Experimental device for studying double-fire-source combustion characteristics of longitudinal ventilation downwards-inclined tunnel

Abstract

The utility model discloses an experimental device for studying double-fire-source combustion characteristics of a longitudinal ventilation downwards-inclined tunnel. The experimental device can conveniently replace a site, change ventilation conditions and ensure the stability when the gradient of the simulated tunnel is rapidly adjusted. According to the technical scheme, the device comprises a supporting plane steel frame, a detection unit, an image acquisition unit and an air supply device, a longitudinal airflow device and a simulation tunnel are arranged above the supporting plane steel frame, the detection unit is arranged in the simulation tunnel, the image acquisition unit is arranged on one side of the simulation tunnel, and the air supply device is connected with two combustors at the bottom of the simulation tunnel through pipelines; a supporting foot stool and an inclination angle fixing frame are arranged below the supporting plane steel frame, the supporting foot stool is hinged to the middle of the supporting plane steel frame through a first pin shaft, a protractor is arranged at the top of one side of the supporting foot stool, and the top of the inclination angle fixing frame is hinged to the end of the supporting plane steel frame through a second pin shaft. And a hydraulic jack is arranged below the second pin shaft.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of tunnel fire safety, and particularly relates to an experimental device for researching burning characteristics of double fire sources in an inclined tunnel under longitudinal ventilation. BACKGROUND

[0002] The statements in this part only provide background technical information related to the utility model and do not necessarily constitute prior art.

[0003] Double fire source burning refers to the case that two fire sources burn simultaneously in a fire scene. In the case of double fire source burning, the fire sources may influence each other, leading to more complex burning behavior. For the burning characteristics of double fire sources, the main research object is the flame characteristics of a double flame array in an open space. However, in a tunnel or other channel-shaped space, the burning behavior of double fire sources in the tunnel is subject to the constraints of the ceiling and surrounding walls. Meanwhile, it can be known from the characteristics and hazards of tunnel fires that fire smoke is the main factor that endangers personnel safety and hinders evacuation and rescue.

[0004] In the prior art, double fire sources are located in the center of a longitudinal array of a horizontal tunnel, and there is still a lack of in-depth research on tunnels under inclined conditions, especially in the case of different inclination angles, fire source spacings, and flame shapes. When conducting simulation experiments on tunnels under inclined conditions, the height of one end is usually adjusted by using a pad, or a certain point on the top of the room is used as a fixed point, and a hinge is used to lift one end and adjust the height. However, this method lacks convenience and safety in terms of changing the site, changing the ventilation conditions, and adjusting the slope of the tunnel. UTILITY MODEL CONTENTS

[0005] In view of the above problems, the experimental device for researching burning characteristics of double fire sources in an inclined tunnel under longitudinal ventilation can conveniently change the site, change the ventilation conditions, and quickly adjust the slope of the experimental tunnel when performing small-size experimental simulation, and can ensure the stability of the experimental device when adjusting the slope of the simulation tunnel.

[0006] To achieve the above purpose, the utility model is realized by the following technical scheme:

[0007] The utility model provides an experimental device for researching burning characteristics of double fire sources in an inclined tunnel under longitudinal ventilation, comprising: a supporting plane steel frame, a longitudinal airflow device, a simulation tunnel, a detection unit, an image acquisition unit, and a gas supply device.

[0008] The longitudinal airflow device and the simulation tunnel are arranged above the supporting plane steel frame, the detection unit is arranged in the simulation tunnel, the image acquisition unit is arranged on one side of the simulation tunnel, and the gas supply device is connected to two burners at the bottom of the simulation tunnel through a pipeline.

[0009] The lower part of the support plane steel frame is provided with a support foot and an inclined angle fixing frame, the support foot is hinged to the middle part of the simulated tunnel through a first pin shaft, the top of one side of the support foot is provided with a protractor, the top of the inclined angle fixing frame is hinged to the end of the support plane steel frame through a second pin shaft, the lower part of the second pin shaft is provided with a hydraulic jack for adjusting the inclined angle of the support plane steel frame, and a pin shaft fixing seat is arranged between the second pin shaft and the hydraulic jack.

[0010] Further, the longitudinal air flow device is composed of a fan, a telescopic plastic air pipe and a flow straightener, and is sequentially connected through flanges, and the outer part of the flow straightener is composed of a square pipe and multiple built-in round pipes.

[0011] Further, one end of the flow straightener is connected with the telescopic plastic air pipe, and the other end is connected with one end of the simulated tunnel through a flange.

[0012] Further, the detection unit comprises a sensor frame installed on the top and inside of the simulated tunnel, and a thermocouple and a flue gas sensor are installed on the sensor frame.

[0013] Further, one end of the flow straightener is connected with the telescopic plastic air pipe, and the other end is connected with one end of the simulated tunnel through a flange.

[0014] Further, the image acquisition unit is a DV camera, which is used for collecting the flame and flue gas shape.

[0015] Further, the gas supply device is two high-pressure gas cylinders, which are used for supplying gas to two burners, a pressure reducing valve is arranged between the high-pressure gas cylinder and the pipeline, and a flow meter is further arranged on the pipeline, which is used for controlling the longitudinal air flow.

[0016] Further, the simulated tunnel is a rectangular structure with open ends, one side of the simulated tunnel is fireproof glass, and the top, bottom and the other side of the simulated tunnel are fireproof gypsum boards.

[0017] Further, a plurality of fixed angle irons are uniformly arranged on the two sides of the bottom plate of the simulated tunnel, the fixed angle irons are fixedly connected with the bottom plate of the simulated tunnel through fasteners, and are used for preventing the simulated tunnel from moving to both sides on the support plane steel frame.

[0018] Further, an anti-skid fixing rod is further arranged on the bottom plate of the simulated tunnel, and an anti-skid fixing rod is also arranged on the bottom of the longitudinal air flow device, which is used for preventing the simulated tunnel from sliding at different inclined angles.

[0019] Compared with the prior art, the utility model has the advantages and positive effects that:

[0020] The utility model discloses a hydraulic jack and protractor structure can be accurate adjustment support plane steel frame's inclination angle, can simulate longitudinal ventilation condition under the environment of the inclined tunnel, to research the tunnel double fire combustion characteristic under different inclination angle, through support plane steel frame and hydraulic jack hinged, has guaranteed the stability problem of simulation tunnel in the adjustment process of different inclination angle.

[0021] The utility model discloses can add or remove longitudinal air current device as needed, and the forced ventilation and natural ventilation condition under the double fire combustion situation of convenient inquiry is explored, through fixed angle iron, antiskid fixed link etc. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings accompanying the specification illustrate preferred embodiments of the utility model, and together with the description, serve to explain the principles of the utility model.

[0023] Figure 1 It is the front view of the whole structure of the utility model experimental device;

[0024] Figure 2 It is the rear view of the whole structure of the utility model experimental device;

[0025] Figure 3 It is the support foot structure diagram of the utility model;

[0026] Figure 4 It is the support plane steel frame structure diagram of the utility model;

[0027] Figure 5 It is the longitudinal air current device structure diagram of the utility model;

[0028] Figure 6 It is the fixed angle iron structure diagram of the utility model;

[0029] Figure 7 It is the inclination angle fixing frame structure diagram of the utility model.

[0030] In the diagram: 1. Supporting leg; 2. Supporting planar steel frame; 3. Simulated tunnel; 4. Sensor frame; 5. Thermocouple; 6. Burner; 7. Bearing; 8. Fireproof glass; 9. Mounting hole; 10. Flue gas sensor; 11. First pin; 12. Steel plate; 13. Protractor; 14. High-pressure gas cylinder; 15. Fireproof gypsum board; 16. Fixed angle iron; 17. Fastener; 18. Anti-slip fixing rod; 19. Rectifier; 20. Telescopic plastic duct; 21. Fan; 22. Flange; 23. Laser device; 24. Image acquisition unit; 25. Pressure reducing valve; 26. Flow meter; 27. Hydraulic control lever; 28. Pin fixing seat; 29. ​​Second pin; 30. Hydraulic jack; 31. Round pipe. Detailed Implementation

[0031] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise expressly indicated by the present invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0033] This embodiment discloses an experimental apparatus for studying the combustion characteristics of a dual-ignition-source tunnel under longitudinal ventilation, such as... Figures 1-7 As shown, it includes: a support frame 1, a support plane steel frame 2, a longitudinal airflow device, a simulated tunnel 3, a detection unit, an image acquisition unit 24, and an air supply device; the longitudinal airflow device and the simulated tunnel 3 are arranged above the support plane steel frame 2, the detection unit is arranged in the simulated tunnel 3, the image acquisition unit 24 is arranged on one side of the simulated tunnel 3, and the air supply device is connected to two burners 6 at the bottom of the simulated tunnel 3 through a pipe; the support frame 1 and the tilt angle fixing frame are arranged below the support plane steel frame 2, the support frame 1 is hinged to the middle of the simulated tunnel 3 through a first pin 11, a protractor 13 is arranged on the top of one side of the support frame 1, the top of the tilt angle fixing frame is hinged to the end of the support plane steel frame 2 through a second pin 29, a hydraulic jack 30 is arranged below the second pin 29 for adjusting the tilt angle of the support plane steel frame 2, and a pin fixing seat 28 is arranged between the second pin 29 and the hydraulic jack 30.

[0034] The support frame 1 is welded by steel material, the bottom is rectangular, the two sides are triangular stable structure, the top corner is connected by bearing 7, first pin shaft 11 and support plane rigid frame, two triangular frames are connected by two steel strips to ensure stability; the bottom of the hydraulic jack 30 is provided with steel plate 12, the bottom of the hydraulic jack 30 is also provided with hydraulic control rod 27, which is used for controlling the hydraulic jack 30 and adjusting the inclination angle of the support plane steel frame 2, so as to ensure the stability of the simulated tunnel during angle adjustment.

[0035] The longitudinal airflow device is composed of fan 21, telescopic plastic air pipe 20 and flow regulator 19, and is connected in sequence through flange 22, the outside of the flow regulator 19 is square pipe and multiple built-in circular pipes 31. The longitudinal airflow device can be installed on the support plane steel frame 2 when exploring forced ventilation conditions of the tunnel, and can be disassembled when exploring natural ventilation conditions.

[0036] One end of the flow regulator 19 is connected with the telescopic plastic air pipe 20, and the other end is connected with one end of the simulated tunnel 3 through flange 22.

[0037] The detection unit includes sensor frame 4 installed on the top and inside of the simulated tunnel 3; thermocouple 5 and flue gas sensor 10 are installed on the sensor frame 4.

[0038] The end of the simulated tunnel 3 away from the longitudinal airflow device is provided with laser device 23 for rendering flue gas.

[0039] The image acquisition unit 24 is a DV camera for collecting flame and flue gas shape.

[0040] The gas supply device is two high-pressure gas cylinders 14 for supplying gas to two burners 6, the high-pressure gas cylinders 14 are provided with pressure reducing valve 25 between the high-pressure gas cylinders 14 and the pipeline, and flow meter 26 is also arranged on the pipeline for controlling the longitudinal gas flow.

[0041] The simulated tunnel 3 is a rectangular structure with two open ends, one side of the simulated tunnel 3 is fireproof glass 8, and the top, bottom and the other side of the simulated tunnel 3 are fireproof gypsum board 15.

[0042] The bottom plate of the simulated tunnel 3 is uniformly provided with multiple fixed angle irons 16 on both sides, the support plane steel frame 2 is provided with mounting hole 9 at the corresponding position, the fixed angle iron 16 is fixedly connected with the bottom plate of the simulated tunnel 3 through fastener 17, which is used for preventing the simulated tunnel 3 from moving to both sides on the support plane steel frame 2.

[0043] The bottom plate of the simulation tunnel 3 is also provided with anti-skid fixing rods 18, and the bottom of the longitudinal airflow device is also provided with anti-skid fixing rods 18, which are used for preventing the simulation tunnel 3 from sliding at different inclination angles.

[0044] The experimental device also comprises a computer, and the detection unit and the image acquisition unit 24 are connected with the computer, which is used for collecting and analyzing the influence mechanism of the flame characteristics of the double fire sources in the inclined tunnel.

[0045] The use steps of the experimental device are as follows:

[0046] S1, debugging before experiment: test the level meter, ensure that the experimental table is in a horizontal state before the experiment starts, the instrument works normally and is normally connected with the computer; ensure that the thermocouple 5 and the flue gas sensor 10 are installed in the correct position, work well and are normally connected with the computer; ensure that the DV camera and the laser device 23 work normally and can record the double fire source combustion behavior in real time;

[0047] S2, according to the requirements of the experiment, arrange the experimental burner 6 and the longitudinal airflow device, adjust the height of the supporting plane to change the slope of the simulation tunnel 3, and read the experimental inclination angle according to the scale of the protractor 13 on the supporting foot 1;

[0048] S3, start the detection device, and open the computer to record the experimental data collected by the detection device;

[0049] S4, ignite the burner 6 and keep it burning by itself, and save the temperature data in the computer when the combustion is finished;

[0050] S5, after the temperature of the experimental device returns to normal temperature and the flue gas is completely discharged, modify the slope, the distance between the burners 6 and other parameters, continue the test, and after all the variable tests are finished, place the tunnel on the supporting table, turn off all the electronic experimental equipment, and the experiment is finished;

[0051] S6, analysis of experimental data: obtain the temperature distribution law of the top of the simulation tunnel 3 and the flue gas distribution law in the simulation tunnel 3 during the double fire source combustion process through the thermocouple 5 and the flue gas sensor 10; obtain the flame shape, flame fusion and flue gas distribution image through the recording of the DV camera; analyze the influence mechanism of each factor on the flame characteristics of the double fire sources in the inclined tunnel, and clarify the characteristics and evolution law of the flame and flue gas during the double fire source combustion in the inclined tunnel under different conditions.

[0052] Although the specific embodiments of the utility model have been described in combination with the drawings, it is not a limitation on the protection scope of the utility model, and those skilled in the art should understand that various modifications or deformations made by those skilled in the art on the basis of the technical scheme of the utility model without creative labor are still within the protection scope of the utility model.

Claims

1. An experimental device for studying the characteristics of double fire combustion in an inclined tunnel under longitudinal ventilation, characterized in that, The utility model relates to a tunnel fire simulation device, including: Supporting plane steel frame, longitudinal air flow device, simulation tunnel, detection unit, image acquisition unit and air supply device; The longitudinal air flow device and simulation tunnel are arranged above the supporting plane steel frame, the detection unit is arranged in the simulation tunnel, the image acquisition unit is arranged on one side of the simulation tunnel, and the air supply device is connected with two burners at the bottom of the simulation tunnel through a pipeline; A supporting foot stand and an inclination angle fixing frame are arranged below the supporting plane steel frame, the supporting foot stand is hingedly connected to the middle part of the simulation tunnel through a first pin shaft, an angle gauge is arranged on the top of one side of the supporting foot stand, the inclination angle fixing frame is hingedly connected to the end of the supporting plane steel frame through a second pin shaft, a hydraulic jack is arranged below the second pin shaft and used for adjusting the inclination angle of the supporting plane steel frame, and a pin shaft fixing seat is arranged between the second pin shaft and the hydraulic jack.

2. The experimental apparatus for investigating the combustion characteristics of a two-fire source in an inclined tunnel with longitudinal ventilation according to claim 1, characterized in that, The longitudinal air flow device is composed of a fan, a telescopic plastic air pipe and a flow regulator and is sequentially connected through flanges, and the flow regulator is externally composed of a square pipe and internally composed of multiple round pipes.

3. The experimental apparatus for investigating the combustion characteristics of a two-fire source in an inclined tunnel with longitudinal ventilation according to claim 2, characterized in that, One end of the flow regulator is connected with the telescopic plastic air pipe, and the other end is connected with one end of the simulation tunnel through a flange.

4. The experimental apparatus for investigating the combustion characteristics of a two-fire source in an inclined tunnel with longitudinal ventilation according to claim 1, characterized in that, The detection unit comprises a sensor frame arranged on the top and inside of the simulation tunnel, and a thermocouple and a flue gas sensor are arranged on the sensor frame.

5. The experimental setup for investigating the burning characteristics of a sloping tunnel with longitudinal ventilation under double fire sources according to claim 1, wherein, A laser device is arranged at the end of the simulation tunnel away from the longitudinal air flow device and used for rendering flue gas.

6. The experimental setup for investigating the combustion characteristics of a sloping tunnel with longitudinal ventilation under double fire sources as claimed in claim 5 wherein, The image acquisition unit is a DV camera and is used for collecting the shape of flame and flue gas.

7. The experimental apparatus for investigating the combustion characteristics of a two-fire source in a sloping tunnel with longitudinal ventilation according to claim 1, characterized in that, The air supply device is two high-pressure gas cylinders and is used for supplying air to the two burners, a pressure reducing valve is arranged between the high-pressure gas cylinders and the pipeline, a flow meter is further arranged on the pipeline and is used for controlling the longitudinal air flow.

8. The experimental apparatus for investigating the combustion characteristics of a two-fire source in a sloping tunnel with longitudinal ventilation according to claim 1, characterized in that, The simulation tunnel is a cuboid structure with open ends, one side of the simulation tunnel is made of fireproof glass, and the top, bottom and other side of the simulation tunnel are made of fireproof gypsum board.

9. The experimental apparatus for investigating the combustion characteristics of a two-fire source in a sloping tunnel under longitudinal ventilation according to claim 1, characterized in that, Multiple fixed angle irons are uniformly arranged on both sides of the bottom plate of the simulation tunnel, the fixed angle irons are fixedly connected with the bottom plate of the simulation tunnel through fasteners and are used for preventing the simulation tunnel from moving to both sides on the supporting plane steel frame.

10. The experimental setup for investigating the burning characteristics of a sloping tunnel with longitudinal ventilation under dual-fire as claimed in claim 1, wherein, Anti-skid fixing rods are further arranged on the bottom plate of the simulation tunnel and the bottom of the longitudinal air flow device and are used for preventing the simulation tunnel from sliding at different inclination angles.

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