China has made relevant regulations on the installation of power, instrumentation equipment and lighting fixtures in explosive hazardous environments, and the installation must comply with relevant regulations. As a kind of explosion-proof equipment, explosion-proof lamps are often used in various dangerous environments prone to explosion, mainly because of their large number and product types. Light sources such as incandescent lamps, fluorescent lamps, metal halide lamps and LEDs are often used in the production of explosion-proof lighting. Compared with traditional light sources, LED light sources have the advantages of less heat generation, lower energy efficiency, and longer life.
Under normal circumstances, the shell of the explosion-proof led lamp housing is cast from the aluminum alloy material of the typical light metal alloy die-casting alloy code YL113 or ZL102 for casting. In the housing material, the magnesium and titanium content of EPL Ga equipment should be less than 10%, and the content of magnesium, titanium and zirconium should be less than 7.5% by mass. As for the content of magnesium and titanium in the shell material of EPL Gb equipment, it should be less than 7.5%. In order to prevent the shell from corroding and reach the anti-corrosion level of WF1/WF2, it is usually sprayed to improve its corrosion resistance. In order to ensure the strength of the product, the casing must be subjected to a pressure test before leaving the factory. For safety reasons, the water pressure test is generally carried out. The test pressure is 1.5 times the reference pressure, and the duration is not less than 10 seconds. After the test, the shell shall not be damaged and shall not be deformed to affect the explosion-proof performance.
Shell protective cover, power supply cavity, light source cavity, power supply, light source, light transmission cover, protective cover, cable lead-out device, control circuit, junction box, etc. are the components of explosion-proof LED lamps. The more common explosion-proof surface combination methods include plane structure, seam structure and thread structure, etc., and the parameters such as roughness, length, gap and shape tolerance of the explosion-proof surface are designed by selecting a suitable explosion-proof joint surface structure, so that the shell of the explosion-proof lamp can achieve the required explosion-proof performance.
In order to increase the IP protection level to above 65, thereby reducing the entry of water and dust, explosion-proof LED lamps generally use anti-oxidation and anti-corrosion silicone sealing rings to seal the explosion-proof joint surface. At the same time, the high and low temperature alternating test of 28 days of high temperature and 1 day of low temperature should be carried out on the sealing material. The commonly used data is high temperature 95 ~ 150 ℃, low temperature -20 ~ -65 ℃.
In order to improve the impact resistance of explosion-proof lamps, protect the light source components and related electrical components, and at the same time ensure the illuminance and other performance of the light source are stable, explosion-proof LED lamps usually use stainless steel protective nets and high-strength tempered glass to design light-transmitting covers.
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