Silica Gel Is Good Heat Resistance, When Using, Should Pay Attention to Choose

A, outdoor lighting designers must consider the outdoor LED lamps and lanterns working environment Outdoor lighting lamps and lanterns LED because working environment is more complex, the temperature, humidity, rainy day, ultraviolet light rain, sand, chemical gas and other natural condition the influence, time grows, can cause LED light failure to serious problems. So eventually on consideration, outdoor lighting designer should be considered in the design of these external environment factors LED to the influence of the outdoor lighting lamps and lanterns. Second, outdoor LED lamps and lanterns in cooling material selection should notice items Shell and radiator design together, used to solve the problem of the fever LED, this way is better, the general selection aluminum or aluminum alloy, copper and copper alloy, and thermal conductive good other alloy. Cooling air convection heat dissipation, high winds have cooled heat and heat pipe heat dissipation, (jet refrigeration cooling is similar to a kind of heat pipe heat dissipation structure, but more complicated. ) Choose what kind of cooling way, to lamps and lanterns has a direct impact on the cost should be taken into account, and design products select the best scheme. The design of the chimney selection is also very important, current use of a transparent organic glass, PC materials, the traditional chimney is transparent glass products, what choose what kind of material with the product class design chimney positioning related, generally speaking, outdoor lamps and lanterns chimney is best traditional glass products, it is making the long life, high-grade lamps and lanterns is the best choice. Use transparent plastic, organic glass and other materials do chimney, make indoor the chimney of lamps and lanterns is good, used for outdoor is limited life, because the sunshine outdoor, ultraviolet ray, sand, chemical gases, between day and night, change and other factors that chimney aging a shortened life span, the second is the pollution is not easy to tie clean, make the chimney transparency reduce affect light output. Three, outdoor LED chips encapsulation technology The current domestic production LED lamps and lanterns (mainly street lamp) mostly using the 1 W LED DuoGe series and parallel to assembly, this kind of method thermal resistance is the advanced packaging technology products high, not easy to make high quality lamps and lanterns. Or using 30 W, 50 W even greater module assembly required to meet the need of power, these LED enclose material useful epoxy encapsulation, useful silica gel package. The difference between is: Epoxy encapsulation heat resistance is poorer, time is long aging. Silica gel encapsulation is good heat resistance, when using, should pay attention to choose. The chip and radiator whole package is better, or use aluminum plate many chip packages again through the phase change materials or cooling silicon grease and radiator are connected, make product thermal resistance than with LED the device assembly product thermal resistance to less one to two way thermal resistance, more benefit at the heat dissipation. Using LED module lamps and lanterns, module base board general for copper substrate, LED lamps it and the connection to the radiator use good phase change materials, or good cooling silicon grease, ensure the quantity of heat of copper substrate in the radiator to go up, such as processing is a bad one heat accumulation cause module chip temperature rise too high, influence LED chips work normally. The author thinks that many chip packages for manufacturing common illumination lamps and lanterns, module package for the occasion of limited space manufacturing compact led lamps and lanterns (such as car Lord of the head lamp lighting). Four, in the outdoor LED lamps and lanterns radiator design research The radiator is led lamps and lanterns is one of the crucial parts, its shape, volume, cooling surface area to design qia the benefits, radiator is too small, led lamp working temperature is too high, influence the luminous efficiency and life expectancy, radiator is too big, the consumption materials increase the cost of product and weight, make the product competition force down. The design appropriate led lamp radiator is very important. The design of the radiator has the following several parts: 1. Clear LED lamp to come loose power. 2. The design of some of the parameters for heat: The specific heat of metal, metal coefficient of thermal conductivity, chip thermal resistance, radiator thermal resistance, the surrounding environment air thermal resistance, etc. 3. Determination by the type of scattered, (natural convection radiator cooling, heat pipe heat dissipation, high winds, and other heat radiator way. ) From cost comparison: Natural convection hot lowest cost, wind cooling medium, heat pipe heat dissipation cost is higher, the jet cooling highest cost. 4. Define LED lamps and lanterns of the highest working temperature permission (environment temperature and lamps and lanterns licensing temperature), 5. The volume of radiator, thermal calculation area. And determine the shape of the radiator. 6. Will the radiator and LED DengZu synthesis complete lamps and lanterns, and electricity work eight hours or more, 39 ℃ in room temperature-40 ℃ under the environment of the temperature of the check lamps and lanterns, see whether meet the cooling requirements for the inspection of calculation is correct, if not meet the conditions of use, is to recount and adjust the parameters. 7. The radiator and chimney sealing to do waterproof, dustproof, chimney and the radiator to cushion the rubber MATS or anti-aging silicone rubber pad, with stainless steel bolts, waterproof, dustproof through it seal above four precautions, then refer to China promulgated the latest outdoor lighting lamps and lanterns technical specifications, as well as the city road lighting design standard, this is in the outdoor lighting designer for the most basic knowledge. Source: Ledknowledges. Org