Analyze how the LED display is fireproof
With the popularity of LED display screens in indoor and outdoor display, there are more and more fires caused by LED display quality problems and design defects, which poses great danger to the safety of personnel and the economy of customers. As the frequency of accidents increases, people begin to conduct more in-depth analysis: How to prevent fires in practical applications?
LED display causes of fire
LED display screens have fire hazards, mainly due to some shortcomings in several major raw materials. First, the wire. In most display applications, the larger the display per unit area of ​​the display, the greater the amount of power used, and the higher the stability of the wire. Among the many wire products, the use of wire that meets the requirements of the national standard can ensure its safety and stability. Second, the power supply. The UL-certified power supply products are also the choice when selecting the same type of products. The effective conversion rate ensures the safety and stability of the power supply load, and it can work normally even under the hot external environment.
Third, protective materials. The aluminum-plastic panel of the general outdoor display product is aging faster with high temperature and rain and cold heat, so that the rain can easily penetrate into the screen body during a relatively humid climate season, causing a short circuit of the electronic component to cause a fire. In terms of the material of the outer protective structure of the display screen, most of the display products with high fire-proof grades on the market adopt fire-resistant aluminum-plastic composite panels, which have excellent fire resistance and strong fire-retardant properties. Fourth, the plastic kit. The plastic kit is mainly used for the bottom cover of the unit module mask. The main raw material is PC fiberglass material with flame retardant function. It not only has flame retardant function, but also can not be deformed under high and low temperature and long-term use. It will become brittle and cracked. At the same time, it can be combined with the glue with good sealing performance, which can effectively block the rainwater from the external environment from penetrating into the interior and causing a short circuit to cause fire.
In addition to the internal raw materials that affect fire protection, external design such as heat dissipation is also very important. The LED outdoor display works at high temperature, and the power consumption is a big test. If it is a large-area display, it will increase the difficulty of heat dissipation. In the past, large outdoor screens were supplemented with electric fans, and later developed into internal self-contained air-conditioning facilities. In addition, we cannot ignore the factors that are believed to be caused by the post-maintenance project. In short, the fire protection of LED displays needs to be handled with care.
LED display how to do fire prevention work
The quality of the display fire prevention technology is mainly related to the display fireproof raw materials and the box process. The fireproof raw materials mainly include the wire, power supply, external protective structure fireproof material and plastic kit inside the display screen:
1. In most display applications, the larger the unit area display of the display, the greater the power consumption, and the higher the requirements for the power supply stability of the wire. Among the many wire products, the wire can meet the requirements of the national standard to ensure its safety and stability. There are three requirements: the core is the copper wire conductive carrier, the wire core cross-sectional area tolerance is within the standard range value, and the insulation of the wrapped core is rubber. And the flame retardancy reaches the standard. Compared with the general copper-clad aluminum wire core, the wire core cross-sectional area is small, and the insulation rubber grade is not enough, the electric current performance is more stable, and the short circuit condition is not easy to occur;
2. The power supply products that have passed UL certification are also the choice when selecting similar products. The effective conversion rate can ensure the safety and stability of the power supply load, and it can work normally even under the hot environment of external environment.
3. In the material of the external protective structure of the display screen, most of the display products with high fireproof rating on the market adopt fire-resistant aluminum-plastic composite board, which has excellent fire resistance, strong fireproof and flame retardancy, and oxygen aging performance of core material. Also very strong, melting point temperature 135 ° C, decomposition temperature ≥ 300 ° C, environmental performance, low smoke and halogen-free, in line with SGS, flame retardant B-S1, d0, t0, reference standard UL94, GB/8624-2006. The aluminum-plastic panel of the general outdoor display product aging with the high temperature and rain and cold shock, so that the rain can easily penetrate into the screen body during the relatively humid climate season, causing the short circuit of the electronic component to cause fire.
4. There is also an important part of the display fireproof raw material, that is, the plastic kit. The plastic kit is mainly used for the bottom cover of the unit module mask. The main raw material is PC+ glass fiber material with flame retardant function, which not only has flame retardant function. It can not be deformed at high and low temperature and long-term use, and will not become brittle and crack. At the same time, it can be combined with the glue with better sealing performance, which can effectively block the rainwater from the external environment from penetrating into the interior and causing a short circuit to cause fire.
5. In the case that the core raw materials such as lamp beads are not broken, the brightness cannot be increased by increasing the current.
In addition to the internal raw materials will affect the fire prevention effect, the external configuration and design is also very important, but the external configuration mainly involves the heat dissipation in the fire prevention problem. When the display works, the exhaust fan and the air conditioner are configured to cool and cool the inside of the screen body. It is recommended to install 1P air conditioner every 8-10 squares to ensure that the temperature inside the screen maintains a normal temperature. If the air conditioner or exhaust fan is not in place, the heat treatment will be uneven, which may cause safety hazards inside the screen due to temperature increase. At the same time, many LED companies only test the spray waterproofing in the external environment when testing the protection level of the cabinet. The durability and strength of the waterproof effect are yet to be verified, so that after the display product has been used for a while, Water seepage occurs, which is an important reason why outdoor displays are prone to fire or have a short service life. In response to thunderstorms, the screen device arrester is also an essential tool to avoid lightning strikes and burn out the internal components of the screen. It can directly direct lightning into the ground without affecting the screen.
6, the correct installation
Since the LED electronic display is an electronic product, some of its main materials are also combustible, so it is essential to start with "preventing unburned" and using high-quality power supplies, wires, ICs, connecting devices, etc. to be flammable. The device reduces the failure rate and controls the probability of misfire of the led display; technically, it must be installed, instructed, and inspected by professionals in the installation process of the LED display, which can be prevented in the past; The fuel and combustible materials are removed to prevent the led display from being fired due to the surrounding fire hazard; in the after-sales maintenance, the professional display of the led display is checked and inspected by professionals.
7, do a good job in LED display fire certification
To enter the US market, UL48 wire and cable safety regulations and ETL certification are required. In the UK, BS safety certification is required, and Japan needs to achieve PSE mandatory safety certification. Although the Hong Kong Buildings Department has already realized this international problem, it is outdoors. Media buildings (mainly LED display products) have made relevant regulations. All LED display projects that are successfully installed in Hong Kong must pass the flame retardant test of building materials of British Test Center BS476-7.
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