A cable trench fire suppression control system
By using nitrogen-driven carbon dioxide cylinders and an electrical control system, combined with smoke and temperature sensors, fire suppression can be initiated automatically or manually, solving the problems of difficult detection of cable trench fires and the complexity of existing systems, thus achieving rapid and safe fire suppression in cable trenches.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUAFENG ALUMINUM CO LTD
- Filing Date
- 2025-03-31
- Publication Date
- 2026-06-19
AI Technical Summary
Fires in cable trenches are difficult to detect, harmful gases are produced in the early stages of a fire, and complex terrain is not conducive to firefighting. Existing fire extinguishing systems are complex and require professional operation, while manual inspection consumes a lot of manpower and resources.
Employing nitrogen-driven carbon dioxide cylinder arrays and an electrical control system, combined with smoke and temperature sensors, the system can automatically or manually activate fire suppression, simplifying operation and enabling rapid response to cable trench fires.
It enables rapid and safe fire suppression in cable trenches, reduces manpower and material consumption, avoids equipment damage and short circuit risks, and is suitable for electrical fires.
Smart Images
Figure CN224370512U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fire extinguishing technology, and in particular to a fire extinguishing control system for cable trenches. Background Technology
[0002] Cable trenches can effectively protect cables from damage caused by the external environment, such as mechanical forces and corrosion. By placing cables in enclosed cable trenches, physical damage to the cables can be prevented, extending their service life.
[0003] However, cables are located in enclosed spaces, and as the load changes and the current increases, the temperature rises, which accelerates the aging of the insulation. After prolonged use, the insulation will break down and cause a circuit fire. Because cables are in enclosed spaces, fires are difficult to detect in their early stages. When a fire occurs, it will also produce a large amount of harmful gases, causing injury to personnel. Moreover, the complex terrain makes fire fighting difficult. Equipping the cables with a fire extinguishing system is an effective fire extinguishing measure. Currently, the factory still conducts daily manual temperature inspections of the cable trenches to analyze the operating status based on temperature changes and prevent accidents, which consumes a lot of manpower.
[0004] The main fire prevention measures for cable trenches include: fireproofing the cable trenches, cable trays, and cable interlayers to prevent a single or small number of cables from igniting a large number of cables; constructing firewalls at intervals along the cable trenches to prevent the fire from spreading further; these are all fire prevention measures, but no fire extinguishing methods; some companies invest heavily in equipping non-pressurized perfluorohexanone gas fire extinguishing controllers, but the control system is complex and requires professional knowledge and skills to operate and maintain correctly, placing high demands on operators and maintenance personnel. Summary of the Invention
[0005] The purpose of this invention is to provide a fire extinguishing control system for cable trenches.
[0006] To achieve the above objectives, the technical solution of this utility model is as follows:
[0007] A fire extinguishing control system for cable trenches includes a nitrogen-driven cylinder, a carbon dioxide cylinder group, a carbon dioxide pipeline, and an electrical control system. The carbon dioxide cylinder group is located inside the cable trench and includes several high-pressure carbon dioxide cylinders. Each high-pressure carbon dioxide cylinder has a pneumatic level valve at its upper end. The pneumatic level valves are connected in series. The output end of the nitrogen-driven cylinder is connected to the input end of the pneumatic level valve through a nitrogen-driven pipeline. The output end of the nitrogen-driven cylinder is equipped with a nitrogen-driven manual valve and a nitrogen-driven solenoid valve. The output end of the pneumatic level valve is connected to the carbon dioxide pipeline through a pipeline. The carbon dioxide pipeline runs across the top of the cable trench and has evenly distributed air holes.
[0008] The electrical control system includes a UPS, a DC power module, a smoke sensor, a temperature sensor, a smoke alarm, and a temperature alarm. The UPS is powered by 220V AC mains and supplies power to the DC power module, which converts the 220V AC mains power into 24V DC to power the smoke alarm and temperature sensor.
[0009] A plurality of normally open contacts of the smoke sensors are connected in parallel and then in series with a smoke alarm; a plurality of normally open contacts of the temperature sensors are connected in parallel and then in series with a temperature alarm; the normally open contacts of the smoke sensors are connected in parallel with the normally open contacts of the smoke alarm relay and the normally open contacts of the smoke sensing test button; the normally open contacts of the temperature sensors are connected in parallel with the normally open contacts of the temperature alarm relay and the normally open contacts of the temperature sensing test button; the normally open contacts of the smoke alarm relay and the normally open contacts of the temperature alarm relay are connected in series and then in parallel with the normally open contacts of the fire alarm relay; the normally open contacts of the fire alarm relay are connected in series with a nitrogen-driven solenoid valve; and the nitrogen-driven solenoid valve is connected in parallel with the fire alarm.
[0010] The normally open contact of the fire alarm relay is connected in parallel with the manual fire extinguishing button.
[0011] Furthermore, the electrical control system includes a first smoke sensor, a second smoke sensor, a first temperature sensor, and a second temperature sensor. The normally open contacts of the first smoke sensor and the second smoke sensor are connected in parallel with the normally open contacts of the smoke sensing test button and the smoke alarm relay. The normally open contacts of the first temperature sensor and the second temperature sensor are connected in parallel with the normally open contacts of the temperature sensing test button and the temperature alarm relay.
[0012] Furthermore, the normally open contacts of the smoke alarm relay, temperature alarm relay, and fire alarm relay are all connected to a reset button.
[0013] Furthermore, the output terminal of the DC power module is equipped with a circuit breaker.
[0014] This utility model adopts a carbon dioxide high-pressure cylinder fire extinguishing system, which has a fast response speed, a cooling effect, is suitable for electrical fires, and will not cause short circuits or equipment damage.
[0015] This utility model's nitrogen-driven cylinder has both manual and electric start control functions. It combines a smoke detector, a temperature sensor, and a fire alarm to determine whether the cable trench is experiencing abnormal smoke, abnormal temperature, or a fire. Only in the event of a fire will the nitrogen be electrically activated to extinguish the fire through a high-pressure carbon dioxide cylinder group, saving manpower and material resources. Attached Figure Description
[0016] Figure 1 This is a system structure diagram of the present invention;
[0017] Figure 2 The electrical control diagram for the normally open contacts of a smoke detector and a temperature sensor is shown in the example.
[0018] Figure 3 This is an example of an electrical control diagram for a fire alarm system;
[0019] Figure 4 The electrical control flowchart is shown in the example.
[0020] Figure label:
[0021] 1. Cable trench; 2. Nitrogen drive cylinder; 3. Carbon dioxide pipeline; 4. Carbon dioxide high-pressure cylinder.
[0022] 5. Nitrogen-driven pipeline; 6. Pneumatic level valve; 7. Nitrogen-driven manual valve;
[0023] U1 UPS, U2 DC power module, XF nitrogen-driven solenoid valve, QF circuit breaker;
[0024] S1 is the first smoke sensor, and S2 is the second smoke sensor;
[0025] T1 is the first temperature sensor, and T2 is the second temperature sensor;
[0026] H1 Smoke alarm, H2 Temperature alarm, H3 Fire alarm;
[0027] KA1 smoke alarm relay, KA2 temperature alarm relay
[0028] KA3 fire alarm relay;
[0029] SB1 smoke sensor test button, SB2 temperature sensor test button;
[0030] SB3 Manual fire extinguishing button, SB4 Reset button. Detailed Implementation
[0031] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0032] This utility model discloses a cable trench fire extinguishing control system, such as Figure 1As shown, the system includes a nitrogen-driven cylinder 2, a carbon dioxide cylinder group, a carbon dioxide pipeline 3, and an electrical control system. The carbon dioxide cylinder group is located in the cable trench 1 and includes several high-pressure carbon dioxide cylinders 4. Each high-pressure carbon dioxide cylinder 4 has a pneumatic flat valve 6 at its upper end. The pneumatic flat valves 6 are connected in series. The output end of the nitrogen-driven cylinder 2 is connected to the input end of the pneumatic flat valve 6 through the nitrogen-driven pipeline 5. The output end of the nitrogen-driven cylinder 2 is equipped with a nitrogen-driven manual valve 7 and a nitrogen-driven solenoid valve XF. The output end of the pneumatic flat valve 6 is connected to the carbon dioxide pipeline 3 through a pipeline. The carbon dioxide pipeline 3 runs across the top of the cable trench 1 and is evenly provided with air holes.
[0033] The electrical control system includes a UPS U1, a DC power module U2, a smoke sensor, a temperature sensor, a smoke alarm H1, and a temperature alarm H2.
[0034] Preferably, the smoke sensor and temperature sensor are arranged alternately and evenly in the cable trench 1.
[0035] The 220V AC mains power supply provides power to UPS U1. When the main power is interrupted, UPS U1 can continue to power the equipment using its built-in battery to ensure the continuity of power supply. The output of UPS U1 provides power to DC power module U2, which converts the 220V AC output voltage of UPS U1 into a safe 24V DC voltage. DC power module U2 can convert the input voltage and current signals into a stable output, providing continuous and reliable power support for the system equipment.
[0036] The output terminal of the DC power module U2 is equipped with a circuit breaker QF, which protects the downstream circuit and disconnects the power supply in time in case of a short circuit.
[0037] In one embodiment, such as Figure 2 As shown, the electrical control system includes a first smoke sensor S1, a second smoke sensor S2, a first temperature sensor T1, a second temperature sensor T2, a smoke alarm H1, and a temperature alarm H2. The normally open contacts of the first smoke sensor S1 and the second smoke sensor S2 are connected in parallel and then in series with the smoke alarm H1. The normally open contacts of the first temperature sensor T1 and the second temperature sensor T2 are connected in parallel and then in series with the temperature alarm H2.
[0038] The normally open contacts of the first smoke sensor S1 and the second smoke sensor S2 are connected in parallel with the normally open contacts of the smoke sensing test button SB1 and the smoke alarm relay KA1. The normally open contacts of the first temperature sensor T1 and the second temperature sensor T2 are connected in parallel with the normally open contacts of the temperature sensing test button SB2 and the temperature alarm relay KA2.
[0039] like Figure 3As shown, the normally open contact of the smoke alarm relay KA1 and the normally open contact of the temperature alarm relay KA2 are connected in series and then in parallel with the normally open contact of the fire alarm relay KA3. The normally open contact of the fire alarm relay KA3 is connected in series with the nitrogen-driven solenoid valve XF, and the nitrogen-driven solenoid valve XF is connected in parallel with the fire alarm H3.
[0040] The normally open contact of the fire alarm relay KA3 is connected in parallel with the manual fire extinguishing button SB3.
[0041] The normally open contacts of the smoke alarm relay KA1, temperature alarm relay KA2, and fire alarm relay KA3 are all connected to a reset button SB4.
[0042] A control method for enabling manual / automatic fire extinguishing in cable trenches, such as... Figure 4 As shown, the smoke detector and the temperature detector are inspected every 5 seconds. The two types of fire detectors work alternately. The installation method can adopt an alternating layout of smoke sensors and temperature sensors. Multiple smoke sensors and temperature sensors can be installed at the same time in a cable trench protection zone. Each sensor corresponds to a normally open contact.
[0043] In the early stages of a fire, the smoke generated can trigger the normally open contact of the smoke sensor to send a signal, causing the smoke alarm H1 to sound an alarm and prompting staff to make appropriate judgments.
[0044] When the ambient temperature of the cable heats up but has not yet reached the ignition point, a physical change occurs in the thermistor in the temperature sensor, causing the normally open contact of the temperature sensor to send a signal, which triggers the temperature alarm H2 to issue an alarm signal, reminding the staff to make the appropriate judgment.
[0045] When the smoke alarm H1 or temperature alarm H2 issues an alarm signal, the staff should confirm the situation on site. If a fire source is found, they can choose to manually extinguish the fire by pressing the manual fire extinguishing button SB3 to drive the nitrogen-driven solenoid valve XF to release the starting gas, or they can choose to manually activate the nitrogen-driven manual valve 7 to manually open the pneumatic level valve 6 and release carbon dioxide to extinguish the fire.
[0046] When smoke alarm H1 and temperature alarm H2 simultaneously issue alarm signals, and fire alarm H3 also issues an alarm signal, nitrogen-driven solenoid valve XF releases nitrogen start-up gas, automatically opening pneumatic level valve 6 to release carbon dioxide for fire extinguishing.
[0047] Once personnel discover a fire during an inspection, they can choose to manually extinguish the fire using the SB3 button, the nitrogen-driven manual valve 7, or any other type of mechanical emergency valve.
[0048] When the first smoke sensor S1 and the second smoke sensor S2 detect smoke, their normally open contacts close, the smoke alarm relay KA1 is energized and latches itself, and the smoke alarm H1 sends out an alarm signal.
[0049] Press the smoke sensor test button SB1, the smoke alarm relay KA1 is energized and latches itself, and the smoke alarm H1 emits an alarm signal. Press the reset button SB4 to deactivate the smoke alarm signal.
[0050] When the first temperature sensor T1 and the second temperature sensor T2 detect a high temperature, their normally open contacts close, the temperature alarm relay KA2 is energized and latches itself, and the temperature alarm H2 issues an alarm signal.
[0051] Press the temperature sensor test button SB2, the temperature alarm relay KA2 is energized and latches itself, and the temperature alarm H2 emits an alarm signal. Press the reset button SB4 to deactivate the temperature alarm signal.
[0052] like Figure 4 As shown, when both the smoke sensor and the temperature sensor detect signals simultaneously, the fire alarm relay KA3 is energized and self-locked, and the fire alarm H3 sounds an alarm to remind staff to evacuate. At the same time, the nitrogen-driven solenoid valve XF is activated to release the starting gas nitrogen. The nitrogen opens the pneumatic level valve 6 through the nitrogen-driven pipeline 5, releasing carbon dioxide through the carbon dioxide pipeline 3 vent and evenly discharging it into the cable trench 1 to extinguish the fire.
[0053] After confirming that the fire has been extinguished, staff will press the reset button SB4 to deactivate the fire alarm.
[0054] When staff discover a fire, they can press the manual fire extinguishing button SB3, or simultaneously press the smoke sensor test button SB1 and the temperature sensor test button SB2. The fire alarm relay KA3 will be energized and automatically lock, which can also achieve the purpose of extinguishing the fire.
[0055] When it is necessary to check whether there is a problem with the control circuit, disconnect the electromagnetic plug of the nitrogen-driven cylinder 2, press the smoke sensor test button SB1 and the temperature sensor test button SB2. If the fire alarm relay KA3 is energized and self-locked, the fire alarm H3 sounds an alarm, and the nitrogen-driven manual valve 7 is energized, it indicates that there is no abnormality in the circuit.
[0056] If other equipment needs to be activated in conjunction with the fire alarm relay KA3, a set of passive normally closed contacts can be provided. These normally closed contacts will open when a fire occurs.
[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A cable trench fire suppression control system, characterized by, The system includes a nitrogen-driven cylinder (2), a carbon dioxide cylinder group, a carbon dioxide pipeline (3), and an electrical control system. The carbon dioxide cylinder group is located in the cable trench (1). The carbon dioxide cylinder group includes several high-pressure carbon dioxide cylinders (4). Each high-pressure carbon dioxide cylinder (4) is equipped with a pneumatic flat valve (6) at its upper end. The pneumatic flat valves (6) are connected in series. The output end of the nitrogen-driven cylinder (2) is connected to the input end of the pneumatic flat valve (6) through the nitrogen-driven pipeline (5). The output end of the nitrogen-driven cylinder (2) is equipped with a nitrogen-driven manual valve (7) and a nitrogen-driven solenoid valve (XF). The output end of the pneumatic flat valve (6) is connected to the carbon dioxide pipeline (3) through a pipeline. The carbon dioxide pipeline (3) runs across the top of the cable trench (1). The carbon dioxide pipeline (3) is uniformly provided with air holes. The electrical control system includes a UPS (U1), a DC power module (U2), a smoke sensor, a temperature sensor, a smoke alarm (H1), and a temperature alarm (H2). The UPS (U1) is powered by 220V AC mains power and supplies power to the DC power module (U2). The DC power module (U2) converts the 220V AC mains power into 24V DC power to supply power to the smoke alarm and the temperature sensor. A number of normally open contacts of the smoke sensors are connected in parallel and then in series with the smoke alarm (H1); a number of normally open contacts of the temperature sensors are connected in parallel and then in series with the temperature alarm (H2); the normally open contacts of the smoke sensors are connected in parallel with the normally open contacts of the smoke alarm relay (KA1) and the smoke sensing test button (SB1); the normally open contacts of the temperature sensors are connected in parallel with the normally open contacts of the temperature alarm relay (KA2) and the temperature sensing test button (SB2); the normally open contacts of the smoke alarm relay (KA1) and the normally open contacts of the temperature alarm relay (KA2) are connected in series and then in parallel with the normally open contacts of the fire alarm relay (KA3); the normally open contacts of the fire alarm relay (KA3) are connected in series with the nitrogen-driven solenoid valve (XF); and the nitrogen-driven solenoid valve (XF) is connected in parallel with the fire alarm (H3). The normally open contact of the fire alarm relay (KA3) is connected in parallel with the manual fire extinguishing button (SB3).
2. The cable trench fire extinguishing control system according to claim 1, characterized in that, The electrical control system includes a first smoke sensor (S1), a second smoke sensor (S2), a first temperature sensor (T1), and a second temperature sensor (T2). The normally open contacts of the first smoke sensor (S1) and the second smoke sensor (S2) are connected in parallel with the normally open contacts of the smoke sensing test button (SB1) and the smoke alarm relay (KA1). The normally open contacts of the first temperature sensor (T1) and the second temperature sensor (T2) are connected in parallel with the normally open contacts of the temperature sensing test button (SB2) and the temperature alarm relay (KA2).
3. The cable trench fire extinguishing control system according to claim 1, characterized in that, The normally open contacts of the smoke alarm relay (KA1), temperature alarm relay (KA2), and fire alarm relay (KA3) are all connected to a reset button (SB4).
4. The cable trench fire extinguishing control system according to claim 1, characterized in that, The output terminal of the DC power module (U2) is equipped with a circuit breaker (QF).