports, preventing smoke and fire leakage, and improving the integrity of the passive sealing.

[0020] In use, the cable is laid through a metal channel 1 fixed inside the wall. The upper and lower sides of the cable are fitted with curved foam material 21 against the inner wall of the metal channel 1. Foam material curtains 22 are installed at both ends of the metal channel 1. The curved foam material 21 and the foam material curtains 22 together form a thermal expansion sealing layer 2. Under normal conditions, it adheres to the outer wall of the cable based on its own elasticity, filling the tiny gap between the cable and the wall of the metal channel 1, without restricting the normal installation of the cable. When a fire occurs in the underground space and a high temperature is generated on one side of the cable, the heat is conducted to the interior of the metal channel 1. The curved foam material 21 and the foam material curtains 22 in the thermal expansion sealing layer 2 rapidly expand upon heating, automatically filling the metal channel. 1. All cable gaps and openings at both ends of the passage are sealed using the fire-resistant foaming properties of the material itself, forming the first passive fireproof sealing barrier to prevent initial smoke and fire from spreading to the other fire compartment along the internal gaps of the metal passage 1. Simultaneously with the passive sealing of the thermal expansion sealing layer 2, the detection structure 3 located on the inner wall of the metal passage 1 continuously collects two types of fire data in real time: internal temperature and smoke concentration. The collected detection signals are continuously transmitted to the input of the control system to complete real-time signal transmission. The control system has a preset composite fire judgment logic. If only a single parameter is abnormal, it is judged as environmental interference and the gate 42 is not triggered to descend. Only when the detection structure 3 detects both the high temperature exceeding the threshold and the smoke signal is a judgment made. In the event of a real fire, a closing control signal is output to the drive assembly 43. Upon receiving the downward drive signal from the control system, the drive assembly 43 begins to output power, causing the gate 42 inside the barrier structure 4 to move vertically downwards along the sliding path of the metal channel 1. The gate 42 continues to descend until it aligns with the fixed seats 41 installed below the outlet cables at both ends of the metal channel 1. The gate 42 and the fixed seats 41 enclose the cable passing through the middle, simultaneously forming a physical isolation barrier from both ends of the metal channel 1, constructing a second active mechanical fire barrier. This barrier bidirectionally prevents the spread of smoke and fire across zones. The rigid connection between the drive assembly 43 and the gate 42 is achieved by the heat-sensitive release component 44, ensuring normal ventilation. Under electrical conditions, the drive assembly 43 can stably drive the gate 42 to rise and fall. If the high temperature of the fire burns the power supply line, the control system and the overall circuit of the drive assembly 43 fail, and the gate 42 cannot be closed by electrical control, the high temperature will directly heat the heat-sensitive release component 44 and melt it. After the heat-sensitive release component 44 melts, it directly disconnects the connection constraint between the drive assembly 43 and the gate 42. The gate 42, which is no longer restrained by tension, will automatically slide down under its own gravity and fit with the lower fixed seat 41 to complete the cable sealing. Under the extreme fire conditions where all electrical control fails, it relies on gravity self-locking to complete the bottom fireproof isolation. Combined with the passive protection of the previous thermal expansion sealing layer 2 foam sealing, a multi-layer progressive fireproof blocking system is formed.

[0021] Specifically, the detection structure 3 includes a temperature sensor 31 disposed inside both ends of the metal channel 1 and a smoke detector 32 disposed on one side of the temperature sensor 31. Both the temperature sensor 31 and the smoke detector 32 are connected to the input of the control system.

[0022] During normal operation, temperature sensors 31, located inside both ends of the metal channel 1, continuously collect real-time ambient temperature data. Simultaneously, smoke detectors 32, located on one side of the temperature sensors 31, continuously monitor changes in smoke concentration inside the metal channel 1. Both temperature sensors 31 and smoke detectors 32 continuously transmit their collected temperature and smoke concentration signals to the input of the control system. The control system continuously receives these two types of monitoring signals from the temperature sensors 31 and smoke detectors 32, and simultaneously compares and judges the two sets of signal values ​​in real time. If only temperature sensor 31 detects an excessive temperature and smoke detector 32 does not collect smoke, or if only smoke detector 32 captures a small amount of smoke and temperature sensor 31 detects... When the temperature is within the normal range, the control system determines that the signal is an interference signal such as dust in the underground environment or slight heating of cables, and does not issue a gate 42 closing command to the drive component 43. It only retains the abnormal record. Only when the temperature sensor 31 detects that the temperature exceeds the preset fire protection threshold and the smoke detector 32 simultaneously detects smoke that has reached the warning concentration, and the two types of fire characteristic signals meet the alarm conditions at the same time, does the control system determine that a real fire has occurred inside the metal channel 1. It then generates a gate 42 downward control signal and sends it from the output end to the drive component 43. This can filter out single abnormal interference under complex underground working conditions, avoid meaningless false closing of the gate 42, ensure the accuracy of fire identification, and only start the subsequent mechanical sealing process after confirming a real fire.

[0023] Furthermore, both the fixed base 41 and the gate 42 are provided with arc-shaped grooves 45 for cables to pass through on their respective sides, and a flexible fire-resistant buffer layer 451 for contacting the cables is fixedly provided on the inner wall of the arc-shaped grooves 45.

[0024] Under normal conditions, the cable passes through the metal channel 1 and through the arc-shaped groove 45 between the fixed seat 41 and the gate 42. The outer wall of the cable is slightly in contact with the flexible fire-resistant buffer layer 451 laid on the inner wall of the arc-shaped groove 45. The flexible fire-resistant buffer layer 451 plays a role in isolation and buffering during normal operation of the cable, preventing the cable from directly rubbing against the metal fixed seat 41 and the gate 42 and causing insulation damage. When the control system detects a fire and drives the gate 42 to move downward, the gate 42 continues to move downward until it is fully connected with the fixed seat 41 below. The upper and lower sets of arc-shaped grooves 45 close together to form a complete circular cable passage cavity. The flexible fire-resistant buffer layer 451 on the inner wall tightly wraps around the cable. On the one hand, the fire-resistant material of the flexible fire-resistant buffer layer 451 seals the small gaps around the cable after the arc groove 45 is closed, preventing smoke and fire from spreading outward from the enclosed gap. On the other hand, the flexible fire-resistant buffer layer 451 uses its own elasticity to buffer the impact and squeezing force generated by the falling gate 42, preventing the gate 42 from squeezing and scratching or damaging the cable insulation layer. At the same time, the flexible fire-resistant buffer layer 451 has high temperature resistance and flame retardant properties, which can prevent high temperature from being directly conducted to the surface of the cable, further improving the overall fire-resistant and airtight effect after the gate 42 and the fixed seat 41 are closed.

[0025] Furthermore, the drive assembly 43 includes a fixed frame 431 fixedly installed on the outside of the metal channel 1 and located above the corresponding gate 42, a servo electric cylinder 432 fixedly installed on the fixed frame 431 for driving the gate 42 to rise and fall, and a through groove 433 opened on the metal channel 1 for guiding the gate 42 to slide. The servo electric cylinder 432 is connected to the output end of the control system, and the thermal release member 44 is fixedly connected to the piston rod of the servo electric cylinder 432 and the gate 42 respectively.

[0026] During normal operation, the servo cylinder 432 remains in the retracted state, raising the gate 42. The gate 42 slides along the through groove 433 and stops at the upper part of the metal channel 1, without obstructing cable passage. When the control system outputs a fire closure signal to the servo cylinder 432, the piston rod of the servo cylinder 432 extends downward. The piston rod, through the thermal release component 44, synchronously drives the gate 42 to slide vertically downward along the through groove 433 until the gate 42 engages with the fixed seat 41 to complete the channel blockage. The through groove 433 restricts the gate throughout the entire process. The 42-degree offset ensures a precise downward trajectory without deviation. If the high temperature of a fire burns the power supply line, causing the servo cylinder 432 to lose power and be unable to output thrust, the high temperature will heat the thermally sensitive release component 44 between the piston rod of the servo cylinder 432 and the gate 42, causing it to melt and disconnect. The servo cylinder 432 will no longer exert upward pulling constraint on the gate 42, and the gate 42 will slide down and close autonomously along the through groove 433 based on its own gravity, so as to ensure that the gate 42 can complete the fireproof isolation action under both power-on and power-off conditions.

[0027] Furthermore, the thermal release component 44 is a fusible alloy block 441, wherein the fusible alloy block 441 is teardrop-shaped, the tip of the fusible alloy block 441 is fixedly connected to the end of the piston rod of the servo electric cylinder 432, and the flat end of the fusible alloy block 441 is fixedly connected to the side of the gate 42 away from the fixed seat 41.

[0028] The fusible alloy block 441, with its inherent metallic strength, stably connects the piston rod of the servo cylinder 432 and the gate 42 under normal operating conditions. The pulling and pushing forces generated by the extension and retraction of the servo cylinder 432 can be smoothly transmitted to the gate 42 through the intact fusible alloy block 441, ensuring that the gate 42 moves synchronously and without loosening during normal electric control lifting and lowering. When a fire occurs inside the metal channel 1, generating high temperatures, the high temperature continuously bakes the fusible alloy block 441. The teardrop-shaped fusible alloy block 441, with its flat end attached to the gate 42, has a larger heat-receiving area and can quickly absorb the heat. Heat is conducted to the tip connection position. The tip has a smaller cross-sectional size and lower heat capacity, so it will reach the alloy melting temperature first and melt. After melting, the fusible alloy block 441 breaks the connection constraint between the piston rod of the servo cylinder 432 and the gate 42. The servo cylinder 432 can no longer pull the limit gate 42 upward. The gate 42, which is no longer restrained by the tension, can slide down along the through groove 433 and stick to the fixed seat 41 to complete the sealing. This ensures that the gate 42 can complete the bottom fireproof isolation by gravity when the electric control system fails.

[0029] Example 2 Unlike Example 1, as Figure 3 and Figure 4 As shown, in order to protect the detection components and ensure detection stability, the detection structure 3 also includes a protective shell 33 fixedly installed in the metal channel 1 and covering the outside of the corresponding temperature sensor 31 and smoke detector 32, a mesh 34 evenly distributed on the protective shell 33, and a moisture-absorbing material placed inside the protective shell 33. The temperature sensor 31 and the smoke detector 32 are both fixedly installed on the inner wall of the protective shell 33.

[0030] During normal operation of the underground space, the protective shell 33 can prevent large dust particles in the air from directly impacting and adhering to the surfaces of the temperature sensor 31 and the smoke detector 32, avoiding the reduction in detection sensitivity caused by dust blocking the component probes. The uniformly distributed mesh 34 on the outer wall of the protective shell 33 can maintain air communication between the inside of the protective shell 33 and the inside of the metal channel 1. Temperature airflow and smoke particles in the channel can pass through the mesh 34 and enter the inside of the protective shell 33 normally, ensuring that the temperature sensor 31 and the smoke detector 32 can collect environmental monitoring data in real time and accurately. At the same time, the moisture-absorbing material placed inside the protective shell 33 continuously absorbs the moisture that enters the cavity through the mesh 34, reducing the condensation of moisture in the metal channel 1 on the surfaces of the temperature sensor 31 and the smoke detector 32, preventing the components from short-circuiting and malfunctioning due to moisture. When a fire occurs inside the metal channel 1, generating high temperature and smoke, the high-temperature smoke passes through the mesh 34 of the protective shell 33 and enters the cavity. The temperature sensor 31 captures the temperature change in real time, and the smoke detector 32 senses the smoke concentration simultaneously.

[0031] It should be noted that the arc-shaped foam material 21 and the foam material curtain 22 are both expanded graphite-based flame-retardant foam materials or expandable fireproof silicone with a volume expansion ratio of not less than 20 times after heating. They are used to rapidly expand and fill all irregular gaps inside the metal channel 1 and at the port under high temperature in a fire. The flexible fire-resistant buffer layer 451 is a ceramic fiber felt or a flexible graphite composite gasket. It is used to elastically deform when the gate 42 and the fixed seat 41 surround and clamp the cable to adapt to the outer contour of the cable and eliminate contact gaps. The moisture-absorbing material is a granular silica gel desiccant or a molecular sieve adsorbent. It is used to adsorb the water vapor condensed inside the protective shell 33 to maintain the relative dryness of the environment where the temperature sensor 31 and the smoke detector 32 are located.

[0032] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. A fireproof sealing device for underground spaces, characterized in that: The system includes a control system, a metal channel (1) that runs through the wall and is fixedly connected to the wall for cables to pass through, a thermal expansion sealing layer (2) installed on the inner wall of the metal channel (1) for filling the metal channel (1) to seal and prevent fire when heated, a detection structure (3) installed on the inner wall of the metal channel (1) for detecting temperature and smoke concentration, and a barrier structure (4) installed at both ends of the metal channel (1) for blocking the path of smoke and fire at both ends of the metal channel (1). The barrier structure (4) includes a fixed base (41) fixedly installed at both ends of the metal channel (1) and located below the cable, a gate (42) set on the metal channel (1) and located above the corresponding fixed base (41) for isolating the opening and closing of the metal channel (1), a drive assembly (43) set on the metal channel (1) for driving the gate (42) to descend and close, and a thermal disconnector (44) set between the drive assembly (43) and the gate (42) for high-temperature melting to disconnect the gate (42) and the drive assembly (43). The detection structure (3) is connected to the input terminal of the control system, and the drive component (43) is connected to the output terminal of the control system.

2. The underground space fireproof sealing device according to claim 1, characterized in that: The thermal expansion sealing layer (2) includes an arc-shaped foam material (21) fixedly connected to the inner wall of the metal channel (1) and located at the upper and lower positions of the cable, and a foam material curtain (22) fixedly connected to the inner wall of the metal channel (1) near the two end outlets.

3. The underground space fireproof sealing device according to claim 1, characterized in that: The detection structure (3) includes a temperature sensor (31) disposed inside both ends of the metal channel (1) and a smoke detector (32) disposed on one side of the temperature sensor (31). Both the temperature sensor (31) and the smoke detector (32) are connected to the input terminal of the control system.

4. The underground space fireproof sealing device according to claim 3, characterized in that: The detection structure (3) further includes a protective shell (33) fixedly installed inside the metal channel (1) and covering the outside of the corresponding temperature sensor (31) and smoke detector (32), a mesh (34) evenly distributed on the protective shell (33), and a moisture-absorbing material placed inside the protective shell (33). The temperature sensor (31) and smoke detector (32) are both fixedly installed on the inner wall of the protective shell (33).

5. The underground space fireproof sealing device according to claim 1, characterized in that: The fixed base (41) and the gate (42) are provided with arc-shaped grooves (45) for cable to pass through on the side close to each other. The inner wall of the arc-shaped groove (45) is fixedly provided with a flexible fire-resistant buffer layer (451) for contact with the cable.

6. The underground space fireproof sealing device according to claim 1, characterized in that: The drive assembly (43) includes a fixed frame (431) fixedly installed on the outside of the metal channel (1) and located above the gate (42), a servo electric cylinder (432) fixedly installed on the fixed frame (431) for driving the gate (42) to rise and fall, and a through groove (433) opened on the metal channel (1) for guiding the gate (42) to slide. The servo electric cylinder (432) is connected to the output end of the control system. The thermal release component (44) is fixedly connected to the piston rod of the servo electric cylinder (432) and the gate (42) respectively.

7. The underground space fireproof sealing device according to claim 6, characterized in that: The heat-sensitive release element (44) is a fusible alloy block (441).

8. The underground space fireproof sealing device according to claim 7, characterized in that: The fusible alloy block (441) is teardrop-shaped. The tip of the fusible alloy block (441) is fixedly connected to the end of the piston rod of the servo electric cylinder (432). The flat end of the fusible alloy block (441) is fixedly connected to the side of the gate (42) away from the fixed seat (41).

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