An explosion-proof lamp with a transparent cover

Abstract

The application discloses a flame-proof explosion-proof lamp with a transparent cover, which is used for reinforcing protection of an explosion-proof lamp glass cover and comprises a power supply cavity, a light source cavity, a protective cover, a U-shaped glass cover, a heat dissipation and conduction plate, LED light sources and a heat dissipation back plate. The U-shaped glass cover further comprises a hot melt adhesive layer covering the inner surface of the U-shaped glass cover and a polymer protective layer covering the inner surface of the hot melt adhesive layer. The hot melt adhesive layer is uniformly embedded with a heat conduction protective wire mesh composed of metal wires. The upper end of the heat conduction protective wire mesh is connected to a ring-shaped heat conduction connecting body in the shape of a horizontal "J". A contact heating piece is arranged at the lower part of the heat dissipation and conduction plate and is in heat conduction connection with the body of the heat dissipation and conduction plate. In the assembled state, the contact heating piece is in sliding heat conduction connection with the heat conduction connecting body. The structure realizes multi-layer protection and reinforcement. The heat conduction connecting body conducts heat to the heat conduction protective wire mesh, realizes conduction of the working temperature of the LED light sources to the U-shaped glass cover and assists heat dissipation.

Description

Technical Field

[0001] This invention relates to an explosion-proof device, and more particularly to an explosion-proof lamp with a transparent cover. Background Technology

[0002] When lighting fixtures are in operation, electrical sparks are inevitably generated in the power supply lines and components. If these sparks come into contact with explosive gases, dust, or mixtures of these substances at the production or rescue site, an explosion can occur. Therefore, with the rapid development of industries such as petroleum, chemical, mining, gas stations, and military, the use of explosion-proof lights is becoming increasingly widespread. When explosion-proof lights are used for lighting, warning (audio-visual alarms), etc., a large light-emitting surface is required to expand the illumination angle; therefore, a U-shaped glass cover is commonly used as the light-emitting surface. However, while the U-shaped glass cover ensures airtightness and wide-angle light emission, it also has the following disadvantages: 1. It is brittle and easily breaks due to impacts or temperature differences, directly causing the seal to fail. 2. To ensure safety, a large glass thickness is required, but this also leads to a significant increase in weight. 3. The U-shaped glass cover accounts for a large proportion of the outer surface area of ​​the explosion-proof lamp, so the heat dissipation capacity of the base must be improved to ensure smooth heat dissipation of the explosion-proof lamp. 4. According to common sense in the field, the thermal conductivity of glass is relatively weak (and much weaker than that of a metal base), so heat dissipation of the U-shaped glass cover is not considered. Furthermore, the U-shaped glass cover is located outside the light-emitting surface of the light source and does not have heat dissipation conditions. 5. The shell of explosion-proof lamps is usually made of metal materials such as aluminum alloy. Therefore, when the lamp is in operation, the explosion-proof lamp shell, which plays a role in heat dissipation, undergoes thermal expansion and contraction, causing the adhesive gap between it and the U-shaped glass cover to increase, thereby causing the seal to break. Summary of the Invention

[0003] The main technical problem to be solved by the present invention is to provide an explosion-proof lamp with a transparent cover, which improves the reliability of the U-shaped glass cover and enhances the heat dissipation performance of the explosion-proof lamp.

[0004] To solve the above-mentioned technical problems, the present invention provides an explosion-proof lamp with a transparent cover, comprising, from top to bottom, a power supply cavity, a light source cavity, a protective cover, and a U-shaped glass cover; the light source cavity is provided with a heat dissipation and heat conduction plate, and an LED light source and a heat dissipation back plate extending into the U-shaped glass cover are provided at the lower part of the heat dissipation and heat conduction plate. The heat dissipation back plate is thermally connected to both the LED light source and the heat dissipation and heat conduction plate. The U-shaped glass cover is fixed by the limiting structure of the protective cover. The U-shaped glass cover also includes a hot melt adhesive layer covering its inner surface and a polymer protective layer connecting to the inner surface of the hot melt adhesive layer; a thermally conductive protective mesh made of metal wire is evenly embedded in the hot melt adhesive layer, and the upper end of the thermally conductive protective mesh is converged and connected to a ring-shaped heat transfer connector with a horizontal "J" shaped cross-section; a contact heat-receiving plate is provided at the lower part of the heat dissipation and heat conduction plate and is thermally connected to the heat transfer connector; in the assembled state, the contact heat-receiving plate and the heat transfer connector maintain sliding thermal contact. The U-shaped glass cover, hot melt adhesive layer, and protective layer form a sandwich structure. The heat transfer connector conducts heat to the thermally conductive protective mesh, enabling the LED light source's operating temperature to be conducted to the U-shaped glass cover, aiding in heat dissipation. The contact heat-receiving plate and the heat transfer connector slide in thermally conductive contact, facilitating assembly. Furthermore, under thermal expansion and contraction, the contact surface automatically adjusts to increase or decrease heat conduction to the U-shaped glass cover. The thermally conductive protective mesh, while aiding in heat dissipation, combined with the adhesive force of the hot melt adhesive layer, acts as a shock absorber when the U-shaped glass cover is impacted, significantly reducing the probability of breakage. Even if breakage occurs, the tensile force of the hot melt adhesive layer minimizes crack propagation. Additionally, the heat generated by the thermally conductive protective mesh softens the hot melt adhesive layer, allowing it to slowly penetrate into cracks in the U-shaped glass cover, providing temporary repair or sealing. This design provides double reinforcement for the sealing effect of the U-shaped glass cover through the protective layer and the hot melt adhesive layer. In application, the glass thickness of the U-shaped glass cover can be significantly reduced, improving structural reliability. Reduce the temperature difference between the U-shaped glass cover and the explosion-proof lamp housing to improve the reliability of the sealed structure.

[0005] In practice, at room temperature, the contact width between the heat-receiving contact sheet and the heat transfer connector is 1 / 2 to 1 / 3 of the width of the heat-receiving contact sheet itself. When thermally expanded, the expansion directions of the heat-receiving contact sheet and the heat transfer connector are opposite, thereby increasing the contact width between them. Thus, when the working heat of the LED light source can be quickly dissipated through the heat dissipation plate and the light source cavity, less heat is conducted to the thermally conductive protective mesh due to the small contact surface. When the working heat of the LED light source cannot be quickly dissipated through the heat dissipation plate, the heat accumulates at the heat dissipation plate and the heat-receiving contact sheet, causing the structure to expand due to heat. The contact surface between the heat-receiving contact sheet and the heat transfer connector increases, and more heat is conducted to the thermally conductive protective mesh for auxiliary heat dissipation through the outer surface of the U-shaped glass cover.

[0006] In implementation, the heat transfer connector has a horizontal "J" shaped cross-section, including a parallel upper and lower end face. The upper end face contacts the bottom surface of the heat-receiving contact plate, and the lower end face shields the upper edge of the hot melt adhesive layer and is connected to the protective mesh. This structure ensures stable positioning of the heat transfer connector while sealing the edge of the hot melt adhesive layer.

[0007] In implementation, a connecting part is provided between the structural components containing the parallel upper and lower end faces, linking them together as one unit. From a top view, the heat transfer connector is annular, and a fractured band penetrating the upper end face and the connecting part is provided on its ring at intervals of 30-90 degrees. The fractured band reduces the restrictive force of the annular structure on local deformation, improving the thermal expansion and contraction effect of the upper end face.

[0008] In implementation, viewed from above, the outer edge of the heat transfer connector is located at 1 / 2 to 1 / 3 of the thickness of the upper surface of the U-shaped glass cover; a sealing ring is provided at the contact point between the heat dissipation plate and the upper surface of the U-shaped glass cover; even under thermal expansion and contraction, a gap of not less than 1 mm is maintained between the outer edge of the heat transfer connector and between the connector and the heat dissipation plate. This structure ensures that the heat transfer connector is located within the sealed structure of the heat dissipation plate and the U-shaped glass cover, and that the heat transfer connector only exchanges heat with the contact heat-receiving plate, without being interfered with by the heat dissipation plate.

[0009] In practice, the hot melt adhesive layer is made of EVA hot melt adhesive with a softening point of 60-90 degrees Celsius; the polymer protective layer is made of a polymer material with a transparency greater than 75% and a melting point higher than 200 degrees Celsius. Within the operating temperature range of the explosion-proof lamp, the polymer protective layer exhibits good stability, providing support for the hot melt adhesive layer. The hot melt adhesive layer softens when heated, acting as a Newtonian fluid buffer and repairing gaps.

[0010] In implementation, the polymer protective layer is made of polycarbonate; the hot melt adhesive layer is formed by embedding a thermally conductive protective mesh into a glass cover, and then spraying hot melt adhesive onto the mesh at a constant temperature of 80-90 degrees Celsius; the protective layer is formed by spraying hot melt adhesive onto the mesh after it has stabilized, while the mesh is continuously cooled and kept at a constant temperature of 2-15 degrees Celsius; the thickness of the hot melt adhesive layer is 1.5-5 times the thickness of the thermally conductive protective mesh, and the thickness of the protective layer is 2-7 millimeters. This solution ensures structural reliability and ease of processing.

[0011] In implementation, the thermally conductive protective mesh consists of longitudinally equidistantly distributed longitudinal wires and diffuser wires arranged in a sinusoidal wave structure along the direction of each longitudinal wire. The longitudinal wires and diffuser wires are fixedly connected as a whole. This structure ensures longitudinal strength and rapid heat conduction, transverse structural reinforcement and efficient transverse heat radiation, and high coverage of direct heat transfer between every two longitudinal wires.

[0012] In practice, the diffusion wires on each pair of adjacent longitudinal wires are nested together at the crests and troughs of the sinusoidal wave structure to form an intersection. This structure creates a unified mesh structure that is stable and reliable under thermal expansion and contraction, minimizes disturbance to the hot melt adhesive layer, and effectively buffers the thermally conductive protective mesh from impact without causing damage, thus maintaining the airtightness of the explosion-proof lamp.

[0013] In implementation, the present invention can be used in an audible and visual alarm, with the corresponding hot melt adhesive layer set as a red adhesive layer and the inner surface of the polymer protective layer being frosted to diffuse light. This structure greatly simplifies the structure of existing audible and visual alarms, reduces costs, and increases reliability.

[0014] The beneficial effects of this invention are as follows: An explosion-proof lamp with a transparent cover includes a power supply cavity, a light source cavity, a protective cover, and a U-shaped glass cover arranged from top to bottom; the light source cavity is provided with a heat dissipation and heat conduction plate inside, and an LED light source and a heat dissipation back plate extending into the U-shaped glass cover are provided at the lower part of the heat dissipation and heat conduction plate. The heat dissipation back plate is thermally connected to both the LED light source and the heat dissipation and heat conduction plate. The U-shaped glass cover is fixed by the limiting structure of the protective cover; the U-shaped glass cover also includes a hot melt adhesive layer covering its inner surface and a polymer protective layer connecting to the inner surface of the hot melt adhesive layer; a thermally conductive protective mesh made of metal wire is evenly embedded in the hot melt adhesive layer, and the upper end of the thermally conductive protective mesh is gathered and connected to a ring-shaped heat transfer connector with a horizontal "J" shaped cross section; a contact heat-receiving plate is provided at the lower part of the heat dissipation and heat conduction plate and is thermally connected to its body; in the assembled state, the contact heat-receiving plate and the heat transfer connector maintain sliding thermal contact. The U-shaped glass cover, hot melt adhesive layer, and protective layer form a sandwich structure, achieving a multi-layered protective reinforcement structure. The heat transfer connector conducts heat to the heat-conducting protective mesh, enabling the LED light source's operating temperature to be conducted to the U-shaped glass cover, aiding in heat dissipation. The contact heat-receiving plate and the heat transfer connector slide in thermally conductive contact, facilitating assembly and automatically adjusting the contact surface to increase or decrease heat conduction to the U-shaped glass cover under thermal expansion and contraction, automatically regulating the heat dissipation of the U-shaped glass cover. While the heat-conducting protective mesh assists in heat dissipation, combined with the adhesive force of the hot melt adhesive layer, it also acts as a collision buffer when the U-shaped glass cover is impacted, significantly reducing the probability of glass breakage. Even if it breaks, the heat is absorbed by the hot melt adhesive layer. Under the action of force, the crack propagation is minimized as much as possible. Furthermore, the heat generated by the thermally conductive protective mesh softens the hot melt adhesive layer, allowing it to slowly penetrate into the cracks in the U-shaped glass cover, providing temporary repair or sealing. Even if the glass layer is completely shattered, the hot melt adhesive layer embedded with the thermally conductive protective mesh and the protective layer still provide buffering and double protection, preventing damage to the explosion-proof lamp's sealed structure. This solution provides double reinforcement to the sealing effect of the U-shaped glass cover through the protective layer and the hot melt adhesive layer. In application, this significantly reduces the thickness of the U-shaped glass cover, improves structural reliability, and reduces product weight and production costs. It also reduces the temperature difference between the U-shaped glass cover and the explosion-proof lamp housing, improving the reliability of the sealed structure. Attached Figure Description

[0015] Figure 1 This is a partial cross-sectional view of an embodiment of the present invention;

[0016] Figure 2 This is a cross-sectional view of a U-shaped glass cover according to an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the structure of the thermally conductive protective wire mesh and the heat transfer connector in one embodiment of the present invention;

[0018] Figure 4 for Figure 2 , 3 A schematic diagram of the combined structure shown;

[0019] Figure 5 for Figure 4 Top view of the heat transfer connection section;

[0020] Figure 6 for Figure 3 A magnified schematic diagram of the longitudinal and diffusion fibers in the thermally conductive protective wire mesh. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] Existing explosion-proof lighting fixtures, refer to Figure 1 As shown, the structure includes a power supply cavity 4, a light source cavity 3, a protective cover 2, and a U-shaped glass cover 1 connected from top to bottom. A cable connection sealing mechanism 5 (composed of a clamping nut, a compression washer, etc.) is installed on the power supply cavity 4. A wiring terminal 14 and an LED driver power supply are installed inside the power supply cavity 4. A heat dissipation structure is installed outside the light source cavity 3. A heat dissipation plate 9 is installed inside the light source cavity 3. An LED light source 12 extending to the middle of the U-shaped glass cover 1 is installed below the heat dissipation plate 9. The LED light source 12 has a heat dissipation backplate 13, which connects and transfers the working heat of the LED light source 12 to the heat dissipation plate 9, which then conducts the heat to the outside of the light source cavity 3 for heat dissipation. The U-shaped glass cover 1 is secured below the light source cavity 3 by the limiting structure of the protective cover 2. To ensure the airtightness of the structure, a large number of sealing rings, gaskets, and sealants are used in the assembly and contact structures of the various components of the explosion-proof lamp. For example, the contact area between the U-shaped glass cover 1 and the protective cover 2 will be filled with sealant to ensure airtightness. In some cases, to further ensure positioning stability and improve protection, a positioning reinforcement strip 15 extending and enveloping the periphery of the U-shaped glass cover 1 will be provided on the outside of the protective cover 2.

[0023] For explosion-proof warning lights (audio-visual alarms), a red U-shaped lampshade is nested inside the U-shaped glass cover to convert the LED white light into red light. Some also require a diffuser inside the red U-shaped lampshade to disperse the light. Therefore, the mechanism is more complex and the size needs to be larger. The cable connection sealing mechanism of most warning lights is located on the side of the power supply cavity.

[0024] like Figure 1-4As shown, the key features of the explosion-proof lamp with a transparent cover of the present invention are as follows: the U-shaped glass cover 1 further includes a hot melt adhesive layer 6 covering its inner surface and a polymer protective layer 7 connecting the inner surface of the hot melt adhesive layer 6; a thermally conductive protective mesh 8 made of metal wire is evenly embedded in the hot melt adhesive layer 6, and the upper end of the thermally conductive protective mesh 8 is connected to a ring-shaped heat transfer connector 11 with a cross-section of an inverted "J" shape; a contact heat-receiving plate 10 is provided at the lower part of the heat dissipation and heat conduction plate 9 and is thermally connected to its body; in the assembled state, the contact heat-receiving plate 10 and the heat transfer connector 11 maintain sliding thermal contact. The U-shaped glass cover 1, hot melt adhesive layer 6, and protective layer 7 form a sandwich structure, achieving a multi-layered protective reinforcement structure. The heat transfer connector 11 conducts heat to the heat-conducting protective mesh 8, enabling the LED light source 12's operating temperature to be conducted to the U-shaped glass cover 1, aiding in heat dissipation. The contact heat-receiving plate 10 slides in heat-conducting contact with the heat transfer connector 11, facilitating assembly. Under thermal expansion and contraction, it automatically adjusts the contact surface to increase or decrease heat conduction to the U-shaped glass cover 1, automatically distributing the heat dissipation of the U-shaped glass cover 1. The heat-conducting protective mesh 8, while aiding in heat dissipation, combined with the adhesive force of the hot melt adhesive layer, provides a collision buffer when the U-shaped glass cover is impacted, significantly reducing the probability of glass breakage. Even if it breaks, the tensile force of the hot melt adhesive layer 6 helps to prevent further breakage. This design effectively reduces crack propagation. Furthermore, the heat generated by the thermally conductive protective mesh 8 softens the hot melt adhesive layer 6, allowing the hot melt adhesive to slowly penetrate into the cracks in the U-shaped glass cover 1, providing temporary repair or sealing. Even if the glass layer is completely shattered, the hot melt adhesive layer 8 with the embedded thermally conductive protective mesh 8 and the protective layer 7 still provide buffering and double protection, preventing damage to the explosion-proof lamp's sealed structure. The protective layer 7 and the hot melt adhesive layer 8 in this design provide double reinforcement for the sealing effect of the U-shaped glass cover 1. In application, this significantly reduces the glass thickness of the U-shaped glass cover 1, improves structural reliability, and reduces product weight and production costs. It also reduces the temperature difference between the U-shaped glass cover 1 and the explosion-proof lamp housing, improving the reliability of the sealed structure and preventing sealant failure due to temperature differences.

[0025] Reference Figure 1 Figure 3As shown, preferably, at room temperature, the contact width between the heat-receiving contact plate 10 and the heat transfer connector 11 is 1 / 2 to 1 / 3 of the width of the heat-receiving contact plate 10 itself. When heated and expanding, the expansion directions of the heat-receiving contact plate 10 and the heat transfer connector 11 are opposite, thereby increasing the contact width between them. In this way, when the working heat of the LED light source 12 can be quickly dissipated through the heat dissipation plate 9 and the light source cavity 2 (external heat dissipation structure), the heat conducted to the thermally conductive protective mesh 8 is less due to the small contact surface, and there is no need for the U-shaped glass cover 1 to dissipate heat. When the working heat of the LED light source cannot be quickly dissipated through the heat dissipation plate 9, the heat accumulation temperature at the heat dissipation plate 9 and the heat-receiving contact plate 10 rises, and the structure expands due to heat. Both the heat-receiving contact plate 9 and the heat transfer connector 11 expand, increasing the contact surface, and more heat is conducted to the thermally conductive protective mesh 8 for auxiliary heat dissipation through the outer surface of the U-shaped glass cover 1. At the same time, under the slight thermal expansion of the thermally conductive protective wire mesh 8, the hot melt adhesive layer 8 slightly squeezes the U-shaped glass cover 1, and the U-shaped glass cover 1 has cracks, and the hot melt adhesive layer 8 will seep in to fill them.

[0026] In one embodiment, such as Figure 1 , 3 As shown in Figure 4, the heat transfer connector 11, with a horizontal "J"-shaped cross-section, includes a parallel upper end face 11-3 and a lower end face. The upper end face contacts the bottom surface of the heat-receiving contact plate 10, and the lower end face shields the upper edge of the hot melt adhesive layer 6 and connects to the protective mesh 8. This structure ensures the stable positioning of the heat transfer connector and the effective fixing and aggregation of all edges of the heat-conducting protective mesh 8, while simultaneously sealing the edges of the hot melt adhesive layer to improve structural reliability. The upper end face contacts the bottom surface of the heat-receiving contact plate 10, achieving heat transfer while ensuring that the contact area changes due to thermal expansion and contraction, thereby regulating the conducted heat.

[0027] When implementing, refer to Figure 3 , Figure 5 As shown, a connecting part 11-2 is provided between the parallel upper end face 11-3 and the lower end face of the structural component, connecting them into one unit. This ensures effective heat transfer, and the connecting part 11-2 has a certain elasticity to ensure effective contact between the upper end face 11-3 and the heat-receiving plate 10. From a top view, refer to... Figure 5 The heat transfer connector 11 is annular, and a fractured band 11-4 with a fracture structure is provided on its ring at intervals of 30-90 degrees, penetrating the upper end face 11-3 and the connecting part 11-2. The fractured band reduces the limiting force of the annular structure on local deformation, improves the thermal expansion and contraction effect of the upper end face, and reduces the requirements for product structural tolerances. Figure 5The embodiment shown has four break marks 11-4 on its ring body, each at 90-degree intervals, penetrating the upper end face 11-3 and the connecting part 11-2.

[0028] When implementing, refer to Figure 4 From a top view, the outer edge of the heat transfer connector 11 is located at 1 / 2 to 1 / 3 of the thickness of the upper surface of the U-shaped glass cover 1; a sealing ring is provided at the contact point between the heat dissipation and heat conduction plate 9 and the upper surface of the U-shaped glass cover 1; even under thermal expansion and contraction, a gap of not less than 1 mm is maintained between the outer edge of the heat transfer connector 11 and between the connector 11-2 and the heat dissipation and heat conduction plate 9. This structure ensures that the heat transfer connector 11 is located within the sealed structure of the heat dissipation and heat conduction plate 9 and the U-shaped glass cover 1, and that the heat transfer connector 11 only exchanges heat with the contact heat-receiving plate 10, without being disturbed by the heat dissipation and heat conduction plate 9, thus ensuring the reliability of the function of regulating heat transfer through thermal expansion and contraction.

[0029] Reference Figure 3 , 5 As shown, the contact area between the heat transfer connector 11 and the heat-receiving plate 10 is not only due to thermal expansion and contraction. When the U-shaped glass cover 1 is subjected to a strong impact and breaks, the heat transfer connector 11 will inevitably deform inward. At this time, the contact area between the heat transfer connector 11 and the heat-receiving plate 10 increases significantly. During heat dissipation, more heat will be obtained here, making it easier for the hot melt adhesive layer 6 to soften, thereby achieving the repair and filling of the cracks in the U-shaped glass cover 1. The setting of the fracture zone 11-4 ensures that the different areas of the heat transfer connector 11 do not affect each other, and the upper end surface 11-3 remains as horizontal as possible after deformation.

[0030] In practice, preferably, the hot melt adhesive layer 6 is made of EVA hot melt adhesive material with a softening point of 60-90 degrees Celsius, which is more compatible with the operating temperature of the LED light source inside the explosion-proof lamp; the polymer protective layer 7 is a polymer material with a transparency greater than 75% and a melting point higher than 200 degrees Celsius; while ensuring transparency, this layer also ensures the stability of the structure, providing effective support and buffering for the hot melt adhesive layer 6. When the hot melt adhesive layer 6 softens, it is easier to perform Newtonian fluid buffering and gap flow repair functions, and it is also more conducive to heat exchange and heat dissipation.

[0031] During implementation, the preferred method is to refer to... Figure 2-4As shown, the polymer protective layer 7 is made of polycarbonate, which has a high melting point, high transparency, good toughness, is not easy to break, and is lightweight. The hot melt adhesive layer 6 is formed by embedding the thermally conductive protective mesh 8 into the glass cover, and then spraying the thermally conductive protective mesh 8 at a constant temperature of 80-90 degrees Celsius with hot melt adhesive. This ensures that the hot melt adhesive fully covers and adheres to the thermally conductive protective mesh 8, reducing air bubbles and gaps, and the processing is fast and the hot melt adhesive thickness is uniform. The protective layer 7 is formed by spraying the thermally conductive protective mesh 8 at a constant temperature of 2-15 degrees Celsius after the hot melt adhesive layer 6 has been stabilized. This structure and method ensure that there are no air bubbles or gaps between the protective layer 7 and the hot melt adhesive layer 6, ensuring the high light transmittance of the final three-layer composite structure, and avoiding the loss of hot melt adhesive layer 6 due to heat during processing. If necessary, the inner wall of the protective layer 7 can be smoothed to improve the light transmittance. The thickness of the hot melt adhesive layer 6 is 1.5-5 times the thickness of the thermally conductive protective wire mesh 8, and the thickness of the protective layer 7 is 2-7 mm; this thickness setting ensures that each layer can fully play its role and improves reliability.

[0032] When implementing, such as Figure 3 Figure 6 As shown, the thermally conductive protective mesh 8 consists of longitudinally equidistantly distributed longitudinal wires 8-1 and diffuser wires 8-2 arranged in a sinusoidal wave structure along the direction of each longitudinal wire 8-1. The longitudinal wires 8-1 and diffuser wires 8-2 are fixedly connected as a whole. This structure ensures longitudinal strength and rapid heat conduction, transverse structural reinforcement and efficient transverse heat radiation, and high coverage of direct heat transfer between every two longitudinal wires. The structure minimizes light obstruction while ensuring efficient temperature transfer and coverage.

[0033] During implementation, the preferred method is, for example... Figure 3 , 6 As shown, the diffuser wires 8-2 on each pair of adjacent longitudinal wires 8-1 are nested together at the crests and troughs of the sinusoidal structure to form a junction 8-3. This structure creates an integrated mesh structure with nested diffuser wires 8-2. This ensures the thermally conductive protective mesh 8 remains structurally stable and reliable under thermal expansion and contraction. The junction 8-3 guarantees adequate expansion and contraction allowance, minimizing disturbance to the hot melt adhesive layer and reducing damage during processing. When the thermally conductive protective mesh 8 is subjected to impact, the diffuser wires 8-2 provide effective cushioning and prevent damage to the mesh, maintaining the airtightness of the explosion-proof lamp. The junction 8-3 provides a fitting allowance between the diffuser wires 8-2. Combined with the sinusoidal structure, even when the diffuser wires 8-2 are straightened, there is still some allowance. Combined with the viscosity / flowability of the hot melt adhesive layer 6, the fine metal wires exhibit excellent toughness, rapid heat conduction, and effective protection, making it difficult for the thermally conductive protective mesh 8 to break during processing and use.

[0034] The aforementioned embodiments can all be used in existing conventional explosion-proof lighting fixtures. When applying this invention to an explosion-proof warning light (audible and visual alarm), based on the aforementioned explosion-proof light scheme with a transparent cover, the hot melt adhesive layer 6 is set as a red adhesive layer, and the inner surface of the polymer protective layer 7 is frosted (which can be formed through high-particle spraying). Thus, the polymer protective layer 7 achieves light diffusion, and the hot melt adhesive layer 6 converts white light into red warning light. The hot melt adhesive layer 6, the protective layer 7, and the U-shaped glass cover 1 are tightly bonded, improving the light output rate and allowing for a smaller lamp body, greatly simplifying the structure of existing audible and visual alarms. Furthermore, the U-shaped glass cover 1 is effectively strengthened, reducing its thickness, decreasing material usage, lowering product quality, and effectively reducing costs while ensuring reliability.

[0035] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. An explosion-proof lamp with a transparent cover, comprising, from top to bottom, a power supply cavity (4), a light source cavity (3), a protective cover (2), and a U-shaped glass cover (1); the light source cavity (3) is provided with a heat dissipation and heat conduction plate (9), and the lower part of the heat dissipation and heat conduction plate (9) is provided with an LED light source (12) extending into the U-shaped glass cover (1) and a heat dissipation back plate (13), the heat dissipation back plate (13) being thermally connected to both the LED light source (12) and the heat dissipation and heat conduction plate (9), the U-shaped glass cover (1) being fixed by a limiting structure of the protective cover (2), characterized in that, The U-shaped glass cover (1) further includes a hot melt adhesive layer (6) covering its inner surface and a polymer protective layer (7) connecting the inner surface of the hot melt adhesive layer (6); a thermally conductive protective mesh (8) made of metal wire is evenly embedded in the hot melt adhesive layer (6), and the upper end of the thermally conductive protective mesh (8) is connected to a ring-shaped heat transfer connector (11) with a cross-section of an inverted "J" shape; a contact heat-receiving plate (10) is provided at the lower part of the heat dissipation and heat conduction plate (9) and is thermally connected to its body; in the assembled state, the contact heat-receiving plate (10) 10) Maintaining sliding thermal contact with the heat transfer connector (11); the heat transfer connector (11) with a horizontal "J" shaped cross section includes an upper end face (11-3) and a lower end face that are parallel to each other. The upper end face is in contact with the bottom surface of the contact heat receiving plate (10), and the lower end face shields the upper edge of the hot melt adhesive layer (6) and is connected to the thermally conductive protective mesh (8); the thermally conductive protective mesh (8) consists of longitudinally equidistantly distributed longitudinal wires (8-1) and a diffusion structure with a sinusoidal wave shape along the direction of each longitudinal wire (8-1). The structure is composed of filaments (8-2), with the longitudinal filaments (8-1) and diffuser filaments (8-2) fixedly connected as a whole; the diffuser filaments (8-2) on each of two adjacent longitudinal filaments (8-1) are nested together at the crests and troughs of the sinusoidal wave structure to form a junction (8-3); a connecting part (11-2) is provided between the structural components containing the parallel upper and lower end faces to connect them as a whole; from a top view, the heat transfer connector (11) is annular, and a filament is provided on its ring at intervals of 30-90 degrees. A fractured band (11-4) with a fractured structure penetrates the upper end face (11-3) and the connecting part (11-2); from a top view, the outer edge of the heat transfer connector (11) is located at 1 / 2 to 1 / 3 of the thickness of the upper end face of the U-shaped glass cover (1); a sealing ring is provided at the contact point between the heat dissipation plate (9) and the upper end face of the U-shaped glass cover (1); the outer edge of the heat transfer connector (11) and the connecting part (11-2) and the heat dissipation plate (9) still maintain a gap of not less than 1 mm even under thermal expansion and contraction.

2. The explosion-proof lamp with a transparent cover as described in claim 1, characterized in that, At room temperature, the contact width between the heat-receiving plate (10) and the heat transfer connector (11) is 1 / 2 to 1 / 3 of the width of the heat-receiving plate (10) itself; when heated and expanded, the expansion directions of the heat-receiving plate (10) and the heat transfer connector (11) are opposite to each other, so as to drive the contact width between the two to increase.

3. The explosion-proof lamp with a transparent cover as described in claim 1, characterized in that, The hot melt adhesive layer (6) is made of EVA hot melt adhesive material with a softening point of 60-90 degrees; the polymer protective layer (7) is made of polymer material with a transparency of more than 75% and a melting point of more than 200 degrees.

4. The explosion-proof lamp with a transparent cover as described in claim 3, characterized in that, The polymer protective layer (7) is made of polycarbonate; the hot melt adhesive layer (6) is formed by embedding the thermally conductive protective mesh (8) into the glass cover and then spraying the thermally conductive protective mesh (8) at a constant temperature of 80-90 degrees Celsius; the polymer protective layer (7) is formed by spraying the thermally conductive protective mesh (8) at a constant temperature of 2-15 degrees Celsius after the hot melt adhesive layer (6) is stabilized; the thickness of the hot melt adhesive layer (6) is 1.5-5 times the thickness of the thermally conductive protective mesh (8), and the thickness of the polymer protective layer (7) is 2-7 mm.

5. An explosion-proof lamp with a transparent cover, characterized in that, The invention includes an explosion-proof lamp with a transparent cover as described in any one of claims 1 to 4, wherein the hot melt adhesive layer (6) is a red adhesive layer and the inner surface of the polymer protective layer (7) is a frosted surface.

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