Spherical dust explosion demonstration device

Abstract

The utility model relates to a spherical dust explosion demonstration device which comprises a spherical shell, one side of the spherical shell is provided with an explosion venting port, the other side of the spherical shell is connected with an air inlet pipeline, and the upper side of one end, close to the spherical shell, of the air inlet pipeline is connected with a dust funnel; an electric spark ignition rod is arranged in the spherical shell, and a secondary explosion medium container is arranged at the top in the spherical shell. According to the spherical dust explosion demonstration device, the spherical shell is adopted, so that the demonstration device has the advantages of being small in explosion stress, light in weight and low in energy loss. The device is provided with a larger explosion venting port, the safety is high, the whole process from blowing of dust from the air inlet pipeline to filling of the spherical shell and dust explosion can be completely observed, and a secondary explosion experiment can be carried out by means of a secondary explosion medium container.

Description

Technical Field

[0001] The utility model relates to the field of experimental teaching equipment, in particular to a spherical dust explosion demonstration device. Background Art

[0002] At present, there are few practical experiments on dust explosion, and most of them are only explained through theoretical principles. The main reason is that the explosion process is risky and can easily endanger life safety; most dust explosion devices cannot achieve internal visualization of the explosion process; currently most explosion devices are square or elliptical, and there is no device that can demonstrate the secondary explosion phenomenon. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a spherical dust explosion demonstration device, which has high safety and can simulate the process of secondary explosion after the first explosion.

[0004] The utility model is implemented by the following scheme: a spherical dust explosion demonstration device, comprising a spherical shell, one side of the spherical shell is provided with an explosion relief port, the other side is connected to an air inlet duct, the upper side of the air inlet duct close to one end of the spherical shell is connected to a dust funnel; an electric spark ignition rod is arranged in the spherical shell, and a secondary explosion medium container is arranged on the top of the spherical shell.

[0005] Furthermore, a pressure gauge and a temperature gauge are provided on both sides of the top of the spherical shell.

[0006] Furthermore, a glass observation window is also provided on the spherical shell.

[0007] Furthermore, the secondary explosion medium container is welded to the top of the spherical shell, and a feed pipe that passes through the top of the spherical shell is connected to the upper side of the secondary explosion medium container. The upper end of the feed pipe is provided with an internal thread and is connected to a plug; the bottom of the secondary explosion medium container is a hollow structure, and the lower part of the secondary explosion medium container is provided with a film that seals its bottom.

[0008] Furthermore, the air inlet end of the air inlet duct is connected to the air outlet of a blower, and a one-way partition is provided inside the end of the air inlet duct close to the blower.

[0009] Furthermore, the explosion vent is sealed by a film.

[0010] Compared with the prior art, the utility model has the following beneficial effects: the utility model spherical dust explosion demonstration device adopts a spherical shell with the advantages of small explosion stress, light weight and low energy loss. The device is equipped with a large explosion vent, which is highly safe and can fully observe the whole process from dust blowing out from the air inlet duct to filling the spherical shell and dust explosion, and can use the secondary explosion medium container to conduct a secondary explosion experiment.

[0011] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through specific embodiments and related drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a cross-sectional view of the overall structure of an embodiment of the utility model;

[0013] Explanation of the numbers in the figure: 1-pressure gauge, 2-temperature gauge, 3-dust funnel, 4-air inlet duct, 5-blower, 6-electric spark ignition rod, 7-secondary explosion medium container, 8-film, 9-explosion vent, 10-one-way partition, 11-spherical shell. DETAILED DESCRIPTION

[0014] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0015] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0016] like Figure 1 As shown, a spherical dust explosion demonstration device includes a spherical shell 11, which is made of 304 stainless steel. An explosion vent 9 is provided on one side of the spherical shell 11, and an air inlet duct 4 is connected to the other side. The air inlet duct 4 is connected to a dust funnel 3 on the upper side near one end of the spherical shell 11; an electric spark ignition rod 6 is provided in the spherical shell 11, and a secondary explosion medium container 7 is provided at the top of the spherical shell 11, and the secondary explosion medium container 7 stores combustibles for secondary explosion. The demonstration device adopts a spherical shell structure, which has the advantages of smaller explosion stress, lighter weight and lower energy loss. In an explosion accident, the harm caused by the secondary explosion is often greater than the first explosion, with a wider range of damage and stronger power. Therefore, a demonstration device that can realize the secondary explosion is particularly important. The device is provided with a larger explosion vent 9, which is highly safe. The demonstration device can complete the explosion experiment, and can also simulate the experiment that after the first explosion, the container ruptures and causes the stored combustibles to leak, thereby causing a secondary explosion.

[0017] In this embodiment, a pressure gauge 1 and a temperature gauge 2 are provided on both sides of the top of the spherical shell 11 .

[0018] In this embodiment, a glass observation window (not shown in the figure) is also provided on the spherical shell, and the internal explosion process can be observed through the glass observation window.

[0019] In this embodiment, the secondary explosion medium container 7 is welded to the top of the spherical shell, and a feed pipe that passes through the top of the spherical shell is connected to the upper side of the secondary explosion medium container. The upper end of the feed pipe is provided with an internal thread and is connected to a plug. The plug is provided with an external thread. The plug is directly screwed on the upper end of the feed pipe to prevent the explosion from spraying out from the feed pipe; the bottom of the secondary explosion medium container is a hollow structure, and the lower part of the secondary explosion medium container is provided with a film 8 that seals its bottom.

[0020] Multiple explosions are the characteristics that distinguish dust explosions from other explosions. The main difference between a primary explosion and a secondary explosion is that the dust from a primary explosion is already suspended in the air before the explosion, while the dust from a secondary explosion is deposited on the surface of an object and is blown up to form a dust cloud under the action of external factors. This experimental device can complete the explosion experiment, and can also simulate the experiment that after a primary explosion occurs, the container ruptures, causing the stored combustibles to leak, thereby causing a secondary explosion. One of the important designs that supports the secondary explosion test is the secondary explosion medium container 7, which is a hollow-bottomed cylinder with a diameter of 37.5 mm and a height of 32 mm. In order to prevent the explosion from damaging the container, the container is also made of 304 stainless steel. After the explosion experiment is completed, the container is re-sealed with a film, and the combustibles to be stored in the secondary explosion medium container are transported to the container through the feed pipe above the spherical shell, so as to facilitate the next experiment. The mechanism of simulating a secondary explosion is that during the explosion process, the pressure generated by the first explosion destroys the film outside the container, causing the film to rupture, and the combustibles in the container leak, and a secondary explosion occurs with the help of an ignition source. The container is designed to be installed on the top of the spherical shell. Its purpose is to distribute the leakage as evenly as possible in the spherical shell, so that the secondary explosion experiment can proceed more smoothly.

[0021] In this embodiment, the air inlet end of the air inlet duct 4 is connected to the air outlet of a blower 5, and a one-way partition 10 is provided inside the air inlet duct 4 at one end close to the blower. The one-way partition 10 acts as a one-way valve, and the upper part of the one-way partition is hinged to the top of the air inlet duct 4. The one-way partition 10 opens when the blower is started and automatically closes when the blower is turned off.

[0022] In this embodiment, the explosion vent is sealed by a film 8 .

[0023] The blower 5 passes the dust into the device to make the dust distribution more uniform. The diameter of the explosion vent 9 is set to 200mm, so that the pressure of the explosion can be released to the outside in a relatively safe time, reducing damage to the device and improving safety performance. In order to allow the dust to explode in a closed environment, a film needs to be put on the explosion vent 9. In order to facilitate the film on the spherical shell, a circular sleeve extending outward is welded at the explosion vent 9. The width of the circular sleeve is 35mm, and the film is wrapped on the circular sleeve. The one-way partition 10 is placed in the air inlet duct 4. The one-way partition 10 opens when the blower is started and automatically closes when the blower is turned off, which can prevent the explosion wave from bringing the remaining dust in the air inlet duct 4 into the blower 5.

[0024] Secondary explosion process: Dust is loaded into the air inlet duct 4 and the secondary explosion medium container 7, the blower 5 is turned on to blow the dust into the spherical shell, the electric spark ignition rod 6 switch is turned on, and the first explosion occurs. The pressure generated by the first explosion destroys the film at the bottom of the secondary explosion medium container 7, causing the film to rupture and the combustibles in the container to leak. A secondary explosion occurs with the help of an ignition source, and the entire explosion process is photographed with a camera to record the pressure and temperature changes.

[0025] The demonstration device uses a spherical shell with the advantages of small explosion stress, light weight and low energy loss. The device is equipped with a large explosion vent 9, which is highly safe. It can fully observe the whole process from the dust blowing out of the air inlet duct 4 to filling the spherical shell and the dust explosion. With the help of the secondary explosion medium container 7, the pressure generated by the first explosion destroys the membrane of the container box, causing the membrane to rupture, the combustibles in the box to leak, and a secondary explosion occurs with the help of an ignition source. More experiments can be expanded, including changing the dust concentration and type, exploring the relationship between the parameters of the secondary explosion and the primary explosion, and changing the conditions of the spherical container to simulate the situation of dust explosion in different environments.

[0026] Unless otherwise stated, any technical solution disclosed in the above utility model, if it discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Any technician in the field should understand that the preferred numerical range is only a numerical value with a more obvious technical effect or representative value among many feasible numerical values. Since there are too many numerical values ​​to be exhaustive, the utility model discloses only some numerical values ​​to illustrate the technical solution of the utility model, and the numerical values ​​listed above should not constitute a limitation on the scope of protection of the utility model.

[0027] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except when it is obviously impossible to use an one-piece molding process).

[0028] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the above utility model include states or shapes that are approximate, similar or close thereto.

[0029] Any component provided by the utility model can be assembled from multiple separate components, or can be a separate component manufactured by an integrated molding process.

[0030] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A spherical dust explosion demonstration device, characterized in that: It comprises a spherical shell, one side of which is provided with an explosion vent and the other side is connected with an air inlet duct, the upper side of the air inlet duct close to one end of the spherical shell is connected with a dust funnel; an electric spark ignition rod is arranged in the spherical shell, and a secondary explosion medium container is arranged at the top of the spherical shell; the secondary explosion medium container is welded to the top of the spherical shell, a feed pipe which passes through the top of the spherical shell is connected to the upper side of the secondary explosion medium container, the upper end of the feed pipe is provided with an internal thread and is connected with a plug; the bottom of the secondary explosion medium container is a hollow structure, and the lower part of the secondary explosion medium container is provided with a film which seals the bottom thereof.

2. The spherical dust explosion demonstration device according to claim 1, characterized in that: A pressure gauge and a temperature gauge are arranged on both sides of the top of the spherical shell.

3. The spherical dust explosion demonstration device according to claim 1, characterized in that: The spherical shell is also provided with a glass observation window.

4. The spherical dust explosion demonstration device according to claim 1, characterized in that: The air inlet end of the air inlet duct is connected to the air outlet of a blower, and a one-way partition is arranged inside one end of the air inlet duct close to the blower.

5. The spherical dust explosion demonstration device according to claim 1, characterized in that: The explosion vent is sealed by a film.

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