Explosion-proof shell and mining explosion-proof transformer

Abstract

The utility model relates to the technical field of flame-proof shells, and particularly discloses a flame-proof shell and a mining flame-proof transformer, in the technical scheme, a gas storage bottle is fixedly arranged outside a shell, liquid flame-retardant gas is stored in the gas storage bottle, and when the interior of flame-proof electrical equipment explodes, the flame-retardant gas is stored in the gas storage bottle, so that the flame-retardant gas is stored in the flame-proof shell. And the liquid flame-retardant gas in the gas storage bottle is released into the explosion-proof shell in time, and the interior of the explosion-proof shell is rapidly cooled through a phase change heat absorption principle, so that the damage degree of components of the electrical equipment main body is reduced. According to the explosion-proof shell, the liquid flame-retardant gas is adopted to achieve the purposes of cooling and flame retardance, solid attachments cannot be generated in the explosion-proof electrical equipment, and convenient conditions are provided for follow-up repair and maintenance of an electrical equipment main body. The explosion-proof shell is scientific and reasonable in structural design, timely in release response speed of liquid flame-retardant gas when explosion occurs, stable in performance, long in service life and low in use cost, no newly-added explosion-proof combination surface exists in the implementation process, and the explosion loss risk cannot be increased.

Description

Technical Field

[0001] The utility model relates to an explosion-proof enclosure, in particular to an explosion-proof enclosure suitable for explosion-proof electrical equipment. Background Art

[0002] Explosion-proof electrical equipment such as mine explosion-proof transformers mainly consists of an explosion-proof enclosure and the main body of the electrical equipment. The explosion-proof enclosure is made of thick steel plates welded together, which can withstand a large explosion impact without deformation. Strict requirements are imposed on the parameters of the explosion-proof joint surface to prevent the flame, gas or hot substances generated by the internal explosion from spreading to the outside, thereby achieving good explosion-proof performance and being widely used in explosion-prone places such as coal mines. Currently, based on its structural design features, the explosion-proof enclosure enables the explosion-proof electrical equipment to have good explosion-proof performance. However, this design feature also causes the heat generated after the explosion inside the explosion-proof electrical equipment to not dissipate in time, and the main body of the electrical equipment remains in a high-temperature environment for a long time, increasing the degree of damage to the components, being not conducive to subsequent maintenance, and often resulting in scrapping, causing relatively large economic losses. Summary of the Utility Model

[0003] To overcome the problems of the prior art, the utility model provides an explosion-proof enclosure suitable for explosion-proof electrical equipment. A gas storage cylinder is fixedly installed outside the shell, and a liquid flame-retardant gas is stored in the gas storage cylinder. When an explosion occurs inside the explosion-proof electrical equipment, the liquid flame-retardant gas in the gas storage cylinder is released into the explosion-proof enclosure in time, and the explosion-proof enclosure is quickly cooled through the principle of endothermic phase change, thereby reducing the degree of damage to the components of the main body of the electrical equipment.

[0004] The task of the utility model also lies in overcoming the problem of how to connect the gas storage cylinder with the inside of the shell, aiming to ensure that when an explosion occurs inside the shell, the liquid flame-retardant gas inside the gas storage cylinder can be quickly and timely released into the shell.

[0005] Meanwhile, the utility model also provides a mine explosion-proof transformer made based on the explosion-proof enclosure.

[0006] To achieve the above technical objectives, the utility model adopts the following specific technical solutions:

[0007] An explosion-proof enclosure, comprising a housing, characterized in that: at least one mounting seat is installed on the housing, and a gas storage cylinder is installed on the mounting seat; the mounting seat includes an inner sleeve and an outer sleeve which are distributed inside and outside and fixedly connected, the outer sleeve is fixedly connected to the housing, an annular cavity is formed between the inner sleeve and the outer sleeve, and an annular piston in sliding seal fit is arranged in the annular cavity; one end of the annular cavity communicates with the inner cavity of the housing, the other end communicates with the outside and the annular piston cannot slide out from this end; the gas storage cylinder stores a liquid flame-retardant gas, the gas storage cylinder is fixedly connected with an air outlet valve, the air outlet end of the air outlet valve is fixedly connected with the inner sleeve in a sealed manner and communicates with the inner cavity of the housing through the inner sleeve, and a valve plate capable of sliding to adjust the opening and closing state of the air outlet valve and a spring for driving the valve plate to reset to the closed state are arranged in the air outlet valve; the annular piston is fixedly provided with a first ejector rod through a synchronizing frame, and when the annular piston moves towards the end of the annular cavity communicating with the outside, the first ejector rod can drive the valve plate to move to make the air outlet valve reach the open state.

[0008] A mine-used explosion-proof transformer, comprising a housing and a transformer body fixed inside the housing, characterized in that the housing is the explosion-proof enclosure provided by this application; there are two mounting seats, both of which are fixed at the upper end of the housing, and the gas storage cylinders are placed horizontally.

[0009] Compared with the prior art, the explosion-proof enclosure has the following beneficial technical effects:

[0010] This explosion-proof enclosure is used in explosion-proof electrical equipment. When an explosion occurs inside the explosion-proof electrical equipment, the pressure inside the explosion-proof enclosure suddenly increases. The annular piston is driven by the air pressure and moves in the annular cavity towards the end communicating with the outside. The first ejector rod moves synchronously with the annular piston. Under the pushing action of the first ejector rod, the valve plate will overcome the spring force and move to open the air outlet valve. After that, the liquid flame-retardant gas in the gas storage cylinder will enter the inner cavity of the explosion-proof enclosure through the air outlet valve and the inner sleeve. The liquid flame-retardant gas absorbs a large amount of heat during the gasification process, efficiently cools the inside of the explosion-proof electrical equipment, and based on its flame-retardant characteristics, prompts the open flame to go out, preventing the continuation of combustion and effectively reducing the damage degree of the components of the main body of the electrical equipment. This explosion-proof enclosure uses liquid flame-retardant gas to achieve the purposes of cooling and flame retardance. The gasified flame-retardant gas finally dissipates to the outside through the explosion-proof joint surface and will not generate solid attachments inside the explosion-proof electrical equipment, providing convenient conditions for the subsequent maintenance of the main body of the electrical equipment. The structural design of the mounting seat and the gas storage cylinder in this explosion-proof enclosure is scientific and reasonable. When an explosion occurs, the release response speed of the liquid flame-retardant gas is timely, which has a good inhibitory effect on the destructiveness of the explosion and improves the working safety of the explosion-proof electrical equipment. This explosion-proof enclosure adopts a mechanical triggering method, with stable performance and a long service life. During actual use, the annular piston can be reset, and the gas storage cylinder can be replaced in a timely manner, enabling this explosion-proof enclosure to work continuously and be recycled, reducing the use cost. Although this explosion-proof enclosure is additionally provided with a mounting seat and a gas storage cylinder, the joints of these newly added components all adopt a sealed connection method, and there is no new explosion-proof joint surface, so the explosion-proof risk of the explosion-proof enclosure will not be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present invention and do not limit the present invention.

[0012] Figure 1 FIG. 9 is a schematic structural diagram of the explosion-proof enclosure in Embodiment 1.

[0013] Figure 2 FIG. 13 is an exploded schematic diagram of the components of the explosion-proof enclosure in Embodiment 1.

[0014] Figure 3 FIG. 17 is a schematic structural diagram of the mounting seat in Embodiment 1.

[0015] Figure 4 FIG. 21 is a schematic structural diagram of the mounting seat in another direction in Embodiment 1.

[0016] Figure 5 FIG. 25 is a schematic structural diagram of the gas storage cylinder and the air outlet valve in Embodiment 1.

[0017] Figure 6Schematic diagram of the cooperation between the placement seat and the air outlet valve in the normal state in Embodiment 1.

[0018] Figure 7 Schematic diagram of the cooperation between the placement seat and the air outlet valve when an explosion occurs inside the housing in Embodiment 1.

[0019] Figure 8 Schematic diagram of the structure of the mine flameproof transformer in Embodiment 2.

[0020] In the figure:

[0021] 1. Housing;

[0022] 2. Placement seat, 21. Outer sleeve, 22. Connection part, 23. Annular cavity, 24. Annular piston, 25. First ejector rod, 26. Inner sleeve, 27. Synchronization frame;

[0023] 3. Air outlet valve, 31. Air outlet end, 32. Valve plate, 33. Spring, 34. Second ejector rod, 35. Inflation nozzle socket;

[0024] 4. Gas storage cylinder;

[0025] 5. Transformer main body. Detailed implementation manners

[0026] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0027] Unless otherwise defined, the technical terms or scientific terms used in the present utility model shall have the ordinary meanings understood by those of ordinary skill in the art to which the present utility model belongs. The terms "first", "second" and similar terms used in the present utility model do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms "connected" or "coupled" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0028] Embodiment 1

[0029] See Figure 1 、 Figure 2 As shown, this embodiment discloses an explosion-proof enclosure, which is applicable to explosion-proof electrical equipment and includes a housing 1 for accommodating the main body of the electrical equipment. Generally speaking, the housing 1 is usually composed of at least two parts fixedly connected so that the main body of the electrical equipment can be placed therein; at least one mounting seat 2 is installed on the housing 1, and an air storage cylinder 4 is installed outside the housing 1 through the mounting seat 2;

[0030] See Figure 1 、 Figure 3 、 Figure 4 As shown, the mounting seat 2 is composed of an inner sleeve 26, an outer sleeve 21 and an annular piston 24; the outer sleeve 21 is fixedly connected to the housing 1 based on current methods such as threaded fit and welding. The inner sleeve 26 is located inside the outer sleeve 21 and the two are fixedly connected. An annular columnar annular cavity 23 is formed between the inner sleeve 26 and the outer sleeve 21. The annular piston 24 is located in the annular cavity 23 and the two are slidably and sealingly matched; one end of the annular cavity 23 communicates with the inner cavity of the housing 1, and the other end communicates with the outside and the annular piston 24 cannot slide out from this end;

[0031] See Figure 1 、 Figure 5 、 Figure 6 As shown, the air storage cylinder 4 stores a flame-retardant gas in a liquid state. The flame-retardant gas can be a single gas or a mixed gas among gases such as carbon dioxide, nitrogen, and inert gases. A gas outlet valve 3 for releasing the flame-retardant gas is fixed outside the air storage cylinder 4; the gas outlet end 31 of the gas outlet valve 3 is fixedly and sealingly connected to the inner sleeve 26. At the same time, the gas outlet end 31 of the gas outlet valve 3 communicates with the inner cavity of the housing 1 through the inner sleeve 26; the gas outlet valve 3 is a normally closed switch valve commonly used in the prior art. Specifically, a valve plate 32 that can slide to adjust the opening and closing state of the gas outlet valve 3 and a spring 33 that drives the valve plate 32 to reset to the closed state are provided in the gas outlet valve 3;

[0032] See Figure 4 、 Figure 6 As shown, a synchronous frame 27 that moves synchronously with it is fixed on the annular piston 24, and a first ejector rod 25 is fixed on the synchronous frame 27. The first ejector rod 25 is kept facing the valve plate 32 of the gas outlet valve 3;

[0033] As Figure 7As shown, when the annular piston 24 moves towards the end where the annular cavity 23 communicates with the outside, the annular piston 24 will drive the first ejector rod 25 to move synchronously through the synchronous frame 27. At this time, the first ejector rod 25 will push the valve plate 32 to move against the elastic force of the spring 33, prompting the air outlet valve 3 to reach the open state. After that, the flame-retardant gas in the gas storage cylinder 4 will enter the inside of the housing 1 through the air outlet valve 3 and the inner sleeve 26.

[0034] The usage method and working principle of this flameproof enclosure are as follows:

[0035] As Figure 6 shown, this flameproof enclosure is used in explosion-proof electrical equipment. During the normal operation of the explosion-proof electrical equipment, the air outlet valve 3 will not be driven by external force and remains in the normally closed state, that is, the gas storage cylinder 4 will not release the flame-retardant gas.

[0036] As Figure 7 shown, when an explosion occurs inside the explosion-proof electrical equipment, the flameproof enclosure uses its own explosion-proof performance to prevent the flame, gas or hot substances generated by the explosion from spreading to the outside. At the same time, the pressure inside the flameproof enclosure increases suddenly with the explosion. The annular piston 24 is driven by the air pressure to move towards the end communicating with the outside in the annular cavity 23. The synchronous frame 27 drives the first ejector rod 25 to move synchronously with the annular piston 24. Under the pushing action of the first ejector rod 25, the valve plate 32 will move against the elastic force of the spring 33, thereby making the air outlet valve 3 reach the open state. After that, the liquid flame-retardant gas in the gas storage cylinder 4 will be released into the inner cavity of the flameproof enclosure through the air outlet valve 3 and the inner sleeve 26. The liquid flame-retardant gas absorbs a large amount of heat during the gasification process, efficiently cools the inside of the explosion-proof electrical equipment, and based on its flame-retardant characteristics, prompts the open fire to go out, preventing the continuation of combustion, thereby effectively reducing the damage degree of the components of the main body of the electrical equipment.

[0037] This flameproof enclosure uses a liquid flame-retardant gas to achieve the purposes of cooling and flame retardancy. After the flame-retardant gas is gasified, it is finally dissipated to the outside through the explosion-proof joint surface, and no solid attachments or dirt will be generated inside the explosion-proof electrical equipment, providing convenient conditions for the subsequent maintenance of the main body of the electrical equipment.

[0038] The structural design of the mounting seat and the gas storage cylinder in this flameproof enclosure is scientific and reasonable. The release response speed of the liquid flame-retardant gas during an explosion is timely, which has a good inhibitory effect on the destructiveness of the explosion and improves the working safety of the explosion-proof electrical equipment. This flameproof enclosure adopts a mechanical triggering method, with stable performance, long service life and high reliability.

[0039] During the actual use of this flameproof enclosure, the annular piston can be reset, and the gas storage cylinder can be replaced in a timely manner, enabling this flameproof enclosure to work continuously, be recycled, and reduce the use cost.

[0040] As Figure 1As shown, although the explosion-proof enclosure is provided with new components such as the mounting seat 2 and the gas storage cylinder 4, the joints of these new components are all in a sealed connection fit, and there is no new explosion-proof joint surface. Therefore, the explosion-proof risk of this explosion-proof enclosure will not increase compared with previous similar products.

[0041] In the explosion-proof enclosure described above, the number and distribution positions of the mounting seat and the gas storage cylinder should be reasonably set in combination with the volume, size, etc. of the shell body, aiming to ensure that the interior of the shell body can be substantially cooled after the gas storage cylinder releases the flame retardant gas.

[0042] See Figure 3 As shown, in the explosion-proof enclosure described above, the inner sleeve 26 and the outer sleeve 21 are fixedly connected. Preferably, a connecting part 22 for fixedly connecting the inner sleeve 26 and the outer sleeve 21 is provided at one end where the annular cavity 23 communicates with the outside. This can ensure that the mounting seat 2 is more compact, reducing the occupation of the internal space of the shell body. At the same time, the connecting part 22 can provide a limiting function for the annular piston 24 to prevent the annular piston 24 from moving out of the end where the annular cavity 23 communicates with the outside.

[0043] See Figure 2 、 Figure 3 、 Figure 5 As shown, in the explosion-proof enclosure described above, the gas outlet end 31 of the gas outlet valve 3 and the inner sleeve 26 are preferably fixedly connected by a threaded fit. This enables the gas storage cylinder 4 and the gas outlet valve 3 to be disassembled and assembled, so as to detect the internal pressure of the gas storage cylinder 4. When the pressure is insufficient, it can be conveniently replaced. Further, an inflation nozzle socket 35 is provided at the gas outlet end 31 of the gas outlet valve 3, and a second ejector rod 34 extending into the inflation nozzle socket 35 is fixed on the valve plate 32. Thus, with the help of existing inflation facilities, flame retardant gas can be replenished into the gas storage cylinder 4. In specific implementation, the second ejector rod 34 should be arranged at the center of the valve plate 32 to ensure cooperation with existing inflation facilities, and the first ejector rod 25 can be aligned with the second ejector rod 34. When the annular piston 24 moves, the first ejector rod 25 drives the valve plate 32 to move by abutting against the second ejector rod 34. At the same time, the first ejector rod 25 can also be misaligned with the second ejector rod 34. When the annular piston 24 moves, the first ejector rod 25 directly abuts against the valve plate 32 to drive the valve plate 32 to move.

[0044] As Figure 4 As shown, in the explosion-proof enclosure described above, the synchronizing frame 27 is in an arc shape and is fixedly connected to two symmetric positions of the annular piston 24 at both ends, thereby ensuring the structural stability of the synchronizing frame 27 and the annular piston 24.

[0045] Embodiment 2

[0046] See Figure 8As shown in the figure, this embodiment discloses a mine flameproof transformer, which includes a housing and a transformer main body 5 fixed inside the housing. The feature is that the housing adopts the flameproof housing in Embodiment 1. There are two placement seats 2, both of which are fixed to the upper end of the housing 1, and the gas storage cylinder 4 is placed horizontally.

[0047] Since this mine flameproof transformer adopts the above-mentioned flameproof housing, it inherits the aforementioned technical effects of the flameproof housing. At the same time, the top of the flameproof housing of the mine flameproof transformer usually adopts an arched design. The placement seat 2 is fixed on the top of the flameproof housing, which can reasonably utilize the idle space inside the mine flameproof transformer without changing the main shape of the traditional flameproof housing. At the same time, installing the placement seat 2 on the top is also beneficial to improving the release effect of the liquid flame retardant gas.

[0048] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. An explosion-proof enclosure, comprising a housing, characterized in that: At least one mounting seat is installed on the housing, and a gas storage cylinder is installed on the mounting seat; the mounting seat includes an inner sleeve and an outer sleeve that are distributed inside and outside and fixedly connected, the outer sleeve is fixedly connected to the housing, an annular cavity is formed between the inner sleeve and the outer sleeve, and an annular piston that is in sliding seal fit is arranged in the annular cavity; one end of the annular cavity communicates with the inner cavity of the housing, the other end communicates with the outside, and the annular piston cannot slide out from this end; the gas storage cylinder stores liquid flame retardant gas, the gas storage cylinder is fixedly connected with an air outlet valve, the air outlet end of the air outlet valve is fixedly connected to the inner sleeve in a sealed manner and communicates with the inner cavity of the housing through the inner sleeve, and a valve plate that can slide to adjust the opening and closing state of the air outlet valve and a spring that drives the valve plate to reset to the closed state are arranged in the air outlet valve; the annular piston is fixedly provided with a first ejector rod through a synchronous frame, and when the annular piston moves towards the end of the annular cavity communicating with the outside, the first ejector rod can drive the valve plate to move so as to make the air outlet valve reach the open state.

2. The flameproof enclosure according to claim 1, characterized in that: The outer sleeve and the housing are fixedly connected based on a threaded fit or a welding method.

3. The flameproof enclosure according to claim 1, characterized in that: A connecting portion for fixedly connecting the inner sleeve and the outer sleeve is arranged at the end of the annular cavity communicating with the outside.

4. The flameproof enclosure according to claim 1, characterized in that: The air outlet end of the air outlet valve is fixedly connected to the inner sleeve by a threaded fit.

5. The flameproof enclosure according to claim 1, characterized in that: An inflation nozzle socket is arranged at the air outlet end of the air outlet valve, and a second ejector rod extending into the inflation nozzle socket is fixed on the valve plate.

6. The flameproof enclosure according to claim 1, characterized in that: The synchronous frame is in an arc shape, and both ends are fixedly connected to two symmetric positions of the annular piston respectively.

7. An explosion-proof transformer for mine use, comprising a housing and a transformer body fixed inside the housing, characterized in that, The outer shell is an explosion-proof shell according to any one of claims 1-6, there are two mounting seats, both are fixed at the upper end of the housing, and the gas storage cylinders are placed horizontally.

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