Explosion-proof alarm and alarm system

Abstract

The utility model relates to an explosion-proof alarm and an alarm system. The explosion-proof alarm comprises an explosion-proof cavity which comprises a first cover body, a second cover body, an explosion-proof gland and an explosion-proof threading plug, the first cover body and the second cover body are matched in a sealing mode, the explosion-proof gland is arranged on the first cover body, and the explosion-proof threading plug is arranged on the second cover body; the switching circuit board is arranged in the explosion-proof cavity; the alarm cavity is arranged outside the explosion-proof cavity and is connected to the second cover body; and the alarm circuit board is arranged in the alarm cavity and comprises a wire penetrating through the explosion-proof threading plug, and the alarm circuit board is electrically connected to the switching circuit board. The explosion-proof alarm is suitable for severe environments such as underground coal mines and the like.

Description

Technical Field

[0001] This application relates to the field of alarm equipment technology, and in particular to explosion-proof alarms and alarm systems. Background Technology

[0002] Alarm systems are required in industries such as steel metallurgy, telecommunications towers, hoisting machinery, construction machinery, ports and docks, transportation, wind power generation, and ocean-going vessels. Audible and visual alarms are an important component of fire alarm systems. Also known as audible and visual sirens, these alarms can meet specific customer requirements regarding alarm loudness and installation location, simultaneously emitting both audible and visual alarm signals.

[0003] In industries such as petroleum, chemical, thermal, and nuclear power, there is a constant possibility of generating gases such as methane, hydrogen sulfide, and carbon monoxide. These substances, when mixed with air, can form explosive mixtures; they may also produce oxygen to support combustion and explosion. When the concentration of the mixture reaches the explosive range, the presence of an ignition source can cause serious accidents such as explosions and fires. Explosions and fires can impact or damage audible and visual alarms, potentially severely affecting their effectiveness.

[0004] It is necessary to ensure that the audible and visual alarm works reliably; since the audible and visual alarm usually operates with electricity, it is also necessary to avoid the audible and visual alarm from triggering a mixture. Utility Model Content

[0005] Therefore, it is necessary to provide explosion-proof alarms and alarm systems to address at least one of the above-mentioned problems.

[0006] In a first aspect, this application provides an explosion-proof alarm, which includes: an explosion-proof cavity, comprising a first cover, a second cover, an explosion-proof gland, and an explosion-proof wire-passing plug, wherein the first cover and the second cover are sealed together, the explosion-proof gland is disposed in the first cover, and the explosion-proof wire-passing plug is disposed in the second cover; a transfer circuit board disposed within the explosion-proof cavity; an alarm cavity disposed outside the explosion-proof cavity and connected to the second cover; and an alarm circuit board disposed within the alarm cavity, comprising a wire passing through the explosion-proof wire-passing plug, and the alarm circuit board being electrically connected to the transfer circuit board.

[0007] With its first cover, second cover, and alarm chamber, the explosion-proof alarm is easy to install and has a simple structure. The flameproof gland and flameproof wiring plug ensure the performance of the circuit board within the flameproof chamber and also help prevent external explosives such as coal dust from entering the flameproof chamber. The explosion-proof alarm is suitable for harsh environments such as underground coal mines and can be used in explosive atmospheres.

[0008] In some embodiments, the first cover has a groove and a first annular groove, the first annular groove surrounding the groove and spaced apart from the groove; the second cover includes a convex ring and has a second annular groove, the convex ring passing through the groove and engaging with the groove, the second annular groove surrounding the convex ring, and the outer diameter of the second annular groove being smaller than the inner diameter of the first annular groove.

[0009] With this configuration, the first and second covers can fit together tightly; the L-shaped explosion-proof path formed by the two can effectively cope with explosion situations and ensure the operation of the transfer circuit board.

[0010] For example, the explosion-proof grate is disposed on the side wall of the first cover.

[0011] In some embodiments, the first cover and the second cover are aluminum covers, respectively.

[0012] With this design, the first and second covers are lightweight, have good oxidation and corrosion resistance, and stable performance.

[0013] In some embodiments, the explosion-proof cavity further includes a first sealing ring disposed in the second annular groove; the second cover has a third annular groove facing the alarm cavity; the alarm cavity includes a third cover and a second sealing ring, the second sealing ring being disposed in the third annular groove, the third cover abutting against the second sealing ring, and the edge of the third cover being fitted by the outer wall of the third annular groove.

[0014] This design improves the sealing of the explosion-proof chamber and the alarm chamber, which helps prevent dust and flammable gases from entering the two chambers.

[0015] In some embodiments, the alarm circuit board is an audio-visual circuit board; the alarm cavity includes a third cover and an explosion-proof mesh, at least a portion of the third cover is a light-transmitting portion; the third cover has an array of multiple sound transmission holes; the explosion-proof mesh is located inside the third cover and covers the multiple sound transmission holes.

[0016] This setup enables both audible and visual alarms, with a loud sound, and also protects the alarm circuit board.

[0017] In some embodiments, the alarm circuit board includes a speaker and an alarm light, the speaker having multiple sound transmission holes and the alarm light having a light-transmitting part; the alarm circuit board includes an explosion-proof epoxy resin covering the speaker and the alarm light.

[0018] With this configuration, even if a malfunction is detected during an audible and visual alarm, it will not ignite the surrounding flammable gas environment, effectively ensuring the safety and reliability of the explosion-proof alarm in flammable and explosive hazardous environments.

[0019] In some embodiments, the alarm cavity also includes a horn-shaped acoustic cavity support located inside the third cover. The large end of the acoustic cavity support covers multiple sound transmission holes, and the small end of the acoustic cavity support corresponds to the loudspeaker.

[0020] This setup allows for increased sound intensity by utilizing the acoustic cavity support.

[0021] In some embodiments, the alarm cavity further includes a waterproof and breathable membrane and a sound cavity sealing ring. The waterproof and breathable membrane is located on the side of the sound cavity support facing away from the multiple sound transmission holes. The waterproof and breathable membrane covers the small end of the sound cavity, and the sound cavity sealing ring surrounds the waterproof and breathable membrane and is held by the sound cavity support and the alarm circuit board.

[0022] This design is waterproof and can also balance the sound pressure in the cavity.

[0023] In some implementations, the adapter circuit board includes a processor for controlling the alarm type of the alarm circuit board.

[0024] This setup allows for the issuance of different alarms, making it easier for personnel to distinguish between different situations.

[0025] Secondly, this application provides an alarm system, which includes: the aforementioned explosion-proof alarm; and an alarm controller, which is communicatively connected to the explosion-proof alarm.

[0026] The alarm system described in this application has explosion-proof function and can be remotely controlled and alarmed. Attached Figure Description

[0027] Figure 1 A schematic exploded view of an explosion-proof alarm according to one or more embodiments;

[0028] Figure 2 This is a schematic cross-sectional view of an explosion-proof alarm according to one or more embodiments;

[0029] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0030] Figure 4 This is a schematic top view of an explosion-proof alarm according to one or more embodiments;

[0031] Figure 5 This is a schematic diagram of the relationship between an alarm system according to one or more embodiments.

[0032] Explanation of reference numerals in the attached drawings: 1. First cover; 101. Groove; 102. First annular groove; 2. Second cover; 21. Protruding ring; 201. Second annular groove; 202. Third annular groove; 3. Third cover; 301. Sound transmission hole; 4. Sound cavity support;

[0033] 100. Explosion-proof cavity; 110. Explosion-proof gland; 120. Explosion-proof wiring plug; 130. First sealing ring; 200. Alarm cavity; 210. Second sealing ring; 220. Explosion-proof mesh; 230. Waterproof and breathable membrane; 240. Sound cavity sealing ring; 300. Adapter circuit board; 310. Processor; 400. Alarm circuit board; 410. Speaker; 420. Alarm light;

[0034] 1000 Alarm system; 1100 Explosion-proof alarm; 1200 Alarm controller. Detailed Implementation

[0035] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0036] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0037] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. For example, a first sealing ring may also be referred to as a second sealing ring, and a second sealing ring may also be referred to as a first sealing ring. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this application, unless otherwise expressly specified and limited, the terms "connected," "linked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a flexible connection or a rigid connection along at least one direction; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium, or a direct connection with an intermediate medium present; and they can also refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. The terms "installed," "set," "fixed," etc., can be broadly understood as connection. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0040] refer to Figure 1 , Figure 1 An explosion-proof alarm device according to an embodiment of this application is shown. In an exemplary embodiment, the explosion-proof alarm device 1100 includes an explosion-proof cavity 100, an alarm cavity 200, a transition circuit board 300, and an alarm circuit board 400.

[0041] Combination Figure 2 As shown, Figure 2 This is a cross-sectional schematic diagram of the explosion-proof alarm 1100 in an embodiment of this application. For ease of description, a spatial rectangular coordinate system XYZ is established. In some embodiments, the explosion-proof cavity 100 includes a first cover 1 and a second cover 2. The first cover 1 and the second cover 2 are disposed opposite to each other along the Z-axis direction, and the first cover 1 and the second cover 2 are sealed together.

[0042] The alarm chamber 200 is located outside the explosion-proof chamber 100. The alarm chamber 200 is connected to the explosion-proof chamber 100, specifically, to the second cover 2. The alarm chamber 200 is sealed to the second cover 2. The first cover 1, the second cover 2, and the alarm chamber 200 are arranged sequentially, making the explosion-proof alarm 1100 simple in structure and easy to assemble.

[0043] The adapter circuit board 300 is disposed within the explosion-proof cavity 100, for example, it may be disposed within the second cover 2. The explosion-proof cavity 100 also includes an explosion-proof gland 110. The explosion-proof gland 110 may be disposed within the first cover 1. The adapter circuit board 300 can be electrically connected to an external device via a cable that passes through the explosion-proof gland 110 to extend from inside the explosion-proof cavity 100 to the outside of the explosion-proof cavity 100. The explosion-proof gland 110 helps prevent external dust from entering the explosion-proof cavity.

[0044] An alarm circuit board 400 is disposed within an alarm cavity 200, for example, it may be disposed within a second cover 2. The explosion-proof cavity 100 also includes an explosion-proof wire-passing plug 120. The explosion-proof wire-passing plug 120 is disposed within the second cover 2. The alarm circuit board 400 may include wires (not shown) passing through the explosion-proof wire-passing plug 120, and the alarm circuit board 400 is electrically connected to a transition circuit board 300. Alternatively, for example, the transition circuit board 300 may include wires before assembly, but after assembly, it can still be considered that the alarm circuit board 400 includes wires. The explosion-proof wire-passing plug 120 helps prevent the flow of foreign matter between the explosion-proof cavity 100 and the alarm cavity 200.

[0045] The explosion-proof alarm 1100 of this application embodiment is safe to use and can adapt to harsh environments; the explosion-proof cavity 100 can effectively prevent external smoke and dust from entering, avoid the malfunctions that may be caused by the accumulation of flammable coal dust on the transfer circuit board 300, and increase the safety and reliability of underground work; in addition, it can improve the protection level.

[0046] refer to Figure 2 and Figure 3 The first cover 1 may have a groove 101, which faces the second cover 2 along the Z-axis. The second cover 2 includes a protruding ring 21, which passes through and fits into the groove 101. The outer wall surface of the protruding ring 21 can be tightly fitted to the inner wall surface of the groove 101, and the bodies of the first cover 1 and the second cover 2 can abut against each other along the Z-axis. The first cover 1 and the second cover 2 can fit together tightly. Figure 3 In the radial longitudinal section shown, the first cover 1 and the second cover 2 form an L-shaped explosion-proof path, which can effectively cope with explosion situations and ensure the operation of the transfer circuit board 300. On the other hand, even if an explosion occurs inside the explosion-proof cavity 100, the flames accompanying the explosion will not leak into the designated explosion-proof area.

[0047] For example, the explosion-proof grate 110 is disposed on the side wall of the first cover 1. (See reference...) Figure 1 , Figure 2 as well as Figure 4The explosion-proof cavity 100 may include two explosion-proof glands 110, which may be arranged opposite to each other along the X-axis. The explosion-proof cavity 100 may also have two mounting holes, for example, two lugs respectively formed on the first cover 1. The two lugs are located on both sides of the first cover 1 along the Y-axis. The explosion-proof alarm 1100 can be installed in different locations.

[0048] The first cover 1 may have a first annular groove 102, which faces the second cover 2 along the Z-axis. The first annular groove 102 surrounds the groove 101, and the first annular groove 102 and the groove 101 are spaced apart. The first cover 1 can better accommodate the protruding ring 21 of the second cover 2.

[0049] The second cover 2 covers the first annular groove 102 to ensure sufficient explosion-proof path.

[0050] The second cover 2 has a second annular groove 201, which surrounds the protruding ring 21, for example, with the protruding ring 21 as a sidewall. (See reference) Figure 3 The outer diameter of the second annular groove 201 is smaller than the inner diameter of the first annular groove 102 to ensure sufficient explosion-proof path.

[0051] The explosion-proof cavity 100 also includes a first sealing ring 130 disposed in the second annular groove 201. The first cover 1 may include a pressure ring capable of at least partially extending into the second annular groove 201 to compress the first sealing ring 130. The explosion-proof cavity 100 has good sealing performance.

[0052] The second cover 2 may have a third annular groove 202 facing the alarm cavity 200. The alarm cavity 200 includes a third cover 3 and a second sealing ring 210. The second sealing ring 210 is disposed in the third annular groove 202, and the third cover 3 abuts against the second sealing ring 210, sealing the third cover 3 with the second cover 2, which helps to prevent dust and combustible gases from entering the alarm cavity 200.

[0053] refer to Figure 3 The outer wall of the third annular groove 202 may be higher than the inner wall. The edge of the third cover 3 may be fitted over the outer wall of the third annular groove 202. The alarm cavity 200 has good sealing and explosion-proof capabilities.

[0054] The first cover 1 and the second cover 2 can each be an aluminum cover, exemplarily, they can be die-cast aluminum. The first cover 1 and the second cover 2 are lightweight, have stable performance, and good oxidation and corrosion resistance. The structural layout of the first cover 1 and the second cover 2 can be manufactured by die casting, making manufacturing easy.

[0055] The first cover 1 and the second cover 2 can be fixed by a flange structure. The explosion-proof cavity 100 and the alarm cavity 200 do not need to be sealed with glue to avoid seal failure caused by glue aging.

[0056] The groove 101 can be a circular groove, and each annular groove can be a circular ring. The explosion-proof alarm 1100 can be equipped with internal grounding and external grounding, which helps to improve anti-static capability.

[0057] refer to Figure 1 and Figure 2 In some embodiments, the alarm circuit board 400 is an audible and visual circuit board. Specifically, the alarm circuit board 400 may include a speaker 410 and an alarm light 420. The explosion-proof alarm 1100 is capable of providing audible and visual alarms.

[0058] The alarm cavity 200 may include a third cover 3. The third cover 3 has multiple sound transmission holes 301 for transmitting sound from the inside out. These sound transmission holes 301 can be arranged in a circumferential array. The loudspeaker 410 can correspond to multiple sound transmission holes 301 along the Z-axis direction, and the sound transmission holes 301 can penetrate the body of the third cover 3 along the Z-axis direction. The sound transmission holes 301 are designed to maximize the sound pressure of the loudspeaker 410.

[0059] The alarm cavity 200 may also include a sound cavity support 4. The sound cavity support 4 may be a horn-shaped structure with a large end and a small end. The sound cavity support 4 is located inside the third cover 3. The large end of the sound cavity support 4 covers multiple sound transmission holes 301, and the small end of the sound cavity support 4 corresponds to the speaker 410, which can increase the sound intensity.

[0060] The alarm chamber 200 may also include a waterproof and breathable membrane 230, which is located on the side of the acoustic chamber support 4 facing away from the multiple sound transmission holes 301, and covers the small end of the hole. The waterproof and breathable membrane 230 is waterproof, which helps to improve the IP protection rating of the explosion-proof alarm 1100. While being waterproof, it is also breathable to balance the sound pressure in the chamber.

[0061] The alarm cavity 200 may also include an explosion-proof mesh 220, which is located inside the third cover 3 and covers multiple sound transmission holes 301. The explosion-proof mesh 220 can prevent small insects from entering the alarm cavity 200 and helps protect other components located inside it, such as the waterproof and breathable membrane 230; in addition, it also blocks particles or dust to a certain extent.

[0062] The alarm cavity 200 may also include a cavity sealing ring 240. The cavity sealing ring 240 surrounds the waterproof and breathable membrane 230 and may be disposed on the cavity support 4. The cavity sealing ring 240 may be clamped by the cavity support 4 and the alarm circuit board 400, which helps to seal. Exemplarily, the alarm circuit board 400 includes a sealing shell covering the speaker 410.

[0063] At least a portion of the third cover 3 is a light-transmitting part. An alarm light 420 corresponds to the light-transmitting part. For example, multiple alarm lights 420 are arranged around the speaker 410, and may be located outside the acoustic cavity support 4 and the acoustic cavity sealing ring 240. The third cover 3 as a whole can be a light-transmitting cover, such as a red semi-transparent cover. The alarm light 420 can be an LED light, capable of emitting a specific color of light, and its color can be adjusted by the light-transmitting part.

[0064] The alarm circuit board 400 includes explosion-proof epoxy resin covering the speaker 410 and the alarm light 420. All electrical components of the alarm circuit board 400 are covered by the explosion-proof epoxy resin. The thickness of the epoxy resin is sufficient to form an intrinsically safe audible and visual alarm assembly. Even if a malfunction occurs during the audible and visual alarm, it will not ignite the surrounding flammable gas environment, effectively ensuring the safety and reliability of the explosion-proof alarm 1100 in flammable and explosive hazardous environments.

[0065] refer to Figure 5 The adapter circuit board 300 may include a processor 310. The processor 310 is used to control the alarm type of the alarm circuit board 400. The processor 310 can control the speaker 410 and the alarm light 420, and can adjust different combinations of audio, light color, light flashing and siren duration to emit different alarms, making it easier for personnel to distinguish different situations.

[0066] This application provides an alarm system 1000. The alarm system 1000 includes an explosion-proof alarm 1100 and an alarm controller 1200. The explosion-proof alarm 1100 can be any of the aforementioned explosion-proof alarms. The alarm controller 1200 is communicatively connected to the explosion-proof alarm 1100, for example, via a network. The alarm system 1000 of this application has explosion-proof functionality and can be remotely controlled and alarmed.

[0067] Even in the event of a fire and violent explosion, the explosion-proof alarm 1100 will not be damaged and will continue to operate stably, providing fire warnings to personnel on site. After the fire is extinguished, the alarm can be deactivated via the alarm controller 1200. The explosion-proof alarm 1100 has few disassembled components, facilitating production, assembly, disassembly, and maintenance.

[0068] The explosion-proof alarm 1100 has a simple structure, good dustproof and anti-static performance, is easy to install, and has stable performance. It can effectively prevent external coal dust from entering the explosion-proof cavity 100 or alarm cavity 200, and is suitable for use in underground coal mines and harsh environments. It solves the problem that ordinary alarms cannot continue to be used in explosive environments, and ensures the safety of underground operations. Even if an explosion occurs inside the shell, the flames accompanying the explosion will not leak into the designated explosion-proof area. Moreover, it does not require the use of special sealing materials to ensure the airtightness of the shell, and can prevent explosions caused by the deterioration of sealing materials in advance.

[0069] The technical features of the above-disclosed embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The embodiments disclosed above merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of patent protection of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of patent protection claimed by this application. Therefore, the scope of patent protection of this application should be determined by the appended claims.

Claims

1. An explosion-proof alarm, characterized in that, include: An explosion-proof cavity includes a first cover, a second cover, an explosion-proof gland, and an explosion-proof wire plug. The first cover and the second cover are sealed together. The explosion-proof gland is disposed on the first cover, and the explosion-proof wire plug is disposed on the second cover. An adapter circuit board is located inside the explosion-proof cavity; An alarm chamber is located outside the explosion-proof chamber and connected to the second cover. as well as An alarm circuit board is disposed within the alarm cavity and includes wires passing through the explosion-proof wire plug. The alarm circuit board is electrically connected to the adapter circuit board.

2. The explosion-proof alarm according to claim 1, characterized in that, The first cover has a groove and a first annular groove, the first annular groove surrounding the groove and being spaced apart from the groove; The second cover includes a convex ring and a second annular groove. The convex ring passes through the groove and engages with the groove. The second annular groove surrounds the convex ring, and the outer diameter of the second annular groove is smaller than the inner diameter of the first annular groove.

3. The explosion-proof alarm according to claim 2, characterized in that, The explosion-proof cavity also includes a first sealing ring, which is disposed in the second annular groove; The second cover has a third annular groove facing the alarm cavity; The alarm cavity includes a third cover and a second sealing ring. The second sealing ring is disposed in the third annular groove. The third cover abuts against the second sealing ring, and the edge of the third cover is sleeved by the outer wall of the third annular groove.

4. The explosion-proof alarm according to claim 1, characterized in that, The first cover and the second cover are both aluminum covers.

5. The explosion-proof alarm according to claim 1, characterized in that, The alarm circuit board is an audio-visual circuit board; The alarm cavity includes a third cover and an explosion-proof mesh. At least a portion of the third cover is a light-transmitting part. The third cover has an array of multiple sound transmission holes. The explosion-proof mesh is located inside the third cover and covers the multiple sound transmission holes.

6. The explosion-proof alarm according to claim 5, characterized in that, The alarm circuit board includes a speaker and an alarm light, the speaker corresponding to the plurality of sound transmission holes and the alarm light corresponding to the light-transmitting part; The alarm circuit board includes explosion-proof epoxy resin covering the speaker and the alarm light.

7. The explosion-proof alarm according to claim 6, characterized in that, The alarm cavity also includes a horn-shaped acoustic cavity support, which is located inside the third cover. The large end of the acoustic cavity support covers the plurality of sound transmission holes, and the small end of the acoustic cavity support corresponds to the loudspeaker.

8. The explosion-proof alarm according to claim 7, characterized in that, The alarm cavity also includes a waterproof and breathable membrane and a sound cavity sealing ring. The waterproof and breathable membrane is located on the side of the sound cavity support facing away from the plurality of sound transmission holes. The waterproof and breathable membrane covers the small opening end. The sound cavity sealing ring surrounds the waterproof and breathable membrane and is clamped by the sound cavity support and the alarm circuit board.

9. The explosion-proof alarm according to claim 6, characterized in that, The adapter circuit board includes a processor, which is used to control the alarm type of the alarm circuit board.

10. An alarm system, characterized in that, include: Explosion-proof alarm as described in any one of claims 1 to 9; as well as An alarm controller is communicatively connected to the explosion-proof alarm.

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