Multi-stage control method for ceiling screen of composite air wall

Abstract

The invention relates to a multi-stage control method for a composite air wall smoke-blocking vertical wall, which is characterized in that the composite air wall smoke-blocking vertical wall is mounted on an underground space ceiling and comprises an air storage bin, a smoke-blocking vertical wall section I and a smoke-blocking vertical wall section II which are communicated with one another from top to bottom; smoke sensors and temperature sensors are arranged in the underground space in different regions; the sensor acquires information, transmits the information to a fire alarm controller of a fire control room, and sends a control instruction of a corresponding level to the PLC according to the field acquired information; and the PLC controls the air compressor and the sliding rail assembly to operate according to the received control instruction, and the composite air wall smoke-blocking vertical wall descends to the height of the corresponding level. According to the invention, the dual functions of physical blocking of the solid vertical wall and airflow blocking of the air wall are combined, so that the smoke blocking capability is improved, the lowering height of the smoke-blocking vertical wall can be flexibly controlled in a segmented manner according to different fire stages, and the automation and intelligence levels are effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building disaster prevention, and in particular relates to a multi-stage control method for a composite air wall smoke-blocking vertical wall. BACKGROUND

[0002] Traffic hubs and their transit spaces are the most public and densely populated underground spaces, including subway stations (platforms, station halls), underground pedestrian passages, etc. When a fire occurs in an underground space, smoke diffusion is one of the primary factors threatening personnel safety. Due to the lack of natural ventilation, smoke will quickly accumulate and spread horizontally along the ceiling, forming a stable smoke flow layer. These smokes not only contain a large amount of toxic substances, but also significantly reduce visibility, making it difficult for personnel to identify escape directions and exits. At the same time, high-temperature smoke during diffusion may cause "chimney effect", further accelerating the spread speed, and even causing secondary disasters such as flashover. Deploying a smoke-blocking vertical wall can form a smoke storage warehouse at the top of the underground space, block the horizontal spread of smoke, and limit it to the area where the fire occurs, buying time for personnel evacuation.

[0003] However, the widely used smoke-blocking vertical wall structure still has obvious deficiencies in dealing with such risks. On the one hand, traditional smoke-blocking vertical walls are mostly fixed in design, with limited lowering height and coverage range, making it difficult to adjust flexibly according to the fire and smoke diffusion situation, resulting in less than ideal smoke control effect. On the other hand, the existing system generally lacks automated and intelligent control capabilities, cannot efficiently link with fire alarm systems or intelligent sensors, and still relies on manual judgment and operation, which is slow and easily affected by site conditions.

[0004] Therefore, it is necessary to propose new measures to overcome the above-mentioned deficiencies. SUMMARY

[0005] The purpose of the present application is to provide a multi-stage control method for a composite air wall smoke-blocking vertical wall to solve the problem that the existing smoke-blocking vertical wall cannot flexibly adjust the lowering height and lacks automated and intelligent control capabilities.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present application is:

[0007] A multi-stage control method for a composite air wall smoke-blocking vertical wall is provided, the method comprising:

[0008] The composite air wall smoke screen is installed on the ceiling of the underground space, and comprises a gas storage room, a first smoke screen section and a second smoke screen section from top to bottom, which are connected with each other. The air compressor is installed on the side of the gas storage room to send high-pressure air to the gas storage room. The second smoke screen section is located in the first smoke screen section and is connected with the first smoke screen section through the slide rail assembly between the sides. The second smoke screen section moves up and down in the first smoke screen section. The second smoke screen section is provided with a gas nozzle at the bottom. The air compressor and the slide rail assembly are both provided with driving motors, which are controlled by the PLC controller.

[0009] The sensors, including smoke sensors and temperature sensors, are arranged in the underground space in different areas.

[0010] The information collected by the sensors is connected to the fire alarm controller on site through the special bus for fire fighting. After excluding false alarms, the alarm signal is transmitted to the fire alarm controller in the control room. The fire alarm controller in the control room sends control instructions of corresponding levels to the PLC controller according to the thickness of the smoke layer.

[0011] The PLC controller controls the air compressor and the slide rail assembly to operate according to the received control instructions, and lowers the composite air wall smoke screen to the height of the corresponding level.

[0012] Further, in the same area, two sensors or two different types of sensors simultaneously collect abnormal information, and the fire alarm controller on site determines that the situation at this time is a real fire, that is, false alarms are excluded.

[0013] Further, the information collected by the smoke sensor is the concentration of smoke particles in the air. When the concentration of smoke particles in the air exceeds 0.65% obs / m, it is determined to be abnormal.

[0014] The information collected by the temperature sensor is the temperature of the air. When the temperature of the air exceeds 57°C or the temperature rises by more than 10°C / min, it is determined to be abnormal.

[0015] Further, the thickness of the smoke layer is calculated by the minimum clear height of the smoke layer and the net height of the underground space.

[0016] ;

[0017] ;

[0018] Wherein:

[0019] Hg is the thickness of the smoke layer, m;

[0020] Hq is the minimum clear height of the smoke layer, m;

[0021] H is the net height of the underground space, m.

[0022] Further, the distance from the bottom of the first smoke blocking vertical wall to the ceiling of the underground space is H1;

[0023] When Hg≤H1, the fire alarm controller of the control room sends a first control instruction to the PLC controller, and the first smoke blocking vertical wall is used for smoke blocking.

[0024] Further, when the second smoke blocking vertical wall is lowered to the lower limit, the distance from the bottom of the second smoke blocking vertical wall to the ceiling of the underground space is H1+H2;

[0025] When H1

[0026] Further, when the second smoke blocking vertical wall is lowered to the lower limit, the distance from the bottom of the second smoke blocking vertical wall to the ceiling of the underground space is H1+H2;

[0027] When H1

[0028] Further, when the second smoke blocking vertical wall is lowered to the lower limit, the distance from the bottom of the second smoke blocking vertical wall to the ceiling of the underground space is H1+H2;

[0029] When H1

[0030] Further, the top of the gas storage warehouse is provided with a vertical telescopic boom, and the top of the telescopic boom is fixed to the ceiling of the underground space.

[0031] Further, the fire alarm controller of the control room sends a four-level control instruction to the PLC controller, and if the smoke layer thickness Hg continues to increase, the PLC controller controls the telescopic boom to extend downward, and the distance from the bottom of the three sections of the air wall smoke-retaining vertical wall to the top of the underground space is H1+H2+H3+H4.

[0032] Compared with the prior art, the application has the following beneficial effects:

[0033] The application provides a composite air wall smoke-retaining vertical wall multi-level control method, which is different from the control mode of the traditional smoke-retaining vertical wall with fixed height or single threshold triggering, combines the dual functions of physical blocking of the entity vertical wall and air flow plugging of the air wall, improves the smoke blocking capacity, and can flexibly control the lowering height of the smoke-retaining vertical wall according to different fire stages. By deploying sensor equipment such as smoke sensors and temperature sensors on the site, the sensor data is linked with the smoke-retaining height to form a closed-loop logic of "monitoring-computing-control", the site state information is mastered, and the running state of the smoke-retaining vertical wall is adjusted and changed by feeding back to the controller, so that the smoke-retaining effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0035] Figure 1 is a structural diagram of the composite air wall smoke-retaining vertical wall provided by the embodiment of the application.

[0036] Figure 2 is a control method logic diagram provided by the embodiment of the application.

[0037] In the figure, the following are marked:

[0038] 1-Telescopic boom, 2-Gas storage warehouse, 3-Gas pipeline, 4-Air compressor, 5-Pressure monitor, 6-Top plate, 7-Three sections of air wall smoke-retaining vertical wall, 8-Strip-shaped air port baffle, 9-First section of smoke-retaining vertical wall, 10-Second section of smoke-retaining vertical wall, 11-Gas pipeline, 12-Gas nozzle. DETAILED DESCRIPTION

[0039] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0040] In the description of this invention, it should be understood that the terms "upper", "lower", "lateral", "longitudinal", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "setting," etc., should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] Furthermore, in the description of this invention, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. Of course, such terms can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in a sequence other than those illustrated or described herein.

[0043] It should also be noted that although the order of steps is mentioned in the method description, in some cases, steps may be performed in a different order than that described here, and this should not be interpreted as a restriction on the order of steps.

[0044] In a specific implementation, Figure 1 The length direction of the gas storage tank 2 is defined as the transverse direction, and the direction perpendicular to it is defined as the longitudinal direction (that is, the direction of the underground space passage). Figure 1 The direction from top to bottom is defined as vertical.

[0045] This invention provides a multi-level control method for a composite air wall smoke curtain, used to control the operation of the composite air wall smoke curtain in underground spaces to form a vertical, high-efficiency smoke barrier, effectively blocking the spread of smoke during a fire, and the downward extension height can be adjusted in multiple levels.

[0046] The composite air wall smoke curtain integrates the dual functions of a solid curtain and an air wall. Specifically, for example... Figure 1The composite air wall smoke curtain includes an air storage chamber 2, an air compressor 4, a first section of the smoke curtain 9, and a second section of the smoke curtain 10.

[0047] The air storage chamber 2 is a long, rectangular, enclosed box with a rectangular slot at the bottom. The air compressor 4 is an explosion-proof type, located on one side of the air storage chamber 2. An air delivery pipeline 3 is installed at the output end of the air compressor 4, with the end of the pipeline connecting to the air storage chamber 2. Necessary supports can be installed on the ceiling to house the air compressor 4. A pressure monitor 5 can be installed inside the air storage chamber 2 to monitor the internal pressure. The air delivery pipeline 3 is made of stainless steel with a PTFE (polytetrafluoroethylene) anti-corrosion coating, capable of withstanding temperatures above 300℃.

[0048] The smoke curtain section 9 is a box-like structure, with its top fixed to and connected to the bottom of the gas storage chamber 2, and its bottom open. Specifically, the top of the smoke curtain section 9 is open, and its top edge is welded and fixed to the outer periphery of a rectangular slot at the bottom of the gas storage chamber 2, thus connecting to the rectangular slot. A strip-shaped air vent baffle 8 is installed within the rectangular slot. The strip-shaped air vent baffle 8 has evenly spaced strip-shaped grooves, forming strip-shaped air vents, which can serve to even out airflow. The strip-shaped air vent baffle 8 can house a filter and dryer to remove moisture and impurities from the flame-retardant gas, preventing pipe blockage in the high-humidity environment of deep underground spaces.

[0049] The second section 10 of the smoke curtain is also a box structure. The top of the second section 10 has a top plate 6 with multiple through holes arranged at equal intervals laterally. A vertical gas pipe 11, 100-150 mm in diameter and made of seamless steel, is also installed inside the second section 10. The top of the gas pipe 11 connects to the through holes in the top plate 6 of the second section 10. The bottom of the second section 10 is closed and equipped with gas nozzles 12, which are connected to the bottom of the gas pipe 11. The gas nozzles 12 can be spherical nozzles with an outlet air velocity of 10-15 m / s, forming a three-dimensional air wall with a thickness ≥0.15 m. The angle of the nozzles can be used to adjust the inclination of the air wall, blocking smoke from flowing around it.

[0050] The top of the second section 10 of the smoke curtain is inserted upward into the first section 9 of the smoke curtain. The two outer walls of the second section 10 of the smoke curtain and the two inner walls of the first section 9 of the smoke curtain are provided with mutually cooperating slide rail assemblies and equipped with motors, which can control the second section 10 of the smoke curtain to move up and down within the first section 9 of the smoke curtain. Figure 1 The slide rail assembly and its motor are not shown in the paper. The slide rail assembly and its motor are common commercially available equipment products. This application does not make any structural modifications to them. Any equipment product that can achieve the above functions can be used in the implementation of this application.

[0051] In addition, in order to ensure the airtightness of the overall structure and maintain gas pressure, a sealing strip is provided around the bottom of the inner wall of the first section 9 of the smoke curtain. When the second section 10 of the smoke curtain moves up and down within the first section 9, the inner circumference of the sealing strip is tightly attached to the outer wall of the second section 10 of the smoke curtain, and air leaks at the gap. Figure 1 The arrangement of other structures is not affected, and no sealing strip is drawn. It is located at the bottom of the inner wall of section 9 of the smoke curtain.

[0052] A vertical telescopic boom 1 can also be installed on the top of the gas storage chamber 2, with the top of the boom fixed to the ceiling of the underground space. The telescopic boom 1 is also equipped with a motor, which can control the length change, extending or shortening. This application does not make any structural improvements to the telescopic boom 1 and its motor; any equipment that can achieve the above functions can be used in the implementation of this application.

[0053] After the air compressor 4 is started, high-pressure air is delivered into the air storage chamber 2, and passes through the strip-shaped air outlet baffle 8, the gas pipeline 11 and the gas nozzle 12 to form three sections of air wall smoke curtain 7 downwards.

[0054] This invention, based on a solid smoke curtain, allows for flexible, segmented control of the smoke curtain's lowering height according to different fire stages. Simultaneously, by spraying flame-retardant gas to form an air wall, it creates an "airflow buffer zone," effectively preventing smoke from flowing laterally under the ceiling. Compared to traditional smoke curtains, the air wall offers better flexibility and sealing, preventing smoke from bypassing the curtain's edges and reducing smoke escape through gaps. The overall smoke-blocking efficiency is increased to over 90%, making it particularly suitable for deep underground spaces with high smoke pressure.

[0055] Specifically, the aforementioned composite air wall smoke curtain includes the following steps:

[0056] S1: A composite air wall smoke curtain is installed on the ceiling of the underground space, which includes, from top to bottom, interconnected air storage chamber 2, smoke curtain section 9, and smoke curtain section 10; an air compressor 4 is installed on the side of the air storage chamber 2 to supply high-pressure air to the air storage chamber 2; the smoke curtain section 10 is located inside the smoke curtain section 9, and the two are connected by a slide rail assembly between their sides, and the smoke curtain section 10 moves up and down inside the smoke curtain section 9; the bottom of the smoke curtain section 10 has a gas nozzle 12; the air compressor 4 and the slide rail assembly are both equipped with drive motors and controlled by a PLC controller.

[0057] The air storage chamber 2 is also equipped with a pressure monitor 5. The PLC controller controls the operating power of the air compressor 4 based on the information collected by the pressure monitor 5, so that the air storage chamber 2 maintains a stable air pressure and ensures that the pressure is stable at 0.6-1.0MPa.

[0058] S2: Deploy sensors in different zones within the underground space, including smoke sensors and temperature sensors.

[0059] The smoke sensor collects information on the concentration of smoke particles in the air. When the concentration of smoke particles in the air exceeds 0.65% obs / m, it is judged as abnormal.

[0060] The temperature sensor collects information about the air temperature. When the air temperature exceeds 57°C, or when the temperature rises by more than 10°C / min, it is considered abnormal.

[0061] In practical implementation, the smoke sensor can be Haiwan JTY-HM-GST102, and the temperature sensor can be Shengsaier JTW-BCD-ZM2251.

[0062] S3: The sensor collects information and converts it into a standard digital signal (such as an RS485 protocol signal). This signal is then connected to the on-site fire alarm controller (area unit) via a dedicated fire protection bus. After eliminating false alarms, the alarm signal is transmitted to the fire alarm controller in the fire control room. The fire alarm controller in the fire control room sends the corresponding level of control command (24V DC signal) to the PLC controller based on the smoke layer thickness. Simultaneously, alarm information pops up on the display screen in the fire control room.

[0063] If two sensors, or two sensors of different types, simultaneously collect abnormal information within the same area, the on-site fire alarm controller will determine that the situation is a real fire, thus eliminating false alarms.

[0064] S4: The PLC controller controls the operation of the air compressor 4 and the slide rail assembly according to the received control instructions, and the composite air wall smoke curtain descends to the corresponding level of height.

[0065] The thickness of the flue gas layer, which is the distance from the bottom edge of the flue gas layer to the ceiling of the underground space, is calculated using the minimum clear height of the flue gas layer and the net height of the underground space.

[0066] ;

[0067] ;

[0068] in:

[0069] Hg is the thickness of the flue gas layer, in meters;

[0070] Hq is the minimum clear height of the flue gas layer, in meters;

[0071] H represents the net height of the underground space, in meters (m).

[0072] Generally, the temperature of the flue gas layer is significantly higher than that of the air layer. By identifying the temperature abrupt change points / concentration abrupt change points between flue gas and air at the smoke curtain wall, the interface between flue gas and air can be located, thus obtaining the minimum clear height of the flue gas layer. For example, in the horizontal direction, vertical temperature sensors and smoke sensors are arranged 1m away from the smoke curtain wall, with a spacing of 0.5m between the vertical sensors. When the temperature difference between two adjacent vertical sensors is ≥8-12℃ and the smoke concentration difference is ≥2.0-3.0% obs / m, this interval can be determined as the flue gas-air interface, and the minimum clear height Hq is the distance from the lowest sensor position to the ground.

[0073] (1) Level 1 control commands:

[0074] The distance from the bottom of section 9 of the smoke curtain to the ceiling of the underground space is H1.

[0075] When Hg≤H1, the fire alarm controller in the fire control room sends a first-level control command to the PLC controller, and the smoke curtain section 1 (9) blocks the smoke.

[0076] (2) Secondary control commands:

[0077] When the second section 10 of the smoke curtain descends to its lower limit, the distance from the bottom of the second section 10 of the smoke curtain to the ceiling of the underground space is H1 + H2.

[0078] When H1 < Hg ≤ H1 + H2, the fire alarm controller in the fire control room sends a secondary control command to the PLC controller. The PLC controller controls the slide rail assembly to operate, and the second section 10 of the smoke curtain descends below Hg. The first section 9 of the smoke curtain and the second section 10 of the smoke curtain simultaneously block the smoke.

[0079] (3) Level 3 control commands:

[0080] The second section 10 of the smoke curtain is located within the first section (9) of the smoke curtain and does not descend. After the air compressor 4 is started, the high-pressure air passes through the air storage chamber 2 and the first section 9 of the smoke curtain, and is sprayed downward through the gas nozzle 12 to form an air wall, namely the third section 7 of the air wall smoke curtain. The distance from the bottom of the third section 7 of the air wall smoke curtain to the ceiling of the underground space is H1 + H3, where H3 > H2.

[0081] When H1 + H2 < Hg ≤ H1 + H3, the fire alarm controller in the fire control room sends a three-level control command to the PLC controller. The PLC controller controls the air compressor 4 to start, forming three sections of the air wall smoke curtain 7. The smoke curtain section 1 9 and the three sections of the air wall smoke curtain 7 simultaneously block smoke.

[0082] (4) Level 4 quality control instructions:

[0083] After the second section 10 of the smoke curtain descends to its lower limit and the air compressor 4 starts, the high-pressure air passes through the air storage chamber 2, the first section 9 of the smoke curtain, and the second section 10 of the smoke curtain, and is sprayed downward through the gas nozzle 12 to form an air wall, namely the third section 7 of the air wall smoke curtain. The distance from the bottom of the third section 7 of the air wall smoke curtain to the ceiling of the underground space is H1 + H2 + H3.

[0084] When H1 + H3 < Hg ≤ H1 + H2 + H3, the fire alarm controller in the fire control room sends a level 4 control command to the PLC controller. The PLC controller controls the slide rail assembly to operate, and the second section 10 of the smoke curtain descends to the lower limit. The PLC controller controls the air compressor 4 to start, forming the third section 7 of the air wall smoke curtain. The first section 9 of the smoke curtain, the second section 10 of the smoke curtain, and the third section 7 of the air wall smoke curtain simultaneously block smoke.

[0085] In addition, a vertical telescopic boom 1 is installed on the top of the gas storage chamber 2, and the top of the telescopic boom 1 is fixed to the ceiling of the underground space. After the fire alarm controller in the fire control room sends a level four control command to the PLC controller, if the smoke layer thickness Hg continues to increase, the PLC controller controls the telescopic boom 1 to extend downwards. The distance from the bottom of the three sections 7 of the air wall smoke curtain to the ceiling of the underground space is H1 + H2 + H3 + H4, which is the level five control command.

[0086] This invention has advantages in emergency safety assurance. When the device malfunctions and gets stuck unexpectedly (such as motor failure, housing deformation, blockage of slide rail components, etc.), this invention can separately enhance the airflow intensity of the air wall, temporarily replace the physical barrier, avoid completely losing the ability to control smoke, and buy valuable time for the evacuation of underground spaces.

[0087] This invention integrates "physical blocking + airflow sealing" for dual protection, which solves the limitations of existing smoke curtains in terms of spatial adaptability, smoke blocking efficiency and scene flexibility. It can effectively block smoke from flowing laterally under the building ceiling, and has a high degree of automation and intelligence, effectively ensuring the operational safety of underground spaces.

[0088] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. A multi-stage control method for a composite air-wall smoke curtain, characterized in that: The method includes: A composite air wall smoke curtain is installed on the ceiling of the underground space. From top to bottom, it includes an interconnected air storage chamber (2), a first smoke curtain section (9), and a second smoke curtain section (10). An air compressor (4) is installed on the side of the air storage chamber (2) to deliver high-pressure air to the air storage chamber (2). The second smoke curtain section (10) is located inside the first smoke curtain section (9). The two are connected by a slide rail assembly between their sides. The second smoke curtain section (10) moves up and down inside the first smoke curtain section (9). The bottom of the second smoke curtain section (10) has a gas nozzle (12). The air compressor (4) and the slide rail assembly are both equipped with drive motors and controlled by a PLC controller. Sensors, including smoke sensors and temperature sensors, are deployed in different zones within the underground space. The sensor collects information and connects to the fire alarm controller on site via a dedicated fire protection bus. After eliminating false alarms, the alarm signal is transmitted to the fire alarm controller in the fire control room. The fire alarm controller in the fire control room sends the corresponding level of control command to the PLC controller according to the thickness of the smoke layer. The PLC controller controls the operation of the air compressor (4) and slide rail assembly according to the received control instructions, so as to lower the composite air wall smoke curtain to the corresponding level of height.

2. The multi-stage control method for the composite air wall smoke curtain according to claim 1, characterized in that: If two sensors, or two sensors of different types, simultaneously collect abnormal information within the same area, the on-site fire alarm controller will determine that the situation is a real fire, thus eliminating false alarms.

3. The multi-stage control method for the composite air wall smoke curtain according to claim 2, characterized in that: The smoke sensor collects information on the concentration of smoke particles in the air. When the concentration of smoke particles in the air exceeds 0.65%obs / m, it is judged as abnormal. The temperature sensor collects information about the air temperature. When the air temperature exceeds 57°C, or when the temperature rises by more than 10°C / min, it is considered abnormal.

4. The multi-stage control method for the composite air wall smoke curtain according to claim 3, characterized in that: The thickness of the flue gas layer is calculated using the minimum clear height of the flue gas layer and the net height of the underground space. ； ； in: Hg is the thickness of the flue gas layer, in meters; Hq is the minimum clear height of the flue gas layer, in meters; H represents the net height of the underground space, in meters (m).

5. The multi-stage control method for the composite air wall smoke curtain according to claim 4, characterized in that: The distance from the bottom of section (9) of the smoke curtain to the ceiling of the underground space is H1; When Hg≤H1, the fire alarm controller in the fire control room sends a first-level control command to the PLC controller to use the smoke curtain section 1 (9) to block the smoke.

6. The multi-stage control method for the composite air wall smoke curtain according to claim 5, characterized in that: When the second section (10) of the smoke curtain descends to the lower limit, the distance from the bottom of the second section (10) of the smoke curtain to the ceiling of the underground space is H1 + H2; When H1<Hg≤H1+H2, the fire alarm controller in the fire control room sends a secondary control command to the PLC controller. The PLC controller controls the slide rail assembly to operate, and the second section (10) of the smoke curtain drops below Hg. The first section (9) of the smoke curtain and the second section (10) of the smoke curtain simultaneously block the smoke.

7. The multi-stage control method for the composite air wall smoke curtain according to claim 6, characterized in that: The second section (10) of the smoke curtain is located within the first section (9) of the smoke curtain and does not descend. After the air compressor (4) is started, the high-pressure air passes through the air storage chamber (2) and the first section (9) of the smoke curtain, and is sprayed downward through the gas nozzle (12) to form an air wall, namely the third section (7) of the air wall smoke curtain. At this time, the distance from the bottom of the third section (7) of the air wall smoke curtain to the ceiling of the underground space is H1 + H3, where H3 > H2. When H1 + H2 < Hg ≤ H1 + H3, the fire alarm controller in the fire control room sends a three-level control command to the PLC controller. The PLC controller controls the air compressor (4) to start, forming three sections of the air wall smoke curtain (7). The smoke curtain section 1 (9) and the three sections of the air wall smoke curtain (7) simultaneously block smoke.

8. The multi-stage control method for the composite air wall smoke curtain according to claim 7, characterized in that: After the second section (10) of the smoke curtain descends to the lower limit and the air compressor (4) starts, the high-pressure air passes through the air storage chamber (2), the first section (9) of the smoke curtain, and the second section (10) of the smoke curtain, and is sprayed downward through the gas nozzle (12) to form an air wall, namely the third section (7) of the air wall smoke curtain. The distance from the bottom of the third section (7) of the air wall smoke curtain to the ceiling of the underground space is H1+ H2+H3. When H1 + H3 < Hg ≤ H1 + H2 + H3, the fire alarm controller in the fire control room sends a level 4 control command to the PLC controller. The PLC controller controls the slide rail assembly to run, and the second section (10) of the smoke curtain descends to the lower limit. The PLC controller controls the air compressor (4) to start, forming the third section (7) of the air wall smoke curtain. The first section (9), the second section (10), and the third section (7) of the air wall smoke curtain simultaneously block smoke.

9. The multi-stage control method for the composite air wall smoke curtain according to claim 8, characterized in that: The top of the gas storage tank (2) is equipped with a vertical telescopic boom (1), and the top of the telescopic boom (1) is fixed to the ceiling of the underground space.

10. The multi-stage control method for the composite air wall smoke curtain according to claim 9, characterized in that: After the fire alarm controller in the fire control room sends a level 4 control command to the PLC controller, if the smoke layer thickness Hg continues to increase, the PLC controller controls the telescopic rod (1) to extend downwards, and the distance from the bottom of the three sections (7) of the air wall smoke curtain to the ceiling of the underground space is H1+H2+H3+H4.

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