Fire-fighting smoke exhaust fan control method and system based on fire smoke spreading self-starting and self-stopping

Abstract

The invention relates to the technical field of smoke exhaust fan control, in particular to a fire-fighting smoke exhaust fan control method and system based on fire smoke spreading self-starting and self-stopping. A fire detector is adopted to detect whether a fire exists in a set area or not; real-time temperature information and real-time shielding information in the protected area are collected in real time; fire information is obtained based on the real-time temperature information and the real-time shielding information; judging whether a fire early warning criterion is met or not according to the fire information; when the fire hazard early warning criterion is met, controlling the motor speed of the smoke exhaust fan corresponding to the protected area set by the fire hazard detector to be increased; when the fire hazard early warning criterion is not met, the motor speed of the smoke exhaust fan corresponding to the protected area set by the fire hazard detector is controlled to be kept unchanged at the existing running speed, and a comprehensive fire hazard environment sensing system is constructed by collecting real-time temperature information and real-time shielding information at the same time; therefore, the system can judge the development condition of the fire and the spreading trend of the smoke more accurately.

Description

Technical Field

[0001] The present invention relates to the technical field of smoke exhaust fan control, and more specifically, to a fire smoke exhaust fan control method and system based on automatic start and stop of fire smoke spreading. Background Art

[0002] With the acceleration of urbanization and the increasing complexity of buildings, fire safety issues have received more and more attention from all walks of life. When a fire occurs, effective smoke control and removal can not only buy precious time for personnel evacuation, but also create favorable conditions for fire rescue. Traditional fire smoke exhaust systems usually use fixed parameter control, that is, when a fire occurs, the smoke exhaust fan is started according to the preset fixed parameters. However, this method is difficult to adapt to complex and changeable fire scenes, often resulting in poor smoke exhaust effects, and may even aggravate the spread of the fire.

[0003] In recent years, with the development of sensor technology and control algorithms, some improved smoke exhaust control methods have gradually emerged. For example, some systems adjust the speed of the smoke exhaust fan by real-time monitoring of smoke concentration. Some systems also introduce temperature sensors to judge the development of fire according to temperature changes. However, these methods still have many shortcomings. First, the monitoring of a single parameter is difficult to fully reflect the complexity of the fire, which is prone to misjudgment or missed judgment. Secondly, most systems lack in-depth analysis of the dynamics of smoke spread and cannot achieve precise zoning control. Furthermore, existing systems generally lack effective fault-tolerant mechanisms. Once key sensors fail, the reliability of the entire system will be greatly reduced.

[0004] In addition, existing smoke exhaust control systems often ignore the natural smoke exhaust capacity of buildings. In fact, the rational use of the natural ventilation characteristics of buildings can significantly improve the smoke exhaust effect without consuming additional energy. However, how to find the best balance between mechanical smoke exhaust and natural smoke exhaust is still a technical problem that needs to be solved.

[0005] In view of the above problems, the industry urgently needs a more intelligent, reliable and efficient fire smoke exhaust fan control method. This method should be able to fully perceive the fire environment, accurately judge the smoke spread, and dynamically adjust the smoke exhaust strategy according to the real-time situation. At the same time, the method should also have good fault tolerance and adaptability to cope with various complex fire scenarios. Summary of the invention

[0006] The present invention is proposed to address these problems in the prior art. By innovatively combining multiple sensing technologies and introducing advanced data analysis algorithms, the present invention proposes a fire smoke exhaust fan control method and system based on fire smoke spread automatic start and stop. This method can not only achieve accurate monitoring and control of smoke spread, but also make full use of the natural smoke exhaust capacity of the building, thereby greatly improving the smoke exhaust efficiency.

[0007] The present invention provides a fire smoke exhaust fan control method based on fire smoke spread automatic start and stop, comprising:

[0008] The acquisition steps include:

[0009] Use fire detectors to detect whether there is a fire in the set area;

[0010] Collect real-time temperature information and real-time shading information in the protected area;

[0011] Processing steps include:

[0012] Obtaining fire information based on the real-time temperature information and the real-time shielding information;

[0013] According to the fire information, determining whether a fire warning criterion is met;

[0014] Output steps include:

[0015] When the fire warning criterion is met, the motor speed of the smoke exhaust fan corresponding to the protected area set by the fire detector is controlled to increase;

[0016] When the fire warning criterion is not met, the motor speed of the smoke exhaust fan corresponding to the protected area set by the fire detector is controlled to maintain the existing operating speed unchanged.

[0017] Preferably, the obtaining step specifically includes:

[0018] A temperature measuring device is provided at each detection point in the protected area to collect temperature data of the protected area to obtain the real-time temperature information;

[0019] An obstacle detection device is arranged at each detection point in the protected area to collect obstacle distance data in the protected area to obtain the real-time shielding information.

[0020] Preferably, the processing step further comprises:

[0021] Determining whether the temperature measuring device fails;

[0022] When the temperature measuring device fails, the obstacle detection device is used to determine whether there is an obstacle in the protected area;

[0023] When no obstacle appears, the motor of the smoke exhaust fan corresponding to the protected area is controlled to maintain the existing operating speed without increasing;

[0024] When an obstacle appears, the motor speed of the smoke exhaust fan corresponding to the protected area is controlled to decrease.

[0025] Preferably, determining whether the fire warning criteria are met in the processing step includes:

[0026] Determining whether the temperature of the protected area exceeds a set value according to the real-time temperature information;

[0027] Determine whether there is an obstacle in the protected area according to the real-time occlusion information;

[0028] When the temperature exceeds the set value or an obstacle appears, determining that the fire warning criterion is met;

[0029] When the temperature does not exceed the set value and no obstacle appears, it is determined that the fire warning criterion is not satisfied.

[0030] As a preferred embodiment, the system further includes a shutdown judgment step:

[0031] When the fire warning criteria are not met, determining whether there is a shutdown condition;

[0032] When the shutdown condition exists, controlling the motor speed of the smoke exhaust fan corresponding to the protected area to decrease;

[0033] Continue to determine whether the shutdown condition exists, and when the shutdown condition occurs, control the smoke exhaust fan corresponding to the protected area to shut down.

[0034] Preferably, the shutdown condition includes at least one of the following:

[0035] The fire in the protected area is extinguished;

[0036] Firefighters enter the protected area;

[0037] The protected area continues without fire for more than a set time.

[0038] As a preference, the step of partition control is also included:

[0039] Get floor height information;

[0040] Based on the floor height information, fire situation judgment and smoke exhaust fan control are performed separately for each stairwell;

[0041] Set the pre-start conditions and start conditions for the smoke exhaust fan, and control the start and stop of the smoke exhaust fan according to the fire conditions on different floors.

[0042] Preferably, the method further comprises the following steps:

[0043] Obtain a set A of all floors whose smoke and gas monitoring information values ​​are greater than a threshold;

[0044] Calculate the average value of the smoke and smoke monitoring information values ​​of each floor in the set A whose smoke and smoke monitoring information is greater than a threshold;

[0045] When the average value is less than the preset threshold, the smoke exhaust fans turned on in all floors in the set A are turned off until the smoke and gas monitoring information value of the first floor in the set A is greater than the threshold.

[0046] As a preferred embodiment, the hardware protection step is also included:

[0047] A fan high-voltage relay is provided in the control circuit of the smoke exhaust fan;

[0048] Setting a bypass switch of the fan high-voltage relay;

[0049] When a system failure is detected, manual starting of the smoke exhaust fan is ensured by manually operating the bypass switch.

[0050] The fire smoke exhaust fan control system based on fire smoke spread automatic start and stop for executing the method comprises:

[0051] Fire detection module, used to detect whether there is a fire in the set area;

[0052] An information collection module is used to collect real-time temperature information and real-time shielding information in the protected area;

[0053] Smoke spread control module for:

[0054] Obtaining fire information based on the real-time temperature information and the real-time shielding information;

[0055] According to the fire information, determining whether a fire warning criterion is met;

[0056] When the fire warning criterion is met, the motor speed of the smoke exhaust fan corresponding to the protected area set by the fire detector is controlled to increase;

[0057] When the fire warning criteria are not met, the motor speed of the smoke exhaust fan corresponding to the protected area set by the fire detector is controlled to maintain the existing operating speed unchanged;

[0058] Wherein, the information collection module includes:

[0059] A temperature measuring device is provided at each detection point in the protected area, and is used to collect temperature data of the protected area to obtain the real-time temperature information;

[0060] The obstacle detection device arranged at each detection point in the protected area is used to collect obstacle distance data in the protected area to obtain the real-time shielding information.

[0061] The beneficial effects of the present invention are mainly reflected in the following aspects:

[0062] Specifically, the present invention constructs a comprehensive fire environment perception system by simultaneously collecting real-time temperature information and real-time occlusion information. This multi-dimensional data collection method enables the system to more accurately judge the development of the fire and the spread of smoke. Based on these rich data, the present invention introduces a set of advanced fire warning criteria judgment mechanisms, which can make accurate warnings in the early stages of the fire, thus buying valuable time for subsequent smoke exhaust control.

[0063] More importantly, the present invention realizes dynamic adjustment of the motor speed of the smoke exhaust fan. When the fire warning criteria are met, the system will increase the motor speed of the smoke exhaust fan in a timely manner to cope with the intensified fire; when the warning criteria are not met, the system will maintain the existing operating speed to avoid unnecessary energy consumption. This flexible control strategy not only improves the smoke exhaust efficiency, but also realizes the rational use of energy.

[0064] Another major innovation of the present invention is its full utilization of natural smoke exhaust. By precisely controlling the start and stop timing and operating parameters of the smoke exhaust fan, the system can maximize the natural ventilation capacity of the building itself. This method of combining mechanical smoke exhaust with natural smoke exhaust can not only significantly improve the overall smoke exhaust effect, but also greatly reduce energy consumption.

[0065] In addition, the present invention also has excellent fault tolerance and adaptability. By introducing multiple judgment mechanisms and backup control strategies, the system can still maintain stable and reliable operation even when some sensors fail. This greatly improves the reliability and safety of the entire smoke exhaust system.

[0066] In general, the fire smoke exhaust fan control method and system based on fire smoke spread automatic start and stop proposed in the present invention not only solves many problems existing in the prior art, but also achieves significant breakthroughs in smoke exhaust efficiency, energy utilization, system reliability, etc. This innovative solution is expected to bring revolutionary progress to the field of building fire safety and make important contributions to protecting people's lives and property. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 The figure is a flow chart of the method of the present invention.

[0068] Figure 2 This is a flow chart of the information collection and early warning judgment method of the present invention.

[0069] Figure 3 This is a logic block diagram for determining whether the temperature measuring device of the present invention has failed.

[0070] Figure 4 It is a logic block diagram of shutdown judgment of the present invention.

[0071] Figure 5 It is a system logic block diagram of the present invention. DETAILED DESCRIPTION

[0072] Please refer to Figure 5 The present invention relates to a fire smoke exhaust fan control method and system based on fire smoke spread automatic start and stop. The method automatically adjusts the working parameters of the fire smoke exhaust fan by real-time monitoring and analyzing the spread of fire smoke to achieve efficient smoke exhaust effect.

[0073] First, the method of the present invention includes an acquisition step, a processing step and an output step. In the acquisition step, a fire detector is used to detect whether there is a fire in a set area. Preferably, the fire detector can be a smoke sensor, an infrared detector or an infrared camera. At the same time, the method also collects real-time temperature information and real-time shielding information in the protected area in real time. The collection of this information is crucial for accurately judging the spread of fire smoke.

[0074] In the processing step, the method of the present invention obtains fire information based on the collected real-time temperature information and real-time shielding information. The fire information here may include key parameters such as the location, intensity, and spread speed of the fire. Subsequently, based on the obtained fire information, it is determined whether the fire warning criteria are met. The fire warning criteria can be set according to the specific building type and fire protection requirements. For example, when the temperature exceeds 60°C or the smoke concentration exceeds a certain threshold, it can be considered that the fire warning criteria are met.

[0075] In the output step, when the fire warning criteria are met, the method controls the motor speed of the smoke exhaust fan corresponding to the protected area set by the fire detector to increase. In this way, the smoke exhaust force can be increased in time to prevent the rapid spread of fire smoke. On the contrary, when the fire warning criteria are not met, the motor speed of the smoke exhaust fan remains unchanged at the existing operating speed to avoid unnecessary energy consumption.

[0076] Furthermore, the present invention adopts a refined information collection method in the acquisition step. Specifically, a temperature measuring device is provided at each detection point in the protected area to collect temperature data of the protected area, so as to obtain real-time temperature information. The temperature measuring device may be an infrared temperature measuring device or a laser temperature measuring device, and its measurement accuracy can generally reach ±0.5°C. At the same time, an obstacle detection device is also provided at each detection point to collect obstacle distance data in the protected area, and then obtain real-time occlusion information. The obstacle detection device may be an infrared obstacle detection device or a laser obstacle detection device, and its detection distance can generally reach more than 10 meters.

[0077] The method of the present invention also includes an important fault-tolerant mechanism. In the processing step, it is first determined whether the temperature measuring device fails. When the temperature measuring device fails, the system uses the obstacle detection device to determine whether there are obstacles in the protected area. This design can effectively improve the reliability and robustness of the system. Specifically, when there is no obstacle, the system will control the motor of the smoke exhaust fan corresponding to the protected area to maintain the existing operating speed without increasing it. This is because it is not advisable to rashly increase the smoke exhaust force when there is no clear evidence of fire. When an obstacle is detected, the system will control the motor speed of the smoke exhaust fan to decrease. This is to take into account that the obstacle may be caused by smoke or other reasons, and appropriately reducing the smoke exhaust force can prevent the fire from spreading further.

[0078] In practical applications, the method of the present invention can flexibly set various parameters according to different building types and fire protection requirements. For example, for high-rise buildings, the temperature threshold can be set to 55°C, while for underground buildings, the temperature threshold can be set to 50°C. Similarly, the distance threshold of obstacle detection can also be adjusted according to actual conditions, and can usually be set between 5 and 15 meters.

[0079] In general, the method of the present invention realizes precise control of fire smoke exhaust fans by comprehensively utilizing multiple sensor data and adopting intelligent judgment logic. This can not only improve the smoke exhaust efficiency, but also reduce energy consumption, while greatly improving the reliability and safety of the system. When a fire occurs, this method can win precious time for personnel evacuation and fire rescue, and has important practical application value. In a preferred embodiment of the present invention, the process of judging whether the fire warning criteria are met is further refined. Specifically, the system first determines whether the temperature of the protected area exceeds the set value based on the real-time temperature information. This set value can be adjusted according to different building types and fire protection requirements. For example, for ordinary office buildings, the temperature threshold can be set to 60°C; for warehouses for flammable and explosive goods, the temperature threshold may need to be reduced to 50°C or lower.

[0080] At the same time, the system will also determine whether there are obstacles in the protected area based on real-time occlusion information. The obstacles here may be caused by thick smoke, flames or collapsed building components. Generally, if the obstacle detection device detects abnormal occlusion within a range of 5 meters, it can be considered that there is an obstacle.

[0081] The method of the present invention adopts a flexible judgment logic: when the temperature exceeds the set value or an obstacle appears, the system will determine that the fire warning criterion is met. This or relationship can ensure that the system can respond promptly to various possible fire situations. On the contrary, when the temperature does not exceed the set value and no obstacle appears, the system will determine that the fire warning criterion is not met. This design can effectively reduce false alarms and avoid unnecessary smoke exhaust operations.

[0082] Furthermore, the method of the present invention also includes an important shutdown judgment step. When the fire warning criteria are not met, the system will continue to judge whether there are shutdown conditions. The design purpose of this step is to stop the smoke exhaust operation in time after the fire is controlled or eliminated to save energy and restore the normal building environment.

[0083] Specifically, when a shutdown condition exists, the system will control the motor speed of the smoke exhaust fan corresponding to the protected area to gradually decrease. This gradual speed adjustment can avoid the negative effects that may be caused by sudden shutdown, such as air flow turbulence. At the same time, the system will continue to determine whether there is a shutdown condition. When it is confirmed that the shutdown condition persists, the system will eventually control the smoke exhaust fan to shut down completely.

[0084] In one embodiment of the present invention, the shutdown conditions may include multiple aspects. First, if the fire in the protected area is extinguished, this is obviously an important shutdown condition. Secondly, if firefighters are detected entering the protected area, it can also be used as a shutdown condition, because at this time it may be necessary to decide whether to continue smoke exhaust based on the on-site judgment of the firefighters. Finally, if there is no sign of fire in the protected area for more than a set time, it can also be considered that the shutdown condition is met. This set time can usually be set to 30 minutes to 2 hours, depending on the characteristics of the building and fire protection requirements.

[0085] The method of the present invention also introduces the concept of zoning control, which is particularly effective when dealing with fires in high-rise buildings or large complexes. In the zoning control step, the system first obtains floor height information. This information can be pre-entered into the system or obtained through real-time measurement. Preferably, the floor height information should include the actual height of each floor, not just the number of floors.

[0086] Based on the floor height information, the system can independently determine the fire situation and control the smoke exhaust fan in each stairwell. This refined control can better adapt to different fire situations that may exist on different floors. For example, for higher floors, considering the rising characteristics of smoke, a greater smoke exhaust force may be required; while for lower floors, more attention may be needed to prevent smoke from spreading upwards.

[0087] In addition, this method also sets the pre-start condition and start condition of the smoke exhaust fan fire. The pre-start condition can be set relatively loosely, for example, when the temperature of a certain floor exceeds 45°C, the pre-start is performed. The start condition can be set more strictly, such as when the temperature exceeds 55°C or obvious smoke is detected, it is officially turned on. This hierarchical start strategy can ensure timely response while avoiding unnecessary energy consumption.

[0088] In general, the method of the present invention greatly improves the intelligence level and operation efficiency of the fire smoke exhaust system by introducing mechanisms such as shutdown judgment and partition control. This can not only better cope with complex fire situations, but also restore the normal building environment in time after the fire is controlled, which has important practical application value. In another preferred embodiment of the present invention, a more sophisticated smoke and fume monitoring and control step is introduced. The core of this step is to conduct a comprehensive analysis and dynamic control of the smoke and fume conditions on multiple floors, so as to achieve a more efficient and accurate smoke exhaust effect.

[0089] Specifically, the system first obtains a set A of all floors whose smoke and gas monitoring information values ​​are greater than the threshold. The threshold here can be set according to different types of buildings and fire protection requirements. For example, for ordinary office buildings, the smoke concentration threshold can be set to 0.1 grams per cubic meter; while for places with higher air quality requirements such as hospitals, the threshold may need to be lowered to 0.05 grams per cubic meter.

[0090] After obtaining set A, the system will calculate the average value of the smoke and smoke monitoring information values ​​of each floor in the set whose smoke and smoke monitoring information is greater than the threshold. This average value can reflect the overall spread of the current fire smoke. Preferably, when calculating the average value, a weighted average method can be used to give a higher weight to the floor closer to the fire source to more accurately reflect the fire situation.

[0091] Next, the system will compare the calculated average value with the preset threshold. This preset threshold is usually slightly higher than the monitoring threshold of a single floor, for example, it can be set to 1.2 times the threshold of a single floor. When the average value is less than the preset threshold, the system will adopt a unique control strategy: turn off the smoke exhaust fans on all floors in set A until the smoke and gas monitoring information value of the first floor in set A is greater than the threshold.

[0092] The design concept of this control strategy is based on a deep understanding of smoke dynamics and building air flow characteristics. By temporarily shutting down the smoke exhaust fans on some floors, an airflow environment that is conducive to smoke concentration can be created, thereby more effectively directing smoke to the designated smoke exhaust channel. At the same time, this method can also prevent smoke diffusion caused by excessive smoke exhaust, that is, smoke is dispersed to a larger area, which increases the difficulty of smoke exhaust.

[0093] In actual applications, the effect of this control strategy may vary depending on factors such as building structure and fire location. Therefore, the method of the present invention also includes a real-time feedback mechanism. The system continuously monitors the smoke and gas conditions on each floor and dynamically adjusts the opening state of the smoke exhaust fan based on the monitoring results. This dynamic adjustment can ensure that the smoke exhaust effect is always maintained at the best state.

[0094] In order to further improve the reliability and safety of the system, the method of the present invention also includes a hardware protection step. In this step, a fan high-voltage relay is first set in the control circuit of the smoke exhaust fan. This high-voltage relay can ensure the stable operation of the smoke exhaust fan during normal operation, and quickly cut off the power supply in the event of a fault to prevent equipment damage.

[0095] In addition, the system is also equipped with a bypass switch for the fan high-voltage relay. The function of this bypass switch is to provide a method for manually starting the smoke exhaust fan when a system failure occurs. When a system failure is detected, the operator can manually operate the bypass switch to ensure the start of the smoke exhaust fan, thereby ensuring the smoke exhaust function in an emergency.

[0096] Finally, the present invention also proposes a fire smoke exhaust fan control system based on fire smoke spread automatic start and stop. This system is mainly composed of three core modules: fire detection module 1, information collection module 2 and smoke spread control module 3.

[0097] The fire detection module 1 is mainly used to detect whether there is a fire in a set area. This module can include various types of sensors, such as smoke sensors, temperature sensors, and infrared sensors. Through the coordinated work of these sensors, the fire detection module 1 can quickly and accurately identify the occurrence of a fire.

[0098] The information collection module 2 is responsible for collecting real-time temperature information and real-time occlusion information in the protected area. This module includes a temperature measuring device and an obstacle detection device set at each detection point in the protected area. The temperature measuring device can use thermocouple or infrared temperature measurement technology, while the obstacle detection device may use ultrasonic or laser technology.

[0099] The smoke spread control module 3 is the core of the whole system. It obtains fire information based on the real-time temperature information and real-time shielding information obtained from the information acquisition module 2. Then, based on this fire information, it determines whether the fire warning criteria are met. When the fire warning criteria are met, the smoke spread control module 3 will control the motor speed of the smoke exhaust fan corresponding to the protected area set by the fire detector to increase; otherwise, the existing operating speed remains unchanged.

[0100] The coordinated work of these three modules enables the entire system to monitor and control the spread of fire smoke in real time and accurately, thereby achieving efficient and intelligent fire smoke exhaust. At the same time, the modular design of the system also facilitates future upgrades and expansions, allowing the system to continuously adapt to new fire protection needs and technological developments.

[0101] It should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, replacement, and improvement made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fire smoke exhaust fan control method based on fire smoke spread automatic start and stop, characterized in that: include: The acquisition steps include: Use fire detectors to detect whether there is a fire in the set area; Collect real-time temperature information and real-time shading information in the protected area; Processing steps include: Obtaining fire information based on the real-time temperature information and the real-time shielding information; According to the fire information, determining whether a fire warning criterion is met; Output steps include: When the fire warning criterion is met, the motor speed of the smoke exhaust fan corresponding to the protected area set by the fire detector is controlled to increase; When the fire warning criterion is not met, the motor speed of the smoke exhaust fan corresponding to the protected area set by the fire detector is controlled to maintain the existing operating speed unchanged.

2. The method according to claim 1, characterized in that The acquisition step specifically includes: A temperature measuring device is provided at each detection point in the protected area to collect temperature data of the protected area to obtain the real-time temperature information; An obstacle detection device is arranged at each detection point in the protected area to collect obstacle distance data in the protected area to obtain the real-time shielding information.

3. The method according to claim 2, characterized in that The processing steps also include: Determining whether the temperature measuring device fails; When the temperature measuring device fails, the obstacle detection device is used to determine whether there is an obstacle in the protected area; When no obstacle appears, the motor of the smoke exhaust fan corresponding to the protected area is controlled to maintain the existing operating speed without increasing; When an obstacle appears, the motor speed of the smoke exhaust fan corresponding to the protected area is controlled to decrease.

4. The method according to claim 1, characterized in that: The processing step of determining whether the fire warning criteria are met includes: Determining whether the temperature of the protected area exceeds a set value according to the real-time temperature information; Determine whether there is an obstacle in the protected area according to the real-time occlusion information; When the temperature exceeds the set value or an obstacle appears, determining that the fire warning criterion is met; When the temperature does not exceed the set value and no obstacle appears, it is determined that the fire warning criterion is not satisfied.

5. The method according to claim 1, characterized in that It also includes the shutdown judgment steps: When the fire warning criteria are not met, determining whether there is a shutdown condition; When the shutdown condition exists, controlling the motor speed of the smoke exhaust fan corresponding to the protected area to decrease; Continue to determine whether the shutdown condition exists, and when the shutdown condition occurs, control the smoke exhaust fan corresponding to the protected area to shut down.

6. The method according to claim 5, characterized in that The shutdown condition includes at least one of the following: The fire in the protected area is extinguished; Firefighters enter the protected area; The protected area continues without fire for more than a set time.

7. The method according to claim 1, characterized in that It also includes the partition control step: Get floor height information; Based on the floor height information, fire situation judgment and smoke exhaust fan control are performed separately for each stairwell; Set the pre-start conditions and start conditions for the smoke exhaust fan, and control the start and stop of the smoke exhaust fan according to the fire conditions on different floors.

8. The method according to claim 1, characterized in that It also includes smoke and gas monitoring and control steps: Obtain a set A of all floors whose smoke and gas monitoring information values ​​are greater than a threshold; Calculate the average value of the smoke and smoke monitoring information values ​​of each floor in the set A whose smoke and smoke monitoring information is greater than a threshold; When the average value is less than the preset threshold, the smoke exhaust fans turned on in all floors in the set A are turned off until the smoke and gas monitoring information value of the first floor in the set A is greater than the threshold.

9. The method according to claim 1, characterized in that: Also includes hardware protection steps: A fan high-voltage relay is provided in the control circuit of the smoke exhaust fan; Setting a bypass switch of the fan high-voltage relay; When a system failure is detected, manual starting of the smoke exhaust fan is ensured by manually operating the bypass switch.

10. A fire smoke exhaust fan control system based on fire smoke spread automatic start and stop, which implements the method described in any one of claims 1 to 9, characterized in that: include: Fire detection module, used to detect whether there is a fire in the set area; An information collection module is used to collect real-time temperature information and real-time shielding information in the protected area; Smoke spread control module for: Obtaining fire information based on the real-time temperature information and the real-time shielding information; According to the fire information, determining whether a fire warning criterion is met; When the fire warning criterion is met, the motor speed of the smoke exhaust fan corresponding to the protected area set by the fire detector is controlled to increase; When the fire warning criteria are not met, the motor speed of the smoke exhaust fan corresponding to the protected area set by the fire detector is controlled to maintain the existing operating speed unchanged; Wherein, the information collection module includes: A temperature measuring device is provided at each detection point in the protected area, and is used to collect temperature data of the protected area to obtain the real-time temperature information; The obstacle detection device arranged at each detection point in the protected area is used to collect obstacle distance data in the protected area to obtain the real-time shielding information.

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