Explosion-proof loudspeaker

Abstract

An explosion-proof loudspeaker comprises a main shell and a loudspeaker, and further comprises a loudspeaker front housing fixedly covering the main shell, the edge portion of the loudspeaker is fixedly clamped between the main shell and the loudspeaker front housing, the loudspeaker front housing is provided with a sound transmission window directly facing a loudspeaker opening of the loudspeaker, and the loudspeaker front housing is provided with a sound receiving window directly facing the loudspeaker opening of the loudspeaker. The loudspeaker front housing is internally provided with a sound transmission window, the loudspeaker front housing is internally provided with a sintering sheet covering the inner side of the sound transmission window, and the edge part of the sintering sheet is connected with the inner wall of the loudspeaker front housing through a circle of pouring sealing layer in a pouring sealing mode. According to the explosion-proof loudspeaker, the holes of the sintered sheets can allow sound of the loudspeaker to pass through, meanwhile, the holes among the sintered particles reduce the flame propagation speed, the effect that electric sparks or electric arcs are generated in the explosion-proof loudspeaker until the electric sparks are weakened until the electric sparks are extinguished is achieved, the explosion-proof purpose is achieved, the explosion-proof performance is high, safety is high, and the explosion-proof loudspeaker is suitable for high-power explosion-proof loudspeakers.

Description

Technical Field

[0001] The utility model belongs to the field of explosion protection, and particularly relates to an explosion-proof loudspeaker. Background Art

[0002] Electrical equipment used in some gas-explosive, dust and fiber-explosive environments (such as coal mines, petrochemical industries, gas stations, natural gas extraction, drilling platforms, military industries, mines, metal polishing workshops with explosion hazards, etc.) needs to be designed for explosion protection. Otherwise, electrical ignition sources such as electric sparks and arcs accidentally generated during equipment operation will cause explosions and lead to safety accidents.

[0003] Since the horn mouth of the explosion-proof loudspeaker needs to transmit sound outward, the housing at the horn mouth cannot be made into a closed housing isolated from the atmosphere. Therefore, the existing explosion-proof loudspeakers adopt intrinsically safe explosion-proof horns. The principle is to limit the energy of electric sparks or thermal effects that may be generated by the connecting wires of the horn to a level that cannot ignite the explosive environment, so as to achieve the explosion-proof effect. However, this type of intrinsically safe explosion-proof loudspeaker has a small power and cannot be applied to high-power explosion-proof loudspeakers.

[0004] Therefore, it is a market demand to design an explosion-proof loudspeaker that can output a relatively large sound and can be used in explosion-proof places. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide an explosion-proof loudspeaker.

[0006] To solve the above technical problem, the technical solution adopted by the utility model is: an explosion-proof loudspeaker, including a main housing and a horn, further including a front horn cover fixed and provided on the main housing. The edge of the horn is fixedly clamped between the main housing and the front horn cover. The front horn cover has a sound transmission window facing the horn mouth of the horn. The front horn cover further has a sintered sheet covering the inner side of the sound transmission window. The edge of the sintered sheet is sealed and connected with the inner wall of the front horn cover through a ring of potting layer. By arranging a sintered sheet between the sound transmission window of the front horn cover and the horn, the pores of the sintered sheet itself can allow the sound of the horn to pass through. At the same time, the pores between the sintered particles can reduce the flame propagation speed, achieving the effect of weakening and even extinguishing the electric sparks or arcs generated inside the explosion-proof loudspeaker, so as to achieve the purpose of explosion protection. It has strong explosion-proof performance, high safety, and is applicable to high-power explosion-proof loudspeakers.

[0007] In some embodiments, the sintered sheet is a stainless steel sintered sheet, and its pores are 0.05 - 0.15 mm.

[0008] In some embodiments, the thickness of the sintered sheet is 4 - 6 mm.

[0009] In some embodiments, the front cover of the horn is screwed onto the main housing through explosion-proof threads, and a sealing ring is provided between the front cover of the horn and the main housing.

[0010] In some embodiments, a pressing ring is tightly fitted between the peripheral part of the sintered sheet and the outer edge part of the horn.

[0011] In some embodiments, the main housing includes a main housing support layer, a main housing front ring extending from the main housing support layer to one side, and a main housing cylinder extending from the main housing support layer to the other side. After the main housing front ring is assembled and connected with the front cover of the horn, a horn assembly cavity for assembling the horn is formed in the middle. The rear end of the main housing cylinder is hermetically connected with a rear cover, and an explosion-proof cavity for installing a circuit board is formed between the rear cover and the main housing cylinder.

[0012] In some embodiments, a wire channel is provided on the main housing support layer. The electric control wire between the circuit board and the horn is threaded through the wire channel, and a potting body for potting the electric control wire is filled in the wire channel.

[0013] In some embodiments, the circuit board is fixed to the main housing support layer by blind hole screws.

[0014] In some embodiments, the rear cover is provided with an explosion-proof gland for introducing a cable.

[0015] The scope of the present utility model is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features. For example, technical solutions formed by mutually replacing the above features with (but not limited to) technical features having similar functions disclosed in the present application, etc.

[0016] Due to the application of the above technical solution, the present utility model has the following advantages compared with the prior art: The present utility model provides an explosion-proof loudspeaker. By arranging a sintered sheet between the sound transmission window of the front cover of the horn and the horn, the pores of the sintered sheet itself can allow the sound of the horn to pass through. At the same time, the pores between the sintered particles can reduce the flame propagation speed, achieving the effect of weakening and even extinguishing the electric spark or electric arc generated inside the explosion-proof loudspeaker, so as to achieve the purpose of explosion-proof. It has strong explosion-proof performance, high safety, and is suitable for high-power explosion-proof loudspeakers. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the outer contour of the explosion-proof loudspeaker;

[0018] Figure 2 It is a schematic diagram of the internal sectional structure of the explosion-proof loudspeaker;

[0019] Wherein: 1. Main housing; 11. Main housing support layer; 12. Front ring of main housing; 13. Front cover of speaker; 14. Rear cover; 141. Explosion-proof gland; 2. Speaker; 3. Front cover of speaker; 3a. Sound transmission window; 4. Sintered sheet; 5. Potting layer; 6. Sealing ring; 7. Pressing ring; 8. Circuit board; 9. Potted body. Specific implementation manner

[0020] As Figure 1 , 2 shown, an explosion-proof loudspeaker includes a main housing 1, a speaker 2, and a front cover 3 of the speaker that is fixedly installed on the main housing 1 by screwing through an explosion-proof thread. A sealing ring 6 is provided between the front cover 3 of the speaker and the main housing 1.

[0021] The main housing 1 includes a main housing support layer 11, a ring-shaped front ring 12 of the main housing extending from the main housing support layer 11 to one side, and a main housing cylinder 13 extending from the main housing support layer 11 to the other side. The main housing support layer 11, the front ring 12 of the main housing, and the main housing cylinder 13 are integrally formed. The speaker 2 is fixedly clamped between the front ring 12 of the main housing and the front cover 3 of the speaker. After the main housing support layer 11, the front ring 12 of the main housing, and the front cover 3 of the speaker are assembled and connected, a speaker assembly cavity for assembling the speaker 2 is formed in the middle, that is, the speaker 2 is fixedly assembled in the speaker assembly cavity.

[0022] The front cover 3 of the speaker has a sound transmission window 3a facing the speaker opening of the speaker 2. The sound transmission window 3a can be a relatively large opening or, as in this embodiment, a mesh layer with many mesh holes.

[0023] The front cover 3 of the speaker also has a sintered sheet 4 that is disposed inside the sound transmission window 3a in a shielding and covering manner. In this embodiment, the sintered sheet 4 is a stainless steel sintered sheet with pores of 0.1 mm and a thickness of 6 mm.

[0024] After the edge of the sintered sheet 4 and the inner wall of the front cover 3 of the speaker are potted and sealed by a whole circle of L-shaped potting layer 5, the peripheral part of the sintered sheet 4 and the outer edge part of the speaker 2 are tightly fitted by a pressing ring 7. The joint length of the L-shaped potting layer 5 is ≥6 mm. The setting of the pressing ring 7 makes the position of the sintered sheet 4 more stable and keeps it sealed. The mesh-shaped sound transmission window 3a can form a rigid protective layer for the outside of the sintered sheet 4.

[0025] The rear end of the main housing cylinder 13 is hermetically connected with a rear cover 14. After a cylindrical flameproof joint surface is arranged between the rear cover 14 and the main housing cylinder 13 and matched, a flameproof cavity is formed by setting a sealing ring and fixing connection with screws. The circuit board 8 is installed in the flameproof cavity. The circuit board 8 is fixed on the main housing support layer 11 through blind hole screws. A wire channel is also opened on the main housing support layer 11. The electric control wire between the circuit board 8 and the speaker 2 is threaded through the wire channel, and a potting body 9 for potting treatment of the electric control wire is filled in the wire channel. The potting body 9 is formed by potting treatment with SY002. The length of the potting body 9 is ≥20 mm. The rear cover 14 is provided with an explosion-proof gland 141 for introducing a cable wire.

[0026] The explosion-proof speaker provided by the utility model has a simple structure. By hermetically arranging a sintered sheet 4 inside the sound transmission window 3a in front of the speaker 2, when an electric spark or arc generated in the speaker assembly cavity of the explosion-proof speaker passes through the sintered sheet 4, it will be weakened by the pores of the sintered sheet 4 itself, thereby reducing the propagation speed to extinction, ensuring the safety performance of the equipment when used in explosion-proof places, and meeting the requirements of the product standard Q / KSS 057 - 2023 "Enterprise Standard for BYS Explosion-Proof Speakers", satisfying the explosion-proof grade of Ex dbIIC T6 Gb / Ex tb IIIC T80℃ Db, with a rated voltage that can reach DC24V; the protection grade is IP66, and the rated power can reach 5W. Usually, the power of the intrinsically safe type is 2.4W; and it can be used at an ambient temperature of -40°C to +55°C.

[0027] The above embodiments are only used to illustrate the technical concept and characteristics of the utility model, and their purpose is to enable those who are familiar with this technology to understand the content of the utility model and implement it accordingly, and cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit and essence of the utility model should be covered within the protection scope of the utility model.

Claims

1. An explosion-proof loudspeaker, comprising a main housing (1) and a speaker (2), characterized in that: It further includes a speaker front cover (3) fixedly covered on the main housing (1). The speaker (2) is fixedly clamped before and after between the main housing (1) and the speaker front cover (3). The speaker front cover (3) has a sound transmission window (3a) facing the speaker opening of the speaker (2). Inside the speaker front cover (3), there is also a sintered sheet (4) covering the inner side of the sound transmission window (3a). The edge of the sintered sheet (4) and the inner wall of the speaker front cover (3) are sealed and connected by a sealing layer (5).

2. The explosion-proof speaker according to claim 1, wherein: The sintered sheet (4) is a stainless steel sintered sheet with pores of 0.05 - 0.15 mm.

3. The explosion-proof speaker according to claim 1, wherein: The thickness of the sintered sheet (4) is 4 - 6 mm.

4. The explosion-proof speaker according to claim 1, characterized in that: The speaker front cover (3) is screwed onto the main housing (1) through an explosion-proof thread, and a sealing ring (6) is provided between the speaker front cover (3) and the main housing (1).

5. The explosion-proof speaker according to claim 1, wherein: The peripheral part of the sintered sheet (4) and the outer edge part of the speaker (2) are tightly fitted by a retaining ring (7).

6. The explosion-proof loudspeaker according to claim 1, characterized in that: The main housing (1) includes a main housing support layer (11), a main housing front ring (12) extending from the main housing support layer (11) to one side, and a main housing cylinder (13) extending from the main housing support layer (11) to the other side. After the main housing front ring (12) and the speaker front cover (3) are assembled and connected, a speaker assembly cavity for assembling the speaker (2) is formed in the middle. The rear end of the main housing cylinder (13) is hermetically connected with a rear cover (14), and an explosion-proof cavity for installing a circuit board (8) is formed between the rear cover (14) and the main housing cylinder (13).

7. The explosion-proof loudspeaker according to claim 6, wherein: A wire channel is provided on the main housing support layer (11). The electrical control wire between the circuit board (8) and the speaker (2) is passed through the wire channel, and a potting body (9) for potting the electrical control wire is filled in the wire channel.

8. The explosion-proof loudspeaker according to claim 6, wherein: The circuit board (8) is fixed to the main housing support layer (11) by blind hole screws.

9. The explosion-proof loudspeaker according to claim 6, characterized in that: The rear cover (14) has an explosion-proof gland (141) for introducing a cable.

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