Fireproof capsule lamp

Abstract

The utility model relates to the technical field of building electrical fire prevention, specifically relates to a fireproof down lamp, including the shell, install the front ring of shell bottom surface, the inboard of front ring is equipped with LED light bar, the input wire material is connected to LED light bar, the shell inboard is equipped with ceramic fireproof block, graphite foamed cotton is equipped between ceramic fireproof block with shell, the ceramic fireproof block top surface is equipped with fireproof shell fragment, the fireproof shell fragment is located in the shell after compression, the shell top surface is equipped with two springs symmetrically. The utility model overcomes the defects that the fireproof down lamp heat dissipation performance and fireproof sealing performance are difficult to give attention to in the prior art, has excellent heat dissipation capacity under normal working condition, and can automatically convert into the down lamp structure of high -efficient sealing flame -retardant mode under the fire condition.

Description

Technical Field

[0001] This utility model relates to the field of building electrical fire protection technology, specifically to a fireproof downlight. Background Technology

[0002] In recent years, driven by multiple factors such as upgraded building regulations, increased structural safety requirements, and technological iterations, the demand for fire-resistant downlights in high-rise residential buildings and commercial complexes in the North American market has exploded. However, looking at the current market landscape, the industry is in a unique phase where rapid technological evolution coexists with a market rife with substandard products. The market is flooded with numerous inferior products that falsely claim fire resistance ratings and have serious defects in heat dissipation design, which not only disrupt market order but also create significant safety hazards. Utility Model Content

[0003] The purpose of this utility model is to provide a fireproof downlight to solve the above-mentioned problems and overcome the shortcomings of existing fireproof downlights in which heat dissipation performance and fireproof sealing performance are difficult to balance. The downlight structure has excellent heat dissipation capacity under normal working conditions and can automatically switch to a highly efficient sealing and flame-retardant mode under fire conditions.

[0004] To achieve the above objectives, this utility model provides the following solution:

[0005] A fireproof downlight includes a housing, a front ring mounted on the bottom surface of the housing, an LED light strip mounted on the inner side of the front ring, the LED light strip being connected to an input wire, a ceramic fireproof block disposed on the inner side of the housing, graphite foam being disposed between the ceramic fireproof block and the housing, a fireproof spring being mounted on the top surface of the ceramic fireproof block, the fireproof spring being compressed and located inside the housing, and two springs symmetrically disposed on the top surface of the housing.

[0006] Preferably, thermally conductive double-sided adhesive is attached to the outer side of the LED light strip, and the thermally conductive double-sided adhesive is attached to the inner ring of the front ring.

[0007] Preferably, a light guide plate is provided on the inner side of the LED light strip, and reflective paper and EVA are arranged sequentially from bottom to top on the light guide plate. The EVA is located on the bottom surface of the ceramic fireproof block, and a diffuser plate is attached to the bottom surface of the light guide plate.

[0008] Preferably, the fixed end of the fireproof spring is located on the ceramic fireproof block, and the fixed end of the fireproof spring is fixed on the ceramic fireproof block by a spring mounting bracket and mounting screws, while the movable end of the fireproof spring is inserted into the relief groove of the ceramic fireproof block.

[0009] Preferably, the ceramic fireproof block has a limiting groove, and the front ring has a limiting pin, with the limiting groove and the limiting pin corresponding to each other.

[0010] Preferably, the outer casing is fixedly connected to the front ring by fastening screws.

[0011] To further optimize the solution, the other end of the input cable 1 is connected to an LED power module 13.

[0012] This utility model has the following technical effects:

[0013] At room temperature, graphite foam exhibits excellent resilience and compressibility, ensuring a compact structure during lamp installation. When the temperature rises to 150℃–250℃ in a fire, the material rapidly expands, filling all gaps and forming an airtight and thermally insulating sealing layer. This expansion process is accompanied by significant heat absorption and smoke barrier properties, further enhancing the overall system's fire resistance, heat insulation, and smoke prevention performance, compensating for the shortcomings of rigid ceramic materials in sealing micro-gaps. This innovative approach combines rigid ceramic materials (high-temperature structural support) with flexible expansion materials (dynamic sealing), creating a dual fire protection mechanism of "main body sealing + edge sealing." The ceramic fireproof block bears the primary functions of high-temperature pressure bearing and hole sealing, while the graphite foam dynamically compensates for thermal deformation and fills micro-gaps. Their synergistic effect significantly improves the fire resistance reliability and durability of the downlight in real fire environments. This structure requires no external control or energy drive, and is automatically activated entirely by the intrinsic properties of the material and the thermal response mechanism, which is in line with the development direction of passive fire protection technology. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the exploded structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the combined structure of the LED light strip and the thermally conductive double-sided adhesive of this utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the LED light strip and front ring after they are assembled.

[0018] Figure 4 This is a schematic diagram showing the installation positions of EVA, reflective paper, light guide plate, and diffuser plate in this utility model.

[0019] Figure 5 This is a schematic diagram of the structure of the ceramic fireproof block and graphite foam of this utility model.

[0020] Figure 6 This is a schematic diagram of the ceramic fireproof block and the front ring mating structure of this utility model;

[0021] Figure 7 This is a schematic diagram of the structure of the spring mounting bracket for fixing the fireproof spring sheet of this utility model;

[0022] Figure 8 This is a schematic diagram showing the installation position of the mounting screws in this utility model;

[0023] Figure 9 This is a schematic diagram of the installation of the outer shell and front ring of this utility model.

[0024] Figure 10 This is a schematic diagram of the structure after the present invention is installed.

[0025] The components include: 1. Input cable; 2. Fastening screws; 3. Housing; 4. Ceramic fireproof block; 401. Limiting groove; 5. Graphite foam; 6. EVA; 7. Reflective paper; 8. Light guide plate; 9. LED light strip; 10. Thermally conductive double-sided tape; 11. Diffuser plate; 12. Front ring; 1201. Limiting pin; 13. LED power module; 14. Spring; 15. Spring mounting bracket; 16. Mounting screws; 17. Fireproof spring clips. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Reference Figures 1 to 10 As shown, this embodiment provides a fireproof downlight, including a housing 3, a front ring 12 installed on the bottom surface of the housing 3, an LED light strip 9 installed on the inner side of the front ring 12, an input wire 1 connected to the LED light strip 9, a ceramic fireproof block 4 provided on the inner side of the housing 3, a graphite foam 5 provided between the ceramic fireproof block 4 and the housing 3, a fireproof spring 17 installed on the top surface of the ceramic fireproof block 4, the fireproof spring 17 is located inside the housing 3 after compression, and two springs 14 are symmetrically provided on the top surface of the housing 3.

[0029] To address the "fire-resistant weak points" created by holes in floor slabs or ceilings for downlights, high-temperature resistant, high-strength ceramic fireproof blocks are used as the core sealing component. At room temperature, these blocks are part of the lighting fixture structure; during a fire, they soften or sinter at high temperatures to form a dense ceramic body, effectively sealing the through holes. These ceramic fireproof blocks possess high heat resistance (≥1000℃) and low thermal conductivity (referencing the technical parameters of K-series calcium silicate boards and MS-2 talc ceramic). In the 120-minute fire resistance test specified by UL 263 standard, they effectively block the transfer of flame and heat, maintaining the integrity of the building's fire compartments.

[0030] To improve sealing reliability, expandable graphite foam is used as an elastic filling material to fill the assembly gaps or thermal expansion gaps between ceramic fireproof blocks and lamp housings or building bases.

[0031] At room temperature, graphite foam exhibits excellent resilience and compressibility, ensuring a compact structure during lamp installation. When the temperature rises to 150℃–250℃ in a fire, the material rapidly expands (expansion ratio > 30 times, referencing Biyou expansion tape data), filling all gaps and forming an airtight + thermally insulating sealing layer. This expansion process is accompanied by significant heat absorption and smoke barrier properties, further enhancing the overall system's fire resistance, heat insulation, and smoke prevention performance, compensating for the shortcomings of rigid ceramic materials in sealing micro-gaps. This innovative approach combines rigid ceramic materials (high-temperature structural support) with flexible expansion materials (dynamic sealing), creating a dual fire protection mechanism of "main body sealing + edge sealing." The ceramic fireproof block bears the primary functions of high-temperature pressure bearing and hole sealing, while the graphite foam dynamically compensates for thermal deformation and fills micro-gaps. Their synergistic effect significantly improves the fire resistance reliability and durability of the downlight in real fire environments. This structure requires no external control or energy drive, and is automatically activated entirely by the intrinsic properties of the material and the thermal response mechanism, which is in line with the development direction of passive fire protection technology.

[0032] To further optimize the design, thermally conductive double-sided adhesive 10 is attached to the outer side of the LED light strip 9 and is attached to the inner ring of the front ring 12.

[0033] The thermally conductive double-sided adhesive tape 10 can promptly dissipate the heat generated during the heating process of the LED light strip 9 through the front ring 12, preventing the LED light strip 9 from overheating and being damaged.

[0034] To further optimize the design, a light guide plate 8 is provided on the inner side of the LED light strip 9. A reflective paper 7 and an EVA 6 are arranged sequentially from bottom to top on the light guide plate 8. The EVA 6 is located on the bottom surface of the ceramic fireproof block 4. A diffuser plate 11 is attached to the bottom surface of the light guide plate 8.

[0035] EVA is made of ethylene / vinyl acetate, which can insulate a certain amount of heat from being transferred to the ceramic fireproof block 4 and prevent heat from being transferred to the graphite foam 5 through the ceramic fireproof block 4. The setting of the light guide plate 8 and the reflective paper 7 can enhance the illumination brightness of the LED light strip 9.

[0036] The design is further optimized so that the fixed end of the fireproof spring 17 is located on the ceramic fireproof block 4. The fixed end of the fireproof spring 17 is fixed on the ceramic fireproof block 4 by the spring mounting bracket 15 and the mounting screw 16. The movable end of the fireproof spring 17 is inserted into the relief groove of the ceramic fireproof block 4.

[0037] Fireproof shrapnel 17 is designed as a high-temperature shrapnel.

[0038] The technical problem of light fixture detachment and fireproof structure failure due to material degradation (such as softening, loss of elasticity, and oxidation fracture) in traditional metal spring-type installation mechanisms, thereby compromising the integrity of building fire compartments, is addressed here. To solve this problem, an integrated installation support structure is proposed, using ceramic fireproof blocks as the load-bearing substrate and featuring a dual protection mechanism of "normal temperature spring installation + high temperature spring emergency support."

[0039] Using ceramic fireproof blocks as the structural support platform, stable support is achieved in high-temperature environments. All installation support structures of the lighting fixture (including spring mounting brackets, fireproof springs, fasteners, etc.) are integrated onto the ceramic fireproof blocks. This makes the ceramic fireproof blocks not only the main fireproof sealing body, but also the core load-bearing and positioning reference structure of the entire lighting fixture under high temperatures. Utilizing the excellent high-temperature strength and dimensional stability of ceramic materials, it is ensured that the support structure can maintain its geometric shape and mechanical strength under prolonged high-temperature combustion conditions, avoiding support failure due to substrate deformation.

[0040] The design is further optimized by creating a limiting groove 401 on the ceramic fireproof block 4 and a limiting pin 1201 on the front ring 12, with the limiting groove 401 and the limiting pin 1201 corresponding to each other.

[0041] The design was further optimized so that the outer casing 3 was fixedly connected to the front ring 12 by fastening screws 2.

[0042] To further optimize the solution, the other end of the input cable 1 is connected to an LED power module 13.

[0043] This utility model incorporates three layers of protection. The first layer of protection is a conventional spring mounting system: during normal temperature installation, the springs and spring mounting brackets work together to quickly press and fix the light fixture in the ceiling. This system is easy to operate, highly adaptable, and meets the installation needs of ceilings of varying thicknesses. The spring system also has excellent preload adjustment capabilities, ensuring the light fixture is securely installed without damaging the building's foundation.

[0044] Second layer of protection – High-temperature emergency shrapnel support system:

[0045] In response to the risk that metal springs may experience elastic degradation, plastic deformation, or even breakage due to high temperatures (>300℃) during a fire, fireproof spring clips are innovatively introduced as a high-temperature emergency support structure.

[0046] The fireproof spring is made of high-temperature resistant elastic metal material and is pre-installed in the reserved slots on both sides of the ceramic fireproof block. Under normal conditions, it is in a compressed state due to the limitation of the spring mounting bracket.

[0047] When a fire occurs and the temperature rises, the plastic parts of the lamp housing melt or carbonize due to the heat, releasing the restraint on the spring clips. The fireproof spring clips automatically pop out due to their own elasticity, forming a high-temperature support path with the building's fireproof ceiling that is independent of the spring system.

[0048] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0049] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A fireproof downlight, characterized in that, Includes an outer shell (3), a front ring (12) installed on the bottom surface of the outer shell (3), an LED light strip (9) installed on the inner side of the front ring (12), an input wire (1) connected to the LED light strip (9), a ceramic fireproof block (4) provided on the inner side of the outer shell (3), a graphite foam (5) provided between the ceramic fireproof block (4) and the outer shell (3), a fireproof spring (17) installed on the top surface of the ceramic fireproof block (4), the fireproof spring (17) is located inside the outer shell (3) after compression, and two springs (14) are symmetrically provided on the top surface of the outer shell (3).

2. A fireproof downlight according to claim 1, characterized in that, The outer side of the LED light strip (9) is covered with thermally conductive double-sided adhesive (10), which is attached to the inner ring of the front ring (12).

3. A fireproof downlight according to claim 2, characterized in that, The inner side of the LED light strip (9) is provided with a light guide plate (8). The light guide plate (8) is provided with reflective paper (7) and EVA (6) from bottom to top. The EVA (6) is located on the bottom surface of the ceramic fireproof block (4). The bottom surface of the light guide plate (8) is attached with a diffuser plate (11).

4. A fireproof downlight according to claim 1, characterized in that, The fixed end of the fireproof spring clip (17) is located on the ceramic fireproof block (4). The fixed end of the fireproof spring clip (17) is fixed on the ceramic fireproof block (4) by a spring mounting bracket (15) and mounting screws (16). The movable end of the fireproof spring clip (17) is inserted into the relief groove of the ceramic fireproof block (4).

5. A fireproof downlight according to claim 1, characterized in that, The ceramic fireproof block (4) has a limiting groove (401) and the front ring (12) has a limiting pin (1201). The limiting groove (401) and the limiting pin (1201) are positioned opposite each other.

6. A fireproof downlight according to claim 1, characterized in that, The outer casing (3) is fixedly connected to the front ring (12) by fastening screws (2).

7. A fireproof downlight according to claim 1, characterized in that, The other end of the input cable (1) is connected to an LED power module (13).

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