Air pipe fireproof plugging device combined by wedge-shaped clamping groove frame

Abstract

The invention relates to the technical field of air pipe fire prevention, in particular to an air pipe fireproof plugging device combined by wedge-shaped clamping groove frames. Comprising stainless steel heat preservation cotton which is arranged on one side of a fire bearing face of the through-wall air duct and used for preventing fire spreading; the detection device comprises a thermocouple type temperature sensor and a smoke sensor which are used for detecting the indoor environment temperature and the smoke concentration in the indoor environment, and a displacement sensor used for detecting the thermal deformation of the through-wall air pipe; the air velocity sensor and the air flow sensor are used for detecting the flowing state of air in the through-wall air pipe; and the cooperative control module is connected with the detection device and comprises a data acquisition module, a data analysis module, an execution module, a strategy regulation and control module and an optimization module. The problem that effective plugging of the air pipe fireproof plugging device on the air pipe is affected in different stages of a fire disaster is solved.

Description

Technical Field

[0001] This invention relates to the field of duct fireproofing technology, and in particular to a duct fireproof sealing device composed of a wedge-shaped slot frame. Background Technology

[0002] In modern building fire protection systems, fire-stopping penetrating ducts is a crucial step in preventing the spread of fire. Traditional fire-stopping devices generally employ passive structural designs, such as expanded graphite or ceramic fiber sealing materials, which have significant technical drawbacks: Response delay and misjudgment issues: Existing devices mostly rely on a single temperature threshold to trigger sealing, but initial fires are often accompanied by an initial increase in smoke concentration followed by a slow rise in temperature. By the time the temperature sensor reaches the preset threshold, the smoke has already spread to adjacent areas through the ductwork, leading to delayed sealing or misjudgment.

[0003] Risk of thermal deformation failure: Metal ducts undergo thermal expansion under the high temperatures of a fire, resulting in an increase in duct diameter. Traditional rigid sealing structures cannot adapt to this deformation, leading to a decrease in sealing efficiency of over 60% after gaps are created, allowing high-temperature smoke to leak directly.

[0004] The influence of airflow dynamics is ignored: The thermal pressure effect caused by a fire accelerates the airflow in the duct. Existing sealing devices do not take into account the driving effect of airflow on smoke diffusion. Static sealing strategies have a failure rate of up to 40% under high-speed airflow and cannot optimize the sealing strength in real time according to changes in the flow field.

[0005] Simplified control strategy: The current system only performs a binary operation of "fully open / fully closed". Excessive blocking will block the normal ventilation system and cause secondary hazards (such as the accumulation of toxic gases); while blocking the entire area in the event of a local fire is a waste of resources and violates the zoning control principle of GB 50016-2014 "Code for Fire Protection Design of Buildings".

[0006] Chinese Patent Publication No. CN119594246A discloses a pneumatic automatic fireproof sealing device for air ducts, belonging to the technical field of building fire protection equipment. The device includes a support frame, a fireproof sealing plate, a sealing mechanism for driving the fireproof sealing plate, a fixed air duct, a movable air duct, and a movable air duct extension mechanism for driving the movable air duct. The fixed air duct, with a diameter larger than the fixed air duct diameter, is fitted onto the fixed air duct in reverse order of the air pressure flow direction. The movable air duct, with a diameter larger than the fixed air duct diameter, is fitted onto the fixed air duct. The funnel structure at the front end of the movable air duct, with a diameter smaller than the air duct diameter, is inserted into the air duct. The movable air duct is then sequentially connected to the wall-mounted air duct in the same direction of air pressure flow. The fireproof sealing plate can be inserted into the gap between the funnel structure at the front end of the movable air duct and the air duct. The extension and retraction of the movable air duct allows for the sealing and opening of the funnel structure at the front end of the air duct through a gap of a certain width. The fireproof sealing plate, inserted into the gap, separates the building opening from the air duct, effectively sealing the building opening and achieving a fire-resistant separation effect.

[0007] Therefore, it can be seen that the pneumatic automatic fireproof sealing device for air ducts has the problems of failing to address the decrease in sealing caused by thermal deformation of the air duct due to heat, and ignoring the impact of the dynamic flow of air inside the air duct on the fireproof and smoke blocking effect when the sealing decreases. Summary of the Invention

[0008] To address this, the present invention provides a fireproof sealing device for air ducts composed of a wedge-shaped slot frame, which overcomes the problems in the prior art that cannot address the decrease in sealing caused by thermal deformation of the air duct due to heat, and ignores the dynamic flow effect of the airflow inside the air duct when the sealing decreases, thus affecting the fireproof and smoke blocking effect.

[0009] To achieve the above objectives, the present invention provides a fireproof sealing device for air ducts composed of a wedge-shaped slot frame assembly. It includes: The sealing component includes stainless steel insulation cotton disposed on the fire-receiving side of the through-wall duct to prevent the spread of fire, and several wedge-shaped components are provided at the interface of the stainless steel insulation cotton. A wedge-shaped assembly includes a wedge-shaped groove disposed at the interface of the stainless steel insulation cotton, and a wedge-shaped protrusion disposed at the interface and inserted in conjunction with the wedge-shaped groove to stabilize the stainless steel insulation cotton. The detection device includes a thermocouple temperature sensor and a smoke sensor for detecting indoor ambient temperature and smoke concentration in the indoor environment, a displacement sensor for detecting the thermal deformation of the through-wall duct, and an air velocity sensor and an air flow sensor for detecting the air flow state inside the through-wall duct. A collaborative control module, connected to the detection device, includes: The data acquisition module is used to acquire indoor environmental parameters, duct heat deformation parameters, and air flow state inside the duct detected by the thermocouple temperature sensor, the smoke sensor, the displacement sensor, the air velocity sensor, and the air flow sensor. The data analysis module is used to determine whether the current indoor environment is in an abnormal state based on the smoke concentration detected by the smoke sensor in the indoor environment during the initial sampling period. An execution module is used to determine, based on the rate of temperature rise in the indoor environment detected by the thermocouple temperature sensor during the initial sampling period, whether to activate the sealing device installed in one of the through-wall ducts and to perform the sealing. The strategy control module is used to determine the percentage of the number of sealing devices that open the expansion section relative to the total number of devices based on the relative displacement change between the through-wall duct and the stainless steel insulation cotton detected by the displacement sensor, and to control the sealing mode accordingly. An optimization module is used to optimize the sealing device by determining the percentage of the number of open sealing devices to be optimized based on the airflow efficiency index detected by the air velocity sensor and the air flow sensor in the through-wall duct.

[0010] Furthermore, the data analysis module determines that the current indoor environment is in an abnormal state based on the smoke concentration in the indoor environment detected by the smoke sensor within the initial sampling period being greater than the smoke concentration threshold.

[0011] Furthermore, when the indoor environment is in an abnormal state, the execution module determines that the execution part will activate the first sealing mode of the sealing device installed in several through-wall ducts based on the fact that the temperature rise rate in the indoor environment detected by the thermocouple temperature sensor within the initial sampling period is less than or equal to a preset temperature rise rate.

[0012] Furthermore, when the indoor environment is in an abnormal state, the execution module determines that the second sealing mode of the sealing device installed in several through-wall ducts is activated based on the fact that the temperature rise rate in the indoor environment detected by the thermocouple temperature sensor during the initial sampling period is greater than the preset temperature rise rate. Furthermore, the initial sampling duration is the time interval from the start of sampling to the end of sampling, which is 60 seconds.

[0013] Furthermore, when the through-wall duct is deformed by heat, the strategy control module determines the percentage of the number of sealing devices to be opened in the increased portion out of the total number based on whether the relative displacement change between the through-wall duct and the stainless steel insulation cotton detected by the displacement sensor is less than or equal to a preset relative displacement change, and controls the sealing mode accordingly.

[0014] Furthermore, when the through-wall duct is deformed by heat, the strategy control module determines the percentage of the number of sealing devices that will be opened in the increased portion relative to the total number of devices based on the relative displacement change between the through-wall duct and the stainless steel insulation cotton detected by the displacement sensor being greater than a preset relative displacement change, and controls the sealing mode accordingly.

[0015] Furthermore, the optimization module optimizes the sealing device by determining the initial sampling time for shortening the sealing device based on the airflow efficiency index detected by the air velocity sensor and the air flow sensor being less than or equal to a preset airflow efficiency index.

[0016] Furthermore, the optimization module determines to optimize the blocking device by shortening the sampling time of the blocking device and increasing the percentage of the number of open blocking devices to the total number, based on the fact that the air flow efficiency index detected by the air velocity sensor and the air flow sensor in the through-wall duct is greater than the preset air flow efficiency index.

[0017] Furthermore, the stainless steel insulation cotton is composed of two layers.

[0018] Compared with existing technologies, the beneficial effects of this invention are that it utilizes multiple sensors and multi-module collaborative control, taking advantage of the characteristic that smoke takes precedence over flames during a fire. By using smoke sensors and thermocouple temperature sensors to perform dual detection of the indoor environment to determine whether there are any abnormalities, it avoids the slow and inaccurate response problems caused by the single detection of traditional devices. In addition, by combining the subsequent decrease in the sealing performance of the pipeline due to heat deformation and the obvious air flow characteristics in the duct caused by the decrease in sealing performance, the corresponding working mode is adjusted and optimized, which can ensure that the fireproof sealing of the duct is effective for a long time in the fire scene.

[0019] Furthermore, this invention constructs a dual-criteria fire identification mechanism by collaboratively analyzing both smoke concentration and temperature rise rate. Compared to traditional single-temperature sensor or smoke sensor solutions, this mechanism can capture the characteristic that smoke rises significantly before temperature in the early stages of a fire, greatly advancing the timing of abnormal state identification. Combined with an initial sampling period of 60 seconds, the system can trigger early warning and containment actions in the initial stage of a fire, gaining valuable time for personnel evacuation and fire fighting, and solving the pain point of slow response in existing technologies.

[0020] Furthermore, by combining the environmental parameters detected by various sensors during a fire to respond to an appropriate working mode, compared to the traditional "fully open and fully closed" working modes, this invention can adopt a partial blocking mode in the case of a small-scale fire, and further improve the blocking level in the case of a large-scale fire. It can effectively prevent the spread of fire in the early stage, avoid the impact of excessive blocking on the normal ventilation system of the building, and reduce the risk of system shutdown due to false alarms, thus achieving a balance between safety and economy.

[0021] Furthermore, by detecting and analyzing the relative displacement changes caused by the thermal deformation of the duct, this invention can promptly activate more sealing devices when high-temperature smoke leaks due to decreased sealing caused by the thermal deformation of the sealing device close to the fire source. This effectively controls the leaked high-temperature smoke within the duct and prevents it from spreading into the room, ensuring the integrity of the multi-device sealing under high-temperature conditions in the fire scene and effectively preventing the leakage and spread of high-temperature smoke.

[0022] Furthermore, this invention addresses the issue of airflow phenomena within the duct due to decreased sealing caused by heat deformation. By combining airflow velocity and airflow rate to describe the airflow state and formulating corresponding optimization strategies, it can effectively block the "chimney effect" caused by fire thermal pressure. This significantly reduces the risk of high-speed airflow carrying smoke and flames to non-fire areas, thus overcoming the shortcomings of existing technologies that neglect the influence of airflow. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the fireproof sealing device for air ducts using a wedge-shaped slot frame assembly, as described in an embodiment of the present invention. Figure 2 This is a schematic diagram of the stainless steel insulation cotton in the duct fireproof sealing device of the wedge-shaped slot frame assembly according to an embodiment of the present invention; Figure 3 This is an enlarged view of part A of the fireproof sealing device for air ducts with a wedge-shaped slot frame assembly according to an embodiment of the present invention: Figure 4 This is a block diagram showing the module connection of the fireproof sealing device for the ductwork composed of a wedge-shaped slot frame according to an embodiment of the present invention. Figure 5 This is a diagram illustrating the determination of whether the indoor environment is in an abnormal state based on smoke concentration, according to an embodiment of the present invention. Figure 6 This is a judgment diagram for determining the corresponding working mode and performing the blocking based on the temperature rise rate in an embodiment of the present invention; Figure 7 This is a judgment diagram illustrating the determination of the corresponding control strategy based on the relative displacement change in an embodiment of the present invention. Figure 8This is a judgment diagram for determining the corresponding optimization strategy based on the airflow efficiency index in an embodiment of the present invention; In the diagram, 1 - through-wall duct, 2 - through-wall sleeve for duct, 3 - stainless steel insulation cotton, 4 - wall, 5 - wedge-shaped groove, 6 - thermocouple temperature sensor, 7 - smoke sensor, 8 - air velocity sensor, 9 - air flow sensor, 10 - wedge-shaped groove, 11 - wedge-shaped protrusion. Detailed Implementation

[0024] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0025] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0026] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0027] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] Please see Figures 1 to 4 As shown, Figure 1 This is a schematic diagram of the fireproof sealing device for air ducts using a wedge-shaped slot frame assembly, as described in an embodiment of the present invention. Figure 2 This is a schematic diagram of the stainless steel insulation cotton in the duct fireproof sealing device of the wedge-shaped slot frame assembly according to an embodiment of the present invention; Figure 3 This is an enlarged view of part A of the fireproof sealing device for air ducts with a wedge-shaped slot frame assembly according to an embodiment of the present invention: Figure 4 This is a block diagram showing the module connection of the fireproof sealing device for the ductwork using a wedge-shaped slot frame assembly, according to an embodiment of the present invention.

[0029] The fireproof sealing device for air ducts based on the wedge-shaped slot frame assembly of this invention includes: The sealing device includes stainless steel insulation cotton 3 installed on the fire-receiving side of the through-wall duct 1 to prevent the spread of fire. The stainless steel insulation cotton 3 is composed of two layers, with a stainless steel frame on the outer layer and several wedge-shaped components at the interface 5. The wedge-shaped assembly includes a pair of wedge-shaped grooves 10 located at the interface 5 of the upper and lower structures, at the end of the stainless steel frame of the outer layer of the stainless steel insulation cotton, and a pair of wedge-shaped protrusions 11 located at the interface 5 of the upper and lower structures, which cooperate with the wedge-shaped grooves and are inserted into the wedge-shaped grooves to stabilize the stainless steel insulation cotton.

[0030] The detection device includes a thermocouple temperature sensor 6 and a smoke sensor 7 fixedly installed on the indoor side of the through-wall duct 1 for detecting the indoor ambient temperature and the smoke concentration in the indoor environment; a displacement sensor (not shown in the figure) fixedly installed on the inner surface of the through-wall duct for detecting the thermal deformation of the through-wall duct; and an air velocity sensor 8 and an air flow sensor 9 fixedly installed inside the through-wall duct for detecting the air flow state inside the through-wall duct. A collaborative control module, connected to the detection device, includes: The data acquisition module is connected to the detection device to acquire indoor environmental parameters, duct heat deformation parameters, and air flow conditions inside the duct detected by the thermocouple temperature sensor, the smoke sensor, the displacement sensor, and the air flow sensor. The data analysis module, which is connected to the data acquisition module, is used to determine whether the current indoor environment is in an abnormal state based on the smoke concentration detected by the smoke sensor in the indoor environment within the initial sampling period. An execution module, which is connected to the data acquisition module and the data analysis module respectively, is used to determine the corresponding working mode and perform blocking based on the rate of temperature rise in the indoor environment detected by the thermocouple temperature sensor within the initial sampling time when the indoor environment is in an abnormal state. The strategy control module is connected to the data acquisition module and the execution module respectively, and is used to determine the control strategy for the working mode based on the relative displacement change between the through-wall duct and the stainless steel insulation cotton detected by the displacement sensor when the through-wall duct is deformed by heat. An optimization module, which is connected to the execution module and the strategy control module respectively, is used to determine the optimization strategy for the sealing device based on the airflow efficiency index in the through-wall duct detected by the air velocity sensor and the air flow sensor.

[0031] Specifically, this invention utilizes multi-sensor and multi-module collaborative control, taking advantage of the characteristic that smoke takes precedence over flame during a fire. It uses both smoke sensors and thermocouple temperature sensors to perform dual detection of the indoor environment to determine whether there are any abnormalities, avoiding the slow and inaccurate response problems caused by the single detection of traditional devices. In addition, it combines the subsequent reduction in the sealing of pipes due to heat deformation and the obvious air flow characteristics in the ducts caused by the reduction in sealing, and adjusts and optimizes the corresponding working mode to ensure that the fireproof sealing of the ducts is effective for a long time in the fire scene.

[0032] Please see Figure 4 As shown, this is a judgment diagram for determining whether the indoor environment is in an abnormal state based on the smoke concentration in an embodiment of the present invention.

[0033] Specifically, the data analysis module determines whether the current indoor environment is in an abnormal state based on the comparison between the smoke concentration detected by the smoke sensor in the indoor environment during the initial sampling period and a smoke concentration threshold. If the smoke concentration is less than or equal to the smoke concentration threshold, then the current indoor environment is determined to be in a normal state. If the smoke concentration is greater than the smoke concentration threshold, it is determined that the current indoor environment is in an abnormal state. The smoke concentration threshold is the minimum allowable smoke content in the indoor environment, ranging from 0.05 dB / m to 0.1 dB / m. The preferred value in this invention is 0.08 dB / m. The preferred range and value of the smoke concentration threshold can be determined according to the actual situation, and are not specifically limited here.

[0034] In this embodiment of the invention, the smoke concentration threshold is set to 0.08 dB / m. During implementation, the comparison between the smoke concentration detected by the smoke sensor in the indoor environment within the initial sampling period and the smoke concentration threshold is used to determine whether the current indoor environment is in an abnormal state. For example, if the smoke concentration is 0.04 dB / m, it meets the condition that the smoke concentration is less than the smoke concentration threshold, indicating that the smoke concentration is within the safe range of the minimum allowable indoor smoke content, which is a normal phenomenon. In this case, the current indoor environment is determined to be in a normal state. Conversely, if the smoke concentration is 0.12 dB / m, it meets the condition that the smoke concentration is greater than the smoke concentration threshold, indicating that the smoke concentration exceeds the safe range of the minimum allowable indoor smoke content, which is an abnormal phenomenon. In this case, the current indoor environment is determined to be in an abnormal state.

[0035] Please see Figure 5 As shown, it is a judgment diagram of the present invention in which the corresponding working mode is determined and the blocking is performed according to the temperature rise rate.

[0036] Specifically, when the execution module determines that the indoor environment is in an abnormal state, it determines the corresponding blocking mode based on the temperature rise rate detected by the thermocouple temperature sensor within the initial sampling period and the preset temperature rise rate, and then executes the blocking. If the temperature rise rate is less than or equal to the preset temperature rise rate, then the blocking is performed in the first working mode. If the temperature rise rate is greater than the preset temperature rise rate, then the second working mode is used to perform the blocking. The preset ambient temperature rise rate is the change in temperature per unit time, with a value range of 0.1-0.2℃ / s. The preferred value in this invention is 0.15℃ / s. The preferred range and value of the preset ambient temperature rise rate can be determined according to the actual situation, and are not specifically limited here.

[0037] The temperature rise rate is obtained by the thermocouple based on the real-time detection of the indoor environment temperature value by the temperature sensor. In practical applications, the temperature value of the indoor environment detected by the thermocouple temperature sensor per unit time is obtained, and the ratio of the difference between the temperature values ​​of two adjacent unit time periods to the time difference between two adjacent time periods is calculated to obtain the temperature rise rate.

[0038] In this embodiment of the invention, the preset temperature rise rate is 0.15℃ / s. During implementation, the corresponding working mode is determined and the blocking is performed based on the temperature rise rate detected by the thermocouple temperature sensor in the indoor environment within the initial sampling time and the preset temperature rise rate. For example, when the temperature rise rate is 0.08℃ / s, it meets the condition that the temperature rise rate is less than the preset temperature rise rate, indicating that although the indoor environment is in an abnormal state, the change in the indoor temperature value per unit time is not large and is within the safe range. In this case, the blocking device is determined to perform blocking in the first working mode. For example, when the temperature rise rate is 0.22℃ / s, it meets the condition that the temperature rise rate is greater than the preset temperature rise rate, indicating that the indoor environment is in an abnormal state due to smoke concentration and the change in the indoor temperature value per unit time is also large and exceeds the safe range. In this case, the blocking device is determined to perform blocking in the second working mode.

[0039] In this embodiment of the invention, the first working mode is to partially open the sealing devices installed in a plurality of through-wall ducts to perform sealing. The partial opening is the percentage of the number of opened sealing devices to the total number of sealing devices installed in the plurality of through-wall ducts that need to be fireproofed, and the value ranges from 15% to 25%. The present invention preferably uses a value of 20% to prevent the spread of fire and smoke.

[0040] In this embodiment of the invention, the second working mode is to partially open the sealing devices installed in a plurality of through-wall ducts to perform sealing. The partial opening is the percentage of the number of the opened sealing devices to the total number of the sealing devices installed in the plurality of through-wall ducts that need to be fireproofed. The value ranges from 30% to 40%, and the present invention preferably uses a value of 35% to reduce the spread of fire and smoke.

[0041] Furthermore, by combining the environmental parameters detected by various sensors during a fire to respond to an appropriate working mode, compared to the traditional "fully open and fully closed" working modes, this invention can adopt a partial blocking mode in the case of a small-scale fire, and further improve the blocking level in the case of a large-scale fire. It can effectively prevent the spread of fire in the early stage, avoid the impact of excessive blocking on the normal ventilation system of the building, and reduce the risk of system shutdown due to false alarms, thus achieving a balance between safety and economy.

[0042] Please see Figure 6 As shown, it is a judgment diagram for determining the corresponding control strategy based on the relative displacement change in an embodiment of the present invention.

[0043] Specifically, the strategy control module regulates the working mode set by the execution module. When the through-wall duct undergoes thermal deformation due to the temperature of the indoor environment, the strategy control module determines the control strategy for the working mode based on the comparison between the relative displacement change between the through-wall duct and the stainless steel insulation cotton detected by the displacement sensor and a preset relative displacement change. If the relative displacement change is less than or equal to the preset relative displacement change, then the first control strategy for the working mode is determined. If the relative displacement change is greater than the preset relative displacement change, then a second control strategy for the working mode is determined. The preset relative displacement change range is 3 to 5 mm, and the preferred value in this invention is 4 mm. The preferred range and preferred value of the preset relative displacement change can be selected according to the actual situation, and no specific limitation is made here.

[0044] The relative displacement change refers to the relative displacement change between the through-wall duct and the stainless steel insulation cotton. In practical applications, the through-wall duct is prone to thermal expansion due to the influence of high-temperature smoke and high-temperature fire sources in the indoor environment. This causes a change in the diameter of the through-wall duct, resulting in a decrease in the sealing performance of the contact area between the stainless steel insulation cotton and the through-wall duct. This makes it easier for high-temperature smoke to pass through the device and enter the next layer of sealing device. The displacement caused by the expansion of the through-wall duct is detected by a displacement sensor fixedly installed inside the through-wall duct at the contact area with the stainless steel insulation cotton, thus obtaining the relative displacement change.

[0045] In this embodiment of the invention, the preset relative displacement change is 4mm. During implementation, the control strategy for the working mode is determined based on the comparison between the relative displacement change between the through-wall duct and the stainless steel insulation cotton detected by the displacement sensor and the preset relative displacement change. For example, when the relative displacement change is 2mm, it meets the condition that the relative displacement change is less than the preset relative displacement change, indicating that the thermal expansion of the through-wall duct is less and the displacement relative to the stainless steel insulation cotton is smaller. In this case, the first control strategy for the working mode is determined. For example, when the relative displacement is 6mm, it meets the condition that the displacement change is greater than the preset displacement change, indicating that the thermal expansion of the through-wall duct is greater and the displacement relative to the stainless steel insulation cotton is larger. In this case, the second control strategy for the working mode is determined.

[0046] The first control strategy is to increase the percentage of the number of plugging devices that are activated in the first working mode to the total number of plugging devices. The increase ranges from 26% to 45%, and the present invention preferably increases the value by 40%. That is, the percentage of the number of partially activated plugging devices to the total number of plugging devices is increased to 40% to cope with the decrease in sealing performance caused by thermal expansion.

[0047] The second control strategy is to increase the percentage of the number of sealing devices that are activated in the second working mode to the total number of devices. The increase ranges from 46% to 60%, and the present invention preferably increases the value by 50%. That is, the percentage of the number of partially activated sealing devices to the total number of devices is increased to 50% to cope with the decrease in sealing performance caused by thermal expansion.

[0048] Furthermore, by detecting and analyzing the relative displacement changes caused by the thermal deformation of the duct, this invention can promptly activate more sealing devices when high-temperature smoke leaks due to decreased sealing caused by the thermal deformation of the sealing device close to the fire source. This effectively controls the leaked high-temperature smoke within the duct and prevents it from spreading into the room, ensuring the integrity of the multi-device sealing under high-temperature conditions in the fire scene and effectively preventing the leakage and spread of high-temperature smoke.

[0049] Please see Figure 7 As shown, it is a judgment diagram for determining the corresponding optimization strategy based on the air flow efficiency index in an embodiment of the present invention.

[0050] Specifically, the optimization module determines an optimization strategy for the sealing device based on a comparison between the airflow efficiency index detected by the air velocity sensor and the airflow sensor within the through-wall duct and a preset airflow efficiency index. If the airflow efficiency index is less than or equal to the preset airflow efficiency index, then the first optimization strategy for the blocking device is determined. If the airflow efficiency index is greater than the preset airflow efficiency index, then a second optimization strategy for the blocking device is determined. The preset airflow efficiency index ranges from 0.2 to 0.4, and the preferred value in this invention is 0.3. The preferred range and preferred value of the preset airflow efficiency index can be determined according to the actual situation, and no specific limitation is made here.

[0051] The airflow efficiency index is obtained by fusing the air state parameters detected by the air velocity sensor and the air flow sensor inside the through-wall duct. In practical applications, the air velocity sensor detects the air velocity on the other side of the through-wall duct to obtain air velocity data, and the air flow sensor detects the air flow on the other side of the through-wall duct to obtain air flow data. Finally, the ratio of the air flow rate to the product of the air velocity and the cross-sectional area of ​​the through-wall duct is calculated to obtain the airflow efficiency index.

[0052] In this embodiment of the invention, the preset airflow efficiency index is 0.3. During implementation, the optimization strategy for the sealing device is determined based on the comparison between the airflow efficiency index detected by the air velocity sensor and the airflow sensor in the wall-penetrating duct and the preset airflow efficiency index. For example, when the airflow efficiency index is 0.1, it is less than the preset airflow efficiency index, indicating that the airflow efficiency in the wall-penetrating duct is low, the air velocity is slow, and the airflow is small. In this case, the first optimization strategy for the sealing device is determined. For example, when the airflow efficiency index is 0.5, it is greater than the preset airflow efficiency index, indicating that the airflow efficiency in the wall-penetrating duct is high, the air velocity is fast, and the airflow is large. In this case, the second optimization strategy for the sealing device is determined.

[0053] The first optimization strategy is to shorten the initial sampling time of the sealing device. The shortening value ranges from 30 to 40 seconds, and the preferred value in this invention is 35 seconds. That is, the sampling time of the smoke sensor and the thermocouple temperature sensor is shortened to 35 seconds to detect and sample the indoor environmental parameters, thereby accelerating the response speed to fire hazards. This allows the device to detect whether the indoor environment is in an abnormal state as early as possible and to perform sealing in advance based on the abnormal state.

[0054] The second optimization strategy involves shortening the sampling time of the sealing devices and increasing the proportion of the number of sealing devices activated under the second control strategy. The shortening range is 20-30 seconds, with a preferred value of 25 seconds in this invention. The increasing range is 61%-70%, with a preferred value of 65% in this invention. That is, the sampling time of the smoke sensor and the thermocouple temperature sensor is shortened to 25 seconds to detect and sample indoor environmental parameters, accelerating the response speed to fire hazards. This allows the device to detect whether the indoor environment is in an abnormal state as early as possible and to perform sealing in advance based on the abnormal state. The proportion of partial activation is increased to 65% of the total number of sealing devices to seal the through-wall duct, compensating for insufficient sealing caused by the expansion of the sealing devices due to heat and the problem of smoke leakage.

[0055] The initial sampling duration is the time interval from the start of sampling to the end of sampling, which is 60 seconds.

[0056] Specifically, this invention addresses the airflow phenomenon within the duct caused by decreased sealing due to heat deformation, by combining air velocity and air flow rate to describe the airflow state and formulating corresponding optimization strategies. This effectively blocks the "chimney effect" caused by thermal pressure during a fire, greatly reducing the risk of high-speed airflow carrying smoke and flames to non-fire areas, and solving the defect of prior art that ignores the influence of airflow.

[0057] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A fire damper for a duct comprising a wedge-shaped slot frame assembly, characterized in that The application relates to a fireproofing device for a through-wall air duct, which comprises the following components: a fireproofing assembly, a detection device, a data acquisition module, a data analysis module, an execution module, a strategy regulation module and an optimization module. The fireproofing assembly comprises stainless steel thermal insulation cotton arranged on one side of a through-wall air duct to prevent fire spreading, and a plurality of wedge-shaped assemblies are arranged at the interface of the stainless steel thermal insulation cotton. The wedge-shaped assembly comprises a wedge-shaped groove arranged at the interface of the stainless steel thermal insulation cotton and a wedge-shaped protrusion arranged at the interface and matched with the wedge-shaped groove to insert into the wedge-shaped groove to stabilize the stainless steel thermal insulation cotton. The detection device comprises a thermocouple type temperature sensor and a smoke sensor for detecting the temperature and smoke concentration in an indoor environment, a displacement sensor for detecting the thermal deformation of the through-wall air duct, and an air flow rate sensor and an air flow volume sensor for detecting the air flow state in the through-wall air duct. The data acquisition module is used to acquire the indoor environment parameters and the air duct thermal deformation parameters and the air flow state in the through-wall air duct detected by the thermocouple type temperature sensor, the smoke sensor, the displacement sensor, the air flow rate sensor and the air flow volume sensor. The data analysis module is used to determine whether the current indoor environment is in an abnormal state according to the smoke concentration in the indoor environment detected by the smoke sensor within an initial sampling time length. The execution module is used to determine the first fireproofing mode of partially opening the fireproofing devices arranged in the through-wall air duct according to the temperature rising rate in the indoor environment detected by the thermocouple type temperature sensor within the initial sampling time length. The strategy regulation module is used to determine the percentage of the number of the fireproofing devices with increased opening degree in the total number according to the relative displacement change between the through-wall air duct and the stainless steel thermal insulation cotton detected by the displacement sensor to regulate the fireproofing mode. The optimization module is used to determine the optimization of the fireproofing devices according to the air flow efficiency index in the through-wall air duct detected by the air flow rate sensor and the air flow volume sensor to shorten the sampling time length of the fireproofing devices and increase the percentage of the number of the opened fireproofing devices in the total number.

2. The Duct Closure Assembly of claim 1, wherein: The data analysis module determines that the current indoor environment is in an abnormal state according to the smoke concentration in the indoor environment detected by the smoke sensor within the initial sampling time length being greater than a smoke concentration threshold value.

3. The Duct Closure Assembly of claim 2, wherein: The execution module determines the first fireproofing mode of partially opening the fireproofing devices arranged in the through-wall air duct according to the temperature rising rate in the indoor environment detected by the thermocouple type temperature sensor within the initial sampling time length being less than or equal to a preset temperature rising rate when the indoor environment is in an abnormal state.

4. The dampers of claim 3, wherein, The execution module determines the second fireproofing mode of partially opening the fireproofing devices arranged in the through-wall air duct according to the temperature rising rate in the indoor environment detected by the thermocouple type temperature sensor within the initial sampling time length being greater than a preset temperature rising rate when the indoor environment is in an abnormal state.

5. The dampers of claim 4, wherein, The initial sampling time length is a time interval from a sampling start time to a sampling end time, and the time interval is 60 s.

6. The dampers of claim 5, wherein, The strategy regulation module determines to regulate the blocking mode by increasing the percentage of the number of the partially opened blocking devices in the total number when the relative displacement change between the through-wall air pipe and the stainless steel thermal insulation cotton detected by the displacement sensor is less than or equal to a preset relative displacement change when the through-wall air pipe is heated and deformed.

7. The dampers of claim 6, wherein, The strategy regulation module determines to regulate the blocking mode by increasing the percentage of the number of the partially opened blocking devices in the total number when the relative displacement change between the through-wall air pipe and the stainless steel thermal insulation cotton detected by the displacement sensor is greater than a preset relative displacement change when the through-wall air pipe is heated and deformed.

8. The dampers of claim 7, wherein, The optimization module determines to optimize the blocking device by shortening the initial sampling duration of the blocking device when the air flow efficiency index in the through-wall air pipe detected by the air flow rate sensor and the air flow sensor is less than or equal to a preset air flow efficiency index.

9. The dampers of claim 8, wherein, The optimization module determines to optimize the blocking device by shortening the sampling duration of the blocking device and increasing the percentage of the number of the opened blocking devices in the total number when the air flow efficiency index in the through-wall air pipe detected by the air flow rate sensor and the air flow sensor is greater than a preset air flow efficiency index.

10. The dampers of claim 1, wherein, The stainless steel thermal insulation cotton has an upper layer and a lower layer.

Images