Method and system for guaranteeing and verifying high-temperature environment tolerance of flashover early warning device

Abstract

The invention discloses a high-temperature environment tolerance guarantee and verification method and system for a flashover early warning device. The method comprises the steps that the highest environment temperature of the preset installation position of the flashover early warning device is measured; measuring the temperature rise of the device caused by the work of internal electronic components; calculating the maximum allowable temperature of the internal cavity of the device under the action of the external heat source; testing and optimizing the heat insulation performance of a closed heat insulation shell of the device until the temperature of an inner cavity of the closed heat insulation shell is lower than the maximum allowable temperature in a high-temperature environment; and carrying out high-temperature environment tolerance verification on the device equipped with the optimized heat insulation shell in a simulated flashover scene. The system is designed based on the method. The device can comprehensively simulate the internal and external dual heating conditions of the device, is adaptive to the three-dimensional closed heat insulation structure, effectively guarantees and verifies the reliability of the flashover early warning device at high temperature through iterative optimization and system verification, and solves the limitations of single geometry of a test object and incomplete heating condition simulation in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of fire detection technology, and in particular to a method and system for ensuring and verifying the high-temperature environment tolerance of a flashover warning device. Background Art

[0002] Flashover is one of the most common fire phenomena associated with firefighter casualties in indoor fires. It is characterized by the simultaneous and comprehensive combustion of all combustible surfaces within a short period of time. Therefore, accurately predicting flashover and providing timely warnings to firefighters entering the fire scene are crucial for protecting the lives of rescuers and ensuring the smooth conduct of firefighting and rescue operations. As a key component in achieving this goal, flashover warning devices face critical challenges, such as performance stability and reliability in the harsh, high-temperature environment of a fire scene.

[0003] However, current high-temperature performance testing methods and facilities for materials or components generally have the following limitations when applied to the tolerance assurance and verification of flashover warning devices:

[0004] 1) Existing tests primarily target two-dimensional flat panels or simple geometric shapes (e.g., tubes) of thermal insulation materials or components, such as various fireproof panels, thermal insulation wool, and vacuum glass. However, flashover warning devices typically utilize a closed, three-dimensional, insulated enclosure composed of multiple surfaces to protect their core electronic components. Existing testing methods are difficult to directly adapt to the thermal insulation performance assessment of such complex, enclosed structures.

[0005] 2) Most tests use a single-sided heat source, meaning heat is applied only from one side of the device being tested. However, when a flashover warning device operates in an actual fire, not only is its insulated outer shell directly exposed to the high temperatures of the fire, but the electronic components encapsulated within also generate heat during continuous operation, creating a complex operating condition where both the inside and outside are heated simultaneously. Existing tests fail to fully account for this dual heat load.

[0006] 3) Existing tests often focus only on the thermal insulation performance indicators of the insulation material or insulation structure itself, and fail to incorporate the actual operating temperature limit of the protected object (i.e., the electronic components in the flashover warning device) and the overall functionality of the device at high temperatures (such as the accuracy of data collection and transmission) into the comprehensive evaluation and verification system.

[0007] 4) Most tests are limited to small-scale laboratory testing, making it impossible to conduct final verification of the high-temperature tolerance and working reliability of the entire flashover warning device under simulated real-world fire scenarios. At the same time, there is also a lack of a systematic method for effectively optimizing and iteratively verifying the thermal insulation shell when the test fails.

[0008] Therefore, the existing technology has obvious deficiencies in ensuring and verifying the high-temperature environment tolerance of a flashover warning device with a complex three-dimensional closed insulating shell and working under the combined action of internal and external dual heat sources. There is an urgent need for a more comprehensive, more practical, and dedicated method and system that includes iterative optimization and system verification. Summary of the Invention

[0009] The present invention provides a method and system for ensuring and verifying the high-temperature environment tolerance of a flashover warning device, which can solve the above-mentioned problems.

[0010] In order to solve the above problems, the technical solutions adopted by the present invention are as follows:

[0011] In a first aspect, the present invention provides a method for ensuring and verifying the high-temperature environmental tolerance of a flashover warning device, the flashover warning device comprising a closed, thermally insulated housing enclosing a closed three-dimensional space, and electronic components within the closed, thermally insulated housing. The method takes into account the dual heat loads of the flashover warning device being subjected to high-temperature attack from a fire on the outside and the continuous heat generation from the internal electronic components, as well as the maximum allowable temperature of the innermost cavity of the closed, thermally insulated housing when only under the action of an external heat source, after considering the heat generation factor from the internal electronic components. The closed, thermally insulated housing is tested for thermal insulation performance, and the flashover warning device equipped with the closed, thermally insulated housing that passes the thermal insulation performance test is verified for high-temperature environmental tolerance. If either the thermal insulation performance test or the high-temperature environmental tolerance verification fails, the closed, thermally insulated housing needs to be optimized. The flashover warning device is a portable flashover warning device or a flashover alarm of a fixed flashover warning system.

[0012] Specifically, when optimizing the closed heat-insulating shell, at least one of its thickness, material and geometric style needs to be optimized.

[0013] Specifically, the closed heat-insulating shell is a double-layer shell, including a first closed heat-insulating shell and a second closed heat-insulating shell wrapping the first closed heat-insulating shell.

[0014] Specifically, the above method comprises the following steps:

[0015] S1. In the simulation of a real indoor flashover fire scene, when the indoor ceiling smoke layer temperature is not lower than the temperature threshold T s When the flashover warning device is installed at the preset location, the maximum ambient temperature T0 is measured.

[0016] S2. Under normal temperature conditions, measure the temperature rise ΔT of the innermost cavity of the flashover warning device caused by the internal electronic components operating continuously for Δt;

[0017] S3. The maximum operating temperature T allowed for the internal electronic components of the flashover warning device max Subtract the temperature rise ΔT to obtain the maximum allowable temperature T of the innermost cavity of the device's closed thermal insulation shell when it is only exposed to external heat sources, taking into account the heating factors of the device's internal electronic components;

[0018] S4. Perform a thermal insulation performance test on the separate enclosed thermal insulation shell. If the thermal insulation performance test fails, optimize the enclosed thermal insulation shell until the thermal insulation performance test passes.

[0019] The method for testing the thermal insulation performance of the closed thermal insulation shell includes: placing the closed thermal insulation shell in an environment with an ambient temperature of T0 for a duration of Δt, and measuring the cavity temperature inside the closed thermal insulation shell. If the cavity temperature is less than the maximum allowable temperature T, the thermal insulation performance test is passed; otherwise, it fails.

[0020] S5. The flashover warning device, equipped with a closed thermally insulated enclosure that has passed the thermal insulation performance test, is subjected to a high-temperature environment tolerance verification in a simulated real indoor flashover fire scenario. If the high-temperature environment tolerance verification passes, the verification ends. Otherwise, the separate closed thermally insulated enclosure is optimized again, and then the process jumps to step S4.

[0021] Among them, the method for verifying the high temperature environment tolerance in a simulated real indoor flashover fire scene includes: when the temperature of the indoor ceiling smoke layer is not lower than the temperature threshold T s When the duration is Δt, the mean absolute error between the temperature time series value output by the flashover warning device within the duration Δt and the temperature time series verification reference value collected at the same position is calculated. If the mean absolute error is less than the error threshold ΔT index , the high temperature environment tolerance verification passes, otherwise it fails.

[0022] In the second aspect, the present invention provides a high-temperature environment tolerance assurance and verification system for a flashover warning device. Based on this system, the method described in the first aspect can be implemented; the system includes a first constant temperature heating box, a second constant temperature heating box, a third constant temperature heating box, a data acquisition system, a fire flashover simulation chamber, a first temperature sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor, a fifth temperature sensor, a sixth temperature sensor, a seventh temperature sensor, an eighth temperature sensor and a ninth temperature sensor. Except for the sixth temperature sensor and the ninth temperature sensor, the data of other temperature sensors are connected to the data acquisition system; the fire flashover simulation chamber includes a first constant temperature heating box, a second constant temperature heating box, a third constant temperature heating box, a fourth temperature sensor, a fifth temperature sensor, a sixth temperature sensor, a seventh temperature sensor, an eighth temperature sensor and a ninth temperature sensor. An entrance door and a ventilation window are respectively provided on opposite sides of the simulation chamber; a water receiving tray is provided in the center of the floor of the fire scene flashover simulation chamber, and a combustion tray for carrying fire source fuel is provided in the water receiving tray; the first temperature sensor is provided on the ceiling of the fire scene flashover simulation chamber and is used to measure the temperature of the smoke layer; the second temperature sensor is used to measure the ambient temperature at the preset installation position of the first flashover warning device, and the first flashover warning device is a portable flashover warning device; the third temperature sensor is used to measure the ambient temperature at the preset installation position of the second flashover warning device, and the second flashover warning device is a flashover warning device of a fixed flashover warning system.

[0023] Specifically, when measuring the temperature rise of the innermost cavities of the first and second flashover warning devices after the internal electronic components of the devices have been working continuously for a period of Δt under normal temperature, the fourth temperature sensor is set in the innermost cavity of the first flashover warning device, and the fifth temperature sensor is set in the innermost cavity of the second flashover warning device.

[0024] Specifically, when simulating the data transmission state of the second flashover warning device when it is working normally, the sixth temperature sensor is set in the first constant temperature heating box, and the internal temperature of the first constant temperature heating box is set to T s The data input end of the second flashover warning device is connected to the sixth temperature sensor, and the data output end is connected to the data acquisition system.

[0025] Specifically, when the thermal insulation performance test of the closed thermal insulation shell of the first flashover warning device and the second flashover warning device is performed, the following operations are performed: the closed thermal insulation shell of the first flashover warning device is placed in the second constant temperature heating box, and the internal temperature of the second constant temperature heating box is set to the maximum ambient temperature T at the preset installation position of the first flashover warning device. 0,a Place the enclosed heat-insulating shell of the second flashover warning device into the third constant temperature heating box, and set the internal temperature of the third constant temperature heating box to the maximum ambient temperature T at the preset installation position of the second flashover warning device. 0,b; The seventh temperature sensor is set in the closed heat-insulating shell of the first flashover warning device; the eighth temperature sensor is set in the closed heat-insulating shell of the second flashover warning device.

[0026] Specifically, when verifying the high-temperature environment tolerance of the first flashover warning device and the second flashover warning device, the following operations are performed: the first flashover warning device is fixed to the upper end of the side edge of the door leaf of the entrance door, and the second temperature sensor is close to the first flashover warning device, and the first flashover warning device is connected to the data acquisition system via wireless transmission; the ninth temperature sensor is installed on the ceiling of the fire flashover simulation chamber, close to the first temperature sensor; the second flashover warning device is installed on the lower middle part of the side wall in the fire flashover simulation chamber, close to the third temperature sensor; the data input end of the second flashover warning device is connected to the ninth temperature sensor, and the data output end is connected to the data acquisition system.

[0027] Specifically, the system also includes a fuel supply device for supplying fuel to the combustion disk; the fuel supply device includes a fuel storage tank, a flow regulating valve and a fuel delivery pipe, which relies on the gravity of the fuel to transport the fuel along the fuel delivery pipe into the combustion disk; the fuel storage tank is located outside the fire flashover simulation chamber and is supported by a base; the flow regulating valve is located outside the fire flashover simulation chamber and is arranged on the fuel delivery pipe; the fuel delivery pipe is arranged at an angle, the upper inlet is connected to the fuel storage tank, and the lower outlet extends into the fire flashover simulation chamber and extends into the combustion disk.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1) The method of the present invention systematically considers the dual heat loads of the flashover warning device: the external heat of the fire and the continuous heat generation of the internal electronic components. After accounting for the heat generation of the internal electronic components, the maximum allowable temperature of the innermost cavity of the device's enclosed insulated casing is determined by calculation when subjected only to external heat sources. This method of quantifying and comprehensively evaluating the internal and external heat sources makes insulation design and verification more scientific and accurate.

[0030] 2) The method and system of the present invention are specifically designed for closed three-dimensional thermally insulated enclosures formed by multiple surfaces (a typical structure of flashover warning devices). They can effectively evaluate and optimize the thermal insulation performance of such structures, overcoming the limitation of existing technologies that are only applicable to test objects with simple geometric shapes.

[0031] 3) The method of the present invention includes a clear closed-loop process of testing-optimizing-retesting. By making targeted adjustments to the thickness, material, geometric style, etc. of the insulation shell, its thermal insulation performance is gradually improved until it meets the requirements and passes the final high-temperature environment tolerance verification, thereby significantly improving the reliability of the flashover warning device in real fire scenes.

[0032] 4) The present invention adopts a two-stage strategy of "first testing and optimizing the thermal insulation shell separately, then verifying the entire device." First, the thermal insulation performance of the thermal insulation shell is preliminarily tested and optimized in a controllable constant-temperature heating box, which is relatively inexpensive. After the thermal insulation shell meets the basic requirements, the fully assembled flashover warning device is put into a simulated real fire scenario for final functional verification. This phased approach not only ensures the comprehensiveness and reliability of the verification, but also avoids early damage to the entire device due to insufficient insulation in expensive real fire tests, effectively saving testing costs.

[0033] 5) The present invention defines the maximum allowable temperature T of the internal cavity based on the maximum operating temperature of the electronic components and the self-heating temperature rise as a test criterion for the thermal insulation performance of the closed insulated casing of the flashover warning device when it is only subjected to the action of an external heat source; and defines the mean absolute error between the device output temperature and the verification reference temperature as a criterion for verifying the high-temperature environment tolerance (functionality) of the flashover warning device. These quantitative criteria make the evaluation process more objective and accurate.

[0034] 6) The method and system of the present invention clearly support the assurance and verification of portable flashover warning devices and flashover warning devices of fixed flashover warning systems, covering the main equipment forms of current flashover warning technology.

[0035] 7) This invention provides a complete set of dedicated protection and verification solutions to meet the special working requirements of flashover warning devices under high temperatures in fire scenes, filling the technical gap in this field. It has important practical value for improving the quality and reliability of flashover warning products and ensuring the safety of firefighters.

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, embodiments of the present invention are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 Schematic diagram of the process of ensuring and verifying the high temperature environment tolerance of the flashover warning device of the present invention;

[0039] Figure 2 A schematic diagram of a facility for measuring the maximum ambient temperature at the installation locations of two types of flashover warning devices when a flashover occurs according to the present invention;

[0040] Figure 3 Schematic diagram of a facility for measuring the internal temperature rise of two types of flashover warning devices after continuous operation under normal temperature working environment according to the present invention;

[0041] Figure 4 Schematic diagram of the facility for measuring and verifying the thermal insulation performance of the thermal insulation structures of two types of flashover warning devices according to the present invention;

[0042] Figure 5 Schematic diagram of the facility for measuring and verifying the high temperature environment tolerance of two types of flashover warning devices according to the present invention;

[0043] Figure numerals: 1. Portable flashover warning device, 2. Flashover warning device of fixed flashover warning system, 3. First closed heat-insulating shell, 4. Second closed heat-insulating shell, 5. Fire flashover simulation chamber, 6. Entrance door, 7. Ventilation window, 8. Water tray, 9. Burning tray, 10. First temperature sensor, 11. Second temperature sensor, 12. Third temperature sensor, 13. Data acquisition system, 14. Base, 15. Fuel storage tank, 16. Fuel delivery pipe, 17. Flow regulating valve, 18. Fourth temperature sensor, 19. Fifth temperature sensor, 20. First constant temperature heating box, 21. Sixth temperature sensor, 22. Second constant temperature heating box, 23. Third constant temperature heating box, 24. Seventh temperature sensor, 25. Eighth temperature sensor, 26. Ninth temperature sensor. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0045] The present invention provides a method and system for ensuring and verifying the high-temperature environmental tolerance of a flashover warning device. The flashover warning device comprises a closed, thermally insulated enclosure that encloses a three-dimensional space, and electronic components located within the enclosure. The flashover warning device can be a portable flashover warning device 1 or a flashover warning unit 2 of a fixed flashover warning system.

[0046] Example 1

[0047] Reference Figure 1 This embodiment is a method for ensuring and verifying the high temperature environment tolerance of a flashover warning device, which specifically includes the following steps:

[0048] S1. Measure the maximum ambient temperature T0 at the preset installation location of the flashover warning device:

[0049] In the simulation of real indoor flashover fire scene, for example, Figure 2The fire flashover simulation chamber 5 shown. When flashover occurs in the fire flashover simulation chamber 5 and the temperature of the ceiling smoke layer (measured by the first temperature sensor 10) is not lower than the preset temperature threshold T s When the temperature rises to 600° C. (for example, 600° C.) and lasts for a preset time Δt (for example, 10 minutes), the maximum ambient temperature T0 at the preset installation position of the flashover warning device is measured and recorded.

[0050] The portable flashover warning device 1 is usually installed at the upper end of the side edge of the door leaf of the entrance door 6, and its ambient temperature T0 (specifically T 0,a ) can be measured by the second temperature sensor 11.

[0051] The flashover warning device 2 of the fixed flashover warning system is usually installed in the lower middle part of the side wall of the room and close to the third temperature sensor 12. The ambient temperature T0 (specifically T 0,b ) can be measured by the third temperature sensor 12.

[0052] A water tray 8 is located at the center of the floor of the fire flashover simulation chamber 5, within which is a combustion tray 9. Fuel is supplied to the combustion tray 9 via a fuel supply system (including a fuel storage tank 15, a base 14, a fuel delivery pipe 16, and a flow control valve 17) to maintain continuous combustion. Data is recorded by a data acquisition system 13.

[0053] S2. Measure the temperature rise ΔT of the innermost cavity of the flashover warning device caused by the operation of the internal electronic components:

[0054] At room temperature (e.g., 25°C), operate the electronic components within the flashover warning device continuously (i.e., keep the device powered on) for a duration Δt (consistent with the duration in S1). Measure and record the temperature rise ΔT in the innermost cavity (typically the core area where the electronic components are located).

[0055] like Figure 3 As shown, for the portable flashover warning device 1, its internal temperature rise ΔT (specifically ΔT a ) can be measured by the fourth temperature sensor 18 placed in its innermost cavity.

[0056] For the flashover warning device 2 of the fixed flashover warning system, its internal temperature rise ΔT (specifically ΔT b) can be measured by the fifth temperature sensor 19 placed in its innermost cavity. In addition, in order to accurately reproduce the data input and output status of the flashover warning device 2 of the fixed flashover warning system during normal operation and to better simulate the additional heat that may be generated by data transmission, the data input end of the flashover warning device 2 of the fixed flashover warning system can be connected to the sixth temperature sensor 21, and the data output end can be connected to the data acquisition system 13. At the same time, the sixth temperature sensor 21 can be placed in the first constant temperature heating box 20, and the internal temperature of the first constant temperature heating box is set to the preset ceiling smoke layer temperature threshold T s .

[0057] S3. Calculate the maximum allowable temperature T of the innermost cavity of the closed thermal insulation shell of the flashover warning device when it is only exposed to external heat sources:

[0058] According to the maximum operating temperature T allowed by the electronic components inside the flashover warning device max (For example, T max,a 85℃, T max,b is 90°C), minus the corresponding temperature rise ΔT (ΔT a or ΔT b ), and the maximum temperature T(T) allowed to be reached by the innermost cavity of the closed heat-insulating shell of the flashover warning device when it is subjected to only external heat source is obtained. a =T max,a -ΔT a ;T b =T max,b -ΔT b ), this temperature T is the passing threshold for the subsequent thermal insulation shell performance test.

[0059] S4. Test and optimize the thermal insulation performance of a separate enclosed thermal insulation enclosure:

[0060] The internal mechanism of the flashover warning device is removed, and only its closed heat-insulating shell (such as the combination of the first closed heat-insulating shell 3 and the second closed heat-insulating shell 4) is retained.

[0061] like Figure 4 As shown, the closed heat-insulating shell to be tested (such as the closed heat-insulating shell of the portable flashover warning device 1) is placed in the second constant temperature heating box 22, and its external ambient temperature is set to the corresponding maximum ambient temperature T measured in step S1. 0,a , and lasts for a period of time Δt, and the internal cavity temperature after this period of time is measured by the seventh temperature sensor 24.

[0062] If the internal cavity temperature is lower than the maximum allowable temperature T calculated in step S3 a , then the thermal insulation performance test of the thermal insulation shell is considered to have passed.

[0063] If the test fails, the insulation shell needs to be optimized, for example, by adjusting its thickness, replacing it with a material with better insulation performance, or changing its geometry (such as adding an air layer or adopting a labyrinthine structure). If a double-layer shell structure is used (a combination of a first enclosed insulation shell 3 and a second enclosed insulation shell 4), the material, thickness, or spacing of the inner and outer shells can be adjusted. After optimization, repeat this step until the test passes.

[0064] Similarly, the closed heat-insulating housing of the flashover warning device 2 of the fixed flashover warning system can be placed in the third constant temperature heating box 23, and the external environment temperature is set to T 0,b The internal cavity temperature is measured by the eighth temperature sensor 25 and compared with T b Compare and if it fails, optimize and repeat the test.

[0065] S5. Verify the high temperature environment tolerance of the flashover warning device equipped with a tested thermal insulation shell:

[0066] The thermal insulation housing that has passed the thermal insulation performance test in step S4 and the internal electronic components are reassembled into a complete flashover warning device.

[0067] like Figure 5 As shown, in the simulation of a real indoor flashover fire scene, the flashover warning device is set at its preset working position. When the temperature of the indoor ceiling smoke layer is not lower than the temperature threshold T s And when the duration is Δt, monitor whether the flashover warning device can work continuously, normally and accurately.

[0068] Compare the temperature time series value output by the flashover warning device itself with the temperature time series verification benchmark value collected at its installation location within the time length Δt, calculate the mean absolute error between the two, and if the error is less than the preset error threshold ΔT index (e.g. 5°C), the high temperature environment tolerance verification is considered passed and the entire process ends.

[0069] If the verification fails (e.g. device failure, data error exceeds ΔT index etc.), it indicates that the thermal insulation performance of the current thermal insulation shell is still insufficient to ensure the stable operation of the device under real flashover conditions. At this time, it is necessary to return to step S4 and further optimize the closed thermal insulation shell (for example, increase the thickness, replace higher-level thermal insulation materials, etc.), and then re-test S4. After passing, perform S5 verification until S5 verification is passed.

[0070] Example 2

[0071] This embodiment is a high temperature environment tolerance assurance and verification system for a flashover warning device, which is used to implement the method described in Example 1. The specific structure thereof is as follows: Figures 2 to 5 .

[0072] The system structure is as follows:

[0073] The fire flashover simulation chamber 5 is used to simulate a real indoor flashover fire scene (execute steps S1 and S5). The fire flashover simulation chamber 5 is provided with an entrance door 6 and a ventilation window 7. A water receiving tray 8 and a combustion tray 9 are provided in the center of the ground. A first temperature sensor 10 is installed on the ceiling to measure the temperature of the smoke layer. The fire flashover simulation chamber 5 is externally connected to a fuel supply device, which includes a fuel storage tank 15 (usually placed on a base 14), a fuel delivery pipe 16 and a flow regulating valve 17. The fuel delivery pipe 16 is arranged at an angle, with the upper inlet connected to the fuel storage tank 15 and the lower outlet extending into the fire flashover simulation chamber 5 and extending into the combustion tray 9.

[0074] The first temperature sensor 10 measures the temperature of the ceiling smoke layer; the second temperature sensor 11 measures the ambient temperature at the installation location of the portable flashover warning device 1; and the third temperature sensor 12 measures the ambient temperature at the installation location of the flashover warning device 2 of the fixed flashover warning system.

[0075] Fourth temperature sensor 18 measures the temperature rise within the portable flashover warning device 1; fifth temperature sensor 19 measures the temperature rise within the fixed flashover warning system's flashover warning device 2. Sixth temperature sensor 21, in conjunction with first constant-temperature heating box 20, simulates the data collection process of the fixed flashover warning system and the data transmission process to the flashover warning device 2.

[0076] The seventh temperature sensor 24 measures the temperature of the cavity inside the thermal insulation shell of the portable flashover warning device 1 ; the eighth temperature sensor 25 measures the temperature of the cavity inside the thermal insulation shell of the flashover warning device 2 of the fixed flashover warning system.

[0077] The ninth temperature sensor 26 can be used as a reference temperature sensor when the flashover warning device 2 of the fixed flashover warning system is working near the ceiling, and is as close as possible to the first temperature sensor 10. The second temperature sensor 11 can also be used as a reference temperature sensor when verifying the portable flashover warning device 1.

[0078] The first constant temperature heating box 20 is used to simulate the high temperature environment of the ceiling smoke layer where the data acquisition terminal of the fixed flashover warning system is located.

[0079] The second constant temperature heating box 22 is used to test the thermal insulation performance of the thermal insulation shell of the portable flashover warning device 1. The internal temperature of the second constant temperature heating box 22 can be set to T 0,a .

[0080] The third constant temperature heating box 23 is used to test the thermal insulation performance of the thermal insulation shell of the flashover warning device 2 of the fixed flashover warning system. The internal temperature of the third constant temperature heating box 23 can be set to T 0,b .

[0081] The data acquisition system is used to collect, record, and process temperature data and device operating status data in real time, and perform error comparison and analysis. The portable flashover warning device is connected to the data acquisition system via wireless transmission. The flashover warning device 2 of the fixed flashover warning system is connected to the ninth temperature sensor 26 at its data input in S5, and to the data acquisition system 13 at its data output.

[0082] The various components of the system work together to complete the entire process from initial ambient temperature measurement, internal heat evaluation, thermal insulation shell performance testing and optimization, to final verification of the whole machine's high-temperature environment tolerance.

[0083] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for ensuring and verifying the high-temperature environment tolerance of a flashover warning device, wherein the flashover warning device comprises a closed thermally insulated housing enclosing a closed three-dimensional space, and electronic components located within the closed thermally insulated housing, characterized in that: The method takes into account the dual heat loads of the flashover warning device, namely, the external heat of the fire and the continuous heat generation of the internal electronic components. Furthermore, after considering the heat generation of the internal electronic components, the method considers the maximum allowable temperature of the innermost cavity of the closed thermally insulated housing when only under the action of the external heat source. The closed thermally insulated housing is tested for thermal insulation performance, and the flashover warning device equipped with the closed thermally insulated housing that passes the thermal insulation performance test is verified for high-temperature environmental tolerance. If either the thermal insulation performance test or the high-temperature environmental tolerance verification fails, the closed thermally insulated housing needs to be optimized. The flashover warning device may be a portable flashover warning device or a flashover warning device of a fixed flashover warning system.

2. The method according to claim 1, characterized in that When optimizing the closed heat-insulating shell, at least one of its thickness, material and geometric style needs to be optimized.

3. The method according to claim 1, characterized in that The closed heat-insulating shell is a double-layer shell, comprising a first closed heat-insulating shell and a second closed heat-insulating shell wrapping the first closed heat-insulating shell.

4. The method according to claim 1, wherein The method specifically comprises the following steps: S1. In the simulation of a real indoor flashover fire scene, when the indoor ceiling smoke layer temperature is not lower than the temperature threshold T s When the flashover warning device is installed at the preset location, the maximum ambient temperature T0 is measured. S2. Under normal temperature conditions, measure the temperature rise ΔT of the innermost cavity of the flashover warning device caused by the internal electronic components operating continuously for Δt; S3. The maximum operating temperature T allowed for the internal electronic components of the flashover warning device max Subtract the temperature rise ΔT to obtain the maximum allowable temperature T of the innermost cavity of the device's closed thermal insulation shell when it is only exposed to external heat sources, taking into account the heating factors of the device's internal electronic components; S4. Perform a thermal insulation performance test on the separate enclosed thermal insulation shell. If the thermal insulation performance test fails, optimize the enclosed thermal insulation shell until the thermal insulation performance test passes. The method for testing the thermal insulation performance of the closed thermal insulation shell includes: placing the closed thermal insulation shell in an environment with an ambient temperature of T0 for a duration of Δt, and measuring the cavity temperature inside the closed thermal insulation shell. If the cavity temperature is less than the maximum allowable temperature T, the thermal insulation performance test is passed; otherwise, it fails. S5. The flashover warning device, equipped with a closed thermally insulated enclosure that has passed the thermal insulation performance test, is subjected to a high-temperature environment tolerance verification in a simulated real indoor flashover fire scenario. If the high-temperature environment tolerance verification passes, the verification ends. Otherwise, the separate closed thermally insulated enclosure is optimized again, and then the process jumps to step S4. Among them, the method for verifying the high temperature environment tolerance in a simulated real indoor flashover fire scene includes: when the temperature of the indoor ceiling smoke layer is not lower than the temperature threshold T s When the duration is Δt, the mean absolute error between the temperature time series value output by the flashover warning device within the duration Δt and the temperature time series verification reference value collected at the same position is calculated. If the mean absolute error is less than the error threshold ΔT index , the high temperature environment tolerance verification passes, otherwise it fails.

5. A flashover warning device high temperature environment tolerance assurance and verification system, characterized by: Based on this system, the methods described in claims 1 to 4 can be implemented. The system includes a first constant temperature heating box, a second constant temperature heating box, a third constant temperature heating box, a data acquisition system, a fire flashover simulation chamber, a first temperature sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor, a fifth temperature sensor, a sixth temperature sensor, a seventh temperature sensor, an eighth temperature sensor and a ninth temperature sensor. Except for the sixth temperature sensor and the ninth temperature sensor, data of other temperature sensors are connected to the data acquisition system; an entrance door and a ventilation window are respectively provided on opposite sides of the fire flashover simulation chamber; a water receiving tray is provided in the center of the floor of the fire flashover simulation chamber, and a combustion tray for carrying fire source fuel is provided in the water receiving tray; the first temperature sensor is provided on the ceiling of the fire flashover simulation chamber and is used to measure the temperature of the smoke layer; the second temperature sensor is used to measure the ambient temperature at a preset installation position of the first flashover warning device, and the first flashover warning device is a portable flashover warning device; The third temperature sensor is used to measure the ambient temperature at a preset installation position of the second flashover warning device, which is a flashover warning device of a fixed flashover warning system.

6. The system according to claim 5, characterized in that When measuring the temperature rise of the innermost cavities of the first and second flashover warning devices after the internal electronic components of the first and second flashover warning devices have been in continuous operation for a period of Δt under normal temperature, the fourth temperature sensor is disposed in the innermost cavity of the first flashover warning device, and the fifth temperature sensor is disposed in the innermost cavity of the second flashover warning device.

7. The system according to claim 5, characterized in that When simulating the data transmission state of the second flashover warning device when it is working normally, the sixth temperature sensor is set in the first constant temperature heating box, and the internal temperature of the first constant temperature heating box is set to T s The data input end of the second flashover warning device is connected to the sixth temperature sensor, and the data output end is connected to the data acquisition system.

8. The system according to claim 5, wherein: When the thermal insulation performance test of the closed thermal insulation shell of the first flashover warning device and the second flashover warning device is carried out, the following operations are performed: the closed thermal insulation shell of the first flashover warning device is placed in the second constant temperature heating box, and the internal temperature of the second constant temperature heating box is set to the maximum ambient temperature T at the preset installation position of the first flashover warning device. 0,a Place the enclosed heat-insulating shell of the second flashover warning device into the third constant temperature heating box, and set the internal temperature of the third constant temperature heating box to the maximum ambient temperature T at the preset installation position of the second flashover warning device. 0,b ; The seventh temperature sensor is set in the closed heat-insulating shell of the first flashover warning device; the eighth temperature sensor is set in the closed heat-insulating shell of the second flashover warning device.

9. The system according to claim 5, characterized in that When verifying the high-temperature environment tolerance of the first flashover warning device and the second flashover warning device, the following operations are performed: the first flashover warning device is fixed to the upper end of the side edge of the door leaf of the entrance door, and the second temperature sensor is close to the first flashover warning device, and the first flashover warning device is connected to the data acquisition system via wireless transmission; the ninth temperature sensor is installed on the ceiling of the fire flashover simulation chamber, close to the first temperature sensor; the second flashover warning device is installed on the lower middle part of the side wall of the fire flashover simulation chamber, close to the third temperature sensor; the data input end of the second flashover warning device is connected to the ninth temperature sensor, and the data output end is connected to the data acquisition system.

10. The system according to claim 5, wherein: It also includes a fuel supply device for supplying fuel to the combustion disk; the fuel supply device includes a fuel storage tank, a flow regulating valve and a fuel delivery pipe, which relies on the gravity of the fuel to transport the fuel along the fuel delivery pipe into the combustion disk; the fuel storage tank is located outside the fire flashover simulation chamber and is supported by a base; the flow regulating valve is located outside the fire flashover simulation chamber and is arranged on the fuel delivery pipe; the fuel delivery pipe is arranged at an angle, with the upper inlet connected to the fuel storage tank and the lower outlet extending into the fire flashover simulation chamber and extending into the combustion disk.

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