Explosion-proof sound amplification structure

Abstract

The utility model discloses an anti -explosion loudspeaker structure, including pronunciation subassembly, sealing assembly, former sound cavity, rear sound cavity, seal glue layer, PCBA board, pronunciation subassembly one end is sealedly connected with former sound cavity through sealing assembly, pronunciation subassembly other end is fixedly connected with PCBA board, and the both are detachably connected with rear sound cavity, and former sound cavity is detachably connected with rear sound cavity, be equipped with the glue hole on the rear sound cavity, and the glue hole is filled with glue and forms the seal glue layer of all components on the PCBA board, is used for insulating external gas, prevents the component on the PCBA board from current arc or overheat when working, pronunciation subassembly includes shell, vibrating reed and resonance piece, vibrating reed is connected with resonance piece and is sealed in the shell, forms airtight resonance cavity, is used for when vibrating reed drive, drives resonance piece resonance to amplify sound.

Description

Technical Field

[0001] This utility model relates to the field of gas detection technology, and in particular to an explosion-proof amplification structure. Background Technology

[0002] Gas detection alarms are an essential component of commonly used gas detection equipment. Because some gases are flammable and can even explode during combustion, gas detection equipment must be explosion-proof. Therefore, audible alarms, as components of gas detection equipment, must also be explosion-proof.

[0003] In fields such as petrochemicals, mining, and municipal gas, leaks of flammable and explosive gases or dust can easily lead to safety accidents. Gas detection equipment needs to issue high-decibel alarms promptly. However, these scenarios place stringent requirements on the intrinsic safety and explosion-proof performance of the equipment (operating current must be controlled within 50mA), resulting in significant deficiencies in existing technologies. Explosion-proof and loudspeaker amplification are difficult to achieve simultaneously: In order to meet the 50mA current limit, existing alarms (such as conventional buzzers) need to reduce the driving energy of the vibrating plate, resulting in insufficient sound intensity and the alarm sound is easily masked by industrial noise. If the volume is increased and the current control is relaxed, the flammable medium may be ignited due to current arcing or component overheating, causing safety risks.

[0004] Defective sealing design leads to explosion-proof failure: PCBA boards are isolated by only a simple outer shell, and external flammable gases, dust and moisture can easily enter the equipment through gaps. This may cause components to become damp and dusty, leading to failure, or they may come into contact with electrical components and be ignited, thus compromising the explosion-proof integrity.

[0005] Insufficient acoustic structure optimization: Lack of professional resonance design; no matching resonance structure between the vibrator and the cavity, leading to easy sound diffusion and loss during propagation; furthermore, the function of the front and rear acoustic cavities is not differentiated, causing some sound to leak rearward, further weakening the warning volume and failing to meet the needs of industrial scenarios. Utility Model Content In view of the problems existing in the prior art, this utility model provides an explosion-proof amplification structure.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: This utility model provides an explosion-proof loudspeaker structure, including a sound-producing component, a sealing component, a front sound cavity, a rear sound cavity, a sealing layer, and a PCBA board; One end of the sound-producing component is sealed to the front sound cavity through a sealing component, and the other end of the sound-producing component is fixedly connected to the PCBA board. Both are detachably connected to the rear sound cavity, and the front sound cavity and the rear sound cavity are detachably connected. The rear acoustic cavity is provided with a potting hole. Glue is poured in through the potting hole to form a sealing layer that covers all components on the PCBA board. This layer is used to isolate external gases and prevent arcing or overheating of the components on the PCBA board during operation. The sound-producing component includes a housing, a vibrating plate, and a resonating plate. The vibrating plate and the resonating plate are connected and sealed inside the housing to form a closed resonant cavity, which is used to drive the resonating plate to resonate and amplify the sound when the vibrating plate is driven.

[0007] Preferably, the vibrating plate and the resonant plate are connected by adhesive dispensing, and both have the same resonant frequency to form an internal resonance.

[0008] Preferably, the vibrating plate and the outer casing are sealed by ultrasonic welding.

[0009] Preferably, the sound-producing component is welded and fixed to the PCBA board, and the welded assembly of the sound-producing component and the PCBA board is detachably connected to the rear sound cavity by screws, and the front sound cavity and the rear sound cavity are detachably connected by screws. Preferably, the sound-producing component further includes pins and connecting wires, with the two ends of the connecting wires connected to the vibrating plate and the pins, respectively.

[0010] Preferably, the rear acoustic cavity, together with the vibrating plate and the resonating plate, forms a sealed cavity to prevent sound from leaking outwards, while the front acoustic cavity serves as a sound amplification channel to amplify the sound generated by the sound-producing component. Preferably, the outer periphery of the sealing component is tightly fitted to the inner wall of the front acoustic cavity, and the inner periphery is tightly fitted to the outer wall of the outer shell of the sound-producing component, so as to prevent dust and water from entering the interior of the sound-producing component through the connection gap between the sound-producing component and the front acoustic cavity.

[0011] Preferably, the sealing component is a sealing ring.

[0012] The technical solution of this utility model has the following beneficial effects: Multi-layer sealing blocks contact with hazardous media: On the one hand, the rear sound cavity is filled with glue through the glue-filling hole to form a sealing layer, which can completely wrap all components on the PCBA board, forming a gapless sealed barrier. This can completely isolate external flammable and explosive gases and dust, and prevent the current arcing or overheating generated by the components on the PCBA board from directly contacting hazardous media. On the other hand, the vibrating plate and the shell are sealed by ultrasonic welding, and the sound-producing component and the front sound cavity are tightly connected by a sealing ring. This can effectively prevent dust, water vapor and flammable media from entering the sealed resonant cavity inside the sound-producing component, structurally eliminating the risk of explosion and combustion, and meeting the core requirements of intrinsically safe explosion protection for equipment isolation from hazardous environments.

[0013] Dual protection of insulation and heat: The sealant layer not only isolates gases but also has insulating properties, preventing the exposure of sparks caused by short circuits in PCBA board circuits; at the same time, the sealant can slow down the heat transfer of components to the outside, preventing high-temperature environments from igniting surrounding flammable media, further improving explosion-proof reliability, and ensuring safe use even under minor equipment failure conditions.

[0014] The resonant structure achieves efficient sound amplification: the vibrating plate and resonant plate of the sound-producing component are connected by adhesive and have the same resonant frequency. They are sealed in the shell to form a closed resonant cavity. When the vibrating plate is driven to vibrate, it can drive the resonant plate to resonate synchronously, so that the sound wave energy is superimposed and enhanced. At the same time, the rear sound cavity, together with the vibrating plate and resonant plate, forms a closed cavity, which can prevent sound from leaking backward and ensure that the sound is concentrated and propagated to the front sound cavity. The front sound cavity serves as a dedicated sound amplification channel, further reducing sound wave loss and effectively solving the problem of insufficient sound intensity under low current drive. Even in noisy industrial environments, the alarm sound can be clearly heard, avoiding warning failure.

[0015] Sealing ring and ultrasonically welded reinforced components: The outer circumference of the sealing ring fits tightly against the inner wall of the front sound cavity, and the inner circumference fits tightly against the outer wall of the sound component's outer shell. This effectively prevents dust, moisture, and flammable media from entering through the connection gap between the sound component and the front sound cavity. At the same time, the vibrating plate in the sound component is sealed to the outer shell by ultrasonic welding, forming a continuous and gapless resonant cavity protection structure. This prevents external impurities from entering the sealed resonant cavity and affecting the operation of the vibrating components. The double sealing further enhances the overall explosion-proof reliability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a schematic diagram of the structure of the sound-producing component of this utility model; Figure 4 This is a cross-sectional view of the sound-producing component of this utility model. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0018] In the description of this utility model, 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", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 utility model.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] Reference Figures 1 to 4 This utility model provides an explosion-proof loudspeaker structure, including a sound-producing component 1, a sealing component 2, a front sound cavity 3, a rear sound cavity 4, a sealing layer 5, and a PCBA board 6; One end of the sound-producing component 1 is sealed to the front sound cavity (3) through the sealing component 2, which can effectively block external dust, water vapor and flammable and explosive gases from entering the sound-producing component, avoid impurities from interfering with the normal operation of the vibrating plate 104 and the resonating plate 105, and prevent external dangerous gases from contacting the electrical components inside the sound-producing component; the sealing component 2 is a sealing ring.

[0023] After the other end of the sound-producing component 1 is fixedly connected to the PCBA board 6, the two are detachably connected to the rear sound cavity 4. This ensures the relative position stability of the core functional components (sound-producing component and PCBA board 6), avoids poor circuit contact due to loosening under vibration environment (which may cause arcing or overheating), and facilitates the later inspection or replacement of internal components. Furthermore, the detachable connection between the front sound cavity 3 and the rear sound cavity 4 further realizes the modular assembly of the overall structure, which provides convenience for production assembly and maintenance while ensuring the airtightness of the sound cavity.

[0024] The rear acoustic cavity 4 has a potting hole through which adhesive is poured to form a sealing layer 5 that encapsulates all components on the PCBA board 6. This layer isolates external gases and prevents arcing or overheating of the components on the PCBA board 6 during operation. The potting hole in the rear acoustic cavity 4 provides a precise channel for adhesive pouring, ensuring that the adhesive completely encapsulates all components on the PCBA board 6. The cured sealing layer 5 forms a "gap-free, airtight barrier" for the vibrating disc, completely isolating external flammable and explosive gases and dust from contact with the components on the PCBA board. The sealing layer 5, through the insulating and thermally insulating properties of the adhesive, prevents arcing sparks from being directly exposed to the external environment and slows down the heat transfer from the components to the outside, preventing high temperatures from igniting surrounding flammable media.

[0025] The sound-producing component 1 is a buzzer, which includes a housing 103, a vibrating plate 104, and a resonant plate 105. The vibrating plate 104 and the resonant plate 105 are connected and sealed within the housing 103 to form a closed resonant cavity. When the buzzer is driven, the vibrating plate 104 vibrates at a higher frequency, further generating sound. The vibrating plate drives the resonant plate 105 to vibrate, and the vibration forms resonance. The sound is amplified after resonance, thus increasing the volume of the sound.

[0026] Furthermore, the vibrating plate 104 and the resonant plate 105 are connected by adhesive dispensing, enabling precise positioning and rigid fixation of both. This ensures that their relative positions remain unchanged during vibration, preventing resonant frequency shifts due to loosening. The adhesive dispensing method also fills the tiny gaps between the vibrating plate and the resonant plate, forming a bonding layer with both adhesive strength and buffering properties after curing. This layer resists vibration impacts and prevents wear or electrochemical corrosion caused by direct metal-to-metal contact. The vibrating plate 104 and the resonant plate 105 have the same resonant frequency, forming internal resonance. When the vibrating plate is driven by current, the resonant plate vibrates synchronously at the same frequency, amplifying the sound wave energy. This solves the problem of insufficient sound intensity under low current driving (intrinsically safe explosion-proof limitations), ensuring that the alarm sound remains clearly identifiable in complex environments.

[0027] The vibrating plate 104 and the outer shell 103 are sealed by ultrasonic welding to form a continuous and gapless sealed structure, which can completely block external flammable and explosive gases, dust or water vapor from entering the sealed resonant cavity.

[0028] Furthermore, the sound-producing component 1 is welded and fixed to the PCBA board 6, and the welded assembly of the sound-producing component 1 and the PCBA board 6 is detachably connected to the rear acoustic cavity 4 by screws. The front acoustic cavity 3 and the rear acoustic cavity 4 are also detachably connected by screws. The sound-producing component 1 also includes a pin 101 and a connecting wire 102. The two ends of the connecting wire 102 are respectively connected to the vibrating plate 104 and the pin 101, and the connecting wire 102 and the pin 101 are assembled and connected to the outer shell 103 by clips.

[0029] Furthermore, the rear acoustic cavity 4, together with the vibrating plate 104 and the resonant plate 105, forms a sealed cavity to prevent sound leakage to the rear, thereby improving sound energy utilization and acoustic stability. Simultaneously, the front acoustic cavity 3 serves as a sound amplification channel, used to amplify the sound generated by the sound-producing component 1. The outer periphery of the sealing component 2 is tightly fitted to the inner wall of the front acoustic cavity 3, and its inner periphery is tightly fitted to the outer wall of the outer shell 103 of the sound-producing component 1, to prevent dust and water from entering the interior of the sound-producing component 1 through the connection gap between the sound-producing component 1 and the front acoustic cavity 3.

[0030] The technical solution of this utility model has the following beneficial effects: I. Enhanced explosion-proof safety, meeting intrinsic safety standards: Multi-layer sealing isolates risks: The rear sound cavity is filled with glue through the potting hole to form a sealing layer, which completely wraps all components on the PCBA board, isolating external flammable gases and dust without gaps, and preventing component current arcing or overheating from contacting dangerous media; the vibrating plate is ultrasonically welded and sealed to the shell, and the sound-producing component and the front sound cavity are tightly fitted by a sealing ring, preventing dust, water vapor and flammable media from entering the resonant cavity, thus eliminating the risk of explosion from a structural perspective.

[0031] Dual protection of insulation and heat: The sealant layer is both insulating and prevents short-circuit sparks from being exposed on the PCBA board; at the same time, it slows down the heat transfer of components and avoids high temperature ignition of flammable media, ensuring safety even in the event of minor equipment failure.

[0032] II. Optimize the amplification effect and resolve warning failure issues. In the sound-producing component, the vibrating plate and the resonating plate are connected by adhesive and have the same resonant frequency. They are sealed in the shell to form a closed resonant cavity. When vibrating, they resonate synchronously to achieve sound wave superposition and amplification. The rear sound cavity works with the vibrating plate and the resonating plate to suppress sound leakage to the rear. The front sound cavity serves as a dedicated amplification channel to reduce loss, effectively solving the problem of insufficient sound under intrinsically safe explosion-proof low current. The alarm sound is still clearly audible in noisy industrial sites.

[0033] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An explosion-proof loudspeaker structure, characterized in that, Includes a sound-producing component (1), a sealing component (2), a front sound cavity (3), a rear sound cavity (4), a sealing layer (5), and a PCBA board (6); One end of the sound-producing component (1) is sealed to the front sound cavity (3) through the sealing component (2). The other end of the sound-producing component (1) is fixedly connected to the PCBA board (6). Both are detachably connected to the rear sound cavity (4), and the front sound cavity (3) and the rear sound cavity (4) are detachably connected. The rear acoustic cavity (4) is provided with a potting hole. Glue is poured through the potting hole to form a sealing layer (5) that wraps all the components on the PCBA board (6). This layer is used to isolate external gas and prevent the components on the PCBA board (6) from arcing or overheating during operation. The sound-producing component (1) includes a housing (103), a vibrating plate (104), and a resonant plate (105). The vibrating plate (104) and the resonant plate (105) are connected and sealed inside the housing (103) to form a closed resonant cavity, which is used to drive the resonant plate (105) to resonate and amplify the sound when the vibrating plate (104) is driven.

2. The explosion-proof loudspeaker structure according to claim 1, characterized in that, The vibrating plate (104) and the resonant plate (105) are connected by adhesive dispensing, and the two have the same resonant frequency, forming an internal resonance.

3. The explosion-proof loudspeaker structure according to claim 1, characterized in that, The vibrating plate (104) and the outer shell (103) are sealed by ultrasonic welding.

4. The explosion-proof loudspeaker structure according to claim 1, characterized in that, The sound-producing component (1) is welded and fixed to the PCBA board (6), and the welded whole of the sound-producing component (1) and the PCBA board (6) is detachably connected to the rear sound cavity (4) by screws. The front sound cavity (3) and the rear sound cavity (4) are detachably connected by screws.

5. The explosion-proof loudspeaker structure according to claim 1, characterized in that, The sound-producing component (1) also includes a pin (101) and a connecting wire (102), with the two ends of the connecting wire (102) connected to the vibrating plate (104) and the pin (101), respectively.

6. The explosion-proof loudspeaker structure according to claim 1, characterized in that, The rear acoustic cavity (4) works in conjunction with the vibrating plate (104) and the resonating plate (105) to form a sealed cavity, while the front acoustic cavity (3) serves as a sound amplification channel to amplify the sound generated by the sound-producing component (1).

7. The explosion-proof loudspeaker structure according to claim 1, characterized in that, The outer periphery of the sealing component (2) is tightly fitted to the inner wall of the front sound cavity (3), and the inner periphery is tightly fitted to the outer wall of the outer shell (103) of the sound component (1) to prevent dust and water from entering the interior of the sound component (1) through the connection gap between the sound component (1) and the front sound cavity (3).

8. The explosion-proof loudspeaker structure according to claim 1, characterized in that, The sealing component (2) is a sealing ring.

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