Flame abrupt change experimental device under multi-factor condition

Abstract

The utility model discloses a flame abrupt change experimental device under a multi-factor condition, and relates to the field of flame combustion experiments. Comprising a control center, a combustion chamber, a sample placing table installed in the combustion chamber, an ignition device installed above the sample placing table, an air pressure adjusting device used for adjusting the air pressure in the combustion chamber, and an oxygen concentration adjusting device used for adjusting the oxygen concentration in the combustion chamber. The air pressure adjusting device and the oxygen concentration adjusting device are both in signal connection with the control center. The problem that critical conditions of flame abrupt change phenomena in different areas are difficult to accurately simulate due to the fact that flame abrupt change experiments in the prior art cannot simulate pressure intensity and oxygen concentration in different areas is solved.

Description

Technical Field

[0001] The utility model relates to the field of flame combustion experiments, and specifically, to a flame mutation experiment device under multi-factor conditions. Background Art

[0002] The flame mutation analysis device is mainly used to capture the mutated flames under different environmental conditions, and obtain the relevant parameters when the flame mutation occurs through real-time information output. It can mainly prevent the occurrence and development of fires from the perspective of mutation, and minimize the losses caused by fires.

[0003] Most of the existing flame mutation analyses are based on numerical simulations and the flame mutation phenomena with single variables. Different pressures and oxygen concentrations in different regions will lead to different processes of fire occurrence and development, and the critical conditions for the occurrence of flame mutation phenomena are also different, which poses a great obstacle to fire prevention. Summary of the Utility Model

[0004] The utility model provides a flame mutation experiment device under multi-factor conditions to solve the problem in the prior art that the flame mutation experiment cannot simulate the pressures and oxygen concentrations in different regions, resulting in difficulty in accurately simulating the critical conditions of flame mutation phenomena in different regions.

[0005] To achieve the above object, the utility model provides the following scheme:

[0006] A flame mutation experiment device under multi-factor conditions includes a control center, a combustion chamber, a specimen placement table installed in the combustion chamber, an ignition device installed above the specimen placement table, a pressure adjustment device for adjusting the air pressure in the combustion chamber, and an oxygen concentration adjustment device for adjusting the oxygen concentration in the combustion chamber. The pressure adjustment device and the oxygen concentration adjustment device are both signal-connected to the control center.

[0007] The utility model adjusts the air pressure in the combustion chamber through the pressure adjustment device, adjusts the oxygen concentration in the combustion chamber through the oxygen concentration adjustment device, and the ignition device ignites the combustibles on the specimen placement table to achieve the purpose of simulating a fire, so as to simulate the pressures and oxygen concentrations in different regions, thereby simulating the processes of fire occurrence and development and the critical conditions of flame mutation phenomena in different regions, obtaining various data in the processes of fire occurrence and development in different regions, providing a theoretical basis for the prevention of fires in different regions, and thus achieving the purpose of fire prevention.

[0008] Further, it also includes a combustion product collection device arranged on the bottom plate of the combustion chamber, which is used to collect the products after sample combustion, facilitate the analysis of the mass change of the sample before and after combustion, and thus obtain the mass lost during the sample combustion process.

[0009] Further, it also includes a real-time mass detection device installed on the bottom plate of the combustion chamber, and the real-time mass detection device is signal-connected to the control center. The real-time mass detection device is used to detect the mass of the sample on the sample placement table in real time, facilitating the detection and recording of the mass change process of the sample before combustion, during combustion, and after combustion, further simulating the occurrence and development of a fire, and providing a theoretical basis for fire prevention.

[0010] Further, an angle adjustment device is provided at the weighing end of the real-time mass detection device, and the sample placement table is installed on the angle adjustment device. The angle of the sample placement table is adjusted through the angle adjustment device, so as to achieve the expected sample placement angle, adding a controllable variable to the experiment and improving the accuracy of the experiment.

[0011] Further, it also includes a flame capture assembly installed above the sample placement table. The flame capture assembly includes a photographing device and an information output device that are signal-connected to each other, and the information output device is signal-connected to the control center.

[0012] The original image during the combustion process of the sample is obtained through the photographing device, and the image data is analyzed and displayed in real time through the information output device and the control center, so as to analyze and identify the captured mutant flame.

[0013] Further, an internal pressure gauge is installed inside the combustion chamber, and a vacuum pressure gauge is installed on the outer surface of the combustion chamber. Both the internal pressure gauge and the vacuum pressure gauge are signal-connected to the control center.

[0014] The pressure inside the combustion chamber adjusted by the pressure adjustment device is measured through the internal pressure gauge, and the internal pressure, vacuum degree, and differential pressure inside the combustion chamber are measured through the vacuum pressure gauge and transmitted to the control center for analysis, facilitating the obtaining of the pressure data of the fire experiment.

[0015] Further, it also includes a thermal flowmeter for measuring the gas flow inside the combustion chamber. The thermal flowmeter is used to measure the flow of gas and steam inside the combustion chamber.

[0016] Further, it also includes a temperature measurement device for measuring the temperature inside the combustion chamber, and the temperature measurement device is signal-connected to the control center.

[0017] Further, it also includes an oxygen concentration detector for measuring the oxygen content inside the combustion chamber. The real-time oxygen concentration inside the combustion chamber is detected through the oxygen concentration detector.

[0018] Further, the ignition device includes an ignition assembly disposed outside the combustion chamber and a nozzle located inside the combustion chamber. The nozzle is located above the specimen placement table. The ignition assembly includes an ignition switch, a pressure elastic member, and an impact member connected in sequence, and further includes a piezoelectric ceramic, a phosphor bronze sheet mounted on one side of the impact member, a high-voltage coil connected to the phosphor bronze sheet, a spark plug connected to the high-voltage coil, and a gas fuel chamber located at one end of the spark plug. The nozzle is communicated with the spark plug.

[0019] The ignition assembly generates a high-voltage current, causing the spark plug to generate an electric spark that can penetrate the gas, thereby generating a high-temperature and high-pressure spark, enabling fuel molecules to further form a flame and ejecting from the nozzle to ignite the sample on the specimen placement table.

[0020] The working principle of this experimental device: Fix the combustion sample through the fixing device on the specimen placement platform, connect and turn on the air pressure regulating device, oxygen concentration regulating device, information output device, and flame capture assembly, adjust the pressure and oxygen concentration in the combustion chamber, observe the oxygen concentration and pressure data in the combustion chamber from the information output device until the required oxygen concentration and pressure environment are adjusted. Start the ignition device, utilize the interaction of electromagnetic induction and spark discharge to ignite the sample, and through the information output device, monitor in real time the flame mutation phenomenon and the change law of its characteristic parameters during the combustion of the specimen under different pressures, oxygen concentrations, and placement angles, capture and analyze the flame mutation phenomenon that occurs during the combustion of the sample under the influence of factors such as pressure, oxygen concentration, and placement angle. The information output device obtains the original image through a high-definition camera, transmits it to the control center, preprocesses the original image including denoising, smoothing filtering, etc., converts it into a grayscale image, performs binarization processing, performs necessary post-processing operations on the binarized image including morphological filtering, edge detection, etc., sets the three-sided information of the flame, sets the obtained threshold in the system, and defines this as a mutation. Finally, output the processed binarized image to a file, so as to analyze and identify the captured mutant flame. According to this device, study the flame development process, capture the key points of flame mutation, so as to be applied in actual fires to prevent or control fires from the mutation process.

[0021] One or more technical solutions provided by the present utility model have at least the following technical effects or advantages:

[0022] (1) The present utility model is provided with the coordinated use of a real-time quality detection device, a temperature measurement device, an oxygen concentration detector, an internal pressure gauge, etc., which is convenient for analyzing the mass change of the sample before and after combustion, the temperature change during the combustion process, the combustion process of the sample in different oxygen concentration environments, and the combustion process of the sample in different pressure environments. It has the advantage of realizing multiple functions with the same device, can simulate the combustion process in different altitude areas, and thus prevent and control the occurrence and development of fires;

[0023] (2) By the combined use of an ignition device, an angle adjustment device, and a combustion product collection device, it has the advantages of igniting the sample in a stable environment, observing the combustion process of the sample at a specific angle, and measuring the mass change before and after combustion. It can simulate the combustion process of the sample under different scenarios and capture the sudden change process of the fire. Brief Description of the Drawings

[0024] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of the present invention, and do not limit the embodiments of the present invention;

[0025] Figure 1 It is a schematic diagram of the overall structure of the experimental device in the present invention;

[0026] Figure 2 It is a schematic diagram of the structure of the ignition device in the present invention;

[0027] Among them, 1 - combustion chamber, 2 - air pressure adjustment device, 3 - internal pressure gauge, 4 - temperature measurement device, 5 - ignition device, 501 - nozzle, 502 - ignition switch, 503 - pressure elastic member, 504 - impact member, 505 - piezoelectric ceramic, 506 - phosphor bronze sheet, 507 - high - voltage coil, 6 - vacuum pressure gauge, 7 - thermal flowmeter, 8 - oxygen concentration adjustment device, 9 - information output device, 10 - oxygen concentration detector, 11 - combustion product collection device, 12 - shooting device, 13 - real - time mass detection device, 14 - angle adjustment device, 15 - specimen placement table. Detailed Embodiment

[0028] In order to more clearly understand the above - mentioned objects, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0029] Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described within the scope here. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0030] Embodiment 1

[0031] This embodiment provides a flame mutation experimental device under multi - factor conditions, as Figure 1 - Figure 2As shown in the figure, it includes a control center, a combustion chamber 1, a specimen placement table 15 installed inside the combustion chamber 1, an ignition device 5 installed above the specimen placement table 15, a pressure regulating device 2 for regulating the air pressure inside the combustion chamber 1, and an oxygen concentration regulating device 8 for regulating the oxygen concentration inside the combustion chamber 1. The pressure regulating device 2 and the oxygen concentration regulating device 8 are both signal-connected to the control center.

[0032] Among them, the control center can be a PLC, a computer, etc. Since the combustion chamber 1 needs to regulate the internal pressure and oxygen content, it is preferably a sealable box body, which can be made of kovar alloy and has low thermal conductivity. The specimen placement table 15 is preferably made of high-temperature resistant materials, also preferably kovar alloy. The upper surface of the specimen placement table 15 is provided with buckles for fixing the sample; the ignition device 5 is preferably an electric ignition device, the pressure regulating device 2 is preferably a vacuum pump, and the internal pressure of the combustion chamber 1 is controlled by introducing or extracting gas into the combustion chamber 1. The oxygen concentration regulating device 8 includes an oxygen cylinder and other gas cylinders equipped with pressure reducing valves, which can be an air cylinder, an inert gas cylinder, etc. The oxygen content inside the combustion chamber 1 is increased by introducing high-concentration oxygen into the combustion chamber 1, and then the oxygen content is reduced by introducing air or other inert gases into the combustion chamber 1.

[0033] In a more preferred embodiment, it further includes a combustion product collection device 11 arranged on the bottom plate of the combustion chamber 1.

[0034] The combustion product collection device 11 is a groove opened on the bottom plate of the combustion chamber 1, preferably set as a drawer-like structure for easy removal.

[0035] In a more preferred embodiment, it further includes a real-time mass detection device 13 installed on the bottom plate of the combustion chamber 1, and the real-time mass detection device 13 is signal-connected to the control center. The real-time mass detection device 13 is preferably a high-precision electronic scale.

[0036] In a more preferred embodiment, an angle adjustment device 14 is provided at the weighing end of the real-time mass detection device 13, and the specimen placement table 15 is installed on the angle adjustment device 14. The angle adjustment device 14 is a rotator provided with a damping device. After the specimen placement table 15 is placed on it, a rotating platform with damping is formed, and the inclination angle of the specimen placement table 15 can be adjusted arbitrarily.

[0037] In a more preferred embodiment, it further includes a flame capture assembly installed above the specimen placement table 15. The flame capture assembly includes a photographing device 12 and an information output device 9 that are signal-connected to each other, and the information output device 9 is signal-connected to the control center. The photographing device 12 is preferably a high-definition camera or a high-definition video camera, and the information output device 9 is preferably a display screen or a notebook computer display screen.

[0038] In a more preferred embodiment, an internal pressure gauge 3 is installed inside the combustion chamber 1, and a vacuum pressure gauge 6 is installed on the outer surface of the combustion chamber 1. Both the internal pressure gauge 3 and the vacuum pressure gauge 6 are signal-connected to the control center.

[0039] In a more preferred embodiment, it further includes a thermal flowmeter 7 for measuring the gas flow inside the combustion chamber 1.

[0040] In a more preferred embodiment, it further includes a temperature measuring device 4 for measuring the temperature inside the combustion chamber 1, and the temperature measuring device 4 is signal-connected to the control center.

[0041] In a more preferred embodiment, it further includes an oxygen concentration detector 10 for measuring the oxygen content inside the combustion chamber 1.

[0042] Embodiment 2

[0043] Based on Embodiment 1, as Figure 1 - Figure 2 shown, the ignition device 5 includes an ignition assembly arranged outside the combustion chamber 1 and a nozzle 501 located inside the combustion chamber 1. The nozzle 501 is located above the specimen placement table 15. The ignition assembly includes an ignition switch 502, a pressure elastic member 503, and an impact member 504 connected in sequence. It further includes a piezoelectric ceramic 505, a phosphor bronze sheet 506 installed on one side of the impact member 504, a high-voltage coil 507 connected to the phosphor bronze sheet 506, a spark plug connected to the high-voltage coil 507, and a gas fuel chamber located at one end of the spark plug. The nozzle 501 is communicated with the spark plug.

[0044] Among them, the nozzle orifice of the nozzle 501 faces the direction of fixing the sample on the specimen placement table 15. Since the specimen placement table 15 is rotatable, therefore, the sample is preferably fixed at the rotation center of the specimen placement table 15, and the nozzle orifice of the nozzle 501 also faces the rotation center of the specimen placement table 15. The nozzle 501 is preferably set as a telescopic structure to prevent the nozzle 501 from being too close to or too far away from the sample; the pressure elastic member 503 is preferably a pressure spring, and both ends of the pressure spring are respectively connected to the ignition switch 502 and the impact member 504. There is a certain limit between the impact member 504 and the housing of the ignition device 5. When the ignition switch 502 is pressed for a certain time, the pressure spring compresses, and its restoring force reaches a certain magnitude before it can push the impact member 504 forward. After hitting the piezoelectric ceramic 505, a high-voltage pulse current is generated on the phosphor bronze sheet 506 for spark plug ignition.

[0045] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0046] Obviously, those skilled in the art can make various modifications and variations to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model is also intended to include these modifications and variations.

Claims

1. A flame mutation experimental device under multi-factor conditions, characterized in that: The invention comprises a control center, a combustion chamber (1), a sample placement table (15) installed in the combustion chamber (1), an ignition device (5) installed above the sample placement table (15), an air pressure regulating device (2) for regulating the air pressure in the combustion chamber (1), and an oxygen concentration regulating device (8) for regulating the oxygen concentration in the combustion chamber (1), wherein the air pressure regulating device (2) and the oxygen concentration regulating device (8) are both connected to the control center signal.

2. The flame mutation experimental device under multi-factor conditions according to claim 1 is characterized in that: It also includes a combustion product collection device (11) arranged on the bottom plate of the combustion chamber (1).

3. The flame mutation experimental device under multi-factor conditions according to claim 1 is characterized in that: It also includes a real-time quality detection device (13) installed on the bottom plate of the combustion chamber (1), and the real-time quality detection device (13) is connected to the control center signal.

4. The flame mutation experiment device under multi-factor conditions according to claim 3 is characterized in that: The weighing end of the real-time quality detection device (13) is provided with an angle adjustment device (14), and the sample placement table (15) is installed on the angle adjustment device (14).

5. The flame mutation experiment device under multi-factor conditions according to claim 1 is characterized in that: It also includes a flame capture component installed above the sample placement table (15), the flame capture component including a shooting device (12) and an information output device (9) which are signal-connected to each other, and the information output device (9) is signal-connected to a control center.

6. The flame mutation experiment device under multi-factor conditions according to claim 1 is characterized in that: An internal pressure gauge (3) is installed in the combustion chamber (1), and a vacuum pressure gauge (6) is installed on the outer surface of the combustion chamber (1). Both the internal pressure gauge (3) and the vacuum pressure gauge (6) are connected to the control center signal.

7. The flame mutation experiment device under multi-factor conditions according to claim 1 is characterized in that: It also includes a thermal flow meter (7) for measuring the gas flow inside the combustion chamber (1).

8. The flame mutation experiment device under multi-factor conditions according to claim 1 is characterized in that: It also includes a temperature measuring device (4) for measuring the internal temperature of the combustion chamber (1), and the temperature measuring device (4) is connected to the control center signal.

9. The flame mutation experiment device under multi-factor conditions according to claim 1 is characterized in that: It also includes an oxygen concentration detector (10) for measuring the oxygen content inside the combustion chamber (1).

10. The flame mutation experiment device under multi-factor conditions according to claim 1 is characterized in that: The ignition device (5) comprises an ignition assembly arranged outside the combustion chamber (1) and a nozzle (501) located in the combustion chamber (1); the nozzle (501) is located above the sample placement table (15); the ignition assembly comprises an ignition switch (502), a pressure elastic member (503) and an impact member (504) connected in sequence; and further comprises a piezoelectric ceramic (505) installed on one side of the impact member (504), a phosphor copper sheet (506), a high-voltage coil (507) connected to the phosphor copper sheet (506), a spark plug connected to the high-voltage coil (507) and a gas fuel chamber located at one end of the spark plug; the nozzle (501) is connected to the spark plug.

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