Improved shock wave winding dust secondary explosion experiment device

Abstract

The utility model discloses an improved shock wave winding dust secondary explosion experimental device in the technical field of shock wave winding dust secondary explosion, which comprises an explosion ignition component and a data acquisition control component, and a product collection component is arranged at the top of the explosion ignition component. A dust spraying assembly and an air supply assembly are arranged on one side of the explosion ignition assembly, the explosion ignition assembly comprises a main pipe, the bottom of the main pipe is connected with a branch pipe through a flange, adapters are arranged at the joint of the main pipe and the branch pipe and comprise an O-degree adapter, a 30-degree adapter and a 45-degree adapter, and an explosion head cover is installed on the right side of the main pipe. The main pipe, the branch pipe, the explosion head cover, the ignition electrode, the ignition controller, the first explosion tail cover, the branch pipe, the air supply assembly and the dust spraying assembly are arranged in a matched mode, meanwhile, the O-degree adapter, the 30-degree adapter and the 45-degree adapter are arranged at the flange connecting position of the main pipe and the branch pipe, and experiment testing can be conducted on explosion parameters in the branch pipes at different corners.

Description

Technical Field

[0001] This utility model relates to the technical field of shock wave dust secondary explosion, and in particular to an improved shock wave dust secondary explosion experimental device. Background Technology

[0002] The interaction between shock waves and combustible dust, inducing a chemically reactive two-phase flow, is an extremely complex physical phenomenon directly related to the frequent occurrence of dust explosions. In actual explosions, secondary explosions caused by shock waves entraining dust are an important form of dust explosion, commonly seen in coal mine tunnels where methane explosions trigger coal dust, leading to secondary explosions. The danger posed by such secondary explosions of combustible dust caused by shock waves is greater than that of pure gas explosions. Experimental setups can be used to simulate secondary explosions of dust entrained by shock waves and to conduct related research.

[0003] Patent publication number CN217638810U discloses an experimental device for secondary explosion of dust using shock waves. The device comprises a main body and three supporting systems. The main body consists of two horizontal shock tubes connected by a flange in the middle. The three systems are a gas distribution system, an ignition and control system, and a dynamic data acquisition and analysis system. The gas distribution system includes a vacuum pump, an intake and exhaust system, and a high-precision vacuum pressure gauge. The ignition and control system includes an ignition head or resistance wire without explosive charge. The data acquisition system includes sensors, a charge amplifier, a pressure data acquisition instrument, a high-speed camera, a temperature sensor, and an infrared thermal imager. The experimental device of this invention can perform various experiments such as gas explosion, dust explosion, shock wave dust explosion, dust venting explosion, and dust explosion suppression, making it more convenient and efficient. When igniting the device, it is convenient and quick to replace the device and reinstall the ignition head without disassembling the device. It is also more convenient to replace test samples and assemble the device. However, the above-mentioned device connects pipe I and pipe II through a flange to form a horizontal pipeline during the experiment, which has a relatively simple function and cannot realize the experimental testing of explosion parameters in branch pipes at different bends. Utility Model Content

[0004] To address the issue that the existing device, which connects pipe I and pipe II via flanges to form a horizontal pipeline during experiments, has a limited function and cannot experimentally test the explosion parameters within branch pipes at different bends, this invention provides an improved shock wave dust secondary explosion experimental device.

[0005] This utility model provides an improved experimental device for secondary explosion of dust caused by shock wave convection, which adopts the following technical solution:

[0006] An improved shock wave dust secondary explosion experimental device includes an explosion ignition component and a data acquisition and control component. A product collection component is provided on the top of the explosion ignition component, and a dust spraying component and an air supply component are respectively provided on one side of the explosion ignition component.

[0007] The explosion ignition assembly includes a main pipe, a branch pipe connected to the bottom of the main pipe via a flange, and an adapter at the connection between the main pipe and the branch pipe. The adapter includes a 0° adapter, a 30° adapter, and a 45° adapter. An explosion head cover is installed on the right side of the main pipe. An ignition electrode is connected to the side of the explosion head cover closest to the center of the main pipe. An ignition controller is installed at the end of the explosion head cover away from the ignition electrode. A first explosion tail cover is installed on the left side of the main pipe, and a second explosion tail cover is installed at the bottom of the branch pipe.

[0008] By adopting the above technical solution, the explosion cover is first opened to check that the inside of the main pipe is clean and free of residue. Then the explosion cover is closed tightly. There is a flange connection between the main pipe and the ignition electrode for installing the explosion-proof membrane. After the explosion-proof membrane is installed, a certain amount of combustible dust is spread on the main pipe. The computer is controlled by the data acquisition and control component to close all valves, unscrew the dust storage tank, put in an appropriate amount of powder, tighten the dust storage tank, open the product collection component to extract the air in the main pipe and discharge it to the atmosphere. After extraction, the product collection component is closed. Then the air supply component is opened by the data acquisition and control component to fill the main pipe with a certain concentration of premixed gas. Then the air supply component is closed. Then the dust spray component is opened to spray dust into the branch pipe. At the same time, the ignition delay time of the ignition controller is set, and the ignition action is automatic. By setting 0° adapters, 30° adapters and 45° adapters at the flange connection between the main pipe and the branch pipe, the explosion parameters in the branch pipe at different corners can be experimentally tested.

[0009] Optionally, a dust spray port is provided at the bottom of the main tube near the first explosive tail cap.

[0010] By adopting the above technical solution, the dust spraying component can be moved to the preset dust spraying port of the main pipe to perform dust spraying action on the main pipe.

[0011] Optionally, a first glass window is installed on both the front and rear sides of the main pipe, and a second glass window is installed on both the front and rear sides of the branch pipe.

[0012] By adopting the above technical solution, and through the combination of the first and second glass windows, it is convenient to record the flames inside the main pipe and branch pipes with a high-speed camera, and it is also used for schlieren recording of explosion shock waves.

[0013] Optionally, the data acquisition and control component includes a data acquisition unit and a computer. A plurality of first pressure sensors are connected to the inner wall of the main pipe, and a plurality of second pressure sensors are connected to the inner wall of the branch pipe. The output terminals of the first and second pressure sensors are electrically connected to the input terminal of the data acquisition unit, and the output terminal of the data acquisition unit is electrically connected to the input terminal of the computer.

[0014] By adopting the above technical solution, the pressure inside the main pipe is detected by the first pressure sensor, the pressure inside the branch pipe is detected by the second pressure sensor, and the pressure value is transmitted to the computer by the data acquisition unit. Personnel can read the readings of the first and second pressure sensors through the computer.

[0015] Optionally, the air supply assembly includes two gas storage cylinders, with a flow control valve, an air inlet control valve, and a shut-off valve sequentially connected to the top of the two gas storage cylinders. The output terminal of the computer is electrically connected to the input terminals of the flow control valve, the air inlet control valve, and the shut-off valve, respectively.

[0016] By adopting the above technical solution, combustible gas and air are stored in two gas cylinders respectively. By opening the flow control valve, the air intake control valve and the closing valve, the mixed gas can be filled into the main pipe.

[0017] Optionally, the dust spraying assembly includes a dust storage control start valve, with a dust storage tank connected to the end of the dust storage control start valve away from the branch pipe. A third pressure sensor is installed on the dust storage tank. An inflation control valve, a flow regulating valve, and a compressed air cylinder are sequentially connected to the end of the dust storage tank away from the dust storage control start valve. The output terminal of the computer is electrically connected to the input terminals of the dust storage control start valve, the inflation control valve, and the flow regulating valve, respectively. The output terminal of the third pressure sensor is electrically connected to the input terminal of the data acquisition unit.

[0018] By adopting the above technical solution, the inflation control valve and flow regulation valve are opened to pressurize the dust storage tank. When the reading on the third pressure sensor reaches the predetermined value, the inflation control valve and flow regulation valve are closed to spray dust onto the branch pipe.

[0019] Optionally, the product collection assembly includes a closed control valve, with a gas intake control valve and a vacuum control valve connected to the side of the closed control valve away from the main pipe, respectively. A dust collector and an air bag are sequentially connected to the end of the gas intake control valve away from the closed control valve, and a vacuum pump is connected to the end of the vacuum control valve away from the closed control valve. The output terminal of the computer is electrically connected to the input terminals of the closed control valve, the gas intake control valve, the dust collector, the vacuum control valve, and the vacuum pump, respectively.

[0020] By adopting the above technical solution, after the explosion is completed, the closed control valve, the gas intake control valve and the dust collector are opened to collect the gas into the inside of the airbag. After the gas is completely pumped out, the closed control valve, the gas intake control valve and the dust collector are closed, and the powder storage box in the dust collector is taken out. This facilitates the detection and analysis of the gas in the airbag and the powder in the powder storage box, and achieves effective collection of the explosion products in the pipeline.

[0021] In summary, this utility model has at least one of the following beneficial effects:

[0022] By coordinating the main pipe, branch pipe, explosion cap, ignition electrode, ignition controller, first explosion tail cap, branch pipe, air supply assembly, and dust spray assembly, and by installing 0°, 30°, and 45° adapters at the flange connections of the main pipe and branch pipe, it is possible to conduct experimental tests on the explosion parameters in branch pipes at different bends.

[0023] By using a combination of a closed control valve, a gas intake control valve, a dust collector, and an airbag, the explosion products inside the pipeline can be effectively collected. The airbag collects the gas, and the dust collector collects the powder.

[0024] By setting first glass windows on the front and rear sides of the main pipe and second glass windows on the front and rear sides of the branch pipe, it is convenient to use a high-speed camera to record the flames inside the main pipe and branch pipe, and it can also be used for schlieren recording of explosion shock waves, thus realizing the visualization study of the pipeline. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the O° adapter structure of this utility model;

[0028] Figure 3 This is a schematic diagram of the 30° adapter structure of this utility model;

[0029] Figure 4 This is a schematic diagram of the 45° adapter structure of this utility model.

[0030] In the diagram: 1. Explosion ignition assembly; 101. Main pipe; 102. Branch pipe; 103. Explosion head cover; 104. Ignition electrode; 105. Ignition controller; 106. Dust spray interface; 107. First explosion tail cover; 108. Second explosion tail cover; 109. First glass window; 110. Second glass window; 111. First pressure sensor; 112. Second pressure sensor; 113. Adapter; 1131. 0° adapter; 1132. 30° adapter; 1133. 45° adapter; 2. Air supply assembly; 201. Gas cylinder; 2 02. Flow control valve; 203. Inlet control valve; 204. Shut-off valve; 3. Dust spray assembly; 301. Dust storage control start valve; 302. Dust storage tank; 303. Third pressure sensor; 304. Inflation control valve; 305. Flow regulating valve; 306. Compressed gas cylinder; 4. Product collection assembly; 401. Shut-off control valve; 402. Gas intake control valve; 403. Dust collector; 404. Airbag; 405. Vacuum control valve; 406. Vacuum pump; 5. Data acquisition and control assembly; 501. Data acquisition unit; 502. Computer. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-4 The present invention will be described in further detail below.

[0032] Please refer to the attached diagram in the instruction manual. Figure 1 The present invention provides an embodiment of an improved shock wave dust secondary explosion experimental device, comprising an explosion ignition component 1 and a data acquisition and control component 5. A product collection component 4 is provided on the top of the explosion ignition component 1, and a dust spray component 3 and an air supply component 2 are respectively provided on one side of the explosion ignition component 1.

[0033] Please refer to the attached diagram in the instruction manual. Figure 1 The explosion ignition assembly 1 includes a main pipe 101, with a branch pipe 102 connected to the bottom of the main pipe 101 via a flange. First glass windows 109 are installed on both the front and rear sides of the main pipe 101, and second glass windows 110 are installed on both the front and rear sides of the branch pipe 102. The coordinated arrangement of the first glass windows 109 and the second glass windows 110 facilitates the recording of flames inside the main pipe 101 and branch pipe 102 using a high-speed camera, and is also used for schlieren recording of the explosion shock wave.

[0034] Please refer to the attached diagram in the instruction manual. Figure 1The data acquisition and control component 5 includes a data acquisition unit 501 and a computer 502. Several first pressure sensors 111 are connected to the inner wall of the main pipe 101, and several second pressure sensors 112 are connected to the inner wall of the branch pipe 102. The output terminals of the first pressure sensors 111 and the second pressure sensors 112 are electrically connected to the input terminal of the data acquisition unit 501, and the output terminal of the data acquisition unit 501 is electrically connected to the input terminal of the computer 502. The pressure inside the main pipe 101 is detected by the first pressure sensors 111, and the pressure inside the branch pipe 102 is detected by the second pressure sensors 112. The pressure values ​​are transmitted to the computer 502 via the data acquisition unit 501, and personnel can read the readings of the first pressure sensors 111 and the second pressure sensors 112 via the computer 502.

[0035] Please refer to the attached diagram in the instruction manual. Figure 1 The air supply assembly 2 includes two gas cylinders 201. A flow control valve 202, an intake control valve 203, and a shut-off valve 204 are sequentially connected to the top of each gas cylinder 201. The output of the computer 502 is electrically connected to the inputs of the flow control valve 202, the intake control valve 203, and the shut-off valve 204, respectively. Combustible gas and air are stored in the two gas cylinders 201, respectively. By opening the flow control valve 202, the intake control valve 203, and the shut-off valve 204, the mixed gas can be injected into the main pipe 101.

[0036] Please refer to the attached diagram in the instruction manual. Figure 1 The dust spraying assembly 3 includes a dust storage control start valve 301. A dust storage tank 302 is connected to the end of the dust storage control start valve 301 furthest from the branch pipe 102. A third pressure sensor 303 is installed on the dust storage tank 302. An inflation control valve 304, a flow regulating valve 305, and a compressed air cylinder 306 are sequentially connected to the end of the dust storage tank 302 furthest from the dust storage control start valve 301. The output terminal of the computer 502 is electrically connected to the input terminals of the dust storage control start valve 301, the inflation control valve 304, and the flow regulating valve 305, respectively. The output terminal of the third pressure sensor 303 is electrically connected to the input terminal of the data acquisition unit 501. The inflation control valve 304 and the flow regulating valve 305 are opened to pressurize the dust storage tank 302. When the reading on the third pressure sensor 303 reaches a predetermined value, the inflation control valve 304 and the flow regulating valve 305 are closed, initiating a dust spraying action on the branch pipe 102.

[0037] Please refer to the attached diagram in the instruction manual. Figure 1The product collection assembly 4 includes a closed control valve 401. On the side of the closed control valve 401 away from the main pipe 101, a gas intake control valve 402 and a vacuum control valve 405 are connected respectively. On the end of the gas intake control valve 402 away from the closed control valve 401, a dust collector 403 and an air bag 404 are connected in sequence. On the end of the vacuum control valve 405 away from the closed control valve 401, a vacuum pump 406 is connected. The output terminal of the computer 502 is electrically connected to the input terminals of the closed control valve 401, the gas intake control valve 402, the dust collector 403, the vacuum control valve 405, and the vacuum pump 406 respectively. After the explosion, the closed control valve 401, the gas intake control valve 402, and the dust collector 403 are opened to collect the gas into the airbag 404. After the gas is completely pumped out, the closed control valve 401, the gas intake control valve 402, and the dust collector 403 are closed. The powder storage box inside the dust collector 403 is then removed to facilitate the detection and analysis of the gas in the airbag 404 and the powder in the powder storage box, thereby achieving effective collection of the explosion products in the pipeline.

[0038] Please refer to the attached diagram in the instruction manual. Figure 1 , Figure 2 , Figure 3 and Figure 4 An adapter 113 is provided at the connection between the main pipe 101 and the branch pipe 102. The adapter 113 includes a 0° adapter 1131, a 30° adapter 1132, and a 45° adapter 1133. An explosive cap 103 is installed on the right side of the main pipe 101. An ignition electrode 104 is connected to the side of the explosive cap 103 closest to the center of the main pipe 101. An ignition controller 105 is provided at the end of the explosive cap 103 away from the ignition electrode 104. A first explosive tail cap 107 is installed on the left side of the main pipe 101. A dust spray port 106 is provided at the bottom of the main pipe 101 near the first explosive tail cap 107. This allows the dust spray assembly 3 to move to the preset dust spray port 106 on the main pipe 101 to spray dust onto the main pipe 101. A second explosive tail cap 108 is installed at the bottom of the branch pipe 102.

[0039] Working principle: In use, first open the explosion cover 103 and check that the inside of the main pipe 101 is clean and free of residue. Then, tighten the explosion cover 103. There is a flange connection between the main pipe 101 and the ignition electrode 104 for installing the explosion-proof diaphragm. After installing the explosion-proof diaphragm, spread a measured amount of combustible dust on the main pipe 101. Control computer 502 closes all valves, unscrews the dust storage tank 302, adds an appropriate amount of powder, and tightens the dust storage tank 302. Control computer 502 opens the sealing control valve 401, the vacuum control valve 405, and the vacuum pump 406 to extract air from the main pipe 101 and release it to the atmosphere. After extraction, close the sealing control valve 401, the vacuum control valve 405, and the vacuum pump 406. Then, control computer 502 opens the flow control valve 202, the inlet control valve 203, and the sealing valve 204, allowing air to flow through the two gas cylinders 201 to... A certain concentration of premixed gas is introduced into the main pipe 101. Then, the flow control valve 202, the air intake control valve 203, and the closing valve 204 are closed. Then, the inflation control valve 304 and the flow regulating valve 305 are opened to pressurize the dust storage tank 302. When the reading on the third pressure sensor 303 reaches the predetermined value, the inflation control valve 304 and the flow regulating valve 305 are closed. The control computer 502 sets the ignition delay time of the ignition controller 105 and automatically ignites. After the explosion is completed, the closing control valve 401, the gas intake control valve 402, and the dust collector 403 are opened to collect the gas into the airbag 404. After the gas is completely evacuated, the closing control valve 401, the gas intake control valve 402, and the dust collector 403 are closed. The powder storage box in the dust collector 403 is taken out. The gas in the airbag 404 and the powder in the powder storage box are tested and analyzed. The experiment ends.

[0040] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. An improved shock wave dust secondary explosion experimental device, comprising an explosion ignition assembly (1) and a data acquisition and control assembly (5), characterized in that: The top of the explosion ignition assembly (1) is provided with a product collection assembly (4), and a dust spray assembly (3) and an air supply assembly (2) are respectively provided on one side of the explosion ignition assembly (1). The explosion ignition assembly (1) includes a main pipe (101), and a branch pipe (102) is connected to the bottom of the main pipe (101) via a flange. An adapter (113) is provided at the connection between the main pipe (101) and the branch pipe (102). The adapter (113) includes a 0° adapter (1131), a 30° adapter (1132), and a 45° adapter (1133). An explosion head cover (103) is installed on the right side of the main pipe (101). An ignition electrode (104) is connected to the side of the explosion head cover (103) near the center of the main pipe (101). An ignition controller (105) is provided at the end of the explosion head cover (103) away from the ignition electrode (104). A first explosion tail cover (107) is installed on the left side of the main pipe (101), and a second explosion tail cover (108) is installed at the bottom of the branch pipe (102).

2. The improved shock wave dust secondary explosion experimental device according to claim 1, characterized in that: The bottom of the main tube (101) is provided with a dust spray port (106) near the first explosion tail cap (107).

3. The improved shock wave dust secondary explosion experimental device according to claim 1, characterized in that: The main pipe (101) is equipped with a first glass window (109) on both the front and rear sides, and the branch pipe (102) is equipped with a second glass window (110) on both the front and rear sides.

4. The improved shock wave dust secondary explosion experimental device according to claim 1, characterized in that: The data acquisition and control component (5) includes a data acquisition unit (501) and a computer (502). A plurality of first pressure sensors (111) are connected to the inner wall of the main pipe (101), and a plurality of second pressure sensors (112) are connected to the inner wall of the branch pipe (102). The output ends of the first pressure sensors (111) and the second pressure sensors (112) are electrically connected to the input end of the data acquisition unit (501), and the output end of the data acquisition unit (501) is electrically connected to the input end of the computer (502).

5. The improved shock wave dust secondary explosion experimental device according to claim 4, characterized in that: The air supply assembly (2) includes two gas cylinders (201). The top of the two gas cylinders (201) is connected in sequence to a flow control valve (202), an air intake control valve (203), and a shut-off valve (204). The output end of the computer (502) is electrically connected to the input ends of the flow control valve (202), the air intake control valve (203), and the shut-off valve (204), respectively.

6. The improved shock wave dust secondary explosion experimental device according to claim 4, characterized in that: The dust spraying assembly (3) includes a dust storage control start valve (301). The end of the dust storage control start valve (301) away from the branch pipe (102) is connected to a dust storage tank (302). A third pressure sensor (303) is installed on the dust storage tank (302). The end of the dust storage tank (302) away from the dust storage control start valve (301) is connected in sequence to an inflation control valve (304), a flow regulating valve (305), and a compressed air cylinder (306). The output end of the computer (502) is electrically connected to the input ends of the dust storage control start valve (301), the inflation control valve (304), and the flow regulating valve (305), respectively. The output end of the third pressure sensor (303) is electrically connected to the input end of the data acquisition unit (501).

7. The improved shock wave dust secondary explosion experimental device according to claim 4, characterized in that: The product collection assembly (4) includes a closed control valve (401), on the side of the closed control valve (401) away from the main pipe (101) connected to a gas intake control valve (402) and a vacuum control valve (405) respectively. The end of the gas intake control valve (402) away from the closed control valve (401) is connected to a dust collector (403) and an air bag (404) in sequence. The end of the vacuum control valve (405) away from the closed control valve (401) is connected to a vacuum pump (406). The output end of the computer (502) is electrically connected to the input ends of the closed control valve (401), the gas intake control valve (402), the dust collector (403), the vacuum control valve (405), and the vacuum pump (406) respectively.

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