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Second, LED explosion-proof lights notes
LED explosion-proof lamp working principle and design features
First, the principle of LED explosion-proof lights
The principle of LED explosion-proof lamp is the same as that of explosion-proof lamp. The principle is based on the European standard EN13463-1:2002 "The first part of non-electric equipment for explosive atmospheres: basic methods and requirements". The explosion-proof concept and type of fire protection, flameproof type is to take measures to promise An explosion-proof type that explodes inside and prevents flame propagation is the most commonly used explosion-proof type. LED explosion-proof lamp features, luminous body is a high-power LED module, a wide voltage input driving circuit is provided between the luminous body and the battery, and the wide voltage input driving circuit includes a constant current chip, a constant current chip and a battery to constitute a power module, and LED The module is connected to a constant current chip, and the power module and the LED module are sealed together. The lampshade and the lamp shell are ultrasonically welded. The LED explosion-proof lamp is used in coal mine, petroleum, railway, flood prevention and other industries.
An electrical device with a flameproof enclosure is called a flameproof electrical device. Because this type of explosion-proof lamp housing is generally made of metal materials, it has good heat dissipation, high strength and durability, and is very popular with users. If the explosive gas mixture enters the flameproof enclosure and is ignited, the flameproof enclosure can withstand the explosion pressure of the internal explosive gas mixture and prevent the internal explosion from propagating to the explosive mixture near the enclosure. Moreover, many increased safety explosion-proof lighting components, such as lamp holders, interlock switches, etc., are also flameproof structures. This is a kind of clearance explosion-proof principle, namely the use of metal gap can prevent the propagation of explosion flame and cooling the temperature of the explosion products, to achieve the flame extinguishment and cooling, according to the expansion of the helium explosion of the design of a structure.
1. Before applying the cover, apply a damp cloth (not too wet) to light the light and transparent parts of the light fixture to improve the efficacy of the light fixture. A layer of 204-1 displacement rust preventive oil should be applied thinly on the flameproof joint surface. When the lid is closed, attention should be paid to whether the sealing ring plays a sealing role in the original position.
2. After opening the cover, check whether the flameproof joint surface is intact, whether the rubber seal is hardened or sticky, whether the wire insulation layer is green and carbonized, and whether the insulation and electrical components are deformed and burned. If these problems are found, they should be promptly repaired and replaced.
3. The light source should be turned off in a timely manner to notify the light to be replaced, so as to avoid the ballast and other electrical components being in an abnormal state for a long period of time because the light source cannot be started.
4. If the accumulated water in the cavity of the lamp used in the humid environment should be cleared in time, replace the sealing parts to ensure the protective performance of the enclosure.
5. When you open the lamp cover, you should press the warning board to open the cover after turning off the power.
6. Check whether the transparent parts have been affected by the foreign material, whether the protection network has loosened, detached or corroded. If so, use should be stopped and repaired and replaced in time.
7. Regularly eliminate dust and dirt on the explosion-proof lamp housing to improve the light efficiency and heat dissipation performance of the lamp. The cleaning method can be based on the protection capability of the lamp housing, using water spray (over the shade on the lamp) or using a damp cloth. When cleaning with water spray, the power should be cut off. Never use a dry cloth to scrub the plastic housing (transparent part) of the lamp to prevent static electricity.
8. The sealed part of the lamp should not be frequently disassembled and opened.