Fire detection system and working method thereof

Abstract

The invention discloses a fire detection system and a working method thereof, the system comprises an air-breathing smoke detector, the air-breathing smoke detector comprises an air-breathing structure and a detection host, and the air-breathing structure is connected with the detection host; and one end of the air suction structure is inserted into the high-radiation area. By implementing the system, the problems of high failure rate and low reliability of installation of a point type smoke detector, a flame detector, a temperature sensor and the like in a high-radiation area of a reactor coolant pump can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of fire detection systems, and in particular to a fire detection system and a working method thereof. Background Art

[0002] A significant difference between a nuclear power plant and a traditional thermal power plant or hydropower plant is that there is a nuclear island inside it, and radioactive substances are produced when nuclear fuel burns in the containment. According to the different radiation doses, the radiation area is divided into red zone, orange zone, yellow zone, green zone and white zone, among which the red zone has the highest radiation dose and is collectively referred to as the high radiation zone, while other areas are low radiation areas.

[0003] The radiation zoning of the outer containment of the nuclear island is the yellow zone, while the inner containment includes the yellow zone, orange zone and red zone. In the inner containment of the nuclear island, the main equipment includes steam generators, reactor coolant pumps and pressurizers. The reactor coolant pump contains a large amount of lubricating oil, so there is a fire risk in this area, and its radiation zoning is classified as the red zone.

[0004] In order to effectively monitor and prevent fires, fire detection systems must be installed in high-risk areas, usually using point-type smoke detectors, point-type and line-type temperature detectors, and flame detectors. For example, point-type smoke detectors or flame detectors are installed in areas where there is a risk of oil fires, and point-type smoke detectors or flame detectors are installed in the reactor coolant pump area. However, since the environment in high-radiation areas will cause significant radiation damage to the electronic components of the detectors, the failure rate of these devices is high, resulting in the need for frequent replacement, which increases manpower and material costs. In addition, operation and maintenance personnel work in a high-radiation environment and face greater radiation risks, which affects the reliability of the technical solution. In addition, temperature sensors can be used in the reactor coolant pump compartment by referring to the practice of the steam generator compartment. When the compartment temperature reaches the set threshold, the temperature sensor can respond quickly and output a signal for fire judgment. However, the temperature thresholds of most temperature sensors on the market are basically determined at the factory, and the adjustability is poor and the accuracy is relatively low. For important equipment such as the reactor coolant pump, the use of existing temperature sensors for fire detection may not be appropriate, which in turn affects the reliability of the technical solution.

[0005] Therefore, it is necessary to design a new system to solve the problems of high failure rate and low reliability of point-type smoke detectors, flame detectors, temperature sensors, etc. installed in high radiation areas of reactor coolant pumps. Summary of the invention

[0006] The object of the present invention is to overcome the defects of the prior art and provide a fire detection system and a working method thereof.

[0007] In order to solve the above technical problems, the purpose of the present invention is achieved through the following technical solutions: providing. A fire detection system, comprising: an aspirating smoke detector, the aspirating smoke detector comprising an aspirating structure and a detection host, the aspirating structure is connected to the detection host; one end of the aspirating structure is inserted in a high radiation area.

[0008] Its further technical solution is: the air suction structure includes a sampling tube and an air suction pump, one end of the sampling tube is inserted in the high radiation area, the other end of the sampling tube is connected to the air suction pump, and the air suction pump is connected to the detection host.

[0009] Its further technical solution is: it also includes a gas exhaust structure, one end of which is connected to the detection host; and the other end of the gas exhaust structure is inserted into the high radiation area.

[0010] A further technical solution is as follows: the gas exhaust structure includes an exhaust pipe; one end of the exhaust pipe is connected to the detection host; and the other end of the exhaust pipe is inserted into the high radiation area.

[0011] Its further technical solution is: it also includes a gas processing structure; one end of the gas processing structure is connected to the air intake structure; the other end of the gas processing structure is connected to the detection host.

[0012] A further technical solution is as follows: the gas processing structure includes a filter, and the filter is connected to the detection host.

[0013] A further technical solution is as follows: the gas processing structure further comprises a purge device, one end of which is connected to the air suction pump; and the other end of which is connected to the filter.

[0014] A further technical solution is: the number of the detection hosts is at least 2.

[0015] A further technical solution is: each of the detection hosts is connected to at least two of the air intake structures.

[0016] A further technical solution is: it also includes a power supply unit, and the power supply unit is connected to the aspiration type smoke detector.

[0017] A further technical solution is: it also includes a fault switching component, the number of the aspirating smoke detectors is at least two, and the fault switching component is connected between the power supply unit and the aspirating smoke detectors.

[0018] Its further technical solution is: the power supply unit includes a positive pole and a negative pole, the fault switching component includes a switching relay, a normal relay, a normal contact, a fault relay and a fault contact, the normal contact is connected to the positive pole of the power supply unit; the normal relay is connected to the normal contact, the normal relay is connected to one of the aspirating smoke detectors; the other end of the normal contact is connected to the fault contact; the fault contact is connected to the fault relay; the other end of the fault contact is connected to the switching relay; the switching relay is connected to another aspirating smoke detector.

[0019] In addition, in order to overcome the defects of the prior art, the present invention also provides a working method performed by the above-mentioned fire detection system, comprising:

[0020] The air suction structure is used to extract air samples from high radiation areas, and the smoke concentration in the air samples is analyzed by the detection host to determine the fire situation.

[0021] The beneficial effects of the present invention compared with the prior art are as follows: the present invention arranges an aspirating smoke detector, which includes an aspirating structure and a detection host, and detects by continuously sucking air samples. This method avoids direct exposure to a high-radiation environment. The aspirating design avoids frequent physical contact and the use of moving parts. A redundant design is adopted, so that even if some components fail, other components can continue to work, thereby solving the problems of high failure rate and low reliability of point-type smoke detectors, flame detectors, temperature sensors, etc. installed in high-radiation areas of reactor coolant pumps.

[0022] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0024] Figure 1 A structural schematic diagram of a fire detection system provided by an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the specific structure of a fire detection system provided by an embodiment of the present invention;

[0026] Figure 3 A specific circuit schematic diagram of a fault switching component provided by an embodiment of the present invention;

[0027] Description of the symbols in the figure:

[0028] 1. Sampling tube; 2. Purge device; 3. Filter device; 4. Exhaust pipe; 5. Detection host; 100. Aspirating smoke detector. DETAILED DESCRIPTION

[0029] 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 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.

[0030] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0031] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0032] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0033] The radiation areas of existing nuclear power plants are divided into red, orange, yellow, green and white zones, with the red zone having the strongest radiation. The containment in the nuclear island contains a number of high-risk equipment, such as reactor coolant pumps, which pose a fire risk due to the presence of lubricating oil. Fire detection systems need to be installed in high-risk areas, but radiation damages electronic components and detector failure rates are high, increasing operation and maintenance costs. Operation and maintenance personnel face greater risks when working in a high-radiation environment, affecting the reliability of the technical solution. Existing temperature sensors have poor adjustability and low accuracy, and may not be suitable for fire monitoring of important equipment.

[0034] To this end, an embodiment of the present invention provides a fire detection system and a working method thereof to solve the problem of high failure rate and low reliability of point-type smoke detectors, flame detectors, temperature sensors, etc. installed in high radiation areas of reactor coolant pumps.

[0035] Specifically, the fire detection system includes an aspirating smoke detector 100, which includes an aspirating structure and a detection host 5, wherein the aspirating structure includes a sampling tube 1 and an aspirating pump, one end of the sampling tube 1 is located in a high radiation area, and is also equipped with a gas exhaust structure and a gas processing structure, and gas processing is performed through a filter and a purge device 2. In addition, the number of detection hosts 5 is set to at least two, each host can be connected to multiple aspirating structures, and a power supply unit and a fault switching component are also set to ensure reliable power supply and fault handling.

[0036] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0037] See also Figure 1 and Figure 2 The above-mentioned fire detection system includes: an aspirating smoke detector 100, which includes an aspirating structure and a detection host 5, and the aspirating structure is connected to the detection host 5; one end of the aspirating structure is inserted in a high radiation area.

[0038] In this embodiment, the detection host 5 is arranged in the outer ring gallery of the containment in the low radiation area, and the sampling tube 1 is commonly made of PVC (polyvinyl chloride), ABS (acrylonitrile butadiene styrene plastic), copper, stainless steel and the like.

[0039] The fire detection system monitors smoke in the environment through an aspirating smoke detector 100. The aspirating structure is responsible for sucking air from the high radiation area. The detection host 5 analyzes the air sample sucked from the high radiation area to detect whether there is smoke or fire signs.

[0040] Air is sucked in through the sampling tube 1 and sent to the detection host 5 for processing. The detection host 5 will promptly identify the presence of smoke and trigger an alarm or other emergency response measures.

[0041] In this embodiment, except for the sampling tube 1 which needs to be inserted in the high radiation area, the others are arranged in the low radiation area.

[0042] In addition, a circuit board with special anti-corrosion treatment is provided in the detection host 5. Specifically, the welding terminals and electrical components on the circuit board are sprayed with anti-corrosion paint. This design ensures that the sampled air will not directly contact the electrical components, thereby effectively preventing corrosion; even under strong radiation conditions, the system can still ensure stable operation and reduce the failure rate; the design takes into account the harsh environment to ensure that the equipment can work reliably under various extreme conditions; anti-corrosion measures reduce the maintenance requirements of the equipment and reduce long-term operating costs; ensure that the equipment works normally in high-risk environments, and improve the overall safety and responsiveness of the system.

[0043] In summary, this design not only improves the reliability of the system, but also extends the service life of the equipment, ensuring effective performance in harsh environments.

[0044] In one embodiment, see Figure 1 and Figure 2 The above-mentioned air suction structure includes a sampling tube 1 and an air suction pump. One end of the sampling tube 1 is inserted in the high radiation area, and the other end of the sampling tube 1 is connected to the air suction pump, and the air suction pump is connected to the detection host 5.

[0045] Specifically, the sampling tube 1 is generally made of several common materials, including PVC (polyvinyl chloride), ABS (plastic acrylonitrile-butadiene-styrene), copper and stainless steel. In high-radiation areas, the use of a sampling tube 1 made of radiation-resistant material, such as SS316L stainless steel, can effectively protect the main pump compartment. The sampling tube 1 is provided with a sampling hole, and its protection radius is designed to meet the requirements of point-type smoke detectors to ensure that the area to be monitored is fully covered.

[0046] In one embodiment, see Figure 1 and Figure 2 The fire detection system further comprises a gas exhaust structure, one end of which is connected to the detection host 5; the other end of which is inserted in the high radiation area. The sampled air sample is discharged back to the high-dose radiation protection area through the gas exhaust structure after analysis.

[0047] In one embodiment, see Figure 1 and Figure 2 The above-mentioned gas exhaust structure includes an exhaust pipe; one end of the exhaust pipe is connected to the detection host 5; and the other end of the exhaust pipe is inserted in the high radiation area.

[0048] In this fire detection system, the gas exhaust structure is designed to effectively process air samples in high radiation areas. One end of the gas exhaust structure is connected to the detection host 5, and the other end goes deep into the high radiation area. Through this structure, the sampled air samples will be discharged back to the high radiation area after analysis to ensure the safety and stability of the monitoring area.

[0049] It should be noted that the portion of the exhaust pipe 4 inserted in the high radiation area needs to be made of the same material as the sampling tube 1, such as radiation-resistant SS stainless steel 316L.

[0050] Specifically, the gas exhaust structure includes an exhaust pipe, one end of which is connected to the detection host 5 and is responsible for sending the collected air samples to the host for analysis, while the other end is inserted into the high radiation area and can effectively exhaust the processed air samples to maintain air circulation in the area.

[0051] By analyzing and discharging the sampled air back to the high radiation area, continuous monitoring of potential fire risks is ensured, improving the safety of the system. The design of the gas exhaust structure enables the equipment to work normally even in a high radiation environment, providing reliable data support. The structure can adapt to different high radiation conditions, allowing the system to operate effectively in a variety of environments. By discharging the processed air samples back, it helps to reduce the risk of contamination in high radiation areas and keep the environment clean. The fast air sample analysis and discharge mechanism can speed up the response to fire risks, thereby improving the overall safety protection capabilities.

[0052] In one embodiment, see Figure 2 The above-mentioned fire detection system also includes a gas processing structure; one end of the gas processing structure is connected to the air intake structure; and the other end of the gas processing structure is connected to the detection host 5.

[0053] In one embodiment, see Figure 2 The above-mentioned gas processing structure includes a filter, and the filter is connected to the detection host 5.

[0054] In one embodiment, see Figure 2 The above-mentioned gas processing structure also includes a purge device 2, one end of the purge device 2 is connected to the suction pump; the other end of the purge device 2 is connected to the filter.

[0055] In one embodiment, the gas processing structure further includes a water collecting structure, and the water collecting structure is connected between the purge device 2 and the filter.

[0056] The extracted air first passes through the filter. Here, the filter removes larger particles and impurities to avoid interference with subsequent detection; at a specific time, the purge device 2 will start to blow air to the filter to remove the sediment on its surface. This process helps to maintain the cleanliness and sensitivity of the filter, thereby improving the reliability of the detector; the water collection structure is located between the purge device 2 and the filter to collect moisture that may be generated by humid air. This prevents the influence of moisture on detection performance and reduces the risk of false alarms; the air after gas treatment is finally sent to the detection host 5, which analyzes its composition to determine whether there are signs of fire. If suspicious smoke or gas concentrations are detected, the system will trigger an alarm.

[0057] The detector can provide extremely early warning, timely detect potential smoldering fire threats, and improve safety; due to the effective air handling system, the detector can reduce false alarms and improve detection reliability; it is suitable for various environments, including humid and dusty areas, and can maintain stable performance; continuous extraction and analysis of air enables the detection system to monitor fire risks at any time and enhance emergency response capabilities; after filtering and purging, the need for frequent equipment maintenance is reduced, reducing long-term operation and maintenance costs.

[0058] Through this series of processing steps, the fire detection system can efficiently and accurately monitor fire risks and respond in a timely manner.

[0059] In one embodiment, see Figure 1 , the number of the above-mentioned detection hosts 5 is at least 2.

[0060] In one embodiment, see Figure 2 Each of the above-mentioned detection hosts 5 is connected to at least two air suction structures.

[0061] The system is configured with at least two detection hosts 5 to achieve redundancy design. When one host fails, the other host can immediately take over the monitoring task to ensure that the system is always in operation.

[0062] Each detection host 5 is connected to at least two suction structures, which are used to extract air samples from the monitored area. The suction structures deliver ambient air to the host for analysis to detect the presence of smoke particles.

[0063] The detection host 5 monitors the smoke particles in the sampled air in real time. When the smoke concentration reaches a certain threshold, the system will issue a warning or alarm signal.

[0064] The redundant design ensures that the system can still work normally when any host fails, which improves the reliability of fire detection. The configuration of multiple suction structures enables the system to cover the monitoring area more comprehensively and detect potential fire risks in time, thereby achieving early intervention and reducing fire losses. This configuration allows the position of the suction structure to be flexibly adjusted according to different environmental requirements, improving the accuracy of detection. The redundant system design facilitates regular maintenance and overhaul, and operation and maintenance personnel can work without affecting the overall monitoring capability.

[0065] The combination of multiple detection hosts 5 and air suction structures can be integrated with other security systems (such as fire extinguishing systems and surveillance cameras) to form a comprehensive security protection network.

[0066] Specifically, the system is configured with two sets of detection hosts 5 to ensure that when one fails, the other can take over in time, thereby ensuring that important equipment is always under monitoring.

[0067] Normally, one detection host 5 is responsible for daily monitoring. When it fails, the system automatically switches to the backup host to maintain continuous fire detection capabilities.

[0068] When the main control room receives a fire alarm signal, the staff will confirm the scene with the closed-circuit television system in the reactor coolant pump area. This double confirmation mechanism improves the accuracy of the fire alarm.

[0069] Each detection host 5 has early warning, alarm and fault functions, and can sample smoke particles in the air in real time. When the smoke concentration reaches the early warning level, the operation and maintenance personnel will immediately check the potential fire risk; if the concentration continues to rise and reaches the alarm threshold, the fire alarm will be triggered.

[0070] Each detection host 5 is configured with a main pipeline and redundant pipelines to ensure that the detector can effectively sample at different locations, thereby improving the comprehensiveness and accuracy of monitoring.

[0071] This system design not only enhances the reliability of fire detection, but also provides sufficient guarantee for rapid response to fire risks, ensuring the safe operation of nuclear power plants.

[0072] In summary, this design not only enhances the reliability and response speed of fire detection, but also provides a higher level of safety for important facilities such as nuclear power plants.

[0073] In one embodiment, see Figure 3 The above-mentioned fire detection system also includes a power supply unit, which is connected to the aspirating smoke detector 100.

[0074] In one embodiment, see Figure 3A fire detection system further includes a fault switching component, the number of the aspirating smoke detectors 100 is at least two, and the fault switching component is connected between the power supply unit and the aspirating smoke detectors 100.

[0075] In this embodiment, the aspirating smoke detector 100 used in the nuclear power plant is powered by two 220V AC power supplies, and the power supply can be switched. The aspirating smoke detector 100 is a 1+1 redundant setting, and there are three switching modes, namely automatic, on-site manual and remote manual in the main control room. When one unit fails, it automatically switches to the other unit for operation.

[0076] In one embodiment, see Figure 3 The power supply unit includes a positive pole and a negative pole, and the fault switching component includes a switching relay, a normal relay, a normal contact, a fault relay and a fault contact. The normal contact is connected to the positive pole of the power supply unit; the normal relay is connected to the normal contact, and the normal relay is connected to one of the aspirating smoke detectors 100; the other end of the normal contact is connected to the fault contact; the fault contact is connected to the fault relay; the other end of the fault contact is connected to the switching relay; the switching relay is connected to another aspirating smoke detector 100.

[0077] Specifically, see Figure 3 , in normal operation: When one of the aspirating smoke detectors 100 is in normal working state, a working power signal is sent. The signal is energized to the normal relay 1XR by some means (such as direct connection or other circuit processing).

[0078] When the normal relay 1XR is energized, its normal contact, i.e. the normally closed contact, will open. This is usually used to cut off the circuit related to fault handling to ensure that the fault handling process is not mistakenly triggered during normal operation.

[0079] At the same time, other related relays (such as fault relay 2XR, switching relay 3XR, etc., depending on the circuit design) will also be in a specific state to maintain the normal operation of the entire system.

[0080] When a fault occurs: When a fault occurs in the aspirating smoke detector 100, a fault signal is sent.

[0081] The fault signal causes the normal relay 1XR to lose power, causing its normal contacts, i.e., the normally closed contacts, to close.

[0082] The closing of the normally closed contact will trigger a series of fault handling actions, such as starting the fault indicator light, sending a fault alarm signal, etc.

[0083] At the same time, according to the circuit design, the backup device, namely another aspirating smoke detector 100, will be started by switching the relay 3XR to ensure the continuous operation of the system.

[0084] The fault handling process also involves the use of delay relays to achieve delay or timing control of fault handling.

[0085] Reset and switch: The fault indicator light and reset button 1TC are used to indicate the fault status and provide a manual reset function. When the fault is eliminated, the circuit can be reset by pressing the reset button to restore the system to normal working state. The switch function allows the device to be switched manually or automatically when necessary to achieve system redundancy and reliability.

[0086] The system of this embodiment effectively reduces operation and maintenance and labor costs by reducing the frequency of maintenance. In addition, it can effectively protect personnel and reduce their risk of exposure to radiation doses. The aspirating smoke detector 100 has high sensitivity and accuracy, and can achieve early judgment and prevention of fires. The redundant design ensures continuous monitoring of important equipment in nuclear power plants and improves the reliability of the system. The single tube length of the sampling tube 1 can reach 100 meters, allowing the equipment of a main pump to be effectively monitored across multi-story buildings. The configuration of redundant devices can support comprehensive detection capabilities in the case of a single main pump.

[0087] The system's redundant design and high sensitivity allow fire risks to be identified earlier, allowing timely response measures to be taken. Through efficient design, the demand for manpower and material resources is reduced, making operations more economical. The system can adapt to complex building structures and achieve wider coverage and monitoring.

[0088] This system design not only improves the safety and efficiency of nuclear power plants, but also provides great convenience for maintenance and management.

[0089] The above-mentioned fire detection system is provided with an aspirating smoke detector 100, which includes an aspirating structure and a detection host 5. The detection is performed by continuously sucking air samples, which avoids direct exposure to a high-radiation environment. The aspirating design avoids frequent physical contact and the use of moving parts. A redundant design is adopted, so that even if some components fail, other components can continue to work, thereby solving the problem of high failure rate and low reliability of point-type smoke detectors, flame detectors, temperature sensors, etc. installed in high-radiation areas of reactor coolant pumps.

[0090] In one embodiment, a working method performed by the above-mentioned fire detection system is also provided, comprising:

[0091] The air sample in the high radiation area is extracted by the air suction structure, and the smoke concentration in the air sample is analyzed by the detection host 5 to determine the fire situation.

[0092] It should be noted that those skilled in the art can clearly understand that the specific implementation process of the working method performed by the above-mentioned fire detection system can refer to the corresponding description in the aforementioned fire detection system embodiment, and for the convenience and brevity of description, it will not be repeated here.

[0093] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A fire detection system, characterized in that: include: An aspirating smoke detector comprises an aspirating structure and a detection host, wherein the aspirating structure is connected to the detection host; one end of the aspirating structure is inserted in a high radiation area.

2. A fire detection system according to claim 1, characterized in that: The air suction structure includes a sampling tube and an air suction pump. One end of the sampling tube is inserted in the high radiation area, and the other end of the sampling tube is connected to the air suction pump. The air suction pump is connected to the detection host.

3. A fire detection system according to claim 2, characterized in that: It also includes a gas exhaust structure, one end of which is connected to the detection host; the other end of the gas exhaust structure is inserted into the high radiation area.

4. A fire detection system according to claim 3, characterized in that: The gas exhaust structure comprises an exhaust pipe; one end of the exhaust pipe is connected to the detection host; and the other end of the exhaust pipe is inserted into the high radiation area.

5. A fire detection system according to claim 4, characterized in that: It also includes a gas processing structure; one end of the gas processing structure is connected to the air intake structure; the other end of the gas processing structure is connected to the detection host.

6. A fire detection system according to claim 5, characterized in that: The gas processing structure includes a filter, and the filter is connected to the detection host.

7. A fire detection system according to claim 6, characterized in that: The gas processing structure further comprises a purge device, one end of which is connected to the air suction pump; and the other end of which is connected to the filter.

8. A fire detection system according to claim 1, characterized in that: The number of the detection hosts is at least 2.

9. A fire detection system according to claim 1, characterized in that: Each of the detection hosts is connected to at least two of the air suction structures.

10. A fire detection system according to claim 1, characterized in that: It also includes a power supply unit, which is connected to the aspirating smoke detector.

11. A fire detection system according to claim 10, characterized in that: It also includes a fault switching component. The number of the aspirating smoke detectors is at least two, and the fault switching component is connected between the power supply unit and the aspirating smoke detectors.

12. A fire detection system according to claim 11, characterized in that: The power supply unit includes a positive pole and a negative pole, and the fault switching component includes a switching relay, a normal relay, a normal contact, a fault relay and a fault contact. The normal contact is connected to the positive pole of the power supply unit; the normal relay is connected to the normal contact, and the normal relay is connected to one of the aspirating smoke detectors; the other end of the normal contact is connected to the fault contact; the fault contact is connected to the fault relay; the other end of the fault contact is connected to the switching relay; and the switching relay is connected to another aspirating smoke detector.

13. A working method performed by the fire detection system according to any one of claims 1 to 12, characterized in that: include: The air suction structure is used to extract air samples from high radiation areas, and the smoke concentration in the air samples is analyzed by the detection host to determine the fire situation.

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