Fireproof cable trench

Abstract

The invention relates to a fireproof cable trench, and relates to the technical field of cable trench fire extinguishment, the fireproof cable trench comprises a cable trench body, a plurality of equidistantly distributed laying plates are fixed on the inner walls of the left and right sides of the cable trench body, rectangular mounting ports are formed in the front surfaces of the laying plates on the left and right sides, and supporting rings are fixed in the mounting ports through supports; and a plurality of cable bodies are arranged in the supporting ring in a penetrating manner. According to the fireproof cable trench, based on the fire protection technology of the temperature sensing cable, the cable trench fire sensing capability is enhanced, so that the risk of fire occurrence is reduced, the non-planned power failure frequency caused by cable aging or other faults is reduced through an effective fire early warning and fire extinguishing system, the selected fire extinguishing agent and device can respond quickly, and the fire extinguishing efficiency is improved. The cable trench can effectively control and extinguish E-type live-line fire disasters and is suitable for A-type and B-type fire disasters, the laying plate and the supporting ring are arranged in the cable trench body, laying and fixing of the cable are facilitated, the temperature sensing cable surrounds the outer side of the cable, and effective detection is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of cable trench fire extinguishing, in particular to a fireproof cable trench. Background Art

[0002] A cable trench is an underground passage used for laying power or communication cables. It provides a safe and orderly way to lay cables, and can protect cables from external environmental factors such as weather and mechanical damage. Cable trench laying refers to a cable installation method in which cables are laid in a pre-built cable trench. The cable trench is generally made of concrete or brick structure, and its top is covered with a cover plate. The cover plate surface can be flush with the ground for easy opening. Some are slightly lower than the ground and a layer of cement is painted on the cover plate to prevent the cover plate from being uneven with the ground and rainwater from entering the cable trench. Depending on the number of cables laid, the cables can be placed in a single layer at the bottom of the cable trench, or in layers on the brackets of the cable trench.

[0003] 1. Current status of cable trench fire protection:

[0004] ① The space is long and narrow. A fire extinguishing unit (blocking interval) in the cable trench is generally long in horizontal direction (up to 25 meters), especially when there is a corner;

[0005] ② The cables are densely packed. The cable trench is a channel for laying cables, and the cables are densely packed inside. If the temperature of a certain section or a certain cable is abnormal, it is easy to cause the whole row to catch fire;

[0006] ③ Lack of monitoring and protection. Most cable trenches use fire-proof blocking materials to prevent fire and stop the spread, but lack fire-fighting products and linkage monitoring systems;

[0007] ④ The environment is bad. The cable trench is usually shielded by the cover plate, which has a certain water-blocking effect. However, the environment inside is usually humid, and it will also serve as a drainage channel during the rainy season, so general fire alarm devices are not suitable.

[0008] 2. Fire protection issues faced by cable trenches:

[0009] ① Abnormal grounding or short circuit of the cable, loose compaction of the cable joints, high load operation, overload, substandard cable quality, and cable damage can cause overheating and spontaneous combustion;

[0010] ② Cable aging leads to poor insulation and flame retardant effects, which can easily cause arcing and fire under overvoltage conditions. Usually, cable shafts have poor heat dissipation, which can easily lead to heat accumulation.

[0011] ③ Cable trench fires quickly, the fire is fierce and difficult to control. Cables generally catch fire in the form of deflagration, and even if the power is cut off, the fire is difficult to control.

[0012] ④ Since the main components of wires, cables and equipment are chemical products, most of them are easy to burn, and release toxic and harmful gases and thick smoke when burning, which is very harmful to the human body. The main cause of casualties in a fire is smoke.

[0013] ⑤The fire types in cable shafts are mainly Class E, which is a fire with electricity. Some of them also have the characteristics of Class A and Class B, which are solid material fires and fusible solid material fires. Under normal circumstances, it is not suitable to use water to extinguish the fire.

[0014] In Chinese patent CN116212274A, a cable trench fire extinguishing device is disclosed, which includes a fire wall and a fire extinguishing mechanism arranged inside the cable trench body, wherein the fire wall is installed at the bottom of the inner cavity of the cable trench body; the fire extinguishing mechanism includes an electric slide, a connecting frame, a controller, a mounting seat and a fire extinguishing ball, wherein the electric slide is installed through the middle of the fire wall and the moving end moves in the up and down direction, two connecting frames are respectively installed on both sides of the moving end of the electric slide, and are correspondingly located on both sides of the fire wall, and two mounting seats are correspondingly installed at both ends of the connecting frame, wherein the fire extinguishing ball is arranged at the bottom of the mounting seat, and the fire extinguishing ball stores fire extinguishing agent inside; the fire extinguishing mechanism also includes a detection spraying assembly, which is arranged at the bottom of the fire extinguishing ball, and is used for fire detection, and spraying fire extinguishing agent to extinguish fire when fire is detected. The invention has inclined direct spraying fire extinguishing, and the height position of the fire extinguishing ball can also be adjusted, so as to achieve accurate spraying fire extinguishing work and ensure the maximum use of fire extinguishing agent.

[0015] Although the above application solves some of the safety issues faced by cable trenches, the above application uses traditional smoke sensors for fire detection. However, for detectors, the indoor environment is relatively friendly, and the main interference is dust, insects, ants, moisture, etc., while the main interference faced outdoors is humidity and heat, especially in summer. Therefore, conventional point-type temperature-sensing smoke, flame infrared and other detectors are not suitable for cable trench scenarios. At the same time, cable trenches catch fire quickly, the fire is fierce, and it is difficult to control. Cables generally catch fire in the form of deflagration. Even if the power is off, the fire is difficult to control. The above application does not have timely blocking measures. When the sensor response is too slow, it is easy to cause the fire to spread. Summary of the invention

[0016] In view of the shortcomings of the prior art, the present invention provides a fireproof cable trench, which has the advantages of timely and accurate fire extinguishing, etc., and solves the problem that conventional point-type temperature and smoke detectors, flame infrared detectors and the like are not suitable for cable trench scenes, and that cable trenches catch fire quickly, the fire is fierce and difficult to control.

[0017] To achieve the above object, the present invention provides the following technical solutions: a fireproof cable trench, comprising a cable trench body, a plurality of equally spaced laying plates are fixed to the inner walls on both sides of the cable trench body, a rectangular installation opening is opened on the front of the laying plates on both sides, a support ring is fixed in each installation opening via a bracket, and a plurality of cable bodies are placed through the support ring;

[0018] Among them, a fire extinguishing mechanism for extinguishing a fire on the cable body is arranged inside the cable trench body, and two blocking plates are fixed inside the cable trench body, which are distributed on the front and rear sides and are in a close contact with the foundation, and a blocking mechanism for blocking the cable trench body space is arranged on the laying plate;

[0019] The fire extinguishing mechanism includes two fire extinguishing pipes, multiple support seats, two temperature-sensing cables, a supplementary tank, an electric high-pressure pump, two electric valves, multiple electric spray heads A, and a three-way pipe. A connection port through which the fire extinguishing pipe passes is provided on the front of each of the laying boards. The fire extinguishing pipes on the left and right sides are both located in the connection ports on both sides. Multiple support seats are linearly fixed to the bottom wall of the cable trench body by bolts and are located on the same straight line as the connection ports. The fire extinguishing pipe is supported by the support seats. The two temperature-sensing cables are respectively located in the two installation ports. Multiple cable bodies surround the outer sides of the temperature-sensing cables and wrap them in a close-fitting manner. A placement groove for accommodating the supplementary tank is provided in the foundation. The electric high-pressure pump is fixed to the upper surface of the supplementary tank. The liquid inlet end of the electric high-pressure pump is connected to the supplementary tank. The water outlet end of the electric high-pressure pump is connected to the two fire extinguishing pipes through the three-way pipe. Two electric valves are set at the connection between the two fire extinguishing pipes and the three-way pipe. Multiple electric spray heads A are equidistantly connected and fixed to the upper surface of the fire extinguishing pipe.

[0020] Furthermore, the replenishing tank is filled with perfluorohexanone liquid, and the multiple electric spray heads A are all facing the direction of the cable body and are located on the same vertical line.

[0021] Furthermore, the cable trench body and the placement groove are both provided with sealing covers, and the inner bottom wall of the cable trench body is provided with a plurality of drainage holes.

[0022] Furthermore, the laying plate includes a solid plate and a hollow plate, the solid plate is in a U-shape, the hollow plate is fixed inside the solid plate, the installation port is opened on the hollow plate, and installation plates are fixed on the front and rear sides of the solid plate and close to the inner wall of the cable trench body, and the laying plate is fixed to the cable trench body via the installation plates.

[0023] Furthermore, the sealing mechanism includes a sealing box fixed on the upper surface of the laying board, a small motor fixed inside the left sealing box, a heat-insulating roller fixed outside the output shaft of the small motor, a baffle fixed on the upper side of the heat-insulating roller, a fire-blocking cloth fixed on the lower side of the heat-insulating roller, and a counterweight bar fixed on the side of the fire-blocking cloth away from the heat-insulating roller. The right end of the heat-insulating roller passes through and extends to the interior of the right sealing box and is rotatably connected thereto via a bearing. The length of the sealing box is equal to the length of the laying board.

[0024] Furthermore, the width of the sealing boxes on the left and right sides is greater than the width of the laying board, the inner bottom wall of the cable trench body is provided with a rectangular water trough filled with water, and the counterweight bar faces the direction of the water trough.

[0025] Furthermore, the fire-blocking cloth is made of glass fiber, and the baffle gap is fitted between the sealing boxes on the left and right sides.

[0026] Furthermore, the blocking mechanism also includes a connecting pipe fixed between each laying plate, an air storage box is placed inside the cable trench body, and an air pump is fixed on the upper surface of the air storage box.

[0027] Furthermore, the connecting pipe is connected between two adjacent hollow plates and is linearly and equidistantly distributed. The air inlet end of the air pump is connected to the air storage box, and the air outlet end of the air pump is connected to the connecting pipe.

[0028] Furthermore, a plurality of equally spaced electrospray heads B are fixed to the inner top wall and the inner bottom wall of the installation opening, and the electrospray heads B face the direction of the cable body.

[0029] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0030] This fireproof cable trench is based on the fire-fighting technology of temperature-sensing cables, which enhances the perception of cable trench fires, thereby reducing the risk of fire. Through an effective fire warning and fire-fighting system, the number of unplanned power outages caused by cable aging or other faults is reduced. The selected fire extinguishing agent and device can respond quickly, effectively control and extinguish Class E live fires, and is also suitable for Class A and Class B fires. A laying plate and a support ring are provided inside the cable trench body to facilitate the laying and fixing of the cable. At the same time, the temperature-sensing cable is wrapped around the outside of the cable to achieve effective detection. The sealing mechanism includes a sealing box, a small motor, a heat-insulating roller, a baffle, a fire-blocking cloth and a counterweight bar, which can effectively block the fire source and prevent the fire from spreading. The fire-extinguishing device integrates multiple functions such as temperature detection, fire-extinguishing agent storage and injection, simplifies the system structure, and improves the fire-fighting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the present invention;

[0032] Figure 2It is a schematic diagram of the fire extinguishing mechanism of the present invention;

[0033] Figure 3 It is a schematic diagram of a partial top view of the structure of the present invention;

[0034] Figure 4 Schematic diagram of the partial structure of the blocking mechanism of the present invention

[0035] Figure 5 This is a topological diagram of the system of the present invention.

[0036] In the figure: 1 cable trench body, 2 laying plate, 3 installation port, 4 support ring, 5 cable body, 6 fire extinguishing mechanism, 61 fire extinguishing pipe, 62 support seat, 63 temperature sensing cable, 64 supplementary tank, 65 electric high-pressure pump, 66 electric valve, 67 electric nozzle A, 68 three-way pipe, 7 blocking plate, 8 blocking mechanism, 81 sealing box, 82 small motor, 83 insulation roller, 84 baffle, 85 fire-blocking cloth, 86 counterweight strip, 87 connecting pipe, 88 air storage box, 89 air pump, 810 electric nozzle B. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] See also Figure 1-5 In this embodiment, a fireproof cable trench comprises a cable trench body 1, a plurality of equally spaced laying plates 2 are fixed to the inner walls on both sides of the cable trench body 1, a rectangular installation opening 3 is opened on the front of the laying plates 2 on both sides of the left and right sides, a support ring 4 is fixed in the installation opening 3 through a bracket, and a plurality of cable bodies 5 are placed through the support ring 4;

[0039] The cable trench body 1 is provided with a fire extinguishing mechanism 6 for extinguishing the cable body 5, and the cable trench body 1 is provided with two sealing plates 7 distributed on the front and rear sides and in a close contact with the foundation, and the laying plate 2 is provided with a sealing mechanism 8 for sealing the space of the cable trench body 1;

[0040] The fire extinguishing mechanism 6 includes two fire extinguishing pipes 61, multiple support seats 62, two temperature sensing cables 63, a supplementary tank 64, an electric high-pressure pump 65, two electric valves 66, multiple electric nozzles A67, and a three-way pipe 68. The front of each laying board 2 is provided with a connection port through which the fire extinguishing pipe 61 passes. The fire extinguishing pipes 61 on the left and right sides are both located in the connection ports on both sides. The multiple support seats 62 are fixed to the bottom wall of the cable trench body 1 in a linear shape by bolts and are located on the same straight line as the connection ports. The fire extinguishing pipe 61 is supported by the support seats 62. The two temperature sensing cables 63 are respectively located at the two In the installation opening 3, multiple cable bodies 5 surround the outer side of the temperature sensing cable 63 and wrap it in a close-fitting shape. A connecting plate is opened in the foundation to accommodate a placement groove for the supplementary tank 64. The electric high-pressure pump 65 is fixed to the upper surface of the supplementary tank 64. The liquid inlet end of the electric high-pressure pump 65 is connected to the supplementary tank 64. The water outlet end of the electric high-pressure pump 65 is connected to the two fire extinguishing pipes 61 through a three-way pipe 68, and two electric valves 66 are mounted at the connection between the two fire extinguishing pipes 61 and the three-way pipe 68. Multiple electric spray heads A67 are equidistantly connected and fixed to the upper surface of the fire extinguishing pipe 61.

[0041] It should be noted that the fire extinguishing pipe 61 is a channel for conveying the fire extinguishing agent, which runs through the connection port opened on the front of the laying board 2, with one on each side, responsible for conveying the fire extinguishing agent from the supplementary tank 64 to the electric spray head A67. The supplementary tank 64 contains a fire extinguishing agent (such as perfluorohexanone liquid) and is provided with a placement groove, which is fixed inside to provide a source of fire extinguishing agent for the fire extinguishing system. The electric spray head A67 is equidistantly fixed on the upper surface of the fire extinguishing pipe 61, facing the cable body 5, and is responsible for spraying the fire extinguishing agent when a fire is detected.

[0042] It can be understood that the design of the entire fire extinguishing mechanism 6 is aimed at achieving rapid response and accurate fire extinguishing to fires in cable trenches. The temperature sensing cable 63 serves as an early warning system, which can detect temperature anomalies and trigger an alarm at the early stage of a fire. Once a fire signal is detected, the electric high-pressure pump 65 is started, and the fire extinguishing agent is transported to the fire extinguishing pipe 61 through the three-way pipe 68, and the electric nozzle A67 is directly aimed at the fire source for fire extinguishing. At the same time, the support seat 62 ensures the stability of the fire extinguishing pipe 61, the replenishing tank 64 ensures the supply of fire extinguishing agent, and the electric valve 66 controls the flow direction of the fire extinguishing agent to ensure the effectiveness and accuracy of the fire extinguishing process.

[0043] The replenishing tank 64 is filled with perfluorohexanone liquid, and the multiple electric spray heads A67 are all facing the direction of the cable body 5 and are located on the same vertical line.

[0044] It should be noted that the electric spray heads A67 are evenly fixed on the upper surface of the fire extinguishing pipe 61 and face the direction of the cable body 5. The electric spray heads A67 are designed to be located on the same vertical line to ensure that the fire extinguishing agent can evenly cover the cable body 5 in the cable trench to achieve effective fire extinguishing. When the temperature sensing cable 63 detects a fire signal, the electric spray heads A67 will start and spray the perfluorohexanone liquid in the replenishment tank 64 in the form of atomization to quickly cover the fire source and suppress the spread of the fire.

[0045] The cable trench body 1 and the placement groove are both provided with sealing covers, and the inner bottom wall of the cable trench body 1 is provided with a plurality of drainage holes.

[0046] It should be noted that the sealing cover plate is used to cover the cable trench body 1 and the placement groove to prevent garbage from entering therein and affecting the normal operation of the entire device.

[0047] Among them, the laying plate 2 includes a solid plate and a hollow plate. The solid plate is in a U-shape, the hollow plate is fixed inside the solid plate, the installation port 3 is opened on the hollow plate, and installation plates are fixed on the front and back sides of the solid plate and close to the inner wall of the cable trench body 1. The laying plate 2 is fixed to the cable trench body 1 through the installation plates.

[0048] Through this design, the laying board 2 not only provides a stable and orderly laying space for the cables, but also facilitates the arrangement of the fire extinguishing pipe 61 and other components through the setting of the installation port 3, thereby improving the installation efficiency and reliability of the entire fire extinguishing system. At the same time, the structural design of the solid board and the hollow board also helps to improve the overall fire prevention and fire retardant performance.

[0049] Among them, the sealing mechanism 8 includes a sealing box 81 fixed on the upper surface of the laying board 2, a small motor 82 fixed inside the left sealing box 81, an insulation roller 83 fixed outside the output shaft of the small motor 82, a baffle 84 fixed on the upper side of the insulation roller 83, a fire-blocking cloth 85 fixed on the lower side of the insulation roller 83, and a counterweight bar 86 fixed on the side of the fire-blocking cloth 85 away from the insulation roller 83. The right end of the insulation roller 83 passes through and extends to the interior of the right sealing box 81 and is rotatably connected thereto via a bearing. The length of the sealing box 81 is equal to the length of the laying board 2.

[0050] The sealing mechanism 8 is designed to respond quickly when a fire occurs. The heat-insulating roller 83 driven by a motor drives the baffle 84 and the fire-blocking cloth 85 to unfold, forming a fire barrier, effectively preventing the spread of fire and heat, and protecting the cables in the cable trench from fire damage. At the same time, the use of the counterweight bar 86 enhances the sealing effect, ensures that the fire-blocking cloth 85 can fit tightly to the trench body, and improves the reliability of fire-proof sealing.

[0051] The width of the sealing boxes 81 on the left and right sides is greater than the width of the laying board 2, and a rectangular water trough is provided on the inner bottom wall of the cable trench body 1, and the inside of the water trough is filled with water, and the counterweight bar 86 faces the direction of the water trough.

[0052] The fire-blocking cloth 85 is made of glass fiber, and the baffle 84 is gap-fitted between the left and right sealing boxes 81 .

[0053] Through these designs, the blocking mechanism 8 can quickly form an effective fire barrier when a fire occurs, and the heat insulation roller 83, the fire-blocking cloth 85, the weight bar 86 and the water in the water tank work together to improve the fire prevention ability of the cable trench and protect the cables from fire damage. In addition, the size design of the sealing box 81 and the setting of the water tank increase the sealing and thermal stability of the blocking mechanism 8, providing a more reliable safety guarantee for the cable trench.

[0054] The blocking mechanism 8 further includes a connecting pipe 87 fixed between the laying boards 2 , an air storage box 88 is placed inside the cable trench body 1 , and an air pump 89 is fixed on the upper surface of the air storage box 88 .

[0055] The gas storage box 88 is arranged inside the cable trench body 1 and is used to store gas, such as carbon dioxide or other inert gases, which can be used to extinguish or suppress fire in case of fire. The air pump 89 is installed on the upper surface of the gas storage box 88. The air inlet end of the air pump 89 is connected to the gas storage box 88 and is used to inject or extract gas into or out of the gas storage box 88 to control the pressure and capacity of the gas. The air outlet end of the air pump 89 is connected to the connecting pipe 87 to ensure that the gas can be quickly transported to the required place when needed.

[0056] Among them, the connecting pipe 87 is connected between two adjacent hollow plates and is evenly distributed in a linear shape. The air inlet end of the air pump 89 is connected to the air storage box 88, and the air outlet end of the air pump 89 is connected to the connecting pipe 87.

[0057] The connecting pipes 87 are fixed between the laying boards 2 to connect the various parts to ensure the integrity and sealing of the sealing mechanism 8. These connecting pipes 87 are linearly and equidistantly distributed between adjacent hollow boards, which helps to form a continuous sealing structure between the laying boards 2.

[0058] This design provides a combined mechanical and pneumatic blocking solution that can respond quickly when a fire occurs. By combining physical barriers and gas suppression, it can effectively control and limit the spread of fire and protect the safety of cables in the cable trench.

[0059] Among them, a plurality of equally spaced electric spray heads B810 are fixed to the inner top wall and the inner bottom wall of the installation opening 3 , and the electric spray heads B810 face the direction of the cable body 5 .

[0060] Finally, the A67 electrospray nozzle:

[0061] Position and function: The electric spray nozzles A67 are evenly distributed on the upper surface of the fire extinguishing pipe 61, facing the cable body 5, and located on the same vertical line.

[0062] Working principle: When the temperature sensing cable 63 detects abnormal cable temperature or a fire occurs, the electric spray head A67 will start to spray the fire extinguishing agent (such as perfluorohexanone liquid) stored in the supplementary tank 64 in the form of mist or fine stream, directly aiming at the fire source or potential fire point for fire extinguishing.

[0063] Precise fire extinguishing: The design of the electric sprinkler head A67 ensures that the fire extinguishing agent can accurately cover the area where the fire occurs, reducing the waste of fire extinguishing agent and improving the fire extinguishing efficiency.

[0064] Electric spray nozzle B810:

[0065] Position and function: The electric spray head B810 is fixed on the inner top wall and inner bottom wall of the installation opening 3, facing the cable body 5.

[0066] Working principle: The electric sprinkler B810 is used to generate high-speed airflow when a fire occurs, forming an air wall to prevent the fire from spreading to other areas through the installation port 3.

[0067] Airflow fire-blocking: Under the action of the air pump 89, the gas in the air storage box 88 is transported to the electric spray head B810 through the connecting pipe 87, and is quickly sprayed out to form airflow fire-blocking, thereby enhancing the fire extinguishing effect.

[0068] Electric high pressure pump 65:

[0069] Position and function: The electric high-pressure pump 65 is installed on the upper surface of the supplementary tank 64 and is fixed to the supplementary tank 64 .

[0070] Working principle: The electric high-pressure pump 65 draws the fire extinguishing agent from the supplementary tank 64, transports the fire extinguishing agent to the fire extinguishing pipe 61 through the three-way pipe 68, and then distributes it to each electric nozzle A67.

[0071] Efficient fire extinguishing: The working principle of the electric high-pressure pump 65 ensures that the fire extinguishing agent can be quickly and evenly delivered to the area where the fire needs to be extinguished, improving the fire extinguishing response speed and fire extinguishing effect.

[0072] Perfluorohexanone is a colorless, odorless, transparent, insulating liquid with high fire extinguishing efficiency, no damage to equipment, and environmental friendliness.

[0073] It should be noted that the non-storage type perfluorohexanone fire extinguishing module of the present application has the advantage of being maintenance-free; the perfluorohexanone fire extinguishing agent is a new type of environmentally friendly, colorless, non-toxic fire extinguishing agent, the boiling point of the fire extinguishing agent under standard atmospheric pressure is 49.2°C, the freezing point is -108°C, the dielectric strength is ≥110kV, and its insulation is extremely high. The fire extinguishing agent is in liquid form at room temperature, which greatly improves the storage, transportation and use performance of the fire extinguishing agent. There is no need to worry about the agent causing harm to the human body. The fire extinguishing agent is quickly converted into a gaseous state after being sprayed out from the nozzle, and no residual traces are left after volatilization. It is non-toxic and harmless to the human body. The ODP ozone layer depletion potential is 0, the GWP greenhouse effect is 1, the ALT survival life in the atmosphere is 0.014 years (5 days), and the fire extinguishing concentration is 4-6%. It is an excellent substitute for halon and HFCs fire extinguishing agents;

[0074] The specific formula is:

[0075] ,

[0076] in,

[0077] W-designed amount of perfluorohexanone fire extinguishing agent for fire extinguishing or inerting in the protection area (kg);

[0078] C1-fire extinguishing design concentration or inerting design concentration (%);

[0079] S-specific volume of superheated vapor of fire extinguishing agent at 101kPa and the lowest ambient temperature of the protection area (m / kg);

[0080] V-net volume of the protection zone (m);

[0081] K- Altitude correction factor, the value shall be taken as specified in Appendix B.

[0082] The implementation scheme of this application is:

[0083] (1) Select a typical cable channel, draw a cable trench layout diagram based on on-site exploration, calculate the cubic volume of the cable trench space, clarify the number of cable layout layers in the cable trench and the fire blocking settings, and calculate the fire extinguishing dosage based on the theoretical value.

[0084] (2) According to the actual situation of the cable trench, draw out the pipeline system and fire-blocking system for arranging the fire-extinguishing device to meet the requirements of fire-blocking, rapid release and uniform dispersion;

[0085] (3) Select cable-type linear fire detectors with appropriate temperature value (105°C) to detect fire signals. Arrange two detectors of different specifications in each partition, and lay out two alternating sine waves. When two detectors alarm at the same time, all fire extinguishing devices in the partition will be activated in conjunction.

[0086] (4) Each temperature sensing cable host is connected to two input modules (alarm and fault) and each fire extinguishing device is connected to an input and output module (start and feedback). The detected alarm signal is connected to the original auxiliary equipment monitoring system for unified monitoring and management. When a fire occurs, the fire protection system sends a dry contact signal to the background system through the corresponding module, one way for each partition.

[0087] At the same time, the electrospray nozzle A67 and the electrospray nozzle B810 both belong to the prior art and are controlled by the main controller of the present application, and their specific working principles will not be described in detail.

[0088] It can be understood that the electrical components appearing in the text are all electrically connected to the main controller and the power supply and the electrical components appearing in the text are all conventionally known devices, and this application will not go into too much detail. The main controller can be a conventionally known device that controls a computer, etc. The control circuit of the main controller can be realized by simple programming by technicians in this field. The provision of power is also common knowledge in this field, and the present invention is mainly used to protect mechanical devices, so the present invention will not explain the control method and circuit connection in detail. At the same time, the parts not described in detail in the present invention are all known technologies to those skilled in the art.

[0089] The working principle of the above embodiment is:

[0090] Since the temperature sensing cable 63 is wrapped by the cable body 5, any small temperature change can be detected, which is suitable for early fire detection and can also avoid being affected by the external environment. If the cable temperature rises and a fire is about to occur, the fire extinguishing mechanism 6 is used to extinguish the cable body 5. The electric high-pressure pump 65 on the supplementary tank 64 works to allow the perfluorohexanone stored inside to enter the fire extinguishing pipes 61 on both sides through the three-way pipe 68, avoiding the use of a pressure storage design. When the perfluorohexanone in the supplementary tank 64 is discharged when a fire occurs, it is slower than directly replenishing it in the fire extinguishing pipe 61 in advance. Therefore, when a fire occurs, the location of the fire is detected by the temperature sensing cable 63, and the corresponding electric spray head A67 is opened to perform precise fire extinguishing, avoiding the waste of perfluorohexanone caused by the opening of other electric spray heads A67;

[0091] At the same time, in order to prevent the spread of fire, when the temperature sensing cable 63 detects that the temperature of the cable body 5 has changed, multiple small motors 82 are used to work to unwind the weight strip 86 and the fire-blocking cloth 85 until the weight strip 86 enters the water tank in the cable trench body 1. When the weight strip contacts the water in the water tank, the sealing effect can be effectively improved compared to the contact between the bracket and the bottom wall of the cable trench body 1. At the same time, the baffle 84 is used to fill the gap between the cover plate of the cable trench body 1 and the distance between the two laying plates 2 is blocked, and the cable body 5 and the temperature sensing cable 63 are sealed. 63 is located in the gap at the installation port 3, and the airflow generated by the electric nozzle B810 is used to form an air wall in the installation port 3, so that an airflow fire barrier is formed at the installation port 3, and when the air pump 89 is running, the gas in the air storage box 88 quickly enters the connecting pipe 87 to form a high-speed airflow. At this time, the stored carbon dioxide will be quickly sprayed out of the electric nozzle B810 to complete the airflow fire barrier. At this time, the cable trench body 1 forms a plurality of relatively closed spaces through a plurality of laying plates 2, which can not only prevent the spread of fire, but also improve the fire extinguishing effect of perfluorohexanone to a certain extent.

[0092] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0093] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A fireproof cable trench, comprising a cable trench body (1), characterized in that: A plurality of equally spaced laying plates (2) are fixed to the inner walls on both sides of the cable trench body (1); rectangular installation openings (3) are provided on the front sides of the laying plates (2) on both sides; support rings (4) are fixed in the installation openings (3) via brackets; and a plurality of cable bodies (5) are placed through the support rings (4); The cable trench body (1) is provided with a fire extinguishing mechanism (6) for extinguishing a fire on the cable body (5); two sealing plates (7) are fixed to the cable trench body (1) and are distributed on the front and rear sides and are in contact with the foundation; and the laying plate (2) is provided with a sealing mechanism (8) for sealing the space of the cable trench body (1); The fire extinguishing mechanism (6) comprises two fire extinguishing pipes (61), a plurality of support seats (62), two temperature sensing cables (63), a supplementary tank (64), an electric high-pressure pump (65), two electric valves (66), a plurality of electric spray heads A (67), and a three-way pipe (68). The front side of each of the laying boards (2) is provided with a connection port through which the fire extinguishing pipe (61) passes. The fire extinguishing pipes (61) on the left and right sides are both located in the connection ports on both sides. The plurality of support seats (62) are linearly fixed to the bottom wall of the cable trench body (1) by bolts and are located on the same straight line as the connection ports. The fire extinguishing pipe (61) is supported by the support seats (62). The two temperature sensing cables (63) are respectively located In the two installation openings (3), a plurality of cable bodies (5) surround the outer side of the temperature sensing cable (63) and wrap it in a close-fitting manner. A connection plate is provided in the foundation for accommodating a placement groove for a supplementary tank (64). The electric high-pressure pump (65) is fixed to the upper surface of the supplementary tank (64). The liquid inlet end of the electric high-pressure pump (65) is connected to the supplementary tank (64). The water outlet end of the electric high-pressure pump (65) is connected to the two fire extinguishing pipes (61) via a three-way pipe (68). Two electric valves (66) are sleeved at the connection between the two fire extinguishing pipes (61) and the three-way pipe (68). A plurality of electric spray heads A (67) are equidistantly connected and fixed to the upper surface of the fire extinguishing pipe (61).

2. A fireproof cable trench according to claim 1, characterized in that: The replenishing tank (64) is filled with perfluorohexanone liquid, and the plurality of electric spray heads A (67) are all facing the direction of the cable body (5) and are located on the same vertical line.

3. A fireproof cable trench according to claim 1, characterized in that: The cable trench body (1) and the placement groove are both provided with sealing covers, and the inner bottom wall of the cable trench body (1) is provided with a plurality of drainage holes.

4. A fireproof cable trench according to claim 1, characterized in that: The laying plate (2) comprises a solid plate and a hollow plate, the solid plate is in a U-shape, the hollow plate is fixed inside the solid plate, the installation opening (3) is opened on the hollow plate, and installation plates are fixed on the front and rear sides of the solid plate and close to the inner wall of the cable trench body (1), and the laying plate (2) is fixed to the cable trench body (1) via the installation plates.

5. A fireproof cable trench according to claim 1, characterized in that: The blocking mechanism (8) comprises a sealing box (81) fixed to the upper surface of the laying board (2), a small motor (82) fixed inside the left sealing box (81), a heat-insulating roller (83) fixed outside the output shaft of the small motor (82), a baffle (84) fixed on the upper side of the heat-insulating roller (83), a fire-blocking cloth (85) fixed on the lower side of the heat-insulating roller (83), and a weight bar (86) fixed on the side of the fire-blocking cloth (85) away from the heat-insulating roller (83). The right end of the heat-insulating roller (83) passes through and extends into the inside of the right sealing box (81) and is rotatably connected thereto via a bearing. The length of the sealing box (81) is equal to the length of the laying board (2).

6. A fireproof cable trench according to claim 5, characterized in that: The widths of the sealing boxes (81) on the left and right sides are both greater than the width of the laying board (2); the inner bottom wall of the cable trench body (1) is provided with a rectangular water trough filled with water; and the counterweight bar (86) faces the direction of the water trough.

7. A fireproof cable trench according to claim 5, characterized in that: The fire-blocking cloth (85) is made of glass fiber, and the baffle (84) is gap-fitted between the sealing boxes (81) on the left and right sides.

8. A fireproof cable trench according to claim 1, characterized in that: The blocking mechanism (8) further comprises a connecting pipe (87) fixed between the laying boards (2); an air storage box (88) is placed inside the cable trench body (1); and an air pump (89) is fixed on the upper surface of the air storage box (88).

9. A fireproof cable trench according to claim 8, characterized in that: The connecting pipes (87) are connected between two adjacent hollow plates and are linearly and equidistantly distributed. The air inlet end of the air pump (89) is connected to the air storage box (88), and the air outlet end of the air pump (89) is connected to the connecting pipe (87).

10. A fireproof cable trench according to claim 1, characterized in that: A plurality of equally spaced electric spray heads B (810) are fixed to the inner top wall and the inner bottom wall of the installation opening (3), and the electric spray heads B (810) face the direction of the cable body (5).

Images