Dust explosion demonstration device

Abstract

The utility model relates to a dust explosion demonstration device, which realizes the effect of vividly demonstrating the dust explosion process through the ingenious combination of a power supply module, a high-voltage generation module, an electric arc generation head, an explosion chamber and a powder bin. The whole structure is compact, operation is easy and convenient, the positions of all modules are effectively fixed through the arrangement of the arch-shaped frame and the bottom plate, and stable supporting is provided. The air channel and the air outlet are arranged in the arch-shaped frame, and the air source is combined, so that flammable dust in the powder bin is blown away, and the dust diffusion condition in an actual production place is simulated. The explosion chamber comprises a cylindrical base and a transparent tank body, and the special design enables the explosion demonstration effect to be more vivid, for example, the height of the cylindrical base is increased. A pressure relief channel and a pressure relief valve in the top plate are arranged to effectively prevent dust backflow caused by air pressure rise, so that the reliability of the experimental device is guaranteed. The whole design is innovative and ingenious, the device is suitable for teaching demonstration and other scenes, and real simulation of the dust explosion phenomenon is presented for students.

Description

Technical Field

[0001] The utility model belongs to the technical field of physical experiment teaching aids, and specifically relates to a dust explosion demonstration device. Background Art

[0002] Dust explosion is a very destructive phenomenon. It refers to the situation where when combustible dust is within the explosion limit and encounters a heat source, the flame spreads rapidly throughout the entire mixed dust space in a very short time, triggering a very fast chemical reaction. This process releases a large amount of heat energy, forming high temperature and high pressure, which rapidly converts the energy of the system into mechanical energy, light and heat radiation, causing serious damage.

[0003] Dust explosions usually occur in industrial production, involving the production and processing sites of aluminum powder, zinc powder, aluminum processing grinding powder, various plastic powders, intermediates of organic synthetic drugs, wheat flour, sugar, sawdust, dyes, bakelite ash, milk powder, tea powder, tobacco powder, coal dust, plant fiber dust, etc. In these scenes, combustible dust forms a mixture with air, which may cause serious explosions once it encounters an ignition source.

[0004] In junior high school physics experiment teaching, dust explosion principles and experiments are involved. However, due to the lack of special demonstration devices, schools are often unable to vividly demonstrate this phenomenon to students, resulting in students' abstract understanding of the concept during the learning process and difficulty in forming an intuitive impression. Therefore, an effective demonstration device is needed to vividly demonstrate the process of dust explosion so that students can more intuitively understand and remember this dangerous phenomenon. Utility Model Content

[0005] In order to solve the defects of the above-mentioned prior art, the utility model proposes a dust explosion demonstration device.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A dust explosion demonstration device comprises: a power supply module, a high voltage generating module, an arc generating head, an explosion chamber and a powder bin, wherein the output end of the power supply module is connected to the high voltage generating module for power supply, the arc generating head is located inside the explosion chamber and is electrically connected to the high voltage generating module, the powder bin is located inside the explosion chamber, the powder bin is used to contain combustible dust used for the test, a pipeline at the bottom of the powder bin is connected to an air source, and the combustible dust in the powder bin is blown upward into the explosion chamber by blowing, and the combustible dust forms a mixture with the air.

[0008] Preferably, the power module, high-voltage generating module and explosion chamber are all arranged on the bottom plate, an arch frame is arranged above the high-voltage generating module, the arch frame is composed of three templates, and its two ends are open, the high-voltage generating module is located inside the arch frame, the power module is located on one side of the arch frame, the high-voltage generating module and the power module are connected by a wire, the explosion chamber is fixed on the upper surface of the arch frame, and the powder bin is fixed inside the explosion chamber and fixedly connected to the arch frame.

[0009] Preferably, the arch frame includes a top plate and two side plates, an air duct is arranged inside the top plate, an air outlet connected to the air duct is arranged on the upper surface of the top plate, an air inlet connected to the air duct is opened on the side of the top plate, the air outlet is located at the bottom of the powder bin and connected to the inside of the powder bin, and the air inlet is connected to the air source through a pipeline.

[0010] Furthermore, the powder bin is shaped like a ping-pong ball with upper and lower horizontal cuts, upper and lower openings, and bulges around the middle.

[0011] Furthermore, the explosion chamber includes a cylindrical base fixedly connected to the top plate of the arch frame, the upper end of the cylindrical base is open, the interior is a cylindrical inner cavity, the bottom of the side wall and the top plate are fixedly connected by a connecting piece, and the top of the cylindrical base is matched with a transparent tank body, which is inverted on the cylindrical base.

[0012] Furthermore, the height of the cylindrical base is 10-15 cm.

[0013] Furthermore, the connecting member is a bent connecting plate, one end of which is fixedly connected to the top plate by a bolt assembly, and the other end of the connecting plate is fixedly connected to the side wall of the cylindrical base by a bolt assembly.

[0014] Preferably, a pressure relief channel is provided inside the top plate, one end of the pressure relief channel is connected to the internal chamber of the cylindrical base, and the other end is connected to the external atmosphere, and a pressure relief valve is provided at the end of the pressure relief channel connected to the atmosphere.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0016] 1) In the experiment, the dust is blown into the explosion chamber through the gas source, and then the high-voltage arc is generated by controlling the electromagnetic ignition system to ignite the dust in the explosion chamber to complete the dust explosion demonstration test. Compared with the traditional manual ignition, a controllable and precise ignition process can be achieved, providing a more reliable detonation source for the dust explosion demonstration, which greatly improves the reliability of the experimental device.

[0017] 2) The explosion chamber consists of a cylindrical base and a transparent tank body. Increasing the height of the cylindrical base helps to increase the distance that the gas pushes the transparent tank body, thereby increasing the sound and shock wave effect of the explosion.

[0018] 3) A pressure relief channel is set in the top plate, and a pressure relief valve is set in the pressure relief channel. By controlling the pressure relief valve, the internal gas can be relieved when the transparent tank is connected downward, avoiding dust from flowing back into the air intake system and causing blockage; the pressure relief valve adopts a gas ball valve structure, which can maintain good sealing and ensure the safety of the device during the test and the experimental effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be described by way of examples with reference to the accompanying drawings, in which:

[0020] Figure 1 It is a three-dimensional diagram of the dust explosion demonstration device in the utility model;

[0021] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the medium dust explosion demonstration device. DETAILED DESCRIPTION

[0022] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0023] This embodiment provides a dust explosion demonstration device, which aims to provide students with an intuitive and vivid experimental demonstration by simulating the explosion process of combustible dust under specific conditions, thereby deepening their understanding of the principle of dust explosion.

[0024] The following are the main technical features and effects of the device, see Figure 1 , 2 ,include:

[0025] The power module 1, the high voltage generating module 2, the arc generating head 3, the explosion chamber 4 and the powder bin 5, the power module 1 is the energy supply unit of the whole device. Its output end is connected to the high voltage generating module 2 for power supply, and a battery pack is usually used as a power source. For the convenience of control, a switch is provided on the power module 1, which is connected in series between the power module 1 and the high voltage generating module 2 to control the power on and off of the high voltage generating module 2. This design can ensure that the power supply can be quickly cut off when necessary, thereby improving the safety of operation.

[0026] The high voltage generating module 2 is a key component for generating high voltage electricity. It can be a high voltage package or a high voltage generator. The output end of the high voltage generating module 2 is connected to the arc generating head 3, and by providing sufficient voltage, the arc generating head 3 can generate a high voltage arc in the explosion chamber 4.

[0027] The arc generating head 3 includes at least one discharge electrode group, which is located in the explosion chamber 4. Each discharge electrode group is composed of a discharge positive electrode and a discharge negative electrode that discharge each other and are connected to the output end of the high-voltage generating module 2. The arc generating head 3 can generate a high-voltage arc through the power supply of the high-voltage generating module 2, providing an ignition source for the dust explosion. This design enables the arc generating head 3 to have a reliable ignition function.

[0028] The explosion chamber 4 is a container for conducting dust explosion demonstration. The powder bin 5 is located in the explosion chamber 4. The powder bin 5 is used to contain combustible dust 11 used in the test. The bottom pipe of the powder bin 5 is connected to an air source 10. The combustible dust 11 in the powder bin 5 is blown upward into the explosion chamber 4 by blowing. The combustible dust 11 forms a mixture with the air. This step simulates the diffusion of dust in an actual production site. At the same time, when the high-voltage generating module 2 is energized and the arc generating head 3 generates a high-voltage arc, the dust in the explosion chamber 4 can be ignited to complete the dust explosion demonstration test.

[0029] In this embodiment, the power module 1, the high-voltage generating module 2 and the explosion chamber 4 are all arranged on the bottom plate 6, an arch frame 7 is arranged above the high-voltage generating module 2, the arch frame 7 is composed of three templates, and its two ends are open, the high-voltage generating module 2 is located inside the arch frame 7, the power module 1 is located on one side of the arch frame 7, the high-voltage generating module 2 and the power module 1 are connected by a wire, the explosion chamber 4 is fixed on the upper surface of the arch frame 7, and the powder bin 5 is fixed inside the explosion chamber 4 and fixedly connected to the arch frame 7.

[0030] Furthermore, the arch frame 7 includes a top plate 701 and two side plates 702. An air duct 8 is arranged inside the top plate 701. An air outlet 9 connected to the air duct 8 is arranged on the upper surface of the top plate 701. An air inlet connected to the air duct 8 is opened on the side of the top plate 701. The air outlet 9 is located at the bottom of the powder bin 5 and is connected to the inside of the powder bin 5. The air inlet is connected to the air source 10 through a pipeline. The air source 10 can be an electric or manual air pump. Through the above, the air source 10 is connected and opened, and the air source 10 fills the powder bin 5 with pressurized gas through the pipeline. The gas blows the combustible dust 11 inside the powder bin 5 upward.

[0031] Furthermore, the powder bin 5 is shaped like a ping-pong ball with horizontal cutouts at the top and bottom, and is specifically shaped like an upper and lower opening, with protrusions around the middle, which can be arc-shaped or pyramid-shaped, as long as the combustible dust 11 inside the powder bin 5 is blown out once, the remaining dust can be gathered at the air outlet 9 at the bottom of the powder bin 5 under the action of gravity. For the material selection of the powder bin 5, high temperature resistant plastic or metal material is preferred, and the fixing method is preferably bonding to the upper surface of the top plate 701.

[0032] Furthermore, the explosion chamber 4 includes a cylindrical base 401 fixedly connected to the top plate 701 of the arch frame 7, the upper end of the cylindrical base 401 is open, the interior is a cylindrical inner cavity, the bottom of the side wall and the top plate 701 are fixedly connected by a connecting piece, and the top of the cylindrical base 401 is equipped with a transparent tank body 402, which is inverted on the cylindrical base 401. During the test, the dust encounters an electric arc inside the cylindrical base to produce an explosion, and the shock wave generated by the explosion pushes the transparent tank body upward.

[0033] Specifically, the transparent tank body 402 may be a plastic bottle, the lower opening size of which is consistent with the outer diameter of the cylindrical base 401, so that the cylindrical inner cavity inside the cylindrical base 401 can maintain a relatively sealed environment, which meets the test standard for dust explosion.

[0034] Specifically, the connecting member is a bent connecting plate 403 , one end of which is fixedly connected to the top plate 701 via a bolt assembly, and the other end of the connecting plate 403 is fixedly connected to the side wall of the cylindrical base 401 via a bolt assembly.

[0035] Furthermore, the height of the cylindrical base 401 is increased to 10-15 cm compared to the traditional structure, which can increase the distance that the gas pushes the transparent tank to work, so that the transparent tank can fly upward under the action of the explosion shock wave, increase the height and make the explosion sound louder, making the demonstration effect more vivid.

[0036] Furthermore, considering that the air pressure inside the cylindrical base 401 increases during the process of the transparent tank body being downwardly combined with the cylindrical base 401, the dust is easily pressed out from the gap. To avoid the above problem, a pressure relief channel 12 is arranged inside the top plate 701. One end of the pressure relief channel 12 is connected to the internal chamber of the cylindrical base, and the other end is connected to the external atmosphere. A pressure relief valve 13 is arranged at the end of the pressure relief channel 12 connected to the atmosphere. When in use, before the transparent tank body is buckled downwardly on the cylindrical base 401, the pressure relief valve 13 is opened. The pressure relief valve 13 is a gas ball valve, which connects the inside of the cylindrical base 401 with the external atmosphere. When the transparent tank body is connected to the cylindrical base 401, the pressure relief valve 13 is closed and the subsequent steps can be carried out.

[0037] Furthermore, the arc generating head 3 includes a group of discharge electrode groups, each of which is composed of a discharge positive electrode and a discharge negative electrode that cooperate with each other, and the positive electrode and the negative electrode are located at the upper opening of the powder bin 5.

[0038] Furthermore, in order to ensure the normal operation and safety of the power module, a housing is specially designed as a protective device. This housing is located outside the power module and has several heat dissipation holes on the top to achieve the following functions:

[0039] Protection: The main purpose of the housing is to provide physical protection for the power module to prevent damage to the power module from the external environment, touch or other factors. This helps to extend the service life of the power module and ensure its stability and reliability during the demonstration test.

[0040] Heat dissipation design: To prevent the power module from overheating during operation, several heat dissipation holes are opened on the top of the shell. These heat dissipation holes allow the surrounding air to circulate, causing heat to dissipate from the power module and effectively reduce the temperature. Good heat dissipation design helps maintain the power module within a suitable operating temperature range and improve its efficiency and performance.

[0041] It should be noted that the power module 1, high-voltage generating module 2 and arc generating head 3 used therein are standard parts, which can all be purchased from the market and can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the components known to technical personnel in this field, their structures and principles can be known to technical personnel through technical manuals or through conventional experimental methods.

[0042] As described above, the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A dust explosion demonstration device, characterized in that: include: A power supply module, a high-voltage generating module, an arc generating head, an explosion chamber and a powder bin. The output end of the power supply module is connected to the high-voltage generating module for power supply. The arc generating head is located inside the explosion chamber and is electrically connected to the high-voltage generating module. The powder bin is located inside the explosion chamber. The powder bin is used to contain combustible dust used in the test. The bottom pipe of the powder bin is connected to an air source. The combustible dust in the powder bin is blown upward into the explosion chamber by blowing, and the combustible dust forms a mixture with the air.

2. A dust explosion demonstration device according to claim 1, characterized in that: The power module, high-voltage generating module and explosion chamber are all arranged on the bottom plate. An arch frame is arranged above the high-voltage generating module. The arch frame is composed of three templates, and its two ends are open. The high-voltage generating module is located inside the arch frame, and the power module is located on one side of the arch frame. The high-voltage generating module and the power module are connected by a wire. The explosion chamber is fixed on the upper surface of the arch frame, and the powder bin is fixed inside the explosion chamber and fixedly connected to the arch frame.

3. A dust explosion demonstration device according to claim 2, characterized in that: The arch frame includes a top plate and two side plates. An air duct is arranged inside the top plate. An air outlet connected to the air duct is arranged on the upper surface of the top plate. An air inlet connected to the air duct is opened on the side of the top plate. The air outlet is located at the bottom of the powder bin and connected to the inside of the powder bin. The air inlet is connected to the air source through a pipeline.

4. A dust explosion demonstration device according to claim 2, characterized in that: The powder bin is shaped like a ping-pong ball with upper and lower horizontal cuts, upper and lower openings, and bulges around the middle.

5. A dust explosion demonstration device according to claim 4, characterized in that: The explosion chamber comprises a cylindrical base fixedly connected to the top plate of the arch frame, the upper end of the cylindrical base is open, the interior is a cylindrical inner cavity, the bottom of the side wall and the top plate are fixedly connected by a connecting piece, and the top of the cylindrical base is matched with a transparent tank body, which is inverted on the cylindrical base.

6. A dust explosion demonstration device according to claim 5, characterized in that: The height of the cylindrical base is 10-15 cm.

7. A dust explosion demonstration device according to claim 5, characterized in that: The connecting piece is a bent connecting plate, one end of which is fixedly connected to the top plate by a bolt assembly, and the other end of which is fixedly connected to the side wall of the cylindrical base by a bolt assembly.

8. A dust explosion demonstration device according to claim 1, characterized in that: A pressure relief channel is arranged inside the top plate, one end of the pressure relief channel is connected with the internal chamber of the cylinder base, and the other end is connected with the external atmosphere. A pressure relief valve is arranged at the end of the pressure relief channel connected with the atmosphere.

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