Sound cavity structure of mine-used sounder

Abstract

The present application relates to the field of loudspeaker, especially relates to a kind of mine sound's acoustic cavity structure, including shell, the shell inside formation hollow cavity, cavity is limitedly provided with partition plate and is divided into mid-frequency cavity and low-frequency cavity, the edge of partition plate is closely combined with the inner wall of shell, speaker unit is installed on the shell corresponding mid-frequency cavity and low-frequency cavity, also corresponding cavity is provided with inverted phase pipe;The present application is divided into mid-frequency cavity and low-frequency cavity by partition plate in shell, realizes the independent processing of mid-high frequency and low frequency sound by frequency division cavity structure design, realizes the independent propagation and resonance control of different frequency band sound, reduces the interference between frequency band, further optimizes tone quality by damping hole and tuning piece, so that speech signal is clear and discernible, especially in the noisy environment in pit, alarm and instruction transmission accuracy can be effectively improved.

Description

Technical Field

[0001] This invention relates to the field of loudspeakers, and in particular to a sound cavity structure for a mining loudspeaker. Background Technology

[0002] In underground mining operations, audio equipment is a crucial tool for safe communication and information transmission, and its performance directly affects the safety of workers and production efficiency. However, the unique underground environment places stringent demands on mining audio equipment: on the one hand, the underground space is enclosed, with high dust concentrations, high humidity, and continuous mechanical vibrations and impacts, making it difficult for ordinary audio equipment to adapt to such harsh environments, easily leading to problems such as sound quality distortion, volume attenuation, and damage to the sound cavity; on the other hand, underground operations require extremely high clarity of voice communication, especially for alarm signals and instructions, which must be accurately identifiable even in noisy environments.

[0003] With the development of technology, technicians in related fields have also made a lot of optimizations to mining audio equipment. In order to make a more accurate comparison, such as the bass-reflex speaker disclosed in Chinese Patent No. CN102006529B, which includes a cavity, a loudspeaker and a bass reflex tube, etc., when in use, through the cooperation between the sound cavity and sound channel formed inside the main body, and the loudspeaker and bass reflex tube connected thereto, the speaker has good low-frequency response performance, while maintaining low-frequency sound with low distortion and good output sound quality.

[0004] However, the aforementioned audio equipment still has some shortcomings in actual use:

[0005] The aforementioned equipment, by forming a single acoustic cavity structure within the cavity, suffers from poor acoustic resonance control. Consequently, when the speaker emits sound wave signals of different frequencies, these signals converge within the same acoustic cavity, causing mutual interference between the different frequencies. This results in muddy low-frequency response, distortion in mid-to-high frequencies, and low speech signal intelligibility, making it difficult to meet the high requirements for speech clarity in complex underground sound environments. Furthermore, the equipment lacks effective protective measures, and when used in complex underground environments, the single cavity formed by its main body is easily damaged by external mechanical vibrations and impacts.

[0006] Therefore, based on the above-mentioned viewpoints, there is still room for improvement in existing audio equipment for underground mining operations. Summary of the Invention

[0007] To address the aforementioned problems, this invention provides a sound cavity structure for a mining audio system, comprising a housing, wherein the interior of the housing is hollow to form a cavity, and a partition plate is provided within the cavity to divide it into a mid-frequency cavity and a low-frequency cavity. The edge of the partition plate is tightly fitted to the inner wall of the housing, and speaker units are installed on the housing corresponding to the mid-frequency cavity and the low-frequency cavity, and a bass reflex tube is also provided through the cavity.

[0008] The housing includes an outer shell, an inner shell, and a buffer layer. The intermediate frequency cavity and the low frequency cavity are both located inside the inner shell cavity. The inner shell and the outer shell are assembled together by bolts. The buffer layer is clamped and limited between the inner shell and the outer shell to form a multi-layered composite protective structure.

[0009] Preferably, the housing has a mounting hole corresponding to the speaker unit, the speaker unit is mounted at the mounting hole, and the inner and outer sides of the housing are respectively provided with a first sealing element and a second sealing element corresponding to the mounting hole and the speaker unit.

[0010] Preferably, the diameter of the first sealing element matches that of the mounting hole, and the first sealing element and the second sealing element cooperate to achieve a double seal at the mounting hole.

[0011] Preferably, the partition plate has a plurality of damping holes, and the damping holes are filled with tuning components.

[0012] Preferably, the buffer layer is spaced apart from the outer shell at both ends, and a plurality of heat dissipation components are provided between the inner shell and the outer shell corresponding to the two ends of the buffer layer. The heat dissipation components are sleeved on the outer side of the inner shell and abut against the inner wall of the outer shell.

[0013] Preferably, multiple heat dissipation components are provided between any end of the buffer layer and the outer shell.

[0014] Preferably, a plurality of air pipes are provided between the buffer layer and all heat dissipation components, and a plurality of air holes are uniformly opened circumferentially and axially in the air pipes, extending to the gap between the heat dissipation components and the outer shell.

[0015] Preferably, in the multi-layer heat sink, the two heat sinks far from the middle are respectively provided with elastic connecting members between the buffer layer and the outer shell, and the two heat sinks are slidably limited on the air pipe.

[0016] Preferably, the buffer layer is made of polyurethane elastic material and manufactured by high-temperature vulcanization process; the inner shell is preferably made of aluminum alloy material and manufactured by die casting to form an inner aluminum alloy skeleton; and the outer shell is preferably made of stainless steel material and welded by argon arc welding process.

[0017] In summary, this application includes at least one of the following beneficial technical effects:

[0018] This invention divides the interior of the housing into a mid-frequency cavity and a low-frequency cavity using a partition plate. Through the design of the frequency-divided cavity structure, it achieves independent processing of mid-high frequency and low-frequency sounds, realizes independent propagation and resonance control of sounds in different frequency bands, reduces interference between frequency bands, and further optimizes the sound quality through damping holes and tuning components, making the voice signal clear and distinguishable. Especially in noisy underground environments, the accuracy of alarm and command transmission is effectively improved.

[0019] II. The present invention adopts a composite shell structure of “inner aluminum alloy + middle buffer layer + outer stainless steel”. The inner aluminum alloy is lightweight and has good acoustic conductivity, which is conducive to sound diffusion; the middle buffer layer can absorb downhole vibration energy; and the outer stainless steel has excellent impact resistance, corrosion resistance and wear resistance, which protects the internal components of the sound cavity from damage by the harsh downhole environment.

[0020] Third, this invention utilizes the vibration energy encountered by the audio equipment during underground operation to drive relative deformation of the elastic connectors at both ends of the buffer layer. This causes several heat dissipation components inside the shell to slide and adjust, creating a squeezing or suction effect on the air between the heat dissipation components and between the heat dissipation components and the outer shell. This forces the air to flow through the air holes on the air pipe, and the heat from the inner shell is transferred to the flowing air via the aluminum alloy heat dissipation components. The air then dissipates the heat to the outside, achieving efficient heat dissipation and ensuring stable operation of the audio equipment in the complex underground environment. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the structure of the housing of the present invention.

[0024] Figure 3 This is a cross-sectional structural diagram of the housing of the present invention.

[0025] Figure 4 This is a schematic diagram of the structure of the first sealing element of the present invention.

[0026] Figure 5 This is a schematic diagram of the structure of the partition plate of the present invention.

[0027] Figure 6 This is the present invention. Figure 5 A magnified view of A in the middle.

[0028] Figure 7 This is a schematic diagram of the heat sink component of the present invention.

[0029] Figure 8 This is the present invention. Figure 7 A magnified view of B in the middle.

[0030] In the diagram, 1 is the housing; 10 is the outer shell; 11 is the inner shell; 12 is the buffer layer; 100 is the mid-frequency cavity; 101 is the low-frequency cavity; 2 is the partition plate; 20 is the damping hole; 21 is the tuning component; 3 is the speaker unit; 4 is the first seal; 40 is the second seal; 5 is the heat sink; 6 is the air pipe; 60 is the vent; and 7 is the elastic connector. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1 To be continued Figure 8 The embodiments of the present invention will be described in detail below.

[0032] This application discloses a sound cavity structure for a mining speaker. This application is mainly applied to speaker equipment used in underground operations. The internal cavity of the shell is divided into a mid-frequency cavity and a low-frequency cavity by a partition plate, so as to realize the independent propagation and resonance control of sound in different frequency bands, reduce interference between frequency bands, and improve sound quality and clarity. In addition, the internal sound cavity is sealed and protected by a multi-layer composite shell structure, which improves the stability of the underground operation.

[0033] Example 1: Refer to Figures 1 to 3 As shown, a sound cavity structure for a mining audio system includes a housing 1. The housing 1 has a hollow cavity inside, and a partition plate 2 is provided inside the cavity to divide it into a mid-frequency cavity 100 and a low-frequency cavity 101. The mid-frequency cavity 100 has a volume of 0.5L, and the low-frequency cavity 101 has a volume of 2.5L. The edge of the partition plate 2 is tightly fitted to the inner wall of the housing 1 to ensure good acoustic isolation between the mid-frequency cavity 100 and the low-frequency cavity 101, and to avoid sound waves interfering with each other between the two cavities. Speaker units 3 are installed on the housing 1 corresponding to the mid-frequency cavity 100 and the low-frequency cavity 101. The speaker units 3 are full-range speakers, and the full-range speakers use a 4-inch titanium diaphragm tweeter with a rated power of 5W and a rated resistance of 8Ω. A bass reflex tube (not shown in the figure) is also provided through the cavity.

[0034] In use, the mid-frequency sound waves generated by the speaker unit 3 resonate in the mid-frequency cavity 100, while the low-frequency sound waves oscillate in the low-frequency cavity 101. Through the acoustic isolation of the partition plate 2, the two frequency bands of sound waves vibrate fully in their respective independent mid-frequency cavity 100 and low-frequency cavity 101 to reduce mutual interference between sound waves of different frequency bands. This helps to improve the clarity of sound quality, so that even in the complex working environment underground, the layering and penetration of the sound can still be maintained, meeting the clear reception needs of underground workers for voice communication and early warning signals, and effectively improving the accuracy of alarm and instruction transmission.

[0035] Reference Figure 2 and Figure 3As shown, the housing 1 includes an outer shell 10, an inner shell 11, and a buffer layer 12. The intermediate frequency cavity 100 and the low frequency cavity 101 are both disposed in the inner shell 11. The inner shell 11 and the outer shell 10 are assembled together by bolts, and the buffer layer 12 is enclosed and confined within them to form a multi-layered composite housing 1 structure. It should be noted that, in order to prevent dust or water vapor in the downhole environment from entering the cavity through the gaps at the bolt connection and damaging the internal components, a sealing strip can also be provided at the bolt connection to improve the overall sealing and protection effect of the housing 1. The phase inverter tube (not shown in the figure) is connected to the low frequency cavity 101. One end of the tube passes through the inner shell 11 and extends into the low frequency cavity 101, while the other end passes through the outer shell 10 and communicates with the external environment, forming a channel for sound wave conduction. This is an existing technical means and will not be described in detail. In use, the buffer layer 12 between the inner shell 11 and the outside is used to buffer and absorb the vibration energy in the well. At the same time, the inner shell 11 and the outer shell 10 protect the buffer layer 12 and the speaker components from damage caused by the harsh environment in the well, so as to avoid affecting the transmission of voice communication or early warning information.

[0036] Reference Figure 3 and Figure 4 As shown, the outer casing 10 has a mounting hole corresponding to the speaker unit 3, and the speaker unit 3 is installed at the mounting hole. The inner and outer sides of the outer casing 10 are respectively provided with a first sealing member 4 and a second sealing member 40 corresponding to the mounting hole and the speaker unit 3.

[0037] Furthermore, the inner first seal 4 is preferably a silicone sealing ring and the diameter of the first seal 4 matches the diameter of the mounting hole, and the outer second seal 40 is preferably a fluororubber sealing gasket.

[0038] Reference Figure 3 and Figure 4 As shown, the diameter of the first seal 4 matches that of the mounting hole, and the first seal 4 and the second seal 40 cooperate with each other to achieve a double seal at the mounting hole.

[0039] During use, the pre-tightening force of the bolts tightly compresses the first seal 4 and the second seal 40, achieving a sealed connection between the inner shell 11 and the outer shell 10. The double sealing protection of the outer second seal 40 and the inner first seal 4 prevents dust and water vapor from the well from entering the cavity of the inner shell 11 through the assembly gaps, ensuring that dust and water vapor cannot invade the cavity and interfere with the acoustic environment in the mid-frequency cavity 100 and the low-frequency cavity 101, effectively ensuring the long-term stable operation of the audio equipment.

[0040] Furthermore, refer to Figures 3 to 6As shown, since the partition plate 2 is fixedly positioned between the mid-frequency cavity 100 and the low-frequency cavity 101, when the speaker unit 3 generates sound waves of different frequencies that enter the cavity, the sound waves in the mid-frequency cavity 100 and the low-frequency cavity 101 will generate sound wave reflections of different frequencies on both sides of the partition plate 2. This causes the partition plate 2 between the mid-frequency cavity 100 and the low-frequency cavity 101 to easily resonate due to the rigid connection between it and the inner shell 11, forming standing waves on the partition plate 2. This affects the stability of the sound wave vibration in the mid-frequency cavity 100 and the low-frequency cavity 101, and consequently affects the accuracy of voice communication or warning information transmission. Therefore, in order to avoid mutual interference of sound waves and affect the sound quality, the partition plate 2 is provided with several damping holes 20. The damping holes 20 are filled with corresponding tuning components 21. The tuning components 21 are made of polyester fiber tuning cotton, the diameter of the damping holes 20 is 4mm, and the density of the tuning components 21 is 30kg / m³. It should be noted that the high-frequency components generated by the full-range loudspeaker are mainly acoustically filtered and attenuated through the volume of the mid-frequency cavity 100 and the low-frequency cavity 101, as well as the damping hole 20 on the partition plate 2, thereby achieving separation of mid-high frequency and low frequency.

[0041] Polyester fiber sound-tuning cotton has good elasticity and breathability. When sound waves pass through the damping hole 20, the tuning component 21 can form a certain damping effect on the sound waves, effectively absorbing and attenuating some of the sound wave energy, thereby adjusting the sound energy transmission efficiency between the mid-frequency cavity 100 and the low-frequency cavity 101. At the same time, the tuning component 21 can also suppress the disordered reflection and standing wave phenomenon of sound waves inside the cavity, making the vibration of mid-frequency and low-frequency sound waves more stable and orderly, avoiding noise or distortion caused by mutual interference of sound waves, ensuring the independence and stability of the acoustic environment of the mid-frequency cavity 100 and the low-frequency cavity 101, further optimizing the sound quality performance of the audio equipment, and ensuring that a clear and full sound signal can still be output in the complex underground environment.

[0042] To further improve its overall sealing and heat dissipation performance during downhole operations, refer to Figure 2 , Figure 7 and Figure 8 As shown, the two ends of the buffer layer 12 are spaced apart from the outer shell 10, and a number of heat dissipation components 5 are provided between the inner shell 11 and the outer shell 10 corresponding to the two ends of the buffer layer 12. The heat dissipation components 5 are sleeved on the outer side of the inner shell 11 and abut against the inner wall of the outer shell 10.

[0043] When the speaker is operating, heat from the inner shell 11 exchanges with the outer shell 10 through the heat sink 5, promptly transferring the high internal heat to the external environment. This prevents excessive internal temperature from affecting the stability and lifespan of electronic components due to prolonged operation. Simultaneously, the close contact between the heat sink 5 and the inner wall of the outer shell 10 enhances the connection strength between the inner shell 11 and the outer shell 10, improving the overall structure's impact resistance and better adapting to potential vibrations and bumps in the underground environment. The heat sink 5 is preferably made of aluminum alloy with high thermal conductivity, offering excellent heat dissipation performance, lightweight characteristics, and corrosion resistance. This ensures efficient heat dissipation while preventing excessive weight gain or corrosion due to humidity or other environmental factors in the underground environment, thus guaranteeing the long-term effective operation of the heat dissipation structure.

[0044] Reference Figure 7 and Figure 8 As shown, multiple layers of heat dissipation components 5 are provided between any end of the buffer layer 12 and the outer shell 10 to increase the heat dissipation effect.

[0045] Reference Figure 7 and Figure 8 As shown, several air pipes 6 are installed between the buffer layer 12 and all heat sinks 5. The air pipes 6 are vertically fixed on the buffer layer 12 and are straight pipes with openings at both ends. Several air holes 60 are evenly opened circumferentially and axially on the air pipes 6. The air pipes 6 and air holes 60 extend to the gap between the heat sinks 5 and the outer shell 10 so as to guide the heat flow between adjacent heat sinks and avoid local overheating problems.

[0046] Reference Figure 7 and Figure 8 As shown, in the multi-layer heat sink 5, the two heat sinks 5 far from the middle are respectively provided with elastic connectors 7 between the buffer layer 12 and the outer shell 10, and the two heat sinks 5 are slidably limited on the air pipe 6.

[0047] When in use, when the shell 1 as a whole is driven by the vibration energy of the well, it will drive the elastic connectors 7 at both ends of the buffer layer 12 to be relatively deformed by the vibration energy (that is, the elastic connector 7 at one end is stretched and the elastic connector 7 at the other end is compressed). The elastic connector 7 at any end of the buffer layer 12 connected to the two outer heat sinks 5 will also be driven to deform accordingly. At this time, the outer heat sink 5 connected to the elastic connector 7 will slide along the axial direction of the air pipe 6. Since the air pipe 6 has several air holes 60, when the outer heat sink 5 slides on the air pipe 6, it will squeeze or suck the air between the heat sink 5 and the shell 10 and between the two adjacent heat sinks 5.

[0048] For example, when several elastic connectors 7 on one end of the buffer layer 12 near the outer shell 10 are compressed, the compressed elastic connectors 7 are driven by pressure to cause the connected heat sinks 5 to slide towards the buffer layer 12. Conversely, several elastic connectors 7 on the same end of the buffer layer 12 away from the outer shell 10 will be stretched and deformed. The stretched elastic connectors 7 and the connected heat sinks 5 have a tendency to continue sliding towards the outer shell 10 due to vibration. This causes the two outer heat sinks 5 of the three heat sinks 5 at one end of the buffer layer 12 to come into contact with the middle heat sink 5, thereby compressing the air between the three adjacent heat sinks 5. The air is then forced into the air pipe 6 through the air hole 60, and the adjacent heat sinks 5 are briefly in contact with each other for a period of time, increasing the heat exchange effect.

[0049] Meanwhile, the elastic connector 7 stretched at the other end of the buffer layer 12 pulls the corresponding outer heat sink 5 away from the outer shell 10, creating a negative pressure between the heat sink 5 and the outer shell 10. This draws air out of the air pipe 6 through the vent 60, creating forced air convection at the gap between the air pipe 6, the heat sink 5, and the outer shell 10. The flowing air can more quickly carry away the heat transferred from the inner shell 11 by the heat sink 5, significantly enhancing the heat dissipation effect and effectively solving the problem of low natural heat dissipation efficiency in the underground confined environment. Conversely, several elastic connectors 7 near the buffer layer 12 at the same end are compressed, causing the connected heat sink 5 to slide away from the buffer layer 12. This also causes the three heat sinks 5 at this end of the buffer layer 12 to come into contact with each other, compressing the air between the three heat sinks 5. This air is then forced into the air pipe 6 through the vent 60, while adjacent heat sinks 5 come into brief contact with each other for a period of time, increasing the heat exchange effect.

[0050] Furthermore, the air duct 6 not only provides a channel for airflow between the inner shell 11 and the outer shell 10, but it also contacts several heat dissipation components 5 and the buffer layer 12, which can assist in the transfer of some heat and further improve the overall heat exchange efficiency. The sliding of the heat dissipation components 5 on the air duct 6 and the elastic resistance of the elastic connector 7 ensure that the vibration energy can be stably converted into the power of air convection, thus guaranteeing the reliability and stability of the heat dissipation structure under long-term vibration environment.

[0051] Reference Figure 7 and Figure 8 As shown, the buffer layer 12 is preferably made of polyurethane elastic material and is made by high-temperature vulcanization process. Its thickness is 4mm and it has good elasticity and buffering performance. On the one hand, it can absorb the vibration energy generated by the speaker unit 3 inside the shell 1 when it is working, and avoid the shell 1 from generating additional noise due to resonance. On the other hand, it can effectively block the damage caused by dust, moisture and impact in the external environment to the internal sound cavity and speaker unit 3, and improve the durability of the mining audio in the humid, dusty and impact-prone environment underground.

[0052] The inner shell 11 is preferably made of aluminum alloy and is formed by die casting to create an inner aluminum alloy skeleton. The material is 7071 aluminum alloy with a thickness of 2mm. Its surface is anodized to form a dense oxide film, which not only improves the corrosion resistance and wear resistance of the inner shell 11, enabling it to adapt to the harsh environment of underground mining, which is humid, dusty, and may contain corrosive gases, but also enhances the structural strength of the shell 1, ensuring that it is not easily deformed when subjected to slight impacts or pressure, thereby protecting the internal speaker unit 3 and sound cavity structure from damage.

[0053] The outer shell 10 is preferably made of stainless steel. 304 stainless steel is welded by argon arc welding process. The thickness of stainless steel is 1.5mm. Stainless steel itself has extremely high mechanical strength. Combined with the strong weld formed by argon arc welding process, it forms a sealed protection for the cavity and enables the outer shell 10 to withstand large external impacts that may occur downhole, such as the collision of falling tools or rocks. This provides a solid first line of protection for the inner shell 11 and the buffer layer 12.

[0054] Example 2: Refer to Figure 7 and Figure 8 As shown, based on Embodiment 1, in order to further improve the overall heat dissipation effect during downhole operations, as an optional implementation method, several air pipes 6 are all made of thin and long air pipes 6, and a heat-conducting liquid medium (such as water) is injected into the lower side of the inner shell 11 cavity, and several heat dissipation components 5 connected to the lower side of the air pipes 6 are immersed in the heat-conducting liquid medium. The amount of heat-conducting liquid medium injected is based on the standard of completely covering the heat dissipation components 5 without affecting the normal vibration of the sound cavity, for example, it is controlled to be about two-thirds of the volume at the gap between the lower side of the buffer layer 12 and the outer shell 10.

[0055] When the sound system generates heat during operation underground, the high heat inside the inner shell 11 is transferred to the buffer layer 12 and the heat sink 5 and outer shell 10 connected thereon. After absorbing the heat, the heat sink 5 quickly transfers it to the surrounding heat-conducting liquid medium, achieving a preliminary heat dissipation effect. As the downhole vibration energy drives the shell 1 to vibrate, several heat dissipation components 5 at both ends of the air pipe 6 slide relative to each other along the air pipe 6, and the distance between adjacent heat dissipation components 5 changes: when the distance between adjacent heat dissipation components 5 at the lower end of the air pipe 6 decreases, the heat dissipation component 5 exerts a squeezing effect on the heat-conducting liquid medium located thereon, forcing the heat-conducting liquid medium to enter the interior of the slender air pipe 6 through the bottom opening and several through holes of the air pipe 6, and slide upward along the inner wall of the air pipe 6; while when the distance between adjacent heat dissipation components 5 at the lower end of the air pipe 6 increases, a suction effect is formed between the adjacent heat dissipation components 5, drawing the heat-conducting liquid medium in the air pipe 6 back to the lower side of the inner shell 11 cavity. In this process, the sliding and rising and falling of the heat-conducting liquid medium in the air pipe 6 not only expands the contact area between the heat and the inner wall of the air pipe 6, but also the flowing medium can more efficiently remove the accumulated heat inside the sound cavity, effectively avoiding the problem of excessive internal temperature of the sound system caused by the closed downhole environment and poor heat dissipation conditions, and ensuring the stability and service life of the sound system under long-term continuous operation.

[0056] During operation: First, the full-range speaker receives the audio signal and starts working. The generated mid-frequency sound wave resonates in the mid-frequency cavity 100, while the low-frequency sound wave oscillates in the low-frequency cavity 101. The partition plate 2 provides acoustic isolation so that the two frequency bands of sound waves vibrate independently in their respective cavities, reducing mutual interference and improving sound clarity.

[0057] Step 2: The vibration energy in the well is transmitted to the buffer layer 12 through the outer shell 10. The buffer layer 12 absorbs part of the vibration energy. At the same time, the inner shell 11 and the outer shell 10 protect the internal components. The sealing strip, the inner silicone first seal 4 and the outer fluororubber second seal 40 work together to prevent dust and water vapor from entering the cavity and damaging the components.

[0058] Step 3: When the shell 1 is driven by downhole vibration, the elastic connectors 7 at both ends of the buffer layer 12 undergo relative deformation, which drives the outer heat sink 5 to slide along the axial direction of the air pipe 6, and generates a squeezing or suction effect on the air between the heat sinks 5 and between the heat sinks 5 and the shell 10, so that the air forms forced convection through the air holes 60 on the air pipe 6. The heat of the inner shell 11 is transferred to the flowing air through the aluminum alloy heat sink 5, and then the air dissipates the heat to the outside, achieving efficient heat dissipation and ensuring stable operation of the sound system in the complex downhole environment.

[0059] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A sound cavity structure for a mining acoustic device, comprising a shell (1), characterized in that: The housing (1) is hollow inside to form a cavity. A partition plate (2) is provided inside the cavity to divide it into a mid-frequency cavity (100) and a low-frequency cavity (101). The edge of the partition plate (2) is tightly fitted to the inner wall of the housing (1). A speaker unit (3) is installed on the housing (1) corresponding to the mid-frequency cavity (100) and the low-frequency cavity (101). A bass reflex tube is also provided through the cavity. The housing (1) includes an outer shell (10), an inner shell (11), and a buffer layer (12). The intermediate frequency cavity (100) and the low frequency cavity (101) are both located in the inner shell (11). The inner shell (11) and the outer shell (10) are assembled together by bolts. The buffer layer (12) is clamped and limited between the inner shell (11) and the outer shell (10) to form a multi-layer composite protective structure. The buffer layer (12) is spaced apart from the outer shell (10) at both ends, and a number of heat dissipation components (5) are provided between the inner shell (11) and the outer shell (10) corresponding to the two ends of the buffer layer (12). The heat dissipation components (5) are sleeved on the outer side of the inner shell (11) and abut against the inner wall of the outer shell (10). Multiple heat dissipation components (5) are provided between any end of the buffer layer (12) and the outer shell (10). A number of air pipes (6) are provided between the buffer layer (12) and all heat dissipation components (5). A number of air holes (60) are evenly provided on the air pipes (6) in the circumferential and axial directions. The air pipes (6) and air holes (60) extend to the gap between the heat dissipation component (5) and the outer shell (10). In the multi-layer heat sink (5), the two heat sinks (5) far from the middle are respectively provided with elastic connectors (7) between the buffer layer (12) and the outer shell (10), and the two heat sinks (5) slide and limit on the air pipe (6).

2. The acoustic cavity structure of a mining acoustic device according to claim 1, characterized in that: The outer casing (10) has a mounting hole corresponding to the speaker unit (3), and the speaker unit (3) is installed at the mounting hole. The inner and outer sides of the outer casing (10) are respectively provided with a first sealing element (4) and a second sealing element (40) corresponding to the mounting hole and the speaker unit (3).

3. The acoustic cavity structure of a mining audio system according to claim 2, characterized in that: The first sealing element (4) matches the diameter of the mounting hole, and the first sealing element (4) and the second sealing element (40) cooperate to achieve a double seal at the mounting hole.

4. The acoustic cavity structure of a mining audio system according to claim 1, characterized in that: The partition plate (2) has several damping holes (20), and the damping holes (20) are filled with tuning components (21).

5. The acoustic cavity structure of a mining acoustic device according to claim 1, characterized in that: The buffer layer (12) is made of polyurethane elastic material and is made by high temperature vulcanization process. The inner shell (11) is made of aluminum alloy material and is made by die casting to form an inner aluminum alloy skeleton. The outer shell (10) is made of stainless steel material and is welded by argon arc welding process.

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